Bump versions

This is still not 100% perfect - we don't drop them when in creative.
However, it's a notable improvement on what it was.

Closes #174

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 '0.2.2-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 +51,29 @@ 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:0.4.2+build.132"
+    modCompile "net.fabricmc:fabric:0.2.7+build.126"
 
-    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"
+    /*
+    modCompile "net.fabricmc:fabric-lib:0.1.0"
+    modCompile "net.fabricmc:fabric-networking:0.1.0"
+    modCompile "net.fabricmc:fabric-networking-blockentity:0.1.0"
+    modCompile "net.fabricmc:fabric-object-builders:0.1.0"
+    modCompile "net.fabricmc:fabric-containers:0.1.0"
+    modCompile "net.fabricmc:fabric-item-groups:0.1.0"
+    modCompile "net.fabricmc:fabric-client-registries:0.1.0"
+    modCompile "net.fabricmc:fabric-commands:0.1.0"
+    modCompile "net.fabricmc:fabric-events-lifecycle:0.1.0"
+    modCompile "net.fabricmc:fabric-events-interaction:0.1.0"
+    modCompile "net.fabricmc:fabric-resource-loader:0.1.0"
+    */
 
-    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 +84,7 @@ dependencies {
 sourceSets {
     main {
         java {
-            exclude 'dan200/computercraft/shared/integration/mcmp'
-            exclude 'dan200/computercraft/shared/integration/charset'
+            exclude 'dan200/computercraft/shared/integration'
         }
     }
 }
@@ -213,7 +189,7 @@ processResources {
     inputs.property "commithash", hash
 
     from(sourceSets.main.resources.srcDirs) {
-        include 'META-INF/mods.toml'
+        include 'fabric.mods.json'
         include 'data/computercraft/lua/rom/help/credits.txt'
 
         expand 'version': mod_version,
@@ -222,7 +198,7 @@ processResources {
     }
 
     from(sourceSets.main.resources.srcDirs) {
-        exclude 'META-INF/mods.toml'
+        exclude 'fabric.mods.json'
         exclude 'data/computercraft/lua/rom/help/credits.txt'
     }
 }
@@ -273,7 +249,8 @@ curseforge {
     apiKey = project.hasProperty('curseForgeApiKey') ? project.curseForgeApiKey : ''
     project {
         id = '282001'
-        releaseType = 'beta'
+        addGameVersion '1.14-Snapshot'
+        releaseType = 'alpha'
         changelog = "Release notes can be found on the GitHub repository (https://github.com/SquidDev-CC/CC-Tweaked/releases/tag/v${mc_version}-${mod_version})."
     }
 }
@@ -335,7 +312,7 @@ githubRelease {
     token project.hasProperty('githubApiKey') ? project.githubApiKey : ''
     owner 'SquidDev-CC'
     repo 'CC-Tweaked'
-    targetCommitish "mc-1.13.x" // TODO: Pull from GrGit
+    targetCommitish "mc-1.14-fabric" // TODO: Pull from GrGit
 
     tagName "v${mc_version}-${mod_version}"
     releaseName "[${mc_version}] ${mod_version}"
@@ -358,7 +335,7 @@ test {
 }
 
 gradle.projectsEvaluated {
-    reobfJar.dependsOn proguardMove
+    remapJar.dependsOn proguardMove
 
     tasks.withType(JavaCompile) {
         options.compilerArgs << "-Xlint" << "-Xlint:-processing" // Causes Forge build to fail << "-Werror"

gradle.properties

@@ -2,6 +2,5 @@
 mod_version=1.82.3
 
 # Minecraft properties
-mc_version=1.13.2
-forge_version=25.0.175
-mappings_version=20190424-1.13.2
+mc_version=1.14
+mappings_version=1

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 +30,14 @@ 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.minecraft.resource.ReloadableResourceManager;
+import net.minecraft.util.Identifier;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
@@ -45,8 +46,7 @@ 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 +184,22 @@ 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( net.fabricmc.loader.api.FabricLoader.getInstance().getEnvironmentType() == EnvType.CLIENT )
+        {
+            ComputerCraftProxyClient.setup();
+        }
     }
 
     public static String getVersion()
@@ -196,17 +209,17 @@ 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.ItemProvider;
 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, ItemProvider 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, ItemProvider 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.ItemProvider;
 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, ItemProvider item )
     {
-        this( id, adjective, new ItemStack( item ) );
+        this( identifier, adjective, new ItemStack( item ) );
     }
 
-    protected AbstractPocketUpgrade( ResourceLocation id, IItemProvider item )
+    protected AbstractPocketUpgrade( Identifier id, ItemProvider 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 +1,26 @@
+/*
+ * 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 net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.server.network.ServerPlayerInteractionManager;
+import net.minecraft.server.world.ServerWorld;
+
+/**
+ * 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 ) );
+    }
+}

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 +7,23 @@
 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.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 java.util.HashSet;
-import java.util.Map;
 
 /**
  * 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[] {
@@ -70,37 +57,38 @@ public final class ClientRegistry
 
     private ClientRegistry() {}
 
-    @SubscribeEvent
+    /*
+    TODO: @SubscribeEvent
     public static void registerModels( ModelRegistryEvent event )
     {
         ModelLoaderRegistry.registerLoader( TurtleModelLoader.INSTANCE );
     }
 
-    @SubscribeEvent
+    TODO: @SubscribeEvent
     public static void onTextureStitchEvent( TextureStitchEvent.Pre event )
     {
-        IResourceManager manager = Minecraft.getInstance().getResourceManager();
+        ResourceManager manager = MinecraftClient.getInstance().getResourceManager();
         for( String extra : EXTRA_TEXTURES )
         {
-            event.getMap().registerSprite( manager, new ResourceLocation( ComputerCraft.MOD_ID, extra ) );
+            event.getMap().registerSprite( manager, new Identifier( ComputerCraft.MOD_ID, extra ) );
         }
     }
 
-    @SubscribeEvent
+    TODO: @SubscribeEvent
     public static void onModelBakeEvent( ModelBakeEvent event )
     {
         // Load all extra models
         ModelLoader loader = event.getModelLoader();
-        Map<ModelResourceLocation, IBakedModel> registry = event.getModelRegistry();
+        Map<ModelIdentifier, BakedModel> registry = event.getModelRegistry();
 
         for( String model : EXTRA_MODELS )
         {
-            IBakedModel bakedModel = bake( loader, loader.getUnbakedModel( new ResourceLocation( ComputerCraft.MOD_ID, "item/" + model ) ) );
+            BakedModel bakedModel = bake( loader, loader.getOrLoadModel( new Identifier( ComputerCraft.MOD_ID, "item/" + model ) ) );
 
             if( bakedModel != null )
             {
                 registry.put(
-                    new ModelResourceLocation( new ResourceLocation( ComputerCraft.MOD_ID, model ), "inventory" ),
+                    new ModelIdentifier( new Identifier( ComputerCraft.MOD_ID, model ), "inventory" ),
                     bakedModel
                 );
             }
@@ -108,31 +96,25 @@ public final class ClientRegistry
 
         // 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" ) ) )
+            new ModelIdentifier( new Identifier( ComputerCraft.MOD_ID, "turtle_normal" ), "inventory" ),
+            bake( loader, TurtleModelLoader.INSTANCE.loadModel( new Identifier( 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" ) ) )
+            new ModelIdentifier( new Identifier( ComputerCraft.MOD_ID, "turtle_advanced" ), "inventory" ),
+            bake( loader, TurtleModelLoader.INSTANCE.loadModel( new Identifier( 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 +131,16 @@ 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.client.MinecraftClient;
+import net.minecraft.client.font.TextRenderer;
+import net.minecraft.client.gui.hud.ChatHud;
+import net.minecraft.client.util.TextComponentUtil;
+import net.minecraft.text.TextComponent;
+import net.minecraft.text.TextFormat;
 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 TextComponent getPadding( TextComponent 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 ), TextFormat.GRAY );
     }
 
     @Override
@@ -56,34 +56,34 @@ public class ClientTableFormatter implements TableFormatter
     }
 
     @Override
-    public int getWidth( ITextComponent component )
+    public int getWidth( TextComponent component )
     {
         return renderer().getStringWidth( component.getFormattedText() );
     }
 
     @Override
-    public void writeLine( int id, ITextComponent component )
+    public void writeLine( int id, TextComponent 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<TextComponent> 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;
@@ -13,16 +14,17 @@ 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.ContainerScreen;
+import net.minecraft.container.Container;
+import net.minecraft.entity.player.PlayerInventory;
+import net.minecraft.text.StringTextComponent;
+import net.minecraft.util.Identifier;
 
-public class GuiComputer extends GuiContainer
+public class GuiComputer<T extends Container> extends ContainerScreen<T>
 {
-    private static final ResourceLocation BACKGROUND_NORMAL = new ResourceLocation( "computercraft", "textures/gui/corners_normal.png" );
-    private static final ResourceLocation BACKGROUND_ADVANCED = new ResourceLocation( "computercraft", "textures/gui/corners_advanced.png" );
-    private static final ResourceLocation BACKGROUND_COMMAND = new ResourceLocation( "computercraft", "textures/gui/corners_command.png" );
+    private static final Identifier BACKGROUND_NORMAL = new Identifier( "computercraft", "textures/gui/corners_normal.png" );
+    private static final Identifier BACKGROUND_ADVANCED = new Identifier( "computercraft", "textures/gui/corners_advanced.png" );
+    private static final Identifier BACKGROUND_COMMAND = new Identifier( "computercraft", "textures/gui/corners_command.png" );
 
     private final ComputerFamily m_family;
     private final ClientComputer m_computer;
@@ -32,9 +34,11 @@ 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 StringTextComponent( "" ) );
+
         m_family = family;
         m_computer = computer;
         m_termWidth = termWidth;
@@ -42,10 +46,10 @@ 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,
@@ -54,32 +58,32 @@ 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
@@ -90,7 +94,7 @@ 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;
@@ -107,34 +111,34 @@ 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, 16 );
-        drawTexturedModalRect( endX, startY - 12, 24, 28, 12, 12 );
-        drawTexturedModalRect( endX, endY, 24, 40, 12, 16 );
+        blit( startX - 12, startY - 12, 12, 28, 12, 12 );
+        blit( startX - 12, endY, 12, 40, 12, 16 );
+        blit( endX, startY - 12, 24, 28, 12, 12 );
+        blit( endX, endY, 24, 40, 12, 16 );
 
-        drawTexturedModalRect( startX, startY - 12, 0, 0, endX - startX, 12 );
-        drawTexturedModalRect( startX, endY, 0, 12, endX - startX, 16 );
+        blit( startX, startY - 12, 0, 0, endX - startX, 12 );
+        blit( startX, endY, 0, 12, endX - startX, 16 );
 
-        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

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.ContainerScreen;
+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 ContainerScreen<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.ContainerScreen;
+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 ContainerScreen<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.ContainerScreen;
+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 ContainerScreen<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 +14,14 @@ 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.ContainerScreen;
+import net.minecraft.entity.player.PlayerInventory;
+import net.minecraft.util.Identifier;
 
-public class GuiTurtle extends GuiContainer
+public class GuiTurtle extends ContainerScreen<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 +31,46 @@ 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 +89,13 @@ 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 +103,8 @@ 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 +112,8 @@ 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 );
     }
 }

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

@@ -7,6 +7,7 @@
 package dan200.computercraft.client.proxy;
 
 import dan200.computercraft.ComputerCraft;
+import dan200.computercraft.client.ClientRegistry;
 import dan200.computercraft.client.gui.*;
 import dan200.computercraft.client.render.TileEntityCableRenderer;
 import dan200.computercraft.client.render.TileEntityMonitorRenderer;
@@ -16,71 +17,51 @@ 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.render.BlockEntityRendererRegistry;
 
-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();
     }
 
     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, turtle.getAccess(), turtle.getClientComputer() ), 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 +74,5 @@ public final class ComputerCraftProxyClient
             }
         }
     }
+    */
 }

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 && player.getOffHandStack().isEmpty() )
         {
             renderItemFirstPersonCenter( pitch, equipProgress, swingProgress, stack );
         }
         else
         {
             renderItemFirstPersonSide(
-                hand == EnumHand.MAIN_HAND ? player.getPrimaryHand() : player.getPrimaryHand().opposite(),
+                hand == Hand.MAIN ? 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

@@ -6,7 +6,7 @@
 
 package dan200.computercraft.client.render;
 
-import dan200.computercraft.ComputerCraft;
+import com.mojang.blaze3d.platform.GlStateManager;
 import dan200.computercraft.client.FrameInfo;
 import dan200.computercraft.client.gui.FixedWidthFontRenderer;
 import dan200.computercraft.core.terminal.Terminal;
@@ -14,18 +14,15 @@ import dan200.computercraft.core.terminal.TextBuffer;
 import dan200.computercraft.shared.computer.core.ClientComputer;
 import dan200.computercraft.shared.pocket.items.ItemPocketComputer;
 import dan200.computercraft.shared.util.Palette;
-import net.minecraft.client.Minecraft;
-import net.minecraft.client.renderer.GlStateManager;
-import net.minecraft.client.renderer.ItemRenderer;
-import net.minecraft.client.renderer.model.IBakedModel;
-import net.minecraft.client.renderer.texture.TextureManager;
-import net.minecraft.client.renderer.texture.TextureMap;
+import net.fabricmc.api.EnvType;
+import net.fabricmc.api.Environment;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.render.item.ItemRenderer;
+import net.minecraft.client.render.model.BakedModel;
+import net.minecraft.client.render.model.json.ModelTransformation;
+import net.minecraft.client.texture.SpriteAtlasTexture;
+import net.minecraft.client.texture.TextureManager;
 import net.minecraft.item.ItemStack;
-import net.minecraftforge.api.distmarker.Dist;
-import net.minecraftforge.client.ForgeHooksClient;
-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.FONT_HEIGHT;
@@ -34,25 +31,15 @@ import static dan200.computercraft.client.gui.FixedWidthFontRenderer.FONT_WIDTH;
 /**
  * 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 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 )
     {
@@ -73,13 +60,13 @@ public final class ItemPocketRenderer extends ItemMapLikeRenderer
 
             GlStateManager.scalef( 1.0f, -1.0f, 1.0f );
 
-            Minecraft minecraft = Minecraft.getInstance();
+            MinecraftClient minecraft = MinecraftClient.getInstance();
             TextureManager textureManager = minecraft.getTextureManager();
             ItemRenderer renderItem = minecraft.getItemRenderer();
 
             // Copy of RenderItem#renderItemModelIntoGUI but without the translation or scaling
-            textureManager.bindTexture( TextureMap.LOCATION_BLOCKS_TEXTURE );
-            textureManager.getTexture( TextureMap.LOCATION_BLOCKS_TEXTURE ).setBlurMipmap( false, false );
+            textureManager.bindTexture( SpriteAtlasTexture.BLOCK_ATLAS_TEX );
+            textureManager.getTexture( SpriteAtlasTexture.BLOCK_ATLAS_TEX ).pushFilter( false, false );
 
             GlStateManager.enableRescaleNormal();
             GlStateManager.enableAlphaTest();
@@ -88,7 +75,9 @@ public final class ItemPocketRenderer extends ItemMapLikeRenderer
             GlStateManager.blendFunc( GlStateManager.SourceFactor.SRC_ALPHA, GlStateManager.DestFactor.ONE_MINUS_SRC_ALPHA );
             GlStateManager.color4f( 1.0F, 1.0F, 1.0F, 1.0F );
 
-            renderItem.renderItem( stack, transform( renderItem.getItemModelWithOverrides( stack, null, null ) ) );
+            BakedModel baked = renderItem.getModel( stack, null, null );
+            baked.getTransformation().applyGl( ModelTransformation.Type.GUI );
+            renderItem.renderItemAndGlow( stack, baked );
 
             GlStateManager.disableAlphaTest();
             GlStateManager.disableRescaleNormal();
@@ -165,10 +154,4 @@ public final class ItemPocketRenderer extends ItemMapLikeRenderer
 
         GlStateManager.enableLighting();
     }
-
-    @SuppressWarnings( { "deprecation" } )
-    private static IBakedModel transform( IBakedModel model )
-    {
-        return ForgeHooksClient.handleCameraTransforms( model, net.minecraft.client.renderer.model.ItemCameraTransforms.TransformType.GUI, false );
-    }
 }

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/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/RenderOverlayCable.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.WorldRenderer;
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.player.PlayerEntity;
+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 RenderOverlayCable
 {
     private RenderOverlayCable()
@@ -35,18 +32,18 @@ public final class RenderOverlayCable
     /**
      * 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 )
+    // TODO @SubscribeEvent
+    public static void drawHighlight()
     {
-        if( event.getTarget().type != RayTraceResult.Type.BLOCK ) return;
+        MinecraftClient mc = MinecraftClient.getInstance();
+        if( mc.hitResult == null || mc.hitResult.getType() != HitResult.Type.BLOCK ) return;
 
-        BlockPos pos = event.getTarget().getBlockPos();
-        World world = event.getPlayer().getEntityWorld();
+        BlockPos pos = ((BlockHitResult) mc.hitResult).getBlockPos();
+        World world = mc.world;
 
-        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 ) )
@@ -54,35 +51,32 @@ public final class RenderOverlayCable
             return;
         }
 
-        event.setCanceled( true );
-
-        EntityPlayer player = event.getPlayer();
-        Minecraft mc = Minecraft.getInstance();
-        float partialTicks = event.getPartialTicks();
+        PlayerEntity player = mc.player;
+        float partialTicks = mc.getTickDelta();
 
         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;
+        double x = player.prevX + (player.x - player.prevX) * partialTicks;
+        double y = player.prevY + (player.y - player.prevY) * partialTicks;
+        double z = player.prevZ + (player.z - player.prevZ) * 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 ), mc.hitResult.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() - x, pos.getY() - y, pos.getZ() - z, 0.0F, 0.0F, 0.0F, 0.4F );
 
         GlStateManager.popMatrix();
         GlStateManager.matrixMode( GL11.GL_MODELVIEW );
         GlStateManager.depthMask( true );
-        GlStateManager.enableTexture2D();
+        GlStateManager.enableTexture();
         GlStateManager.disableBlend();
     }
 }

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;
@@ -13,22 +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 org.lwjgl.opengl.GL11;
 
 import javax.annotation.Nonnull;
@@ -37,7 +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();
 
@@ -48,44 +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 )
-        );
+        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;
@@ -13,38 +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.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 )
@@ -52,7 +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 )
         {
@@ -64,11 +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 )
         {
@@ -84,21 +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 );
@@ -110,18 +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
             );
@@ -148,11 +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 )
@@ -165,12 +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 )
                     {
@@ -185,20 +194,20 @@ 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 );
+        renderManager.textureManager.bindTexture( SpriteAtlasTexture.BLOCK_ATLAS_TEX );
         renderQuads( tessellator, model.getQuads( state, null, random ), tints );
-        for( EnumFacing facing : DirectionUtil.FACINGS )
+        for( Direction facing : DirectionUtil.FACINGS )
         {
             renderQuads( tessellator, model.getQuads( state, facing, random ), tints );
         }
@@ -206,27 +215,22 @@ public class TileEntityTurtleRenderer extends TileEntityRenderer<TileTurtle>
 
     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

@@ -6,30 +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.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;
@@ -43,7 +44,7 @@ public class TurtleMultiModel implements IBakedModel
 
     @Nonnull
     @Override
-    public List<BakedQuad> getQuads( IBlockState state, EnumFacing side, @Nonnull Random rand )
+    public List<BakedQuad> getQuads( BlockState state, Direction side, Random rand )
     {
         if( side != null )
         {
@@ -57,7 +58,7 @@ 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 ), m_generalTransform );
@@ -94,42 +95,38 @@ public class TurtleMultiModel implements IBakedModel
     }
 
     @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

@@ -12,25 +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 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;
 
@@ -50,11 +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;
@@ -94,35 +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;
             }
@@ -131,22 +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() );
@@ -167,42 +173,38 @@ public class TurtleSmartItemModel implements IBakedModel
 
     @Nonnull
     @Override
-    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 );
     }
 
     @Override
-    public boolean isAmbientOcclusion()
+    public boolean useAmbientOcclusion()
     {
-        return familyModel.isAmbientOcclusion();
+        return familyModel.useAmbientOcclusion();
     }
 
     @Override
-    public boolean isGui3d()
+    public boolean hasDepthInGui()
     {
-        return familyModel.isGui3d();
+        return familyModel.hasDepthInGui();
     }
 
     @Override
-    public boolean isBuiltInRenderer()
+    public boolean isBuiltin()
     {
-        return familyModel.isBuiltInRenderer();
+        return familyModel.isBuiltin();
     }
 
-    @Nonnull
     @Override
-    public TextureAtlasSprite getParticleTexture()
+    public Sprite getSprite()
     {
-        return familyModel.getParticleTexture();
+        return null;
     }
 
-    @Nonnull
     @Override
-    @Deprecated
-    public ItemCameraTransforms getItemCameraTransforms()
+    public ModelTransformation getTransformation()
     {
-        return familyModel.getItemCameraTransforms();
+        return familyModel.getTransformation();
     }
-
 }

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 +11,9 @@ 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.*;
+import net.minecraft.util.Identifier;
+import net.minecraft.util.profiler.Profiler;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -27,7 +24,6 @@ import java.nio.channels.Channels;
 import java.nio.channels.ReadableByteChannel;
 import java.util.*;
 import java.util.concurrent.TimeUnit;
-import java.util.function.Predicate;
 
 public class ResourceMount implements IMount
 {
@@ -57,12 +53,12 @@ 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 +71,8 @@ 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 +115,7 @@ 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 +159,7 @@ 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 +215,11 @@ 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 +236,41 @@ 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 extends SupplyingResourceReloadListener<Void>
     {
         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 )
+        protected synchronized Void load( ResourceManager manager, Profiler profiler )
         {
-            // FIXME: Remove this. We need this patch in order to prevent trying to load ReloadRequirements.
-            onResourceManagerReload( manager, x -> true );
+            profiler.push( "Mount reloading" );
+            try
+            {
+                for( ResourceMount mount : mounts ) mount.load();
+            }
+            finally
+            {
+                profiler.pop();
+            }
+            return null;
         }
 
         @Override
-        public synchronized void onResourceManagerReload( @Nonnull IResourceManager manager, @Nonnull Predicate<IResourceType> predicate )
+        protected void apply( Void res, ResourceManager manager, Profiler profiler )
         {
-            for( ResourceMount mount : mounts ) mount.load();
         }
 
-        synchronized void add( IReloadableResourceManager manager, ResourceMount mount )
+        synchronized void add( ReloadableResourceManager 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 +34,219 @@ 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.block.Material;
+import net.minecraft.block.entity.BlockEntityType;
 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.item.ItemStack;
+import net.minecraft.item.Items;
+import net.minecraft.item.BlockItem;
+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 +255,31 @@ 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 +290,16 @@ 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.server.command.ServerCommandSource;
+import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.server.world.ServerWorld;
+import net.minecraft.text.StringTextComponent;
+import net.minecraft.text.TextComponent;
 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 TextComponent linkComputer( ServerCommandSource source, ServerComputer serverComputer, int computerId )
     {
-        ITextComponent out = new TextComponentString( "" );
+        TextComponent out = new StringTextComponent( "" );
 
         // 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 TextComponent 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()];
+        TextComponent[] headers = new TextComponent[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() );
+            TextComponent computerComponent = linkComputer( source, serverComputer, entry.getComputerId() );
 
-            ITextComponent[] row = new ITextComponent[1 + fields.size()];
+            TextComponent[] row = new TextComponent[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 +8,17 @@ 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.server.command.ServerCommandSource;
+import net.minecraft.text.StringTextComponent;
+import net.minecraft.text.TextComponent;
+import net.minecraft.text.TranslatableTextComponent;
+import net.minecraft.text.event.ClickEvent;
+import net.minecraft.text.event.HoverEvent;
 
-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 +27,36 @@ 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 );
+        StringTextComponent name = new StringTextComponent( 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 TranslatableTextComponent( "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.text.TranslatableTextComponent;
 
 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 TranslatableTextComponent( key ) );
     }
 
     private static DynamicCommandExceptionType translated1( String key )
     {
-        return new DynamicCommandExceptionType( x -> new TextComponentTranslation( key, x ) );
+        return new DynamicCommandExceptionType( x -> new TranslatableTextComponent( key, x ) );
     }
 
     private static Dynamic2CommandExceptionType translated2( String key )
     {
-        return new Dynamic2CommandExceptionType( ( x, y ) -> new TextComponentTranslation( key, x, y ) );
+        return new Dynamic2CommandExceptionType( ( x, y ) -> new TranslatableTextComponent( 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.text.StringTextComponent;
+import net.minecraft.text.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 );
+            TextComponent 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 StringTextComponent( 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.server.command.ServerCommandSource;
+import net.minecraft.text.StringTextComponent;
+import net.minecraft.text.TextComponent;
+import net.minecraft.text.TextFormat;
+import net.minecraft.text.event.ClickEvent;
 
 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 TextFormat HEADER = TextFormat.LIGHT_PURPLE;
+    private static final TextFormat SYNOPSIS = TextFormat.AQUA;
+    private static final TextFormat NAME = TextFormat.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 TextComponent 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" ) );
+        TextComponent output = new StringTextComponent( "" )
+            .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 );
+            TextComponent 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 +6,83 @@
 
 package dan200.computercraft.shared.command.text;
 
+import net.minecraft.text.*;
+import net.minecraft.text.event.ClickEvent;
+import net.minecraft.text.event.HoverEvent;
 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 TextFormat HEADER = TextFormat.LIGHT_PURPLE;
 
     private ChatHelpers() {}
 
-    public static ITextComponent coloured( String text, TextFormatting colour )
+    public static TextComponent coloured( String text, TextFormat colour )
     {
-        ITextComponent component = new TextComponentString( text == null ? "" : text );
+        TextComponent component = new StringTextComponent( text == null ? "" : text );
         component.getStyle().setColor( colour );
         return component;
     }
 
-    public static <T extends ITextComponent> T coloured( T component, TextFormatting colour )
+    public static <T extends TextComponent> T coloured( T component, TextFormat colour )
     {
         component.getStyle().setColor( colour );
         return component;
     }
 
-    public static ITextComponent text( String text )
+    public static TextComponent text( String text )
     {
-        return new TextComponentString( text == null ? "" : text );
+        return new StringTextComponent( text == null ? "" : text );
     }
 
-    public static ITextComponent translate( String text )
+    public static TextComponent translate( String text )
     {
-        return new TextComponentTranslation( text == null ? "" : text );
+        return new TranslatableTextComponent( text == null ? "" : text );
     }
 
-    public static ITextComponent translate( String text, Object... args )
+    public static TextComponent translate( String text, Object... args )
     {
-        return new TextComponentTranslation( text == null ? "" : text, args );
+        return new TranslatableTextComponent( text == null ? "" : text, args );
     }
 
-    public static ITextComponent list( ITextComponent... children )
+    public static TextComponent list( TextComponent... children )
     {
-        ITextComponent component = new TextComponentString( "" );
-        for( ITextComponent child : children )
+        TextComponent component = new StringTextComponent( "" );
+        for( TextComponent child : children )
         {
-            component.appendSibling( child );
+            component.append( child );
         }
         return component;
     }
 
-    public static ITextComponent position( BlockPos pos )
+    public static TextComponent 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 TextComponent 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" ), TextFormat.GREEN )
+            : coloured( translate( "commands.computercraft.generic.no" ), TextFormat.RED );
     }
 
-    public static ITextComponent link( ITextComponent component, String command, ITextComponent toolTip )
+    public static TextComponent link( TextComponent component, String command, TextComponent toolTip )
     {
         Style style = component.getStyle();
 
-        if( style.getColor() == null ) style.setColor( TextFormatting.YELLOW );
+        if( style.getColor() == null ) style.setColor( TextFormat.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 TextComponent 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.server.command.ServerCommandSource;
+import net.minecraft.text.StringTextComponent;
+import net.minecraft.text.TextComponent;
 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 @Nullable
+    TextComponent getPadding( TextComponent component, int width )
     {
         int extraWidth = width - getWidth( component );
         if( extraWidth <= 0 ) return null;
-        return new TextComponentString( StringUtils.repeat( ' ', extraWidth ) );
+        return new StringTextComponent( StringUtils.repeat( ' ', extraWidth ) );
     }
 
     @Override
@@ -38,13 +38,13 @@ public class ServerTableFormatter implements TableFormatter
     }
 
     @Override
-    public int getWidth( ITextComponent component )
+    public int getWidth( TextComponent component )
     {
-        return component.getString().length();
+        return component.getText().length();
     }
 
     @Override
-    public void writeLine( int id, ITextComponent component )
+    public void writeLine( int id, TextComponent 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.server.command.ServerCommandSource;
+import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.text.TextComponent;
 
 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 TextComponent[] headers;
+    private final ArrayList<TextComponent[]> rows = new ArrayList<>();
     private int additional;
 
-    public TableBuilder( int id, @Nonnull ITextComponent... headers )
+    public TableBuilder( int id, @Nonnull TextComponent... 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 TextComponent[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 TextComponent... 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 TextComponent[] getHeaders()
     {
         return headers;
     }
 
     @Nonnull
-    public List<ITextComponent[]> getRows()
+    public List<TextComponent[]> 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.text.StringTextComponent;
+import net.minecraft.text.TextComponent;
+import net.minecraft.text.TextFormat;
 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 );
+    TextComponent SEPARATOR = coloured( "| ", TextFormat.GRAY );
+    TextComponent HEADER = coloured( "=", TextFormat.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 );
+    TextComponent getPadding( TextComponent 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( TextComponent component );
 
-    void writeLine( int id, ITextComponent component );
+    void writeLine( int id, TextComponent 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();
+        TextComponent[] headers = table.getHeaders();
         if( headers != null )
         {
             for( int i = 0; i < columns; i++ ) maxWidths[i] = getWidth( headers[i] );
         }
 
-        for( ITextComponent[] row : table.getRows() )
+        for( TextComponent[] 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( "" );
+            StringTextComponent line = new StringTextComponent( "" );
             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] );
+                TextComponent 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 ), TextFormat.GRAY ) );
         }
 
-        for( ITextComponent[] row : table.getRows() )
+        for( TextComponent[] row : table.getRows() )
         {
-            TextComponentString line = new TextComponentString( "" );
+            StringTextComponent line = new StringTextComponent( "" );
             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] );
+                TextComponent 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() ), TextFormat.AQUA ) );
         }
 
         return rowId - table.getId();

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

@@ -7,26 +7,26 @@
 package dan200.computercraft.shared.common;
 
 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, BlockEntityType<? extends TileGeneric> type )
     {
         super( settings );
         this.type = type;
@@ -34,58 +34,45 @@ public abstract class BlockGeneric extends Block
 
     @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.SpecialRecipeSerializer;
+import net.minecraft.recipe.crafting.SpecialCraftingRecipe;
+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

@@ -10,15 +10,15 @@ import dan200.computercraft.shared.computer.core.ComputerFamily;
 import dan200.computercraft.shared.computer.core.ComputerState;
 import dan200.computercraft.shared.computer.items.ComputerItemFactory;
 import net.minecraft.block.Block;
-import net.minecraft.block.state.IBlockState;
-import net.minecraft.item.BlockItemUseContext;
+import net.minecraft.block.BlockState;
+import net.minecraft.block.entity.BlockEntityType;
+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, BlockEntityType<? 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 );
+        builder.with( 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 net.minecraft.block.BlockState;
+import net.minecraft.block.entity.BlockEntity;
+import net.minecraft.block.entity.BlockEntityType;
+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, BlockEntityType<? 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.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.text.StringTextComponent;
+import net.minecraft.text.TextComponent;
+import net.minecraft.text.TranslatableTextComponent;
+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( TextComponent 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 StringTextComponent( 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 TranslatableTextComponent( "advMode.notEnabled" ), true );
             return false;
         }
-        else if( !player.canUseCommandBlock() )
+        else if( !player.isCreativeLevelTwoOp() )
         {
-            player.sendStatusMessage( new TextComponentTranslation( "advMode.notAllowed" ), true );
+            player.addChatMessage( new TranslatableTextComponent( "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.text.StringTextComponent;
+import net.minecraft.text.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 TextComponent getName()
     {
-        return hasCustomName() ? new TextComponentString( m_label ) : getBlockState().getBlock().getNameTextComponent();
+        return hasCustomName() ? new StringTextComponent( m_label ) : getCachedState().getBlock().getTextComponent();
     }
 
     @Override
@@ -449,8 +452,8 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
 
     @Nullable
     @Override
-    public ITextComponent getCustomName()
+    public TextComponent getCustomName()
     {
-        return hasCustomName() ? new TextComponentString( m_label ) : null;
+        return hasCustomName() ? new StringTextComponent( 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.StringRepresentable;
 
 import javax.annotation.Nonnull;
 
-public enum ComputerState implements IStringSerializable
+public enum ComputerState implements StringRepresentable
 {
     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;
     }
@@ -155,39 +154,41 @@ 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 = createTerminalPacket();
-            for( EntityPlayer player : server.getPlayerList().getPlayers() )
+            for( PlayerEntity player : server.getPlayerManager().getPlayerList() )
             {
                 if( isInteracting( player ) ) NetworkHandler.sendToPlayer( player, packet );
             }
         }
     }
 
-    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() );
@@ -196,7 +197,9 @@ 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 )
@@ -307,13 +310,13 @@ 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
@@ -343,7 +346,7 @@ 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
@@ -353,18 +356,18 @@ 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.server.MinecraftServer;
-import net.minecraft.util.text.TextComponentTranslation;
+import net.minecraft.text.TranslatableTextComponent;
 
 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 TranslatableTextComponent( "advMode.notEnabled" ), false );
                     return false;
                 }
-                else if( !player.canUseCommandBlock() )
+                else if( !player.isCreativeLevelTwoOp() )
                 {
-                    player.sendStatusMessage( new TextComponentTranslation( "advMode.notAllowed" ), false );
+                    player.addChatMessage( new TranslatableTextComponent( "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.text.StringTextComponent;
 
 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 StringTextComponent( 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.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.text.StringTextComponent;
+import net.minecraft.text.TextComponent;
+import net.minecraft.text.TextFormat;
+import net.minecraft.text.TranslatableTextComponent;
 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<TextComponent> 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 TranslatableTextComponent( "gui.computercraft.tooltip.computer_id", id )
+                    .applyFormat( TextFormat.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 StringTextComponent( label ) );
         }
         else
         {
-            stack.clearCustomName();
+            stack.removeDisplayName();
         }
         return true;
     }

src/main/java/dan200/computercraft/shared/computer/recipe/ComputerConvertRecipe.java

@@ -7,12 +7,12 @@
 package dan200.computercraft.shared.computer.recipe;
 
 import dan200.computercraft.shared.computer.items.IComputerItem;
-import net.minecraft.inventory.IInventory;
+import net.minecraft.inventory.CraftingInventory;
 import net.minecraft.item.ItemStack;
-import net.minecraft.item.crafting.Ingredient;
-import net.minecraft.item.crafting.ShapedRecipe;
-import net.minecraft.util.NonNullList;
-import net.minecraft.util.ResourceLocation;
+import net.minecraft.recipe.Ingredient;
+import net.minecraft.recipe.crafting.ShapedRecipe;
+import net.minecraft.util.DefaultedList;
+import net.minecraft.util.Identifier;
 import net.minecraft.world.World;
 
 import javax.annotation.Nonnull;
@@ -24,7 +24,7 @@ public abstract class ComputerConvertRecipe extends ShapedRecipe
 {
     private final String group;
 
-    public ComputerConvertRecipe( ResourceLocation identifier, String group, int width, int height, NonNullList<Ingredient> ingredients, ItemStack result )
+    public ComputerConvertRecipe( Identifier identifier, String group, int width, int height, DefaultedList<Ingredient> ingredients, ItemStack result )
     {
         super( identifier, group, width, height, ingredients, result );
         this.group = group;
@@ -34,13 +34,13 @@ public abstract class ComputerConvertRecipe extends ShapedRecipe
     protected abstract ItemStack convert( @Nonnull IComputerItem item, @Nonnull ItemStack stack );
 
     @Override
-    public boolean matches( @Nonnull IInventory inventory, @Nonnull World world )
+    public boolean matches( @Nonnull CraftingInventory inventory, @Nonnull World world )
     {
-        if( !super.matches( inventory, world ) ) return false;
+        if( !method_17728( inventory, world ) ) return false;
 
-        for( int i = 0; i < inventory.getSizeInventory(); i++ )
+        for( int i = 0; i < inventory.getInvSize(); i++ )
         {
-            if( inventory.getStackInSlot( i ).getItem() instanceof IComputerItem ) return true;
+            if( inventory.getInvStack( i ).getItem() instanceof IComputerItem ) return true;
         }
 
         return false;
@@ -48,12 +48,12 @@ public abstract class ComputerConvertRecipe extends ShapedRecipe
 
     @Nonnull
     @Override
-    public ItemStack getCraftingResult( @Nonnull IInventory inventory )
+    public ItemStack craft( @Nonnull CraftingInventory inventory )
     {
         // Find our computer item and convert it.
-        for( int i = 0; i < inventory.getSizeInventory(); i++ )
+        for( int i = 0; i < inventory.getInvSize(); i++ )
         {
-            ItemStack stack = inventory.getStackInSlot( i );
+            ItemStack stack = inventory.getInvStack( i );
             if( stack.getItem() instanceof IComputerItem ) return convert( (IComputerItem) stack.getItem(), stack );
         }