Merge branch 'mc-1.13.x' into mc-1.14-fabric

Fixes #223

build.gradle

@@ -1,26 +1,17 @@
 buildscript {
-    repositories {
-        jcenter()
-        mavenCentral()
-        maven {
-            name = "forge"
-            url = "http://files.minecraftforge.net/maven"
-        }
-    }
     dependencies {
         classpath 'com.google.code.gson:gson:2.8.1'
-        classpath 'net.minecraftforge.gradle:ForgeGradle:3.0.117'
         classpath 'net.sf.proguard:proguard-gradle:6.1.0beta2'
         classpath 'org.ajoberstar.grgit:grgit-gradle:3.0.0'
     }
 }
 
 plugins {
+    id 'fabric-loom' version '0.2.3-SNAPSHOT'
     id 'com.matthewprenger.cursegradle' version '1.2.0'
     id "com.github.breadmoirai.github-release" version "2.2.4"
 }
 
-apply plugin: 'net.minecraftforge.gradle'
 apply plugin: 'org.ajoberstar.grgit'
 apply plugin: 'maven-publish'
 apply plugin: 'maven'
@@ -31,38 +22,10 @@ group = "org.squiddev"
 archivesBaseName = "cc-tweaked-${mc_version}"
 
 minecraft {
-    runs {
-        client {
-            workingDirectory project.file('run')
-            property 'forge.logging.markers', 'REGISTRIES'
-            property 'forge.logging.console.level', 'debug'
-
-            mods {
-                computercraft {
-                    source sourceSets.main
-                }
-            }
-        }
-
-        server {
-            workingDirectory project.file('run')
-            property 'forge.logging.markers', 'SCAN,REGISTRIES,REGISTRYDUMP'
-            property 'forge.logging.console.level', 'debug'
-
-            mods {
-                computercraft {
-                    source sourceSets.main
-                }
-            }
-        }
-    }
-
-    mappings channel: 'snapshot', version: "${mappings_version}".toString()
-
-    accessTransformer file('src/main/resources/META-INF/accesstransformer.cfg')
 }
 
 repositories {
+    mavenCentral()
     maven {
         name "JEI"
         url  "http://dvs1.progwml6.com/files/maven"
@@ -88,15 +51,15 @@ configurations {
 }
 
 dependencies {
-    minecraft "net.minecraftforge:forge:${mc_version}-${forge_version}"
+    minecraft "com.mojang:minecraft:${mc_version}"
+    mappings "net.fabricmc:yarn:${mc_version}+build.${mappings_version}"
+    modCompile "net.fabricmc:fabric-loader:0.4.8+build.153"
+    modCompile "net.fabricmc.fabric-api:fabric-api:0.3.0+build.175"
 
-    compileOnly fg.deobf("mezz.jei:jei-1.13.2:5.0.0.20:api")
-    // deobfProvided "pl.asie:Charset-Lib:0.5.4.6"
-    // deobfProvided "MCMultiPart2:MCMultiPart:2.5.3"
-
-    runtimeOnly fg.deobf("mezz.jei:jei-1.13.2:5.0.0.20")
+    implementation 'com.google.code.findbugs:jsr305:3.0.2'
 
     shade 'org.squiddev:Cobalt:0.5.0-SNAPSHOT'
+    shade 'javax.vecmath:vecmath:1.5.2'
 
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.1.0'
     testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.1.0'
@@ -107,8 +70,7 @@ dependencies {
 sourceSets {
     main {
         java {
-            exclude 'dan200/computercraft/shared/integration/mcmp'
-            exclude 'dan200/computercraft/shared/integration/charset'
+            exclude 'dan200/computercraft/shared/integration'
         }
     }
 }
@@ -150,8 +112,11 @@ task proguard(type: ProGuardTask, dependsOn: jar) {
     description "Removes unused shadowed classes from the jar"
     group "compact"
 
-    injars jar.archivePath
-    outjars "${jar.archivePath.absolutePath.replace(".jar", "")}-min.jar"
+    afterEvaluate {
+        // Fabric changes the jar's classifier so we to do this after evaluating!
+        injars jar.archivePath
+        outjars "${jar.archivePath.absolutePath.replace(".jar", "")}-min.jar"
+    }
 
     // Add the main runtime jar and all non-shadowed dependencies
     libraryjars "${System.getProperty('java.home')}/lib/rt.jar"
@@ -175,7 +140,7 @@ task proguard(type: ProGuardTask, dependsOn: jar) {
 
     // LWJGL and Apache bundle Java 9 versions, which is great, but rather breaks Proguard
     dontwarn 'module-info'
-    dontwarn 'org.apache.**,org.lwjgl.**'
+    dontwarn 'org.apache.**,org.lwjgl.**,javax.crypto.SecretKey'
 }
 
 task proguardMove(dependsOn: proguard) {
@@ -191,7 +156,7 @@ task proguardMove(dependsOn: proguard) {
     }
 }
 
-
+remapJar.dependsOn proguardMove
 
 processResources {
     inputs.property "version", mod_version
@@ -213,7 +178,7 @@ processResources {
     inputs.property "commithash", hash
 
     from(sourceSets.main.resources.srcDirs) {
-        include 'META-INF/mods.toml'
+        include 'fabric.mod.json'
         include 'data/computercraft/lua/rom/help/credits.txt'
 
         expand 'version': mod_version,
@@ -222,12 +187,12 @@ processResources {
     }
 
     from(sourceSets.main.resources.srcDirs) {
-        exclude 'META-INF/mods.toml'
+        exclude 'fabric.mod.json'
         exclude 'data/computercraft/lua/rom/help/credits.txt'
     }
 }
 
-task compressJson(dependsOn: jar) {
+task compressJson(dependsOn: remapJar) {
     group "compact"
     description "Minifies all JSON files, stripping whitespace"
 
@@ -313,12 +278,22 @@ curseforge {
     apiKey = project.hasProperty('curseForgeApiKey') ? project.curseForgeApiKey : ''
     project {
         id = '282001'
-        releaseType = 'release'
+        addGameVersion '1.14.2'
+        releaseType = 'beta'
         changelog = "Release notes can be found on the GitHub repository (https://github.com/SquidDev-CC/CC-Tweaked/releases/tag/v${mc_version}-${mod_version})."
 
         relations {
             incompatible "computercraft"
+            requiredDependency "fabric"
         }
+        afterEvaluate {
+            mainArtifact(remapJar.output)
+            uploadTask.dependsOn(remapJar)
+        }
+    }
+
+    options {
+        forgeGradleIntegration = false
     }
 }
 
@@ -395,7 +370,7 @@ githubRelease {
 def uploadTasks = ["uploadArchives", "curseforge", "githubRelease"]
 uploadTasks.forEach { tasks.getByName(it).dependsOn checkRelease }
 
-task uploadAll(dependsOn: uploadTasks) {
+task uploadAll(dependsOn: [remapJar] + uploadTasks) {
     group "upload"
     description "Uploads to all repositories (Maven, Curse, GitHub release)"
 }
@@ -408,8 +383,6 @@ test {
 }
 
 gradle.projectsEvaluated {
-    reobfJar.dependsOn proguardMove
-
     tasks.withType(JavaCompile) {
         options.compilerArgs << "-Xlint" << "-Xlint:-processing" // Causes Forge build to fail << "-Werror"
     }

gradle.properties

@@ -2,6 +2,5 @@
 mod_version=1.83.1
 
 # Minecraft properties
-mc_version=1.13.2
-forge_version=25.0.219
-mappings_version=20190530-1.13.2
+mc_version=1.14.2
+mappings_version=2

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.9-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.10-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

settings.gradle

@@ -1 +1,12 @@
-rootProject.name = "cc-tweaked-${mc_version}"
+pluginManagement {
+    repositories {
+        jcenter()
+        maven {
+            name = 'Fabric'
+            url = 'https://maven.fabricmc.net/'
+        }
+        gradlePluginPortal()
+    }
+}
+
+rootProject.name = "cc-tweaked-${mc_version}-fabric"

src/main/java/dan200/computercraft/ComputerCraft.java

@@ -8,10 +8,10 @@ package dan200.computercraft;
 
 import dan200.computercraft.api.filesystem.IMount;
 import dan200.computercraft.api.turtle.event.TurtleAction;
+import dan200.computercraft.client.proxy.ComputerCraftProxyClient;
 import dan200.computercraft.core.apis.AddressPredicate;
 import dan200.computercraft.core.apis.http.websocket.Websocket;
 import dan200.computercraft.core.filesystem.ResourceMount;
-import dan200.computercraft.shared.Config;
 import dan200.computercraft.shared.computer.blocks.BlockComputer;
 import dan200.computercraft.shared.computer.core.ClientComputerRegistry;
 import dan200.computercraft.shared.computer.core.ServerComputerRegistry;
@@ -30,13 +30,15 @@ import dan200.computercraft.shared.peripheral.speaker.BlockSpeaker;
 import dan200.computercraft.shared.pocket.items.ItemPocketComputer;
 import dan200.computercraft.shared.pocket.peripherals.PocketModem;
 import dan200.computercraft.shared.pocket.peripherals.PocketSpeaker;
+import dan200.computercraft.shared.proxy.ComputerCraftProxyCommon;
 import dan200.computercraft.shared.turtle.blocks.BlockTurtle;
 import dan200.computercraft.shared.turtle.items.ItemTurtle;
 import dan200.computercraft.shared.turtle.upgrades.*;
-import net.minecraft.resources.IReloadableResourceManager;
-import net.minecraft.util.ResourceLocation;
-import net.minecraftforge.fml.common.Mod;
-import net.minecraftforge.fml.server.ServerLifecycleHooks;
+import net.fabricmc.api.EnvType;
+import net.fabricmc.api.ModInitializer;
+import net.fabricmc.loader.api.FabricLoader;
+import net.minecraft.resource.ReloadableResourceManager;
+import net.minecraft.util.Identifier;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
@@ -45,8 +47,7 @@ import java.io.InputStream;
 import java.util.EnumSet;
 import java.util.concurrent.TimeUnit;
 
-@Mod( ComputerCraft.MOD_ID )
-public final class ComputerCraft
+public final class ComputerCraft implements ModInitializer
 {
     public static final String MOD_ID = "computercraft";
 
@@ -184,9 +185,22 @@ public final class ComputerCraft
     // Logging
     public static final Logger log = LogManager.getLogger( MOD_ID );
 
+    // Implementation
+    public static ComputerCraft instance;
+
     public ComputerCraft()
     {
-        Config.load();
+        instance = this;
+    }
+
+    @Override
+    public void onInitialize()
+    {
+        ComputerCraftProxyCommon.setup();
+        if( FabricLoader.getInstance().getEnvironmentType() == EnvType.CLIENT )
+        {
+            ComputerCraftProxyClient.setup();
+        }
     }
 
     public static String getVersion()
@@ -196,17 +210,17 @@ public final class ComputerCraft
 
     static IMount createResourceMount( String domain, String subPath )
     {
-        IReloadableResourceManager manager = ServerLifecycleHooks.getCurrentServer().getResourceManager();
+        ReloadableResourceManager manager = ComputerCraftProxyCommon.getServer().getDataManager();
         ResourceMount mount = new ResourceMount( domain, subPath, manager );
         return mount.exists( "" ) ? mount : null;
     }
 
     public static InputStream getResourceFile( String domain, String subPath )
     {
-        IReloadableResourceManager manager = ServerLifecycleHooks.getCurrentServer().getResourceManager();
+        ReloadableResourceManager manager = ComputerCraftProxyCommon.getServer().getDataManager();
         try
         {
-            return manager.getResource( new ResourceLocation( domain, subPath ) ).getInputStream();
+            return manager.getResource( new Identifier( domain, subPath ) ).getInputStream();
         }
         catch( IOException ignored )
         {

src/main/java/dan200/computercraft/ComputerCraftAPIImpl.java

@@ -21,18 +21,19 @@ import dan200.computercraft.api.turtle.ITurtleUpgrade;
 import dan200.computercraft.core.apis.ApiFactories;
 import dan200.computercraft.core.filesystem.FileMount;
 import dan200.computercraft.shared.*;
+import dan200.computercraft.shared.peripheral.modem.wired.TileCable;
+import dan200.computercraft.shared.peripheral.modem.wired.TileWiredModemFull;
 import dan200.computercraft.shared.peripheral.modem.wireless.WirelessNetwork;
 import dan200.computercraft.shared.util.IDAssigner;
-import dan200.computercraft.shared.wired.CapabilityWiredElement;
 import dan200.computercraft.shared.wired.WiredNode;
-import net.minecraft.tileentity.TileEntity;
-import net.minecraft.util.EnumFacing;
+import net.minecraft.block.entity.BlockEntity;
 import net.minecraft.util.math.BlockPos;
-import net.minecraft.world.IBlockReader;
+import net.minecraft.util.math.Direction;
+import net.minecraft.world.BlockView;
 import net.minecraft.world.World;
-import net.minecraftforge.common.util.LazyOptional;
 
 import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
 import java.io.File;
 
 public final class ComputerCraftAPIImpl implements IComputerCraftAPI
@@ -53,7 +54,7 @@ public final class ComputerCraftAPIImpl implements IComputerCraftAPI
     @Override
     public int createUniqueNumberedSaveDir( @Nonnull World world, @Nonnull String parentSubPath )
     {
-        return IDAssigner.getNextId( parentSubPath );
+        return IDAssigner.getNextId( world, parentSubPath );
     }
 
     @Override
@@ -61,7 +62,7 @@ public final class ComputerCraftAPIImpl implements IComputerCraftAPI
     {
         try
         {
-            return new FileMount( new File( IDAssigner.getDir(), subPath ), capacity );
+            return new FileMount( new File( IDAssigner.getDir( world ), subPath ), capacity );
         }
         catch( Exception e )
         {
@@ -94,7 +95,7 @@ public final class ComputerCraftAPIImpl implements IComputerCraftAPI
     }
 
     @Override
-    public int getBundledRedstoneOutput( @Nonnull World world, @Nonnull BlockPos pos, @Nonnull EnumFacing side )
+    public int getBundledRedstoneOutput( @Nonnull World world, @Nonnull BlockPos pos, @Nonnull Direction side )
     {
         return BundledRedstone.getDefaultOutput( world, pos, side );
     }
@@ -131,11 +132,19 @@ public final class ComputerCraftAPIImpl implements IComputerCraftAPI
         return new WiredNode( element );
     }
 
-    @Nonnull
+    @Nullable
     @Override
-    public LazyOptional<IWiredElement> getWiredElementAt( @Nonnull IBlockReader world, @Nonnull BlockPos pos, @Nonnull EnumFacing side )
+    public IWiredElement getWiredElementAt( @Nonnull BlockView world, @Nonnull BlockPos pos, @Nonnull Direction side )
     {
-        TileEntity tile = world.getTileEntity( pos );
-        return tile == null ? LazyOptional.empty() : tile.getCapability( CapabilityWiredElement.CAPABILITY, side );
+        BlockEntity tile = world.getBlockEntity( pos );
+        if( tile instanceof TileCable )
+        {
+            return ((TileCable) tile).getElement( side );
+        }
+        else if( tile instanceof TileWiredModemFull )
+        {
+            return ((TileWiredModemFull) tile).getElement();
+        }
+        return null;
     }
 }

src/main/java/dan200/computercraft/api/AbstractTurtleUpgrade.java

@@ -8,10 +8,10 @@ package dan200.computercraft.api;
 
 import dan200.computercraft.api.turtle.ITurtleUpgrade;
 import dan200.computercraft.api.turtle.TurtleUpgradeType;
+import net.minecraft.item.ItemConvertible;
 import net.minecraft.item.ItemStack;
-import net.minecraft.util.IItemProvider;
-import net.minecraft.util.ResourceLocation;
-import net.minecraft.util.Util;
+import net.minecraft.util.Identifier;
+import net.minecraft.util.SystemUtil;
 
 import javax.annotation.Nonnull;
 
@@ -22,12 +22,12 @@ import javax.annotation.Nonnull;
  */
 public abstract class AbstractTurtleUpgrade implements ITurtleUpgrade
 {
-    private final ResourceLocation id;
+    private final Identifier id;
     private final TurtleUpgradeType type;
     private final String adjective;
     private final ItemStack stack;
 
-    protected AbstractTurtleUpgrade( ResourceLocation id, TurtleUpgradeType type, String adjective, ItemStack stack )
+    protected AbstractTurtleUpgrade( Identifier id, TurtleUpgradeType type, String adjective, ItemStack stack )
     {
         this.id = id;
         this.type = type;
@@ -35,24 +35,24 @@ public abstract class AbstractTurtleUpgrade implements ITurtleUpgrade
         this.stack = stack;
     }
 
-    protected AbstractTurtleUpgrade( ResourceLocation id, TurtleUpgradeType type, String adjective, IItemProvider item )
+    protected AbstractTurtleUpgrade( Identifier id, TurtleUpgradeType type, String adjective, ItemConvertible item )
     {
         this( id, type, adjective, new ItemStack( item ) );
     }
 
-    protected AbstractTurtleUpgrade( ResourceLocation id, TurtleUpgradeType type, ItemStack stack )
+    protected AbstractTurtleUpgrade( Identifier id, TurtleUpgradeType type, ItemStack stack )
     {
-        this( id, type, Util.makeTranslationKey( "upgrade", id ) + ".adjective", stack );
+        this( id, type, SystemUtil.createTranslationKey( "upgrade", id ) + ".adjective", stack );
     }
 
-    protected AbstractTurtleUpgrade( ResourceLocation id, TurtleUpgradeType type, IItemProvider item )
+    protected AbstractTurtleUpgrade( Identifier id, TurtleUpgradeType type, ItemConvertible item )
     {
         this( id, type, new ItemStack( item ) );
     }
 
     @Nonnull
     @Override
-    public final ResourceLocation getUpgradeID()
+    public final Identifier getUpgradeID()
     {
         return id;
     }

src/main/java/dan200/computercraft/api/ComputerCraftAPI.java

@@ -20,11 +20,10 @@ import dan200.computercraft.api.peripheral.IPeripheralProvider;
 import dan200.computercraft.api.pocket.IPocketUpgrade;
 import dan200.computercraft.api.redstone.IBundledRedstoneProvider;
 import dan200.computercraft.api.turtle.ITurtleUpgrade;
-import net.minecraft.util.EnumFacing;
 import net.minecraft.util.math.BlockPos;
-import net.minecraft.world.IBlockReader;
+import net.minecraft.util.math.Direction;
+import net.minecraft.world.BlockView;
 import net.minecraft.world.World;
-import net.minecraftforge.common.util.LazyOptional;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -183,7 +182,7 @@ public final class ComputerCraftAPI
      * If there is no block capable of emitting bundled redstone at the location, -1 will be returned.
      * @see IBundledRedstoneProvider
      */
-    public static int getBundledRedstoneOutput( @Nonnull World world, @Nonnull BlockPos pos, @Nonnull EnumFacing side )
+    public static int getBundledRedstoneOutput( @Nonnull World world, @Nonnull BlockPos pos, @Nonnull Direction side )
     {
         return getInstance().getBundledRedstoneOutput( world, pos, side );
     }
@@ -241,8 +240,8 @@ public final class ComputerCraftAPI
      * @return The element's node
      * @see IWiredElement#getNode()
      */
-    @Nonnull
-    public static LazyOptional<IWiredElement> getWiredElementAt( @Nonnull IBlockReader world, @Nonnull BlockPos pos, @Nonnull EnumFacing side )
+    @Nullable
+    public static IWiredElement getWiredElementAt( @Nonnull BlockView world, @Nonnull BlockPos pos, @Nonnull Direction side )
     {
         return getInstance().getWiredElementAt( world, pos, side );
     }
@@ -284,7 +283,7 @@ public final class ComputerCraftAPI
 
         void registerBundledRedstoneProvider( @Nonnull IBundledRedstoneProvider provider );
 
-        int getBundledRedstoneOutput( @Nonnull World world, @Nonnull BlockPos pos, @Nonnull EnumFacing side );
+        int getBundledRedstoneOutput( @Nonnull World world, @Nonnull BlockPos pos, @Nonnull Direction side );
 
         void registerMediaProvider( @Nonnull IMediaProvider provider );
 
@@ -298,7 +297,7 @@ public final class ComputerCraftAPI
         @Nonnull
         IWiredNode createWiredNodeForElement( @Nonnull IWiredElement element );
 
-        @Nonnull
-        LazyOptional<IWiredElement> getWiredElementAt( @Nonnull IBlockReader world, @Nonnull BlockPos pos, @Nonnull EnumFacing side );
+        @Nullable
+        IWiredElement getWiredElementAt( @Nonnull BlockView world, @Nonnull BlockPos pos, @Nonnull Direction side );
     }
 }

src/main/java/dan200/computercraft/api/media/IMedia.java

@@ -9,7 +9,7 @@ package dan200.computercraft.api.media;
 import dan200.computercraft.api.filesystem.IMount;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
-import net.minecraft.util.SoundEvent;
+import net.minecraft.sound.SoundEvent;
 import net.minecraft.world.World;
 
 import javax.annotation.Nonnull;

src/main/java/dan200/computercraft/api/peripheral/IPeripheralProvider.java

@@ -6,9 +6,9 @@
 
 package dan200.computercraft.api.peripheral;
 
-import net.minecraft.tileentity.TileEntity;
-import net.minecraft.util.EnumFacing;
+import net.minecraft.block.entity.BlockEntity;
 import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.Direction;
 import net.minecraft.world.World;
 
 import javax.annotation.Nonnull;
@@ -17,7 +17,8 @@ import javax.annotation.Nullable;
 /**
  * This interface is used to create peripheral implementations for blocks.
  *
- * If you have a {@link TileEntity} which acts as a peripheral, you may alternatively implement {@link IPeripheralTile}.
+ * If you have a {@link BlockEntity} which acts as a peripheral, you may alternatively implement
+ * {@link IPeripheralTile}.
  *
  * @see dan200.computercraft.api.ComputerCraftAPI#registerPeripheralProvider(IPeripheralProvider)
  */
@@ -34,5 +35,5 @@ public interface IPeripheralProvider
      * @see dan200.computercraft.api.ComputerCraftAPI#registerPeripheralProvider(IPeripheralProvider)
      */
     @Nullable
-    IPeripheral getPeripheral( @Nonnull World world, @Nonnull BlockPos pos, @Nonnull EnumFacing side );
+    IPeripheral getPeripheral( @Nonnull World world, @Nonnull BlockPos pos, @Nonnull Direction side );
 }

src/main/java/dan200/computercraft/api/peripheral/IPeripheralTile.java

@@ -5,15 +5,15 @@
  */
 package dan200.computercraft.api.peripheral;
 
-import net.minecraft.util.EnumFacing;
 import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.Direction;
 import net.minecraft.world.World;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
 /**
- * A {@link net.minecraft.tileentity.TileEntity} which may act as a peripheral.
+ * A {@link net.minecraft.block.entity.BlockEntity} which may act as a peripheral.
  *
  * If you need more complex capabilities (such as handling TEs not belonging to your mod), you should use
  * {@link IPeripheralProvider}.
@@ -25,8 +25,8 @@ public interface IPeripheralTile
      *
      * @param side The side to get the peripheral from.
      * @return A peripheral, or {@code null} if there is not a peripheral here.
-     * @see IPeripheralProvider#getPeripheral(World, BlockPos, EnumFacing)
+     * @see IPeripheralProvider#getPeripheral(World, BlockPos, Direction)
      */
     @Nullable
-    IPeripheral getPeripheral( @Nonnull EnumFacing side );
+    IPeripheral getPeripheral( @Nonnull Direction side );
 }

src/main/java/dan200/computercraft/api/pocket/AbstractPocketUpgrade.java

@@ -6,10 +6,10 @@
 
 package dan200.computercraft.api.pocket;
 
+import net.minecraft.item.ItemConvertible;
 import net.minecraft.item.ItemStack;
-import net.minecraft.util.IItemProvider;
-import net.minecraft.util.ResourceLocation;
-import net.minecraft.util.Util;
+import net.minecraft.util.Identifier;
+import net.minecraft.util.SystemUtil;
 
 import javax.annotation.Nonnull;
 
@@ -20,30 +20,30 @@ import javax.annotation.Nonnull;
  */
 public abstract class AbstractPocketUpgrade implements IPocketUpgrade
 {
-    private final ResourceLocation id;
+    private final Identifier id;
     private final String adjective;
     private final ItemStack stack;
 
-    protected AbstractPocketUpgrade( ResourceLocation id, String adjective, ItemStack stack )
+    protected AbstractPocketUpgrade( Identifier id, String adjective, ItemStack stack )
     {
         this.id = id;
         this.adjective = adjective;
         this.stack = stack;
     }
 
-    protected AbstractPocketUpgrade( ResourceLocation id, String adjective, IItemProvider item )
+    protected AbstractPocketUpgrade( Identifier identifier, String adjective, ItemConvertible item )
     {
-        this( id, adjective, new ItemStack( item ) );
+        this( identifier, adjective, new ItemStack( item ) );
     }
 
-    protected AbstractPocketUpgrade( ResourceLocation id, IItemProvider item )
+    protected AbstractPocketUpgrade( Identifier id, ItemConvertible item )
     {
-        this( id, Util.makeTranslationKey( "upgrade", id ) + ".adjective", new ItemStack( item ) );
+        this( id, SystemUtil.createTranslationKey( "upgrade", id ) + ".adjective", new ItemStack( item ) );
     }
 
     @Nonnull
     @Override
-    public final ResourceLocation getUpgradeID()
+    public final Identifier getUpgradeID()
     {
         return id;
     }

src/main/java/dan200/computercraft/api/pocket/IPocketAccess.java

@@ -8,8 +8,8 @@ package dan200.computercraft.api.pocket;
 
 import dan200.computercraft.api.peripheral.IPeripheral;
 import net.minecraft.entity.Entity;
-import net.minecraft.nbt.NBTTagCompound;
-import net.minecraft.util.ResourceLocation;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.util.Identifier;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -75,7 +75,7 @@ public interface IPocketAccess
      * @see #updateUpgradeNBTData()
      */
     @Nonnull
-    NBTTagCompound getUpgradeNBTData();
+    CompoundTag getUpgradeNBTData();
 
     /**
      * Mark the upgrade-specific NBT as dirty.
@@ -95,5 +95,5 @@ public interface IPocketAccess
      * @return A collection of all upgrade names.
      */
     @Nonnull
-    Map<ResourceLocation, IPeripheral> getUpgrades();
+    Map<Identifier, IPeripheral> getUpgrades();
 }

src/main/java/dan200/computercraft/api/pocket/IPocketUpgrade.java

@@ -10,7 +10,7 @@ import dan200.computercraft.api.ComputerCraftAPI;
 import dan200.computercraft.api.peripheral.IPeripheral;
 import dan200.computercraft.api.turtle.ITurtleUpgrade;
 import net.minecraft.item.ItemStack;
-import net.minecraft.util.ResourceLocation;
+import net.minecraft.util.Identifier;
 import net.minecraft.world.World;
 
 import javax.annotation.Nonnull;
@@ -36,7 +36,7 @@ public interface IPocketUpgrade
      * @see ComputerCraftAPI#registerPocketUpgrade(IPocketUpgrade)
      */
     @Nonnull
-    ResourceLocation getUpgradeID();
+    Identifier getUpgradeID();
 
     /**
      * Return an unlocalised string to describe the type of pocket computer this upgrade provides.

src/main/java/dan200/computercraft/api/redstone/IBundledRedstoneProvider.java

@@ -6,8 +6,8 @@
 
 package dan200.computercraft.api.redstone;
 
-import net.minecraft.util.EnumFacing;
 import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.Direction;
 import net.minecraft.world.World;
 
 import javax.annotation.Nonnull;
@@ -30,5 +30,5 @@ public interface IBundledRedstoneProvider
      * handle this block.
      * @see dan200.computercraft.api.ComputerCraftAPI#registerBundledRedstoneProvider(IBundledRedstoneProvider)
      */
-    int getBundledRedstoneOutput( @Nonnull World world, @Nonnull BlockPos pos, @Nonnull EnumFacing side );
+    int getBundledRedstoneOutput( @Nonnull World world, @Nonnull BlockPos pos, @Nonnull Direction side );
 }

src/main/java/dan200/computercraft/api/turtle/ITurtleAccess.java

@@ -10,13 +10,12 @@ import com.mojang.authlib.GameProfile;
 import dan200.computercraft.api.lua.ILuaContext;
 import dan200.computercraft.api.lua.LuaException;
 import dan200.computercraft.api.peripheral.IPeripheral;
-import net.minecraft.inventory.IInventory;
-import net.minecraft.nbt.NBTTagCompound;
-import net.minecraft.util.EnumFacing;
+import net.minecraft.inventory.Inventory;
+import net.minecraft.nbt.CompoundTag;
 import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.Direction;
 import net.minecraft.util.math.Vec3d;
 import net.minecraft.world.World;
-import net.minecraftforge.items.IItemHandlerModifiable;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -83,10 +82,10 @@ public interface ITurtleAccess
      * Returns the world direction the turtle is currently facing.
      *
      * @return The world direction the turtle is currently facing.
-     * @see #setDirection(EnumFacing)
+     * @see #setDirection(Direction)
      */
     @Nonnull
-    EnumFacing getDirection();
+    Direction getDirection();
 
     /**
      * Set the direction the turtle is facing. Note that this will not play a rotation animation, you will also need to
@@ -95,7 +94,7 @@ public interface ITurtleAccess
      * @param dir The new direction to set. This should be on either the x or z axis (so north, south, east or west).
      * @see #getDirection()
      */
-    void setDirection( @Nonnull EnumFacing dir );
+    void setDirection( @Nonnull Direction dir );
 
     /**
      * Get the currently selected slot in the turtle's inventory.
@@ -147,21 +146,9 @@ public interface ITurtleAccess
      * Get the inventory of this turtle
      *
      * @return This turtle's inventory
-     * @see #getItemHandler()
      */
     @Nonnull
-    IInventory getInventory();
-
-    /**
-     * Get the inventory of this turtle as an {@link IItemHandlerModifiable}.
-     *
-     * @return This turtle's inventory
-     * @see #getInventory()
-     * @see IItemHandlerModifiable
-     * @see net.minecraftforge.items.CapabilityItemHandler#ITEM_HANDLER_CAPABILITY
-     */
-    @Nonnull
-    IItemHandlerModifiable getItemHandler();
+    Inventory getInventory();
 
     /**
      * Determine whether this turtle will require fuel when performing actions.
@@ -290,7 +277,7 @@ public interface ITurtleAccess
      * @see #updateUpgradeNBTData(TurtleSide)
      */
     @Nonnull
-    NBTTagCompound getUpgradeNBTData( @Nullable TurtleSide side );
+    CompoundTag getUpgradeNBTData( @Nullable TurtleSide side );
 
     /**
      * Mark the upgrade-specific data as dirty on a specific side. This is required for the data to be synced to the

src/main/java/dan200/computercraft/api/turtle/ITurtleUpgrade.java

@@ -10,15 +10,13 @@ import dan200.computercraft.api.ComputerCraftAPI;
 import dan200.computercraft.api.peripheral.IPeripheral;
 import dan200.computercraft.api.turtle.event.TurtleAttackEvent;
 import dan200.computercraft.api.turtle.event.TurtleBlockEvent;
-import net.minecraft.client.renderer.model.IBakedModel;
-import net.minecraft.client.renderer.model.ModelResourceLocation;
+import net.fabricmc.api.EnvType;
+import net.fabricmc.api.Environment;
+import net.minecraft.client.render.model.BakedModel;
+import net.minecraft.client.util.ModelIdentifier;
 import net.minecraft.item.ItemStack;
-import net.minecraft.util.EnumFacing;
-import net.minecraft.util.ResourceLocation;
-import net.minecraftforge.api.distmarker.Dist;
-import net.minecraftforge.api.distmarker.OnlyIn;
-import net.minecraftforge.event.entity.player.AttackEntityEvent;
-import net.minecraftforge.event.world.BlockEvent;
+import net.minecraft.util.Identifier;
+import net.minecraft.util.math.Direction;
 import org.apache.commons.lang3.tuple.Pair;
 
 import javax.annotation.Nonnull;
@@ -42,7 +40,7 @@ public interface ITurtleUpgrade
      * @see ComputerCraftAPI#registerTurtleUpgrade(ITurtleUpgrade)
      */
     @Nonnull
-    ResourceLocation getUpgradeID();
+    Identifier getUpgradeID();
 
     /**
      * Return an unlocalised string to describe this type of turtle in turtle item names.
@@ -98,8 +96,8 @@ public interface ITurtleUpgrade
      * Will only be called for Tool turtle. Called when turtle.dig() or turtle.attack() is called
      * by the turtle, and the tool is required to do some work.
      *
-     * Conforming implementations should fire {@link BlockEvent.BreakEvent} and {@link TurtleBlockEvent.Dig}for digging,
-     * {@link AttackEntityEvent} and {@link TurtleAttackEvent} for attacking.
+     * Conforming implementations should fire {@code BlockEvent.BreakEvent} and {@link TurtleBlockEvent.Dig}for digging,
+     * {@code AttackEntityEvent} and {@link TurtleAttackEvent} for attacking.
      *
      * @param turtle    Access to the turtle that the tool resides on.
      * @param side      Which side of the turtle (left or right) the tool resides on.
@@ -113,7 +111,7 @@ public interface ITurtleUpgrade
      * to be called.
      */
     @Nonnull
-    default TurtleCommandResult useTool( @Nonnull ITurtleAccess turtle, @Nonnull TurtleSide side, @Nonnull TurtleVerb verb, @Nonnull EnumFacing direction )
+    default TurtleCommandResult useTool( @Nonnull ITurtleAccess turtle, @Nonnull TurtleSide side, @Nonnull TurtleVerb verb, @Nonnull Direction direction )
     {
         return TurtleCommandResult.failure();
     }
@@ -121,8 +119,8 @@ public interface ITurtleUpgrade
     /**
      * Called to obtain the model to be used when rendering a turtle peripheral.
      *
-     * This can be obtained from {@link net.minecraft.client.renderer.ItemModelMesher#getItemModel(ItemStack)},
-     * {@link net.minecraft.client.renderer.model.ModelManager#getModel(ModelResourceLocation)} or any other
+     * This can be obtained from {@link net.minecraft.client.render.item.ItemModels#getModel(ItemStack)},
+     * {@link net.minecraft.client.render.model.BakedModelManager#getModel(ModelIdentifier)} or any other
      * source.
      *
      * @param turtle Access to the turtle that the upgrade resides on. This will be null when getting item models!
@@ -131,8 +129,8 @@ public interface ITurtleUpgrade
      * a transformation of {@code null} has the same effect as the identify matrix.
      */
     @Nonnull
-    @OnlyIn( Dist.CLIENT )
-    Pair<IBakedModel, Matrix4f> getModel( @Nullable ITurtleAccess turtle, @Nonnull TurtleSide side );
+    @Environment( EnvType.CLIENT )
+    Pair<BakedModel, Matrix4f> getModel( @Nullable ITurtleAccess turtle, @Nonnull TurtleSide side );
 
     /**
      * Called once per tick for each turtle which has the upgrade equipped.

src/main/java/dan200/computercraft/api/turtle/TurtleCommandResult.java

@@ -6,7 +6,7 @@
 
 package dan200.computercraft.api.turtle;
 
-import net.minecraft.util.EnumFacing;
+import net.minecraft.util.math.Direction;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -15,7 +15,7 @@ import javax.annotation.Nullable;
  * Used to indicate the result of executing a turtle command.
  *
  * @see ITurtleCommand#execute(ITurtleAccess)
- * @see ITurtleUpgrade#useTool(ITurtleAccess, TurtleSide, TurtleVerb, EnumFacing)
+ * @see ITurtleUpgrade#useTool(ITurtleAccess, TurtleSide, TurtleVerb, Direction)
  */
 public final class TurtleCommandResult
 {

src/main/java/dan200/computercraft/api/turtle/TurtleVerb.java

@@ -6,14 +6,14 @@
 
 package dan200.computercraft.api.turtle;
 
-import net.minecraft.util.EnumFacing;
+import net.minecraft.util.math.Direction;
 
 /**
  * An enum representing the different actions that an {@link ITurtleUpgrade} of type Tool may be called on to perform by
  * a turtle.
  *
  * @see ITurtleUpgrade#getType()
- * @see ITurtleUpgrade#useTool(ITurtleAccess, TurtleSide, TurtleVerb, EnumFacing)
+ * @see ITurtleUpgrade#useTool(ITurtleAccess, TurtleSide, TurtleVerb, Direction)
  */
 public enum TurtleVerb
 {

src/main/java/dan200/computercraft/api/turtle/event/FakePlayer.java

@@ -0,0 +1,286 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2018. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+
+package dan200.computercraft.api.turtle.event;
+
+import com.mojang.authlib.GameProfile;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.util.concurrent.Future;
+import io.netty.util.concurrent.GenericFutureListener;
+import net.minecraft.block.entity.CommandBlockBlockEntity;
+import net.minecraft.block.entity.SignBlockEntity;
+import net.minecraft.command.arguments.EntityAnchorArgumentType;
+import net.minecraft.container.Container;
+import net.minecraft.container.NameableContainerProvider;
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.damage.DamageSource;
+import net.minecraft.entity.effect.StatusEffectInstance;
+import net.minecraft.entity.passive.HorseBaseEntity;
+import net.minecraft.inventory.Inventory;
+import net.minecraft.item.ItemStack;
+import net.minecraft.network.ClientConnection;
+import net.minecraft.network.NetworkSide;
+import net.minecraft.network.NetworkState;
+import net.minecraft.network.Packet;
+import net.minecraft.network.chat.ChatMessageType;
+import net.minecraft.network.chat.Component;
+import net.minecraft.recipe.Recipe;
+import net.minecraft.server.network.ServerPlayNetworkHandler;
+import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.server.network.ServerPlayerInteractionManager;
+import net.minecraft.server.network.packet.RequestCommandCompletionsC2SPacket;
+import net.minecraft.server.network.packet.VehicleMoveC2SPacket;
+import net.minecraft.server.world.ServerWorld;
+import net.minecraft.sound.SoundCategory;
+import net.minecraft.sound.SoundEvent;
+import net.minecraft.util.DefaultedList;
+import net.minecraft.util.Hand;
+import net.minecraft.util.math.ChunkPos;
+import net.minecraft.util.math.Vec3d;
+import net.minecraft.village.TraderOfferList;
+import net.minecraft.world.GameMode;
+import net.minecraft.world.dimension.DimensionType;
+
+import javax.annotation.Nullable;
+import javax.crypto.SecretKey;
+import java.util.Collection;
+import java.util.OptionalInt;
+
+/**
+ * A wrapper for {@link ServerPlayerEntity} which denotes a "fake" player.
+ *
+ * Please note that this does not implement any of the traditional fake player behaviour. It simply exists to prevent
+ * me passing in normal players.
+ */
+public class FakePlayer extends ServerPlayerEntity
+{
+    public FakePlayer( ServerWorld world, GameProfile gameProfile )
+    {
+        super( world.getServer(), world, gameProfile, new ServerPlayerInteractionManager( world ) );
+        networkHandler = new FakeNetHandler( this );
+    }
+
+    // region Direct networkHandler access
+    @Override
+    public void method_6000() { }
+
+    @Override
+    public void method_6044() { }
+
+    @Override
+    public void tick() { }
+
+    @Override
+    public void method_14226() { }
+
+    @Override
+    public void onDeath( DamageSource damage ) { }
+
+    @Nullable
+    @Override
+    public Entity changeDimension( DimensionType dimension )
+    {
+        return this;
+    }
+
+    @Override
+    public void wakeUp( boolean resetTimer, boolean notify, boolean setSpawn ) { }
+
+    @Override
+    public boolean startRiding( Entity entity, boolean flag )
+    {
+        return false;
+    }
+
+    @Override
+    public void stopRiding() { }
+
+    @Override
+    public void openEditSignScreen( SignBlockEntity tile ) { }
+
+    @Override
+    public OptionalInt openContainer( @Nullable NameableContainerProvider container )
+    {
+        return OptionalInt.empty();
+    }
+
+    @Override
+    public void sendTradeOffers( int id, TraderOfferList list, int level, int experience, boolean levelled ) { }
+
+    @Override
+    public void openHorseInventory( HorseBaseEntity horse, Inventory inventory ) { }
+
+    @Override
+    public void openEditBookScreen( ItemStack stack, Hand hand ) { }
+
+    @Override
+    public void openCommandBlockScreen( CommandBlockBlockEntity block ) { }
+
+    @Override
+    public void onContainerSlotUpdate( Container container, int slot, ItemStack stack ) { }
+
+    @Override
+    public void onContainerRegistered( Container container, DefaultedList<ItemStack> defaultedList ) { }
+
+    @Override
+    public void onContainerPropertyUpdate( Container container, int key, int value ) { }
+
+    @Override
+    public void closeContainer() { }
+
+    @Override
+    public void method_14241() { }
+
+    @Override
+    public void addChatMessage( Component textComponent, boolean status ) { }
+
+    @Override
+    protected void method_6040() { }
+
+    @Override
+    public void lookAt( EntityAnchorArgumentType.EntityAnchor anchor, Vec3d vec3d ) { }
+
+    @Override
+    public void method_14222( EntityAnchorArgumentType.EntityAnchor self, Entity entity, EntityAnchorArgumentType.EntityAnchor target ) { }
+
+    @Override
+    protected void method_6020( StatusEffectInstance statusEffectInstance ) { }
+
+    @Override
+    protected void method_6009( StatusEffectInstance statusEffectInstance, boolean particles ) { }
+
+    @Override
+    protected void method_6129( StatusEffectInstance statusEffectInstance ) { }
+
+    @Override
+    public void requestTeleport( double x, double y, double z ) { }
+
+    @Override
+    public void setGameMode( GameMode gameMode ) { }
+
+    @Override
+    public void sendChatMessage( Component textComponent, ChatMessageType chatMessageType ) { }
+
+    @Override
+    public String getServerBrand()
+    {
+        return "[Fake Player]";
+    }
+
+    @Override
+    public void method_14255( String url, String hash ) { }
+
+    @Override
+    public void onStoppedTracking( Entity entity ) { }
+
+    @Override
+    public void setCameraEntity( Entity entity ) { }
+
+    @Override
+    public void teleport( ServerWorld serverWorld, double x, double y, double z, float pitch, float yaw ) { }
+
+    @Override
+    public void sendInitialChunkPackets( ChunkPos chunkPos, Packet<?> packet, Packet<?> packet2 ) { }
+
+    @Override
+    public void sendUnloadChunkPacket( ChunkPos chunkPos ) { }
+
+    @Override
+    public void playSound( SoundEvent soundEvent, SoundCategory soundCategory, float volume, float pitch ) { }
+    // endregion
+
+    // Indirect
+    @Override
+    public int lockRecipes( Collection<Recipe<?>> recipes )
+    {
+        return 0;
+    }
+
+    @Override
+    public int unlockRecipes( Collection<Recipe<?>> recipes )
+    {
+        return 0;
+    }
+    //
+
+    private static class FakeNetHandler extends ServerPlayNetworkHandler
+    {
+        FakeNetHandler( ServerPlayerEntity player )
+        {
+            super( player.server, new FakeConnection(), player );
+        }
+
+        @Override
+        public void disconnect( Component message ) { }
+
+        @Override
+        public void onRequestCommandCompletions( RequestCommandCompletionsC2SPacket packet ) { }
+
+        @Override
+        public void sendPacket( Packet<?> packet, @Nullable GenericFutureListener<? extends Future<? super Void>> listener ) { }
+
+        @Override
+        public void onVehicleMove( VehicleMoveC2SPacket move ) { }
+    }
+
+    private static class FakeConnection extends ClientConnection
+    {
+        FakeConnection()
+        {
+            super( NetworkSide.CLIENTBOUND );
+        }
+
+        @Override
+        public void channelActive( ChannelHandlerContext active )
+        {
+        }
+
+        @Override
+        public void setState( NetworkState state )
+        {
+        }
+
+        @Override
+        public void disconnect( Component message )
+        {
+        }
+
+        @Override
+        public void exceptionCaught( ChannelHandlerContext context, Throwable err )
+        {
+        }
+
+        @Override
+        protected void method_10770( ChannelHandlerContext context, Packet<?> packet )
+        {
+        }
+
+        @Override
+        public void tick()
+        {
+        }
+
+        @Override
+        public void setupEncryption( SecretKey key )
+        {
+        }
+
+        @Override
+        public void disableAutoRead()
+        {
+        }
+
+        @Override
+        public void setMinCompressedSize( int size )
+        {
+        }
+
+        @Override
+        public void send( Packet<?> packet, @Nullable GenericFutureListener<? extends Future<? super Void>> listener )
+        {
+        }
+    }
+}

src/main/java/dan200/computercraft/api/turtle/event/TurtleActionEvent.java

@@ -8,7 +8,6 @@ package dan200.computercraft.api.turtle.event;
 
 import dan200.computercraft.api.turtle.ITurtleAccess;
 import dan200.computercraft.api.turtle.TurtleCommandResult;
-import net.minecraftforge.eventbus.api.Cancelable;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -17,11 +16,11 @@ import java.util.Objects;
 /**
  * An event fired when a turtle is performing a known action.
  */
-@Cancelable
 public class TurtleActionEvent extends TurtleEvent
 {
     private final TurtleAction action;
     private String failureMessage;
+    private boolean cancelled = false;
 
     public TurtleActionEvent( @Nonnull ITurtleAccess turtle, @Nonnull TurtleAction action )
     {
@@ -45,7 +44,6 @@ public class TurtleActionEvent extends TurtleEvent
      * @see TurtleCommandResult#failure()
      * @deprecated Use {@link #setCanceled(boolean, String)} instead.
      */
-    @Override
     @Deprecated
     public void setCanceled( boolean cancel )
     {
@@ -63,7 +61,7 @@ public class TurtleActionEvent extends TurtleEvent
      */
     public void setCanceled( boolean cancel, @Nullable String failureMessage )
     {
-        super.setCanceled( cancel );
+        this.cancelled = true;
         this.failureMessage = cancel ? failureMessage : null;
     }
 
@@ -79,4 +77,15 @@ public class TurtleActionEvent extends TurtleEvent
     {
         return failureMessage;
     }
+
+    /**
+     * Determine if this event is cancelled
+     *
+     * @return If this event is cancelled
+     * @see #setCanceled(boolean, String)
+     */
+    public boolean isCancelled()
+    {
+        return cancelled;
+    }
 }

src/main/java/dan200/computercraft/api/turtle/event/TurtleAttackEvent.java

@@ -11,9 +11,7 @@ import dan200.computercraft.api.turtle.ITurtleUpgrade;
 import dan200.computercraft.api.turtle.TurtleSide;
 import dan200.computercraft.api.turtle.TurtleVerb;
 import net.minecraft.entity.Entity;
-import net.minecraft.util.EnumFacing;
-import net.minecraftforge.common.util.FakePlayer;
-import net.minecraftforge.event.entity.player.AttackEntityEvent;
+import net.minecraft.util.math.Direction;
 
 import javax.annotation.Nonnull;
 import java.util.Objects;
@@ -21,10 +19,11 @@ import java.util.Objects;
 /**
  * Fired when a turtle attempts to attack an entity.
  *
- * This must be fired by {@link ITurtleUpgrade#useTool(ITurtleAccess, TurtleSide, TurtleVerb, EnumFacing)},
+ * This must be fired by {@link ITurtleUpgrade#useTool(ITurtleAccess, TurtleSide, TurtleVerb, Direction)},
  * as the base {@code turtle.attack()} command does not fire it.
  *
- * Note that such commands should also fire {@link AttackEntityEvent}, so you do not need to listen to both.
+ * Note that such commands should also fire {@link net.fabricmc.fabric.api.event.player.AttackEntityCallback}, so you do
+ * not need to listen to both.
  *
  * @see TurtleAction#ATTACK
  */

src/main/java/dan200/computercraft/api/turtle/event/TurtleBlockEvent.java

@@ -12,13 +12,11 @@ import dan200.computercraft.api.turtle.ITurtleAccess;
 import dan200.computercraft.api.turtle.ITurtleUpgrade;
 import dan200.computercraft.api.turtle.TurtleSide;
 import dan200.computercraft.api.turtle.TurtleVerb;
-import net.minecraft.block.state.IBlockState;
+import net.minecraft.block.BlockState;
 import net.minecraft.item.ItemStack;
-import net.minecraft.util.EnumFacing;
 import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.Direction;
 import net.minecraft.world.World;
-import net.minecraftforge.common.util.FakePlayer;
-import net.minecraftforge.event.world.BlockEvent;
 
 import javax.annotation.Nonnull;
 import java.util.Map;
@@ -75,20 +73,21 @@ public abstract class TurtleBlockEvent extends TurtlePlayerEvent
     /**
      * Fired when a turtle attempts to dig a block.
      *
-     * This must be fired by {@link ITurtleUpgrade#useTool(ITurtleAccess, TurtleSide, TurtleVerb, EnumFacing)},
+     * This must be fired by {@link ITurtleUpgrade#useTool(ITurtleAccess, TurtleSide, TurtleVerb, Direction)},
      * as the base {@code turtle.dig()} command does not fire it.
      *
-     * Note that such commands should also fire {@link BlockEvent.BreakEvent}, so you do not need to listen to both.
+     * Note that such commands should also fire {@link net.fabricmc.fabric.api.event.player.AttackBlockCallback}, so you
+     * do not need to listen to both.
      *
      * @see TurtleAction#DIG
      */
     public static class Dig extends TurtleBlockEvent
     {
-        private final IBlockState block;
+        private final BlockState block;
         private final ITurtleUpgrade upgrade;
         private final TurtleSide side;
 
-        public Dig( @Nonnull ITurtleAccess turtle, @Nonnull FakePlayer player, @Nonnull World world, @Nonnull BlockPos pos, @Nonnull IBlockState block, @Nonnull ITurtleUpgrade upgrade, @Nonnull TurtleSide side )
+        public Dig( @Nonnull ITurtleAccess turtle, @Nonnull FakePlayer player, @Nonnull World world, @Nonnull BlockPos pos, @Nonnull BlockState block, @Nonnull ITurtleUpgrade upgrade, @Nonnull TurtleSide side )
         {
             super( turtle, TurtleAction.DIG, player, world, pos );
 
@@ -106,7 +105,7 @@ public abstract class TurtleBlockEvent extends TurtlePlayerEvent
          * @return The block which is going to be broken.
          */
         @Nonnull
-        public IBlockState getBlock()
+        public BlockState getBlock()
         {
             return block;
         }
@@ -185,10 +184,10 @@ public abstract class TurtleBlockEvent extends TurtlePlayerEvent
      */
     public static class Inspect extends TurtleBlockEvent
     {
-        private final IBlockState state;
+        private final BlockState state;
         private final Map<String, Object> data;
 
-        public Inspect( @Nonnull ITurtleAccess turtle, @Nonnull FakePlayer player, @Nonnull World world, @Nonnull BlockPos pos, @Nonnull IBlockState state, @Nonnull Map<String, Object> data )
+        public Inspect( @Nonnull ITurtleAccess turtle, @Nonnull FakePlayer player, @Nonnull World world, @Nonnull BlockPos pos, @Nonnull BlockState state, @Nonnull Map<String, Object> data )
         {
             super( turtle, TurtleAction.INSPECT, player, world, pos );
 
@@ -204,7 +203,7 @@ public abstract class TurtleBlockEvent extends TurtlePlayerEvent
          * @return The inspected block state.
          */
         @Nonnull
-        public IBlockState getState()
+        public BlockState getState()
         {
             return state;
         }

src/main/java/dan200/computercraft/api/turtle/event/TurtleEvent.java

@@ -6,8 +6,8 @@
 
 package dan200.computercraft.api.turtle.event;
 
+import com.google.common.eventbus.EventBus;
 import dan200.computercraft.api.turtle.ITurtleAccess;
-import net.minecraftforge.eventbus.api.Event;
 
 import javax.annotation.Nonnull;
 import java.util.Objects;
@@ -20,8 +20,10 @@ import java.util.Objects;
  *
  * @see TurtleActionEvent
  */
-public abstract class TurtleEvent extends Event
+public abstract class TurtleEvent
 {
+    public static final EventBus EVENT_BUS = new EventBus();
+
     private final ITurtleAccess turtle;
 
     protected TurtleEvent( @Nonnull ITurtleAccess turtle )
@@ -40,4 +42,10 @@ public abstract class TurtleEvent extends Event
     {
         return turtle;
     }
+
+    public static boolean post( TurtleActionEvent event )
+    {
+        EVENT_BUS.post( event );
+        return event.isCancelled();
+    }
 }

src/main/java/dan200/computercraft/api/turtle/event/TurtleInventoryEvent.java

@@ -7,11 +7,10 @@
 package dan200.computercraft.api.turtle.event;
 
 import dan200.computercraft.api.turtle.ITurtleAccess;
+import net.minecraft.inventory.Inventory;
 import net.minecraft.item.ItemStack;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.World;
-import net.minecraftforge.common.util.FakePlayer;
-import net.minecraftforge.items.IItemHandler;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -22,9 +21,9 @@ import java.util.Objects;
  */
 public abstract class TurtleInventoryEvent extends TurtleBlockEvent
 {
-    private final IItemHandler handler;
+    private final Inventory handler;
 
-    protected TurtleInventoryEvent( @Nonnull ITurtleAccess turtle, @Nonnull TurtleAction action, @Nonnull FakePlayer player, @Nonnull World world, @Nonnull BlockPos pos, @Nullable IItemHandler handler )
+    protected TurtleInventoryEvent( @Nonnull ITurtleAccess turtle, @Nonnull TurtleAction action, @Nonnull FakePlayer player, @Nonnull World world, @Nonnull BlockPos pos, @Nullable Inventory handler )
     {
         super( turtle, action, player, world, pos );
         this.handler = handler;
@@ -36,7 +35,7 @@ public abstract class TurtleInventoryEvent extends TurtleBlockEvent
      * @return The inventory being interacted with, {@code null} if the item will be dropped to/sucked from the world.
      */
     @Nullable
-    public IItemHandler getItemHandler()
+    public Inventory getItemHandler()
     {
         return handler;
     }
@@ -48,7 +47,7 @@ public abstract class TurtleInventoryEvent extends TurtleBlockEvent
      */
     public static class Suck extends TurtleInventoryEvent
     {
-        public Suck( @Nonnull ITurtleAccess turtle, @Nonnull FakePlayer player, @Nonnull World world, @Nonnull BlockPos pos, @Nullable IItemHandler handler )
+        public Suck( @Nonnull ITurtleAccess turtle, @Nonnull FakePlayer player, @Nonnull World world, @Nonnull BlockPos pos, @Nullable Inventory handler )
         {
             super( turtle, TurtleAction.SUCK, player, world, pos, handler );
         }
@@ -63,7 +62,7 @@ public abstract class TurtleInventoryEvent extends TurtleBlockEvent
     {
         private final ItemStack stack;
 
-        public Drop( @Nonnull ITurtleAccess turtle, @Nonnull FakePlayer player, @Nonnull World world, @Nonnull BlockPos pos, @Nullable IItemHandler handler, @Nonnull ItemStack stack )
+        public Drop( @Nonnull ITurtleAccess turtle, @Nonnull FakePlayer player, @Nonnull World world, @Nonnull BlockPos pos, @Nullable Inventory handler, @Nonnull ItemStack stack )
         {
             super( turtle, TurtleAction.DROP, player, world, pos, handler );
 

src/main/java/dan200/computercraft/api/turtle/event/TurtlePlayerEvent.java

@@ -7,7 +7,6 @@
 package dan200.computercraft.api.turtle.event;
 
 import dan200.computercraft.api.turtle.ITurtleAccess;
-import net.minecraftforge.common.util.FakePlayer;
 
 import javax.annotation.Nonnull;
 import java.util.Objects;

src/main/java/dan200/computercraft/client/ClientRegistry.java

@@ -7,36 +7,28 @@
 package dan200.computercraft.client;
 
 import dan200.computercraft.ComputerCraft;
-import dan200.computercraft.client.render.TurtleModelLoader;
 import dan200.computercraft.shared.common.IColouredItem;
 import dan200.computercraft.shared.media.items.ItemDisk;
 import dan200.computercraft.shared.pocket.items.ItemPocketComputer;
 import dan200.computercraft.shared.util.Colour;
-import net.minecraft.client.Minecraft;
-import net.minecraft.client.renderer.model.IBakedModel;
-import net.minecraft.client.renderer.model.IUnbakedModel;
-import net.minecraft.client.renderer.model.ModelResourceLocation;
-import net.minecraft.client.renderer.model.ModelRotation;
-import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
-import net.minecraft.resources.IResourceManager;
-import net.minecraft.util.ResourceLocation;
-import net.minecraftforge.api.distmarker.Dist;
-import net.minecraftforge.client.event.ColorHandlerEvent;
-import net.minecraftforge.client.event.ModelBakeEvent;
-import net.minecraftforge.client.event.ModelRegistryEvent;
-import net.minecraftforge.client.event.TextureStitchEvent;
-import net.minecraftforge.client.model.ModelLoader;
-import net.minecraftforge.client.model.ModelLoaderRegistry;
-import net.minecraftforge.eventbus.api.SubscribeEvent;
-import net.minecraftforge.fml.common.Mod;
+import net.fabricmc.fabric.api.client.render.ColorProviderRegistry;
+import net.fabricmc.fabric.api.event.client.ClientSpriteRegistryCallback;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.render.model.BakedModel;
+import net.minecraft.client.render.model.ModelLoader;
+import net.minecraft.client.render.model.ModelRotation;
+import net.minecraft.client.render.model.UnbakedModel;
+import net.minecraft.client.texture.SpriteAtlasTexture;
+import net.minecraft.client.util.ModelIdentifier;
+import net.minecraft.resource.ResourceManager;
+import net.minecraft.util.Identifier;
 
 import java.util.HashSet;
-import java.util.Map;
+import java.util.function.Consumer;
 
 /**
  * Registers textures and models for items.
  */
-@Mod.EventBusSubscriber( modid = ComputerCraft.MOD_ID, value = Dist.CLIENT )
 public final class ClientRegistry
 {
     private static final String[] EXTRA_MODELS = new String[] {
@@ -70,69 +62,30 @@ public final class ClientRegistry
 
     private ClientRegistry() {}
 
-    @SubscribeEvent
-    public static void registerModels( ModelRegistryEvent event )
+    public static void onTextureStitchEvent( SpriteAtlasTexture atlasTexture, ClientSpriteRegistryCallback.Registry registry )
     {
-        ModelLoaderRegistry.registerLoader( TurtleModelLoader.INSTANCE );
-    }
-
-    @SubscribeEvent
-    public static void onTextureStitchEvent( TextureStitchEvent.Pre event )
-    {
-        IResourceManager manager = Minecraft.getInstance().getResourceManager();
         for( String extra : EXTRA_TEXTURES )
         {
-            event.getMap().registerSprite( manager, new ResourceLocation( ComputerCraft.MOD_ID, extra ) );
+            registry.register( new Identifier( ComputerCraft.MOD_ID, extra ) );
         }
     }
 
-    @SubscribeEvent
-    public static void onModelBakeEvent( ModelBakeEvent event )
+    public static void onModelBakeEvent( ResourceManager manager, Consumer<ModelIdentifier> out )
     {
-        // Load all extra models
-        ModelLoader loader = event.getModelLoader();
-        Map<ModelResourceLocation, IBakedModel> registry = event.getModelRegistry();
-
         for( String model : EXTRA_MODELS )
         {
-            IBakedModel bakedModel = bake( loader, loader.getUnbakedModel( new ResourceLocation( ComputerCraft.MOD_ID, "item/" + model ) ) );
-
-            if( bakedModel != null )
-            {
-                registry.put(
-                    new ModelResourceLocation( new ResourceLocation( ComputerCraft.MOD_ID, model ), "inventory" ),
-                    bakedModel
-                );
-            }
+            out.accept( new ModelIdentifier( new Identifier( ComputerCraft.MOD_ID, model ), "inventory" ) );
         }
-
-        // And load the custom turtle models in too.
-        registry.put(
-            new ModelResourceLocation( new ResourceLocation( ComputerCraft.MOD_ID, "turtle_normal" ), "inventory" ),
-            bake( loader, TurtleModelLoader.INSTANCE.loadModel( new ResourceLocation( ComputerCraft.MOD_ID, "item/turtle_normal" ) ) )
-        );
-
-        registry.put(
-            new ModelResourceLocation( new ResourceLocation( ComputerCraft.MOD_ID, "turtle_advanced" ), "inventory" ),
-            bake( loader, TurtleModelLoader.INSTANCE.loadModel( new ResourceLocation( ComputerCraft.MOD_ID, "item/turtle_advanced" ) ) )
-        );
     }
 
-    @SubscribeEvent
-    public static void onItemColours( ColorHandlerEvent.Item event )
+    public static void onItemColours()
     {
-        if( ComputerCraft.Items.disk == null || ComputerCraft.Blocks.turtleNormal == null )
-        {
-            ComputerCraft.log.warn( "Block/item registration has failed. Skipping registration of item colours." );
-            return;
-        }
-
-        event.getItemColors().register(
+        ColorProviderRegistry.ITEM.register(
             ( stack, layer ) -> layer == 1 ? ((ItemDisk) stack.getItem()).getColour( stack ) : 0xFFFFFF,
             ComputerCraft.Items.disk
         );
 
-        event.getItemColors().register( ( stack, layer ) -> {
+        ColorProviderRegistry.ITEM.register( ( stack, layer ) -> {
             switch( layer )
             {
                 case 0:
@@ -149,20 +102,16 @@ public final class ClientRegistry
         }, ComputerCraft.Items.pocketComputerNormal, ComputerCraft.Items.pocketComputerAdvanced );
 
         // Setup turtle colours
-        event.getItemColors().register(
+        ColorProviderRegistry.ITEM.register(
             ( stack, tintIndex ) -> tintIndex == 0 ? ((IColouredItem) stack.getItem()).getColour( stack ) : 0xFFFFFF,
             ComputerCraft.Blocks.turtleNormal, ComputerCraft.Blocks.turtleAdvanced
         );
     }
 
-    private static IBakedModel bake( ModelLoader loader, IUnbakedModel model )
+    private static BakedModel bake( ModelLoader loader, UnbakedModel model )
     {
-        model.getTextures( loader::getUnbakedModel, new HashSet<>() );
-
-        return model.bake(
-            loader::getUnbakedModel,
-            ModelLoader.defaultTextureGetter(),
-            ModelRotation.X0_Y0, false, DefaultVertexFormats.BLOCK
-        );
+        model.getTextureDependencies( loader::getOrLoadModel, new HashSet<>() );
+        SpriteAtlasTexture sprite = MinecraftClient.getInstance().getSpriteAtlas();
+        return model.bake( loader, sprite::getSprite, ModelRotation.X0_Y0 );
     }
 }

src/main/java/dan200/computercraft/client/ClientTableFormatter.java

@@ -10,13 +10,13 @@ import dan200.computercraft.shared.command.text.ChatHelpers;
 import dan200.computercraft.shared.command.text.TableBuilder;
 import dan200.computercraft.shared.command.text.TableFormatter;
 import it.unimi.dsi.fastutil.ints.Int2IntOpenHashMap;
-import net.minecraft.client.Minecraft;
-import net.minecraft.client.gui.FontRenderer;
-import net.minecraft.client.gui.GuiNewChat;
-import net.minecraft.client.gui.GuiUtilRenderComponents;
+import net.minecraft.ChatFormat;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.font.TextRenderer;
+import net.minecraft.client.gui.hud.ChatHud;
+import net.minecraft.client.util.TextComponentUtil;
+import net.minecraft.network.chat.Component;
 import net.minecraft.util.math.MathHelper;
-import net.minecraft.util.text.ITextComponent;
-import net.minecraft.util.text.TextFormatting;
 import org.apache.commons.lang3.StringUtils;
 
 import javax.annotation.Nullable;
@@ -28,25 +28,25 @@ public class ClientTableFormatter implements TableFormatter
 
     private static Int2IntOpenHashMap lastHeights = new Int2IntOpenHashMap();
 
-    private static FontRenderer renderer()
+    private static TextRenderer renderer()
     {
-        return Minecraft.getInstance().fontRenderer;
+        return MinecraftClient.getInstance().textRenderer;
     }
 
     @Override
     @Nullable
-    public ITextComponent getPadding( ITextComponent component, int width )
+    public Component getPadding( Component component, int width )
     {
         int extraWidth = width - getWidth( component );
         if( extraWidth <= 0 ) return null;
 
-        FontRenderer renderer = renderer();
+        TextRenderer renderer = renderer();
 
-        float spaceWidth = renderer.getStringWidth( " " );
+        float spaceWidth = renderer.getCharWidth( ' ' );
         int spaces = MathHelper.floor( extraWidth / spaceWidth );
         int extra = extraWidth - (int) (spaces * spaceWidth);
 
-        return ChatHelpers.coloured( StringUtils.repeat( ' ', spaces ) + StringUtils.repeat( (char) 712, extra ), TextFormatting.GRAY );
+        return ChatHelpers.coloured( StringUtils.repeat( ' ', spaces ) + StringUtils.repeat( (char) 712, extra ), ChatFormat.GRAY );
     }
 
     @Override
@@ -56,34 +56,34 @@ public class ClientTableFormatter implements TableFormatter
     }
 
     @Override
-    public int getWidth( ITextComponent component )
+    public int getWidth( Component component )
     {
         return renderer().getStringWidth( component.getFormattedText() );
     }
 
     @Override
-    public void writeLine( int id, ITextComponent component )
+    public void writeLine( int id, Component component )
     {
-        Minecraft mc = Minecraft.getInstance();
-        GuiNewChat chat = mc.ingameGUI.getChatGUI();
+        MinecraftClient mc = MinecraftClient.getInstance();
+        ChatHud chat = mc.inGameHud.getChatHud();
 
         // Trim the text if it goes over the allowed length
-        int maxWidth = MathHelper.floor( chat.getChatWidth() / chat.getScale() );
-        List<ITextComponent> list = GuiUtilRenderComponents.splitText( component, maxWidth, mc.fontRenderer, false, false );
-        if( !list.isEmpty() ) chat.printChatMessageWithOptionalDeletion( list.get( 0 ), id );
+        int maxWidth = MathHelper.floor( chat.getWidth() / chat.getScale() );
+        List<Component> list = TextComponentUtil.wrapLines( component, maxWidth, mc.textRenderer, false, false );
+        if( !list.isEmpty() ) chat.addMessage( list.get( 0 ), id );
     }
 
     @Override
     public int display( TableBuilder table )
     {
-        GuiNewChat chat = Minecraft.getInstance().ingameGUI.getChatGUI();
+        ChatHud chat = MinecraftClient.getInstance().inGameHud.getChatHud();
 
         int lastHeight = lastHeights.get( table.getId() );
 
         int height = TableFormatter.super.display( table );
         lastHeights.put( table.getId(), height );
 
-        for( int i = height; i < lastHeight; i++ ) chat.deleteChatLine( i + table.getId() );
+        for( int i = height; i < lastHeight; i++ ) chat.removeMessage( i + table.getId() );
         return height;
     }
 }

src/main/java/dan200/computercraft/client/FrameInfo.java

@@ -6,13 +6,6 @@
 
 package dan200.computercraft.client;
 
-import dan200.computercraft.ComputerCraft;
-import net.minecraftforge.api.distmarker.Dist;
-import net.minecraftforge.eventbus.api.SubscribeEvent;
-import net.minecraftforge.fml.common.Mod;
-import net.minecraftforge.fml.common.gameevent.TickEvent;
-
-@Mod.EventBusSubscriber( modid = ComputerCraft.MOD_ID, value = Dist.CLIENT )
 public final class FrameInfo
 {
     private static int tick;
@@ -32,15 +25,13 @@ public final class FrameInfo
         return renderFrame;
     }
 
-    @SubscribeEvent
-    public static void onTick( TickEvent.ClientTickEvent event )
+    public static void onTick()
     {
-        if( event.phase == TickEvent.Phase.START ) tick++;
+        tick++;
     }
 
-    @SubscribeEvent
-    public static void onRenderTick( TickEvent.RenderTickEvent event )
+    public static void onRenderFrame()
     {
-        if( event.phase == TickEvent.Phase.START ) renderFrame++;
+        renderFrame++;
     }
 }

src/main/java/dan200/computercraft/client/gui/FixedWidthFontRenderer.java

@@ -6,23 +6,23 @@
 
 package dan200.computercraft.client.gui;
 
+import com.mojang.blaze3d.platform.GlStateManager;
 import dan200.computercraft.core.terminal.TextBuffer;
 import dan200.computercraft.shared.util.Palette;
-import net.minecraft.client.Minecraft;
-import net.minecraft.client.renderer.BufferBuilder;
-import net.minecraft.client.renderer.GlStateManager;
-import net.minecraft.client.renderer.Tessellator;
-import net.minecraft.client.renderer.texture.TextureManager;
-import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
-import net.minecraft.util.ResourceLocation;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.render.BufferBuilder;
+import net.minecraft.client.render.Tessellator;
+import net.minecraft.client.render.VertexFormats;
+import net.minecraft.client.texture.TextureManager;
+import net.minecraft.util.Identifier;
 import org.lwjgl.opengl.GL11;
 
 import java.util.Arrays;
 
 public final class FixedWidthFontRenderer
 {
-    private static final ResourceLocation FONT = new ResourceLocation( "computercraft", "textures/gui/term_font.png" );
-    public static final ResourceLocation BACKGROUND = new ResourceLocation( "computercraft", "textures/gui/term_background.png" );
+    private static final Identifier FONT = new Identifier( "computercraft", "textures/gui/term_font.png" );
+    public static final Identifier BACKGROUND = new Identifier( "computercraft", "textures/gui/term_background.png" );
 
     public static final int FONT_HEIGHT = 9;
     public static final int FONT_WIDTH = 6;
@@ -39,7 +39,7 @@ public final class FixedWidthFontRenderer
 
     private FixedWidthFontRenderer()
     {
-        m_textureManager = Minecraft.getInstance().getTextureManager();
+        m_textureManager = MinecraftClient.getInstance().getTextureManager();
     }
 
     private static void greyscaleify( double[] rgb )
@@ -64,12 +64,12 @@ public final class FixedWidthFontRenderer
         int xStart = 1 + column * (FONT_WIDTH + 2);
         int yStart = 1 + row * (FONT_HEIGHT + 2);
 
-        renderer.pos( x, y, 0.0 ).tex( xStart / 256.0, yStart / 256.0 ).color( r, g, b, 1.0f ).endVertex();
-        renderer.pos( x, y + FONT_HEIGHT, 0.0 ).tex( xStart / 256.0, (yStart + FONT_HEIGHT) / 256.0 ).color( r, g, b, 1.0f ).endVertex();
-        renderer.pos( x + FONT_WIDTH, y, 0.0 ).tex( (xStart + FONT_WIDTH) / 256.0, yStart / 256.0 ).color( r, g, b, 1.0f ).endVertex();
-        renderer.pos( x + FONT_WIDTH, y, 0.0 ).tex( (xStart + FONT_WIDTH) / 256.0, yStart / 256.0 ).color( r, g, b, 1.0f ).endVertex();
-        renderer.pos( x, y + FONT_HEIGHT, 0.0 ).tex( xStart / 256.0, (yStart + FONT_HEIGHT) / 256.0 ).color( r, g, b, 1.0f ).endVertex();
-        renderer.pos( x + FONT_WIDTH, y + FONT_HEIGHT, 0.0 ).tex( (xStart + FONT_WIDTH) / 256.0, (yStart + FONT_HEIGHT) / 256.0 ).color( r, g, b, 1.0f ).endVertex();
+        renderer.vertex( x, y, 0.0 ).texture( xStart / 256.0, yStart / 256.0 ).color( r, g, b, 1.0f ).next();
+        renderer.vertex( x, y + FONT_HEIGHT, 0.0 ).texture( xStart / 256.0, (yStart + FONT_HEIGHT) / 256.0 ).color( r, g, b, 1.0f ).next();
+        renderer.vertex( x + FONT_WIDTH, y, 0.0 ).texture( (xStart + FONT_WIDTH) / 256.0, yStart / 256.0 ).color( r, g, b, 1.0f ).next();
+        renderer.vertex( x + FONT_WIDTH, y, 0.0 ).texture( (xStart + FONT_WIDTH) / 256.0, yStart / 256.0 ).color( r, g, b, 1.0f ).next();
+        renderer.vertex( x, y + FONT_HEIGHT, 0.0 ).texture( xStart / 256.0, (yStart + FONT_HEIGHT) / 256.0 ).color( r, g, b, 1.0f ).next();
+        renderer.vertex( x + FONT_WIDTH, y + FONT_HEIGHT, 0.0 ).texture( (xStart + FONT_WIDTH) / 256.0, (yStart + FONT_HEIGHT) / 256.0 ).color( r, g, b, 1.0f ).next();
     }
 
     private void drawQuad( BufferBuilder renderer, double x, double y, int color, double width, Palette p, boolean greyscale )
@@ -83,12 +83,12 @@ public final class FixedWidthFontRenderer
         float g = (float) colour[1];
         float b = (float) colour[2];
 
-        renderer.pos( x, y, 0.0 ).color( r, g, b, 1.0f ).endVertex();
-        renderer.pos( x, y + FONT_HEIGHT, 0.0 ).color( r, g, b, 1.0f ).endVertex();
-        renderer.pos( x + width, y, 0.0 ).color( r, g, b, 1.0f ).endVertex();
-        renderer.pos( x + width, y, 0.0 ).color( r, g, b, 1.0f ).endVertex();
-        renderer.pos( x, y + FONT_HEIGHT, 0.0 ).color( r, g, b, 1.0f ).endVertex();
-        renderer.pos( x + width, y + FONT_HEIGHT, 0.0 ).color( r, g, b, 1.0f ).endVertex();
+        renderer.vertex( x, y, 0.0 ).color( r, g, b, 1.0f ).next();
+        renderer.vertex( x, y + FONT_HEIGHT, 0.0 ).color( r, g, b, 1.0f ).next();
+        renderer.vertex( x + width, y, 0.0 ).color( r, g, b, 1.0f ).next();
+        renderer.vertex( x + width, y, 0.0 ).color( r, g, b, 1.0f ).next();
+        renderer.vertex( x, y + FONT_HEIGHT, 0.0 ).color( r, g, b, 1.0f ).next();
+        renderer.vertex( x + width, y + FONT_HEIGHT, 0.0 ).color( r, g, b, 1.0f ).next();
     }
 
     private boolean isGreyScale( int colour )
@@ -100,8 +100,8 @@ public final class FixedWidthFontRenderer
     {
         // Draw the quads
         Tessellator tessellator = Tessellator.getInstance();
-        BufferBuilder renderer = tessellator.getBuffer();
-        renderer.begin( GL11.GL_TRIANGLES, DefaultVertexFormats.POSITION_COLOR );
+        BufferBuilder renderer = tessellator.getBufferBuilder();
+        renderer.begin( GL11.GL_TRIANGLES, VertexFormats.POSITION_COLOR );
         if( leftMarginSize > 0.0 )
         {
             int colour1 = "0123456789abcdef".indexOf( backgroundColour.charAt( 0 ) );
@@ -129,17 +129,17 @@ public final class FixedWidthFontRenderer
             }
             drawQuad( renderer, x + i * FONT_WIDTH, y, colour, FONT_WIDTH, p, greyScale );
         }
-        GlStateManager.disableTexture2D();
+        GlStateManager.disableTexture();
         tessellator.draw();
-        GlStateManager.enableTexture2D();
+        GlStateManager.enableTexture();
     }
 
     public void drawStringTextPart( int x, int y, TextBuffer s, TextBuffer textColour, boolean greyScale, Palette p )
     {
         // Draw the quads
         Tessellator tessellator = Tessellator.getInstance();
-        BufferBuilder renderer = tessellator.getBuffer();
-        renderer.begin( GL11.GL_TRIANGLES, DefaultVertexFormats.POSITION_TEX_COLOR );
+        BufferBuilder renderer = tessellator.getBufferBuilder();
+        renderer.begin( GL11.GL_TRIANGLES, VertexFormats.POSITION_UV_COLOR );
         for( int i = 0; i < s.length(); i++ )
         {
             // Switch colour
@@ -195,6 +195,6 @@ public final class FixedWidthFontRenderer
     public void bindFont()
     {
         m_textureManager.bindTexture( FONT );
-        GlStateManager.texParameteri( GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_S, GL11.GL_CLAMP );
+        GlStateManager.texParameter( GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_S, GL11.GL_CLAMP );
     }
 }

src/main/java/dan200/computercraft/client/gui/GuiComputer.java

@@ -6,6 +6,7 @@
 
 package dan200.computercraft.client.gui;
 
+import com.mojang.blaze3d.platform.GlStateManager;
 import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.client.gui.widgets.WidgetTerminal;
 import dan200.computercraft.client.gui.widgets.WidgetWrapper;
@@ -13,17 +14,19 @@ import dan200.computercraft.shared.computer.blocks.TileComputer;
 import dan200.computercraft.shared.computer.core.ClientComputer;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
 import dan200.computercraft.shared.computer.inventory.ContainerComputer;
-import net.minecraft.client.gui.inventory.GuiContainer;
-import net.minecraft.client.renderer.GlStateManager;
-import net.minecraft.inventory.Container;
-import net.minecraft.util.ResourceLocation;
+import net.minecraft.client.gui.screen.ingame.AbstractContainerScreen;
+import net.minecraft.container.Container;
+import net.minecraft.entity.player.PlayerInventory;
+import net.minecraft.network.chat.TextComponent;
+import net.minecraft.util.Identifier;
+import org.lwjgl.glfw.GLFW;
 
-public class GuiComputer extends GuiContainer
+public class GuiComputer<T extends Container> extends AbstractContainerScreen<T>
 {
-    public static final ResourceLocation BACKGROUND_NORMAL = new ResourceLocation( ComputerCraft.MOD_ID, "textures/gui/corners_normal.png" );
-    public static final ResourceLocation BACKGROUND_ADVANCED = new ResourceLocation( ComputerCraft.MOD_ID, "textures/gui/corners_advanced.png" );
-    public static final ResourceLocation BACKGROUND_COMMAND = new ResourceLocation( ComputerCraft.MOD_ID, "textures/gui/corners_command.png" );
-    public static final ResourceLocation BACKGROUND_COLOUR = new ResourceLocation( ComputerCraft.MOD_ID, "textures/gui/corners_colour.png" );
+    public static final Identifier BACKGROUND_NORMAL = new Identifier( ComputerCraft.MOD_ID, "textures/gui/corners_normal.png" );
+    public static final Identifier BACKGROUND_ADVANCED = new Identifier( ComputerCraft.MOD_ID, "textures/gui/corners_advanced.png" );
+    public static final Identifier BACKGROUND_COMMAND = new Identifier( ComputerCraft.MOD_ID, "textures/gui/corners_command.png" );
+    public static final Identifier BACKGROUND_COLOUR = new Identifier( ComputerCraft.MOD_ID, "textures/gui/corners_colour.png" );
 
     private final ComputerFamily m_family;
     private final ClientComputer m_computer;
@@ -33,9 +36,11 @@ public class GuiComputer extends GuiContainer
     private WidgetTerminal terminal;
     private WidgetWrapper terminalWrapper;
 
-    public GuiComputer( Container container, ComputerFamily family, ClientComputer computer, int termWidth, int termHeight )
+
+    public GuiComputer( T container, PlayerInventory player, ComputerFamily family, ClientComputer computer, int termWidth, int termHeight )
     {
-        super( container );
+        super( container, player, new TextComponent( "" ) );
+
         m_family = family;
         m_computer = computer;
         m_termWidth = termWidth;
@@ -43,10 +48,10 @@ public class GuiComputer extends GuiContainer
         terminal = null;
     }
 
-    public GuiComputer( TileComputer computer )
+    public static GuiComputer<ContainerComputer> create( int id, TileComputer computer, PlayerInventory player )
     {
-        this(
-            new ContainerComputer( computer ),
+        return new GuiComputer<>(
+            new ContainerComputer( id, computer ), player,
             computer.getFamily(),
             computer.createClientComputer(),
             ComputerCraft.terminalWidth_computer,
@@ -55,32 +60,32 @@ public class GuiComputer extends GuiContainer
     }
 
     @Override
-    protected void initGui()
+    protected void init()
     {
-        mc.keyboardListener.enableRepeatEvents( true );
+        minecraft.keyboard.enableRepeatEvents( true );
 
         int termPxWidth = m_termWidth * FixedWidthFontRenderer.FONT_WIDTH;
         int termPxHeight = m_termHeight * FixedWidthFontRenderer.FONT_HEIGHT;
 
-        xSize = termPxWidth + 4 + 24;
-        ySize = termPxHeight + 4 + 24;
+        containerWidth = termPxWidth + 4 + 24;
+        containerHeight = termPxHeight + 4 + 24;
 
-        super.initGui();
+        super.init();
 
-        terminal = new WidgetTerminal( mc, () -> m_computer, m_termWidth, m_termHeight, 2, 2, 2, 2 );
-        terminalWrapper = new WidgetWrapper( terminal, 2 + 12 + guiLeft, 2 + 12 + guiTop, termPxWidth, termPxHeight );
+        terminal = new WidgetTerminal( minecraft, () -> m_computer, m_termWidth, m_termHeight, 2, 2, 2, 2 );
+        terminalWrapper = new WidgetWrapper( terminal, 2 + 12 + left, 2 + 12 + top, termPxWidth, termPxHeight );
 
         children.add( terminalWrapper );
         setFocused( terminalWrapper );
     }
 
     @Override
-    public void onGuiClosed()
+    public void removed()
     {
-        super.onGuiClosed();
+        super.removed();
         children.remove( terminal );
         terminal = null;
-        mc.keyboardListener.enableRepeatEvents( false );
+        minecraft.keyboard.enableRepeatEvents( false );
     }
 
     @Override
@@ -91,7 +96,7 @@ public class GuiComputer extends GuiContainer
     }
 
     @Override
-    public void drawGuiContainerBackgroundLayer( float partialTicks, int mouseX, int mouseY )
+    public void drawBackground( float partialTicks, int mouseX, int mouseY )
     {
         // Work out where to draw
         int startX = terminalWrapper.getX() - 2;
@@ -108,39 +113,48 @@ public class GuiComputer extends GuiContainer
         {
             case Normal:
             default:
-                mc.getTextureManager().bindTexture( BACKGROUND_NORMAL );
+                minecraft.getTextureManager().bindTexture( BACKGROUND_NORMAL );
                 break;
             case Advanced:
-                mc.getTextureManager().bindTexture( BACKGROUND_ADVANCED );
+                minecraft.getTextureManager().bindTexture( BACKGROUND_ADVANCED );
                 break;
             case Command:
-                mc.getTextureManager().bindTexture( BACKGROUND_COMMAND );
+                minecraft.getTextureManager().bindTexture( BACKGROUND_COMMAND );
                 break;
         }
 
-        drawTexturedModalRect( startX - 12, startY - 12, 12, 28, 12, 12 );
-        drawTexturedModalRect( startX - 12, endY, 12, 40, 12, 12 );
-        drawTexturedModalRect( endX, startY - 12, 24, 28, 12, 12 );
-        drawTexturedModalRect( endX, endY, 24, 40, 12, 12 );
+        blit( startX - 12, startY - 12, 12, 28, 12, 12 );
+        blit( startX - 12, endY, 12, 40, 12, 12 );
+        blit( endX, startY - 12, 24, 28, 12, 12 );
+        blit( endX, endY, 24, 40, 12, 12 );
 
-        drawTexturedModalRect( startX, startY - 12, 0, 0, endX - startX, 12 );
-        drawTexturedModalRect( startX, endY, 0, 12, endX - startX, 12 );
+        blit( startX, startY - 12, 0, 0, endX - startX, 12 );
+        blit( startX, endY, 0, 12, endX - startX, 12 );
 
-        drawTexturedModalRect( startX - 12, startY, 0, 28, 12, endY - startY );
-        drawTexturedModalRect( endX, startY, 36, 28, 12, endY - startY );
+        blit( startX - 12, startY, 0, 28, 12, endY - startY );
+        blit( endX, startY, 36, 28, 12, endY - startY );
     }
 
     @Override
     public void render( int mouseX, int mouseY, float partialTicks )
     {
-        drawDefaultBackground();
+        renderBackground( 0 );
         super.render( mouseX, mouseY, partialTicks );
-        renderHoveredToolTip( mouseX, mouseY );
+        drawMouseoverTooltip( mouseX, mouseY );
+    }
+
+    @Override
+    public boolean keyPressed( int key, int scancode, int modifiers )
+    {
+        // When pressing tab, send it to the computer first
+        return (key == GLFW.GLFW_KEY_TAB && getFocused() == terminalWrapper && terminalWrapper.keyPressed( key, scancode, modifiers ))
+            || super.keyPressed( key, scancode, modifiers );
     }
 
     @Override
     public boolean mouseDragged( double x, double y, int button, double deltaX, double deltaY )
     {
+        // Make sure drag events are propagated to children
         return (getFocused() != null && getFocused().mouseDragged( x, y, button, deltaX, deltaY ))
             || super.mouseDragged( x, y, button, deltaX, deltaY );
     }
@@ -148,6 +162,7 @@ public class GuiComputer extends GuiContainer
     @Override
     public boolean mouseReleased( double x, double y, int button )
     {
+        // Make sure release events are propagated to children
         return (getFocused() != null && getFocused().mouseReleased( x, y, button ))
             || super.mouseReleased( x, y, button );
     }

src/main/java/dan200/computercraft/client/gui/GuiDiskDrive.java

@@ -6,45 +6,44 @@
 
 package dan200.computercraft.client.gui;
 
+import com.mojang.blaze3d.platform.GlStateManager;
+import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.shared.peripheral.diskdrive.ContainerDiskDrive;
-import net.minecraft.client.gui.inventory.GuiContainer;
-import net.minecraft.client.renderer.GlStateManager;
-import net.minecraft.client.resources.I18n;
-import net.minecraft.util.ResourceLocation;
+import net.minecraft.client.gui.screen.ingame.AbstractContainerScreen;
+import net.minecraft.client.resource.language.I18n;
+import net.minecraft.entity.player.PlayerInventory;
+import net.minecraft.util.Identifier;
 
-public class GuiDiskDrive extends GuiContainer
+public class GuiDiskDrive extends AbstractContainerScreen<ContainerDiskDrive>
 {
-    private static final ResourceLocation BACKGROUND = new ResourceLocation( "computercraft", "textures/gui/disk_drive.png" );
+    private static final Identifier BACKGROUND = new Identifier( "computercraft", "textures/gui/disk_drive.png" );
 
-    private final ContainerDiskDrive m_container;
-
-    public GuiDiskDrive( ContainerDiskDrive container )
+    public GuiDiskDrive( ContainerDiskDrive container, PlayerInventory inventory )
     {
-        super( container );
-        m_container = container;
+        super( container, inventory, ComputerCraft.Blocks.diskDrive.getTextComponent() );
     }
 
     @Override
-    protected void drawGuiContainerForegroundLayer( int mouseX, int mouseY )
+    protected void drawForeground( int par1, int par2 )
     {
-        String title = m_container.getDiskDrive().getDisplayName().getString();
-        fontRenderer.drawString( title, (xSize - fontRenderer.getStringWidth( title )) / 2.0f, 6, 0x404040 );
-        fontRenderer.drawString( I18n.format( "container.inventory" ), 8, ySize - 96 + 2, 0x404040 );
+        String title = getTitle().getFormattedText();
+        font.draw( title, (containerWidth - font.getStringWidth( title )) / 2.0f, 6, 0x404040 );
+        font.draw( I18n.translate( "container.inventory" ), 8, (containerHeight - 96) + 2, 0x404040 );
     }
 
     @Override
-    protected void drawGuiContainerBackgroundLayer( float partialTicks, int mouseX, int mouseY )
+    protected void drawBackground( float partialTicks, int mouseX, int mouseY )
     {
         GlStateManager.color4f( 1.0F, 1.0F, 1.0F, 1.0F );
-        mc.getTextureManager().bindTexture( BACKGROUND );
-        drawTexturedModalRect( guiLeft, guiTop, 0, 0, xSize, ySize );
+        minecraft.getTextureManager().bindTexture( BACKGROUND );
+        blit( left, top, 0, 0, containerWidth, containerHeight );
     }
 
     @Override
     public void render( int mouseX, int mouseY, float partialTicks )
     {
-        drawDefaultBackground();
+        renderBackground();
         super.render( mouseX, mouseY, partialTicks );
-        renderHoveredToolTip( mouseX, mouseY );
+        drawMouseoverTooltip( mouseX, mouseY );
     }
 }

src/main/java/dan200/computercraft/client/gui/GuiPocketComputer.java

@@ -10,15 +10,16 @@ import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
 import dan200.computercraft.shared.pocket.inventory.ContainerPocketComputer;
 import dan200.computercraft.shared.pocket.items.ItemPocketComputer;
+import net.minecraft.entity.player.PlayerInventory;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
 
-public class GuiPocketComputer extends GuiComputer
+public class GuiPocketComputer extends GuiComputer<ContainerPocketComputer>
 {
-    public GuiPocketComputer( ContainerPocketComputer container )
+    public GuiPocketComputer( ContainerPocketComputer container, PlayerInventory player )
     {
         super(
-            container,
+            container, player,
             getFamily( container.getStack() ),
             ItemPocketComputer.createClientComputer( container.getStack() ),
             ComputerCraft.terminalWidth_pocketComputer,

src/main/java/dan200/computercraft/client/gui/GuiPrinter.java

@@ -6,47 +6,46 @@
 
 package dan200.computercraft.client.gui;
 
+import com.mojang.blaze3d.platform.GlStateManager;
+import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.shared.peripheral.printer.ContainerPrinter;
-import net.minecraft.client.gui.inventory.GuiContainer;
-import net.minecraft.client.renderer.GlStateManager;
-import net.minecraft.client.resources.I18n;
-import net.minecraft.util.ResourceLocation;
+import net.minecraft.client.gui.screen.ingame.AbstractContainerScreen;
+import net.minecraft.client.resource.language.I18n;
+import net.minecraft.entity.player.PlayerInventory;
+import net.minecraft.util.Identifier;
 
-public class GuiPrinter extends GuiContainer
+public class GuiPrinter extends AbstractContainerScreen<ContainerPrinter>
 {
-    private static final ResourceLocation BACKGROUND = new ResourceLocation( "computercraft", "textures/gui/printer.png" );
+    private static final Identifier BACKGROUND = new Identifier( "computercraft", "textures/gui/printer.png" );
 
-    private final ContainerPrinter container;
-
-    public GuiPrinter( ContainerPrinter container )
+    public GuiPrinter( ContainerPrinter container, PlayerInventory player )
     {
-        super( container );
-        this.container = container;
+        super( container, player, ComputerCraft.Blocks.printer.getTextComponent() );
     }
 
     @Override
-    protected void drawGuiContainerForegroundLayer( int mouseX, int mouseY )
+    protected void drawForeground( int mouseX, int mouseY )
     {
-        String title = container.getPrinter().getDisplayName().getString();
-        fontRenderer.drawString( title, (xSize - fontRenderer.getStringWidth( title )) / 2.0f, 6, 0x404040 );
-        fontRenderer.drawString( I18n.format( "container.inventory" ), 8, ySize - 96 + 2, 0x404040 );
+        String title = getTitle().getFormattedText();
+        font.draw( title, (containerWidth - font.getStringWidth( title )) / 2.0f, 6, 0x404040 );
+        font.draw( I18n.translate( "container.inventory" ), 8, containerHeight - 96 + 2, 0x404040 );
     }
 
     @Override
-    protected void drawGuiContainerBackgroundLayer( float partialTicks, int mouseX, int mouseY )
+    protected void drawBackground( float f, int i, int j )
     {
         GlStateManager.color4f( 1.0F, 1.0F, 1.0F, 1.0F );
-        mc.getTextureManager().bindTexture( BACKGROUND );
-        drawTexturedModalRect( guiLeft, guiTop, 0, 0, xSize, ySize );
+        minecraft.getTextureManager().bindTexture( BACKGROUND );
+        blit( left, top, 0, 0, containerWidth, containerHeight );
 
-        if( container.isPrinting() ) drawTexturedModalRect( guiLeft + 34, guiTop + 21, 176, 0, 25, 45 );
+        if( container.isPrinting() ) blit( left + 34, top + 21, 176, 0, 25, 45 );
     }
 
     @Override
     public void render( int mouseX, int mouseY, float partialTicks )
     {
-        drawDefaultBackground();
+        renderBackground();
         super.render( mouseX, mouseY, partialTicks );
-        renderHoveredToolTip( mouseX, mouseY );
+        drawMouseoverTooltip( mouseX, mouseY );
     }
 }

src/main/java/dan200/computercraft/client/gui/GuiPrintout.java

@@ -6,16 +6,17 @@
 
 package dan200.computercraft.client.gui;
 
+import com.mojang.blaze3d.platform.GlStateManager;
 import dan200.computercraft.core.terminal.TextBuffer;
 import dan200.computercraft.shared.common.ContainerHeldItem;
 import dan200.computercraft.shared.media.items.ItemPrintout;
-import net.minecraft.client.gui.inventory.GuiContainer;
-import net.minecraft.client.renderer.GlStateManager;
+import net.minecraft.client.gui.screen.ingame.AbstractContainerScreen;
+import net.minecraft.entity.player.PlayerInventory;
 import org.lwjgl.glfw.GLFW;
 
 import static dan200.computercraft.client.render.PrintoutRenderer.*;
 
-public class GuiPrintout extends GuiContainer
+public class GuiPrintout extends AbstractContainerScreen<ContainerHeldItem>
 {
     private final boolean m_book;
     private final int m_pages;
@@ -23,11 +24,11 @@ public class GuiPrintout extends GuiContainer
     private final TextBuffer[] m_colours;
     private int m_page;
 
-    public GuiPrintout( ContainerHeldItem container )
+    public GuiPrintout( ContainerHeldItem container, PlayerInventory player )
     {
-        super( container );
+        super( container, player, container.getStack().getDisplayName() );
 
-        ySize = Y_SIZE;
+        containerHeight = Y_SIZE;
 
         String[] text = ItemPrintout.getText( container.getStack() );
         m_text = new TextBuffer[text.length];
@@ -63,9 +64,9 @@ public class GuiPrintout extends GuiContainer
     }
 
     @Override
-    public boolean mouseScrolled( double delta )
+    public boolean mouseScrolled( double x, double y, double delta )
     {
-        if( super.mouseScrolled( delta ) ) return true;
+        if( super.mouseScrolled( x, y, delta ) ) return true;
         if( delta < 0 )
         {
             // Scroll up goes to the next page
@@ -84,25 +85,25 @@ public class GuiPrintout extends GuiContainer
     }
 
     @Override
-    public void drawGuiContainerBackgroundLayer( float partialTicks, int mouseX, int mouseY )
+    public void drawBackground( float partialTicks, int mouseX, int mouseY )
     {
         // Draw the printout
         GlStateManager.color4f( 1.0f, 1.0f, 1.0f, 1.0f );
         GlStateManager.enableDepthTest();
 
-        drawBorder( guiLeft, guiTop, zLevel, m_page, m_pages, m_book );
-        drawText( guiLeft + X_TEXT_MARGIN, guiTop + Y_TEXT_MARGIN, ItemPrintout.LINES_PER_PAGE * m_page, m_text, m_colours );
+        drawBorder( left, top, blitOffset, m_page, m_pages, m_book );
+        drawText( left + X_TEXT_MARGIN, top + Y_TEXT_MARGIN, ItemPrintout.LINES_PER_PAGE * m_page, m_text, m_colours );
     }
 
     @Override
     public void render( int mouseX, int mouseY, float partialTicks )
     {
         // We must take the background further back in order to not overlap with our printed pages.
-        zLevel--;
-        drawDefaultBackground();
-        zLevel++;
+        blitOffset--;
+        renderBackground();
+        blitOffset++;
 
         super.render( mouseX, mouseY, partialTicks );
-        renderHoveredToolTip( mouseX, mouseY );
+        drawMouseoverTooltip( mouseX, mouseY );
     }
 }

src/main/java/dan200/computercraft/client/gui/GuiTurtle.java

@@ -6,6 +6,7 @@
 
 package dan200.computercraft.client.gui;
 
+import com.mojang.blaze3d.platform.GlStateManager;
 import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.client.gui.widgets.WidgetTerminal;
 import dan200.computercraft.client.gui.widgets.WidgetWrapper;
@@ -13,14 +14,15 @@ import dan200.computercraft.shared.computer.core.ClientComputer;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
 import dan200.computercraft.shared.turtle.blocks.TileTurtle;
 import dan200.computercraft.shared.turtle.inventory.ContainerTurtle;
-import net.minecraft.client.gui.inventory.GuiContainer;
-import net.minecraft.client.renderer.GlStateManager;
-import net.minecraft.util.ResourceLocation;
+import net.minecraft.client.gui.screen.ingame.AbstractContainerScreen;
+import net.minecraft.entity.player.PlayerInventory;
+import net.minecraft.util.Identifier;
+import org.lwjgl.glfw.GLFW;
 
-public class GuiTurtle extends GuiContainer
+public class GuiTurtle extends AbstractContainerScreen<ContainerTurtle>
 {
-    private static final ResourceLocation BACKGROUND_NORMAL = new ResourceLocation( "computercraft", "textures/gui/turtle_normal.png" );
-    private static final ResourceLocation BACKGROUND_ADVANCED = new ResourceLocation( "computercraft", "textures/gui/turtle_advanced.png" );
+    private static final Identifier BACKGROUND_NORMAL = new Identifier( "computercraft", "textures/gui/turtle_normal.png" );
+    private static final Identifier BACKGROUND_ADVANCED = new Identifier( "computercraft", "textures/gui/turtle_advanced.png" );
 
     private ContainerTurtle m_container;
 
@@ -30,45 +32,46 @@ public class GuiTurtle extends GuiContainer
     private WidgetTerminal terminal;
     private WidgetWrapper terminalWrapper;
 
-    public GuiTurtle( TileTurtle turtle, ContainerTurtle container )
+    public GuiTurtle( TileTurtle turtle, ContainerTurtle container, PlayerInventory player )
     {
-        super( container );
+        super( container, player, turtle.getDisplayName() );
 
         m_container = container;
         m_family = turtle.getFamily();
         m_computer = turtle.getClientComputer();
 
-        xSize = 254;
-        ySize = 217;
+        containerWidth = 254;
+        containerHeight = 217;
     }
 
     @Override
-    protected void initGui()
+    protected void init()
     {
-        super.initGui();
-        mc.keyboardListener.enableRepeatEvents( true );
+        super.init();
+        minecraft.keyboard.enableRepeatEvents( true );
 
         int termPxWidth = ComputerCraft.terminalWidth_turtle * FixedWidthFontRenderer.FONT_WIDTH;
         int termPxHeight = ComputerCraft.terminalHeight_turtle * FixedWidthFontRenderer.FONT_HEIGHT;
 
         terminal = new WidgetTerminal(
-            mc, () -> m_computer,
+            minecraft, () -> m_computer,
             ComputerCraft.terminalWidth_turtle,
             ComputerCraft.terminalHeight_turtle,
             2, 2, 2, 2
         );
-        terminalWrapper = new WidgetWrapper( terminal, 2 + 8 + guiLeft, 2 + 8 + guiTop, termPxWidth, termPxHeight );
+        terminalWrapper = new WidgetWrapper( terminal, 2 + 8 + left, 2 + 8 + top, termPxWidth, termPxHeight );
 
         children.add( terminalWrapper );
         setFocused( terminalWrapper );
     }
 
     @Override
-    public void onGuiClosed()
+    public void removed()
     {
+        super.removed();
         children.remove( terminal );
         terminal = null;
-        mc.keyboardListener.enableRepeatEvents( false );
+        minecraft.keyboard.enableRepeatEvents( false );
     }
 
     @Override
@@ -87,13 +90,13 @@ public class GuiTurtle extends GuiContainer
             GlStateManager.color4f( 1.0F, 1.0F, 1.0F, 1.0F );
             int slotX = slot % 4;
             int slotY = slot / 4;
-            mc.getTextureManager().bindTexture( advanced ? BACKGROUND_ADVANCED : BACKGROUND_NORMAL );
-            drawTexturedModalRect( guiLeft + m_container.m_turtleInvStartX - 2 + slotX * 18, guiTop + m_container.m_playerInvStartY - 2 + slotY * 18, 0, 217, 24, 24 );
+            minecraft.getTextureManager().bindTexture( advanced ? BACKGROUND_ADVANCED : BACKGROUND_NORMAL );
+            blit( left + m_container.m_turtleInvStartX - 2 + slotX * 18, top + m_container.m_playerInvStartY - 2 + slotY * 18, 0, 217, 24, 24 );
         }
     }
 
     @Override
-    protected void drawGuiContainerBackgroundLayer( float partialTicks, int mouseX, int mouseY )
+    protected void drawBackground( float partialTicks, int mouseX, int mouseY )
     {
         // Draw term
         boolean advanced = m_family == ComputerFamily.Advanced;
@@ -101,8 +104,8 @@ public class GuiTurtle extends GuiContainer
 
         // Draw border/inventory
         GlStateManager.color4f( 1.0F, 1.0F, 1.0F, 1.0F );
-        mc.getTextureManager().bindTexture( advanced ? BACKGROUND_ADVANCED : BACKGROUND_NORMAL );
-        drawTexturedModalRect( guiLeft, guiTop, 0, 0, xSize, ySize );
+        minecraft.getTextureManager().bindTexture( advanced ? BACKGROUND_ADVANCED : BACKGROUND_NORMAL );
+        blit( left, top, 0, 0, containerWidth, containerHeight );
 
         drawSelectionSlot( advanced );
     }
@@ -110,8 +113,29 @@ public class GuiTurtle extends GuiContainer
     @Override
     public void render( int mouseX, int mouseY, float partialTicks )
     {
-        drawDefaultBackground();
+        renderBackground();
         super.render( mouseX, mouseY, partialTicks );
-        renderHoveredToolTip( mouseX, mouseY );
+        drawMouseoverTooltip( mouseX, mouseY );
+    }
+
+    @Override
+    public boolean keyPressed( int key, int scancode, int modifiers )
+    {
+        return (key == GLFW.GLFW_KEY_TAB && getFocused() == terminalWrapper && terminalWrapper.keyPressed( key, scancode, modifiers ))
+            || super.keyPressed( key, scancode, modifiers );
+    }
+
+    @Override
+    public boolean mouseDragged( double x, double y, int button, double deltaX, double deltaY )
+    {
+        return (getFocused() != null && getFocused().mouseDragged( x, y, button, deltaX, deltaY ))
+            || super.mouseDragged( x, y, button, deltaX, deltaY );
+    }
+
+    @Override
+    public boolean mouseReleased( double x, double y, int button )
+    {
+        return (getFocused() != null && getFocused().mouseReleased( x, y, button ))
+            || super.mouseReleased( x, y, button );
     }
 }

src/main/java/dan200/computercraft/client/gui/widgets/WidgetTerminal.java

@@ -6,6 +6,7 @@
 
 package dan200.computercraft.client.gui.widgets;
 
+import com.mojang.blaze3d.platform.GlStateManager;
 import dan200.computercraft.client.FrameInfo;
 import dan200.computercraft.client.gui.FixedWidthFontRenderer;
 import dan200.computercraft.core.terminal.Terminal;
@@ -14,13 +15,12 @@ import dan200.computercraft.shared.computer.core.ClientComputer;
 import dan200.computercraft.shared.computer.core.IComputer;
 import dan200.computercraft.shared.util.Colour;
 import dan200.computercraft.shared.util.Palette;
-import net.minecraft.client.Minecraft;
-import net.minecraft.client.gui.IGuiEventListener;
-import net.minecraft.client.renderer.BufferBuilder;
-import net.minecraft.client.renderer.GlStateManager;
-import net.minecraft.client.renderer.Tessellator;
-import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
-import net.minecraft.util.SharedConstants;
+import net.minecraft.SharedConstants;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.gui.Element;
+import net.minecraft.client.render.BufferBuilder;
+import net.minecraft.client.render.Tessellator;
+import net.minecraft.client.render.VertexFormats;
 import org.lwjgl.glfw.GLFW;
 import org.lwjgl.opengl.GL11;
 
@@ -29,16 +29,18 @@ import java.util.function.Supplier;
 
 import static dan200.computercraft.client.gui.FixedWidthFontRenderer.BACKGROUND;
 
-public class WidgetTerminal implements IGuiEventListener
+public class WidgetTerminal implements Element
 {
     private static final float TERMINATE_TIME = 0.5f;
 
-    private final Minecraft client;
+    private final MinecraftClient minecraft;
 
     private final Supplier<ClientComputer> computer;
     private final int termWidth;
     private final int termHeight;
 
+    private boolean focused;
+
     private float terminateTimer = -1;
     private float rebootTimer = -1;
     private float shutdownTimer = -1;
@@ -54,9 +56,9 @@ public class WidgetTerminal implements IGuiEventListener
 
     private final BitSet keysDown = new BitSet( 256 );
 
-    public WidgetTerminal( Minecraft client, Supplier<ClientComputer> computer, int termWidth, int termHeight, int leftMargin, int rightMargin, int topMargin, int bottomMargin )
+    public WidgetTerminal( MinecraftClient minecraft, Supplier<ClientComputer> computer, int termWidth, int termHeight, int leftMargin, int rightMargin, int topMargin, int bottomMargin )
     {
-        this.client = client;
+        this.minecraft = minecraft;
         this.computer = computer;
         this.termWidth = termWidth;
         this.termHeight = termHeight;
@@ -98,7 +100,7 @@ public class WidgetTerminal implements IGuiEventListener
 
                 case GLFW.GLFW_KEY_V:
                     // Ctrl+V for paste
-                    String clipboard = client.keyboardListener.getClipboardString();
+                    String clipboard = minecraft.keyboard.getClipboard();
                     if( clipboard != null )
                     {
                         // Clip to the first occurrence of \r or \n
@@ -118,7 +120,7 @@ public class WidgetTerminal implements IGuiEventListener
                         }
 
                         // Filter the string
-                        clipboard = SharedConstants.filterAllowedCharacters( clipboard );
+                        clipboard = SharedConstants.stripInvalidChars( clipboard );
                         if( !clipboard.isEmpty() )
                         {
                             // Clip to 512 characters and queue the event
@@ -250,14 +252,23 @@ public class WidgetTerminal implements IGuiEventListener
     }
 
     @Override
-    public boolean mouseScrolled( double delta )
+    public boolean mouseScrolled( double mouseX, double mouseY, double delta )
     {
         ClientComputer computer = this.computer.get();
-        if( computer == null || !computer.isColour() ) return false;
+        if( computer == null || !computer.isColour() || delta == 0 ) return false;
 
-        if( lastMouseX >= 0 && lastMouseY >= 0 && delta != 0 )
+        Terminal term = computer.getTerminal();
+        if( term != null )
         {
-            queueEvent( "mouse_scroll", delta < 0 ? 1 : -1, lastMouseX + 1, lastMouseY + 1 );
+            int charX = (int) (mouseX / FixedWidthFontRenderer.FONT_WIDTH);
+            int charY = (int) (mouseY / FixedWidthFontRenderer.FONT_HEIGHT);
+            charX = Math.min( Math.max( charX, 0 ), term.getWidth() - 1 );
+            charY = Math.min( Math.max( charY, 0 ), term.getHeight() - 1 );
+
+            computer.mouseScroll( delta < 0 ? 1 : -1, charX + 1, charY + 1 );
+
+            lastMouseX = charX;
+            lastMouseY = charY;
         }
 
         return true;
@@ -284,9 +295,9 @@ public class WidgetTerminal implements IGuiEventListener
     }
 
     @Override
-    public void focusChanged( boolean focused )
+    public boolean changeFocus( boolean reverse )
     {
-        if( !focused )
+        if( focused )
         {
             // When blurring, we should make all keys go up
             for( int key = 0; key < keysDown.size(); key++ )
@@ -305,6 +316,9 @@ public class WidgetTerminal implements IGuiEventListener
 
             shutdownTimer = terminateTimer = rebootTimer = -1;
         }
+
+        focused = !focused;
+        return true;
     }
 
     public void draw( int originX, int originY )
@@ -384,15 +398,15 @@ public class WidgetTerminal implements IGuiEventListener
                     int width = termWidth * FixedWidthFontRenderer.FONT_WIDTH + leftMargin + rightMargin;
                     int height = termHeight * FixedWidthFontRenderer.FONT_HEIGHT + topMargin + bottomMargin;
 
-                    client.getTextureManager().bindTexture( BACKGROUND );
+                    minecraft.getTextureManager().bindTexture( BACKGROUND );
 
                     Tessellator tesslector = Tessellator.getInstance();
-                    BufferBuilder buffer = tesslector.getBuffer();
-                    buffer.begin( GL11.GL_QUADS, DefaultVertexFormats.POSITION_TEX );
-                    buffer.pos( x, y + height, 0 ).tex( 0 / 256.0, height / 256.0 ).endVertex();
-                    buffer.pos( x + width, y + height, 0 ).tex( width / 256.0, height / 256.0 ).endVertex();
-                    buffer.pos( x + width, y, 0 ).tex( width / 256.0, 0 / 256.0 ).endVertex();
-                    buffer.pos( x, y, 0 ).tex( 0 / 256.0, 0 / 256.0 ).endVertex();
+                    BufferBuilder buffer = tesslector.getBufferBuilder();
+                    buffer.begin( GL11.GL_QUADS, VertexFormats.POSITION_UV );
+                    buffer.vertex( x, y + height, 0 ).texture( 0 / 256.0, height / 256.0 ).next();
+                    buffer.vertex( x + width, y + height, 0 ).texture( width / 256.0, height / 256.0 ).next();
+                    buffer.vertex( x + width, y, 0 ).texture( width / 256.0, 0 / 256.0 ).next();
+                    buffer.vertex( x, y, 0 ).texture( 0 / 256.0, 0 / 256.0 ).next();
                     tesslector.draw();
                 }
                 finally

src/main/java/dan200/computercraft/client/gui/widgets/WidgetWrapper.java

@@ -6,17 +6,17 @@
 
 package dan200.computercraft.client.gui.widgets;
 
-import net.minecraft.client.gui.IGuiEventListener;
+import net.minecraft.client.gui.Element;
 
-public class WidgetWrapper implements IGuiEventListener
+public class WidgetWrapper implements Element
 {
-    private final IGuiEventListener listener;
+    private final Element listener;
     private final int x;
     private final int y;
     private final int width;
     private final int height;
 
-    public WidgetWrapper( IGuiEventListener listener, int x, int y, int width, int height )
+    public WidgetWrapper( Element listener, int x, int y, int width, int height )
     {
         this.listener = listener;
         this.x = x;
@@ -26,15 +26,16 @@ public class WidgetWrapper implements IGuiEventListener
     }
 
     @Override
-    public void focusChanged( boolean b )
+    public void mouseMoved( double x, double y )
     {
-        listener.focusChanged( b );
+        double dx = x - this.x, dy = y - this.y;
+        if( dx >= 0 && dx < width && dy >= 0 && dy < height ) listener.mouseMoved( dx, dy );
     }
 
     @Override
-    public boolean canFocus()
+    public boolean changeFocus( boolean reverse )
     {
-        return listener.canFocus();
+        return listener.changeFocus( reverse );
     }
 
     @Override
@@ -59,9 +60,10 @@ public class WidgetWrapper implements IGuiEventListener
     }
 
     @Override
-    public boolean mouseScrolled( double delta )
+    public boolean mouseScrolled( double x, double y, double delta )
     {
-        return listener.mouseScrolled( delta );
+        double dx = x - this.x, dy = y - this.y;
+        return dx >= 0 && dx < width && dy >= 0 && dy < height && listener.mouseScrolled( dx, dy, delta );
     }
 
     @Override
@@ -101,4 +103,11 @@ public class WidgetWrapper implements IGuiEventListener
     {
         return height;
     }
+
+    @Override
+    public boolean isMouseOver( double x, double y )
+    {
+        double dx = x - this.x, dy = y - this.y;
+        return dx >= 0 && dx < width && dy >= 0 && dy < height;
+    }
 }

src/main/java/dan200/computercraft/client/proxy/ComputerCraftProxyClient.java

@@ -7,80 +7,78 @@
 package dan200.computercraft.client.proxy;
 
 import dan200.computercraft.ComputerCraft;
+import dan200.computercraft.client.ClientRegistry;
+import dan200.computercraft.client.FrameInfo;
 import dan200.computercraft.client.gui.*;
 import dan200.computercraft.client.render.TileEntityCableRenderer;
 import dan200.computercraft.client.render.TileEntityMonitorRenderer;
 import dan200.computercraft.client.render.TileEntityTurtleRenderer;
+import dan200.computercraft.client.render.TurtleModelLoader;
 import dan200.computercraft.shared.computer.blocks.TileComputer;
 import dan200.computercraft.shared.computer.core.ClientComputer;
 import dan200.computercraft.shared.computer.inventory.ContainerViewComputer;
 import dan200.computercraft.shared.network.container.*;
 import dan200.computercraft.shared.peripheral.modem.wired.TileCable;
-import dan200.computercraft.shared.peripheral.monitor.ClientMonitor;
 import dan200.computercraft.shared.peripheral.monitor.TileMonitor;
 import dan200.computercraft.shared.turtle.blocks.TileTurtle;
 import dan200.computercraft.shared.turtle.inventory.ContainerTurtle;
-import net.minecraft.client.Minecraft;
-import net.minecraft.client.gui.inventory.GuiContainer;
-import net.minecraft.entity.player.EntityPlayer;
-import net.minecraftforge.api.distmarker.Dist;
-import net.minecraftforge.event.world.WorldEvent;
-import net.minecraftforge.eventbus.api.SubscribeEvent;
-import net.minecraftforge.fml.ExtensionPoint;
-import net.minecraftforge.fml.ModLoadingContext;
-import net.minecraftforge.fml.client.registry.ClientRegistry;
-import net.minecraftforge.fml.common.Mod;
-import net.minecraftforge.fml.event.lifecycle.FMLClientSetupEvent;
+import net.fabricmc.fabric.api.client.model.ModelLoadingRegistry;
+import net.fabricmc.fabric.api.client.render.BlockEntityRendererRegistry;
+import net.fabricmc.fabric.api.event.client.ClientSpriteRegistryCallback;
+import net.fabricmc.fabric.api.event.client.ClientTickCallback;
+import net.minecraft.container.ArrayPropertyDelegate;
+import net.minecraft.inventory.BasicInventory;
 
-import java.util.function.BiFunction;
-
-@Mod.EventBusSubscriber( modid = ComputerCraft.MOD_ID, value = Dist.CLIENT, bus = Mod.EventBusSubscriber.Bus.MOD )
 public final class ComputerCraftProxyClient
 {
-    @SubscribeEvent
-    public static void setupClient( FMLClientSetupEvent event )
+    public static void setup()
     {
         registerContainers();
 
         // Setup TESRs
-        ClientRegistry.bindTileEntitySpecialRenderer( TileMonitor.class, new TileEntityMonitorRenderer() );
-        ClientRegistry.bindTileEntitySpecialRenderer( TileCable.class, new TileEntityCableRenderer() );
-        ClientRegistry.bindTileEntitySpecialRenderer( TileTurtle.class, new TileEntityTurtleRenderer() );
+        BlockEntityRendererRegistry.INSTANCE.register( TileMonitor.class, new TileEntityMonitorRenderer() );
+        BlockEntityRendererRegistry.INSTANCE.register( TileCable.class, new TileEntityCableRenderer() );
+        BlockEntityRendererRegistry.INSTANCE.register( TileTurtle.class, new TileEntityTurtleRenderer() );
+
+        ClientRegistry.onItemColours();
+        ClientSpriteRegistryCallback.registerBlockAtlas( ClientRegistry::onTextureStitchEvent );
+        ModelLoadingRegistry.INSTANCE.registerAppender( ClientRegistry::onModelBakeEvent );
+        ModelLoadingRegistry.INSTANCE.registerResourceProvider( loader -> ( name, context ) ->
+            TurtleModelLoader.INSTANCE.accepts( name ) ? TurtleModelLoader.INSTANCE.loadModel( name ) : null
+        );
+
+        ClientTickCallback.EVENT.register( client -> FrameInfo.onTick() );
     }
 
     private static void registerContainers()
     {
-        ContainerType.registerGui( TileEntityContainerType::computer, ( packet, player ) ->
-            new GuiComputer( (TileComputer) packet.getTileEntity( player ) ) );
+        ContainerType.registerGui( TileEntityContainerType::computer, ( id, packet, player ) ->
+            GuiComputer.create( id, (TileComputer) packet.getTileEntity( player ), player.inventory ) );
         ContainerType.registerGui( TileEntityContainerType::diskDrive, GuiDiskDrive::new );
         ContainerType.registerGui( TileEntityContainerType::printer, GuiPrinter::new );
-        ContainerType.registerGui( TileEntityContainerType::turtle, ( packet, player ) -> {
+        ContainerType.registerGui( TileEntityContainerType::turtle, ( id, packet, player ) -> {
             TileTurtle turtle = (TileTurtle) packet.getTileEntity( player );
-            return new GuiTurtle( turtle, new ContainerTurtle( player.inventory, turtle.getAccess(), turtle.getClientComputer() ) );
+            return new GuiTurtle( turtle,
+                new ContainerTurtle( id, player.inventory, new BasicInventory( TileTurtle.INVENTORY_SIZE ), new ArrayPropertyDelegate( 1 ) ),
+                player.inventory
+            );
         } );
 
         ContainerType.registerGui( PocketComputerContainerType::new, GuiPocketComputer::new );
         ContainerType.registerGui( PrintoutContainerType::new, GuiPrintout::new );
-        ContainerType.registerGui( ViewComputerContainerType::new, ( packet, player ) -> {
+        ContainerType.registerGui( ViewComputerContainerType::new, ( id, packet, player ) -> {
             ClientComputer computer = ComputerCraft.clientComputerRegistry.get( packet.instanceId );
             if( computer == null )
             {
                 ComputerCraft.clientComputerRegistry.add( packet.instanceId, computer = new ClientComputer( packet.instanceId ) );
             }
 
-            ContainerViewComputer container = new ContainerViewComputer( computer );
-            return new GuiComputer( container, packet.family, computer, packet.width, packet.height );
-        } );
-
-        ModLoadingContext.get().registerExtensionPoint( ExtensionPoint.GUIFACTORY, () -> packet -> {
-            ContainerType<?> type = ContainerType.factories.get( packet.getId() ).get();
-            if( packet.getAdditionalData() != null ) type.fromBytes( packet.getAdditionalData() );
-            @SuppressWarnings( "unchecked" )
-            BiFunction<ContainerType<?>, EntityPlayer, GuiContainer> factory = (BiFunction<ContainerType<?>, EntityPlayer, GuiContainer>) ContainerType.guiFactories.get( packet.getId() );
-            return factory.apply( type, Minecraft.getInstance().player );
+            ContainerViewComputer container = new ContainerViewComputer( id, computer );
+            return new GuiComputer<>( container, player.inventory, packet.family, computer, packet.width, packet.height );
         } );
     }
 
+    /*
     @Mod.EventBusSubscriber( modid = ComputerCraft.MOD_ID, value = Dist.CLIENT )
     public static final class ForgeHandlers
     {
@@ -93,4 +91,5 @@ public final class ComputerCraftProxyClient
             }
         }
     }
+    */
 }

src/main/java/dan200/computercraft/client/render/CableHighlightRenderer.java

@@ -6,26 +6,23 @@
 
 package dan200.computercraft.client.render;
 
+import com.mojang.blaze3d.platform.GlStateManager;
 import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.shared.peripheral.modem.wired.BlockCable;
 import dan200.computercraft.shared.peripheral.modem.wired.CableShapes;
 import dan200.computercraft.shared.util.WorldUtil;
-import net.minecraft.block.state.IBlockState;
-import net.minecraft.client.Minecraft;
-import net.minecraft.client.renderer.GlStateManager;
-import net.minecraft.client.renderer.WorldRenderer;
-import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.block.BlockState;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.render.Camera;
+import net.minecraft.client.render.WorldRenderer;
+import net.minecraft.entity.Entity;
+import net.minecraft.util.hit.BlockHitResult;
+import net.minecraft.util.hit.HitResult;
 import net.minecraft.util.math.BlockPos;
-import net.minecraft.util.math.RayTraceResult;
-import net.minecraft.util.math.shapes.VoxelShape;
+import net.minecraft.util.shape.VoxelShape;
 import net.minecraft.world.World;
-import net.minecraftforge.api.distmarker.Dist;
-import net.minecraftforge.client.event.DrawBlockHighlightEvent;
-import net.minecraftforge.eventbus.api.SubscribeEvent;
-import net.minecraftforge.fml.common.Mod;
 import org.lwjgl.opengl.GL11;
 
-@Mod.EventBusSubscriber( modid = ComputerCraft.MOD_ID, value = Dist.CLIENT )
 public final class CableHighlightRenderer
 {
     private CableHighlightRenderer()
@@ -35,54 +32,43 @@ public final class CableHighlightRenderer
     /**
      * Draw an outline for a specific part of a cable "Multipart".
      *
-     * @param event The event to observe
-     * @see WorldRenderer#drawSelectionBox(EntityPlayer, RayTraceResult, int, float)
+     * @see WorldRenderer#drawHighlightedBlockOutline(Entity, HitResult, int, float)
      */
-    @SubscribeEvent
-    public static void drawHighlight( DrawBlockHighlightEvent event )
+    public static boolean drawHighlight( Camera camera, BlockHitResult hit )
     {
-        if( event.getTarget().type != RayTraceResult.Type.BLOCK ) return;
+        MinecraftClient mc = MinecraftClient.getInstance();
+        BlockPos pos = hit.getBlockPos();
+        World world = mc.world;
 
-        BlockPos pos = event.getTarget().getBlockPos();
-        World world = event.getPlayer().getEntityWorld();
-
-        IBlockState state = world.getBlockState( pos );
+        BlockState state = world.getBlockState( pos );
 
         // We only care about instances with both cable and modem.
         if( state.getBlock() != ComputerCraft.Blocks.cable || state.get( BlockCable.MODEM ).getFacing() == null || !state.get( BlockCable.CABLE ) )
         {
-            return;
+            return false;
         }
 
-        event.setCanceled( true );
-
-        EntityPlayer player = event.getPlayer();
-        Minecraft mc = Minecraft.getInstance();
-        float partialTicks = event.getPartialTicks();
-
         GlStateManager.enableBlend();
         GlStateManager.blendFuncSeparate( GlStateManager.SourceFactor.SRC_ALPHA, GlStateManager.DestFactor.ONE_MINUS_SRC_ALPHA, GlStateManager.SourceFactor.ONE, GlStateManager.DestFactor.ZERO );
-        GlStateManager.lineWidth( Math.max( 2.5F, mc.mainWindow.getFramebufferWidth() / 1920.0F * 2.5F ) );
-        GlStateManager.disableTexture2D();
+        GlStateManager.lineWidth( Math.max( 2.5F, mc.window.getFramebufferWidth() / 1920.0F * 2.5F ) );
+        GlStateManager.disableTexture();
         GlStateManager.depthMask( false );
         GlStateManager.matrixMode( GL11.GL_PROJECTION );
         GlStateManager.pushMatrix();
         GlStateManager.scalef( 1.0F, 1.0F, 0.999F );
 
-        double x = player.lastTickPosX + (player.posX - player.lastTickPosX) * partialTicks;
-        double y = player.lastTickPosY + (player.posY - player.lastTickPosY) * partialTicks;
-        double z = player.lastTickPosZ + (player.posZ - player.lastTickPosZ) * partialTicks;
-
-        VoxelShape shape = WorldUtil.isVecInside( CableShapes.getModemShape( state ), event.getTarget().hitVec.subtract( pos.getX(), pos.getY(), pos.getZ() ) )
+        VoxelShape shape = WorldUtil.isVecInside( CableShapes.getModemShape( state ), hit.getPos().subtract( pos.getX(), pos.getY(), pos.getZ() ) )
             ? CableShapes.getModemShape( state )
             : CableShapes.getCableShape( state );
 
-        WorldRenderer.drawShape( shape, pos.getX() - x, pos.getY() - y, pos.getZ() - z, 0.0F, 0.0F, 0.0F, 0.4F );
+        WorldRenderer.drawShapeOutline( shape, pos.getX() - camera.getPos().getX(), pos.getY() - camera.getPos().getY(), pos.getZ() - camera.getPos().getZ(), 0.0F, 0.0F, 0.0F, 0.4F );
 
         GlStateManager.popMatrix();
         GlStateManager.matrixMode( GL11.GL_MODELVIEW );
         GlStateManager.depthMask( true );
-        GlStateManager.enableTexture2D();
+        GlStateManager.enableTexture();
         GlStateManager.disableBlend();
+
+        return true;
     }
 }

src/main/java/dan200/computercraft/client/render/ItemMapLikeRenderer.java

@@ -6,13 +6,14 @@
 
 package dan200.computercraft.client.render;
 
-import net.minecraft.client.Minecraft;
-import net.minecraft.client.renderer.FirstPersonRenderer;
-import net.minecraft.client.renderer.GlStateManager;
-import net.minecraft.entity.player.EntityPlayer;
+import com.mojang.blaze3d.platform.GlStateManager;
+import dan200.computercraft.shared.mixed.MixedFirstPersonRenderer;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.render.FirstPersonRenderer;
+import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.ItemStack;
-import net.minecraft.util.EnumHand;
-import net.minecraft.util.EnumHandSide;
+import net.minecraft.util.AbsoluteHand;
+import net.minecraft.util.Hand;
 import net.minecraft.util.math.MathHelper;
 
 public abstract class ItemMapLikeRenderer
@@ -21,23 +22,23 @@ public abstract class ItemMapLikeRenderer
      * The main rendering method for the item
      *
      * @param stack The stack to render
-     * @see FirstPersonRenderer#renderMapFirstPerson(ItemStack)
+     * @see FirstPersonRenderer#renderFirstPersonMap(ItemStack)
      */
     protected abstract void renderItem( ItemStack stack );
 
-    protected void renderItemFirstPerson( EnumHand hand, float pitch, float equipProgress, float swingProgress, ItemStack stack )
+    public void renderItemFirstPerson( Hand hand, float pitch, float equipProgress, float swingProgress, ItemStack stack )
     {
-        EntityPlayer player = Minecraft.getInstance().player;
+        PlayerEntity player = MinecraftClient.getInstance().player;
 
         GlStateManager.pushMatrix();
-        if( hand == EnumHand.MAIN_HAND && player.getHeldItemOffhand().isEmpty() )
+        if( hand == Hand.MAIN_HAND && player.getOffHandStack().isEmpty() )
         {
             renderItemFirstPersonCenter( pitch, equipProgress, swingProgress, stack );
         }
         else
         {
             renderItemFirstPersonSide(
-                hand == EnumHand.MAIN_HAND ? player.getPrimaryHand() : player.getPrimaryHand().opposite(),
+                hand == Hand.MAIN_HAND ? player.getMainHand() : player.getMainHand().getOpposite(),
                 equipProgress, swingProgress, stack
             );
         }
@@ -51,12 +52,12 @@ public abstract class ItemMapLikeRenderer
      * @param equipProgress The equip progress of this item
      * @param swingProgress The swing progress of this item
      * @param stack         The stack to render
-     * @see FirstPersonRenderer#renderMapFirstPersonSide(float, EnumHandSide, float, ItemStack)
+     * @see FirstPersonRenderer#method_3222(float, AbsoluteHand, float, ItemStack) // renderMapFirstPersonSide
      */
-    private void renderItemFirstPersonSide( EnumHandSide side, float equipProgress, float swingProgress, ItemStack stack )
+    private void renderItemFirstPersonSide( AbsoluteHand side, float equipProgress, float swingProgress, ItemStack stack )
     {
-        Minecraft minecraft = Minecraft.getInstance();
-        float offset = side == EnumHandSide.RIGHT ? 1f : -1f;
+        MinecraftClient minecraft = MinecraftClient.getInstance();
+        float offset = side == AbsoluteHand.RIGHT ? 1f : -1f;
         GlStateManager.translatef( offset * 0.125f, -0.125f, 0f );
 
         // If the player is not invisible then render a single arm
@@ -64,7 +65,7 @@ public abstract class ItemMapLikeRenderer
         {
             GlStateManager.pushMatrix();
             GlStateManager.rotatef( offset * 10f, 0f, 0f, 1f );
-            minecraft.getFirstPersonRenderer().renderArmFirstPerson( equipProgress, swingProgress, side );
+            ((MixedFirstPersonRenderer) minecraft.getFirstPersonRenderer()).renderArmFirstPerson_CC( equipProgress, swingProgress, side );
             GlStateManager.popMatrix();
         }
 
@@ -93,11 +94,11 @@ public abstract class ItemMapLikeRenderer
      * @param equipProgress The equip progress of this item
      * @param swingProgress The swing progress of this item
      * @param stack         The stack to render
-     * @see FirstPersonRenderer#renderMapFirstPerson(float, float, float)
+     * @see FirstPersonRenderer#renderFirstPersonMap(float, float, float)
      */
     private void renderItemFirstPersonCenter( float pitch, float equipProgress, float swingProgress, ItemStack stack )
     {
-        FirstPersonRenderer renderer = Minecraft.getInstance().getFirstPersonRenderer();
+        MixedFirstPersonRenderer renderer = (MixedFirstPersonRenderer) MinecraftClient.getInstance().getFirstPersonRenderer();
 
         // Setup the appropriate transformations. This is just copied from the
         // corresponding method in ItemRenderer.
@@ -105,10 +106,10 @@ public abstract class ItemMapLikeRenderer
         float tX = -0.2f * MathHelper.sin( swingProgress * (float) Math.PI );
         float tZ = -0.4f * MathHelper.sin( swingRt * (float) Math.PI );
         GlStateManager.translatef( 0f, -tX / 2f, tZ );
-        float pitchAngle = renderer.getMapAngleFromPitch( pitch );
+        float pitchAngle = renderer.getMapAngleFromPitch_CC( pitch );
         GlStateManager.translatef( 0f, 0.04f + equipProgress * -1.2f + pitchAngle * -0.5f, -0.72f );
         GlStateManager.rotatef( pitchAngle * -85f, 1f, 0f, 0f );
-        renderer.renderArms();
+        renderer.renderArms_CC();
         float rX = MathHelper.sin( swingRt * (float) Math.PI );
         GlStateManager.rotatef( rX * 20f, 1f, 0f, 0f );
         GlStateManager.scalef( 2f, 2f, 2f );

src/main/java/dan200/computercraft/client/render/ItemPocketRenderer.java

@@ -6,6 +6,7 @@
 
 package dan200.computercraft.client.render;
 
+import com.mojang.blaze3d.platform.GlStateManager;
 import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.client.FrameInfo;
 import dan200.computercraft.client.gui.FixedWidthFontRenderer;
@@ -16,16 +17,13 @@ import dan200.computercraft.shared.computer.core.ComputerFamily;
 import dan200.computercraft.shared.pocket.items.ItemPocketComputer;
 import dan200.computercraft.shared.util.Colour;
 import dan200.computercraft.shared.util.Palette;
-import net.minecraft.client.Minecraft;
-import net.minecraft.client.renderer.BufferBuilder;
-import net.minecraft.client.renderer.GlStateManager;
-import net.minecraft.client.renderer.Tessellator;
-import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
+import net.fabricmc.api.EnvType;
+import net.fabricmc.api.Environment;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.render.BufferBuilder;
+import net.minecraft.client.render.Tessellator;
+import net.minecraft.client.render.VertexFormats;
 import net.minecraft.item.ItemStack;
-import net.minecraftforge.api.distmarker.Dist;
-import net.minecraftforge.client.event.RenderSpecificHandEvent;
-import net.minecraftforge.eventbus.api.SubscribeEvent;
-import net.minecraftforge.fml.common.Mod;
 import org.lwjgl.opengl.GL11;
 
 import static dan200.computercraft.client.gui.FixedWidthFontRenderer.*;
@@ -34,29 +32,19 @@ import static dan200.computercraft.client.gui.GuiComputer.*;
 /**
  * Emulates map rendering for pocket computers
  */
-@Mod.EventBusSubscriber( modid = ComputerCraft.MOD_ID, value = Dist.CLIENT )
+@Environment( EnvType.CLIENT )
 public final class ItemPocketRenderer extends ItemMapLikeRenderer
 {
     private static final int MARGIN = 2;
     private static final int FRAME = 12;
     private static final int LIGHT_HEIGHT = 8;
 
-    private static final ItemPocketRenderer INSTANCE = new ItemPocketRenderer();
+    public static final ItemPocketRenderer INSTANCE = new ItemPocketRenderer();
 
     private ItemPocketRenderer()
     {
     }
 
-    @SubscribeEvent
-    public static void renderItem( RenderSpecificHandEvent event )
-    {
-        ItemStack stack = event.getItemStack();
-        if( !(stack.getItem() instanceof ItemPocketComputer) ) return;
-
-        event.setCanceled( true );
-        INSTANCE.renderItemFirstPerson( event.getHand(), event.getInterpolatedPitch(), event.getEquipProgress(), event.getSwingProgress(), event.getItemStack() );
-    }
-
     @Override
     protected void renderItem( ItemStack stack )
     {
@@ -112,13 +100,13 @@ public final class ItemPocketRenderer extends ItemMapLikeRenderer
         else
         {
             // Otherwise render a plain background
-            Minecraft.getInstance().getTextureManager().bindTexture( BACKGROUND );
+            MinecraftClient.getInstance().getTextureManager().bindTexture( BACKGROUND );
 
             Tessellator tessellator = Tessellator.getInstance();
-            BufferBuilder buffer = tessellator.getBuffer();
+            BufferBuilder buffer = tessellator.getBufferBuilder();
 
             Colour black = Colour.Black;
-            buffer.begin( GL11.GL_QUADS, DefaultVertexFormats.POSITION );
+            buffer.begin( GL11.GL_QUADS, VertexFormats.POSITION );
             renderTexture( buffer, 0, 0, 0, 0, width, height, black.getR(), black.getG(), black.getB() );
             tessellator.draw();
         }
@@ -131,7 +119,7 @@ public final class ItemPocketRenderer extends ItemMapLikeRenderer
     private static void renderFrame( ComputerFamily family, int colour, int width, int height )
     {
 
-        Minecraft.getInstance().getTextureManager().bindTexture( colour != -1
+        MinecraftClient.getInstance().getTextureManager().bindTexture( colour != -1
             ? BACKGROUND_COLOUR
             : family == ComputerFamily.Normal ? BACKGROUND_NORMAL : BACKGROUND_ADVANCED
         );
@@ -141,8 +129,8 @@ public final class ItemPocketRenderer extends ItemMapLikeRenderer
         float b = (colour & 0xFF) / 255.0f;
 
         Tessellator tessellator = Tessellator.getInstance();
-        BufferBuilder buffer = tessellator.getBuffer();
-        buffer.begin( GL11.GL_QUADS, DefaultVertexFormats.POSITION_TEX_COLOR );
+        BufferBuilder buffer = tessellator.getBufferBuilder();
+        buffer.begin( GL11.GL_QUADS, VertexFormats.POSITION_UV_COLOR );
 
         // Top left, middle, right
         renderTexture( buffer, -FRAME, -FRAME, 12, 28, FRAME, FRAME, r, g, b );
@@ -173,22 +161,22 @@ public final class ItemPocketRenderer extends ItemMapLikeRenderer
     private static void renderLight( int colour, int width, int height )
     {
         GlStateManager.enableBlend();
-        GlStateManager.disableTexture2D();
+        GlStateManager.disableTexture();
 
         float r = ((colour >>> 16) & 0xFF) / 255.0f;
         float g = ((colour >>> 8) & 0xFF) / 255.0f;
         float b = (colour & 0xFF) / 255.0f;
 
         Tessellator tessellator = Tessellator.getInstance();
-        BufferBuilder buffer = tessellator.getBuffer();
-        buffer.begin( GL11.GL_QUADS, DefaultVertexFormats.POSITION_COLOR );
-        buffer.pos( width - LIGHT_HEIGHT * 2, height + LIGHT_HEIGHT + FRAME / 2.0f, 0.0D ).color( r, g, b, 1.0f ).endVertex();
-        buffer.pos( width, height + LIGHT_HEIGHT + FRAME / 2.0f, 0.0D ).color( r, g, b, 1.0f ).endVertex();
-        buffer.pos( width, height + FRAME / 2.0f, 0.0D ).color( r, g, b, 1.0f ).endVertex();
-        buffer.pos( width - LIGHT_HEIGHT * 2, height + FRAME / 2.0f, 0.0D ).color( r, g, b, 1.0f ).endVertex();
+        BufferBuilder buffer = tessellator.getBufferBuilder();
+        buffer.begin( GL11.GL_QUADS, VertexFormats.POSITION_COLOR );
+        buffer.vertex( width - LIGHT_HEIGHT * 2, height + LIGHT_HEIGHT + FRAME / 2.0f, 0.0D ).color( r, g, b, 1.0f ).next();
+        buffer.vertex( width, height + LIGHT_HEIGHT + FRAME / 2.0f, 0.0D ).color( r, g, b, 1.0f ).next();
+        buffer.vertex( width, height + FRAME / 2.0f, 0.0D ).color( r, g, b, 1.0f ).next();
+        buffer.vertex( width - LIGHT_HEIGHT * 2, height + FRAME / 2.0f, 0.0D ).color( r, g, b, 1.0f ).next();
 
         tessellator.draw();
-        GlStateManager.enableTexture2D();
+        GlStateManager.enableTexture();
     }
 
     private static void renderTerminal( Terminal terminal, boolean greyscale, int width, int height )
@@ -246,9 +234,9 @@ public final class ItemPocketRenderer extends ItemMapLikeRenderer
     private static void renderTexture( BufferBuilder builder, int x, int y, int textureX, int textureY, int width, int height, int textureWidth, int textureHeight, float r, float g, float b )
     {
         float scale = 1 / 255.0f;
-        builder.pos( x, y + height, 0 ).tex( textureX * scale, (textureY + textureHeight) * scale ).color( r, g, b, 1.0f ).endVertex();
-        builder.pos( x + width, y + height, 0 ).tex( (textureX + textureWidth) * scale, (textureY + textureHeight) * scale ).color( r, g, b, 1.0f ).endVertex();
-        builder.pos( x + width, y, 0 ).tex( (textureX + textureWidth) * scale, textureY * scale ).color( r, g, b, 1.0f ).endVertex();
-        builder.pos( x, y, 0 ).tex( textureX * scale, textureY * scale ).color( r, g, b, 1.0f ).endVertex();
+        builder.vertex( x, y + height, 0 ).texture( textureX * scale, (textureY + textureHeight) * scale ).color( r, g, b, 1.0f ).next();
+        builder.vertex( x + width, y + height, 0 ).texture( (textureX + textureWidth) * scale, (textureY + textureHeight) * scale ).color( r, g, b, 1.0f ).next();
+        builder.vertex( x + width, y, 0 ).texture( (textureX + textureWidth) * scale, textureY * scale ).color( r, g, b, 1.0f ).next();
+        builder.vertex( x, y, 0 ).texture( textureX * scale, textureY * scale ).color( r, g, b, 1.0f ).next();
     }
 }

src/main/java/dan200/computercraft/client/render/ItemPrintoutRenderer.java

@@ -6,15 +6,12 @@
 
 package dan200.computercraft.client.render;
 
-import dan200.computercraft.ComputerCraft;
+import com.mojang.blaze3d.platform.GlStateManager;
 import dan200.computercraft.shared.media.items.ItemPrintout;
-import net.minecraft.client.renderer.GlStateManager;
+import net.fabricmc.api.EnvType;
+import net.fabricmc.api.Environment;
+import net.minecraft.entity.decoration.ItemFrameEntity;
 import net.minecraft.item.ItemStack;
-import net.minecraftforge.api.distmarker.Dist;
-import net.minecraftforge.client.event.RenderItemInFrameEvent;
-import net.minecraftforge.client.event.RenderSpecificHandEvent;
-import net.minecraftforge.eventbus.api.SubscribeEvent;
-import net.minecraftforge.fml.common.Mod;
 
 import static dan200.computercraft.client.gui.FixedWidthFontRenderer.FONT_HEIGHT;
 import static dan200.computercraft.client.gui.FixedWidthFontRenderer.FONT_WIDTH;
@@ -25,15 +22,16 @@ import static dan200.computercraft.shared.media.items.ItemPrintout.LINE_MAX_LENG
 /**
  * Emulates map and item-frame rendering for printouts
  */
-@Mod.EventBusSubscriber( modid = ComputerCraft.MOD_ID, value = Dist.CLIENT )
+@Environment( EnvType.CLIENT )
 public final class ItemPrintoutRenderer extends ItemMapLikeRenderer
 {
-    private static final ItemPrintoutRenderer INSTANCE = new ItemPrintoutRenderer();
+    public static final ItemPrintoutRenderer INSTANCE = new ItemPrintoutRenderer();
 
     private ItemPrintoutRenderer()
     {
     }
 
+    /*
     @SubscribeEvent
     public static void onRenderInHand( RenderSpecificHandEvent event )
     {
@@ -43,6 +41,7 @@ public final class ItemPrintoutRenderer extends ItemMapLikeRenderer
         event.setCanceled( true );
         INSTANCE.renderItemFirstPerson( event.getHand(), event.getInterpolatedPitch(), event.getEquipProgress(), event.getSwingProgress(), event.getItemStack() );
     }
+    */
 
     @Override
     protected void renderItem( ItemStack stack )
@@ -61,16 +60,13 @@ public final class ItemPrintoutRenderer extends ItemMapLikeRenderer
         GlStateManager.enableLighting();
     }
 
-    @SubscribeEvent
-    public static void onRenderInFrame( RenderItemInFrameEvent event )
+    public void renderInFrame( ItemFrameEntity entity, ItemStack stack )
     {
-        ItemStack stack = event.getItem();
-        if( !(stack.getItem() instanceof ItemPrintout) ) return;
-
-        event.setCanceled( true );
-
         GlStateManager.disableLighting();
 
+        int rotation = entity.getRotation();
+        GlStateManager.rotatef( (float) rotation * 360.0F / 8.0F, 0.0F, 0.0F, 1.0F );
+
         // Move a little bit forward to ensure we're not clipping with the frame
         GlStateManager.translatef( 0.0f, 0.0f, -0.001f );
         GlStateManager.rotatef( 180f, 0f, 0f, 1f );

src/main/java/dan200/computercraft/client/render/ModelTransformer.java

@@ -6,19 +6,13 @@
 
 package dan200.computercraft.client.render;
 
-import net.minecraft.client.renderer.model.BakedQuad;
-import net.minecraft.client.renderer.texture.TextureAtlasSprite;
-import net.minecraft.client.renderer.vertex.VertexFormat;
-import net.minecraft.util.EnumFacing;
-import net.minecraftforge.client.model.pipeline.IVertexConsumer;
-import net.minecraftforge.client.model.pipeline.LightUtil;
-import net.minecraftforge.client.model.pipeline.VertexTransformer;
-import net.minecraftforge.common.model.TRSRTransformation;
+import net.minecraft.client.render.VertexFormat;
+import net.minecraft.client.render.VertexFormatElement;
+import net.minecraft.client.render.VertexFormats;
+import net.minecraft.client.render.model.BakedQuad;
 
-import javax.annotation.Nonnull;
 import javax.vecmath.Matrix4f;
-import javax.vecmath.Point3f;
-import javax.vecmath.Vector3f;
+import javax.vecmath.Vector4f;
 import java.util.List;
 
 /**
@@ -40,6 +34,11 @@ public final class ModelTransformer
     }
 
     public static void transformQuadsTo( List<BakedQuad> output, List<BakedQuad> input, Matrix4f transform )
+    {
+        transformQuadsTo( VertexFormats.POSITION_COLOR_UV_NORMAL, output, input, transform );
+    }
+
+    public static void transformQuadsTo( VertexFormat format, List<BakedQuad> output, List<BakedQuad> input, Matrix4f transform )
     {
         if( transform == null || transform.equals( identity ) )
         {
@@ -47,224 +46,55 @@ public final class ModelTransformer
         }
         else
         {
-            Matrix4f normalMatrix = new Matrix4f( transform );
-            normalMatrix.invert();
-            normalMatrix.transpose();
-
-            for( BakedQuad quad : input ) output.add( doTransformQuad( quad, transform, normalMatrix ) );
+            for( BakedQuad quad : input ) output.add( doTransformQuad( format, quad, transform ) );
         }
     }
 
-    public static BakedQuad transformQuad( BakedQuad input, Matrix4f transform )
+    public static BakedQuad transformQuad( VertexFormat format, BakedQuad input, Matrix4f transform )
     {
         if( transform == null || transform.equals( identity ) ) return input;
-
-        Matrix4f normalMatrix = new Matrix4f( transform );
-        normalMatrix.invert();
-        normalMatrix.transpose();
-        return doTransformQuad( input, transform, normalMatrix );
+        return doTransformQuad( format, input, transform );
     }
 
-    private static BakedQuad doTransformQuad( BakedQuad input, Matrix4f positionMatrix, Matrix4f normalMatrix )
+    private static BakedQuad doTransformQuad( VertexFormat format, BakedQuad quad, Matrix4f transform )
     {
-
-        BakedQuadBuilder builder = new BakedQuadBuilder( input.getFormat() );
-        NormalAwareTransformer transformer = new NormalAwareTransformer( builder, positionMatrix, normalMatrix );
-        input.pipe( transformer );
-
-        if( transformer.areNormalsInverted() )
+        int[] vertexData = quad.getVertexData().clone();
+        int offset = 0;
+        BakedQuad copy = new BakedQuad( vertexData, -1, quad.getFace(), quad.getSprite() );
+        for( int i = 0; i < format.getElementCount(); ++i ) // For each vertex element
         {
-            builder.swap( 1, 3 );
-            transformer.areNormalsInverted();
-        }
-
-        return builder.build();
-    }
-
-    /**
-     * A vertex transformer that tracks whether the normals have been inverted and so the vertices
-     * should be reordered so backface culling works as expected.
-     */
-    private static class NormalAwareTransformer extends VertexTransformer
-    {
-        private final Matrix4f positionMatrix;
-        private final Matrix4f normalMatrix;
-
-        private int vertexIndex = 0, elementIndex = 0;
-        private final Point3f[] before = new Point3f[4];
-        private final Point3f[] after = new Point3f[4];
-
-        public NormalAwareTransformer( IVertexConsumer parent, Matrix4f positionMatrix, Matrix4f normalMatrix )
-        {
-            super( parent );
-            this.positionMatrix = positionMatrix;
-            this.normalMatrix = normalMatrix;
-        }
-
-        @Override
-        public void setQuadOrientation( @Nonnull EnumFacing orientation )
-        {
-            super.setQuadOrientation( orientation == null ? orientation : TRSRTransformation.rotate( positionMatrix, orientation ) );
-        }
-
-        @Override
-        public void put( int element, @Nonnull float... data )
-        {
-            switch( getVertexFormat().getElement( element ).getUsage() )
+            VertexFormatElement element = format.getElement( i );
+            if( element.isPosition() &&
+                element.getFormat() == VertexFormatElement.Format.FLOAT &&
+                element.getCount() == 3 ) // When we find a position element
             {
-                case POSITION:
+                for( int j = 0; j < 4; ++j ) // For each corner of the quad
                 {
-                    Point3f vec = new Point3f( data );
-                    Point3f newVec = new Point3f();
-                    positionMatrix.transform( vec, newVec );
+                    int start = offset + j * format.getVertexSize();
+                    if( (start % 4) == 0 )
+                    {
+                        start = start / 4;
 
-                    float[] newData = new float[4];
-                    newVec.get( newData );
-                    super.put( element, newData );
+                        // Extract the position
+                        Vector4f pos = new Vector4f(
+                            Float.intBitsToFloat( vertexData[start] ),
+                            Float.intBitsToFloat( vertexData[start + 1] ),
+                            Float.intBitsToFloat( vertexData[start + 2] ),
+                            1
+                        );
 
+                        // Transform the position
+                        transform.transform( pos );
 
-                    before[vertexIndex] = vec;
-                    after[vertexIndex] = newVec;
-                    break;
+                        // Insert the position
+                        vertexData[start] = Float.floatToRawIntBits( pos.x );
+                        vertexData[start + 1] = Float.floatToRawIntBits( pos.y );
+                        vertexData[start + 2] = Float.floatToRawIntBits( pos.z );
+                    }
                 }
-                case NORMAL:
-                {
-                    Vector3f vec = new Vector3f( data );
-                    normalMatrix.transform( vec );
-
-                    float[] newData = new float[4];
-                    vec.get( newData );
-                    super.put( element, newData );
-                    break;
-                }
-                default:
-                    super.put( element, data );
-                    break;
-            }
-
-            elementIndex++;
-            if( elementIndex == getVertexFormat().getElementCount() )
-            {
-                vertexIndex++;
-                elementIndex = 0;
             }
+            offset += element.getSize();
         }
-
-        public boolean areNormalsInverted()
-        {
-            Vector3f temp1 = new Vector3f(), temp2 = new Vector3f();
-            Vector3f crossBefore = new Vector3f(), crossAfter = new Vector3f();
-
-            // Determine what cross product we expect to have
-            temp1.sub( before[1], before[0] );
-            temp2.sub( before[1], before[2] );
-            crossBefore.cross( temp1, temp2 );
-            normalMatrix.transform( crossBefore );
-
-            // And determine what cross product we actually have
-            temp1.sub( after[1], after[0] );
-            temp2.sub( after[1], after[2] );
-            crossAfter.cross( temp1, temp2 );
-
-            // If the angle between expected and actual cross product is greater than
-            // pi/2 radians then we will need to reorder our quads.
-            return Math.abs( crossBefore.angle( crossAfter ) ) >= Math.PI / 2;
-        }
-    }
-
-    /**
-     * A vertex consumer which is capable of building {@link BakedQuad}s.
-     *
-     * Equivalent to {@link net.minecraftforge.client.model.pipeline.UnpackedBakedQuad.Builder} but more memory
-     * efficient.
-     *
-     * This also provides the ability to swap vertices through {@link #swap(int, int)} to allow reordering.
-     */
-    private static final class BakedQuadBuilder implements IVertexConsumer
-    {
-        private final VertexFormat format;
-
-        private final int[] vertexData;
-        private int vertexIndex = 0, elementIndex = 0;
-
-        private EnumFacing orientation;
-        private int quadTint;
-        private boolean diffuse;
-        private TextureAtlasSprite texture;
-
-        private BakedQuadBuilder( VertexFormat format )
-        {
-            this.format = format;
-            vertexData = new int[format.getSize()];
-        }
-
-        @Nonnull
-        @Override
-        public VertexFormat getVertexFormat()
-        {
-            return format;
-        }
-
-        @Override
-        public void setQuadTint( int tint )
-        {
-            quadTint = tint;
-        }
-
-        @Override
-        public void setQuadOrientation( @Nonnull EnumFacing orientation )
-        {
-            this.orientation = orientation;
-        }
-
-        @Override
-        public void setApplyDiffuseLighting( boolean diffuse )
-        {
-            this.diffuse = diffuse;
-        }
-
-        @Override
-        public void setTexture( @Nonnull TextureAtlasSprite texture )
-        {
-            this.texture = texture;
-        }
-
-        @Override
-        public void put( int element, @Nonnull float... data )
-        {
-            LightUtil.pack( data, vertexData, format, vertexIndex, element );
-
-            elementIndex++;
-            if( elementIndex == getVertexFormat().getElementCount() )
-            {
-                vertexIndex++;
-                elementIndex = 0;
-            }
-        }
-
-        public void swap( int a, int b )
-        {
-            int length = vertexData.length / 4;
-            for( int i = 0; i < length; i++ )
-            {
-                int temp = vertexData[a * length + i];
-                vertexData[a * length + i] = vertexData[b * length + i];
-                vertexData[b * length + i] = temp;
-            }
-        }
-
-        public BakedQuad build()
-        {
-            if( elementIndex != 0 || vertexIndex != 4 )
-            {
-                throw new IllegalStateException( "Got an unexpected number of elements/vertices" );
-            }
-            if( texture == null )
-            {
-                throw new IllegalStateException( "Texture has not been set" );
-            }
-
-            return new BakedQuad( vertexData, quadTint, orientation, texture, diffuse, format );
-        }
+        return copy;
     }
 }

src/main/java/dan200/computercraft/client/render/MonitorHighlightRenderer.java

@@ -6,30 +6,24 @@
 
 package dan200.computercraft.client.render;
 
-import dan200.computercraft.ComputerCraft;
+import com.mojang.blaze3d.platform.GlStateManager;
 import dan200.computercraft.shared.peripheral.monitor.TileMonitor;
-import net.minecraft.client.Minecraft;
-import net.minecraft.client.renderer.BufferBuilder;
-import net.minecraft.client.renderer.GlStateManager;
-import net.minecraft.client.renderer.Tessellator;
-import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
-import net.minecraft.entity.player.EntityPlayer;
-import net.minecraft.tileentity.TileEntity;
-import net.minecraft.util.EnumFacing;
+import net.minecraft.block.entity.BlockEntity;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.render.BufferBuilder;
+import net.minecraft.client.render.Camera;
+import net.minecraft.client.render.Tessellator;
+import net.minecraft.client.render.VertexFormats;
+import net.minecraft.util.hit.BlockHitResult;
 import net.minecraft.util.math.BlockPos;
-import net.minecraft.util.math.RayTraceResult;
+import net.minecraft.util.math.Direction;
 import net.minecraft.world.World;
-import net.minecraftforge.api.distmarker.Dist;
-import net.minecraftforge.client.event.DrawBlockHighlightEvent;
-import net.minecraftforge.eventbus.api.SubscribeEvent;
-import net.minecraftforge.fml.common.Mod;
 import org.lwjgl.opengl.GL11;
 
 import java.util.EnumSet;
 
-import static net.minecraft.util.EnumFacing.*;
+import static net.minecraft.util.math.Direction.*;
 
-@Mod.EventBusSubscriber( modid = ComputerCraft.MOD_ID, value = Dist.CLIENT )
 public final class MonitorHighlightRenderer
 {
     private static final float EXPAND = 0.002f;
@@ -38,23 +32,22 @@ public final class MonitorHighlightRenderer
     {
     }
 
-    @SubscribeEvent
-    public static void drawHighlight( DrawBlockHighlightEvent event )
+    public static boolean drawHighlight( Camera camera, BlockHitResult hit )
     {
-        if( event.getTarget().type != RayTraceResult.Type.BLOCK || event.getPlayer().isSneaking() ) return;
+        MinecraftClient mc = MinecraftClient.getInstance();
+        if( mc.player.isSneaking() ) return false;
 
-        World world = event.getPlayer().getEntityWorld();
-        BlockPos pos = event.getTarget().getBlockPos();
+        BlockPos pos = hit.getBlockPos();
+        World world = mc.world;
 
-        TileEntity tile = world.getTileEntity( pos );
-        if( !(tile instanceof TileMonitor) ) return;
+        BlockEntity tile = world.getBlockEntity( pos );
+        if( !(tile instanceof TileMonitor) ) return false;
 
         TileMonitor monitor = (TileMonitor) tile;
-        event.setCanceled( true );
 
         // Determine which sides are part of the external faces of the monitor, and so which need to be rendered.
-        EnumSet<EnumFacing> faces = EnumSet.allOf( EnumFacing.class );
-        EnumFacing front = monitor.getFront();
+        EnumSet<Direction> faces = EnumSet.allOf( Direction.class );
+        Direction front = monitor.getFront();
         faces.remove( front );
         if( monitor.getXIndex() != 0 ) faces.remove( monitor.getRight().getOpposite() );
         if( monitor.getXIndex() != monitor.getWidth() - 1 ) faces.remove( monitor.getRight() );
@@ -62,22 +55,17 @@ public final class MonitorHighlightRenderer
         if( monitor.getYIndex() != monitor.getHeight() - 1 ) faces.remove( monitor.getDown() );
 
         GlStateManager.enableBlend();
-        GlStateManager.blendFuncSeparate(GlStateManager.SourceFactor.SRC_ALPHA, GlStateManager.DestFactor.ONE_MINUS_SRC_ALPHA, GlStateManager.SourceFactor.ONE, GlStateManager.DestFactor.ZERO);
-        GlStateManager.lineWidth(Math.max(2.5F, (float) Minecraft.getInstance().mainWindow.getFramebufferWidth() / 1920.0F * 2.5F));
-        GlStateManager.disableTexture2D();
+        GlStateManager.blendFuncSeparate( GlStateManager.SourceFactor.SRC_ALPHA, GlStateManager.DestFactor.ONE_MINUS_SRC_ALPHA, GlStateManager.SourceFactor.ONE, GlStateManager.DestFactor.ZERO );
+        GlStateManager.lineWidth( Math.max( 2.5F, (float) mc.window.getFramebufferWidth() / 1920.0F * 2.5F ) );
+        GlStateManager.disableTexture();
         GlStateManager.depthMask( false );
         GlStateManager.pushMatrix();
 
-        EntityPlayer player = event.getPlayer();
-        double x = player.lastTickPosX + (player.posX - player.lastTickPosX) * event.getPartialTicks();
-        double y = player.lastTickPosY + (player.posY - player.lastTickPosY) * event.getPartialTicks();
-        double z = player.lastTickPosZ + (player.posZ - player.lastTickPosZ) * event.getPartialTicks();
-
-        GlStateManager.translated( -x + pos.getX(), -y + pos.getY(), -z + pos.getZ() );
+        GlStateManager.translated( pos.getX() - camera.getPos().getX(), pos.getY() - camera.getPos().getY(), pos.getZ() - camera.getPos().getZ() );
 
         Tessellator tessellator = Tessellator.getInstance();
-        BufferBuilder buffer = tessellator.getBuffer();
-        buffer.begin( GL11.GL_LINES, DefaultVertexFormats.POSITION_COLOR );
+        BufferBuilder buffer = tessellator.getBufferBuilder();
+        buffer.begin( GL11.GL_LINES, VertexFormats.POSITION_COLOR );
 
         // I wish I could think of a better way to do this
         if( faces.contains( NORTH ) || faces.contains( WEST ) ) line( buffer, 0, 0, 0, UP );
@@ -97,21 +85,23 @@ public final class MonitorHighlightRenderer
 
         GlStateManager.popMatrix();
         GlStateManager.depthMask( true );
-        GlStateManager.enableTexture2D();
+        GlStateManager.enableTexture();
         GlStateManager.disableBlend();
+
+        return true;
     }
 
-    private static void line( BufferBuilder buffer, int x, int y, int z, EnumFacing direction )
+    private static void line( BufferBuilder buffer, int x, int y, int z, Direction direction )
     {
         double minX = x == 0 ? -EXPAND : 1 + EXPAND;
         double minY = y == 0 ? -EXPAND : 1 + EXPAND;
         double minZ = z == 0 ? -EXPAND : 1 + EXPAND;
 
-        buffer.pos( minX, minY, minZ ).color( 0, 0, 0, 0.4f ).endVertex();
-        buffer.pos(
-            minX + direction.getXOffset() * (1 + EXPAND * 2),
-            minY + direction.getYOffset() * (1 + EXPAND * 2),
-            minZ + direction.getZOffset() * (1 + EXPAND * 2)
-        ).color( 0, 0, 0, 0.4f ).endVertex();
+        buffer.vertex( minX, minY, minZ ).color( 0, 0, 0, 0.4f ).next();
+        buffer.vertex(
+            minX + direction.getOffsetX() * (1 + EXPAND * 2),
+            minY + direction.getOffsetY() * (1 + EXPAND * 2),
+            minZ + direction.getOffsetZ() * (1 + EXPAND * 2)
+        ).color( 0, 0, 0, 0.4f ).next();
     }
 }

src/main/java/dan200/computercraft/client/render/PrintoutRenderer.java

@@ -6,17 +6,17 @@
 
 package dan200.computercraft.client.render;
 
+import com.mojang.blaze3d.platform.GlStateManager;
+import com.mojang.blaze3d.platform.GlStateManager.DestFactor;
+import com.mojang.blaze3d.platform.GlStateManager.SourceFactor;
 import dan200.computercraft.client.gui.FixedWidthFontRenderer;
 import dan200.computercraft.core.terminal.TextBuffer;
 import dan200.computercraft.shared.util.Palette;
-import net.minecraft.client.Minecraft;
-import net.minecraft.client.renderer.BufferBuilder;
-import net.minecraft.client.renderer.GlStateManager;
-import net.minecraft.client.renderer.GlStateManager.DestFactor;
-import net.minecraft.client.renderer.GlStateManager.SourceFactor;
-import net.minecraft.client.renderer.Tessellator;
-import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
-import net.minecraft.util.ResourceLocation;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.render.BufferBuilder;
+import net.minecraft.client.render.Tessellator;
+import net.minecraft.client.render.VertexFormats;
+import net.minecraft.util.Identifier;
 import org.lwjgl.opengl.GL11;
 
 import static dan200.computercraft.client.gui.FixedWidthFontRenderer.FONT_HEIGHT;
@@ -24,7 +24,7 @@ import static dan200.computercraft.shared.media.items.ItemPrintout.LINES_PER_PAG
 
 public final class PrintoutRenderer
 {
-    private static final ResourceLocation BG = new ResourceLocation( "computercraft", "textures/gui/printout.png" );
+    private static final Identifier BG = new Identifier( "computercraft", "textures/gui/printout.png" );
     private static final double BG_SIZE = 256.0;
 
     /**
@@ -76,7 +76,7 @@ public final class PrintoutRenderer
     {
         GlStateManager.color4f( 1.0f, 1.0f, 1.0f, 1.0f );
         GlStateManager.enableBlend();
-        GlStateManager.enableTexture2D();
+        GlStateManager.enableTexture();
         GlStateManager.blendFuncSeparate( SourceFactor.SRC_ALPHA, DestFactor.ONE_MINUS_SRC_ALPHA, SourceFactor.ONE, DestFactor.ZERO );
 
         FixedWidthFontRenderer fontRenderer = FixedWidthFontRenderer.instance();
@@ -91,14 +91,14 @@ public final class PrintoutRenderer
     {
         GlStateManager.color4f( 1.0f, 1.0f, 1.0f, 1.0f );
         GlStateManager.enableBlend();
-        GlStateManager.enableTexture2D();
+        GlStateManager.enableTexture();
         GlStateManager.blendFuncSeparate( SourceFactor.SRC_ALPHA, DestFactor.ONE_MINUS_SRC_ALPHA, SourceFactor.ONE, DestFactor.ZERO );
 
-        Minecraft.getInstance().getTextureManager().bindTexture( BG );
+        MinecraftClient.getInstance().getTextureManager().bindTexture( BG );
 
         Tessellator tessellator = Tessellator.getInstance();
-        BufferBuilder buffer = tessellator.getBuffer();
-        buffer.begin( GL11.GL_QUADS, DefaultVertexFormats.POSITION_TEX );
+        BufferBuilder buffer = tessellator.getBufferBuilder();
+        buffer.begin( GL11.GL_QUADS, VertexFormats.POSITION_UV );
 
         int leftPages = page;
         int rightPages = pages - page - 1;
@@ -159,18 +159,18 @@ public final class PrintoutRenderer
 
     private static void drawTexture( BufferBuilder buffer, double x, double y, double z, double u, double v, double width, double height )
     {
-        buffer.pos( x, y + height, z ).tex( u / BG_SIZE, (v + height) / BG_SIZE ).endVertex();
-        buffer.pos( x + width, y + height, z ).tex( (u + width) / BG_SIZE, (v + height) / BG_SIZE ).endVertex();
-        buffer.pos( x + width, y, z ).tex( (u + width) / BG_SIZE, v / BG_SIZE ).endVertex();
-        buffer.pos( x, y, z ).tex( u / BG_SIZE, v / BG_SIZE ).endVertex();
+        buffer.vertex( x, y + height, z ).texture( u / BG_SIZE, (v + height) / BG_SIZE ).next();
+        buffer.vertex( x + width, y + height, z ).texture( (u + width) / BG_SIZE, (v + height) / BG_SIZE ).next();
+        buffer.vertex( x + width, y, z ).texture( (u + width) / BG_SIZE, v / BG_SIZE ).next();
+        buffer.vertex( x, y, z ).texture( u / BG_SIZE, v / BG_SIZE ).next();
     }
 
     private static void drawTexture( BufferBuilder buffer, double x, double y, double z, double width, double height, double u, double v, double tWidth, double tHeight )
     {
-        buffer.pos( x, y + height, z ).tex( u / BG_SIZE, (v + tHeight) / BG_SIZE ).endVertex();
-        buffer.pos( x + width, y + height, z ).tex( (u + tWidth) / BG_SIZE, (v + tHeight) / BG_SIZE ).endVertex();
-        buffer.pos( x + width, y, z ).tex( (u + tWidth) / BG_SIZE, v / BG_SIZE ).endVertex();
-        buffer.pos( x, y, z ).tex( u / BG_SIZE, v / BG_SIZE ).endVertex();
+        buffer.vertex( x, y + height, z ).texture( u / BG_SIZE, (v + tHeight) / BG_SIZE ).next();
+        buffer.vertex( x + width, y + height, z ).texture( (u + tWidth) / BG_SIZE, (v + tHeight) / BG_SIZE ).next();
+        buffer.vertex( x + width, y, z ).texture( (u + tWidth) / BG_SIZE, v / BG_SIZE ).next();
+        buffer.vertex( x, y, z ).texture( u / BG_SIZE, v / BG_SIZE ).next();
     }
 
     public static double offsetAt( int page )

src/main/java/dan200/computercraft/client/render/TileEntityCableRenderer.java

@@ -6,6 +6,7 @@
 
 package dan200.computercraft.client.render;
 
+import com.mojang.blaze3d.platform.GlStateManager;
 import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.shared.peripheral.modem.wired.BlockCable;
 import dan200.computercraft.shared.peripheral.modem.wired.CableModemVariant;
@@ -13,23 +14,19 @@ import dan200.computercraft.shared.peripheral.modem.wired.CableShapes;
 import dan200.computercraft.shared.peripheral.modem.wired.TileCable;
 import dan200.computercraft.shared.util.WorldUtil;
 import net.minecraft.block.Block;
-import net.minecraft.block.state.IBlockState;
-import net.minecraft.client.Minecraft;
-import net.minecraft.client.renderer.BufferBuilder;
-import net.minecraft.client.renderer.GlStateManager;
-import net.minecraft.client.renderer.Tessellator;
-import net.minecraft.client.renderer.WorldRenderer;
-import net.minecraft.client.renderer.model.IBakedModel;
-import net.minecraft.client.renderer.texture.TextureAtlasSprite;
-import net.minecraft.client.renderer.tileentity.TileEntityRenderer;
-import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
-import net.minecraft.util.BlockRenderLayer;
+import net.minecraft.block.BlockState;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.render.BufferBuilder;
+import net.minecraft.client.render.Tessellator;
+import net.minecraft.client.render.VertexFormats;
+import net.minecraft.client.render.WorldRenderer;
+import net.minecraft.client.render.block.entity.BlockEntityRenderer;
+import net.minecraft.client.render.model.BakedModel;
+import net.minecraft.client.texture.Sprite;
+import net.minecraft.util.hit.BlockHitResult;
+import net.minecraft.util.hit.HitResult;
 import net.minecraft.util.math.BlockPos;
-import net.minecraft.util.math.RayTraceResult;
 import net.minecraft.world.World;
-import net.minecraftforge.client.ForgeHooksClient;
-import net.minecraftforge.client.MinecraftForgeClient;
-import net.minecraftforge.client.model.data.EmptyModelData;
 import org.lwjgl.opengl.GL11;
 
 import javax.annotation.Nonnull;
@@ -38,7 +35,7 @@ import java.util.Random;
 /**
  * Render breaking animation only over part of a {@link TileCable}.
  */
-public class TileEntityCableRenderer extends TileEntityRenderer<TileCable>
+public class TileEntityCableRenderer extends BlockEntityRenderer<TileCable>
 {
     private static final Random random = new Random();
 
@@ -49,44 +46,34 @@ public class TileEntityCableRenderer extends TileEntityRenderer<TileCable>
 
         BlockPos pos = te.getPos();
 
-        Minecraft mc = Minecraft.getInstance();
+        MinecraftClient mc = MinecraftClient.getInstance();
 
-        RayTraceResult hit = mc.objectMouseOver;
-        if( hit == null || !hit.getBlockPos().equals( pos ) ) return;
-
-        if( MinecraftForgeClient.getRenderPass() != 0 ) return;
+        HitResult hit = mc.hitResult;
+        if( !(hit instanceof BlockHitResult) || !((BlockHitResult) hit).getBlockPos().equals( pos ) ) return;
 
         World world = te.getWorld();
-        IBlockState state = world.getBlockState( pos );
+        BlockState state = te.getCachedState();
         Block block = state.getBlock();
         if( block != ComputerCraft.Blocks.cable ) return;
 
-        state = WorldUtil.isVecInside( CableShapes.getModemShape( state ), hit.hitVec.subtract( pos.getX(), pos.getY(), pos.getZ() ) )
+        state = WorldUtil.isVecInside( CableShapes.getModemShape( state ), hit.getPos().subtract( pos.getX(), pos.getY(), pos.getZ() ) )
             ? block.getDefaultState().with( BlockCable.MODEM, state.get( BlockCable.MODEM ) )
             : state.with( BlockCable.MODEM, CableModemVariant.None );
 
-        IBakedModel model = mc.getBlockRendererDispatcher().getModelForState( state );
+        BakedModel model = mc.getBlockRenderManager().getModel( state );
 
         preRenderDamagedBlocks();
 
-        BufferBuilder buffer = Tessellator.getInstance().getBuffer();
-        buffer.begin( GL11.GL_QUADS, DefaultVertexFormats.BLOCK );
-        buffer.setTranslation( x - pos.getX(), y - pos.getY(), z - pos.getZ() );
-        buffer.noColor();
-
-        ForgeHooksClient.setRenderLayer( block.getRenderLayer() );
+        BufferBuilder buffer = Tessellator.getInstance().getBufferBuilder();
+        buffer.begin( GL11.GL_QUADS, VertexFormats.POSITION_COLOR_UV_LMAP );
+        buffer.setOffset( x - pos.getX(), y - pos.getY(), z - pos.getZ() );
+        buffer.disableColor();
 
         // See BlockRendererDispatcher#renderBlockDamage
-        TextureAtlasSprite breakingTexture = mc.getTextureMap().getSprite( DESTROY_STAGES[destroyStage] );
-        mc.getBlockRendererDispatcher().getBlockModelRenderer().renderModel(
-            world,
-            ForgeHooksClient.getDamageModel( model, breakingTexture, state, world, pos ),
-            state, pos, buffer, true, random, state.getPositionRandom( pos ), EmptyModelData.INSTANCE
-        );
+        Sprite breakingTexture = mc.getSpriteAtlas().getSprite( DESTROY_STAGE_TEXTURES[destroyStage] );
+        mc.getBlockRenderManager().tesselateDamage( state, pos, breakingTexture, world );
 
-        ForgeHooksClient.setRenderLayer( BlockRenderLayer.SOLID );
-
-        buffer.setTranslation( 0, 0, 0 );
+        buffer.setOffset( 0, 0, 0 );
         Tessellator.getInstance().draw();
 
         postRenderDamagedBlocks();

src/main/java/dan200/computercraft/client/render/TileEntityMonitorRenderer.java

@@ -6,6 +6,8 @@
 
 package dan200.computercraft.client.render;
 
+import com.mojang.blaze3d.platform.GLX;
+import com.mojang.blaze3d.platform.GlStateManager;
 import dan200.computercraft.client.FrameInfo;
 import dan200.computercraft.client.gui.FixedWidthFontRenderer;
 import dan200.computercraft.core.terminal.Terminal;
@@ -15,18 +17,16 @@ import dan200.computercraft.shared.peripheral.monitor.TileMonitor;
 import dan200.computercraft.shared.util.Colour;
 import dan200.computercraft.shared.util.DirectionUtil;
 import dan200.computercraft.shared.util.Palette;
-import net.minecraft.client.Minecraft;
-import net.minecraft.client.renderer.BufferBuilder;
-import net.minecraft.client.renderer.GlStateManager;
-import net.minecraft.client.renderer.OpenGlHelper;
-import net.minecraft.client.renderer.Tessellator;
-import net.minecraft.client.renderer.tileentity.TileEntityRenderer;
-import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
-import net.minecraft.util.EnumFacing;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.render.BufferBuilder;
+import net.minecraft.client.render.Tessellator;
+import net.minecraft.client.render.VertexFormats;
+import net.minecraft.client.render.block.entity.BlockEntityRenderer;
 import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.Direction;
 import org.lwjgl.opengl.GL11;
 
-public class TileEntityMonitorRenderer extends TileEntityRenderer<TileMonitor>
+public class TileEntityMonitorRenderer extends BlockEntityRenderer<TileMonitor>
 {
     @Override
     public void render( TileMonitor tileEntity, double posX, double posY, double posZ, float f, int i )
@@ -64,9 +64,9 @@ public class TileEntityMonitorRenderer extends TileEntityRenderer<TileMonitor>
         posZ += originPos.getZ() - monitorPos.getZ();
 
         // Determine orientation
-        EnumFacing dir = origin.getDirection();
-        EnumFacing front = origin.getFront();
-        float yaw = dir.getHorizontalAngle();
+        Direction dir = origin.getDirection();
+        Direction front = origin.getFront();
+        float yaw = dir.asRotation();
         float pitch = DirectionUtil.toPitchAngle( front );
 
         GlStateManager.pushMatrix();
@@ -85,16 +85,16 @@ public class TileEntityMonitorRenderer extends TileEntityRenderer<TileMonitor>
             double ySize = origin.getHeight() - 2.0 * (TileMonitor.RENDER_MARGIN + TileMonitor.RENDER_BORDER);
 
             // Get renderers
-            Minecraft mc = Minecraft.getInstance();
+            MinecraftClient mc = MinecraftClient.getInstance();
             Tessellator tessellator = Tessellator.getInstance();
-            BufferBuilder renderer = tessellator.getBuffer();
+            BufferBuilder renderer = tessellator.getBufferBuilder();
 
             // Get terminal
             boolean redraw = originTerminal.pollTerminalChanged();
 
             // Draw the contents
             GlStateManager.depthMask( false );
-            OpenGlHelper.glMultiTexCoord2f( OpenGlHelper.GL_TEXTURE1, 0xFFFF, 0xFFFF );
+            GLX.glMultiTexCoord2f( GLX.GL_TEXTURE1, 0xFFFF, 0xFFFF );
             GlStateManager.disableLighting();
             mc.gameRenderer.disableLightmap();
             try
@@ -171,7 +171,7 @@ public class TileEntityMonitorRenderer extends TileEntityRenderer<TileMonitor>
                             }
                         }
                         GlStateManager.callList( originTerminal.renderDisplayLists[0] );
-                        GlStateManager.resetColor();
+                        GlStateManager.clearCurrentColor();
 
                         // Draw text
                         fontRenderer.bindFont();
@@ -199,7 +199,7 @@ public class TileEntityMonitorRenderer extends TileEntityRenderer<TileMonitor>
                             }
                         }
                         GlStateManager.callList( originTerminal.renderDisplayLists[1] );
-                        GlStateManager.resetColor();
+                        GlStateManager.clearCurrentColor();
 
                         // Draw cursor
                         fontRenderer.bindFont();
@@ -233,7 +233,7 @@ public class TileEntityMonitorRenderer extends TileEntityRenderer<TileMonitor>
                         if( FrameInfo.getGlobalCursorBlink() )
                         {
                             GlStateManager.callList( originTerminal.renderDisplayLists[2] );
-                            GlStateManager.resetColor();
+                            GlStateManager.clearCurrentColor();
                         }
                     }
                     finally
@@ -251,11 +251,11 @@ public class TileEntityMonitorRenderer extends TileEntityRenderer<TileMonitor>
                     final float g = colour.getG();
                     final float b = colour.getB();
 
-                    renderer.begin( GL11.GL_TRIANGLE_STRIP, DefaultVertexFormats.POSITION_TEX_COLOR );
-                    renderer.pos( -TileMonitor.RENDER_MARGIN, TileMonitor.RENDER_MARGIN, 0.0D ).tex( 0.0, 0.0 ).color( r, g, b, 1.0f ).endVertex();
-                    renderer.pos( -TileMonitor.RENDER_MARGIN, -ySize - TileMonitor.RENDER_MARGIN, 0.0 ).tex( 0.0, 1.0 ).color( r, g, b, 1.0f ).endVertex();
-                    renderer.pos( xSize + TileMonitor.RENDER_MARGIN, TileMonitor.RENDER_MARGIN, 0.0D ).tex( 1.0, 0.0 ).color( r, g, b, 1.0f ).endVertex();
-                    renderer.pos( xSize + TileMonitor.RENDER_MARGIN, -ySize - TileMonitor.RENDER_MARGIN, 0.0 ).tex( 1.0, 1.0 ).color( r, g, b, 1.0f ).endVertex();
+                    renderer.begin( GL11.GL_TRIANGLE_STRIP, VertexFormats.POSITION_UV_COLOR );
+                    renderer.vertex( -TileMonitor.RENDER_MARGIN, TileMonitor.RENDER_MARGIN, 0.0D ).texture( 0.0, 0.0 ).color( r, g, b, 1.0f ).next();
+                    renderer.vertex( -TileMonitor.RENDER_MARGIN, -ySize - TileMonitor.RENDER_MARGIN, 0.0 ).texture( 0.0, 1.0 ).color( r, g, b, 1.0f ).next();
+                    renderer.vertex( xSize + TileMonitor.RENDER_MARGIN, TileMonitor.RENDER_MARGIN, 0.0D ).texture( 1.0, 0.0 ).color( r, g, b, 1.0f ).next();
+                    renderer.vertex( xSize + TileMonitor.RENDER_MARGIN, -ySize - TileMonitor.RENDER_MARGIN, 0.0 ).texture( 1.0, 1.0 ).color( r, g, b, 1.0f ).next();
                     tessellator.draw();
                 }
             }
@@ -271,11 +271,11 @@ public class TileEntityMonitorRenderer extends TileEntityRenderer<TileMonitor>
             try
             {
                 mc.getTextureManager().bindTexture( FixedWidthFontRenderer.BACKGROUND );
-                renderer.begin( GL11.GL_TRIANGLE_STRIP, DefaultVertexFormats.POSITION );
-                renderer.pos( -TileMonitor.RENDER_MARGIN, TileMonitor.RENDER_MARGIN, 0.0 ).endVertex();
-                renderer.pos( -TileMonitor.RENDER_MARGIN, -ySize - TileMonitor.RENDER_MARGIN, 0.0 ).endVertex();
-                renderer.pos( xSize + TileMonitor.RENDER_MARGIN, TileMonitor.RENDER_MARGIN, 0.0 ).endVertex();
-                renderer.pos( xSize + TileMonitor.RENDER_MARGIN, -ySize - TileMonitor.RENDER_MARGIN, 0.0 ).endVertex();
+                renderer.begin( GL11.GL_TRIANGLE_STRIP, VertexFormats.POSITION );
+                renderer.vertex( -TileMonitor.RENDER_MARGIN, TileMonitor.RENDER_MARGIN, 0.0 ).next();
+                renderer.vertex( -TileMonitor.RENDER_MARGIN, -ySize - TileMonitor.RENDER_MARGIN, 0.0 ).next();
+                renderer.vertex( xSize + TileMonitor.RENDER_MARGIN, TileMonitor.RENDER_MARGIN, 0.0 ).next();
+                renderer.vertex( xSize + TileMonitor.RENDER_MARGIN, -ySize - TileMonitor.RENDER_MARGIN, 0.0 ).next();
                 tessellator.draw();
             }
             finally

src/main/java/dan200/computercraft/client/render/TileEntityTurtleRenderer.java

@@ -6,6 +6,7 @@
 
 package dan200.computercraft.client.render;
 
+import com.mojang.blaze3d.platform.GlStateManager;
 import dan200.computercraft.api.turtle.ITurtleUpgrade;
 import dan200.computercraft.api.turtle.TurtleSide;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
@@ -13,39 +14,37 @@ import dan200.computercraft.shared.turtle.blocks.TileTurtle;
 import dan200.computercraft.shared.util.DirectionUtil;
 import dan200.computercraft.shared.util.Holiday;
 import dan200.computercraft.shared.util.HolidayUtil;
-import net.minecraft.block.state.IBlockState;
-import net.minecraft.client.Minecraft;
-import net.minecraft.client.renderer.BufferBuilder;
-import net.minecraft.client.renderer.GameRenderer;
-import net.minecraft.client.renderer.GlStateManager;
-import net.minecraft.client.renderer.Tessellator;
-import net.minecraft.client.renderer.model.BakedQuad;
-import net.minecraft.client.renderer.model.IBakedModel;
-import net.minecraft.client.renderer.model.ModelManager;
-import net.minecraft.client.renderer.model.ModelResourceLocation;
-import net.minecraft.client.renderer.texture.TextureMap;
-import net.minecraft.client.renderer.tileentity.TileEntityRenderer;
-import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
-import net.minecraft.client.renderer.vertex.VertexFormat;
-import net.minecraft.util.EnumFacing;
-import net.minecraft.util.ResourceLocation;
+import net.minecraft.block.BlockState;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.render.*;
+import net.minecraft.client.render.block.entity.BlockEntityRenderer;
+import net.minecraft.client.render.model.BakedModel;
+import net.minecraft.client.render.model.BakedModelManager;
+import net.minecraft.client.render.model.BakedQuad;
+import net.minecraft.client.texture.SpriteAtlasTexture;
+import net.minecraft.client.util.ModelIdentifier;
+import net.minecraft.util.Identifier;
+import net.minecraft.util.hit.BlockHitResult;
+import net.minecraft.util.math.Direction;
 import net.minecraft.util.math.Vec3d;
-import net.minecraftforge.client.ForgeHooksClient;
-import net.minecraftforge.client.model.data.EmptyModelData;
-import net.minecraftforge.client.model.pipeline.LightUtil;
+import net.minecraft.util.math.Vec3i;
 import org.apache.commons.lang3.tuple.Pair;
+import org.lwjgl.BufferUtils;
 import org.lwjgl.opengl.GL11;
 
 import javax.vecmath.Matrix4f;
+import java.nio.FloatBuffer;
 import java.util.List;
 import java.util.Random;
 
-public class TileEntityTurtleRenderer extends TileEntityRenderer<TileTurtle>
+public class TileEntityTurtleRenderer extends BlockEntityRenderer<TileTurtle>
 {
-    private static final ModelResourceLocation NORMAL_TURTLE_MODEL = new ModelResourceLocation( "computercraft:turtle_normal", "inventory" );
-    private static final ModelResourceLocation ADVANCED_TURTLE_MODEL = new ModelResourceLocation( "computercraft:turtle_advanced", "inventory" );
-    private static final ModelResourceLocation COLOUR_TURTLE_MODEL = new ModelResourceLocation( "computercraft:turtle_colour", "inventory" );
-    private static final ModelResourceLocation ELF_OVERLAY_MODEL = new ModelResourceLocation( "computercraft:turtle_elf_overlay", "inventory" );
+    private static final ModelIdentifier NORMAL_TURTLE_MODEL = new ModelIdentifier( "computercraft:turtle_normal", "inventory" );
+    private static final ModelIdentifier ADVANCED_TURTLE_MODEL = new ModelIdentifier( "computercraft:turtle_advanced", "inventory" );
+    private static final ModelIdentifier COLOUR_TURTLE_MODEL = new ModelIdentifier( "computercraft:turtle_colour", "inventory" );
+    private static final ModelIdentifier ELF_OVERLAY_MODEL = new ModelIdentifier( "computercraft:turtle_elf_overlay", "inventory" );
+
+    private static final FloatBuffer matrixBuf = BufferUtils.createFloatBuffer( 16 );
 
     @Override
     public void render( TileTurtle tileEntity, double posX, double posY, double posZ, float partialTicks, int breaking )
@@ -53,7 +52,7 @@ public class TileEntityTurtleRenderer extends TileEntityRenderer<TileTurtle>
         if( tileEntity != null ) renderTurtleAt( tileEntity, posX, posY, posZ, partialTicks );
     }
 
-    public static ModelResourceLocation getTurtleModel( ComputerFamily family, boolean coloured )
+    public static ModelIdentifier getTurtleModel( ComputerFamily family, boolean coloured )
     {
         switch( family )
         {
@@ -65,11 +64,11 @@ public class TileEntityTurtleRenderer extends TileEntityRenderer<TileTurtle>
         }
     }
 
-    public static ModelResourceLocation getTurtleOverlayModel( ResourceLocation overlay, boolean christmas )
+    public static ModelIdentifier getTurtleOverlayModel( Identifier overlay, boolean christmas )
     {
         if( overlay != null )
         {
-            return new ModelResourceLocation( overlay, "inventory" );
+            return new ModelIdentifier( overlay, "inventory" );
         }
         else if( christmas )
         {
@@ -85,21 +84,21 @@ public class TileEntityTurtleRenderer extends TileEntityRenderer<TileTurtle>
     {
         // Render the label
         String label = turtle.createProxy().getLabel();
-        if( label != null && rendererDispatcher.cameraHitResult != null && turtle.getPos().equals( rendererDispatcher.cameraHitResult.getBlockPos() ) )
+        if( label != null && renderManager.hitResult != null && renderManager.hitResult instanceof BlockHitResult && turtle.getPos().equals( ((BlockHitResult) renderManager.hitResult).getBlockPos() ) )
         {
-            setLightmapDisabled( true );
-            GameRenderer.drawNameplate(
+            disableLightmap( true );
+            GameRenderer.renderFloatingText(
                 getFontRenderer(), label,
                 (float) posX + 0.5F, (float) posY + 1.2F, (float) posZ + 0.5F, 0,
-                rendererDispatcher.entityYaw, rendererDispatcher.entityPitch, false, false
+                renderManager.cameraEntity.getYaw(), renderManager.cameraEntity.getPitch(), false
             );
-            setLightmapDisabled( false );
+            disableLightmap( false );
         }
 
         GlStateManager.pushMatrix();
         try
         {
-            IBlockState state = turtle.getBlockState();
+            BlockState state = turtle.getCachedState();
             // Setup the transform
             Vec3d offset = turtle.getRenderOffset( partialTicks );
             float yaw = turtle.getRenderYaw( partialTicks );
@@ -111,18 +110,18 @@ public class TileEntityTurtleRenderer extends TileEntityRenderer<TileTurtle>
             {
                 // Flip the model and swap the cull face as winding order will have changed.
                 GlStateManager.scalef( 1.0f, -1.0f, 1.0f );
-                GlStateManager.cullFace( GlStateManager.CullFace.FRONT );
+                GlStateManager.cullFace( GlStateManager.FaceSides.FRONT );
             }
             GlStateManager.translatef( -0.5f, -0.5f, -0.5f );
             // Render the turtle
             int colour = turtle.getColour();
             ComputerFamily family = turtle.getFamily();
-            ResourceLocation overlay = turtle.getOverlay();
+            Identifier overlay = turtle.getOverlay();
 
             renderModel( state, getTurtleModel( family, colour != -1 ), colour == -1 ? null : new int[] { colour } );
 
             // Render the overlay
-            ModelResourceLocation overlayModel = getTurtleOverlayModel(
+            ModelIdentifier overlayModel = getTurtleOverlayModel(
                 overlay,
                 HolidayUtil.getCurrentHoliday() == Holiday.Christmas
             );
@@ -149,11 +148,11 @@ public class TileEntityTurtleRenderer extends TileEntityRenderer<TileTurtle>
         finally
         {
             GlStateManager.popMatrix();
-            GlStateManager.cullFace( GlStateManager.CullFace.BACK );
+            GlStateManager.cullFace( GlStateManager.FaceSides.BACK );
         }
     }
 
-    private void renderUpgrade( IBlockState state, TileTurtle turtle, TurtleSide side, float f )
+    private void renderUpgrade( BlockState state, TileTurtle turtle, TurtleSide side, float f )
     {
         ITurtleUpgrade upgrade = turtle.getUpgrade( side );
         if( upgrade != null )
@@ -166,12 +165,21 @@ public class TileEntityTurtleRenderer extends TileEntityRenderer<TileTurtle>
                 GlStateManager.rotatef( -toolAngle, 1.0f, 0.0f, 0.0f );
                 GlStateManager.translatef( 0.0f, -0.5f, -0.5f );
 
-                Pair<IBakedModel, Matrix4f> pair = upgrade.getModel( turtle.getAccess(), side );
+                Pair<BakedModel, Matrix4f> pair = upgrade.getModel( turtle.getAccess(), side );
                 if( pair != null )
                 {
                     if( pair.getRight() != null )
                     {
-                        ForgeHooksClient.multiplyCurrentGlMatrix( pair.getRight() );
+                        matrixBuf.clear();
+                        float[] t = new float[4];
+                        for( int i = 0; i < 4; i++ )
+                        {
+                            pair.getRight().getColumn( i, t );
+                            matrixBuf.put( t );
+                        }
+                        matrixBuf.flip();
+
+                        GlStateManager.multMatrix( matrixBuf );
                     }
                     if( pair.getLeft() != null )
                     {
@@ -186,48 +194,43 @@ public class TileEntityTurtleRenderer extends TileEntityRenderer<TileTurtle>
         }
     }
 
-    private void renderModel( IBlockState state, ModelResourceLocation modelLocation, int[] tints )
+    private void renderModel( BlockState state, ModelIdentifier modelLocation, int[] tints )
     {
-        Minecraft mc = Minecraft.getInstance();
-        ModelManager modelManager = mc.getItemRenderer().getItemModelMesher().getModelManager();
+        MinecraftClient mc = MinecraftClient.getInstance();
+        BakedModelManager modelManager = mc.getItemRenderer().getModels().getModelManager();
         renderModel( state, modelManager.getModel( modelLocation ), tints );
     }
 
-    private void renderModel( IBlockState state, IBakedModel model, int[] tints )
+    private void renderModel( BlockState state, BakedModel model, int[] tints )
     {
         Random random = new Random( 0 );
         Tessellator tessellator = Tessellator.getInstance();
-        rendererDispatcher.textureManager.bindTexture( TextureMap.LOCATION_BLOCKS_TEXTURE );
-        renderQuads( tessellator, model.getQuads( state, null, random, EmptyModelData.INSTANCE ), tints );
-        for( EnumFacing facing : DirectionUtil.FACINGS )
+        renderManager.textureManager.bindTexture( SpriteAtlasTexture.BLOCK_ATLAS_TEX );
+        renderQuads( tessellator, model.getQuads( state, null, random ), tints );
+        for( Direction facing : DirectionUtil.FACINGS )
         {
-            renderQuads( tessellator, model.getQuads( state, facing, random, EmptyModelData.INSTANCE ), tints );
+            renderQuads( tessellator, model.getQuads( state, facing, random ), tints );
         }
     }
 
     private static void renderQuads( Tessellator tessellator, List<BakedQuad> quads, int[] tints )
     {
-        BufferBuilder buffer = tessellator.getBuffer();
-        VertexFormat format = DefaultVertexFormats.ITEM;
+        BufferBuilder buffer = tessellator.getBufferBuilder();
+        VertexFormat format = VertexFormats.POSITION_COLOR_UV_NORMAL;
         buffer.begin( GL11.GL_QUADS, format );
         for( BakedQuad quad : quads )
         {
-            VertexFormat quadFormat = quad.getFormat();
-            if( quadFormat != format )
-            {
-                tessellator.draw();
-                format = quadFormat;
-                buffer.begin( GL11.GL_QUADS, format );
-            }
-
             int colour = 0xFFFFFFFF;
-            if( quad.hasTintIndex() && tints != null )
+            if( quad.hasColor() && tints != null )
             {
-                int index = quad.getTintIndex();
+                int index = quad.getColorIndex();
                 if( index >= 0 && index < tints.length ) colour = tints[index] | 0xFF000000;
             }
 
-            LightUtil.renderQuadColor( buffer, quad, colour );
+            buffer.putVertexData( quad.getVertexData() );
+            buffer.setQuadColor( colour );
+            Vec3i normal = quad.getFace().getVector();
+            buffer.postNormal( normal.getX(), normal.getY(), normal.getZ() );
         }
         tessellator.draw();
     }

src/main/java/dan200/computercraft/client/render/TurtleModelLoader.java

@@ -7,14 +7,12 @@
 package dan200.computercraft.client.render;
 
 import dan200.computercraft.ComputerCraft;
-import net.minecraft.client.renderer.model.IBakedModel;
-import net.minecraft.client.renderer.model.IUnbakedModel;
-import net.minecraft.client.renderer.texture.TextureAtlasSprite;
-import net.minecraft.client.renderer.vertex.VertexFormat;
-import net.minecraft.resources.IResourceManager;
-import net.minecraft.util.ResourceLocation;
-import net.minecraftforge.client.model.ICustomModelLoader;
-import net.minecraftforge.common.model.IModelState;
+import net.minecraft.client.render.model.BakedModel;
+import net.minecraft.client.render.model.ModelBakeSettings;
+import net.minecraft.client.render.model.ModelLoader;
+import net.minecraft.client.render.model.UnbakedModel;
+import net.minecraft.client.texture.Sprite;
+import net.minecraft.util.Identifier;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -24,11 +22,11 @@ import java.util.Set;
 import java.util.function.Function;
 import java.util.stream.Collectors;
 
-public final class TurtleModelLoader implements ICustomModelLoader
+public final class TurtleModelLoader
 {
-    private static final ResourceLocation NORMAL_TURTLE_MODEL = new ResourceLocation( ComputerCraft.MOD_ID, "block/turtle_normal" );
-    private static final ResourceLocation ADVANCED_TURTLE_MODEL = new ResourceLocation( ComputerCraft.MOD_ID, "block/turtle_advanced" );
-    private static final ResourceLocation COLOUR_TURTLE_MODEL = new ResourceLocation( ComputerCraft.MOD_ID, "block/turtle_colour" );
+    private static final Identifier NORMAL_TURTLE_MODEL = new Identifier( ComputerCraft.MOD_ID, "block/turtle_normal" );
+    private static final Identifier ADVANCED_TURTLE_MODEL = new Identifier( ComputerCraft.MOD_ID, "block/turtle_advanced" );
+    private static final Identifier COLOUR_TURTLE_MODEL = new Identifier( ComputerCraft.MOD_ID, "block/turtle_colour" );
 
     public static final TurtleModelLoader INSTANCE = new TurtleModelLoader();
 
@@ -36,21 +34,14 @@ public final class TurtleModelLoader implements ICustomModelLoader
     {
     }
 
-    @Override
-    public void onResourceManagerReload( @Nonnull IResourceManager manager )
-    {
-    }
-
-    @Override
-    public boolean accepts( @Nonnull ResourceLocation name )
+    public boolean accepts( @Nonnull Identifier name )
     {
         return name.getNamespace().equals( ComputerCraft.MOD_ID )
             && (name.getPath().equals( "item/turtle_normal" ) || name.getPath().equals( "item/turtle_advanced" ));
     }
 
     @Nonnull
-    @Override
-    public IUnbakedModel loadModel( @Nonnull ResourceLocation name )
+    public UnbakedModel loadModel( @Nonnull Identifier name )
     {
         if( name.getNamespace().equals( ComputerCraft.MOD_ID ) )
         {
@@ -66,35 +57,35 @@ public final class TurtleModelLoader implements ICustomModelLoader
         throw new IllegalStateException( "Loader does not accept " + name );
     }
 
-    private static final class TurtleModel implements IUnbakedModel
+    private static final class TurtleModel implements UnbakedModel
     {
-        private final ResourceLocation family;
+        private final Identifier family;
 
-        private TurtleModel( ResourceLocation family ) {this.family = family;}
+        private TurtleModel( Identifier family ) {this.family = family;}
 
         @Nonnull
         @Override
-        public Collection<ResourceLocation> getDependencies()
+        public Collection<Identifier> getModelDependencies()
         {
             return Arrays.asList( family, COLOUR_TURTLE_MODEL );
         }
 
         @Nonnull
         @Override
-        public Collection<ResourceLocation> getTextures( @Nonnull Function<ResourceLocation, IUnbakedModel> modelGetter, @Nonnull Set<String> missingTextureErrors )
+        public Collection<Identifier> getTextureDependencies( @Nonnull Function<Identifier, UnbakedModel> modelGetter, @Nonnull Set<String> missingTextureErrors )
         {
-            return getDependencies().stream()
-                .flatMap( x -> modelGetter.apply( x ).getTextures( modelGetter, missingTextureErrors ).stream() )
+            return getModelDependencies().stream()
+                .flatMap( x -> modelGetter.apply( x ).getTextureDependencies( modelGetter, missingTextureErrors ).stream() )
                 .collect( Collectors.toSet() );
         }
 
         @Nullable
         @Override
-        public IBakedModel bake( @Nonnull Function<ResourceLocation, IUnbakedModel> modelGetter, @Nonnull Function<ResourceLocation, TextureAtlasSprite> spriteGetter, @Nonnull IModelState state, boolean uvlock, @Nonnull VertexFormat format )
+        public BakedModel bake( @Nonnull ModelLoader loader, @Nonnull Function<Identifier, Sprite> spriteGetter, @Nonnull ModelBakeSettings state )
         {
             return new TurtleSmartItemModel(
-                modelGetter.apply( family ).bake( modelGetter, spriteGetter, state, uvlock, format ),
-                modelGetter.apply( COLOUR_TURTLE_MODEL ).bake( modelGetter, spriteGetter, state, uvlock, format )
+                loader.getOrLoadModel( family ).bake( loader, spriteGetter, state ),
+                loader.getOrLoadModel( COLOUR_TURTLE_MODEL ).bake( loader, spriteGetter, state )
             );
         }
     }

src/main/java/dan200/computercraft/client/render/TurtleMultiModel.java

@@ -6,32 +6,31 @@
 
 package dan200.computercraft.client.render;
 
-import net.minecraft.block.state.IBlockState;
-import net.minecraft.client.renderer.model.BakedQuad;
-import net.minecraft.client.renderer.model.IBakedModel;
-import net.minecraft.client.renderer.model.ItemOverrideList;
-import net.minecraft.client.renderer.texture.TextureAtlasSprite;
-import net.minecraft.util.EnumFacing;
-import net.minecraftforge.client.model.data.EmptyModelData;
-import net.minecraftforge.client.model.data.IModelData;
+import net.minecraft.block.BlockState;
+import net.minecraft.client.render.model.BakedModel;
+import net.minecraft.client.render.model.BakedQuad;
+import net.minecraft.client.render.model.json.ModelItemPropertyOverrideList;
+import net.minecraft.client.render.model.json.ModelTransformation;
+import net.minecraft.client.texture.Sprite;
+import net.minecraft.util.math.Direction;
 
 import javax.annotation.Nonnull;
 import javax.vecmath.Matrix4f;
 import java.util.*;
 
-public class TurtleMultiModel implements IBakedModel
+public class TurtleMultiModel implements BakedModel
 {
-    private final IBakedModel m_baseModel;
-    private final IBakedModel m_overlayModel;
+    private final BakedModel m_baseModel;
+    private final BakedModel m_overlayModel;
     private final Matrix4f m_generalTransform;
-    private final IBakedModel m_leftUpgradeModel;
+    private final BakedModel m_leftUpgradeModel;
     private final Matrix4f m_leftUpgradeTransform;
-    private final IBakedModel m_rightUpgradeModel;
+    private final BakedModel m_rightUpgradeModel;
     private final Matrix4f m_rightUpgradeTransform;
     private List<BakedQuad> m_generalQuads = null;
-    private Map<EnumFacing, List<BakedQuad>> m_faceQuads = new EnumMap<>( EnumFacing.class );
+    private Map<Direction, List<BakedQuad>> m_faceQuads = new EnumMap<>( Direction.class );
 
-    public TurtleMultiModel( IBakedModel baseModel, IBakedModel overlayModel, Matrix4f generalTransform, IBakedModel leftUpgradeModel, Matrix4f leftUpgradeTransform, IBakedModel rightUpgradeModel, Matrix4f rightUpgradeTransform )
+    public TurtleMultiModel( BakedModel baseModel, BakedModel overlayModel, Matrix4f generalTransform, BakedModel leftUpgradeModel, Matrix4f leftUpgradeTransform, BakedModel rightUpgradeModel, Matrix4f rightUpgradeTransform )
     {
         // Get the models
         m_baseModel = baseModel;
@@ -45,15 +44,7 @@ public class TurtleMultiModel implements IBakedModel
 
     @Nonnull
     @Override
-    @Deprecated
-    public List<BakedQuad> getQuads( IBlockState state, EnumFacing side, @Nonnull Random rand )
-    {
-        return getQuads( state, side, rand, EmptyModelData.INSTANCE );
-    }
-
-    @Nonnull
-    @Override
-    public List<BakedQuad> getQuads( IBlockState state, EnumFacing side, @Nonnull Random rand, @Nonnull IModelData data )
+    public List<BakedQuad> getQuads( BlockState state, Direction side, @Nonnull Random rand )
     {
         if( side != null )
         {
@@ -67,13 +58,13 @@ public class TurtleMultiModel implements IBakedModel
         }
     }
 
-    private List<BakedQuad> buildQuads( IBlockState state, EnumFacing side, Random rand )
+    private List<BakedQuad> buildQuads( BlockState state, Direction side, Random rand )
     {
         ArrayList<BakedQuad> quads = new ArrayList<>();
-        ModelTransformer.transformQuadsTo( quads, m_baseModel.getQuads( state, side, rand, EmptyModelData.INSTANCE ), m_generalTransform );
+        ModelTransformer.transformQuadsTo( quads, m_baseModel.getQuads( state, side, rand ), m_generalTransform );
         if( m_overlayModel != null )
         {
-            ModelTransformer.transformQuadsTo( quads, m_overlayModel.getQuads( state, side, rand, EmptyModelData.INSTANCE ), m_generalTransform );
+            ModelTransformer.transformQuadsTo( quads, m_overlayModel.getQuads( state, side, rand ), m_generalTransform );
         }
         if( m_leftUpgradeModel != null )
         {
@@ -83,7 +74,7 @@ public class TurtleMultiModel implements IBakedModel
                 upgradeTransform = new Matrix4f( m_generalTransform );
                 upgradeTransform.mul( m_leftUpgradeTransform );
             }
-            ModelTransformer.transformQuadsTo( quads, m_leftUpgradeModel.getQuads( state, side, rand, EmptyModelData.INSTANCE ), upgradeTransform );
+            ModelTransformer.transformQuadsTo( quads, m_leftUpgradeModel.getQuads( state, side, rand ), upgradeTransform );
         }
         if( m_rightUpgradeModel != null )
         {
@@ -93,49 +84,45 @@ public class TurtleMultiModel implements IBakedModel
                 upgradeTransform = new Matrix4f( m_generalTransform );
                 upgradeTransform.mul( m_rightUpgradeTransform );
             }
-            ModelTransformer.transformQuadsTo( quads, m_rightUpgradeModel.getQuads( state, side, rand , EmptyModelData.INSTANCE), upgradeTransform );
+            ModelTransformer.transformQuadsTo( quads, m_rightUpgradeModel.getQuads( state, side, rand ), upgradeTransform );
         }
         quads.trimToSize();
         return quads;
     }
 
     @Override
-    public boolean isAmbientOcclusion()
+    public boolean useAmbientOcclusion()
     {
-        return m_baseModel.isAmbientOcclusion();
+        return m_baseModel.useAmbientOcclusion();
     }
 
     @Override
-    public boolean isGui3d()
+    public boolean hasDepthInGui()
     {
-        return m_baseModel.isGui3d();
+        return m_baseModel.hasDepthInGui();
     }
 
     @Override
-    public boolean isBuiltInRenderer()
+    public boolean isBuiltin()
     {
-        return m_baseModel.isBuiltInRenderer();
+        return m_baseModel.isBuiltin();
     }
 
-    @Nonnull
     @Override
-    public TextureAtlasSprite getParticleTexture()
+    public Sprite getSprite()
     {
-        return m_baseModel.getParticleTexture();
+        return m_baseModel.getSprite();
     }
 
-    @Nonnull
     @Override
-    @Deprecated
-    public net.minecraft.client.renderer.model.ItemCameraTransforms getItemCameraTransforms()
+    public ModelTransformation getTransformation()
     {
-        return m_baseModel.getItemCameraTransforms();
+        return m_baseModel.getTransformation();
     }
 
-    @Nonnull
     @Override
-    public ItemOverrideList getOverrides()
+    public ModelItemPropertyOverrideList getItemPropertyOverrides()
     {
-        return ItemOverrideList.EMPTY;
+        return ModelItemPropertyOverrideList.EMPTY;
     }
 }

src/main/java/dan200/computercraft/client/render/TurtleSmartItemModel.java

@@ -12,26 +12,31 @@ import dan200.computercraft.api.turtle.TurtleSide;
 import dan200.computercraft.shared.turtle.items.ItemTurtle;
 import dan200.computercraft.shared.util.Holiday;
 import dan200.computercraft.shared.util.HolidayUtil;
-import net.minecraft.block.state.IBlockState;
-import net.minecraft.client.Minecraft;
-import net.minecraft.client.renderer.model.*;
-import net.minecraft.client.renderer.texture.TextureAtlasSprite;
-import net.minecraft.entity.EntityLivingBase;
+import net.minecraft.block.BlockState;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.render.model.BakedModel;
+import net.minecraft.client.render.model.BakedModelManager;
+import net.minecraft.client.render.model.BakedQuad;
+import net.minecraft.client.render.model.json.ModelItemPropertyOverrideList;
+import net.minecraft.client.render.model.json.ModelTransformation;
+import net.minecraft.client.texture.Sprite;
+import net.minecraft.client.util.ModelIdentifier;
+import net.minecraft.entity.LivingEntity;
 import net.minecraft.item.ItemStack;
-import net.minecraft.util.EnumFacing;
-import net.minecraft.util.ResourceLocation;
+import net.minecraft.util.Identifier;
+import net.minecraft.util.math.Direction;
 import net.minecraft.world.World;
-import net.minecraftforge.client.model.data.IModelData;
 import org.apache.commons.lang3.tuple.Pair;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 import javax.vecmath.Matrix4f;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Random;
 
-public class TurtleSmartItemModel implements IBakedModel
+public class TurtleSmartItemModel implements BakedModel
 {
     private static final Matrix4f s_identity, s_flip;
 
@@ -51,11 +56,11 @@ public class TurtleSmartItemModel implements IBakedModel
         final boolean m_colour;
         final ITurtleUpgrade m_leftUpgrade;
         final ITurtleUpgrade m_rightUpgrade;
-        final ResourceLocation m_overlay;
+        final Identifier m_overlay;
         final boolean m_christmas;
         final boolean m_flip;
 
-        TurtleModelCombination( boolean colour, ITurtleUpgrade leftUpgrade, ITurtleUpgrade rightUpgrade, ResourceLocation overlay, boolean christmas, boolean flip )
+        TurtleModelCombination( boolean colour, ITurtleUpgrade leftUpgrade, ITurtleUpgrade rightUpgrade, Identifier overlay, boolean christmas, boolean flip )
         {
             m_colour = colour;
             m_leftUpgrade = leftUpgrade;
@@ -95,35 +100,35 @@ public class TurtleSmartItemModel implements IBakedModel
         }
     }
 
-    private final IBakedModel familyModel;
-    private final IBakedModel colourModel;
+    private final BakedModel familyModel;
+    private final BakedModel colourModel;
 
-    private HashMap<TurtleModelCombination, IBakedModel> m_cachedModels;
-    private ItemOverrideList m_overrides;
+    private HashMap<TurtleModelCombination, BakedModel> m_cachedModels;
+    private ModelItemPropertyOverrideList m_overrides;
 
-    public TurtleSmartItemModel( IBakedModel familyModel, IBakedModel colourModel )
+    public TurtleSmartItemModel( BakedModel familyModel, BakedModel colourModel )
     {
         this.familyModel = familyModel;
         this.colourModel = colourModel;
 
         m_cachedModels = new HashMap<>();
-        m_overrides = new ItemOverrideList()
+        m_overrides = new ModelItemPropertyOverrideList( null, null, null, Collections.emptyList() )
         {
             @Nonnull
             @Override
-            public IBakedModel getModelWithOverrides( @Nonnull IBakedModel originalModel, @Nonnull ItemStack stack, @Nullable World world, @Nullable EntityLivingBase entity )
+            public BakedModel apply( @Nonnull BakedModel originalModel, @Nonnull ItemStack stack, @Nullable World world, @Nullable LivingEntity entity )
             {
                 ItemTurtle turtle = (ItemTurtle) stack.getItem();
                 int colour = turtle.getColour( stack );
                 ITurtleUpgrade leftUpgrade = turtle.getUpgrade( stack, TurtleSide.Left );
                 ITurtleUpgrade rightUpgrade = turtle.getUpgrade( stack, TurtleSide.Right );
-                ResourceLocation overlay = turtle.getOverlay( stack );
+                Identifier overlay = turtle.getOverlay( stack );
                 boolean christmas = HolidayUtil.getCurrentHoliday() == Holiday.Christmas;
                 String label = turtle.getLabel( stack );
                 boolean flip = label != null && (label.equals( "Dinnerbone" ) || label.equals( "Grumm" ));
                 TurtleModelCombination combo = new TurtleModelCombination( colour != -1, leftUpgrade, rightUpgrade, overlay, christmas, flip );
 
-                IBakedModel model = m_cachedModels.get( combo );
+                BakedModel model = m_cachedModels.get( combo );
                 if( model == null ) m_cachedModels.put( combo, model = buildModel( combo ) );
                 return model;
             }
@@ -132,22 +137,22 @@ public class TurtleSmartItemModel implements IBakedModel
 
     @Nonnull
     @Override
-    public ItemOverrideList getOverrides()
+    public ModelItemPropertyOverrideList getItemPropertyOverrides()
     {
         return m_overrides;
     }
 
-    private IBakedModel buildModel( TurtleModelCombination combo )
+    private BakedModel buildModel( TurtleModelCombination combo )
     {
-        Minecraft mc = Minecraft.getInstance();
-        ModelManager modelManager = mc.getItemRenderer().getItemModelMesher().getModelManager();
-        ModelResourceLocation overlayModelLocation = TileEntityTurtleRenderer.getTurtleOverlayModel( combo.m_overlay, combo.m_christmas );
+        MinecraftClient mc = MinecraftClient.getInstance();
+        BakedModelManager modelManager = mc.getItemRenderer().getModels().getModelManager();
+        ModelIdentifier overlayModelLocation = TileEntityTurtleRenderer.getTurtleOverlayModel( combo.m_overlay, combo.m_christmas );
 
-        IBakedModel baseModel = combo.m_colour ? colourModel : familyModel;
-        IBakedModel overlayModel = overlayModelLocation != null ? modelManager.getModel( overlayModelLocation ) : null;
+        BakedModel baseModel = combo.m_colour ? colourModel : familyModel;
+        BakedModel overlayModel = overlayModelLocation != null ? modelManager.getModel( overlayModelLocation ) : null;
         Matrix4f transform = combo.m_flip ? s_flip : s_identity;
-        Pair<IBakedModel, Matrix4f> leftModel = combo.m_leftUpgrade != null ? combo.m_leftUpgrade.getModel( null, TurtleSide.Left ) : null;
-        Pair<IBakedModel, Matrix4f> rightModel = combo.m_rightUpgrade != null ? combo.m_rightUpgrade.getModel( null, TurtleSide.Right ) : null;
+        Pair<BakedModel, Matrix4f> leftModel = combo.m_leftUpgrade != null ? combo.m_leftUpgrade.getModel( null, TurtleSide.Left ) : null;
+        Pair<BakedModel, Matrix4f> rightModel = combo.m_rightUpgrade != null ? combo.m_rightUpgrade.getModel( null, TurtleSide.Right ) : null;
         if( leftModel != null && rightModel != null )
         {
             return new TurtleMultiModel( baseModel, overlayModel, transform, leftModel.getLeft(), leftModel.getRight(), rightModel.getLeft(), rightModel.getRight() );
@@ -169,50 +174,38 @@ public class TurtleSmartItemModel implements IBakedModel
     @Nonnull
     @Override
     @Deprecated
-    public List<BakedQuad> getQuads( IBlockState state, EnumFacing facing, @Nonnull Random rand )
+    public List<BakedQuad> getQuads( BlockState state, Direction facing, Random rand )
     {
         return familyModel.getQuads( state, facing, rand );
     }
 
-    @Nonnull
     @Override
-    @Deprecated
-    public List<BakedQuad> getQuads( IBlockState state, EnumFacing facing, @Nonnull Random rand, @Nonnull IModelData data )
+    public boolean useAmbientOcclusion()
     {
-        return familyModel.getQuads( state, facing, rand, data );
+        return familyModel.useAmbientOcclusion();
     }
 
     @Override
-    public boolean isAmbientOcclusion()
+    public boolean hasDepthInGui()
     {
-        return familyModel.isAmbientOcclusion();
+        return familyModel.hasDepthInGui();
     }
 
     @Override
-    public boolean isGui3d()
+    public boolean isBuiltin()
     {
-        return familyModel.isGui3d();
+        return familyModel.isBuiltin();
     }
 
     @Override
-    public boolean isBuiltInRenderer()
+    public Sprite getSprite()
     {
-        return familyModel.isBuiltInRenderer();
+        return null;
     }
 
-    @Nonnull
     @Override
-    public TextureAtlasSprite getParticleTexture()
+    public ModelTransformation getTransformation()
     {
-        return familyModel.getParticleTexture();
+        return familyModel.getTransformation();
     }
-
-    @Nonnull
-    @Override
-    @Deprecated
-    public ItemCameraTransforms getItemCameraTransforms()
-    {
-        return familyModel.getItemCameraTransforms();
-    }
-
 }

src/main/java/dan200/computercraft/core/computer/MainThreadExecutor.java

@@ -10,7 +10,7 @@ import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.api.peripheral.IWorkMonitor;
 import dan200.computercraft.core.tracking.Tracking;
 import dan200.computercraft.shared.turtle.core.TurtleBrain;
-import net.minecraft.tileentity.TileEntity;
+import net.minecraft.block.entity.BlockEntity;
 
 import javax.annotation.Nonnull;
 import java.util.ArrayDeque;
@@ -29,7 +29,7 @@ import java.util.concurrent.TimeUnit;
  * this tick. At the beginning of the tick, we execute as many {@link MainThread} tasks as possible, until our
  * time-frame or the global time frame has expired.
  *
- * Then, when other objects (such as {@link TileEntity}) are ticked, we update how much time we've used using
+ * Then, when other objects (such as {@link BlockEntity}) are ticked, we update how much time we've used using
  * {@link IWorkMonitor#trackWork(long, TimeUnit)}.
  *
  * Now, if anywhere during this period, we use more than our allocated time slice, the executor is marked as

src/main/java/dan200/computercraft/core/filesystem/ResourceMount.java

@@ -11,12 +11,12 @@ import com.google.common.cache.CacheBuilder;
 import com.google.common.io.ByteStreams;
 import dan200.computercraft.api.filesystem.IMount;
 import dan200.computercraft.core.apis.handles.ArrayByteChannel;
-import net.minecraft.resources.IReloadableResourceManager;
-import net.minecraft.resources.IResource;
-import net.minecraft.resources.IResourceManager;
-import net.minecraft.util.ResourceLocation;
-import net.minecraftforge.resource.IResourceType;
-import net.minecraftforge.resource.ISelectiveResourceReloadListener;
+import net.minecraft.resource.ReloadableResourceManager;
+import net.minecraft.resource.Resource;
+import net.minecraft.resource.ResourceManager;
+import net.minecraft.resource.ResourceReloadListener;
+import net.minecraft.util.Identifier;
+import net.minecraft.util.profiler.Profiler;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -26,8 +26,9 @@ import java.io.InputStream;
 import java.nio.channels.Channels;
 import java.nio.channels.ReadableByteChannel;
 import java.util.*;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.Executor;
 import java.util.concurrent.TimeUnit;
-import java.util.function.Predicate;
 
 public class ResourceMount implements IMount
 {
@@ -57,12 +58,12 @@ public class ResourceMount implements IMount
 
     private final String namespace;
     private final String subPath;
-    private final IReloadableResourceManager manager;
+    private final ReloadableResourceManager manager;
 
     @Nullable
     private FileEntry root;
 
-    public ResourceMount( String namespace, String subPath, IReloadableResourceManager manager )
+    public ResourceMount( String namespace, String subPath, ReloadableResourceManager manager )
     {
         this.namespace = namespace;
         this.subPath = subPath;
@@ -75,8 +76,8 @@ public class ResourceMount implements IMount
     private void load()
     {
         boolean hasAny = false;
-        FileEntry newRoot = new FileEntry( new ResourceLocation( namespace, subPath ) );
-        for( ResourceLocation file : manager.getAllResourceLocations( subPath, s -> true ) )
+        FileEntry newRoot = new FileEntry( new Identifier( namespace, subPath ) );
+        for( Identifier file : manager.findResources( subPath, s -> true ) )
         {
             if( !file.getNamespace().equals( namespace ) ) continue;
 
@@ -119,7 +120,7 @@ public class ResourceMount implements IMount
             FileEntry nextEntry = lastEntry.children.get( part );
             if( nextEntry == null )
             {
-                lastEntry.children.put( part, nextEntry = new FileEntry( new ResourceLocation( namespace, subPath + "/" + path ) ) );
+                lastEntry.children.put( part, nextEntry = new FileEntry( new Identifier( namespace, subPath + "/" + path ) ) );
             }
 
             lastEntry = nextEntry;
@@ -163,7 +164,7 @@ public class ResourceMount implements IMount
 
             try
             {
-                IResource resource = manager.getResource( file.identifier );
+                Resource resource = manager.getResource( file.identifier );
                 InputStream s = resource.getInputStream();
                 int total = 0, read = 0;
                 do
@@ -219,11 +220,11 @@ public class ResourceMount implements IMount
 
     private static class FileEntry
     {
-        final ResourceLocation identifier;
+        final Identifier identifier;
         Map<String, FileEntry> children;
         long size = -1;
 
-        FileEntry( ResourceLocation identifier )
+        FileEntry( Identifier identifier )
         {
             this.identifier = identifier;
         }
@@ -240,34 +241,37 @@ public class ResourceMount implements IMount
     }
 
     /**
-     * A {@link ISelectiveResourceReloadListener} which reloads any associated mounts.
+     * A {@link ResourceReloadListener} which reloads any associated mounts.
      *
      * While people should really be keeping a permanent reference to this, some people construct it every
      * method call, so let's make this as small as possible.
      */
-    static class Listener implements ISelectiveResourceReloadListener
+    static class Listener implements ResourceReloadListener
     {
         private static final Listener INSTANCE = new Listener();
 
         private final Set<ResourceMount> mounts = Collections.newSetFromMap( new WeakHashMap<>() );
-        private final Set<IReloadableResourceManager> managers = Collections.newSetFromMap( new WeakHashMap<>() );
+        private final Set<ReloadableResourceManager> managers = Collections.newSetFromMap( new WeakHashMap<>() );
 
         @Override
-        public void onResourceManagerReload( @Nonnull IResourceManager manager )
+        public CompletableFuture<Void> reload( Synchronizer synchronizer, ResourceManager resourceManager, Profiler profiler, Profiler profiler1, Executor executor, Executor executor1 )
         {
-            // FIXME: Remove this. We need this patch in order to prevent trying to load ReloadRequirements.
-            onResourceManagerReload( manager, x -> true );
+            return CompletableFuture.runAsync( () -> {
+                profiler.push( "Mount reloading" );
+                try
+                {
+                    for( ResourceMount mount : mounts ) mount.load();
+                }
+                finally
+                {
+                    profiler.pop();
+                }
+            }, executor );
         }
 
-        @Override
-        public synchronized void onResourceManagerReload( @Nonnull IResourceManager manager, @Nonnull Predicate<IResourceType> predicate )
+        synchronized void add( ReloadableResourceManager manager, ResourceMount mount )
         {
-            for( ResourceMount mount : mounts ) mount.load();
-        }
-
-        synchronized void add( IReloadableResourceManager manager, ResourceMount mount )
-        {
-            if( managers.add( manager ) ) manager.addReloadListener( this );
+            if( managers.add( manager ) ) manager.registerListener( this );
             mounts.add( mount );
         }
     }

src/main/java/dan200/computercraft/core/terminal/Terminal.java

@@ -7,7 +7,7 @@
 package dan200.computercraft.core.terminal;
 
 import dan200.computercraft.shared.util.Palette;
-import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.nbt.CompoundTag;
 
 public class Terminal
 {
@@ -334,7 +334,7 @@ public class Terminal
         m_changed = false;
     }
 
-    public synchronized NBTTagCompound writeToNBT( NBTTagCompound nbt )
+    public synchronized CompoundTag writeToNBT( CompoundTag nbt )
     {
         nbt.putInt( "term_cursorX", m_cursorX );
         nbt.putInt( "term_cursorY", m_cursorY );
@@ -354,7 +354,7 @@ public class Terminal
         return nbt;
     }
 
-    public synchronized void readFromNBT( NBTTagCompound nbt )
+    public synchronized void readFromNBT( CompoundTag nbt )
     {
         m_cursorX = nbt.getInt( "term_cursorX" );
         m_cursorY = nbt.getInt( "term_cursorY" );
@@ -365,17 +365,17 @@ public class Terminal
         for( int n = 0; n < m_height; n++ )
         {
             m_text[n].fill( ' ' );
-            if( nbt.contains( "term_text_" + n ) )
+            if( nbt.containsKey( "term_text_" + n ) )
             {
                 m_text[n].write( nbt.getString( "term_text_" + n ) );
             }
             m_textColour[n].fill( base16.charAt( m_cursorColour ) );
-            if( nbt.contains( "term_textColour_" + n ) )
+            if( nbt.containsKey( "term_textColour_" + n ) )
             {
                 m_textColour[n].write( nbt.getString( "term_textColour_" + n ) );
             }
             m_backgroundColour[n].fill( base16.charAt( m_cursorBackgroundColour ) );
-            if( nbt.contains( "term_textBgColour_" + n ) )
+            if( nbt.containsKey( "term_textBgColour_" + n ) )
             {
                 m_backgroundColour[n].write( nbt.getString( "term_textBgColour_" + n ) );
             }

src/main/java/dan200/computercraft/shared/BundledRedstone.java

@@ -9,8 +9,8 @@ package dan200.computercraft.shared;
 import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.api.redstone.IBundledRedstoneProvider;
 import dan200.computercraft.shared.common.DefaultBundledRedstoneProvider;
-import net.minecraft.util.EnumFacing;
 import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.Direction;
 import net.minecraft.world.World;
 
 import javax.annotation.Nonnull;
@@ -24,18 +24,18 @@ public final class BundledRedstone
 
     private BundledRedstone() {}
 
-    public static synchronized void register( @Nonnull IBundledRedstoneProvider provider )
+    public static void register( @Nonnull IBundledRedstoneProvider provider )
     {
         Objects.requireNonNull( provider, "provider cannot be null" );
         providers.add( provider );
     }
 
-    public static int getDefaultOutput( @Nonnull World world, @Nonnull BlockPos pos, @Nonnull EnumFacing side )
+    public static int getDefaultOutput( @Nonnull World world, @Nonnull BlockPos pos, @Nonnull Direction side )
     {
         return World.isValid( pos ) ? DefaultBundledRedstoneProvider.getDefaultBundledRedstoneOutput( world, pos, side ) : -1;
     }
 
-    private static int getUnmaskedOutput( World world, BlockPos pos, EnumFacing side )
+    private static int getUnmaskedOutput( World world, BlockPos pos, Direction side )
     {
         if( !World.isValid( pos ) ) return -1;
 
@@ -60,7 +60,7 @@ public final class BundledRedstone
         return combinedSignal;
     }
 
-    public static int getOutput( World world, BlockPos pos, EnumFacing side )
+    public static int getOutput( World world, BlockPos pos, Direction side )
     {
         int signal = getUnmaskedOutput( world, pos, side );
         return signal >= 0 ? signal : 0;

src/main/java/dan200/computercraft/shared/Config.java

@@ -1,344 +0,0 @@
-/*
- * This file is part of ComputerCraft - http://www.computercraft.info
- * Copyright Daniel Ratcliffe, 2011-2019. Do not distribute without permission.
- * Send enquiries to dratcliffe@gmail.com
- */
-
-package dan200.computercraft.shared;
-
-import com.google.common.base.CaseFormat;
-import com.google.common.base.Converter;
-import dan200.computercraft.ComputerCraft;
-import dan200.computercraft.api.turtle.event.TurtleAction;
-import dan200.computercraft.core.apis.AddressPredicate;
-import dan200.computercraft.core.apis.http.websocket.Websocket;
-import net.minecraftforge.common.ForgeConfigSpec;
-import net.minecraftforge.eventbus.api.SubscribeEvent;
-import net.minecraftforge.fml.ModLoadingContext;
-import net.minecraftforge.fml.common.Mod;
-import net.minecraftforge.fml.config.ModConfig;
-
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.List;
-import java.util.concurrent.TimeUnit;
-
-import static dan200.computercraft.ComputerCraft.DEFAULT_HTTP_BLACKLIST;
-import static dan200.computercraft.ComputerCraft.DEFAULT_HTTP_WHITELIST;
-import static net.minecraftforge.common.ForgeConfigSpec.Builder;
-import static net.minecraftforge.common.ForgeConfigSpec.ConfigValue;
-
-@Mod.EventBusSubscriber( modid = ComputerCraft.MOD_ID, bus = Mod.EventBusSubscriber.Bus.MOD )
-public final class Config
-{
-    private static final int MODEM_MAX_RANGE = 100000;
-
-    private static final String TRANSLATION_PREFIX = "gui.computercraft.config.";
-
-    private static ConfigValue<Integer> computerSpaceLimit;
-    private static ConfigValue<Integer> floppySpaceLimit;
-    private static ConfigValue<Integer> maximumFilesOpen;
-    private static ConfigValue<Boolean> disableLua51Features;
-    private static ConfigValue<String> defaultComputerSettings;
-    private static ConfigValue<Boolean> debugEnabled;
-    private static ConfigValue<Boolean> logComputerErrors;
-
-    private static ConfigValue<Integer> computerThreads;
-    private static ConfigValue<Integer> maxMainGlobalTime;
-    private static ConfigValue<Integer> maxMainComputerTime;
-
-    private static ConfigValue<Boolean> httpEnabled;
-    private static ConfigValue<Boolean> httpWebsocketEnabled;
-    private static ConfigValue<List<? extends String>> httpWhitelist;
-    private static ConfigValue<List<? extends String>> httpBlacklist;
-
-    private static ConfigValue<Integer> httpTimeout;
-    private static ConfigValue<Integer> httpMaxRequests;
-    private static ConfigValue<Integer> httpMaxDownload;
-    private static ConfigValue<Integer> httpMaxUpload;
-    private static ConfigValue<Integer> httpMaxWebsockets;
-    private static ConfigValue<Integer> httpMaxWebsocketMessage;
-
-    private static ConfigValue<Boolean> commandBlockEnabled;
-    private static ConfigValue<Integer> modemRange;
-    private static ConfigValue<Integer> modemHighAltitudeRange;
-    private static ConfigValue<Integer> modemRangeDuringStorm;
-    private static ConfigValue<Integer> modemHighAltitudeRangeDuringStorm;
-    private static ConfigValue<Integer> maxNotesPerTick;
-
-    private static ConfigValue<Boolean> turtlesNeedFuel;
-    private static ConfigValue<Integer> turtleFuelLimit;
-    private static ConfigValue<Integer> advancedTurtleFuelLimit;
-    private static ConfigValue<Boolean> turtlesObeyBlockProtection;
-    private static ConfigValue<Boolean> turtlesCanPush;
-    private static ConfigValue<List<? extends String>> turtleDisabledActions;
-
-    private static final ForgeConfigSpec spec;
-
-    private Config() {}
-
-    static
-    {
-        Builder builder = new Builder();
-
-        { // General computers
-            computerSpaceLimit = builder
-                .comment( "The disk space limit for computers and turtles, in bytes" )
-                .translation( TRANSLATION_PREFIX + "computer_space_limit" )
-                .define( "computer_space_limit", ComputerCraft.computerSpaceLimit );
-
-            floppySpaceLimit = builder
-                .comment( "The disk space limit for floppy disks, in bytes" )
-                .translation( TRANSLATION_PREFIX + "floppy_space_limit" )
-                .define( "floppy_space_limit", ComputerCraft.floppySpaceLimit );
-
-            maximumFilesOpen = builder
-                .comment( "Set how many files a computer can have open at the same time. Set to 0 for unlimited." )
-                .translation( TRANSLATION_PREFIX + "maximum_open_files" )
-                .defineInRange( "maximum_open_files", ComputerCraft.maximumFilesOpen, 0, Integer.MAX_VALUE );
-
-            disableLua51Features = builder
-                .comment( "Set this to true to disable Lua 5.1 functions that will be removed in a future update. " +
-                    "Useful for ensuring forward compatibility of your programs now." )
-                .define( "disable_lua51_features", ComputerCraft.disable_lua51_features );
-
-            defaultComputerSettings = builder
-                .comment( "A comma separated list of default system settings to set on new computers. Example: " +
-                    "\"shell.autocomplete=false,lua.autocomplete=false,edit.autocomplete=false\" will disable all " +
-                    "autocompletion" )
-                .define( "default_computer_settings", ComputerCraft.default_computer_settings );
-
-            debugEnabled = builder
-                .comment( "Enable Lua's debug library. This is sandboxed to each computer, so is generally safe to be used by players." )
-                .define( "debug_enabled", ComputerCraft.debug_enable );
-
-            logComputerErrors = builder
-                .comment( "Log exceptions thrown by peripherals and other Lua objects.\n" +
-                    "This makes it easier for mod authors to debug problems, but may result in log spam should people use buggy methods." )
-                .define( "log_computer_errors", ComputerCraft.logPeripheralErrors );
-        }
-
-        {
-            builder.comment( "Controls execution behaviour of computers. This is largely intended for fine-tuning " +
-                "servers, and generally shouldn't need to be touched" );
-            builder.push( "execution" );
-
-            computerThreads = builder
-                .comment( "Set the number of threads computers can run on. A higher number means more computers can run " +
-                    "at once, but may induce lag.\n" +
-                    "Please note that some mods may not work with a thread count higher than 1. Use with caution." )
-                .worldRestart()
-                .defineInRange( "computer_threads", ComputerCraft.computer_threads, 1, Integer.MAX_VALUE );
-
-            maxMainGlobalTime = builder
-                .comment( "The maximum time that can be spent executing tasks in a single tick, in milliseconds.\n" +
-                    "Note, we will quite possibly go over this limit, as there's no way to tell how long a will take " +
-                    "- this aims to be the upper bound of the average time." )
-                .defineInRange( "max_main_global_time", (int) TimeUnit.NANOSECONDS.toMillis( ComputerCraft.maxMainGlobalTime ), 1, Integer.MAX_VALUE );
-
-            maxMainComputerTime = builder
-                .comment( "The ideal maximum time a computer can execute for in a tick, in milliseconds.\n" +
-                    "Note, we will quite possibly go over this limit, as there's no way to tell how long a will take " +
-                    "- this aims to be the upper bound of the average time." )
-                .defineInRange( "max_main_computer_time", (int) TimeUnit.NANOSECONDS.toMillis( ComputerCraft.maxMainComputerTime ), 1, Integer.MAX_VALUE );
-
-            builder.pop();
-        }
-
-        { // HTTP
-            builder.comment( "Controls the HTTP API" );
-            builder.push( "http" );
-
-            httpEnabled = builder
-                .comment( "Enable the \"http\" API on Computers (see \"http_whitelist\" and \"http_blacklist\" for more " +
-                    "fine grained control than this)" )
-                .define( "enabled", ComputerCraft.http_enable );
-
-            httpWebsocketEnabled = builder
-                .comment( "Enable use of http websockets. This requires the \"http_enable\" option to also be true." )
-                .define( "websocket_enabled", ComputerCraft.http_websocket_enable );
-
-            httpWhitelist = builder
-                .comment( "A list of wildcards for domains or IP ranges that can be accessed through the \"http\" API on Computers.\n" +
-                    "Set this to \"*\" to access to the entire internet. Example: \"*.pastebin.com\" will restrict access to just subdomains of pastebin.com.\n" +
-                    "You can use domain names (\"pastebin.com\"), wilcards (\"*.pastebin.com\") or CIDR notation (\"127.0.0.0/8\")." )
-                .defineList( "whitelist", Arrays.asList( DEFAULT_HTTP_WHITELIST ), x -> true );
-
-            httpBlacklist = builder
-                .comment( "A list of wildcards for domains or IP ranges that cannot be accessed through the \"http\" API on Computers.\n" +
-                    "If this is empty then all whitelisted domains will be accessible. Example: \"*.github.com\" will block access to all subdomains of github.com.\n" +
-                    "You can use domain names (\"pastebin.com\"), wilcards (\"*.pastebin.com\") or CIDR notation (\"127.0.0.0/8\")." )
-                .defineList( "blacklist", Arrays.asList( DEFAULT_HTTP_BLACKLIST ), x -> true );
-
-            httpTimeout = builder
-                .comment( "The period of time (in milliseconds) to wait before a HTTP request times out. Set to 0 for unlimited." )
-                .defineInRange( "timeout", ComputerCraft.httpTimeout, 0, Integer.MAX_VALUE );
-
-            httpMaxRequests = builder
-                .comment( "The number of http requests a computer can make at one time. Additional requests will be queued, and sent when the running requests have finished. Set to 0 for unlimited." )
-                .defineInRange( "max_requests", ComputerCraft.httpMaxRequests, 0, Integer.MAX_VALUE );
-
-            httpMaxDownload = builder
-                .comment( "The maximum size (in bytes) that a computer can download in a single request. Note that responses may receive more data than allowed, but this data will not be returned to the client." )
-                .defineInRange( "max_download", (int) ComputerCraft.httpMaxDownload, 0, Integer.MAX_VALUE );
-
-            httpMaxUpload = builder
-                .comment( "The maximum size (in bytes) that a computer can upload in a single request. This includes headers and POST text." )
-                .defineInRange( "max_upload", (int) ComputerCraft.httpMaxUpload, 0, Integer.MAX_VALUE );
-
-            httpMaxWebsockets = builder
-                .comment( "The number of websockets a computer can have open at one time. Set to 0 for unlimited." )
-                .defineInRange( "max_websockets", ComputerCraft.httpMaxWebsockets, 1, Integer.MAX_VALUE );
-
-            httpMaxWebsocketMessage = builder
-                .comment( "The maximum size (in bytes) that a computer can send or receive in one websocket packet." )
-                .defineInRange( "max_websocket_message", ComputerCraft.httpMaxWebsocketMessage, 0, Websocket.MAX_MESSAGE_SIZE );
-
-            builder.pop();
-        }
-
-        { // Peripherals
-            builder.comment( "Various options relating to peripherals." );
-            builder.push( "peripheral" );
-
-            commandBlockEnabled = builder
-                .comment( "Enable Command Block peripheral support" )
-                .define( "command_block_enabled", ComputerCraft.enableCommandBlock );
-
-            modemRange = builder
-                .comment( "The range of Wireless Modems at low altitude in clear weather, in meters" )
-                .defineInRange( "modem_range", ComputerCraft.modem_range, 0, MODEM_MAX_RANGE );
-
-            modemHighAltitudeRange = builder
-                .comment( "The range of Wireless Modems at maximum altitude in clear weather, in meters" )
-                .defineInRange( "modem_high_altitude_range", ComputerCraft.modem_highAltitudeRange, 0, MODEM_MAX_RANGE );
-
-            modemRangeDuringStorm = builder
-                .comment( "The range of Wireless Modems at low altitude in stormy weather, in meters" )
-                .defineInRange( "modem_range_during_storm", ComputerCraft.modem_rangeDuringStorm, 0, MODEM_MAX_RANGE );
-
-            modemHighAltitudeRangeDuringStorm = builder
-                .comment( "The range of Wireless Modems at maximum altitude in stormy weather, in meters" )
-                .defineInRange( "modem_high_altitude_range_during_storm", ComputerCraft.modem_highAltitudeRangeDuringStorm, 0, MODEM_MAX_RANGE );
-
-            maxNotesPerTick = builder
-                .comment( "Maximum amount of notes a speaker can play at once" )
-                .defineInRange( "max_notes_per_tick", ComputerCraft.maxNotesPerTick, 1, Integer.MAX_VALUE );
-
-            builder.pop();
-        }
-
-        { // Turtles
-            builder.comment( "Various options relating to turtles." );
-            builder.push( "turtle" );
-
-            turtlesNeedFuel = builder
-                .comment( "Set whether Turtles require fuel to move" )
-                .define( "need_fuel", ComputerCraft.turtlesNeedFuel );
-
-            turtleFuelLimit = builder
-                .comment( "The fuel limit for Turtles" )
-                .defineInRange( "normal_fuel_limit", ComputerCraft.turtleFuelLimit, 0, Integer.MAX_VALUE );
-
-            advancedTurtleFuelLimit = builder
-                .comment( "The fuel limit for Advanced Turtles" )
-                .defineInRange( "advanced_fuel_limit", ComputerCraft.advancedTurtleFuelLimit, 0, Integer.MAX_VALUE );
-
-            turtlesObeyBlockProtection = builder
-                .comment( "If set to true, Turtles will be unable to build, dig, or enter protected areas (such as near the server spawn point)" )
-                .define( "obey_block_protection", ComputerCraft.turtlesObeyBlockProtection );
-
-            turtlesCanPush = builder
-                .comment( "If set to true, Turtles will push entities out of the way instead of stopping if there is space to do so" )
-                .define( "can_push", ComputerCraft.turtlesCanPush );
-
-            turtleDisabledActions = builder
-                .comment( "A list of turtle actions which are disabled." )
-                .defineList( "disabled_actions", Collections.emptyList(), x -> x instanceof String && getAction( (String) x ) != null );
-
-            builder.pop();
-        }
-
-        spec = builder.build();
-    }
-
-    public static void load()
-    {
-        ModLoadingContext.get().registerConfig( ModConfig.Type.COMMON, spec );
-    }
-
-    public static void sync()
-    {
-        // General
-        ComputerCraft.computerSpaceLimit = computerSpaceLimit.get();
-        ComputerCraft.floppySpaceLimit = floppySpaceLimit.get();
-        ComputerCraft.maximumFilesOpen = maximumFilesOpen.get();
-        ComputerCraft.disable_lua51_features = disableLua51Features.get();
-        ComputerCraft.default_computer_settings = defaultComputerSettings.get();
-        ComputerCraft.debug_enable = debugEnabled.get();
-        ComputerCraft.computer_threads = computerThreads.get();
-        ComputerCraft.logPeripheralErrors = logComputerErrors.get();
-
-        // Execution
-        ComputerCraft.computer_threads = computerThreads.get();
-        ComputerCraft.maxMainGlobalTime = TimeUnit.MILLISECONDS.toNanos( maxMainGlobalTime.get() );
-        ComputerCraft.maxMainComputerTime = TimeUnit.MILLISECONDS.toNanos( maxMainComputerTime.get() );
-
-        // HTTP
-        ComputerCraft.http_enable = httpEnabled.get();
-        ComputerCraft.http_websocket_enable = httpWebsocketEnabled.get();
-        ComputerCraft.http_whitelist = new AddressPredicate( httpWhitelist.get() );
-        ComputerCraft.http_blacklist = new AddressPredicate( httpBlacklist.get() );
-
-        ComputerCraft.httpTimeout = httpTimeout.get();
-        ComputerCraft.httpMaxRequests = httpMaxRequests.get();
-        ComputerCraft.httpMaxDownload = httpMaxDownload.get();
-        ComputerCraft.httpMaxUpload = httpMaxUpload.get();
-        ComputerCraft.httpMaxWebsockets = httpMaxWebsockets.get();
-        ComputerCraft.httpMaxWebsocketMessage = httpMaxWebsocketMessage.get();
-
-        // Peripheral
-        ComputerCraft.enableCommandBlock = commandBlockEnabled.get();
-        ComputerCraft.maxNotesPerTick = maxNotesPerTick.get();
-        ComputerCraft.modem_range = modemRange.get();
-        ComputerCraft.modem_highAltitudeRange = modemHighAltitudeRange.get();
-        ComputerCraft.modem_rangeDuringStorm = modemRangeDuringStorm.get();
-        ComputerCraft.modem_highAltitudeRangeDuringStorm = modemHighAltitudeRangeDuringStorm.get();
-
-        // Turtles
-        ComputerCraft.turtlesNeedFuel = turtlesNeedFuel.get();
-        ComputerCraft.turtleFuelLimit = turtleFuelLimit.get();
-        ComputerCraft.advancedTurtleFuelLimit = advancedTurtleFuelLimit.get();
-        ComputerCraft.turtlesObeyBlockProtection = turtlesObeyBlockProtection.get();
-        ComputerCraft.turtlesCanPush = turtlesCanPush.get();
-
-        ComputerCraft.turtleDisabledActions.clear();
-        for( String value : turtleDisabledActions.get() ) ComputerCraft.turtleDisabledActions.add( getAction( value ) );
-    }
-
-    @SubscribeEvent
-    public static void sync( ModConfig.Loading event )
-    {
-        sync();
-    }
-
-    @SubscribeEvent
-    public static void sync( ModConfig.ConfigReloading event )
-    {
-        sync();
-    }
-
-    private static final Converter<String, String> converter = CaseFormat.LOWER_CAMEL.converterTo( CaseFormat.UPPER_UNDERSCORE );
-
-    private static TurtleAction getAction( String value )
-    {
-        try
-        {
-            return TurtleAction.valueOf( converter.convert( value ) );
-        }
-        catch( IllegalArgumentException e )
-        {
-            return null;
-        }
-    }
-}

src/main/java/dan200/computercraft/shared/Peripherals.java

@@ -9,8 +9,8 @@ package dan200.computercraft.shared;
 import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.api.peripheral.IPeripheral;
 import dan200.computercraft.api.peripheral.IPeripheralProvider;
-import net.minecraft.util.EnumFacing;
 import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.Direction;
 import net.minecraft.world.World;
 
 import javax.annotation.Nonnull;
@@ -30,12 +30,12 @@ public final class Peripherals
         providers.add( provider );
     }
 
-    public static IPeripheral getPeripheral( World world, BlockPos pos, EnumFacing side )
+    public static IPeripheral getPeripheral( World world, BlockPos pos, Direction side )
     {
-        return World.isValid( pos ) && !world.isRemote ? getPeripheralAt( world, pos, side ) : null;
+        return World.isValid( pos ) && !world.isClient ? getPeripheralAt( world, pos, side ) : null;
     }
 
-    private static IPeripheral getPeripheralAt( World world, BlockPos pos, EnumFacing side )
+    private static IPeripheral getPeripheralAt( World world, BlockPos pos, Direction side )
     {
         // Try the handlers in order:
         for( IPeripheralProvider peripheralProvider : providers )

src/main/java/dan200/computercraft/shared/PocketUpgrades.java

@@ -10,17 +10,13 @@ import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.api.pocket.IPocketUpgrade;
 import dan200.computercraft.shared.util.InventoryUtil;
 import net.minecraft.item.ItemStack;
-import net.minecraftforge.fml.ModContainer;
-import net.minecraftforge.fml.ModLoadingContext;
 
 import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
 import java.util.*;
 
 public final class PocketUpgrades
 {
     private static final Map<String, IPocketUpgrade> upgrades = new HashMap<>();
-    private static final IdentityHashMap<IPocketUpgrade, String> upgradeOwners = new IdentityHashMap<>();
 
     private PocketUpgrades() {}
 
@@ -36,9 +32,6 @@ public final class PocketUpgrades
         }
 
         upgrades.put( id, upgrade );
-
-        ModContainer mc = ModLoadingContext.get().getActiveContainer();
-        if( mc != null && mc.getModId() != null ) upgradeOwners.put( upgrade, mc.getModId() );
     }
 
     public static IPocketUpgrade get( String id )
@@ -65,12 +58,6 @@ public final class PocketUpgrades
         return null;
     }
 
-    @Nullable
-    public static String getOwner( IPocketUpgrade upgrade )
-    {
-        return upgradeOwners.get( upgrade );
-    }
-
     public static Iterable<IPocketUpgrade> getVanillaUpgrades()
     {
         List<IPocketUpgrade> vanilla = new ArrayList<>();

src/main/java/dan200/computercraft/shared/Registry.java

@@ -8,14 +8,18 @@ package dan200.computercraft.shared;
 
 import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.api.ComputerCraftAPI;
+import dan200.computercraft.shared.common.ColourableRecipe;
 import dan200.computercraft.shared.computer.blocks.BlockComputer;
 import dan200.computercraft.shared.computer.blocks.TileCommandComputer;
 import dan200.computercraft.shared.computer.blocks.TileComputer;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
 import dan200.computercraft.shared.computer.items.ItemComputer;
+import dan200.computercraft.shared.computer.recipe.ComputerUpgradeRecipe;
 import dan200.computercraft.shared.media.items.ItemDisk;
 import dan200.computercraft.shared.media.items.ItemPrintout;
 import dan200.computercraft.shared.media.items.ItemTreasureDisk;
+import dan200.computercraft.shared.media.recipes.DiskRecipe;
+import dan200.computercraft.shared.media.recipes.PrintoutRecipe;
 import dan200.computercraft.shared.peripheral.diskdrive.BlockDiskDrive;
 import dan200.computercraft.shared.peripheral.diskdrive.TileDiskDrive;
 import dan200.computercraft.shared.peripheral.modem.wired.*;
@@ -30,239 +34,215 @@ import dan200.computercraft.shared.peripheral.speaker.TileSpeaker;
 import dan200.computercraft.shared.pocket.items.ItemPocketComputer;
 import dan200.computercraft.shared.pocket.peripherals.PocketModem;
 import dan200.computercraft.shared.pocket.peripherals.PocketSpeaker;
+import dan200.computercraft.shared.pocket.recipes.PocketComputerUpgradeRecipe;
 import dan200.computercraft.shared.turtle.blocks.BlockTurtle;
 import dan200.computercraft.shared.turtle.blocks.TileTurtle;
-import dan200.computercraft.shared.turtle.core.TurtlePlayer;
 import dan200.computercraft.shared.turtle.items.ItemTurtle;
+import dan200.computercraft.shared.turtle.recipes.TurtleRecipe;
+import dan200.computercraft.shared.turtle.recipes.TurtleUpgradeRecipe;
 import dan200.computercraft.shared.turtle.upgrades.*;
-import dan200.computercraft.shared.util.CreativeTabMain;
+import dan200.computercraft.shared.util.ImpostorRecipe;
+import dan200.computercraft.shared.util.ImpostorShapelessRecipe;
+import net.fabricmc.fabric.api.block.FabricBlockSettings;
+import net.fabricmc.fabric.api.client.itemgroup.FabricItemGroupBuilder;
 import net.minecraft.block.Block;
-import net.minecraft.block.material.Material;
-import net.minecraft.entity.EntityType;
-import net.minecraft.init.Items;
-import net.minecraft.item.Item;
-import net.minecraft.item.ItemBlock;
-import net.minecraft.item.ItemGroup;
-import net.minecraft.tileentity.TileEntityType;
-import net.minecraft.util.ResourceLocation;
-import net.minecraftforge.event.RegistryEvent;
-import net.minecraftforge.eventbus.api.SubscribeEvent;
-import net.minecraftforge.fml.common.Mod;
-import net.minecraftforge.registries.IForgeRegistry;
+import net.minecraft.block.Material;
+import net.minecraft.block.entity.BlockEntityType;
+import net.minecraft.item.*;
+import net.minecraft.recipe.RecipeSerializer;
+import net.minecraft.util.Identifier;
+import net.minecraft.util.registry.MutableRegistry;
 
-@Mod.EventBusSubscriber( modid = ComputerCraft.MOD_ID, bus = Mod.EventBusSubscriber.Bus.MOD )
 public final class Registry
 {
-    private static final ItemGroup mainItemGroup = new CreativeTabMain();
+    private static final ItemGroup mainItemGroup = FabricItemGroupBuilder
+        .create( new Identifier( ComputerCraft.MOD_ID, "main" ) )
+        .icon( () -> new ItemStack( ComputerCraft.Items.computerNormal ) )
+        .build();
 
     private Registry()
     {
     }
 
-    @SubscribeEvent
-    public static void registerBlocks( RegistryEvent.Register<Block> event )
+    public static void registerBlocks( MutableRegistry<Block> registry )
     {
-        IForgeRegistry<Block> registry = event.getRegistry();
-
         // Computers
         ComputerCraft.Blocks.computerNormal = new BlockComputer(
-            Block.Properties.create( Material.ROCK ).hardnessAndResistance( 2.0f ),
+            FabricBlockSettings.of( Material.STONE ).hardness( 2.0f ).build(),
             ComputerFamily.Normal, TileComputer.FACTORY_NORMAL
         );
 
         ComputerCraft.Blocks.computerAdvanced = new BlockComputer(
-            Block.Properties.create( Material.ROCK ).hardnessAndResistance( 2.0f ),
+            FabricBlockSettings.of( Material.STONE ).hardness( 2.0f ).build(),
             ComputerFamily.Advanced, TileComputer.FACTORY_ADVANCED
         );
 
         ComputerCraft.Blocks.computerCommand = new BlockComputer(
-            Block.Properties.create( Material.ROCK ).hardnessAndResistance( -1, 6000000.0F ),
+            FabricBlockSettings.of( Material.STONE ).strength( -1, 6000000.0F ).build(),
             ComputerFamily.Command, TileCommandComputer.FACTORY
         );
 
-        registry.registerAll(
-            ComputerCraft.Blocks.computerNormal.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "computer_normal" ) ),
-            ComputerCraft.Blocks.computerAdvanced.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "computer_advanced" ) ),
-            ComputerCraft.Blocks.computerCommand.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "computer_command" ) )
-        );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "computer_normal" ), ComputerCraft.Blocks.computerNormal );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "computer_advanced" ), ComputerCraft.Blocks.computerAdvanced );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "computer_command" ), ComputerCraft.Blocks.computerCommand );
 
         // Turtles
         ComputerCraft.Blocks.turtleNormal = new BlockTurtle(
-            Block.Properties.create( Material.ROCK ).hardnessAndResistance( 2.5f ),
+            FabricBlockSettings.of( Material.STONE ).hardness( 2.5f ).build(),
             ComputerFamily.Normal, TileTurtle.FACTORY_NORMAL
         );
 
         ComputerCraft.Blocks.turtleAdvanced = new BlockTurtle(
-            Block.Properties.create( Material.ROCK ).hardnessAndResistance( 2.5f ),
+            FabricBlockSettings.of( Material.STONE ).hardness( 2.5f ).build(),
             ComputerFamily.Advanced, TileTurtle.FACTORY_ADVANCED
         );
 
-        registry.registerAll(
-            ComputerCraft.Blocks.turtleNormal.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "turtle_normal" ) ),
-            ComputerCraft.Blocks.turtleAdvanced.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "turtle_advanced" ) )
-        );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "turtle_normal" ), ComputerCraft.Blocks.turtleNormal );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "turtle_advanced" ), ComputerCraft.Blocks.turtleAdvanced );
 
         // Peripherals
         ComputerCraft.Blocks.speaker = new BlockSpeaker(
-            Block.Properties.create( Material.ROCK ).hardnessAndResistance( 2 )
+            FabricBlockSettings.of( Material.STONE ).hardness( 2 ).build()
         );
 
         ComputerCraft.Blocks.diskDrive = new BlockDiskDrive(
-            Block.Properties.create( Material.ROCK ).hardnessAndResistance( 2 )
+            FabricBlockSettings.of( Material.STONE ).hardness( 2 ).build()
         );
 
         ComputerCraft.Blocks.monitorNormal = new BlockMonitor(
-            Block.Properties.create( Material.ROCK ).hardnessAndResistance( 2 ),
+            FabricBlockSettings.of( Material.STONE ).hardness( 2 ).build(),
             TileMonitor.FACTORY_NORMAL
         );
 
         ComputerCraft.Blocks.monitorAdvanced = new BlockMonitor(
-            Block.Properties.create( Material.ROCK ).hardnessAndResistance( 2 ),
+            FabricBlockSettings.of( Material.STONE ).hardness( 2 ).build(),
             TileMonitor.FACTORY_ADVANCED
         );
 
         ComputerCraft.Blocks.printer = new BlockPrinter(
-            Block.Properties.create( Material.ROCK ).hardnessAndResistance( 2 )
+            FabricBlockSettings.of( Material.STONE ).hardness( 2 ).build()
         );
 
         ComputerCraft.Blocks.wirelessModemNormal = new BlockWirelessModem(
-            Block.Properties.create( Material.ROCK ).hardnessAndResistance( 2 ),
+            FabricBlockSettings.of( Material.STONE ).hardness( 2 ).build(),
             TileWirelessModem.FACTORY_NORMAL
         );
 
         ComputerCraft.Blocks.wirelessModemAdvanced = new BlockWirelessModem(
-            Block.Properties.create( Material.ROCK ).hardnessAndResistance( 2 ),
+            FabricBlockSettings.of( Material.STONE ).hardness( 2 ).build(),
             TileWirelessModem.FACTORY_ADVANCED
         );
 
         ComputerCraft.Blocks.wiredModemFull = new BlockWiredModemFull(
-            Block.Properties.create( Material.ROCK ).hardnessAndResistance( 1.5f )
+            FabricBlockSettings.of( Material.STONE ).hardness( 1.5f ).build()
         );
 
         ComputerCraft.Blocks.cable = new BlockCable(
-            Block.Properties.create( Material.ROCK ).hardnessAndResistance( 1.5f )
+            FabricBlockSettings.of( Material.STONE ).hardness( 1.5f ).build()
         );
 
-        registry.registerAll(
-            ComputerCraft.Blocks.speaker.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "speaker" ) ),
-            ComputerCraft.Blocks.diskDrive.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "disk_drive" ) ),
-            ComputerCraft.Blocks.monitorNormal.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "monitor_normal" ) ),
-            ComputerCraft.Blocks.monitorAdvanced.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "monitor_advanced" ) ),
-            ComputerCraft.Blocks.printer.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "printer" ) ),
-            ComputerCraft.Blocks.wirelessModemNormal.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "wireless_modem_normal" ) ),
-            ComputerCraft.Blocks.wirelessModemAdvanced.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "wireless_modem_advanced" ) ),
-            ComputerCraft.Blocks.wiredModemFull.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "wired_modem_full" ) ),
-            ComputerCraft.Blocks.cable.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "cable" ) )
-        );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "speaker" ), ComputerCraft.Blocks.speaker );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "disk_drive" ), ComputerCraft.Blocks.diskDrive );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "monitor_normal" ), ComputerCraft.Blocks.monitorNormal );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "monitor_advanced" ), ComputerCraft.Blocks.monitorAdvanced );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "printer" ), ComputerCraft.Blocks.printer );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "wireless_modem_normal" ), ComputerCraft.Blocks.wirelessModemNormal );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "wireless_modem_advanced" ), ComputerCraft.Blocks.wirelessModemAdvanced );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "wired_modem_full" ), ComputerCraft.Blocks.wiredModemFull );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "cable" ), ComputerCraft.Blocks.cable );
     }
 
-    @SubscribeEvent
-    public static void registerTileEntities( RegistryEvent.Register<TileEntityType<?>> event )
+    public static void registerTileEntities( MutableRegistry<BlockEntityType<?>> registry )
     {
-        IForgeRegistry<TileEntityType<?>> registry = event.getRegistry();
-
         // Computers
-        registry.registerAll( TileComputer.FACTORY_NORMAL, TileComputer.FACTORY_ADVANCED, TileCommandComputer.FACTORY );
+        registry.add( TileComputer.FACTORY_NORMAL.getId(), TileComputer.FACTORY_NORMAL );
+        registry.add( TileComputer.FACTORY_ADVANCED.getId(), TileComputer.FACTORY_ADVANCED );
+        registry.add( TileCommandComputer.FACTORY.getId(), TileCommandComputer.FACTORY );
 
         // Turtles
-        registry.registerAll( TileTurtle.FACTORY_NORMAL, TileTurtle.FACTORY_ADVANCED );
+        registry.add( TileTurtle.FACTORY_NORMAL.getId(), TileTurtle.FACTORY_NORMAL );
+        registry.add( TileTurtle.FACTORY_ADVANCED.getId(), TileTurtle.FACTORY_ADVANCED );
 
         // Peripherals
-        registry.registerAll(
-            TileSpeaker.FACTORY,
-            TileDiskDrive.FACTORY,
-            TileMonitor.FACTORY_NORMAL,
-            TileMonitor.FACTORY_ADVANCED,
-            TilePrinter.FACTORY,
-            TileWirelessModem.FACTORY_NORMAL,
-            TileWirelessModem.FACTORY_ADVANCED,
-            TileWiredModemFull.FACTORY,
-            TileCable.FACTORY
-        );
+        registry.add( TileSpeaker.FACTORY.getId(), TileSpeaker.FACTORY );
+        registry.add( TileDiskDrive.FACTORY.getId(), TileDiskDrive.FACTORY );
+        registry.add( TilePrinter.FACTORY.getId(), TilePrinter.FACTORY );
+
+        registry.add( TileMonitor.FACTORY_NORMAL.getId(), TileMonitor.FACTORY_NORMAL );
+        registry.add( TileMonitor.FACTORY_ADVANCED.getId(), TileMonitor.FACTORY_ADVANCED );
+
+        registry.add( TileWirelessModem.FACTORY_NORMAL.getId(), TileWirelessModem.FACTORY_NORMAL );
+        registry.add( TileWirelessModem.FACTORY_ADVANCED.getId(), TileWirelessModem.FACTORY_ADVANCED );
+        registry.add( TileCable.FACTORY.getId(), TileCable.FACTORY );
+        registry.add( TileWiredModemFull.FACTORY.getId(), TileWiredModemFull.FACTORY );
     }
 
-    private static <T extends ItemBlock> T setupItemBlock( T item )
+    private static void registerItemBlock( MutableRegistry<Item> registry, BlockItem item )
     {
-        item.setRegistryName( item.getBlock().getRegistryName() );
-        return item;
+        registry.add( net.minecraft.util.registry.Registry.BLOCK.getId( item.getBlock() ), item );
     }
 
-    private static Item.Properties defaultItem()
+    private static Item.Settings defaultItem()
     {
-        return new Item.Properties().group( mainItemGroup );
+        return new Item.Settings().itemGroup( mainItemGroup );
     }
 
-    @SubscribeEvent
-    public static void registerItems( RegistryEvent.Register<Item> event )
+    public static void registerItems( MutableRegistry<Item> registry )
     {
-        IForgeRegistry<Item> registry = event.getRegistry();
-
         // Computer
         ComputerCraft.Items.computerNormal = new ItemComputer( ComputerCraft.Blocks.computerNormal, defaultItem() );
         ComputerCraft.Items.computerAdvanced = new ItemComputer( ComputerCraft.Blocks.computerAdvanced, defaultItem() );
         ComputerCraft.Items.computerCommand = new ItemComputer( ComputerCraft.Blocks.computerCommand, defaultItem() );
 
-        registry.registerAll(
-            setupItemBlock( ComputerCraft.Items.computerNormal ),
-            setupItemBlock( ComputerCraft.Items.computerAdvanced ),
-            setupItemBlock( ComputerCraft.Items.computerCommand )
-        );
+        registerItemBlock( registry, ComputerCraft.Items.computerNormal );
+        registerItemBlock( registry, ComputerCraft.Items.computerAdvanced );
+        registerItemBlock( registry, ComputerCraft.Items.computerCommand );
 
         // Turtle
         ComputerCraft.Items.turtleNormal = new ItemTurtle( ComputerCraft.Blocks.turtleNormal, defaultItem() );
         ComputerCraft.Items.turtleAdvanced = new ItemTurtle( ComputerCraft.Blocks.turtleAdvanced, defaultItem() );
-        registry.registerAll(
-            setupItemBlock( ComputerCraft.Items.turtleNormal ),
-            setupItemBlock( ComputerCraft.Items.turtleAdvanced )
-        );
+
+        registerItemBlock( registry, ComputerCraft.Items.turtleNormal );
+        registerItemBlock( registry, ComputerCraft.Items.turtleAdvanced );
 
         // Pocket computer
-        ComputerCraft.Items.pocketComputerNormal = new ItemPocketComputer( defaultItem().maxStackSize( 1 ), ComputerFamily.Normal );
-        ComputerCraft.Items.pocketComputerAdvanced = new ItemPocketComputer( defaultItem().maxStackSize( 1 ), ComputerFamily.Advanced );
+        ComputerCraft.Items.pocketComputerNormal = new ItemPocketComputer( defaultItem().stackSize( 1 ), ComputerFamily.Normal );
+        ComputerCraft.Items.pocketComputerAdvanced = new ItemPocketComputer( defaultItem().stackSize( 1 ), ComputerFamily.Advanced );
 
-        registry.registerAll(
-            ComputerCraft.Items.pocketComputerNormal.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "pocket_computer_normal" ) ),
-            ComputerCraft.Items.pocketComputerAdvanced.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "pocket_computer_advanced" ) )
-        );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "pocket_computer_normal" ), ComputerCraft.Items.pocketComputerNormal );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "pocket_computer_advanced" ), ComputerCraft.Items.pocketComputerAdvanced );
 
         // Floppy disk
-        ComputerCraft.Items.disk = new ItemDisk( defaultItem().maxStackSize( 1 ) );
-        ComputerCraft.Items.treasureDisk = new ItemTreasureDisk( defaultItem().maxStackSize( 1 ) );
+        ComputerCraft.Items.disk = new ItemDisk( defaultItem().stackSize( 1 ) );
+        ComputerCraft.Items.treasureDisk = new ItemTreasureDisk( defaultItem().stackSize( 1 ) );
 
-        registry.registerAll(
-            ComputerCraft.Items.disk.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "disk" ) ),
-            ComputerCraft.Items.treasureDisk.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "treasure_disk" ) )
-        );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "disk" ), ComputerCraft.Items.disk );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "treasure_disk" ), ComputerCraft.Items.treasureDisk );
 
         // Printouts
-        ComputerCraft.Items.printedPage = new ItemPrintout( defaultItem().maxStackSize( 1 ), ItemPrintout.Type.PAGE );
-        ComputerCraft.Items.printedPages = new ItemPrintout( defaultItem().maxStackSize( 1 ), ItemPrintout.Type.PAGES );
-        ComputerCraft.Items.printedBook = new ItemPrintout( defaultItem().maxStackSize( 1 ), ItemPrintout.Type.BOOK );
+        ComputerCraft.Items.printedPage = new ItemPrintout( defaultItem().stackSize( 1 ), ItemPrintout.Type.PAGE );
+        ComputerCraft.Items.printedPages = new ItemPrintout( defaultItem().stackSize( 1 ), ItemPrintout.Type.PAGES );
+        ComputerCraft.Items.printedBook = new ItemPrintout( defaultItem().stackSize( 1 ), ItemPrintout.Type.BOOK );
 
-        registry.registerAll(
-            ComputerCraft.Items.printedPage.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "printed_page" ) ),
-            ComputerCraft.Items.printedPages.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "printed_pages" ) ),
-            ComputerCraft.Items.printedBook.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "printed_book" ) )
-        );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "printed_page" ), ComputerCraft.Items.printedPage );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "printed_pages" ), ComputerCraft.Items.printedPages );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "printed_book" ), ComputerCraft.Items.printedBook );
 
         // Peripherals
-        registry.registerAll(
-            setupItemBlock( new ItemBlock( ComputerCraft.Blocks.speaker, defaultItem() ) ),
-            setupItemBlock( new ItemBlock( ComputerCraft.Blocks.diskDrive, defaultItem() ) ),
-            setupItemBlock( new ItemBlock( ComputerCraft.Blocks.printer, defaultItem() ) ),
-            setupItemBlock( new ItemBlock( ComputerCraft.Blocks.monitorNormal, defaultItem() ) ),
-            setupItemBlock( new ItemBlock( ComputerCraft.Blocks.monitorAdvanced, defaultItem() ) ),
-            setupItemBlock( new ItemBlock( ComputerCraft.Blocks.wirelessModemNormal, defaultItem() ) ),
-            setupItemBlock( new ItemBlock( ComputerCraft.Blocks.wirelessModemAdvanced, defaultItem() ) ),
-            setupItemBlock( new ItemBlock( ComputerCraft.Blocks.wiredModemFull, defaultItem() ) )
-        );
+        registerItemBlock( registry, new BlockItem( ComputerCraft.Blocks.speaker, defaultItem() ) );
+        registerItemBlock( registry, new BlockItem( ComputerCraft.Blocks.diskDrive, defaultItem() ) );
+        registerItemBlock( registry, new BlockItem( ComputerCraft.Blocks.printer, defaultItem() ) );
+        registerItemBlock( registry, new BlockItem( ComputerCraft.Blocks.monitorNormal, defaultItem() ) );
+        registerItemBlock( registry, new BlockItem( ComputerCraft.Blocks.monitorAdvanced, defaultItem() ) );
+        registerItemBlock( registry, new BlockItem( ComputerCraft.Blocks.wirelessModemNormal, defaultItem() ) );
+        registerItemBlock( registry, new BlockItem( ComputerCraft.Blocks.wirelessModemAdvanced, defaultItem() ) );
+        registerItemBlock( registry, new BlockItem( ComputerCraft.Blocks.wiredModemFull, defaultItem() ) );
 
         ComputerCraft.Items.cable = new ItemBlockCable.Cable( ComputerCraft.Blocks.cable, defaultItem() );
         ComputerCraft.Items.wiredModem = new ItemBlockCable.WiredModem( ComputerCraft.Blocks.cable, defaultItem() );
-        registry.registerAll(
-            ComputerCraft.Items.cable.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "cable" ) ),
-            ComputerCraft.Items.wiredModem.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "wired_modem" ) )
-        );
+
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "cable" ), ComputerCraft.Items.cable );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "wired_modem" ), ComputerCraft.Items.wiredModem );
 
         registerTurtleUpgrades();
         registerPocketUpgrades();
@@ -271,31 +251,31 @@ public final class Registry
     private static void registerTurtleUpgrades()
     {
         // Upgrades
-        ComputerCraft.TurtleUpgrades.wirelessModemNormal = new TurtleModem( false, new ResourceLocation( ComputerCraft.MOD_ID, "wireless_modem_normal" ) );
-        TurtleUpgrades.register( ComputerCraft.TurtleUpgrades.wirelessModemNormal );
+        ComputerCraft.TurtleUpgrades.wirelessModemNormal = new TurtleModem( false, new Identifier( ComputerCraft.MOD_ID, "wireless_modem_normal" ) );
+        ComputerCraftAPI.registerTurtleUpgrade( ComputerCraft.TurtleUpgrades.wirelessModemNormal );
 
-        ComputerCraft.TurtleUpgrades.wirelessModemAdvanced = new TurtleModem( true, new ResourceLocation( ComputerCraft.MOD_ID, "wireless_modem_advanced" ) );
+        ComputerCraft.TurtleUpgrades.wirelessModemAdvanced = new TurtleModem( true, new Identifier( ComputerCraft.MOD_ID, "wireless_modem_advanced" ) );
         ComputerCraftAPI.registerTurtleUpgrade( ComputerCraft.TurtleUpgrades.wirelessModemAdvanced );
 
-        ComputerCraft.TurtleUpgrades.speaker = new TurtleSpeaker( new ResourceLocation( ComputerCraft.MOD_ID, "speaker" ) );
+        ComputerCraft.TurtleUpgrades.speaker = new TurtleSpeaker( new Identifier( ComputerCraft.MOD_ID, "speaker" ) );
         ComputerCraftAPI.registerTurtleUpgrade( ComputerCraft.TurtleUpgrades.speaker );
 
-        ComputerCraft.TurtleUpgrades.craftingTable = new TurtleCraftingTable( new ResourceLocation( "minecraft", "crafting_table" ) );
+        ComputerCraft.TurtleUpgrades.craftingTable = new TurtleCraftingTable( new Identifier( "minecraft", "crafting_table" ) );
         ComputerCraftAPI.registerTurtleUpgrade( ComputerCraft.TurtleUpgrades.craftingTable );
 
-        ComputerCraft.TurtleUpgrades.diamondSword = new TurtleSword( new ResourceLocation( "minecraft", "diamond_sword" ), Items.DIAMOND_SWORD );
+        ComputerCraft.TurtleUpgrades.diamondSword = new TurtleSword( new Identifier( "minecraft", "diamond_sword" ), Items.DIAMOND_SWORD );
         ComputerCraftAPI.registerTurtleUpgrade( ComputerCraft.TurtleUpgrades.diamondSword );
 
-        ComputerCraft.TurtleUpgrades.diamondShovel = new TurtleShovel( new ResourceLocation( "minecraft", "diamond_shovel" ), Items.DIAMOND_SHOVEL );
+        ComputerCraft.TurtleUpgrades.diamondShovel = new TurtleShovel( new Identifier( "minecraft", "diamond_shovel" ), Items.DIAMOND_SHOVEL );
         ComputerCraftAPI.registerTurtleUpgrade( ComputerCraft.TurtleUpgrades.diamondShovel );
 
-        ComputerCraft.TurtleUpgrades.diamondPickaxe = new TurtleTool( new ResourceLocation( "minecraft", "diamond_pickaxe" ), Items.DIAMOND_PICKAXE );
+        ComputerCraft.TurtleUpgrades.diamondPickaxe = new TurtleTool( new Identifier( "minecraft", "diamond_pickaxe" ), Items.DIAMOND_PICKAXE );
         ComputerCraftAPI.registerTurtleUpgrade( ComputerCraft.TurtleUpgrades.diamondPickaxe );
 
-        ComputerCraft.TurtleUpgrades.diamondAxe = new TurtleAxe( new ResourceLocation( "minecraft", "diamond_axe" ), Items.DIAMOND_AXE );
+        ComputerCraft.TurtleUpgrades.diamondAxe = new TurtleAxe( new Identifier( "minecraft", "diamond_axe" ), Items.DIAMOND_AXE );
         ComputerCraftAPI.registerTurtleUpgrade( ComputerCraft.TurtleUpgrades.diamondAxe );
 
-        ComputerCraft.TurtleUpgrades.diamondHoe = new TurtleHoe( new ResourceLocation( "minecraft", "diamond_hoe" ), Items.DIAMOND_HOE );
+        ComputerCraft.TurtleUpgrades.diamondHoe = new TurtleHoe( new Identifier( "minecraft", "diamond_hoe" ), Items.DIAMOND_HOE );
         ComputerCraftAPI.registerTurtleUpgrade( ComputerCraft.TurtleUpgrades.diamondHoe );
     }
 
@@ -306,9 +286,16 @@ public final class Registry
         ComputerCraftAPI.registerPocketUpgrade( ComputerCraft.PocketUpgrades.speaker = new PocketSpeaker() );
     }
 
-    @SubscribeEvent
-    public static void registerEntities( RegistryEvent.Register<EntityType<?>> registry )
+    public static void registerRecipes( MutableRegistry<RecipeSerializer<?>> registry )
     {
-        registry.getRegistry().register( TurtlePlayer.TYPE.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "turtle_player" ) ) );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "colour" ), ColourableRecipe.SERIALIZER );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "computer_upgrade" ), ComputerUpgradeRecipe.SERIALIZER );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "pocket_computer_upgrade" ), PocketComputerUpgradeRecipe.SERIALIZER );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "disk" ), DiskRecipe.SERIALIZER );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "printout" ), PrintoutRecipe.SERIALIZER );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "turtle" ), TurtleRecipe.SERIALIZER );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "turtle_upgrade" ), TurtleUpgradeRecipe.SERIALIZER );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "impostor_shaped" ), ImpostorRecipe.SERIALIZER );
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "impostor_shapeless" ), ImpostorShapelessRecipe.SERIALIZER );
     }
 }

src/main/java/dan200/computercraft/shared/TurtlePermissions.java

@@ -6,32 +6,30 @@
 
 package dan200.computercraft.shared;
 
+import com.google.common.eventbus.Subscribe;
 import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.api.turtle.event.TurtleActionEvent;
-import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.World;
-import net.minecraftforge.eventbus.api.SubscribeEvent;
-import net.minecraftforge.fml.common.Mod;
 
-@Mod.EventBusSubscriber( modid = ComputerCraft.MOD_ID )
 public final class TurtlePermissions
 {
-    public static boolean isBlockEnterable( World world, BlockPos pos, EntityPlayer player )
+    public static boolean isBlockEnterable( World world, BlockPos pos, PlayerEntity player )
     {
         MinecraftServer server = world.getServer();
-        return server == null || world.isRemote || !server.isBlockProtected( world, pos, player );
+        return server == null || world.isClient || !server.isSpawnProtected( world, pos, player );
     }
 
-    public static boolean isBlockEditable( World world, BlockPos pos, EntityPlayer player )
+    public static boolean isBlockEditable( World world, BlockPos pos, PlayerEntity player )
     {
         MinecraftServer server = world.getServer();
-        return server == null || world.isRemote || !server.isBlockProtected( world, pos, player );
+        return server == null || world.isClient || !server.isSpawnProtected( world, pos, player );
     }
 
-    @SubscribeEvent
-    public static void onTurtleAction( TurtleActionEvent event )
+    @Subscribe
+    public void onTurtleAction( TurtleActionEvent event )
     {
         if( ComputerCraft.turtleDisabledActions.contains( event.getAction() ) )
         {

src/main/java/dan200/computercraft/shared/TurtleUpgrades.java

@@ -11,17 +11,13 @@ import dan200.computercraft.api.turtle.ITurtleUpgrade;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
 import dan200.computercraft.shared.util.InventoryUtil;
 import net.minecraft.item.ItemStack;
-import net.minecraftforge.fml.ModContainer;
-import net.minecraftforge.fml.ModLoadingContext;
 
 import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
 import java.util.*;
 
 public final class TurtleUpgrades
 {
     private static final Map<String, ITurtleUpgrade> upgrades = new HashMap<>();
-    private static final IdentityHashMap<ITurtleUpgrade, String> upgradeOwners = new IdentityHashMap<>();
 
     private TurtleUpgrades() {}
 
@@ -37,9 +33,6 @@ public final class TurtleUpgrades
         }
 
         upgrades.put( id, upgrade );
-
-        ModContainer mc = ModLoadingContext.get().getActiveContainer();
-        if( mc != null && mc.getModId() != null ) upgradeOwners.put( upgrade, mc.getModId() );
     }
 
 
@@ -84,12 +77,6 @@ public final class TurtleUpgrades
         return vanilla;
     }
 
-    @Nullable
-    public static String getOwner( @Nonnull ITurtleUpgrade upgrade )
-    {
-        return upgradeOwners.get( upgrade );
-    }
-
     public static Iterable<ITurtleUpgrade> getUpgrades()
     {
         return Collections.unmodifiableCollection( upgrades.values() );

src/main/java/dan200/computercraft/shared/command/CommandComputerCraft.java

@@ -21,16 +21,15 @@ import dan200.computercraft.shared.command.text.TableBuilder;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
 import dan200.computercraft.shared.computer.core.ServerComputer;
 import dan200.computercraft.shared.network.Containers;
-import net.minecraft.command.CommandSource;
 import net.minecraft.entity.Entity;
-import net.minecraft.entity.player.EntityPlayer;
-import net.minecraft.entity.player.EntityPlayerMP;
-import net.minecraft.network.play.server.SPacketPlayerPosLook;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.network.chat.Component;
+import net.minecraft.network.chat.TextComponent;
+import net.minecraft.server.command.ServerCommandSource;
+import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.server.world.ServerWorld;
 import net.minecraft.util.math.BlockPos;
-import net.minecraft.util.text.ITextComponent;
-import net.minecraft.util.text.TextComponentString;
 import net.minecraft.world.World;
-import net.minecraft.world.WorldServer;
 
 import javax.annotation.Nonnull;
 import java.util.*;
@@ -45,7 +44,7 @@ import static dan200.computercraft.shared.command.builder.CommandBuilder.args;
 import static dan200.computercraft.shared.command.builder.CommandBuilder.command;
 import static dan200.computercraft.shared.command.builder.HelpingArgumentBuilder.choice;
 import static dan200.computercraft.shared.command.text.ChatHelpers.*;
-import static net.minecraft.command.Commands.literal;
+import static net.minecraft.server.command.CommandManager.literal;
 
 public final class CommandComputerCraft
 {
@@ -59,7 +58,7 @@ public final class CommandComputerCraft
     {
     }
 
-    public static void register( CommandDispatcher<CommandSource> dispatcher )
+    public static void register( CommandDispatcher<ServerCommandSource> dispatcher )
     {
         dispatcher.register( choice( "computercraft" )
             .then( literal( "dump" )
@@ -67,17 +66,17 @@ public final class CommandComputerCraft
                 .executes( context -> {
                     TableBuilder table = new TableBuilder( DUMP_LIST_ID, "Computer", "On", "Position" );
 
-                    CommandSource source = context.getSource();
+                    ServerCommandSource source = context.getSource();
                     List<ServerComputer> computers = new ArrayList<>( ComputerCraft.serverComputerRegistry.getComputers() );
 
                     // Unless we're on a server, limit the number of rows we can send.
                     World world = source.getWorld();
-                    BlockPos pos = new BlockPos( source.getPos() );
+                    BlockPos pos = new BlockPos( source.getPosition() );
 
                     computers.sort( ( a, b ) -> {
                         if( a.getWorld() == b.getWorld() && a.getWorld() == world )
                         {
-                            return Double.compare( a.getPosition().distanceSq( pos ), b.getPosition().distanceSq( pos ) );
+                            return Double.compare( a.getPosition().getSquaredDistance( pos ), b.getPosition().getSquaredDistance( pos ) );
                         }
                         else if( a.getWorld() == world )
                         {
@@ -169,17 +168,17 @@ public final class CommandComputerCraft
 
                     if( world == null || pos == null ) throw TP_NOT_THERE.create();
 
-                    Entity entity = context.getSource().assertIsEntity();
-                    if( !(entity instanceof EntityPlayerMP) ) throw TP_NOT_PLAYER.create();
+                    Entity entity = context.getSource().getEntityOrThrow();
+                    if( !(entity instanceof ServerPlayerEntity) ) throw TP_NOT_PLAYER.create();
 
-                    EntityPlayerMP player = (EntityPlayerMP) entity;
+                    ServerPlayerEntity player = (ServerPlayerEntity) entity;
                     if( player.getEntityWorld() == world )
                     {
-                        player.connection.setPlayerLocation( pos.getX() + 0.5, pos.getY(), pos.getZ() + 0.5, 0, 0, EnumSet.noneOf( SPacketPlayerPosLook.EnumFlags.class ) );
+                        player.networkHandler.teleportRequest( pos.getX() + 0.5, pos.getY(), pos.getZ() + 0.5, 0, 0, Collections.emptySet() );
                     }
                     else
                     {
-                        player.teleport( (WorldServer) world, pos.getX() + 0.5, pos.getY(), pos.getZ() + 0.5, 0, 0 );
+                        player.teleport( (ServerWorld) world, pos.getX() + 0.5, pos.getY(), pos.getZ() + 0.5, 0, 0 );
                     }
 
                     return 1;
@@ -210,7 +209,7 @@ public final class CommandComputerCraft
                 .requires( UserLevel.OP )
                 .arg( "computer", oneComputer() )
                 .executes( context -> {
-                    EntityPlayerMP player = context.getSource().asPlayer();
+                    ServerPlayerEntity player = context.getSource().getPlayer();
                     ServerComputer computer = getComputerArgument( context, "computer" );
                     Containers.openComputerGUI( player, computer );
                     return 1;
@@ -257,18 +256,18 @@ public final class CommandComputerCraft
         );
     }
 
-    private static ITextComponent linkComputer( CommandSource source, ServerComputer serverComputer, int computerId )
+    private static Component linkComputer( ServerCommandSource source, ServerComputer serverComputer, int computerId )
     {
-        ITextComponent out = new TextComponentString( "" );
+        TextComponent out = new TextComponent( "" );
 
         // Append the computer instance
         if( serverComputer == null )
         {
-            out.appendSibling( text( "?" ) );
+            out.append( text( "?" ) );
         }
         else
         {
-            out.appendSibling( link(
+            out.append( link(
                 text( Integer.toString( serverComputer.getInstanceID() ) ),
                 "/computercraft dump " + serverComputer.getInstanceID(),
                 translate( "commands.computercraft.dump.action" )
@@ -276,20 +275,20 @@ public final class CommandComputerCraft
         }
 
         // And ID
-        out.appendText( " (id " + computerId + ")" );
+        out.append( " (id " + computerId + ")" );
 
         // And, if we're a player, some useful links
         if( serverComputer != null && UserLevel.OP.test( source ) && isPlayer( source ) )
         {
             out
-                .appendText( " " )
-                .appendSibling( link(
+                .append( " " )
+                .append( link(
                     text( "\u261b" ),
                     "/computercraft tp " + serverComputer.getInstanceID(),
                     translate( "commands.computercraft.tp.action" )
                 ) )
-                .appendText( " " )
-                .appendSibling( link(
+                .append( " " )
+                .append( link(
                     text( "\u20e2" ),
                     "/computercraft view " + serverComputer.getInstanceID(),
                     translate( "commands.computercraft.view.action" )
@@ -299,7 +298,7 @@ public final class CommandComputerCraft
         return out;
     }
 
-    private static ITextComponent linkPosition( CommandSource context, ServerComputer computer )
+    private static Component linkPosition( ServerCommandSource context, ServerComputer computer )
     {
         if( UserLevel.OP.test( context ) )
         {
@@ -316,20 +315,20 @@ public final class CommandComputerCraft
     }
 
     @Nonnull
-    private static TrackingContext getTimingContext( CommandSource source )
+    private static TrackingContext getTimingContext( ServerCommandSource source )
     {
         Entity entity = source.getEntity();
-        return entity instanceof EntityPlayer ? Tracking.getContext( entity.getUniqueID() ) : Tracking.getContext( SYSTEM_UUID );
+        return entity instanceof PlayerEntity ? Tracking.getContext( entity.getUuid() ) : Tracking.getContext( SYSTEM_UUID );
     }
 
     private static final List<TrackingField> DEFAULT_FIELDS = Arrays.asList( TrackingField.TASKS, TrackingField.TOTAL_TIME, TrackingField.AVERAGE_TIME, TrackingField.MAX_TIME );
 
-    private static int displayTimings( CommandSource source, TrackingField sortField, List<TrackingField> fields ) throws CommandSyntaxException
+    private static int displayTimings( ServerCommandSource source, TrackingField sortField, List<TrackingField> fields ) throws CommandSyntaxException
     {
         return displayTimings( source, getTimingContext( source ).getTimings(), sortField, fields );
     }
 
-    private static int displayTimings( CommandSource source, @Nonnull List<ComputerTracker> timings, @Nonnull TrackingField sortField, @Nonnull List<TrackingField> fields ) throws CommandSyntaxException
+    private static int displayTimings( ServerCommandSource source, @Nonnull List<ComputerTracker> timings, @Nonnull TrackingField sortField, @Nonnull List<TrackingField> fields ) throws CommandSyntaxException
     {
         if( timings.isEmpty() ) throw NO_TIMINGS_EXCEPTION.create();
 
@@ -345,7 +344,7 @@ public final class CommandComputerCraft
 
         timings.sort( Comparator.<ComputerTracker, Long>comparing( x -> x.get( sortField ) ).reversed() );
 
-        ITextComponent[] headers = new ITextComponent[1 + fields.size()];
+        Component[] headers = new Component[1 + fields.size()];
         headers[0] = translate( "commands.computercraft.track.dump.computer" );
         for( int i = 0; i < fields.size(); i++ ) headers[i + 1] = translate( fields.get( i ).translationKey() );
         TableBuilder table = new TableBuilder( TRACK_ID, headers );
@@ -355,9 +354,9 @@ public final class CommandComputerCraft
             Computer computer = entry.getComputer();
             ServerComputer serverComputer = computer == null ? null : lookup.get( computer );
 
-            ITextComponent computerComponent = linkComputer( source, serverComputer, entry.getComputerId() );
+            Component computerComponent = linkComputer( source, serverComputer, entry.getComputerId() );
 
-            ITextComponent[] row = new ITextComponent[1 + fields.size()];
+            Component[] row = new Component[1 + fields.size()];
             row[0] = computerComponent;
             for( int i = 0; i < fields.size(); i++ ) row[i + 1] = text( entry.getFormatted( fields.get( i ) ) );
             table.row( row );

src/main/java/dan200/computercraft/shared/command/CommandCopy.java

@@ -8,23 +8,16 @@ package dan200.computercraft.shared.command;
 
 import com.mojang.brigadier.CommandDispatcher;
 import com.mojang.brigadier.arguments.StringArgumentType;
-import dan200.computercraft.ComputerCraft;
-import net.minecraft.client.Minecraft;
-import net.minecraft.command.CommandSource;
-import net.minecraft.util.text.ITextComponent;
-import net.minecraft.util.text.TextComponentString;
-import net.minecraft.util.text.TextComponentTranslation;
-import net.minecraft.util.text.event.ClickEvent;
-import net.minecraft.util.text.event.HoverEvent;
-import net.minecraftforge.api.distmarker.Dist;
-import net.minecraftforge.client.event.ClientChatEvent;
-import net.minecraftforge.eventbus.api.SubscribeEvent;
-import net.minecraftforge.fml.common.Mod;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.network.chat.ClickEvent;
+import net.minecraft.network.chat.HoverEvent;
+import net.minecraft.network.chat.TextComponent;
+import net.minecraft.network.chat.TranslatableComponent;
+import net.minecraft.server.command.ServerCommandSource;
 
-import static net.minecraft.command.Commands.argument;
-import static net.minecraft.command.Commands.literal;
+import static net.minecraft.server.command.CommandManager.argument;
+import static net.minecraft.server.command.CommandManager.literal;
 
-@Mod.EventBusSubscriber( modid = ComputerCraft.MOD_ID, value = Dist.CLIENT )
 public final class CommandCopy
 {
     private static final String PREFIX = "/computercraft copy ";
@@ -33,35 +26,36 @@ public final class CommandCopy
     {
     }
 
-    public static void register( CommandDispatcher<CommandSource> registry )
+    public static void register( CommandDispatcher<ServerCommandSource> registry )
     {
         registry.register( literal( "computercraft" )
             .then( literal( "copy" ) )
             .then( argument( "message", StringArgumentType.greedyString() ) )
             .executes( context -> {
-                Minecraft.getInstance().keyboardListener.setClipboardString( context.getArgument( "message", String.class ) );
+                MinecraftClient.getInstance().keyboard.setClipboard( context.getArgument( "message", String.class ) );
                 return 1;
             } )
         );
     }
 
-    @SubscribeEvent
-    public static void onClientSendMessage( ClientChatEvent event )
+    public static boolean onClientSendMessage( String message )
     {
         // Emulate the command on the client side
-        if( event.getMessage().startsWith( PREFIX ) )
+        if( message.startsWith( PREFIX ) )
         {
-            Minecraft.getInstance().keyboardListener.setClipboardString( event.getMessage().substring( PREFIX.length() ) );
-            event.setCanceled( true );
+            MinecraftClient.getInstance().keyboard.setClipboard( message.substring( PREFIX.length() ) );
+            return true;
         }
+
+        return false;
     }
 
-    public static ITextComponent createCopyText( String text )
+    public static TextComponent createCopyText( String text )
     {
-        TextComponentString name = new TextComponentString( text );
+        TextComponent name = new TextComponent( text );
         name.getStyle()
             .setClickEvent( new ClickEvent( ClickEvent.Action.RUN_COMMAND, PREFIX + text ) )
-            .setHoverEvent( new HoverEvent( HoverEvent.Action.SHOW_TEXT, new TextComponentTranslation( "gui.computercraft.tooltip.copy" ) ) );
+            .setHoverEvent( new HoverEvent( HoverEvent.Action.SHOW_TEXT, new TranslatableComponent( "gui.computercraft.tooltip.copy" ) ) );
         return name;
     }
 }

src/main/java/dan200/computercraft/shared/command/CommandUtils.java

@@ -9,11 +9,11 @@ package dan200.computercraft.shared.command;
 import com.mojang.brigadier.context.CommandContext;
 import com.mojang.brigadier.suggestion.Suggestions;
 import com.mojang.brigadier.suggestion.SuggestionsBuilder;
-import net.minecraft.command.CommandSource;
-import net.minecraft.command.ISuggestionProvider;
+import dan200.computercraft.api.turtle.event.FakePlayer;
 import net.minecraft.entity.Entity;
-import net.minecraft.entity.player.EntityPlayerMP;
-import net.minecraftforge.common.util.FakePlayer;
+import net.minecraft.server.command.CommandSource;
+import net.minecraft.server.command.ServerCommandSource;
+import net.minecraft.server.network.ServerPlayerEntity;
 
 import java.util.Arrays;
 import java.util.Locale;
@@ -24,29 +24,29 @@ public final class CommandUtils
 {
     private CommandUtils() {}
 
-    public static boolean isPlayer( CommandSource output )
+    public static boolean isPlayer( ServerCommandSource output )
     {
         Entity sender = output.getEntity();
-        return sender instanceof EntityPlayerMP
+        return sender instanceof ServerPlayerEntity
             && !(sender instanceof FakePlayer)
-            && ((EntityPlayerMP) sender).connection != null;
+            && ((ServerPlayerEntity) sender).networkHandler != null;
     }
 
     @SuppressWarnings( "unchecked" )
-    public static CompletableFuture<Suggestions> suggestOnServer( CommandContext<?> context, SuggestionsBuilder builder, Function<CommandContext<CommandSource>, CompletableFuture<Suggestions>> supplier )
+    public static CompletableFuture<Suggestions> suggestOnServer( CommandContext<?> context, SuggestionsBuilder builder, Function<CommandContext<ServerCommandSource>, CompletableFuture<Suggestions>> supplier )
     {
         Object source = context.getSource();
-        if( !(source instanceof ISuggestionProvider) )
+        if( !(source instanceof CommandSource) )
         {
             return Suggestions.empty();
         }
-        else if( source instanceof CommandSource )
+        else if( source instanceof ServerCommandSource )
         {
-            return supplier.apply( (CommandContext<CommandSource>) context );
+            return supplier.apply( (CommandContext<ServerCommandSource>) context );
         }
         else
         {
-            return ((ISuggestionProvider) source).getSuggestionsFromServer( (CommandContext<ISuggestionProvider>) context, builder );
+            return ((CommandSource) source).getCompletions( (CommandContext<CommandSource>) context, builder );
         }
     }
 

src/main/java/dan200/computercraft/shared/command/Exceptions.java

@@ -9,7 +9,7 @@ package dan200.computercraft.shared.command;
 import com.mojang.brigadier.exceptions.Dynamic2CommandExceptionType;
 import com.mojang.brigadier.exceptions.DynamicCommandExceptionType;
 import com.mojang.brigadier.exceptions.SimpleCommandExceptionType;
-import net.minecraft.util.text.TextComponentTranslation;
+import net.minecraft.network.chat.TranslatableComponent;
 
 public final class Exceptions
 {
@@ -28,16 +28,16 @@ public final class Exceptions
 
     private static SimpleCommandExceptionType translated( String key )
     {
-        return new SimpleCommandExceptionType( new TextComponentTranslation( key ) );
+        return new SimpleCommandExceptionType( new TranslatableComponent( key ) );
     }
 
     private static DynamicCommandExceptionType translated1( String key )
     {
-        return new DynamicCommandExceptionType( x -> new TextComponentTranslation( key, x ) );
+        return new DynamicCommandExceptionType( x -> new TranslatableComponent( key, x ) );
     }
 
     private static Dynamic2CommandExceptionType translated2( String key )
     {
-        return new Dynamic2CommandExceptionType( ( x, y ) -> new TextComponentTranslation( key, x, y ) );
+        return new Dynamic2CommandExceptionType( ( x, y ) -> new TranslatableComponent( key, x, y ) );
     }
 }

src/main/java/dan200/computercraft/shared/command/UserLevel.java

@@ -6,17 +6,17 @@
 
 package dan200.computercraft.shared.command;
 
-import net.minecraft.command.CommandSource;
 import net.minecraft.entity.Entity;
-import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.command.ServerCommandSource;
 
 import java.util.function.Predicate;
 
 /**
  * The level a user must be at in order to execute a command.
  */
-public enum UserLevel implements Predicate<CommandSource>
+public enum UserLevel implements Predicate<ServerCommandSource>
 {
     /**
      * Only can be used by the owner of the server: namely the server console or the player in SSP.
@@ -54,16 +54,16 @@ public enum UserLevel implements Predicate<CommandSource>
     }
 
     @Override
-    public boolean test( CommandSource source )
+    public boolean test( ServerCommandSource source )
     {
         if( this == ANYONE ) return true;
 
         // We *always* allow level 0 stuff, even if the
-        MinecraftServer server = source.getServer();
+        MinecraftServer server = source.getMinecraftServer();
         Entity sender = source.getEntity();
 
-        if( server.isSinglePlayer() && sender instanceof EntityPlayer &&
-            ((EntityPlayer) sender).getGameProfile().getName().equalsIgnoreCase( server.getServerModName() ) )
+        if( server.isSinglePlayer() && sender instanceof PlayerEntity &&
+            ((PlayerEntity) sender).getGameProfile().getName().equalsIgnoreCase( server.getUserName() ) )
         {
             if( this == OWNER || this == OWNER_OP ) return true;
         }

src/main/java/dan200/computercraft/shared/command/arguments/ArgumentSerializers.java

@@ -8,34 +8,34 @@ package dan200.computercraft.shared.command.arguments;
 
 import com.mojang.brigadier.arguments.ArgumentType;
 import dan200.computercraft.ComputerCraft;
-import net.minecraft.command.arguments.ArgumentSerializer;
 import net.minecraft.command.arguments.ArgumentTypes;
-import net.minecraft.command.arguments.IArgumentSerializer;
-import net.minecraft.util.ResourceLocation;
+import net.minecraft.command.arguments.serialize.ArgumentSerializer;
+import net.minecraft.command.arguments.serialize.ConstantArgumentSerializer;
+import net.minecraft.util.Identifier;
 
 public final class ArgumentSerializers
 {
     @SuppressWarnings( "unchecked" )
-    private static <T extends ArgumentType<?>> void registerUnsafe( ResourceLocation id, Class<T> type, IArgumentSerializer<?> serializer )
+    private static <T extends ArgumentType<?>> void registerUnsafe( Identifier id, Class<T> type, ArgumentSerializer<?> serializer )
     {
-        ArgumentTypes.register( id, type, (IArgumentSerializer<T>) serializer );
+        ArgumentTypes.register( id.toString(), type, (ArgumentSerializer<T>) serializer );
     }
 
-    private static <T extends ArgumentType<?>> void register( ResourceLocation id, Class<T> type, IArgumentSerializer<T> serializer )
+    private static <T extends ArgumentType<?>> void register( Identifier id, Class<T> type, ArgumentSerializer<T> serializer )
     {
-        ArgumentTypes.register( id, type, serializer );
+        ArgumentTypes.register( id.toString(), type, serializer );
     }
 
-    private static <T extends ArgumentType<?>> void register( ResourceLocation id, T instance )
+    private static <T extends ArgumentType<?>> void register( Identifier id, T instance )
     {
-        registerUnsafe( id, instance.getClass(), new ArgumentSerializer<>( () -> instance ) );
+        registerUnsafe( id, instance.getClass(), new ConstantArgumentSerializer<>( () -> instance ) );
     }
 
     public static void register()
     {
-        register( new ResourceLocation( ComputerCraft.MOD_ID, "tracking_field" ), TrackingFieldArgumentType.trackingField() );
-        register( new ResourceLocation( ComputerCraft.MOD_ID, "computer" ), ComputerArgumentType.oneComputer() );
-        register( new ResourceLocation( ComputerCraft.MOD_ID, "computers" ), ComputersArgumentType.class, new ComputersArgumentType.Serializer() );
-        registerUnsafe( new ResourceLocation( ComputerCraft.MOD_ID, "repeat" ), RepeatArgumentType.class, new RepeatArgumentType.Serializer() );
+        register( new Identifier( ComputerCraft.MOD_ID, "tracking_field" ), TrackingFieldArgumentType.trackingField() );
+        register( new Identifier( ComputerCraft.MOD_ID, "computer" ), ComputerArgumentType.oneComputer() );
+        register( new Identifier( ComputerCraft.MOD_ID, "computers" ), ComputersArgumentType.class, new ComputersArgumentType.Serializer() );
+        registerUnsafe( new Identifier( ComputerCraft.MOD_ID, "repeat" ), RepeatArgumentType.class, new RepeatArgumentType.Serializer() );
     }
 }

src/main/java/dan200/computercraft/shared/command/arguments/ComputerArgumentType.java

@@ -14,7 +14,7 @@ import com.mojang.brigadier.suggestion.Suggestions;
 import com.mojang.brigadier.suggestion.SuggestionsBuilder;
 import dan200.computercraft.shared.command.arguments.ComputersArgumentType.ComputersSupplier;
 import dan200.computercraft.shared.computer.core.ServerComputer;
-import net.minecraft.command.CommandSource;
+import net.minecraft.server.command.ServerCommandSource;
 
 import java.util.Collection;
 import java.util.concurrent.CompletableFuture;
@@ -30,7 +30,7 @@ public final class ComputerArgumentType implements ArgumentType<ComputerArgument
         return INSTANCE;
     }
 
-    public static ServerComputer getComputerArgument( CommandContext<CommandSource> context, String name ) throws CommandSyntaxException
+    public static ServerComputer getComputerArgument( CommandContext<ServerCommandSource> context, String name ) throws CommandSyntaxException
     {
         return context.getArgument( name, ComputerSupplier.class ).unwrap( context.getSource() );
     }
@@ -89,6 +89,6 @@ public final class ComputerArgumentType implements ArgumentType<ComputerArgument
     @FunctionalInterface
     public interface ComputerSupplier
     {
-        ServerComputer unwrap( CommandSource source ) throws CommandSyntaxException;
+        ServerComputer unwrap( ServerCommandSource source ) throws CommandSyntaxException;
     }
 }

src/main/java/dan200/computercraft/shared/command/arguments/ComputersArgumentType.java

@@ -16,9 +16,9 @@ import com.mojang.brigadier.suggestion.SuggestionsBuilder;
 import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
 import dan200.computercraft.shared.computer.core.ServerComputer;
-import net.minecraft.command.CommandSource;
-import net.minecraft.command.arguments.IArgumentSerializer;
-import net.minecraft.network.PacketBuffer;
+import net.minecraft.command.arguments.serialize.ArgumentSerializer;
+import net.minecraft.server.command.ServerCommandSource;
+import net.minecraft.util.PacketByteBuf;
 
 import javax.annotation.Nonnull;
 import java.util.*;
@@ -50,7 +50,7 @@ public final class ComputersArgumentType implements ArgumentType<ComputersArgume
         return SOME;
     }
 
-    public static Collection<ServerComputer> getComputersArgument( CommandContext<CommandSource> context, String name ) throws CommandSyntaxException
+    public static Collection<ServerComputer> getComputersArgument( CommandContext<ServerCommandSource> context, String name ) throws CommandSyntaxException
     {
         return context.getArgument( name, ComputersSupplier.class ).unwrap( context.getSource() );
     }
@@ -172,24 +172,24 @@ public final class ComputersArgumentType implements ArgumentType<ComputersArgume
         );
     }
 
-    public static class Serializer implements IArgumentSerializer<ComputersArgumentType>
+    public static class Serializer implements ArgumentSerializer<ComputersArgumentType>
     {
 
         @Override
-        public void write( @Nonnull ComputersArgumentType arg, @Nonnull PacketBuffer buf )
+        public void toPacket( @Nonnull ComputersArgumentType arg, @Nonnull PacketByteBuf buf )
         {
             buf.writeBoolean( arg.requireSome );
         }
 
         @Nonnull
         @Override
-        public ComputersArgumentType read( @Nonnull PacketBuffer buf )
+        public ComputersArgumentType fromPacket( @Nonnull PacketByteBuf buf )
         {
             return buf.readBoolean() ? SOME : MANY;
         }
 
         @Override
-        public void write( @Nonnull ComputersArgumentType arg, @Nonnull JsonObject json )
+        public void toJson( @Nonnull ComputersArgumentType arg, @Nonnull JsonObject json )
         {
             json.addProperty( "requireSome", arg.requireSome );
         }
@@ -198,10 +198,10 @@ public final class ComputersArgumentType implements ArgumentType<ComputersArgume
     @FunctionalInterface
     public interface ComputersSupplier
     {
-        Collection<ServerComputer> unwrap( CommandSource source ) throws CommandSyntaxException;
+        Collection<ServerComputer> unwrap( ServerCommandSource source ) throws CommandSyntaxException;
     }
 
-    public static Set<ServerComputer> unwrap( CommandSource source, Collection<ComputersSupplier> suppliers ) throws CommandSyntaxException
+    public static Set<ServerComputer> unwrap( ServerCommandSource source, Collection<ComputersSupplier> suppliers ) throws CommandSyntaxException
     {
         Set<ServerComputer> computers = new HashSet<>();
         for( ComputersSupplier supplier : suppliers ) computers.addAll( supplier.unwrap( source ) );

src/main/java/dan200/computercraft/shared/command/arguments/RepeatArgumentType.java

@@ -16,10 +16,10 @@ import com.mojang.brigadier.exceptions.SimpleCommandExceptionType;
 import com.mojang.brigadier.suggestion.Suggestions;
 import com.mojang.brigadier.suggestion.SuggestionsBuilder;
 import net.minecraft.command.arguments.ArgumentTypes;
-import net.minecraft.command.arguments.IArgumentSerializer;
-import net.minecraft.network.PacketBuffer;
-import net.minecraft.util.text.ITextComponent;
-import net.minecraft.util.text.TextComponentString;
+import net.minecraft.command.arguments.serialize.ArgumentSerializer;
+import net.minecraft.network.chat.Component;
+import net.minecraft.network.chat.TextComponent;
+import net.minecraft.util.PacketByteBuf;
 
 import javax.annotation.Nonnull;
 import java.util.ArrayList;
@@ -126,41 +126,41 @@ public final class RepeatArgumentType<T, U> implements ArgumentType<List<T>>
         return child.getExamples();
     }
 
-    public static class Serializer implements IArgumentSerializer<RepeatArgumentType<?, ?>>
+    public static class Serializer implements ArgumentSerializer<RepeatArgumentType<?, ?>>
     {
         @Override
-        public void write( @Nonnull RepeatArgumentType<?, ?> arg, @Nonnull PacketBuffer buf )
+        public void toPacket( RepeatArgumentType<?, ?> arg, PacketByteBuf buf )
         {
             buf.writeBoolean( arg.flatten );
-            ArgumentTypes.serialize( buf, arg.child );
+            ArgumentTypes.toPacket( buf, arg.child );
             buf.writeTextComponent( getMessage( arg ) );
         }
 
         @Nonnull
         @Override
         @SuppressWarnings( { "unchecked", "rawtypes" } )
-        public RepeatArgumentType<?, ?> read( @Nonnull PacketBuffer buf )
+        public RepeatArgumentType<?, ?> fromPacket( @Nonnull PacketByteBuf buf )
         {
             boolean isList = buf.readBoolean();
-            ArgumentType<?> child = ArgumentTypes.deserialize( buf );
-            ITextComponent message = buf.readTextComponent();
+            ArgumentType<?> child = ArgumentTypes.fromPacket( buf );
+            Component message = buf.readTextComponent();
             BiConsumer<List<Object>, ?> appender = isList ? ( list, x ) -> list.addAll( (Collection) x ) : List::add;
             return new RepeatArgumentType( child, appender, isList, new SimpleCommandExceptionType( message ) );
         }
 
         @Override
-        public void write( @Nonnull RepeatArgumentType<?, ?> arg, @Nonnull JsonObject json )
+        public void toJson( @Nonnull RepeatArgumentType<?, ?> arg, @Nonnull JsonObject json )
         {
             json.addProperty( "flatten", arg.flatten );
             json.addProperty( "child", "<<cannot serialize>>" ); // TODO: Potentially serialize this using reflection.
-            json.addProperty( "error", ITextComponent.Serializer.toJson( getMessage( arg ) ) );
+            json.addProperty( "error", TextComponent.Serializer.toJsonString( getMessage( arg ) ) );
         }
 
-        private static ITextComponent getMessage( RepeatArgumentType<?, ?> arg )
+        private static TextComponent getMessage( RepeatArgumentType<?, ?> arg )
         {
             Message message = arg.some.create().getRawMessage();
-            if( message instanceof ITextComponent ) return (ITextComponent) message;
-            return new TextComponentString( message.getString() );
+            if( message instanceof TextComponent ) return (TextComponent) message;
+            return new TextComponent( message.getString() );
         }
     }
 }

src/main/java/dan200/computercraft/shared/command/builder/CommandBuilder.java

@@ -13,7 +13,7 @@ import com.mojang.brigadier.builder.RequiredArgumentBuilder;
 import com.mojang.brigadier.context.CommandContext;
 import com.mojang.brigadier.tree.CommandNode;
 import dan200.computercraft.shared.command.arguments.RepeatArgumentType;
-import net.minecraft.command.CommandSource;
+import net.minecraft.server.command.ServerCommandSource;
 
 import java.util.ArrayList;
 import java.util.Collections;
@@ -33,14 +33,14 @@ public class CommandBuilder<S> implements CommandNodeBuilder<S, Command<S>>
     private List<ArgumentBuilder<S, ?>> args = new ArrayList<>();
     private Predicate<S> requires;
 
-    public static CommandBuilder<CommandSource> args()
+    public static CommandBuilder<ServerCommandSource> args()
     {
         return new CommandBuilder<>();
     }
 
-    public static CommandBuilder<CommandSource> command( String literal )
+    public static CommandBuilder<ServerCommandSource> command( String literal )
     {
-        CommandBuilder<CommandSource> builder = new CommandBuilder<>();
+        CommandBuilder<ServerCommandSource> builder = new CommandBuilder<>();
         builder.args.add( literal( literal ) );
         return builder;
     }

src/main/java/dan200/computercraft/shared/command/builder/HelpingArgumentBuilder.java

@@ -13,11 +13,11 @@ import com.mojang.brigadier.builder.LiteralArgumentBuilder;
 import com.mojang.brigadier.context.CommandContext;
 import com.mojang.brigadier.tree.CommandNode;
 import com.mojang.brigadier.tree.LiteralCommandNode;
-import net.minecraft.command.CommandSource;
-import net.minecraft.util.text.ITextComponent;
-import net.minecraft.util.text.TextComponentString;
-import net.minecraft.util.text.TextFormatting;
-import net.minecraft.util.text.event.ClickEvent;
+import net.minecraft.ChatFormat;
+import net.minecraft.network.chat.ClickEvent;
+import net.minecraft.network.chat.Component;
+import net.minecraft.network.chat.TextComponent;
+import net.minecraft.server.command.ServerCommandSource;
 
 import javax.annotation.Nonnull;
 import java.util.ArrayList;
@@ -30,7 +30,7 @@ import static dan200.computercraft.shared.command.text.ChatHelpers.translate;
  * An alternative to {@link LiteralArgumentBuilder} which also provides a {@code /... help} command, and defaults
  * to that command when no arguments are given.
  */
-public final class HelpingArgumentBuilder extends LiteralArgumentBuilder<CommandSource>
+public final class HelpingArgumentBuilder extends LiteralArgumentBuilder<ServerCommandSource>
 {
     private final Collection<HelpingArgumentBuilder> children = new ArrayList<>();
 
@@ -45,13 +45,13 @@ public final class HelpingArgumentBuilder extends LiteralArgumentBuilder<Command
     }
 
     @Override
-    public LiteralArgumentBuilder<CommandSource> executes( final Command<CommandSource> command )
+    public LiteralArgumentBuilder<ServerCommandSource> executes( final Command<ServerCommandSource> command )
     {
         throw new IllegalStateException( "Cannot use executes on a HelpingArgumentBuilder" );
     }
 
     @Override
-    public LiteralArgumentBuilder<CommandSource> then( final ArgumentBuilder<CommandSource, ?> argument )
+    public LiteralArgumentBuilder<ServerCommandSource> then( final ArgumentBuilder<ServerCommandSource, ?> argument )
     {
         if( getRedirect() != null ) throw new IllegalStateException( "Cannot add children to a redirected node" );
 
@@ -72,7 +72,7 @@ public final class HelpingArgumentBuilder extends LiteralArgumentBuilder<Command
     }
 
     @Override
-    public LiteralArgumentBuilder<CommandSource> then( CommandNode<CommandSource> argument )
+    public LiteralArgumentBuilder<ServerCommandSource> then( CommandNode<ServerCommandSource> argument )
     {
         if( !(argument instanceof LiteralCommandNode) )
         {
@@ -82,33 +82,33 @@ public final class HelpingArgumentBuilder extends LiteralArgumentBuilder<Command
     }
 
     @Override
-    public LiteralCommandNode<CommandSource> build()
+    public LiteralCommandNode<ServerCommandSource> build()
     {
         return buildImpl( getLiteral().replace( '-', '_' ), getLiteral() );
     }
 
-    private LiteralCommandNode<CommandSource> build( @Nonnull String id, @Nonnull String command )
+    private LiteralCommandNode<ServerCommandSource> build( @Nonnull String id, @Nonnull String command )
     {
         return buildImpl( id + "." + getLiteral().replace( '-', '_' ), command + " " + getLiteral() );
     }
 
-    private LiteralCommandNode<CommandSource> buildImpl( String id, String command )
+    private LiteralCommandNode<ServerCommandSource> buildImpl( String id, String command )
     {
         HelpCommand helpCommand = new HelpCommand( id, command );
-        LiteralCommandNode<CommandSource> node = new LiteralCommandNode<>( getLiteral(), helpCommand, getRequirement(), getRedirect(), getRedirectModifier(), isFork() );
+        LiteralCommandNode<ServerCommandSource> node = new LiteralCommandNode<>( getLiteral(), helpCommand, getRequirement(), getRedirect(), getRedirectModifier(), isFork() );
         helpCommand.node = node;
 
         // Set up a /... help command
-        LiteralArgumentBuilder<CommandSource> helpNode = LiteralArgumentBuilder.<CommandSource>literal( "help" )
+        LiteralArgumentBuilder<ServerCommandSource> helpNode = LiteralArgumentBuilder.<ServerCommandSource>literal( "help" )
             .requires( x -> getArguments().stream().anyMatch( y -> y.getRequirement().test( x ) ) )
             .executes( helpCommand );
 
         // Add all normal command children to this and the help node
-        for( CommandNode<CommandSource> child : getArguments() )
+        for( CommandNode<ServerCommandSource> child : getArguments() )
         {
             node.addChild( child );
 
-            helpNode.then( LiteralArgumentBuilder.<CommandSource>literal( child.getName() )
+            helpNode.then( LiteralArgumentBuilder.<ServerCommandSource>literal( child.getName() )
                 .requires( child.getRequirement() )
                 .executes( helpForChild( child, id, command ) )
                 .build()
@@ -118,9 +118,9 @@ public final class HelpingArgumentBuilder extends LiteralArgumentBuilder<Command
         // And add alternative versions of which forward instead
         for( HelpingArgumentBuilder childBuilder : children )
         {
-            LiteralCommandNode<CommandSource> child = childBuilder.build( id, command );
+            LiteralCommandNode<ServerCommandSource> child = childBuilder.build( id, command );
             node.addChild( child );
-            helpNode.then( LiteralArgumentBuilder.<CommandSource>literal( child.getName() )
+            helpNode.then( LiteralArgumentBuilder.<ServerCommandSource>literal( child.getName() )
                 .requires( child.getRequirement() )
                 .executes( helpForChild( child, id, command ) )
                 .redirect( child.getChild( "help" ) )
@@ -133,15 +133,15 @@ public final class HelpingArgumentBuilder extends LiteralArgumentBuilder<Command
         return node;
     }
 
-    private static final TextFormatting HEADER = TextFormatting.LIGHT_PURPLE;
-    private static final TextFormatting SYNOPSIS = TextFormatting.AQUA;
-    private static final TextFormatting NAME = TextFormatting.GREEN;
+    private static final ChatFormat HEADER = ChatFormat.LIGHT_PURPLE;
+    private static final ChatFormat SYNOPSIS = ChatFormat.AQUA;
+    private static final ChatFormat NAME = ChatFormat.GREEN;
 
-    private static final class HelpCommand implements Command<CommandSource>
+    private static final class HelpCommand implements Command<ServerCommandSource>
     {
         private final String id;
         private final String command;
-        LiteralCommandNode<CommandSource> node;
+        LiteralCommandNode<ServerCommandSource> node;
 
         private HelpCommand( String id, String command )
         {
@@ -150,14 +150,14 @@ public final class HelpingArgumentBuilder extends LiteralArgumentBuilder<Command
         }
 
         @Override
-        public int run( CommandContext<CommandSource> context )
+        public int run( CommandContext<ServerCommandSource> context )
         {
             context.getSource().sendFeedback( getHelp( context, node, id, command ), false );
             return 0;
         }
     }
 
-    private static Command<CommandSource> helpForChild( CommandNode<CommandSource> node, String id, String command )
+    private static Command<ServerCommandSource> helpForChild( CommandNode<ServerCommandSource> node, String id, String command )
     {
         return context -> {
             context.getSource().sendFeedback( getHelp( context, node, id + "." + node.getName().replace( '-', '_' ), command + " " + node.getName() ), false );
@@ -165,39 +165,39 @@ public final class HelpingArgumentBuilder extends LiteralArgumentBuilder<Command
         };
     }
 
-    private static ITextComponent getHelp( CommandContext<CommandSource> context, CommandNode<CommandSource> node, String id, String command )
+    private static Component getHelp( CommandContext<ServerCommandSource> context, CommandNode<ServerCommandSource> node, String id, String command )
     {
         // An ugly hack to extract usage information from the dispatcher. We generate a temporary node, generate
         // the shorthand usage, and emit that.
-        CommandDispatcher<CommandSource> dispatcher = context.getSource().getServer().getCommandManager().getDispatcher();
-        CommandNode<CommandSource> temp = new LiteralCommandNode<>( "_", null, x -> true, null, null, false );
+        CommandDispatcher<ServerCommandSource> dispatcher = context.getSource().getMinecraftServer().getCommandManager().getDispatcher();
+        CommandNode<ServerCommandSource> temp = new LiteralCommandNode<>( "_", null, x -> true, null, null, false );
         temp.addChild( node );
         String usage = dispatcher.getSmartUsage( temp, context.getSource() ).get( node ).substring( node.getName().length() );
 
-        ITextComponent output = new TextComponentString( "" )
-            .appendSibling( coloured( "/" + command + usage, HEADER ) )
-            .appendText( " " )
-            .appendSibling( coloured( translate( "commands." + id + ".synopsis" ), SYNOPSIS ) )
-            .appendText( "\n" )
-            .appendSibling( translate( "commands." + id + ".desc" ) );
+        Component output = new TextComponent( "" )
+            .append( coloured( "/" + command + usage, HEADER ) )
+            .append( " " )
+            .append( coloured( translate( "commands." + id + ".synopsis" ), SYNOPSIS ) )
+            .append( "\n" )
+            .append( translate( "commands." + id + ".desc" ) );
 
-        for( CommandNode<CommandSource> child : node.getChildren() )
+        for( CommandNode<ServerCommandSource> child : node.getChildren() )
         {
             if( !child.getRequirement().test( context.getSource() ) || !(child instanceof LiteralCommandNode) )
             {
                 continue;
             }
 
-            output.appendText( "\n" );
+            output.append( "\n" );
 
-            ITextComponent component = coloured( child.getName(), NAME );
+            Component component = coloured( child.getName(), NAME );
             component.getStyle().setClickEvent( new ClickEvent(
                 ClickEvent.Action.SUGGEST_COMMAND,
                 "/" + command + " " + child.getName()
             ) );
-            output.appendSibling( component );
+            output.append( component );
 
-            output.appendText( " - " ).appendSibling( translate( "commands." + id + "." + child.getName() + ".synopsis" ) );
+            output.append( " - " ).append( translate( "commands." + id + "." + child.getName() + ".synopsis" ) );
         }
 
         return output;

src/main/java/dan200/computercraft/shared/command/text/ChatHelpers.java

@@ -6,83 +6,82 @@
 
 package dan200.computercraft.shared.command.text;
 
+import net.minecraft.ChatFormat;
+import net.minecraft.network.chat.*;
 import net.minecraft.util.math.BlockPos;
-import net.minecraft.util.text.*;
-import net.minecraft.util.text.event.ClickEvent;
-import net.minecraft.util.text.event.HoverEvent;
 
 /**
  * Various helpers for building chat messages
  */
 public final class ChatHelpers
 {
-    private static final TextFormatting HEADER = TextFormatting.LIGHT_PURPLE;
+    private static final ChatFormat HEADER = ChatFormat.LIGHT_PURPLE;
 
     private ChatHelpers() {}
 
-    public static ITextComponent coloured( String text, TextFormatting colour )
+    public static Component coloured( String text, ChatFormat colour )
     {
-        ITextComponent component = new TextComponentString( text == null ? "" : text );
+        TextComponent component = new TextComponent( text == null ? "" : text );
         component.getStyle().setColor( colour );
         return component;
     }
 
-    public static <T extends ITextComponent> T coloured( T component, TextFormatting colour )
+    public static <T extends Component> T coloured( T component, ChatFormat colour )
     {
         component.getStyle().setColor( colour );
         return component;
     }
 
-    public static ITextComponent text( String text )
+    public static Component text( String text )
     {
-        return new TextComponentString( text == null ? "" : text );
+        return new TextComponent( text == null ? "" : text );
     }
 
-    public static ITextComponent translate( String text )
+    public static Component translate( String text )
     {
-        return new TextComponentTranslation( text == null ? "" : text );
+        return new TranslatableComponent( text == null ? "" : text );
     }
 
-    public static ITextComponent translate( String text, Object... args )
+    public static Component translate( String text, Object... args )
     {
-        return new TextComponentTranslation( text == null ? "" : text, args );
+        return new TranslatableComponent( text == null ? "" : text, args );
     }
 
-    public static ITextComponent list( ITextComponent... children )
+    public static Component list( Component... children )
     {
-        ITextComponent component = new TextComponentString( "" );
-        for( ITextComponent child : children )
+        Component component = new TextComponent( "" );
+        for( Component child : children )
         {
-            component.appendSibling( child );
+            component.append( child );
         }
         return component;
     }
 
-    public static ITextComponent position( BlockPos pos )
+    public static Component position( BlockPos pos )
     {
         if( pos == null ) return translate( "commands.computercraft.generic.no_position" );
         return translate( "commands.computercraft.generic.position", pos.getX(), pos.getY(), pos.getZ() );
     }
 
-    public static ITextComponent bool( boolean value )
+    public static Component bool( boolean value )
     {
         return value
-            ? coloured( translate( "commands.computercraft.generic.yes" ), TextFormatting.GREEN )
-            : coloured( translate( "commands.computercraft.generic.no" ), TextFormatting.RED );
+            ? coloured( translate( "commands.computercraft.generic.yes" ), ChatFormat.GREEN )
+            : coloured( translate( "commands.computercraft.generic.no" ), ChatFormat.RED );
     }
 
-    public static ITextComponent link( ITextComponent component, String command, ITextComponent toolTip )
+    public static Component link( Component component, String command, Component toolTip )
     {
         Style style = component.getStyle();
 
-        if( style.getColor() == null ) style.setColor( TextFormatting.YELLOW );
+        if( style.getColor() == null ) style.setColor( ChatFormat.YELLOW );
         style.setClickEvent( new ClickEvent( ClickEvent.Action.RUN_COMMAND, command ) );
         style.setHoverEvent( new HoverEvent( HoverEvent.Action.SHOW_TEXT, toolTip ) );
 
         return component;
     }
 
-    public static ITextComponent header( String text )
+    public static Component header( String text )
     {
         return coloured( text, HEADER );
     }

src/main/java/dan200/computercraft/shared/command/text/ServerTableFormatter.java

@@ -6,29 +6,29 @@
 
 package dan200.computercraft.shared.command.text;
 
-import net.minecraft.command.CommandSource;
-import net.minecraft.util.text.ITextComponent;
-import net.minecraft.util.text.TextComponentString;
+import net.minecraft.network.chat.Component;
+import net.minecraft.network.chat.TextComponent;
+import net.minecraft.server.command.ServerCommandSource;
 import org.apache.commons.lang3.StringUtils;
 
 import javax.annotation.Nullable;
 
 public class ServerTableFormatter implements TableFormatter
 {
-    private final CommandSource source;
+    private final ServerCommandSource source;
 
-    public ServerTableFormatter( CommandSource source )
+    public ServerTableFormatter( ServerCommandSource source )
     {
         this.source = source;
     }
 
     @Override
     @Nullable
-    public ITextComponent getPadding( ITextComponent component, int width )
+    public Component getPadding( Component component, int width )
     {
         int extraWidth = width - getWidth( component );
         if( extraWidth <= 0 ) return null;
-        return new TextComponentString( StringUtils.repeat( ' ', extraWidth ) );
+        return new TextComponent( StringUtils.repeat( ' ', extraWidth ) );
     }
 
     @Override
@@ -38,13 +38,13 @@ public class ServerTableFormatter implements TableFormatter
     }
 
     @Override
-    public int getWidth( ITextComponent component )
+    public int getWidth( Component component )
     {
-        return component.getString().length();
+        return component.getText().length();
     }
 
     @Override
-    public void writeLine( int id, ITextComponent component )
+    public void writeLine( int id, Component component )
     {
         source.sendFeedback( component, false );
     }

src/main/java/dan200/computercraft/shared/command/text/TableBuilder.java

@@ -9,9 +9,9 @@ package dan200.computercraft.shared.command.text;
 import dan200.computercraft.shared.command.CommandUtils;
 import dan200.computercraft.shared.network.NetworkHandler;
 import dan200.computercraft.shared.network.client.ChatTableClientMessage;
-import net.minecraft.command.CommandSource;
-import net.minecraft.entity.player.EntityPlayerMP;
-import net.minecraft.util.text.ITextComponent;
+import net.minecraft.network.chat.Component;
+import net.minecraft.server.command.ServerCommandSource;
+import net.minecraft.server.network.ServerPlayerEntity;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -22,11 +22,11 @@ public class TableBuilder
 {
     private final int id;
     private int columns = -1;
-    private final ITextComponent[] headers;
-    private final ArrayList<ITextComponent[]> rows = new ArrayList<>();
+    private final Component[] headers;
+    private final ArrayList<Component[]> rows = new ArrayList<>();
     private int additional;
 
-    public TableBuilder( int id, @Nonnull ITextComponent... headers )
+    public TableBuilder( int id, @Nonnull Component... headers )
     {
         if( id < 0 ) throw new IllegalArgumentException( "ID must be positive" );
         this.id = id;
@@ -45,13 +45,13 @@ public class TableBuilder
     {
         if( id < 0 ) throw new IllegalArgumentException( "ID must be positive" );
         this.id = id;
-        this.headers = new ITextComponent[headers.length];
+        this.headers = new Component[headers.length];
         columns = headers.length;
 
         for( int i = 0; i < headers.length; i++ ) this.headers[i] = ChatHelpers.header( headers[i] );
     }
 
-    public void row( @Nonnull ITextComponent... row )
+    public void row( @Nonnull Component... row )
     {
         if( columns == -1 ) columns = row.length;
         if( row.length != columns ) throw new IllegalArgumentException( "Row is the incorrect length" );
@@ -85,13 +85,13 @@ public class TableBuilder
     }
 
     @Nullable
-    public ITextComponent[] getHeaders()
+    public Component[] getHeaders()
     {
         return headers;
     }
 
     @Nonnull
-    public List<ITextComponent[]> getRows()
+    public List<Component[]> getRows()
     {
         return rows;
     }
@@ -120,12 +120,12 @@ public class TableBuilder
         }
     }
 
-    public void display( CommandSource source )
+    public void display( ServerCommandSource source )
     {
         if( CommandUtils.isPlayer( source ) )
         {
             trim( 18 );
-            NetworkHandler.sendToPlayer( (EntityPlayerMP) source.getEntity(), new ChatTableClientMessage( this ) );
+            NetworkHandler.sendToPlayer( (ServerPlayerEntity) source.getEntity(), new ChatTableClientMessage( this ) );
         }
         else
         {

src/main/java/dan200/computercraft/shared/command/text/TableFormatter.java

@@ -6,9 +6,9 @@
 
 package dan200.computercraft.shared.command.text;
 
-import net.minecraft.util.text.ITextComponent;
-import net.minecraft.util.text.TextComponentString;
-import net.minecraft.util.text.TextFormatting;
+import net.minecraft.ChatFormat;
+import net.minecraft.network.chat.Component;
+import net.minecraft.network.chat.TextComponent;
 import org.apache.commons.lang3.StringUtils;
 
 import javax.annotation.Nullable;
@@ -18,8 +18,8 @@ import static dan200.computercraft.shared.command.text.ChatHelpers.translate;
 
 public interface TableFormatter
 {
-    ITextComponent SEPARATOR = coloured( "| ", TextFormatting.GRAY );
-    ITextComponent HEADER = coloured( "=", TextFormatting.GRAY );
+    Component SEPARATOR = coloured( "| ", ChatFormat.GRAY );
+    Component HEADER = coloured( "=", ChatFormat.GRAY );
 
     /**
      * Get additional padding for the component
@@ -29,7 +29,7 @@ public interface TableFormatter
      * @return The padding for this component, or {@code null} if none is needed.
      */
     @Nullable
-    ITextComponent getPadding( ITextComponent component, int width );
+    Component getPadding( Component component, int width );
 
     /**
      * Get the minimum padding between each column
@@ -38,9 +38,9 @@ public interface TableFormatter
      */
     int getColumnPadding();
 
-    int getWidth( ITextComponent component );
+    int getWidth( Component component );
 
-    void writeLine( int id, ITextComponent component );
+    void writeLine( int id, Component component );
 
     default int display( TableBuilder table )
     {
@@ -50,13 +50,13 @@ public interface TableFormatter
         int columns = table.getColumns();
         int[] maxWidths = new int[columns];
 
-        ITextComponent[] headers = table.getHeaders();
+        Component[] headers = table.getHeaders();
         if( headers != null )
         {
             for( int i = 0; i < columns; i++ ) maxWidths[i] = getWidth( headers[i] );
         }
 
-        for( ITextComponent[] row : table.getRows() )
+        for( Component[] row : table.getRows() )
         {
             for( int i = 0; i < row.length; i++ )
             {
@@ -77,15 +77,15 @@ public interface TableFormatter
 
         if( headers != null )
         {
-            TextComponentString line = new TextComponentString( "" );
+            TextComponent line = new TextComponent( "" );
             for( int i = 0; i < columns - 1; i++ )
             {
-                line.appendSibling( headers[i] );
-                ITextComponent padding = getPadding( headers[i], maxWidths[i] );
-                if( padding != null ) line.appendSibling( padding );
-                line.appendSibling( SEPARATOR );
+                line.append( headers[i] );
+                Component padding = getPadding( headers[i], maxWidths[i] );
+                if( padding != null ) line.append( padding );
+                line.append( SEPARATOR );
             }
-            line.appendSibling( headers[columns - 1] );
+            line.append( headers[columns - 1] );
 
             writeLine( rowId++, line );
 
@@ -93,26 +93,26 @@ public interface TableFormatter
             // it a tad prettier.
             int rowCharWidth = getWidth( HEADER );
             int rowWidth = totalWidth / rowCharWidth + (totalWidth % rowCharWidth == 0 ? 0 : 1);
-            writeLine( rowId++, coloured( StringUtils.repeat( HEADER.getString(), rowWidth ), TextFormatting.GRAY ) );
+            writeLine( rowId++, coloured( StringUtils.repeat( HEADER.getText(), rowWidth ), ChatFormat.GRAY ) );
         }
 
-        for( ITextComponent[] row : table.getRows() )
+        for( Component[] row : table.getRows() )
         {
-            TextComponentString line = new TextComponentString( "" );
+            TextComponent line = new TextComponent( "" );
             for( int i = 0; i < columns - 1; i++ )
             {
-                line.appendSibling( row[i] );
-                ITextComponent padding = getPadding( row[i], maxWidths[i] );
-                if( padding != null ) line.appendSibling( padding );
-                line.appendSibling( SEPARATOR );
+                line.append( row[i] );
+                Component padding = getPadding( row[i], maxWidths[i] );
+                if( padding != null ) line.append( padding );
+                line.append( SEPARATOR );
             }
-            line.appendSibling( row[columns - 1] );
+            line.append( row[columns - 1] );
             writeLine( rowId++, line );
         }
 
         if( table.getAdditional() > 0 )
         {
-            writeLine( rowId++, coloured( translate( "commands.computercraft.generic.additional_rows", table.getAdditional() ), TextFormatting.AQUA ) );
+            writeLine( rowId++, coloured( translate( "commands.computercraft.generic.additional_rows", table.getAdditional() ), ChatFormat.AQUA ) );
         }
 
         return rowId - table.getId();

src/main/java/dan200/computercraft/shared/common/BlockGeneric.java

@@ -6,86 +6,75 @@
 
 package dan200.computercraft.shared.common;
 
+import dan200.computercraft.shared.util.NamedBlockEntityType;
 import net.minecraft.block.Block;
-import net.minecraft.block.state.IBlockState;
-import net.minecraft.entity.player.EntityPlayer;
-import net.minecraft.tileentity.TileEntity;
-import net.minecraft.tileentity.TileEntityType;
-import net.minecraft.util.EnumFacing;
-import net.minecraft.util.EnumHand;
+import net.minecraft.block.BlockEntityProvider;
+import net.minecraft.block.BlockState;
+import net.minecraft.block.entity.BlockEntity;
+import net.minecraft.block.entity.BlockEntityType;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.util.Hand;
+import net.minecraft.util.hit.BlockHitResult;
 import net.minecraft.util.math.BlockPos;
-import net.minecraft.world.IBlockReader;
-import net.minecraft.world.IWorldReader;
+import net.minecraft.world.BlockView;
 import net.minecraft.world.World;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 import java.util.Random;
 
-public abstract class BlockGeneric extends Block
+public abstract class BlockGeneric extends Block implements BlockEntityProvider
 {
-    private final TileEntityType<? extends TileGeneric> type;
+    private final BlockEntityType<? extends TileGeneric> type;
 
-    public BlockGeneric( Properties settings, TileEntityType<? extends TileGeneric> type )
+    public BlockGeneric( Settings settings, NamedBlockEntityType<? extends TileGeneric> type )
     {
         super( settings );
         this.type = type;
+        type.setBlock( this );
     }
 
     @Override
     @Deprecated
-    public final void onReplaced( @Nonnull IBlockState block, @Nonnull World world, @Nonnull BlockPos pos, IBlockState replace, boolean bool )
+    public final void onBlockRemoved( @Nonnull BlockState block, @Nonnull World world, @Nonnull BlockPos pos, BlockState replace, boolean bool )
     {
         if( block.getBlock() == replace.getBlock() ) return;
 
-        TileEntity tile = world.getTileEntity( pos );
-        super.onReplaced( block, world, pos, replace, bool );
-        world.removeTileEntity( pos );
+        BlockEntity tile = world.getBlockEntity( pos );
+        super.onBlockRemoved( block, world, pos, replace, bool );
+        world.removeBlockEntity( pos );
         if( tile instanceof TileGeneric ) ((TileGeneric) tile).destroy();
     }
 
     @Override
     @Deprecated
-    public final boolean onBlockActivated( IBlockState state, World world, BlockPos pos, EntityPlayer player, EnumHand hand, EnumFacing side, float hitX, float hitY, float hitZ )
+    public final boolean activate( BlockState state, World world, BlockPos pos, PlayerEntity player, Hand hand, BlockHitResult hit )
     {
-        TileEntity tile = world.getTileEntity( pos );
-        return tile instanceof TileGeneric && ((TileGeneric) tile).onActivate( player, hand, side, hitX, hitY, hitZ );
+        BlockEntity tile = world.getBlockEntity( pos );
+        return tile instanceof TileGeneric && ((TileGeneric) tile).onActivate( player, hand, hit );
     }
 
     @Override
     @Deprecated
-    @SuppressWarnings( "deprecation" )
-    public final void neighborChanged( IBlockState state, World world, BlockPos pos, Block neighbourBlock, BlockPos neighbourPos )
+    public final void neighborUpdate( BlockState state, World world, BlockPos pos, Block neighbourBlock, BlockPos neighbourPos, boolean flag )
     {
-        TileEntity tile = world.getTileEntity( pos );
+        super.neighborUpdate( state, world, pos, neighbourBlock, neighbourPos, flag );
+        BlockEntity tile = world.getBlockEntity( pos );
         if( tile instanceof TileGeneric ) ((TileGeneric) tile).onNeighbourChange( neighbourPos );
     }
 
-    @Override
-    public final void onNeighborChange( IBlockState state, IWorldReader world, BlockPos pos, BlockPos neighbour )
-    {
-        TileEntity tile = world.getTileEntity( pos );
-        if( tile instanceof TileGeneric ) ((TileGeneric) tile).onNeighbourTileEntityChange( neighbour );
-    }
-
     @Override
     @Deprecated
-    public void tick( IBlockState state, World world, BlockPos pos, Random rand )
+    public void onScheduledTick( BlockState state, World world, BlockPos pos, Random rand )
     {
-        TileEntity te = world.getTileEntity( pos );
+        BlockEntity te = world.getBlockEntity( pos );
         if( te instanceof TileGeneric ) ((TileGeneric) te).blockTick();
     }
 
-    @Override
-    public boolean hasTileEntity( IBlockState state )
-    {
-        return true;
-    }
-
     @Nullable
     @Override
-    public TileEntity createTileEntity( @Nonnull IBlockState state, @Nonnull IBlockReader world )
+    public BlockEntity createBlockEntity( BlockView blockView )
     {
-        return type.create();
+        return type.instantiate();
     }
 }

src/main/java/dan200/computercraft/shared/common/ClientTerminal.java

@@ -7,7 +7,7 @@
 package dan200.computercraft.shared.common;
 
 import dan200.computercraft.core.terminal.Terminal;
-import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.nbt.CompoundTag;
 
 public class ClientTerminal implements ITerminal
 {
@@ -47,12 +47,12 @@ public class ClientTerminal implements ITerminal
         return m_colour;
     }
 
-    public void readDescription( NBTTagCompound nbt )
+    public void readDescription( CompoundTag nbt )
     {
         m_colour = nbt.getBoolean( "colour" );
-        if( nbt.contains( "terminal" ) )
+        if( nbt.containsKey( "terminal" ) )
         {
-            NBTTagCompound terminal = nbt.getCompound( "terminal" );
+            CompoundTag terminal = nbt.getCompound( "terminal" );
             resizeTerminal( terminal.getInt( "term_width" ), terminal.getInt( "term_height" ) );
             m_terminal.readFromNBT( terminal );
         }

src/main/java/dan200/computercraft/shared/common/ColourableRecipe.java

@@ -6,36 +6,35 @@
 
 package dan200.computercraft.shared.common;
 
-import dan200.computercraft.ComputerCraft;
-import dan200.computercraft.shared.util.AbstractRecipe;
 import dan200.computercraft.shared.util.Colour;
 import dan200.computercraft.shared.util.ColourTracker;
 import dan200.computercraft.shared.util.ColourUtils;
-import net.minecraft.inventory.IInventory;
-import net.minecraft.item.EnumDyeColor;
+import net.minecraft.inventory.CraftingInventory;
 import net.minecraft.item.ItemStack;
-import net.minecraft.item.crafting.IRecipeSerializer;
-import net.minecraft.item.crafting.RecipeSerializers;
-import net.minecraft.util.ResourceLocation;
+import net.minecraft.recipe.RecipeSerializer;
+import net.minecraft.recipe.SpecialCraftingRecipe;
+import net.minecraft.recipe.SpecialRecipeSerializer;
+import net.minecraft.util.DyeColor;
+import net.minecraft.util.Identifier;
 import net.minecraft.world.World;
 
 import javax.annotation.Nonnull;
 
-public class ColourableRecipe extends AbstractRecipe
+public class ColourableRecipe extends SpecialCraftingRecipe
 {
-    public ColourableRecipe( ResourceLocation id )
+    public ColourableRecipe( Identifier id )
     {
         super( id );
     }
 
     @Override
-    public boolean matches( @Nonnull IInventory inv, @Nonnull World world )
+    public boolean matches( @Nonnull CraftingInventory inv, @Nonnull World world )
     {
         boolean hasColourable = false;
         boolean hasDye = false;
-        for( int i = 0; i < inv.getSizeInventory(); i++ )
+        for( int i = 0; i < inv.getInvSize(); i++ )
         {
-            ItemStack stack = inv.getStackInSlot( i );
+            ItemStack stack = inv.getInvStack( i );
             if( stack.isEmpty() ) continue;
 
             if( stack.getItem() instanceof IColouredItem )
@@ -58,15 +57,15 @@ public class ColourableRecipe extends AbstractRecipe
 
     @Nonnull
     @Override
-    public ItemStack getCraftingResult( @Nonnull IInventory inv )
+    public ItemStack craft( @Nonnull CraftingInventory inv )
     {
         ItemStack colourable = ItemStack.EMPTY;
 
         ColourTracker tracker = new ColourTracker();
 
-        for( int i = 0; i < inv.getSizeInventory(); i++ )
+        for( int i = 0; i < inv.getInvSize(); i++ )
         {
-            ItemStack stack = inv.getStackInSlot( i );
+            ItemStack stack = inv.getInvStack( i );
 
             if( stack.isEmpty() ) continue;
 
@@ -76,7 +75,7 @@ public class ColourableRecipe extends AbstractRecipe
             }
             else
             {
-                EnumDyeColor dye = ColourUtils.getStackColour( stack );
+                DyeColor dye = ColourUtils.getStackColour( stack );
                 if( dye == null ) continue;
 
                 Colour colour = Colour.fromInt( 15 - dye.getId() );
@@ -89,19 +88,17 @@ public class ColourableRecipe extends AbstractRecipe
     }
 
     @Override
-    public boolean canFit( int x, int y )
+    public boolean fits( int x, int y )
     {
         return x >= 2 && y >= 2;
     }
 
     @Override
     @Nonnull
-    public IRecipeSerializer<?> getSerializer()
+    public RecipeSerializer<?> getSerializer()
     {
         return SERIALIZER;
     }
 
-    public static final IRecipeSerializer<?> SERIALIZER = new RecipeSerializers.SimpleSerializer<>(
-        ComputerCraft.MOD_ID + ":colour", ColourableRecipe::new
-    );
+    public static final RecipeSerializer<?> SERIALIZER = new SpecialRecipeSerializer<>( ColourableRecipe::new );
 }

src/main/java/dan200/computercraft/shared/common/ContainerHeldItem.java

@@ -7,22 +7,23 @@
 package dan200.computercraft.shared.common;
 
 import dan200.computercraft.shared.util.InventoryUtil;
-import net.minecraft.entity.player.EntityPlayer;
-import net.minecraft.inventory.Container;
+import net.minecraft.container.Container;
+import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.ItemStack;
-import net.minecraft.util.EnumHand;
+import net.minecraft.util.Hand;
 
 import javax.annotation.Nonnull;
 
 public class ContainerHeldItem extends Container
 {
     private final ItemStack m_stack;
-    private final EnumHand m_hand;
+    private final Hand m_hand;
 
-    public ContainerHeldItem( EntityPlayer player, EnumHand hand )
+    public ContainerHeldItem( int id, PlayerEntity player, Hand hand )
     {
+        super( null, id );
         m_hand = hand;
-        m_stack = InventoryUtil.copyItem( player.getHeldItem( hand ) );
+        m_stack = InventoryUtil.copyItem( player.getStackInHand( hand ) );
     }
 
     @Nonnull
@@ -32,11 +33,11 @@ public class ContainerHeldItem extends Container
     }
 
     @Override
-    public boolean canInteractWith( @Nonnull EntityPlayer player )
+    public boolean canUse( @Nonnull PlayerEntity player )
     {
         if( !player.isAlive() ) return false;
 
-        ItemStack stack = player.getHeldItem( m_hand );
+        ItemStack stack = player.getStackInHand( m_hand );
         return stack == m_stack || !stack.isEmpty() && !m_stack.isEmpty() && stack.getItem() == m_stack.getItem();
     }
 }

src/main/java/dan200/computercraft/shared/common/DefaultBundledRedstoneProvider.java

@@ -8,8 +8,8 @@ package dan200.computercraft.shared.common;
 
 import dan200.computercraft.api.redstone.IBundledRedstoneProvider;
 import net.minecraft.block.Block;
-import net.minecraft.util.EnumFacing;
 import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.Direction;
 import net.minecraft.world.World;
 
 import javax.annotation.Nonnull;
@@ -17,12 +17,12 @@ import javax.annotation.Nonnull;
 public class DefaultBundledRedstoneProvider implements IBundledRedstoneProvider
 {
     @Override
-    public int getBundledRedstoneOutput( @Nonnull World world, @Nonnull BlockPos pos, @Nonnull EnumFacing side )
+    public int getBundledRedstoneOutput( @Nonnull World world, @Nonnull BlockPos pos, @Nonnull Direction side )
     {
         return getDefaultBundledRedstoneOutput( world, pos, side );
     }
 
-    public static int getDefaultBundledRedstoneOutput( World world, BlockPos pos, EnumFacing side )
+    public static int getDefaultBundledRedstoneOutput( World world, BlockPos pos, Direction side )
     {
         Block block = world.getBlockState( pos ).getBlock();
         if( block instanceof IBundledRedstoneBlock )

src/main/java/dan200/computercraft/shared/common/IBundledRedstoneBlock.java

@@ -6,13 +6,13 @@
 
 package dan200.computercraft.shared.common;
 
-import net.minecraft.util.EnumFacing;
 import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.Direction;
 import net.minecraft.world.World;
 
 public interface IBundledRedstoneBlock
 {
-    boolean getBundledRedstoneConnectivity( World world, BlockPos pos, EnumFacing side );
+    boolean getBundledRedstoneConnectivity( World world, BlockPos pos, Direction side );
 
-    int getBundledRedstoneOutput( World world, BlockPos pos, EnumFacing side );
+    int getBundledRedstoneOutput( World world, BlockPos pos, Direction side );
 }

src/main/java/dan200/computercraft/shared/common/IColouredItem.java

@@ -7,7 +7,7 @@
 package dan200.computercraft.shared.common;
 
 import net.minecraft.item.ItemStack;
-import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.nbt.CompoundTag;
 
 public interface IColouredItem
 {
@@ -27,15 +27,15 @@ public interface IColouredItem
 
     static int getColourBasic( ItemStack stack )
     {
-        NBTTagCompound tag = stack.getTag();
-        return tag != null && tag.contains( NBT_COLOUR ) ? tag.getInt( NBT_COLOUR ) : -1;
+        CompoundTag tag = stack.getTag();
+        return tag != null && tag.containsKey( NBT_COLOUR ) ? tag.getInt( NBT_COLOUR ) : -1;
     }
 
     static void setColourBasic( ItemStack stack, int colour )
     {
         if( colour == -1 )
         {
-            NBTTagCompound tag = stack.getTag();
+            CompoundTag tag = stack.getTag();
             if( tag != null ) tag.remove( NBT_COLOUR );
         }
         else

src/main/java/dan200/computercraft/shared/common/ServerTerminal.java

@@ -7,7 +7,7 @@
 package dan200.computercraft.shared.common;
 
 import dan200.computercraft.core.terminal.Terminal;
-import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.nbt.CompoundTag;
 
 import java.util.concurrent.atomic.AtomicBoolean;
 
@@ -86,12 +86,12 @@ public class ServerTerminal implements ITerminal
 
     // Networking stuff
 
-    public void writeDescription( NBTTagCompound nbt )
+    public void writeDescription( CompoundTag nbt )
     {
         nbt.putBoolean( "colour", m_colour );
         if( m_terminal != null )
         {
-            NBTTagCompound terminal = new NBTTagCompound();
+            CompoundTag terminal = new CompoundTag();
             terminal.putInt( "term_width", m_terminal.getWidth() );
             terminal.putInt( "term_height", m_terminal.getHeight() );
             m_terminal.writeToNBT( terminal );

src/main/java/dan200/computercraft/shared/common/TileGeneric.java

@@ -6,22 +6,21 @@
 
 package dan200.computercraft.shared.common;
 
-import net.minecraft.block.state.IBlockState;
-import net.minecraft.entity.player.EntityPlayer;
-import net.minecraft.nbt.NBTTagCompound;
-import net.minecraft.network.NetworkManager;
-import net.minecraft.network.play.server.SPacketUpdateTileEntity;
-import net.minecraft.tileentity.TileEntity;
-import net.minecraft.tileentity.TileEntityType;
-import net.minecraft.util.EnumFacing;
-import net.minecraft.util.EnumHand;
+import net.fabricmc.fabric.api.block.entity.BlockEntityClientSerializable;
+import net.minecraft.block.BlockState;
+import net.minecraft.block.entity.BlockEntity;
+import net.minecraft.block.entity.BlockEntityType;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.util.Hand;
+import net.minecraft.util.hit.BlockHitResult;
 import net.minecraft.util.math.BlockPos;
 
 import javax.annotation.Nonnull;
 
-public abstract class TileGeneric extends TileEntity
+public abstract class TileGeneric extends BlockEntity implements BlockEntityClientSerializable
 {
-    public TileGeneric( TileEntityType<? extends TileGeneric> type )
+    public TileGeneric( BlockEntityType<? extends TileGeneric> type )
     {
         super( type );
     }
@@ -34,12 +33,12 @@ public abstract class TileGeneric extends TileEntity
     {
         markDirty();
         BlockPos pos = getPos();
-        IBlockState state = getBlockState();
-        getWorld().markBlockRangeForRenderUpdate( pos, pos );
-        getWorld().notifyBlockUpdate( pos, state, state, 3 );
+        BlockState state = getCachedState();
+        getWorld().scheduleBlockRender( pos );
+        getWorld().updateListeners( pos, state, state, 3 );
     }
 
-    public boolean onActivate( EntityPlayer player, EnumHand hand, EnumFacing side, float hitX, float hitY, float hitZ )
+    public boolean onActivate( PlayerEntity player, Hand hand, BlockHitResult hit )
     {
         return false;
     }
@@ -56,58 +55,40 @@ public abstract class TileGeneric extends TileEntity
     {
     }
 
-    protected double getInteractRange( EntityPlayer player )
+    protected double getInteractRange( PlayerEntity player )
     {
         return 8.0;
     }
 
-    public boolean isUsable( EntityPlayer player, boolean ignoreRange )
+    public boolean isUsable( PlayerEntity player, boolean ignoreRange )
     {
-        if( player == null || !player.isAlive() || getWorld().getTileEntity( getPos() ) != this ) return false;
+        if( player == null || !player.isAlive() || getWorld().getBlockEntity( getPos() ) != this ) return false;
         if( ignoreRange ) return true;
 
         double range = getInteractRange( player );
         BlockPos pos = getPos();
         return player.getEntityWorld() == getWorld() &&
-            player.getDistanceSq( pos.getX() + 0.5, pos.getY() + 0.5, pos.getZ() + 0.5 ) <= range * range;
+            player.squaredDistanceTo( pos.getX() + 0.5, pos.getY() + 0.5, pos.getZ() + 0.5 ) <= range * range;
     }
 
-    protected void writeDescription( @Nonnull NBTTagCompound nbt )
+    protected void writeDescription( @Nonnull CompoundTag nbt )
     {
     }
 
-    protected void readDescription( @Nonnull NBTTagCompound nbt )
+    protected void readDescription( @Nonnull CompoundTag nbt )
     {
     }
 
-    @Nonnull
-    @Override
-    public final SPacketUpdateTileEntity getUpdatePacket()
-    {
-        NBTTagCompound nbt = new NBTTagCompound();
-        writeDescription( nbt );
-        return new SPacketUpdateTileEntity( pos, 0, nbt );
-    }
-
     @Override
-    public final void onDataPacket( NetworkManager net, SPacketUpdateTileEntity packet )
+    public final CompoundTag toClientTag( CompoundTag tag )
     {
-        if( packet.getTileEntityType() == 0 ) readDescription( packet.getNbtCompound() );
-    }
-
-    @Nonnull
-    @Override
-    public NBTTagCompound getUpdateTag()
-    {
-        NBTTagCompound tag = super.getUpdateTag();
         writeDescription( tag );
         return tag;
     }
 
     @Override
-    public void handleUpdateTag( @Nonnull NBTTagCompound tag )
+    public final void fromClientTag( CompoundTag tag )
     {
-        super.handleUpdateTag( tag );
         readDescription( tag );
     }
 }

src/main/java/dan200/computercraft/shared/computer/apis/CommandAPI.java

@@ -16,16 +16,16 @@ import dan200.computercraft.api.lua.LuaException;
 import dan200.computercraft.shared.computer.blocks.TileCommandComputer;
 import dan200.computercraft.shared.util.NBTUtil;
 import net.minecraft.block.Block;
-import net.minecraft.block.state.IBlockState;
-import net.minecraft.command.CommandSource;
-import net.minecraft.command.Commands;
-import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.block.BlockState;
+import net.minecraft.block.entity.BlockEntity;
+import net.minecraft.nbt.CompoundTag;
 import net.minecraft.server.MinecraftServer;
-import net.minecraft.state.IProperty;
-import net.minecraft.tileentity.TileEntity;
+import net.minecraft.server.command.CommandManager;
+import net.minecraft.server.command.ServerCommandSource;
+import net.minecraft.state.property.Property;
 import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.registry.Registry;
 import net.minecraft.world.World;
-import net.minecraftforge.registries.ForgeRegistries;
 
 import javax.annotation.Nonnull;
 import java.util.Collections;
@@ -76,17 +76,17 @@ public class CommandAPI implements ILuaAPI
     private Object[] doCommand( String command )
     {
         MinecraftServer server = m_computer.getWorld().getServer();
-        if( server == null || !server.isCommandBlockEnabled() )
+        if( server == null || !server.areCommandBlocksEnabled() )
         {
             return new Object[] { false, createOutput( "Command blocks disabled by server" ) };
         }
 
-        Commands commandManager = server.getCommandManager();
+        CommandManager commandManager = server.getCommandManager();
         TileCommandComputer.CommandReceiver receiver = m_computer.getReceiver();
         try
         {
             receiver.clearOutput();
-            int result = commandManager.handleCommand( m_computer.getSource(), command );
+            int result = commandManager.execute( m_computer.getSource(), command );
             return new Object[] { result > 0, receiver.copyOutput() };
         }
         catch( Throwable t )
@@ -99,31 +99,31 @@ public class CommandAPI implements ILuaAPI
     private static Object getBlockInfo( World world, BlockPos pos )
     {
         // Get the details of the block
-        IBlockState state = world.getBlockState( pos );
+        BlockState state = world.getBlockState( pos );
         Block block = state.getBlock();
 
         Map<Object, Object> table = new HashMap<>();
-        table.put( "name", ForgeRegistries.BLOCKS.getKey( block ).toString() );
+        table.put( "name", Registry.BLOCK.getId( block ).toString() );
 
         Map<Object, Object> stateTable = new HashMap<>();
-        for( ImmutableMap.Entry<IProperty<?>, Comparable<?>> entry : state.getValues().entrySet() )
+        for( ImmutableMap.Entry<Property<?>, Comparable<?>> entry : state.getEntries().entrySet() )
         {
-            IProperty<?> property = entry.getKey();
+            Property<?> property = entry.getKey();
             stateTable.put( property.getName(), getPropertyValue( property, entry.getValue() ) );
         }
         table.put( "state", stateTable );
 
-        TileEntity tile = world.getTileEntity( pos );
-        if( tile != null ) table.put( "nbt", NBTUtil.toLua( tile.write( new NBTTagCompound() ) ) );
+        BlockEntity tile = world.getBlockEntity( pos );
+        if( tile != null ) table.put( "nbt", NBTUtil.toLua( tile.toTag( new CompoundTag() ) ) );
 
         return table;
     }
 
     @SuppressWarnings( { "unchecked", "rawtypes" } )
-    private static Object getPropertyValue( IProperty property, Comparable value )
+    private static Object getPropertyValue( Property property, Comparable value )
     {
         if( value instanceof String || value instanceof Number || value instanceof Boolean ) return value;
-        return property.getName( value );
+        return property.getValueAsString( value );
     }
 
     @Override
@@ -149,7 +149,7 @@ public class CommandAPI implements ILuaAPI
                     MinecraftServer server = m_computer.getWorld().getServer();
 
                     if( server == null ) return new Object[] { Collections.emptyMap() };
-                    CommandNode<CommandSource> node = server.getCommandManager().getDispatcher().getRoot();
+                    CommandNode<ServerCommandSource> node = server.getCommandManager().getDispatcher().getRoot();
                     for( int j = 0; j < arguments.length; j++ )
                     {
                         String name = getString( arguments, j );

src/main/java/dan200/computercraft/shared/computer/blocks/BlockComputer.java

@@ -9,16 +9,16 @@ package dan200.computercraft.shared.computer.blocks;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
 import dan200.computercraft.shared.computer.core.ComputerState;
 import dan200.computercraft.shared.computer.items.ComputerItemFactory;
+import dan200.computercraft.shared.util.NamedBlockEntityType;
 import net.minecraft.block.Block;
-import net.minecraft.block.state.IBlockState;
-import net.minecraft.item.BlockItemUseContext;
+import net.minecraft.block.BlockState;
+import net.minecraft.item.ItemPlacementContext;
 import net.minecraft.item.ItemStack;
-import net.minecraft.state.DirectionProperty;
-import net.minecraft.state.EnumProperty;
-import net.minecraft.state.StateContainer;
-import net.minecraft.state.properties.BlockStateProperties;
-import net.minecraft.tileentity.TileEntityType;
-import net.minecraft.util.EnumFacing;
+import net.minecraft.state.StateFactory;
+import net.minecraft.state.property.DirectionProperty;
+import net.minecraft.state.property.EnumProperty;
+import net.minecraft.state.property.Properties;
+import net.minecraft.util.math.Direction;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -26,28 +26,28 @@ import javax.annotation.Nullable;
 public class BlockComputer extends BlockComputerBase<TileComputer>
 {
     public static final EnumProperty<ComputerState> STATE = EnumProperty.create( "state", ComputerState.class );
-    public static final DirectionProperty FACING = BlockStateProperties.HORIZONTAL_FACING;
+    public static final DirectionProperty FACING = Properties.FACING_HORIZONTAL;
 
-    public BlockComputer( Properties settings, ComputerFamily family, TileEntityType<? extends TileComputer> type )
+    public BlockComputer( Settings settings, ComputerFamily family, NamedBlockEntityType<? extends TileComputer> type )
     {
         super( settings, family, type );
         setDefaultState( getDefaultState()
-            .with( FACING, EnumFacing.NORTH )
+            .with( FACING, Direction.NORTH )
             .with( STATE, ComputerState.OFF )
         );
     }
 
     @Override
-    protected void fillStateContainer( StateContainer.Builder<Block, IBlockState> builder )
+    protected void appendProperties( StateFactory.Builder<Block, BlockState> builder )
     {
         builder.add( FACING, STATE );
     }
 
     @Nullable
     @Override
-    public IBlockState getStateForPlacement( BlockItemUseContext placement )
+    public BlockState getPlacementState( ItemPlacementContext placement )
     {
-        return getDefaultState().with( FACING, placement.getPlacementHorizontalFacing().getOpposite() );
+        return getDefaultState().with( FACING, placement.getPlayerHorizontalFacing().getOpposite() );
     }
 
     @Nonnull

src/main/java/dan200/computercraft/shared/computer/blocks/BlockComputerBase.java

@@ -6,33 +6,36 @@
 
 package dan200.computercraft.shared.computer.blocks;
 
+import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.core.computer.ComputerSide;
 import dan200.computercraft.shared.common.BlockGeneric;
 import dan200.computercraft.shared.common.IBundledRedstoneBlock;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
 import dan200.computercraft.shared.computer.core.ServerComputer;
 import dan200.computercraft.shared.computer.items.IComputerItem;
-import net.minecraft.block.state.IBlockState;
-import net.minecraft.entity.EntityLivingBase;
-import net.minecraft.entity.player.EntityPlayer;
-import net.minecraft.fluid.IFluidState;
+import dan200.computercraft.shared.util.NamedBlockEntityType;
+import net.minecraft.block.BlockState;
+import net.minecraft.block.entity.BlockEntity;
+import net.minecraft.entity.LivingEntity;
 import net.minecraft.item.ItemStack;
-import net.minecraft.tileentity.TileEntity;
-import net.minecraft.tileentity.TileEntityType;
-import net.minecraft.util.EnumFacing;
-import net.minecraft.util.NonNullList;
+import net.minecraft.util.Identifier;
 import net.minecraft.util.math.BlockPos;
-import net.minecraft.util.math.RayTraceResult;
-import net.minecraft.world.IBlockReader;
+import net.minecraft.util.math.Direction;
+import net.minecraft.world.BlockView;
 import net.minecraft.world.World;
+import net.minecraft.world.loot.context.LootContext;
+import net.minecraft.world.loot.context.LootContextParameters;
 
 import javax.annotation.Nonnull;
+import java.util.List;
 
 public abstract class BlockComputerBase<T extends TileComputerBase> extends BlockGeneric implements IBundledRedstoneBlock
 {
+    private static final Identifier COMPUTER_DROP = new Identifier( ComputerCraft.MOD_ID, "computer" );
+
     private final ComputerFamily family;
 
-    protected BlockComputerBase( Properties settings, ComputerFamily family, TileEntityType<? extends T> type )
+    protected BlockComputerBase( Settings settings, ComputerFamily family, NamedBlockEntityType<? extends T> type )
     {
         super( settings, type );
         this.family = family;
@@ -40,26 +43,26 @@ public abstract class BlockComputerBase<T extends TileComputerBase> extends Bloc
 
     @Override
     @Deprecated
-    public void onBlockAdded( IBlockState state, World world, BlockPos pos, IBlockState oldState )
+    public void onBlockAdded( BlockState state, World world, BlockPos pos, BlockState oldState, boolean flag )
     {
-        super.onBlockAdded( state, world, pos, oldState );
+        super.onBlockAdded( state, world, pos, oldState, flag );
 
-        TileEntity tile = world.getTileEntity( pos );
+        BlockEntity tile = world.getBlockEntity( pos );
         if( tile instanceof TileComputerBase ) ((TileComputerBase) tile).updateInput();
     }
 
     @Override
     @Deprecated
-    public boolean canProvidePower( IBlockState state )
+    public boolean emitsRedstonePower( BlockState state )
     {
         return true;
     }
 
     @Override
     @Deprecated
-    public int getStrongPower( IBlockState state, IBlockReader world, BlockPos pos, EnumFacing incomingSide )
+    public int getStrongRedstonePower( BlockState state, BlockView world, BlockPos pos, Direction incomingSide )
     {
-        TileEntity entity = world.getTileEntity( pos );
+        BlockEntity entity = world.getBlockEntity( pos );
         if( !(entity instanceof TileComputerBase) ) return 0;
 
         TileComputerBase computerEntity = (TileComputerBase) entity;
@@ -80,21 +83,21 @@ public abstract class BlockComputerBase<T extends TileComputerBase> extends Bloc
 
     @Override
     @Deprecated
-    public int getWeakPower( IBlockState state, IBlockReader world, BlockPos pos, EnumFacing incomingSide )
+    public int getWeakRedstonePower( BlockState state, BlockView world, BlockPos pos, Direction incomingSide )
     {
-        return getStrongPower( state, world, pos, incomingSide );
+        return getStrongRedstonePower( state, world, pos, incomingSide );
     }
 
     @Override
-    public boolean getBundledRedstoneConnectivity( World world, BlockPos pos, EnumFacing side )
+    public boolean getBundledRedstoneConnectivity( World world, BlockPos pos, Direction side )
     {
         return true;
     }
 
     @Override
-    public int getBundledRedstoneOutput( World world, BlockPos pos, EnumFacing side )
+    public int getBundledRedstoneOutput( World world, BlockPos pos, Direction side )
     {
-        TileEntity entity = world.getTileEntity( pos );
+        BlockEntity entity = world.getBlockEntity( pos );
         if( !(entity instanceof TileComputerBase) ) return 0;
 
         TileComputerBase computerEntity = (TileComputerBase) entity;
@@ -107,63 +110,37 @@ public abstract class BlockComputerBase<T extends TileComputerBase> extends Bloc
 
     @Nonnull
     @Override
-    public ItemStack getPickBlock( IBlockState state, RayTraceResult target, IBlockReader world, BlockPos pos, EntityPlayer player )
+    public ItemStack getPickStack( BlockView world, BlockPos pos, BlockState state )
     {
-        TileEntity tile = world.getTileEntity( pos );
+        BlockEntity tile = world.getBlockEntity( pos );
         if( tile instanceof TileComputerBase )
         {
             ItemStack result = getItem( (TileComputerBase) tile );
             if( !result.isEmpty() ) return result;
         }
 
-        return super.getPickBlock( state, target, world, pos, player );
+        return super.getPickStack( world, pos, state );
     }
 
     @Override
     @Deprecated
-    public final void dropBlockAsItemWithChance( @Nonnull IBlockState state, World world, @Nonnull BlockPos pos, float change, int fortune )
+    public List<ItemStack> getDroppedStacks( BlockState state, LootContext.Builder builder )
     {
+        // TODO: Find a way of doing creative block drops
+        builder.putDrop( COMPUTER_DROP, ( context, consumer ) -> {
+            BlockEntity tile = context.get( LootContextParameters.BLOCK_ENTITY );
+            if( tile instanceof TileComputerBase ) consumer.accept( getItem( (TileComputerBase) tile ) );
+        } );
+        return super.getDroppedStacks( state, builder );
     }
 
     @Override
-    public final void getDrops( IBlockState state, NonNullList<ItemStack> drops, World world, BlockPos pos, int fortune )
+    public void onPlaced( World world, BlockPos pos, BlockState state, LivingEntity placer, ItemStack stack )
     {
-        TileEntity tile = world.getTileEntity( pos );
-        if( tile instanceof TileComputerBase )
-        {
-            ItemStack stack = getItem( (TileComputerBase) tile );
-            if( !stack.isEmpty() ) drops.add( stack );
-        }
-    }
+        super.onPlaced( world, pos, state, placer, stack );
 
-    @Override
-    public boolean removedByPlayer( IBlockState state, World world, BlockPos pos, EntityPlayer player, boolean willHarvest, IFluidState fluid )
-    {
-        if( !world.isRemote )
-        {
-            // We drop the item here instead of doing it in the harvest method, as we
-            // need to drop it for creative players too.
-            TileEntity tile = world.getTileEntity( pos );
-            if( tile instanceof TileComputerBase )
-            {
-                TileComputerBase computer = (TileComputerBase) tile;
-                if( !player.abilities.isCreativeMode || computer.getLabel() != null )
-                {
-                    spawnAsEntity( world, pos, getItem( computer ) );
-                }
-            }
-        }
-
-        return super.removedByPlayer( state, world, pos, player, willHarvest, fluid );
-    }
-
-    @Override
-    public void onBlockPlacedBy( World world, BlockPos pos, IBlockState state, EntityLivingBase placer, ItemStack stack )
-    {
-        super.onBlockPlacedBy( world, pos, state, placer, stack );
-
-        TileEntity tile = world.getTileEntity( pos );
-        if( !world.isRemote && tile instanceof IComputerTile && stack.getItem() instanceof IComputerItem )
+        BlockEntity tile = world.getBlockEntity( pos );
+        if( !world.isClient && tile instanceof IComputerTile && stack.getItem() instanceof IComputerItem )
         {
             IComputerTile computer = (IComputerTile) tile;
             IComputerItem item = (IComputerItem) stack.getItem();

src/main/java/dan200/computercraft/shared/computer/blocks/TileCommandComputer.java

@@ -11,31 +11,30 @@ import dan200.computercraft.shared.computer.apis.CommandAPI;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
 import dan200.computercraft.shared.computer.core.ServerComputer;
 import dan200.computercraft.shared.util.NamedBlockEntityType;
-import net.minecraft.command.CommandSource;
-import net.minecraft.command.ICommandSource;
-import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.block.entity.BlockEntityType;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.network.chat.Component;
+import net.minecraft.network.chat.TextComponent;
+import net.minecraft.network.chat.TranslatableComponent;
 import net.minecraft.server.MinecraftServer;
-import net.minecraft.tileentity.TileEntityType;
-import net.minecraft.util.ResourceLocation;
+import net.minecraft.server.command.CommandOutput;
+import net.minecraft.server.command.ServerCommandSource;
+import net.minecraft.server.world.ServerWorld;
+import net.minecraft.util.Identifier;
 import net.minecraft.util.math.Vec2f;
 import net.minecraft.util.math.Vec3d;
-import net.minecraft.util.text.ITextComponent;
-import net.minecraft.util.text.TextComponentString;
-import net.minecraft.util.text.TextComponentTranslation;
-import net.minecraft.world.WorldServer;
 
-import javax.annotation.Nonnull;
 import java.util.HashMap;
 import java.util.Map;
 
 public class TileCommandComputer extends TileComputer
 {
     public static final NamedBlockEntityType<TileCommandComputer> FACTORY = NamedBlockEntityType.create(
-        new ResourceLocation( ComputerCraft.MOD_ID, "command_computer" ),
+        new Identifier( ComputerCraft.MOD_ID, "command_computer" ),
         f -> new TileCommandComputer( ComputerFamily.Command, f )
     );
 
-    public class CommandReceiver implements ICommandSource
+    public class CommandReceiver implements CommandOutput
     {
         private final Map<Integer, String> output = new HashMap<>();
 
@@ -55,25 +54,25 @@ public class TileCommandComputer extends TileComputer
         }
 
         @Override
-        public void sendMessage( @Nonnull ITextComponent textComponent )
+        public void sendMessage( Component textComponent )
         {
-            output.put( output.size() + 1, textComponent.getString() );
+            output.put( output.size() + 1, textComponent.getText() );
         }
 
         @Override
-        public boolean shouldReceiveFeedback()
+        public boolean sendCommandFeedback()
         {
             return getWorld().getGameRules().getBoolean( "sendCommandFeedback" );
         }
 
         @Override
-        public boolean shouldReceiveErrors()
+        public boolean shouldTrackOutput()
         {
             return true;
         }
 
         @Override
-        public boolean allowLogging()
+        public boolean shouldBroadcastConsoleToOps()
         {
             return getWorld().getGameRules().getBoolean( "commandBlockOutput" );
         }
@@ -81,7 +80,7 @@ public class TileCommandComputer extends TileComputer
 
     private final CommandReceiver receiver;
 
-    public TileCommandComputer( ComputerFamily family, TileEntityType<? extends TileCommandComputer> type )
+    public TileCommandComputer( ComputerFamily family, BlockEntityType<? extends TileCommandComputer> type )
     {
         super( family, type );
         receiver = new CommandReceiver();
@@ -92,7 +91,7 @@ public class TileCommandComputer extends TileComputer
         return receiver;
     }
 
-    public CommandSource getSource()
+    public ServerCommandSource getSource()
     {
         ServerComputer computer = getServerComputer();
         String name = "@";
@@ -102,10 +101,10 @@ public class TileCommandComputer extends TileComputer
             if( label != null ) name = label;
         }
 
-        return new CommandSource( receiver,
+        return new ServerCommandSource( receiver,
             new Vec3d( pos.getX() + 0.5, pos.getY() + 0.5, pos.getZ() + 0.5 ), Vec2f.ZERO,
-            (WorldServer) getWorld(), 2,
-            name, new TextComponentString( name ),
+            (ServerWorld) getWorld(), 2,
+            name, new TextComponent( name ),
             getWorld().getServer(), null
         );
     }
@@ -119,17 +118,17 @@ public class TileCommandComputer extends TileComputer
     }
 
     @Override
-    public boolean isUsable( EntityPlayer player, boolean ignoreRange )
+    public boolean isUsable( PlayerEntity player, boolean ignoreRange )
     {
         MinecraftServer server = player.getServer();
-        if( server == null || !server.isCommandBlockEnabled() )
+        if( server == null || !server.areCommandBlocksEnabled() )
         {
-            player.sendStatusMessage( new TextComponentTranslation( "advMode.notEnabled" ), true );
+            player.addChatMessage( new TranslatableComponent( "advMode.notEnabled" ), true );
             return false;
         }
-        else if( !player.canUseCommandBlock() )
+        else if( !player.isCreativeLevelTwoOp() )
         {
-            player.sendStatusMessage( new TextComponentTranslation( "advMode.notAllowed" ), true );
+            player.addChatMessage( new TranslatableComponent( "advMode.notAllowed" ), true );
             return false;
         }
         else

src/main/java/dan200/computercraft/shared/computer/blocks/TileComputer.java

@@ -13,27 +13,27 @@ import dan200.computercraft.shared.computer.core.ComputerState;
 import dan200.computercraft.shared.computer.core.ServerComputer;
 import dan200.computercraft.shared.network.Containers;
 import dan200.computercraft.shared.util.NamedBlockEntityType;
-import net.minecraft.block.state.IBlockState;
-import net.minecraft.entity.player.EntityPlayer;
-import net.minecraft.tileentity.TileEntityType;
-import net.minecraft.util.EnumFacing;
-import net.minecraft.util.ResourceLocation;
+import net.minecraft.block.BlockState;
+import net.minecraft.block.entity.BlockEntityType;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.util.Identifier;
+import net.minecraft.util.math.Direction;
 
 public class TileComputer extends TileComputerBase
 {
     public static final NamedBlockEntityType<TileComputer> FACTORY_NORMAL = NamedBlockEntityType.create(
-        new ResourceLocation( ComputerCraft.MOD_ID, "computer_normal" ),
+        new Identifier( ComputerCraft.MOD_ID, "computer_normal" ),
         f -> new TileComputer( ComputerFamily.Normal, f )
     );
 
     public static final NamedBlockEntityType<TileComputer> FACTORY_ADVANCED = NamedBlockEntityType.create(
-        new ResourceLocation( ComputerCraft.MOD_ID, "computer_advanced" ),
+        new Identifier( ComputerCraft.MOD_ID, "computer_advanced" ),
         f -> new TileComputer( ComputerFamily.Advanced, f )
     );
 
     private ComputerProxy m_proxy;
 
-    public TileComputer( ComputerFamily family, TileEntityType<? extends TileComputer> type )
+    public TileComputer( ComputerFamily family, BlockEntityType<? extends TileComputer> type )
     {
         super( type, family );
     }
@@ -69,26 +69,26 @@ public class TileComputer extends TileComputerBase
     }
 
     @Override
-    public void openGUI( EntityPlayer player )
+    public void openGUI( PlayerEntity player )
     {
         Containers.openComputerGUI( player, this );
     }
 
-    public boolean isUsableByPlayer( EntityPlayer player )
+    public boolean isUsableByPlayer( PlayerEntity player )
     {
         return isUsable( player, false );
     }
 
     @Override
-    public EnumFacing getDirection()
+    public Direction getDirection()
     {
-        return getBlockState().get( BlockComputer.FACING );
+        return getCachedState().get( BlockComputer.FACING );
     }
 
     @Override
     protected void updateBlockState( ComputerState newState )
     {
-        IBlockState existing = getBlockState();
+        BlockState existing = getCachedState();
         if( existing.get( BlockComputer.STATE ) != newState )
         {
             getWorld().setBlockState( getPos(), existing.with( BlockComputer.STATE, newState ), 3 );

src/main/java/dan200/computercraft/shared/computer/blocks/TileComputerBase.java

@@ -20,28 +20,29 @@ import dan200.computercraft.shared.computer.core.ServerComputer;
 import dan200.computercraft.shared.util.DirectionUtil;
 import dan200.computercraft.shared.util.RedstoneUtil;
 import joptsimple.internal.Strings;
-import net.minecraft.block.BlockRedstoneWire;
-import net.minecraft.block.state.IBlockState;
-import net.minecraft.entity.player.EntityPlayer;
-import net.minecraft.init.Blocks;
-import net.minecraft.init.Items;
+import net.minecraft.block.BlockState;
+import net.minecraft.block.Blocks;
+import net.minecraft.block.RedstoneWireBlock;
+import net.minecraft.block.entity.BlockEntityType;
+import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.ItemStack;
-import net.minecraft.nbt.NBTTagCompound;
-import net.minecraft.tileentity.TileEntityType;
-import net.minecraft.util.EnumFacing;
-import net.minecraft.util.EnumHand;
-import net.minecraft.util.INameable;
-import net.minecraft.util.ITickable;
+import net.minecraft.item.Items;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.network.chat.Component;
+import net.minecraft.network.chat.TextComponent;
+import net.minecraft.util.Hand;
+import net.minecraft.util.Nameable;
+import net.minecraft.util.Tickable;
+import net.minecraft.util.hit.BlockHitResult;
 import net.minecraft.util.math.BlockPos;
-import net.minecraft.util.text.ITextComponent;
-import net.minecraft.util.text.TextComponentString;
+import net.minecraft.util.math.Direction;
 import net.minecraft.world.World;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 import java.util.Objects;
 
-public abstract class TileComputerBase extends TileGeneric implements IComputerTile, ITickable, IPeripheralTile, INameable
+public abstract class TileComputerBase extends TileGeneric implements IComputerTile, Tickable, IPeripheralTile, Nameable
 {
     private static final String NBT_ID = "ComputerId";
     private static final String NBT_LABEL = "Label";
@@ -57,7 +58,7 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
 
     private final ComputerFamily family;
 
-    public TileComputerBase( TileEntityType<? extends TileGeneric> type, ComputerFamily family )
+    public TileComputerBase( BlockEntityType<? extends TileGeneric> type, ComputerFamily family )
     {
         super( type );
         this.family = family;
@@ -67,7 +68,7 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
     {
         if( m_instanceID >= 0 )
         {
-            if( !getWorld().isRemote ) ComputerCraft.serverComputerRegistry.remove( m_instanceID );
+            if( !getWorld().isClient ) ComputerCraft.serverComputerRegistry.remove( m_instanceID );
             m_instanceID = -1;
         }
     }
@@ -76,50 +77,52 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
     public void destroy()
     {
         unload();
-        for( EnumFacing dir : DirectionUtil.FACINGS )
+        for( Direction dir : DirectionUtil.FACINGS )
         {
             RedstoneUtil.propagateRedstoneOutput( getWorld(), getPos(), dir );
         }
     }
 
+    /*
     @Override
     public void onChunkUnloaded()
     {
         unload();
     }
+    */
 
     @Override
-    public void remove()
+    public void invalidate()
     {
         unload();
-        super.remove();
+        super.invalidate();
     }
 
-    public abstract void openGUI( EntityPlayer player );
+    public abstract void openGUI( PlayerEntity player );
 
-    protected boolean canNameWithTag( EntityPlayer player )
+    protected boolean canNameWithTag( PlayerEntity player )
     {
         return false;
     }
 
     @Override
-    public boolean onActivate( EntityPlayer player, EnumHand hand, EnumFacing side, float hitX, float hitY, float hitZ )
+    public boolean onActivate( PlayerEntity player, Hand hand, BlockHitResult hit )
     {
-        ItemStack currentItem = player.getHeldItem( hand );
+        ItemStack currentItem = player.getStackInHand( hand );
         if( !currentItem.isEmpty() && currentItem.getItem() == Items.NAME_TAG && canNameWithTag( player ) && currentItem.hasDisplayName() )
         {
             // Label to rename computer
-            if( !getWorld().isRemote )
+            if( !getWorld().isClient )
             {
-                setLabel( currentItem.getDisplayName().getString() );
-                currentItem.shrink( 1 );
+                setLabel( currentItem.getDisplayName().getText() );
+                currentItem.subtractAmount( 1 );
             }
             return true;
         }
         else if( !player.isSneaking() )
         {
             // Regular right click to activate computer
-            if( !getWorld().isRemote && isUsable( player, false ) )
+            if( !getWorld().isClient && isUsable( player, false ) )
             {
                 createServerComputer().turnOn();
                 openGUI( player );
@@ -144,7 +147,7 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
     @Override
     public void tick()
     {
-        if( !getWorld().isRemote )
+        if( !getWorld().isClient )
         {
             ServerComputer computer = createServerComputer();
             if( computer == null ) return;
@@ -182,24 +185,24 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
 
     @Nonnull
     @Override
-    public NBTTagCompound write( NBTTagCompound nbt )
+    public CompoundTag toTag( CompoundTag nbt )
     {
         // Save ID, label and power state
         if( m_computerID >= 0 ) nbt.putInt( NBT_ID, m_computerID );
         if( m_label != null ) nbt.putString( NBT_LABEL, m_label );
         nbt.putBoolean( NBT_ON, m_on );
 
-        return super.write( nbt );
+        return super.toTag( nbt );
     }
 
     @Override
-    public void read( NBTTagCompound nbt )
+    public void fromTag( CompoundTag nbt )
     {
-        super.read( nbt );
+        super.fromTag( nbt );
 
         // Load ID, label and power state
-        m_computerID = nbt.contains( NBT_ID ) ? nbt.getInt( NBT_ID ) : -1;
-        m_label = nbt.contains( NBT_LABEL ) ? nbt.getString( NBT_LABEL ) : null;
+        m_computerID = nbt.containsKey( NBT_ID ) ? nbt.getInt( NBT_ID ) : -1;
+        m_label = nbt.containsKey( NBT_LABEL ) ? nbt.getString( NBT_LABEL ) : null;
         m_on = m_startOn = nbt.getBoolean( NBT_ON );
     }
 
@@ -208,9 +211,9 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
         return false;
     }
 
-    protected abstract EnumFacing getDirection();
+    protected abstract Direction getDirection();
 
-    protected ComputerSide remapToLocalSide( EnumFacing globalSide )
+    protected ComputerSide remapToLocalSide( Direction globalSide )
     {
         return remapLocalSide( DirectionUtil.toLocal( getDirection(), globalSide ) );
     }
@@ -220,9 +223,9 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
         return localSide;
     }
 
-    private void updateSideInput( ServerComputer computer, EnumFacing dir, BlockPos offset )
+    private void updateSideInput( ServerComputer computer, Direction dir, BlockPos offset )
     {
-        EnumFacing offsetSide = dir.getOpposite();
+        Direction offsetSide = dir.getOpposite();
         ComputerSide localDir = remapToLocalSide( dir );
 
         computer.setRedstoneInput( localDir, getRedstoneInput( world, offset, dir ) );
@@ -240,29 +243,29 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
      * @param pos   The position of the neighbour
      * @param side  The side we are reading from
      * @return The effective redstone power
-     * @see net.minecraft.block.BlockRedstoneDiode#calculateInputStrength(World, BlockPos, IBlockState)
+     * @see net.minecraft.block.RedstoneBlock#method_9991(World, BlockPos, BlockState)
      */
-    protected static int getRedstoneInput( World world, BlockPos pos, EnumFacing side )
+    protected static int getRedstoneInput( World world, BlockPos pos, Direction side )
     {
-        int power = world.getRedstonePower( pos, side );
+        int power = world.getEmittedRedstonePower( pos, side );
         if( power >= 15 ) return power;
 
-        IBlockState neighbour = world.getBlockState( pos );
+        BlockState neighbour = world.getBlockState( pos );
         return neighbour.getBlock() == Blocks.REDSTONE_WIRE
-            ? Math.max( power, neighbour.get( BlockRedstoneWire.POWER ) )
+            ? Math.max( power, neighbour.get( RedstoneWireBlock.POWER ) )
             : power;
     }
 
     public void updateInput()
     {
-        if( getWorld() == null || getWorld().isRemote ) return;
+        if( getWorld() == null || getWorld().isClient ) return;
 
         // Update all sides
         ServerComputer computer = getServerComputer();
         if( computer == null ) return;
 
         BlockPos pos = computer.getPosition();
-        for( EnumFacing dir : DirectionUtil.FACINGS )
+        for( Direction dir : DirectionUtil.FACINGS )
         {
             updateSideInput( computer, dir, pos.offset( dir ) );
         }
@@ -270,13 +273,13 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
 
     private void updateInput( BlockPos neighbour )
     {
-        if( getWorld() == null || getWorld().isRemote ) return;
+        if( getWorld() == null || getWorld().isClient ) return;
 
         ServerComputer computer = getServerComputer();
         if( computer == null ) return;
 
         BlockPos pos = computer.getPosition();
-        for( EnumFacing dir : DirectionUtil.FACINGS )
+        for( Direction dir : DirectionUtil.FACINGS )
         {
             BlockPos offset = pos.offset( dir );
             if( offset.equals( neighbour ) )
@@ -294,7 +297,7 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
     {
         // Update redstone
         updateBlock();
-        for( EnumFacing dir : DirectionUtil.FACINGS )
+        for( Direction dir : DirectionUtil.FACINGS )
         {
             RedstoneUtil.propagateRedstoneOutput( getWorld(), getPos(), dir );
         }
@@ -319,7 +322,7 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
     @Override
     public final void setComputerID( int id )
     {
-        if( getWorld().isRemote || m_computerID == id ) return;
+        if( getWorld().isClient || m_computerID == id ) return;
 
         m_computerID = id;
         ServerComputer computer = getServerComputer();
@@ -330,7 +333,7 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
     @Override
     public final void setLabel( String label )
     {
-        if( getWorld().isRemote || Objects.equals( m_label, label ) ) return;
+        if( getWorld().isClient || Objects.equals( m_label, label ) ) return;
 
         m_label = label;
         ServerComputer computer = getServerComputer();
@@ -346,7 +349,7 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
 
     public ServerComputer createServerComputer()
     {
-        if( getWorld().isRemote ) return null;
+        if( getWorld().isClient ) return null;
 
         boolean changed = false;
         if( m_instanceID < 0 )
@@ -371,12 +374,12 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
 
     public ServerComputer getServerComputer()
     {
-        return getWorld().isRemote ? null : ComputerCraft.serverComputerRegistry.get( m_instanceID );
+        return getWorld().isClient ? null : ComputerCraft.serverComputerRegistry.get( m_instanceID );
     }
 
     public ClientComputer createClientComputer()
     {
-        if( !getWorld().isRemote || m_instanceID < 0 ) return null;
+        if( !getWorld().isClient || m_instanceID < 0 ) return null;
 
         ClientComputer computer = ComputerCraft.clientComputerRegistry.get( m_instanceID );
         if( computer == null )
@@ -388,13 +391,13 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
 
     public ClientComputer getClientComputer()
     {
-        return getWorld().isRemote ? ComputerCraft.clientComputerRegistry.get( m_instanceID ) : null;
+        return getWorld().isClient ? ComputerCraft.clientComputerRegistry.get( m_instanceID ) : null;
     }
 
     // Networking stuff
 
     @Override
-    protected void writeDescription( @Nonnull NBTTagCompound nbt )
+    protected void writeDescription( @Nonnull CompoundTag nbt )
     {
         super.writeDescription( nbt );
 
@@ -404,12 +407,12 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
     }
 
     @Override
-    protected void readDescription( @Nonnull NBTTagCompound nbt )
+    protected void readDescription( @Nonnull CompoundTag nbt )
     {
         super.readDescription( nbt );
-        m_instanceID = nbt.contains( NBT_INSTANCE ) ? nbt.getInt( NBT_INSTANCE ) : -1;
-        m_label = nbt.contains( NBT_LABEL ) ? nbt.getString( NBT_LABEL ) : null;
-        m_computerID = nbt.contains( NBT_ID ) ? nbt.getInt( NBT_ID ) : -1;
+        m_instanceID = nbt.containsKey( NBT_INSTANCE ) ? nbt.getInt( NBT_INSTANCE ) : -1;
+        m_label = nbt.containsKey( NBT_LABEL ) ? nbt.getString( NBT_LABEL ) : null;
+        m_computerID = nbt.containsKey( NBT_ID ) ? nbt.getInt( NBT_ID ) : -1;
     }
 
     protected void transferStateFrom( TileComputerBase copy )
@@ -429,16 +432,16 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
 
     @Nullable
     @Override
-    public IPeripheral getPeripheral( @Nonnull EnumFacing side )
+    public IPeripheral getPeripheral( @Nonnull Direction side )
     {
         return new ComputerPeripheral( "computer", createProxy() );
     }
 
     @Nonnull
     @Override
-    public ITextComponent getName()
+    public Component getName()
     {
-        return hasCustomName() ? new TextComponentString( m_label ) : getBlockState().getBlock().getNameTextComponent();
+        return hasCustomName() ? new TextComponent( m_label ) : getCachedState().getBlock().getTextComponent();
     }
 
     @Override
@@ -449,8 +452,8 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
 
     @Nullable
     @Override
-    public ITextComponent getCustomName()
+    public Component getCustomName()
     {
-        return hasCustomName() ? new TextComponentString( m_label ) : null;
+        return hasCustomName() ? new TextComponent( m_label ) : null;
     }
 }

src/main/java/dan200/computercraft/shared/computer/core/ClientComputer.java

@@ -10,7 +10,7 @@ import com.google.common.base.Objects;
 import dan200.computercraft.shared.common.ClientTerminal;
 import dan200.computercraft.shared.network.NetworkHandler;
 import dan200.computercraft.shared.network.server.*;
-import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.nbt.CompoundTag;
 
 public class ClientComputer extends ClientTerminal implements IComputer
 {
@@ -19,7 +19,7 @@ public class ClientComputer extends ClientTerminal implements IComputer
     private boolean m_on = false;
     private boolean m_blinking = false;
     private boolean m_changed = true;
-    private NBTTagCompound m_userData = null;
+    private CompoundTag m_userData = null;
 
     private boolean m_changedLastFrame = false;
 
@@ -40,7 +40,7 @@ public class ClientComputer extends ClientTerminal implements IComputer
         return m_changedLastFrame;
     }
 
-    public NBTTagCompound getUserData()
+    public CompoundTag getUserData()
     {
         return m_userData;
     }
@@ -135,11 +135,11 @@ public class ClientComputer extends ClientTerminal implements IComputer
         NetworkHandler.sendToServer( new MouseEventServerMessage( m_instanceID, MouseEventServerMessage.TYPE_SCROLL, direction, x, y ) );
     }
 
-    public void setState( ComputerState state, NBTTagCompound userData )
+    public void setState( ComputerState state, CompoundTag userData )
     {
         boolean oldOn = m_on;
         boolean oldBlinking = m_blinking;
-        NBTTagCompound oldUserData = m_userData;
+        CompoundTag oldUserData = m_userData;
 
         m_on = state != ComputerState.OFF;
         m_blinking = state == ComputerState.BLINKING;

src/main/java/dan200/computercraft/shared/computer/core/ComputerState.java

@@ -6,11 +6,11 @@
 
 package dan200.computercraft.shared.computer.core;
 
-import net.minecraft.util.IStringSerializable;
+import net.minecraft.util.StringIdentifiable;
 
 import javax.annotation.Nonnull;
 
-public enum ComputerState implements IStringSerializable
+public enum ComputerState implements StringIdentifiable
 {
     OFF( "off" ),
     ON( "on" ),
@@ -25,7 +25,7 @@ public enum ComputerState implements IStringSerializable
 
     @Nonnull
     @Override
-    public String getName()
+    public String asString()
     {
         return name;
     }

src/main/java/dan200/computercraft/shared/computer/core/ServerComputer.java

@@ -22,14 +22,13 @@ import dan200.computercraft.shared.network.NetworkMessage;
 import dan200.computercraft.shared.network.client.ComputerDataClientMessage;
 import dan200.computercraft.shared.network.client.ComputerDeletedClientMessage;
 import dan200.computercraft.shared.network.client.ComputerTerminalClientMessage;
-import net.minecraft.entity.player.EntityPlayer;
-import net.minecraft.inventory.Container;
-import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.SharedConstants;
+import net.minecraft.container.Container;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.nbt.CompoundTag;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.World;
-import net.minecraftforge.fml.server.ServerLifecycleHooks;
-import net.minecraftforge.versions.mcp.MCPVersion;
 
 import javax.annotation.Nullable;
 import java.io.InputStream;
@@ -43,7 +42,7 @@ public class ServerComputer extends ServerTerminal implements IComputer, IComput
 
     private final ComputerFamily m_family;
     private final Computer m_computer;
-    private NBTTagCompound m_userData;
+    private CompoundTag m_userData;
     private boolean m_changed;
 
     private boolean m_changedLastFrame;
@@ -134,11 +133,11 @@ public class ServerComputer extends ServerTerminal implements IComputer, IComput
         m_computer.unload();
     }
 
-    public NBTTagCompound getUserData()
+    public CompoundTag getUserData()
     {
         if( m_userData == null )
         {
-            m_userData = new NBTTagCompound();
+            m_userData = new CompoundTag();
         }
         return m_userData;
     }
@@ -155,26 +154,28 @@ public class ServerComputer extends ServerTerminal implements IComputer, IComput
 
     protected NetworkMessage createTerminalPacket()
     {
-        NBTTagCompound tagCompound = new NBTTagCompound();
+        CompoundTag tagCompound = new CompoundTag();
         writeDescription( tagCompound );
         return new ComputerTerminalClientMessage( getInstanceID(), tagCompound );
     }
 
     public void broadcastState( boolean force )
     {
+        MinecraftServer server = m_world == null ? null : m_world.getServer();
+        if( server == null ) return;
+
         if( hasOutputChanged() || force )
         {
             // Send computer state to all clients
-            NetworkHandler.sendToAllPlayers( createComputerPacket() );
+            NetworkHandler.sendToAllPlayers( server, createComputerPacket() );
         }
 
         if( hasTerminalChanged() || force )
         {
             // Send terminal state to clients who are currently interacting with the computer.
-            MinecraftServer server = ServerLifecycleHooks.getCurrentServer();
 
             NetworkMessage packet = null;
-            for( EntityPlayer player : server.getPlayerList().getPlayers() )
+            for( PlayerEntity player : server.getPlayerManager().getPlayerList() )
             {
                 if( isInteracting( player ) )
                 {
@@ -185,13 +186,13 @@ public class ServerComputer extends ServerTerminal implements IComputer, IComput
         }
     }
 
-    public void sendComputerState( EntityPlayer player )
+    public void sendComputerState( PlayerEntity player )
     {
         // Send state to client
         NetworkHandler.sendToPlayer( player, createComputerPacket() );
     }
 
-    public void sendTerminalState( EntityPlayer player )
+    public void sendTerminalState( PlayerEntity player )
     {
         // Send terminal state to client
         NetworkHandler.sendToPlayer( player, createTerminalPacket() );
@@ -200,7 +201,9 @@ public class ServerComputer extends ServerTerminal implements IComputer, IComput
     public void broadcastDelete()
     {
         // Send deletion to client
-        NetworkHandler.sendToAllPlayers( new ComputerDeletedClientMessage( getInstanceID() ) );
+        MinecraftServer server = m_world == null ? null : m_world.getServer();
+        if( server == null ) return;
+        NetworkHandler.sendToAllPlayers( server, new ComputerDeletedClientMessage( getInstanceID() ) );
     }
 
     public void setID( int id )
@@ -311,13 +314,13 @@ public class ServerComputer extends ServerTerminal implements IComputer, IComput
     @Override
     public double getTimeOfDay()
     {
-        return (m_world.getGameTime() + 6000) % 24000 / 1000.0;
+        return (m_world.getTime() + 6000) % 24000 / 1000.0;
     }
 
     @Override
     public int getDay()
     {
-        return (int) ((m_world.getGameTime() + 6000) / 24000) + 1;
+        return (int) ((m_world.getTime() + 6000) / 24000) + 1;
     }
 
     @Override
@@ -347,7 +350,7 @@ public class ServerComputer extends ServerTerminal implements IComputer, IComput
     @Override
     public String getHostString()
     {
-        return "ComputerCraft ${version} (Minecraft " + MCPVersion.getMCVersion() + ")";
+        return "ComputerCraft ${version} (Minecraft " + SharedConstants.getGameVersion() + ")";
     }
 
     @Override
@@ -357,18 +360,18 @@ public class ServerComputer extends ServerTerminal implements IComputer, IComput
     }
 
     @Nullable
-    public IContainerComputer getContainer( EntityPlayer player )
+    public IContainerComputer getContainer( PlayerEntity player )
     {
         if( player == null ) return null;
 
-        Container container = player.openContainer;
+        Container container = player.container;
         if( !(container instanceof IContainerComputer) ) return null;
 
         IContainerComputer computerContainer = (IContainerComputer) container;
         return computerContainer.getComputer() != this ? null : computerContainer;
     }
 
-    protected boolean isInteracting( EntityPlayer player )
+    protected boolean isInteracting( PlayerEntity player )
     {
         return getContainer( player ) != null;
     }

src/main/java/dan200/computercraft/shared/computer/inventory/ContainerComputer.java

@@ -10,8 +10,8 @@ import dan200.computercraft.shared.computer.blocks.TileComputer;
 import dan200.computercraft.shared.computer.core.IComputer;
 import dan200.computercraft.shared.computer.core.IContainerComputer;
 import dan200.computercraft.shared.computer.core.InputState;
-import net.minecraft.entity.player.EntityPlayer;
-import net.minecraft.inventory.Container;
+import net.minecraft.container.Container;
+import net.minecraft.entity.player.PlayerEntity;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -21,13 +21,14 @@ public class ContainerComputer extends Container implements IContainerComputer
     private final TileComputer computer;
     private final InputState input = new InputState( this );
 
-    public ContainerComputer( TileComputer computer )
+    public ContainerComputer( int id, TileComputer computer )
     {
+        super( null, id );
         this.computer = computer;
     }
 
     @Override
-    public boolean canInteractWith( @Nonnull EntityPlayer player )
+    public boolean canUse( @Nonnull PlayerEntity player )
     {
         return computer.isUsableByPlayer( player );
     }
@@ -47,9 +48,9 @@ public class ContainerComputer extends Container implements IContainerComputer
     }
 
     @Override
-    public void onContainerClosed( EntityPlayer player )
+    public void close( PlayerEntity player )
     {
-        super.onContainerClosed( player );
+        super.close( player );
         input.close();
     }
 }

src/main/java/dan200/computercraft/shared/computer/inventory/ContainerViewComputer.java

@@ -8,10 +8,10 @@ package dan200.computercraft.shared.computer.inventory;
 
 import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.shared.computer.core.*;
-import net.minecraft.entity.player.EntityPlayer;
-import net.minecraft.inventory.Container;
+import net.minecraft.container.Container;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.network.chat.TranslatableComponent;
 import net.minecraft.server.MinecraftServer;
-import net.minecraft.util.text.TextComponentTranslation;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -21,8 +21,9 @@ public class ContainerViewComputer extends Container implements IContainerComput
     private final IComputer computer;
     private final InputState input = new InputState( this );
 
-    public ContainerViewComputer( IComputer computer )
+    public ContainerViewComputer( int id, IComputer computer )
     {
+        super( null, id );
         this.computer = computer;
     }
 
@@ -34,7 +35,7 @@ public class ContainerViewComputer extends Container implements IContainerComput
     }
 
     @Override
-    public boolean canInteractWith( @Nonnull EntityPlayer player )
+    public boolean canUse( @Nonnull PlayerEntity player )
     {
         if( computer instanceof ServerComputer )
         {
@@ -50,14 +51,14 @@ public class ContainerViewComputer extends Container implements IContainerComput
             if( serverComputer.getFamily() == ComputerFamily.Command )
             {
                 MinecraftServer server = player.getServer();
-                if( server == null || !server.isCommandBlockEnabled() )
+                if( server == null || !server.areCommandBlocksEnabled() )
                 {
-                    player.sendStatusMessage( new TextComponentTranslation( "advMode.notEnabled" ), false );
+                    player.addChatMessage( new TranslatableComponent( "advMode.notEnabled" ), false );
                     return false;
                 }
-                else if( !player.canUseCommandBlock() )
+                else if( !player.isCreativeLevelTwoOp() )
                 {
-                    player.sendStatusMessage( new TextComponentTranslation( "advMode.notAllowed" ), false );
+                    player.addChatMessage( new TranslatableComponent( "advMode.notAllowed" ), false );
                     return false;
                 }
             }
@@ -74,9 +75,9 @@ public class ContainerViewComputer extends Container implements IContainerComput
     }
 
     @Override
-    public void onContainerClosed( EntityPlayer player )
+    public void close( PlayerEntity player )
     {
-        super.onContainerClosed( player );
+        super.close( player );
         input.close();
     }
 }

src/main/java/dan200/computercraft/shared/computer/items/IComputerItem.java

@@ -8,7 +8,7 @@ package dan200.computercraft.shared.computer.items;
 
 import dan200.computercraft.shared.computer.core.ComputerFamily;
 import net.minecraft.item.ItemStack;
-import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.nbt.CompoundTag;
 
 import javax.annotation.Nonnull;
 
@@ -18,8 +18,8 @@ public interface IComputerItem
 
     default int getComputerID( @Nonnull ItemStack stack )
     {
-        NBTTagCompound nbt = stack.getTag();
-        return nbt != null && nbt.contains( NBT_ID ) ? nbt.getInt( NBT_ID ) : -1;
+        CompoundTag nbt = stack.getTag();
+        return nbt != null && nbt.containsKey( NBT_ID ) ? nbt.getInt( NBT_ID ) : -1;
     }
 
     default String getLabel( @Nonnull ItemStack stack )

src/main/java/dan200/computercraft/shared/computer/items/ItemComputer.java

@@ -9,13 +9,13 @@ package dan200.computercraft.shared.computer.items;
 import dan200.computercraft.shared.computer.blocks.BlockComputer;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
 import net.minecraft.item.ItemStack;
-import net.minecraft.util.text.TextComponentString;
+import net.minecraft.network.chat.TextComponent;
 
 import javax.annotation.Nonnull;
 
 public class ItemComputer extends ItemComputerBase
 {
-    public ItemComputer( BlockComputer block, Properties settings )
+    public ItemComputer( BlockComputer block, Settings settings )
     {
         super( block, settings );
     }
@@ -24,7 +24,7 @@ public class ItemComputer extends ItemComputerBase
     {
         ItemStack result = new ItemStack( this );
         if( id >= 0 ) result.getOrCreateTag().putInt( NBT_ID, id );
-        if( label != null ) result.setDisplayName( new TextComponentString( label ) );
+        if( label != null ) result.setDisplayName( new TextComponent( label ) );
         return result;
     }
 

src/main/java/dan200/computercraft/shared/computer/items/ItemComputerBase.java

@@ -12,39 +12,39 @@ import dan200.computercraft.api.filesystem.IMount;
 import dan200.computercraft.api.media.IMedia;
 import dan200.computercraft.shared.computer.blocks.BlockComputerBase;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
-import net.minecraft.client.util.ITooltipFlag;
-import net.minecraft.item.ItemBlock;
+import net.minecraft.ChatFormat;
+import net.minecraft.client.item.TooltipContext;
+import net.minecraft.item.BlockItem;
 import net.minecraft.item.ItemStack;
-import net.minecraft.util.text.ITextComponent;
-import net.minecraft.util.text.TextComponentString;
-import net.minecraft.util.text.TextComponentTranslation;
-import net.minecraft.util.text.TextFormatting;
+import net.minecraft.network.chat.Component;
+import net.minecraft.network.chat.TextComponent;
+import net.minecraft.network.chat.TranslatableComponent;
 import net.minecraft.world.World;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 import java.util.List;
 
-public abstract class ItemComputerBase extends ItemBlock implements IComputerItem, IMedia
+public abstract class ItemComputerBase extends BlockItem implements IComputerItem, IMedia
 {
     private final ComputerFamily family;
 
-    public ItemComputerBase( BlockComputerBase<?> block, Properties settings )
+    public ItemComputerBase( BlockComputerBase<?> block, Settings settings )
     {
         super( block, settings );
         family = block.getFamily();
     }
 
     @Override
-    public void addInformation( @Nonnull ItemStack stack, @Nullable World world, @Nonnull List<ITextComponent> list, @Nonnull ITooltipFlag options )
+    public void buildTooltip( @Nonnull ItemStack stack, @Nullable World world, @Nonnull List<Component> list, @Nonnull TooltipContext options )
     {
         if( options.isAdvanced() )
         {
             int id = getComputerID( stack );
             if( id >= 0 )
             {
-                list.add( new TextComponentTranslation( "gui.computercraft.tooltip.computer_id", id )
-                    .applyTextStyle( TextFormatting.GRAY ) );
+                list.add( new TranslatableComponent( "gui.computercraft.tooltip.computer_id", id )
+                    .applyFormat( ChatFormat.GRAY ) );
             }
         }
     }
@@ -52,7 +52,7 @@ public abstract class ItemComputerBase extends ItemBlock implements IComputerIte
     @Override
     public String getLabel( @Nonnull ItemStack stack )
     {
-        return IComputerItem.super.getLabel( stack );
+        return stack.hasDisplayName() ? stack.getDisplayName().getString() : null;
     }
 
     @Override
@@ -68,11 +68,11 @@ public abstract class ItemComputerBase extends ItemBlock implements IComputerIte
     {
         if( label != null )
         {
-            stack.setDisplayName( new TextComponentString( label ) );
+            stack.setDisplayName( new TextComponent( label ) );
         }
         else
         {
-            stack.clearCustomName();
+            stack.removeDisplayName();
         }
         return true;
     }