Initial update to Fabric

build.gradle

@@ -1,25 +1,16 @@
 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:3.0.115'
         classpath 'net.sf.proguard:proguard-gradle:6.1.0beta2'
         classpath 'org.ajoberstar.grgit:grgit-gradle:3.0.0'
     }
 }
 
 plugins {
+    id 'fabric-loom' version '0.2.0-SNAPSHOT'
     id 'com.matthewprenger.cursegradle' version '1.2.0'
 }
 
-apply plugin: 'net.minecraftforge.gradle'
 apply plugin: 'org.ajoberstar.grgit'
 apply plugin: 'maven-publish'
 apply plugin: 'maven'
@@ -30,38 +21,10 @@
 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"
@@ -87,15 +50,21 @@ accessTransformer file('src/main/resources/META-INF/accesstransformer.cfg')
 }
 
 dependencies {
-    minecraft "net.minecraftforge:forge:${mc_version}-${forge_version}"
+    minecraft "com.mojang:minecraft:${mc_version}"
+    mappings "net.fabricmc:yarn:${mc_version}.${mappings_version}"
+    modCompile "net.fabricmc:fabric-loader:0.3.7.109"
+    modCompile "net.fabricmc:fabric:0.2.6.117"
 
-    compileOnly "mezz.jei:jei-1.13.2:5.0.0.8:api"
+    // compileOnly "mezz.jei:jei-1.13.2:5.0.0.8:api"
     // deobfProvided "pl.asie:Charset-Lib:0.5.4.6"
     // deobfProvided "MCMultiPart2:MCMultiPart:2.5.3"
 
-    deobf "mezz.jei:jei-1.13.2:5.0.0.8"
+    // deobf "mezz.jei:jei-1.13.2:5.0.0.8"
+
+    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'
@@ -106,8 +75,7 @@ accessTransformer file('src/main/resources/META-INF/accesstransformer.cfg')
 sourceSets {
     main {
         java {
-            exclude 'dan200/computercraft/shared/integration/mcmp'
+            exclude 'dan200/computercraft/shared/integration'
-            exclude 'dan200/computercraft/shared/integration/charset'
         }
     }
 }
@@ -212,7 +180,7 @@ task proguardMove(dependsOn: proguard) {
     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,
@@ -221,7 +189,7 @@ task proguardMove(dependsOn: proguard) {
     }
 
     from(sourceSets.main.resources.srcDirs) {
-        exclude 'META-INF/mods.toml'
+        exclude 'fabric.mods.json'
         exclude 'data/computercraft/lua/rom/help/credits.txt'
     }
 }
@@ -272,7 +240,8 @@ task compressJson(dependsOn: jar) {
     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})."
     }
 }
@@ -338,7 +307,7 @@ task compressJson(dependsOn: jar) {
 }
 
 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=1.82.0
 
 # Minecraft properties
-mc_version=1.13.2
+mc_version=19w14a
-forge_version=25.0.100
+mappings_version=3
-mappings_version=20190327-1.13.2

gradle/wrapper/gradle-wrapper.properties

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

settings.gradle

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

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

@@ -8,10 +8,10 @@
 
 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.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.fabricmc.api.EnvType;
-import net.minecraft.util.ResourceLocation;
+import net.fabricmc.api.ModInitializer;
-import net.minecraftforge.fml.common.Mod;
+import net.minecraft.resource.ReloadableResourceManager;
-import net.minecraftforge.fml.server.ServerLifecycleHooks;
+import net.minecraft.util.Identifier;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
@@ -45,8 +46,7 @@
 import java.util.EnumSet;
 import java.util.concurrent.TimeUnit;
 
-@Mod( ComputerCraft.MOD_ID )
+public final class ComputerCraft implements ModInitializer
-public final class ComputerCraft
 {
     public static final String MOD_ID = "computercraft";
 
@@ -184,9 +184,22 @@ public static final class PocketUpgrades
     // 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 static String getVersion()
 
     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

@@ -21,16 +21,16 @@
 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.block.entity.BlockEntity;
-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 java.io.File;
@@ -52,7 +52,7 @@ public String getInstalledVersion()
     @Override
     public int createUniqueNumberedSaveDir( @Nonnull World world, @Nonnull String parentSubPath )
     {
-        return IDAssigner.getNextId( parentSubPath );
+        return IDAssigner.getNextId( world, parentSubPath );
     }
 
     @Override
@@ -60,7 +60,7 @@ public IWritableMount createSaveDirMount( @Nonnull World world, @Nonnull String
     {
         try
         {
-            return new FileMount( new File( IDAssigner.getDir(), subPath ), capacity );
+            return new FileMount( new File( IDAssigner.getDir( world ), subPath ), capacity );
         }
         catch( Exception e )
         {
@@ -93,7 +93,7 @@ public void registerBundledRedstoneProvider( @Nonnull IBundledRedstoneProvider p
     }
 
     @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 );
     }
@@ -129,12 +129,17 @@ public IWiredNode createWiredNodeForElement( @Nonnull IWiredElement element )
     }
 
     @Override
-    public 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 );
+        BlockEntity tile = world.getBlockEntity( pos );
-        if( tile == null ) return null;
+        if( tile instanceof TileCable )
-
+        {
-        LazyOptional<IWiredElement> element = tile.getCapability( CapabilityWiredElement.CAPABILITY, side );
+            return ((TileCable) tile).getElement( side );
-        return CapabilityWiredElement.unwrap( element );
+        }
+        else if( tile instanceof TileWiredModemFull )
+        {
+            return ((TileWiredModemFull) tile).getElement();
+        }
+        return null;
     }
 }

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

@@ -8,10 +8,10 @@
 
 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.Identifier;
-import net.minecraft.util.ResourceLocation;
+import net.minecraft.util.SystemUtil;
-import net.minecraft.util.Util;
 
 import javax.annotation.Nonnull;
 
@@ -22,12 +22,12 @@
  */
 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 @@ protected AbstractTurtleUpgrade( ResourceLocation id, TurtleUpgradeType type, St
         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

@@ -20,9 +20,9 @@
 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 javax.annotation.Nonnull;
@@ -182,7 +182,7 @@ public static void registerBundledRedstoneProvider( @Nonnull IBundledRedstonePro
      * 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 );
     }
@@ -241,7 +241,7 @@ public static IWiredNode createWiredNodeForElement( @Nonnull IWiredElement eleme
      * @see IWiredElement#getNode()
      */
     @Nullable
-    public static IWiredElement getWiredElementAt( @Nonnull IBlockReader world, @Nonnull BlockPos pos, @Nonnull EnumFacing side )
+    public static IWiredElement getWiredElementAt( @Nonnull BlockView world, @Nonnull BlockPos pos, @Nonnull Direction side )
     {
         return getInstance().getWiredElementAt( world, pos, side );
     }
@@ -280,7 +280,7 @@ public interface IComputerCraftAPI
 
         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 );
 
@@ -292,6 +292,6 @@ public interface IComputerCraftAPI
 
         IWiredNode createWiredNodeForElement( @Nonnull IWiredElement element );
 
-        IWiredElement getWiredElementAt( @Nonnull IBlockReader world, @Nonnull BlockPos pos, @Nonnull EnumFacing side );
+        IWiredElement getWiredElementAt( @Nonnull BlockView world, @Nonnull BlockPos pos, @Nonnull Direction side );
     }
 }

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

@@ -9,7 +9,7 @@
 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.block.entity.BlockEntity;
-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;
@@ -17,7 +17,8 @@
 /**
  * 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.Identifier;
-import net.minecraft.util.ResourceLocation;
+import net.minecraft.util.SystemUtil;
-import net.minecraft.util.Util;
 
 import javax.annotation.Nonnull;
 
@@ -20,30 +20,30 @@
  */
 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 @@
 
 import dan200.computercraft.api.peripheral.IPeripheral;
 import net.minecraft.entity.Entity;
-import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.nbt.CompoundTag;
-import net.minecraft.util.ResourceLocation;
+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.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 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.inventory.Inventory;
-import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.nbt.CompoundTag;
-import net.minecraft.util.EnumFacing;
 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();
+    Inventory 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();
 
     /**
      * 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.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.fabricmc.api.EnvType;
-import net.minecraft.client.renderer.model.ModelResourceLocation;
+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.Identifier;
-import net.minecraft.util.ResourceLocation;
+import net.minecraft.util.math.Direction;
-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 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 @@ default IPeripheral createPeripheral( @Nonnull ITurtleAccess turtle, @Nonnull Tu
      * 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,
+     * Conforming implementations should fire {@code BlockEvent.BreakEvent} and {@link TurtleBlockEvent.Dig}for digging,
-     * {@link AttackEntityEvent} and {@link TurtleAttackEvent} for attacking.
+     * {@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 @@ default IPeripheral createPeripheral( @Nonnull ITurtleAccess turtle, @Nonnull Tu
      * 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 @@ default TurtleCommandResult useTool( @Nonnull ITurtleAccess turtle, @Nonnull Tur
     /**
      * 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)},
+     * This can be obtained from {@link net.minecraft.client.render.item.ItemModels#getModel(ItemStack)},
-     * {@link net.minecraft.client.renderer.model.ModelManager#getModel(ModelResourceLocation)} or any other
+     * {@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 @@ default TurtleCommandResult useTool( @Nonnull ITurtleAccess turtle, @Nonnull Tur
      * a transformation of {@code null} has the same effect as the identify matrix.
      */
     @Nonnull
-    @OnlyIn( Dist.CLIENT )
+    @Environment( EnvType.CLIENT )
-    Pair<IBakedModel, Matrix4f> getModel( @Nullable ITurtleAccess turtle, @Nonnull TurtleSide side );
+    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 @@
  * 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 @@
 
 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 @@
 /**
  * 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 TurtleAction getAction()
      * @see TurtleCommandResult#failure()
      * @deprecated Use {@link #setCanceled(boolean, String)} instead.
      */
-    @Override
     @Deprecated
     public void setCanceled( boolean cancel )
     {
@@ -63,7 +61,7 @@ public void setCanceled( boolean cancel )
      */
     public void setCanceled( boolean cancel, @Nullable String failureMessage )
     {
-        super.setCanceled( cancel );
+        this.cancelled = true;
         this.failureMessage = cancel ? failureMessage : null;
     }
 
@@ -79,4 +77,15 @@ public String getFailureMessage()
     {
         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.TurtleSide;
 import dan200.computercraft.api.turtle.TurtleVerb;
 import net.minecraft.entity.Entity;
-import net.minecraft.util.EnumFacing;
+import net.minecraft.util.math.Direction;
-import net.minecraftforge.common.util.FakePlayer;
-import net.minecraftforge.event.entity.player.AttackEntityEvent;
 
 import javax.annotation.Nonnull;
 import java.util.Objects;
@@ -21,10 +19,11 @@
 /**
  * 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.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 BlockPos getPos()
     /**
      * 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 Dig( @Nonnull ITurtleAccess turtle, @Nonnull FakePlayer player, @Nonnull
          * @return The block which is going to be broken.
          */
         @Nonnull
-        public IBlockState getBlock()
+        public BlockState getBlock()
         {
             return block;
         }
@@ -185,10 +184,10 @@ public ItemStack getStack()
      */
     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 Inspect( @Nonnull ITurtleAccess turtle, @Nonnull FakePlayer player, @Nonn
          * @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 @@
  *
  * @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 ITurtleAccess getTurtle()
     {
         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 @@
  */
 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 @@ protected TurtleInventoryEvent( @Nonnull ITurtleAccess turtle, @Nonnull TurtleAc
      * @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 IItemHandler getItemHandler()
      */
     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 static class Drop extends TurtleInventoryEvent
     {
         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.fabricmc.fabric.api.client.render.ColorProviderRegistry;
-import net.minecraft.client.renderer.model.IBakedModel;
+import net.minecraft.client.MinecraftClient;
-import net.minecraft.client.renderer.model.IUnbakedModel;
+import net.minecraft.client.render.model.BakedModel;
-import net.minecraft.client.renderer.model.ModelResourceLocation;
+import net.minecraft.client.render.model.ModelLoader;
-import net.minecraft.client.renderer.model.ModelRotation;
+import net.minecraft.client.render.model.ModelRotation;
-import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
+import net.minecraft.client.render.model.UnbakedModel;
-import net.minecraft.resources.IResourceManager;
+import net.minecraft.client.texture.SpriteAtlasTexture;
-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 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
                 );
             }
@@ -108,25 +96,25 @@ public static void onModelBakeEvent( ModelBakeEvent event )
 
         // And load the custom turtle models in too.
         registry.put(
-            new ModelResourceLocation( new ResourceLocation( ComputerCraft.MOD_ID, "turtle_normal" ), "inventory" ),
+            new ModelIdentifier( new Identifier( ComputerCraft.MOD_ID, "turtle_normal" ), "inventory" ),
-            bake( loader, TurtleModelLoader.INSTANCE.loadModel( new ResourceLocation( ComputerCraft.MOD_ID, "item/turtle_normal" ) ) )
+            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" ),
+            new ModelIdentifier( new Identifier( ComputerCraft.MOD_ID, "turtle_advanced" ), "inventory" ),
-            bake( loader, TurtleModelLoader.INSTANCE.loadModel( new ResourceLocation( ComputerCraft.MOD_ID, "item/turtle_advanced" ) ) )
+            bake( loader, TurtleModelLoader.INSTANCE.loadModel( new Identifier( ComputerCraft.MOD_ID, "item/turtle_advanced" ) ) )
         );
     }
+    */
 
-    @SubscribeEvent
+    public static void onItemColours()
-    public static void onItemColours( ColorHandlerEvent.Item event )
     {
-        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:
@@ -143,20 +131,16 @@ public static void onItemColours( ColorHandlerEvent.Item event )
         }, 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<>() );
+        model.getTextureDependencies( loader::getOrLoadModel, new HashSet<>() );
-
+        SpriteAtlasTexture sprite = MinecraftClient.getInstance().getSpriteAtlas();
-        return model.bake(
+        return model.bake( loader, sprite::getSprite, ModelRotation.X0_Y0 );
-            loader::getUnbakedModel,
-            ModelLoader.defaultTextureGetter(),
-            ModelRotation.X0_Y0, false, DefaultVertexFormats.BLOCK
-        );
     }
 }

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

@@ -10,13 +10,13 @@
 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.MinecraftClient;
-import net.minecraft.client.gui.FontRenderer;
+import net.minecraft.client.font.TextRenderer;
-import net.minecraft.client.gui.GuiNewChat;
+import net.minecraft.client.gui.hud.ChatHud;
-import net.minecraft.client.gui.GuiUtilRenderComponents;
+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 int getColumnPadding()
     }
 
     @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();
+        MinecraftClient mc = MinecraftClient.getInstance();
-        GuiNewChat chat = mc.ingameGUI.getChatGUI();
+        ChatHud chat = mc.inGameHud.getChatHud();
 
         // Trim the text if it goes over the allowed length
-        int maxWidth = MathHelper.floor( chat.getChatWidth() / chat.getScale() );
+        int maxWidth = MathHelper.floor( chat.getWidth() / chat.getScale() );
-        List<ITextComponent> list = GuiUtilRenderComponents.splitText( component, maxWidth, mc.fontRenderer, false, false );
+        List<TextComponent> list = TextComponentUtil.wrapLines( component, maxWidth, mc.textRenderer, false, false );
-        if( !list.isEmpty() ) chat.printChatMessageWithOptionalDeletion( list.get( 0 ), id );
+        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 static long getRenderFrame()
         return renderFrame;
     }
 
-    @SubscribeEvent
+    public static void onTick()
-    public static void onTick( TickEvent.ClientTickEvent event )
     {
-        if( event.phase == TickEvent.Phase.START ) tick++;
+        tick++;
     }
 
-    @SubscribeEvent
+    public static void onRenderFrame()
-    public static void onRenderTick( TickEvent.RenderTickEvent event )
     {
-        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.MinecraftClient;
-import net.minecraft.client.renderer.BufferBuilder;
+import net.minecraft.client.render.BufferBuilder;
-import net.minecraft.client.renderer.GlStateManager;
+import net.minecraft.client.render.Tessellator;
-import net.minecraft.client.renderer.Tessellator;
+import net.minecraft.client.render.VertexFormats;
-import net.minecraft.client.renderer.texture.TextureManager;
+import net.minecraft.client.texture.TextureManager;
-import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
+import net.minecraft.util.Identifier;
-import net.minecraft.util.ResourceLocation;
 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" );
+    private static final Identifier FONT = new Identifier( "computercraft", "textures/gui/term_font.png" );
-    public static final ResourceLocation BACKGROUND = new ResourceLocation( "computercraft", "textures/gui/term_background.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 static FixedWidthFontRenderer instance()
 
     private FixedWidthFontRenderer()
     {
-        m_textureManager = Minecraft.getInstance().getTextureManager();
+        m_textureManager = MinecraftClient.getInstance().getTextureManager();
     }
 
     private static void greyscaleify( double[] rgb )
@@ -64,12 +64,12 @@ private void drawChar( BufferBuilder renderer, double x, double y, int index, in
         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.vertex( x, y, 0.0 ).texture( xStart / 256.0, yStart / 256.0 ).color( r, g, b, 1.0f ).next();
-        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.vertex( x, y + FONT_HEIGHT, 0.0 ).texture( xStart / 256.0, (yStart + FONT_HEIGHT) / 256.0 ).color( r, g, b, 1.0f ).next();
-        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.vertex( x + FONT_WIDTH, y, 0.0 ).texture( (xStart + FONT_WIDTH) / 256.0, yStart / 256.0 ).color( r, g, b, 1.0f ).next();
-        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.vertex( x + FONT_WIDTH, y, 0.0 ).texture( (xStart + FONT_WIDTH) / 256.0, yStart / 256.0 ).color( r, g, b, 1.0f ).next();
-        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.vertex( x, y + FONT_HEIGHT, 0.0 ).texture( xStart / 256.0, (yStart + FONT_HEIGHT) / 256.0 ).color( r, g, b, 1.0f ).next();
-        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 + 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 @@ private void drawQuad( BufferBuilder renderer, double x, double y, int color, do
         float g = (float) colour[1];
         float b = (float) colour[2];
 
-        renderer.pos( x, y, 0.0 ).color( r, g, b, 1.0f ).endVertex();
+        renderer.vertex( x, y, 0.0 ).color( r, g, b, 1.0f ).next();
-        renderer.pos( x, y + FONT_HEIGHT, 0.0 ).color( r, g, b, 1.0f ).endVertex();
+        renderer.vertex( x, y + FONT_HEIGHT, 0.0 ).color( r, g, b, 1.0f ).next();
-        renderer.pos( x + width, y, 0.0 ).color( r, g, b, 1.0f ).endVertex();
+        renderer.vertex( x + width, y, 0.0 ).color( r, g, b, 1.0f ).next();
-        renderer.pos( x + width, y, 0.0 ).color( r, g, b, 1.0f ).endVertex();
+        renderer.vertex( x + width, y, 0.0 ).color( r, g, b, 1.0f ).next();
-        renderer.pos( x, y + FONT_HEIGHT, 0.0 ).color( r, g, b, 1.0f ).endVertex();
+        renderer.vertex( x, y + FONT_HEIGHT, 0.0 ).color( r, g, b, 1.0f ).next();
-        renderer.pos( x + width, y + FONT_HEIGHT, 0.0 ).color( r, g, b, 1.0f ).endVertex();
+        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 void drawStringBackgroundPart( int x, int y, TextBuffer backgroundColour,
     {
         // Draw the quads
         Tessellator tessellator = Tessellator.getInstance();
-        BufferBuilder renderer = tessellator.getBuffer();
+        BufferBuilder renderer = tessellator.getBufferBuilder();
-        renderer.begin( GL11.GL_TRIANGLES, DefaultVertexFormats.POSITION_COLOR );
+        renderer.begin( GL11.GL_TRIANGLES, VertexFormats.POSITION_COLOR );
         if( leftMarginSize > 0.0 )
         {
             int colour1 = "0123456789abcdef".indexOf( backgroundColour.charAt( 0 ) );
@@ -129,17 +129,17 @@ public void drawStringBackgroundPart( int x, int y, TextBuffer backgroundColour,
             }
             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();
+        BufferBuilder renderer = tessellator.getBufferBuilder();
-        renderer.begin( GL11.GL_TRIANGLES, DefaultVertexFormats.POSITION_TEX_COLOR );
+        renderer.begin( GL11.GL_TRIANGLES, VertexFormats.POSITION_UV_COLOR );
         for( int i = 0; i < s.length(); i++ )
         {
             // Switch colour
@@ -195,6 +195,6 @@ public int getStringWidth( String s )
     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.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.gui.ContainerScreen;
-import net.minecraft.client.renderer.GlStateManager;
+import net.minecraft.container.Container;
-import net.minecraft.inventory.Container;
+import net.minecraft.entity.player.PlayerInventory;
-import net.minecraft.util.ResourceLocation;
+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 Identifier BACKGROUND_NORMAL = new Identifier( "computercraft", "textures/gui/corners_normal.png" );
-    private static final ResourceLocation BACKGROUND_ADVANCED = new ResourceLocation( "computercraft", "textures/gui/corners_advanced.png" );
+    private static final Identifier BACKGROUND_ADVANCED = new Identifier( "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_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 GuiComputer( Container container, ComputerFamily family, ClientComputer c
         terminal = null;
     }
 
-    public GuiComputer( TileComputer computer )
+    public static GuiComputer<ContainerComputer> create( int id, TileComputer computer, PlayerInventory player )
     {
-        this(
+        return new GuiComputer<>(
-            new ContainerComputer( computer ),
+            new ContainerComputer( id, computer ), player,
             computer.getFamily(),
             computer.createClientComputer(),
             ComputerCraft.terminalWidth_computer,
@@ -54,32 +58,32 @@ public GuiComputer( TileComputer computer )
     }
 
     @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;
+        containerWidth = termPxWidth + 4 + 24;
-        ySize = termPxHeight + 4 + 24;
+        containerHeight = termPxHeight + 4 + 24;
 
-        super.initGui();
+        super.init();
 
-        terminal = new WidgetTerminal( mc, () -> m_computer, m_termWidth, m_termHeight, 2, 2, 2, 2 );
+        terminal = new WidgetTerminal( minecraft, () -> m_computer, m_termWidth, m_termHeight, 2, 2, 2, 2 );
-        terminalWrapper = new WidgetWrapper( terminal, 2 + 12 + guiLeft, 2 + 12 + guiTop, termPxWidth, termPxHeight );
+        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 void tick()
     }
 
     @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 void drawGuiContainerBackgroundLayer( float partialTicks, int mouseX, int
         {
             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 );
+        blit( startX - 12, startY - 12, 12, 28, 12, 12 );
-        drawTexturedModalRect( startX - 12, endY, 12, 40, 12, 16 );
+        blit( startX - 12, endY, 12, 40, 12, 16 );
-        drawTexturedModalRect( endX, startY - 12, 24, 28, 12, 12 );
+        blit( endX, startY - 12, 24, 28, 12, 12 );
-        drawTexturedModalRect( endX, endY, 24, 40, 12, 16 );
+        blit( endX, endY, 24, 40, 12, 16 );
 
-        drawTexturedModalRect( startX, startY - 12, 0, 0, endX - startX, 12 );
+        blit( startX, startY - 12, 0, 0, endX - startX, 12 );
-        drawTexturedModalRect( startX, endY, 0, 12, endX - startX, 16 );
+        blit( startX, endY, 0, 12, endX - startX, 16 );
 
-        drawTexturedModalRect( startX - 12, startY, 0, 28, 12, endY - startY );
+        blit( startX - 12, startY, 0, 28, 12, endY - startY );
-        drawTexturedModalRect( endX, startY, 36, 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.gui.ContainerScreen;
-import net.minecraft.client.renderer.GlStateManager;
+import net.minecraft.client.resource.language.I18n;
-import net.minecraft.client.resources.I18n;
+import net.minecraft.entity.player.PlayerInventory;
-import net.minecraft.util.ResourceLocation;
+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, PlayerInventory inventory )
-
-    public GuiDiskDrive( ContainerDiskDrive container )
     {
-        super( container );
+        super( container, inventory, ComputerCraft.Blocks.diskDrive.getTextComponent() );
-        m_container = container;
     }
 
     @Override
-    protected void drawGuiContainerForegroundLayer( int mouseX, int mouseY )
+    protected void drawForeground( int par1, int par2 )
     {
-        String title = m_container.getDiskDrive().getDisplayName().getString();
+        String title = getTitle().getFormattedText();
-        fontRenderer.drawString( title, (xSize - fontRenderer.getStringWidth( title )) / 2.0f, 6, 0x404040 );
+        font.draw( title, (containerWidth - font.getStringWidth( title )) / 2.0f, 6, 0x404040 );
-        fontRenderer.drawString( I18n.format( "container.inventory" ), 8, ySize - 96 + 2, 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 );
+        minecraft.getTextureManager().bindTexture( BACKGROUND );
-        drawTexturedModalRect( guiLeft, guiTop, 0, 0, xSize, ySize );
+        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.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.gui.ContainerScreen;
-import net.minecraft.client.renderer.GlStateManager;
+import net.minecraft.client.resource.language.I18n;
-import net.minecraft.client.resources.I18n;
+import net.minecraft.entity.player.PlayerInventory;
-import net.minecraft.util.ResourceLocation;
+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, PlayerInventory player )
-
-    public GuiPrinter( ContainerPrinter container )
     {
-        super( container );
+        super( container, player, ComputerCraft.Blocks.printer.getTextComponent() );
-        this.container = container;
     }
 
     @Override
-    protected void drawGuiContainerForegroundLayer( int mouseX, int mouseY )
+    protected void drawForeground( int mouseX, int mouseY )
     {
-        String title = container.getPrinter().getDisplayName().getString();
+        String title = getTitle().getFormattedText();
-        fontRenderer.drawString( title, (xSize - fontRenderer.getStringWidth( title )) / 2.0f, 6, 0x404040 );
+        font.draw( title, (containerWidth - font.getStringWidth( title )) / 2.0f, 6, 0x404040 );
-        fontRenderer.drawString( I18n.format( "container.inventory" ), 8, ySize - 96 + 2, 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 );
+        minecraft.getTextureManager().bindTexture( BACKGROUND );
-        drawTexturedModalRect( guiLeft, guiTop, 0, 0, xSize, ySize );
+        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.gui.ContainerScreen;
-import net.minecraft.client.renderer.GlStateManager;
+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 boolean keyPressed( int key, int scancode, int modifiers )
     }
 
     @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 boolean mouseScrolled( double delta )
     }
 
     @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 );
+        drawBorder( left, top, blitOffset, 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 );
+        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--;
+        blitOffset--;
-        drawDefaultBackground();
+        renderBackground();
-        zLevel++;
+        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.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.gui.ContainerScreen;
-import net.minecraft.client.renderer.GlStateManager;
+import net.minecraft.entity.player.PlayerInventory;
-import net.minecraft.util.ResourceLocation;
+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 Identifier BACKGROUND_NORMAL = new Identifier( "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_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;
+        containerWidth = 254;
-        ySize = 217;
+        containerHeight = 217;
     }
 
     @Override
-    protected void initGui()
+    protected void init()
     {
-        super.initGui();
+        super.init();
-        mc.keyboardListener.enableRepeatEvents( true );
+        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 @@ private void drawSelectionSlot( boolean advanced )
             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 );
+            minecraft.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 );
+            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 @@ protected void drawGuiContainerBackgroundLayer( float partialTicks, int mouseX,
 
         // Draw border/inventory
         GlStateManager.color4f( 1.0F, 1.0F, 1.0F, 1.0F );
-        mc.getTextureManager().bindTexture( advanced ? BACKGROUND_ADVANCED : BACKGROUND_NORMAL );
+        minecraft.getTextureManager().bindTexture( advanced ? BACKGROUND_ADVANCED : BACKGROUND_NORMAL );
-        drawTexturedModalRect( guiLeft, guiTop, 0, 0, xSize, ySize );
+        blit( left, top, 0, 0, containerWidth, containerHeight );
 
         drawSelectionSlot( advanced );
     }
@@ -110,8 +112,8 @@ protected void drawGuiContainerBackgroundLayer( float partialTicks, int mouseX,
     @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.IComputer;
 import dan200.computercraft.shared.util.Colour;
 import dan200.computercraft.shared.util.Palette;
-import net.minecraft.client.Minecraft;
+import net.minecraft.SharedConstants;
-import net.minecraft.client.gui.IGuiEventListener;
+import net.minecraft.client.MinecraftClient;
-import net.minecraft.client.renderer.BufferBuilder;
+import net.minecraft.client.gui.Element;
-import net.minecraft.client.renderer.GlStateManager;
+import net.minecraft.client.render.BufferBuilder;
-import net.minecraft.client.renderer.Tessellator;
+import net.minecraft.client.render.Tessellator;
-import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
+import net.minecraft.client.render.VertexFormats;
-import net.minecraft.util.SharedConstants;
 import org.lwjgl.glfw.GLFW;
 import org.lwjgl.opengl.GL11;
 
@@ -29,11 +29,11 @@
 
 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;
@@ -54,9 +54,9 @@ 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 +98,7 @@ public boolean keyPressed( int key, int scancode, int modifiers )
 
                 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 +118,7 @@ else if( newLineIndex2 >= 0 )
                         }
 
                         // Filter the string
-                        clipboard = SharedConstants.filterAllowedCharacters( clipboard );
+                        clipboard = SharedConstants.stripInvalidChars( clipboard );
                         if( !clipboard.isEmpty() )
                         {
                             // Clip to 512 characters and queue the event
@@ -250,14 +250,23 @@ public boolean mouseDragged( double mouseX, double mouseY, int button, double v2
     }
 
     @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;
@@ -284,7 +293,7 @@ public void update()
     }
 
     @Override
-    public void focusChanged( boolean focused )
+    public void onFocusChanged( boolean noClue, boolean focused )
     {
         if( !focused )
         {
@@ -384,15 +393,15 @@ public void draw( int originX, int originY )
                     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();
+                    BufferBuilder buffer = tesslector.getBufferBuilder();
-                    buffer.begin( GL11.GL_QUADS, DefaultVertexFormats.POSITION_TEX );
+                    buffer.begin( GL11.GL_QUADS, VertexFormats.POSITION_UV );
-                    buffer.pos( x, y + height, 0 ).tex( 0 / 256.0, height / 256.0 ).endVertex();
+                    buffer.vertex( x, y + height, 0 ).texture( 0 / 256.0, height / 256.0 ).next();
-                    buffer.pos( x + width, y + height, 0 ).tex( width / 256.0, height / 256.0 ).endVertex();
+                    buffer.vertex( x + width, y + height, 0 ).texture( width / 256.0, height / 256.0 ).next();
-                    buffer.pos( x + width, y, 0 ).tex( width / 256.0, 0 / 256.0 ).endVertex();
+                    buffer.vertex( x + width, y, 0 ).texture( width / 256.0, 0 / 256.0 ).next();
-                    buffer.pos( x, y, 0 ).tex( 0 / 256.0, 0 / 256.0 ).endVertex();
+                    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 WidgetWrapper( IGuiEventListener listener, int x, int y, int width, int h
     }
 
     @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 void onFocusChanged( boolean a, boolean b )
     {
-        return listener.canFocus();
+        listener.onFocusChanged( a, b );
     }
 
     @Override
@@ -59,9 +60,10 @@ public boolean mouseDragged( double x, double y, int button, double deltaX, doub
     }
 
     @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 int getHeight()
     {
         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;
@@ -16,70 +17,51 @@
 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.fabricmc.fabric.api.client.render.BlockEntityRendererRegistry;
-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 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 setup()
-    public static void setupClient( FMLClientSetupEvent event )
     {
         registerContainers();
 
         // Setup TESRs
-        ClientRegistry.bindTileEntitySpecialRenderer( TileMonitor.class, new TileEntityMonitorRenderer() );
+        BlockEntityRendererRegistry.INSTANCE.register( TileMonitor.class, new TileEntityMonitorRenderer() );
-        ClientRegistry.bindTileEntitySpecialRenderer( TileCable.class, new TileEntityCableRenderer() );
+        BlockEntityRendererRegistry.INSTANCE.register( TileCable.class, new TileEntityCableRenderer() );
-        ClientRegistry.bindTileEntitySpecialRenderer( TileTurtle.class, new TileEntityTurtleRenderer() );
+        BlockEntityRendererRegistry.INSTANCE.register( TileTurtle.class, new TileEntityTurtleRenderer() );
+
+        ClientRegistry.onItemColours();
     }
 
     private static void registerContainers()
     {
-        ContainerType.registerGui( TileEntityContainerType::computer, ( packet, player ) ->
+        ContainerType.registerGui( TileEntityContainerType::computer, ( id, packet, player ) ->
-            new GuiComputer( (TileComputer) packet.getTileEntity( 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 );
+            ContainerViewComputer container = new ContainerViewComputer( id, computer );
-            return new GuiComputer( container, packet.family, computer, packet.width, packet.height );
+            return new GuiComputer<>( container, player.inventory, 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() );
-            return ((BiFunction<ContainerType<?>, EntityPlayer, GuiContainer>) ContainerType.guiFactories.get( packet.getId() ))
-                .apply( type, Minecraft.getInstance().player );
         } );
     }
 
+    /*
     @Mod.EventBusSubscriber( modid = ComputerCraft.MOD_ID, value = Dist.CLIENT )
     public static final class ForgeHandlers
     {
@@ -92,4 +74,5 @@ public static void onWorldUnload( WorldEvent.Unload event )
             }
         }
     }
+    */
 }

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

@@ -6,13 +6,14 @@
 
 package dan200.computercraft.client.render;
 
-import net.minecraft.client.Minecraft;
+import com.mojang.blaze3d.platform.GlStateManager;
-import net.minecraft.client.renderer.FirstPersonRenderer;
+import dan200.computercraft.shared.mixed.MixedFirstPersonRenderer;
-import net.minecraft.client.renderer.GlStateManager;
+import net.minecraft.client.MinecraftClient;
-import net.minecraft.entity.player.EntityPlayer;
+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.AbsoluteHand;
-import net.minecraft.util.EnumHandSide;
+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 @@ protected void renderItemFirstPerson( EnumHand hand, float pitch, float equipPro
      * @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();
+        MinecraftClient minecraft = MinecraftClient.getInstance();
-        float offset = side == EnumHandSide.RIGHT ? 1f : -1f;
+        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 @@ private void renderItemFirstPersonSide( EnumHandSide side, float equipProgress,
         {
             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 @@ private void renderItemFirstPersonSide( EnumHandSide side, float equipProgress,
      * @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 @@ private void renderItemFirstPersonCenter( float pitch, float equipProgress, floa
         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;
@@ -14,19 +14,15 @@
 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.fabricmc.api.EnvType;
-import net.minecraft.client.renderer.GlStateManager;
+import net.fabricmc.api.Environment;
-import net.minecraft.client.renderer.ItemRenderer;
+import net.minecraft.client.MinecraftClient;
-import net.minecraft.client.renderer.model.IBakedModel;
+import net.minecraft.client.render.item.ItemRenderer;
-import net.minecraft.client.renderer.model.ItemCameraTransforms.TransformType;
+import net.minecraft.client.render.model.BakedModel;
-import net.minecraft.client.renderer.texture.TextureManager;
+import net.minecraft.client.render.model.json.ModelTransformation;
-import net.minecraft.client.renderer.texture.TextureMap;
+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;
@@ -35,15 +31,16 @@
 /**
  * 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 )
     {
@@ -53,6 +50,7 @@ public static void renderItem( RenderSpecificHandEvent event )
         event.setCanceled( true );
         INSTANCE.renderItemFirstPerson( event.getHand(), event.getInterpolatedPitch(), event.getEquipProgress(), event.getSwingProgress(), event.getItemStack() );
     }
+    */
 
     @Override
     protected void renderItem( ItemStack stack )
@@ -74,13 +72,13 @@ protected void renderItem( ItemStack stack )
 
             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.bindTexture( SpriteAtlasTexture.BLOCK_ATLAS_TEX );
-            textureManager.getTexture( TextureMap.LOCATION_BLOCKS_TEXTURE ).setBlurMipmap( false, false );
+            textureManager.getTexture( SpriteAtlasTexture.BLOCK_ATLAS_TEX ).pushFilter( false, false );
 
             GlStateManager.enableRescaleNormal();
             GlStateManager.enableAlphaTest();
@@ -89,9 +87,9 @@ protected void renderItem( ItemStack stack )
             GlStateManager.blendFunc( GlStateManager.SourceFactor.SRC_ALPHA, GlStateManager.DestFactor.ONE_MINUS_SRC_ALPHA );
             GlStateManager.color4f( 1.0F, 1.0F, 1.0F, 1.0F );
 
-            IBakedModel baked = renderItem.getItemModelWithOverrides( stack, null, null );
+            BakedModel baked = renderItem.getModel( stack, null, null );
-            baked = ForgeHooksClient.handleCameraTransforms( baked, TransformType.GUI, false );
+            baked.getTransformation().applyGl( ModelTransformation.Type.GUI );
-            renderItem.renderItem( stack, baked );
+            renderItem.renderItemAndGlow( stack, baked );
 
             GlStateManager.disableAlphaTest();
             GlStateManager.disableRescaleNormal();

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 @@
 /**
  * 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 static void onRenderInHand( RenderSpecificHandEvent event )
         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 @@ protected void renderItem( ItemStack stack )
         GlStateManager.enableLighting();
     }
 
-    @SubscribeEvent
+    public void renderInFrame( ItemFrameEntity entity, ItemStack stack )
-    public static void onRenderInFrame( RenderItemInFrameEvent event )
     {
-        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.render.VertexFormat;
-import net.minecraft.client.renderer.texture.TextureAtlasSprite;
+import net.minecraft.client.render.VertexFormatElement;
-import net.minecraft.client.renderer.vertex.VertexFormat;
+import net.minecraft.client.render.VertexFormats;
-import net.minecraft.util.EnumFacing;
+import net.minecraft.client.render.model.BakedQuad;
-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 javax.annotation.Nonnull;
 import javax.vecmath.Matrix4f;
-import javax.vecmath.Point3f;
+import javax.vecmath.Vector4f;
-import javax.vecmath.Vector3f;
 import java.util.List;
 
 /**
@@ -40,6 +34,11 @@ private 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 static void transformQuadsTo( List<BakedQuad> output, List<BakedQuad> inp
         }
         else
         {
-            Matrix4f normalMatrix = new Matrix4f( transform );
+            for( BakedQuad quad : input ) output.add( doTransformQuad( format, quad, transform ) );
-            normalMatrix.invert();
-            normalMatrix.transpose();
-
-            for( BakedQuad quad : input ) output.add( doTransformQuad( quad, transform, normalMatrix ) );
         }
     }
 
-    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;
-
+        return doTransformQuad( format, input, transform );
-        Matrix4f normalMatrix = new Matrix4f( transform );
-        normalMatrix.invert();
-        normalMatrix.transpose();
-        return doTransformQuad( input, transform, normalMatrix );
     }
 
-    private static BakedQuad doTransformQuad( BakedQuad input, Matrix4f positionMatrix, Matrix4f normalMatrix )
+    private static BakedQuad doTransformQuad( VertexFormat format, BakedQuad quad, Matrix4f transform )
     {
-
+        int[] vertexData = quad.getVertexData().clone();
-        BakedQuadBuilder builder = new BakedQuadBuilder( input.getFormat() );
+        int offset = 0;
-        NormalAwareTransformer transformer = new NormalAwareTransformer( builder, positionMatrix, normalMatrix );
+        BakedQuad copy = new BakedQuad( vertexData, -1, quad.getFace(), quad.getSprite() );
-        input.pipe( transformer );
+        for( int i = 0; i < format.getElementCount(); ++i ) // For each vertex element
-
-        if( transformer.areNormalsInverted() )
         {
-            builder.swap( 1, 3 );
+            VertexFormatElement element = format.getElement( i );
-            transformer.areNormalsInverted();
+            if( element.isPosition() &&
-        }
+                element.getFormat() == VertexFormatElement.Format.FLOAT &&
-
+                element.getCount() == 3 ) // When we find a position element
-        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;
+                for( int j = 0; j < 4; ++j ) // For each corner of the quad
-        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 );
+                    int start = offset + j * format.getVertexSize();
-            this.positionMatrix = positionMatrix;
+                    if( (start % 4) == 0 )
-            this.normalMatrix = normalMatrix;
-        }
-
-        @Override
-        public void setQuadOrientation( @Nonnull EnumFacing orientation )
                     {
-            super.setQuadOrientation( orientation == null ? orientation : TRSRTransformation.rotate( positionMatrix, orientation ) );
+                        start = start / 4;
-        }
 
-        @Override
+                        // Extract the position
-        public void put( int element, @Nonnull float... data )
+                        Vector4f pos = new Vector4f(
-        {
+                            Float.intBitsToFloat( vertexData[start] ),
-            switch( getVertexFormat().getElement( element ).getUsage() )
+                            Float.intBitsToFloat( vertexData[start + 1] ),
-            {
+                            Float.intBitsToFloat( vertexData[start + 2] ),
-                case POSITION:
+                            1
-                {
+                        );
-                    Point3f vec = new Point3f( data );
-                    Point3f newVec = new Point3f();
-                    positionMatrix.transform( vec, newVec );
 
-                    float[] newData = new float[4];
+                        // Transform the position
-                    newVec.get( newData );
+                        transform.transform( pos );
-                    super.put( element, newData );
 
-
+                        // Insert the position
-                    before[vertexIndex] = vec;
+                        vertexData[start] = Float.floatToRawIntBits( pos.x );
-                    after[vertexIndex] = newVec;
+                        vertexData[start + 1] = Float.floatToRawIntBits( pos.y );
-                    break;
+                        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;
-            }
-        }
-
-        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 );
                     }
                 }
             }
+            offset += element.getSize();
+        }
+        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.MinecraftClient;
-import net.minecraft.client.renderer.BufferBuilder;
+import net.minecraft.client.render.BufferBuilder;
-import net.minecraft.client.renderer.GlStateManager;
+import net.minecraft.client.render.Tessellator;
-import net.minecraft.client.renderer.GlStateManager.DestFactor;
+import net.minecraft.client.render.VertexFormats;
-import net.minecraft.client.renderer.GlStateManager.SourceFactor;
+import net.minecraft.util.Identifier;
-import net.minecraft.client.renderer.Tessellator;
-import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
-import net.minecraft.util.ResourceLocation;
 import org.lwjgl.opengl.GL11;
 
 import static dan200.computercraft.client.gui.FixedWidthFontRenderer.FONT_HEIGHT;
@@ -24,7 +24,7 @@
 
 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 static void drawText( int x, int y, int start, String[] text, String[] co
     {
         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 static void drawBorder( double x, double y, double z, int page, int pages
     {
         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();
+        BufferBuilder buffer = tessellator.getBufferBuilder();
-        buffer.begin( GL11.GL_QUADS, DefaultVertexFormats.POSITION_TEX );
+        buffer.begin( GL11.GL_QUADS, VertexFormats.POSITION_UV );
 
         int leftPages = page;
         int rightPages = pages - page - 1;
@@ -159,18 +159,18 @@ public static void drawBorder( double x, double y, double z, int page, int pages
 
     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.vertex( x, y + height, z ).texture( u / BG_SIZE, (v + height) / BG_SIZE ).next();
-        buffer.pos( x + width, y + height, z ).tex( (u + width) / BG_SIZE, (v + height) / BG_SIZE ).endVertex();
+        buffer.vertex( x + width, y + height, z ).texture( (u + width) / BG_SIZE, (v + height) / BG_SIZE ).next();
-        buffer.pos( x + width, y, z ).tex( (u + width) / BG_SIZE, v / BG_SIZE ).endVertex();
+        buffer.vertex( x + width, y, z ).texture( (u + width) / BG_SIZE, v / BG_SIZE ).next();
-        buffer.pos( x, y, z ).tex( u / BG_SIZE, v / BG_SIZE ).endVertex();
+        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.vertex( x, y + height, z ).texture( u / BG_SIZE, (v + tHeight) / BG_SIZE ).next();
-        buffer.pos( x + width, y + height, z ).tex( (u + tWidth) / BG_SIZE, (v + tHeight) / BG_SIZE ).endVertex();
+        buffer.vertex( x + width, y + height, z ).texture( (u + tWidth) / BG_SIZE, (v + tHeight) / BG_SIZE ).next();
-        buffer.pos( x + width, y, z ).tex( (u + tWidth) / BG_SIZE, v / BG_SIZE ).endVertex();
+        buffer.vertex( x + width, y, z ).texture( (u + tWidth) / BG_SIZE, v / BG_SIZE ).next();
-        buffer.pos( x, y, z ).tex( u / BG_SIZE, v / BG_SIZE ).endVertex();
+        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.block.BlockState;
-import net.minecraft.client.Minecraft;
+import net.minecraft.client.MinecraftClient;
-import net.minecraft.client.renderer.GlStateManager;
+import net.minecraft.client.render.WorldRenderer;
-import net.minecraft.client.renderer.WorldRenderer;
+import net.minecraft.entity.Entity;
-import net.minecraft.entity.player.EntityPlayer;
+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.shape.VoxelShape;
-import net.minecraft.util.math.shapes.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 @@ private RenderOverlayCable()
     /**
      * Draw an outline for a specific part of a cable "Multipart".
      *
-     * @param event The event to observe
+     * @see WorldRenderer#drawHighlightedBlockOutline(Entity, HitResult, int, float)
-     * @see WorldRenderer#drawSelectionBox(EntityPlayer, RayTraceResult, int, float)
      */
-    @SubscribeEvent
+    // TODO @SubscribeEvent
-    public static void drawHighlight( DrawBlockHighlightEvent event )
+    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();
+        BlockPos pos = ((BlockHitResult) mc.hitResult).getBlockPos();
-        World world = event.getPlayer().getEntityWorld();
+        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 ) )
@@ -54,34 +51,31 @@ public static void drawHighlight( DrawBlockHighlightEvent event )
             return;
         }
 
-        event.setCanceled( true );
+        PlayerEntity player = mc.player;
-
+        float partialTicks = mc.getTickDelta();
-        EntityPlayer player = event.getPlayer();
-        Minecraft mc = Minecraft.getInstance();
-        float partialTicks = event.getPartialTicks();
 
         GlStateManager.enableBlend();
         GlStateManager.blendFuncSeparate( GlStateManager.SourceFactor.SRC_ALPHA, GlStateManager.DestFactor.ONE_MINUS_SRC_ALPHA, GlStateManager.SourceFactor.ONE, GlStateManager.DestFactor.ZERO );
-        GlStateManager.lineWidth( Math.max( 2.5F, mc.mainWindow.getFramebufferWidth() / 1920.0F * 2.5F ) );
+        GlStateManager.lineWidth( Math.max( 2.5F, mc.window.getFramebufferWidth() / 1920.0F * 2.5F ) );
-        GlStateManager.disableTexture2D();
+        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 x = player.prevX + (player.x - player.prevX) * partialTicks;
-        double y = player.lastTickPosY + (player.posY - player.lastTickPosY) * partialTicks;
+        double y = player.prevY + (player.y - player.prevY) * partialTicks;
-        double z = player.lastTickPosZ + (player.posZ - player.lastTickPosZ) * 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

@@ -6,29 +6,27 @@
 
 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;
 import dan200.computercraft.shared.peripheral.modem.wired.CableShapes;
 import dan200.computercraft.shared.peripheral.modem.wired.TileCable;
 import net.minecraft.block.Block;
-import net.minecraft.block.state.IBlockState;
+import net.minecraft.block.BlockState;
-import net.minecraft.client.Minecraft;
+import net.minecraft.client.MinecraftClient;
-import net.minecraft.client.renderer.BufferBuilder;
+import net.minecraft.client.render.BufferBuilder;
-import net.minecraft.client.renderer.GlStateManager;
+import net.minecraft.client.render.Tessellator;
-import net.minecraft.client.renderer.Tessellator;
+import net.minecraft.client.render.VertexFormats;
-import net.minecraft.client.renderer.WorldRenderer;
+import net.minecraft.client.render.WorldRenderer;
-import net.minecraft.client.renderer.model.IBakedModel;
+import net.minecraft.client.render.block.entity.BlockEntityRenderer;
-import net.minecraft.client.renderer.texture.TextureAtlasSprite;
+import net.minecraft.client.render.model.BakedModel;
-import net.minecraft.client.renderer.tileentity.TileEntityRenderer;
+import net.minecraft.client.texture.Sprite;
-import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
+import net.minecraft.util.hit.BlockHitResult;
-import net.minecraft.util.BlockRenderLayer;
+import net.minecraft.util.hit.HitResult;
 import net.minecraft.util.math.BlockPos;
-import net.minecraft.util.math.RayTraceResult;
+import net.minecraft.util.shape.VoxelShape;
-import net.minecraft.util.math.shapes.VoxelShape;
 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 @@
 /**
  * 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();
 
@@ -48,45 +46,35 @@ public void render( @Nonnull TileCable te, double x, double y, double z, float p
 
         BlockPos pos = te.getPos();
 
-        Minecraft mc = Minecraft.getInstance();
+        MinecraftClient mc = MinecraftClient.getInstance();
 
-        RayTraceResult hit = mc.objectMouseOver;
+        HitResult hit = mc.hitResult;
-        if( hit == null || !hit.getBlockPos().equals( pos ) ) return;
+        if( !(hit instanceof BlockHitResult) || !((BlockHitResult) hit).getBlockPos().equals( pos ) ) return;
-
-        if( MinecraftForgeClient.getRenderPass() != 0 ) return;
 
         World world = te.getWorld();
-        IBlockState state = world.getBlockState( pos );
+        BlockState state = te.getCachedState();
         Block block = state.getBlock();
         if( block != ComputerCraft.Blocks.cable ) return;
 
         VoxelShape shape = CableShapes.getModemShape( state );
-        state = te.hasModem() && shape.getBoundingBox().grow( 0.02, 0.02, 0.02 ).contains( hit.hitVec.subtract( pos.getX(), pos.getY(), pos.getZ() ) )
+        state = te.hasModem() && shape.getBoundingBox().expand( 0.02, 0.02, 0.02 ).contains( 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();
+        BufferBuilder buffer = Tessellator.getInstance().getBufferBuilder();
-        buffer.begin( GL11.GL_QUADS, DefaultVertexFormats.BLOCK );
+        buffer.begin( GL11.GL_QUADS, VertexFormats.POSITION_COLOR_UV_LMAP );
-        buffer.setTranslation( x - pos.getX(), y - pos.getY(), z - pos.getZ() );
+        buffer.setOffset( x - pos.getX(), y - pos.getY(), z - pos.getZ() );
-        buffer.noColor();
+        buffer.disableColor();
-
-        ForgeHooksClient.setRenderLayer( block.getRenderLayer() );
 
         // See BlockRendererDispatcher#renderBlockDamage
-        TextureAtlasSprite breakingTexture = mc.getTextureMap().getSprite( DESTROY_STAGES[destroyStage] );
+        Sprite breakingTexture = mc.getSpriteAtlas().getSprite( DESTROY_STAGE_TEXTURES[destroyStage] );
-        mc.getBlockRendererDispatcher().getBlockModelRenderer().renderModel(
+        mc.getBlockRenderManager().tesselateDamage( state, pos, breakingTexture, world );
-            world,
-            ForgeHooksClient.getDamageModel( model, breakingTexture, state, world, pos ),
-            state, pos, buffer, true, random, state.getPositionRandom( pos )
-        );
 
-        ForgeHooksClient.setRenderLayer( BlockRenderLayer.SOLID );
+        buffer.setOffset( 0, 0, 0 );
-
-        buffer.setTranslation( 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.util.Colour;
 import dan200.computercraft.shared.util.DirectionUtil;
 import dan200.computercraft.shared.util.Palette;
-import net.minecraft.client.Minecraft;
+import net.minecraft.client.MinecraftClient;
-import net.minecraft.client.renderer.BufferBuilder;
+import net.minecraft.client.render.BufferBuilder;
-import net.minecraft.client.renderer.GlStateManager;
+import net.minecraft.client.render.Tessellator;
-import net.minecraft.client.renderer.OpenGlHelper;
+import net.minecraft.client.render.VertexFormats;
-import net.minecraft.client.renderer.Tessellator;
+import net.minecraft.client.render.block.entity.BlockEntityRenderer;
-import net.minecraft.client.renderer.tileentity.TileEntityRenderer;
-import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
-import net.minecraft.util.EnumFacing;
 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 @@ private static void renderMonitorAt( TileMonitor monitor, double posX, double po
         posZ += originPos.getZ() - monitorPos.getZ();
 
         // Determine orientation
-        EnumFacing dir = origin.getDirection();
+        Direction dir = origin.getDirection();
-        EnumFacing front = origin.getFront();
+        Direction front = origin.getFront();
-        float yaw = dir.getHorizontalAngle();
+        float yaw = dir.asRotation();
         float pitch = DirectionUtil.toPitchAngle( front );
 
         GlStateManager.pushMatrix();
@@ -85,16 +85,16 @@ private static void renderMonitorAt( TileMonitor monitor, double posX, double po
             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 @@ private static void renderMonitorAt( TileMonitor monitor, double posX, double po
                             }
                         }
                         GlStateManager.callList( originTerminal.renderDisplayLists[0] );
-                        GlStateManager.resetColor();
+                        GlStateManager.clearCurrentColor();
 
                         // Draw text
                         fontRenderer.bindFont();
@@ -199,7 +199,7 @@ private static void renderMonitorAt( TileMonitor monitor, double posX, double po
                             }
                         }
                         GlStateManager.callList( originTerminal.renderDisplayLists[1] );
-                        GlStateManager.resetColor();
+                        GlStateManager.clearCurrentColor();
 
                         // Draw cursor
                         fontRenderer.bindFont();
@@ -233,7 +233,7 @@ private static void renderMonitorAt( TileMonitor monitor, double posX, double po
                         if( FrameInfo.getGlobalCursorBlink() )
                         {
                             GlStateManager.callList( originTerminal.renderDisplayLists[2] );
-                            GlStateManager.resetColor();
+                            GlStateManager.clearCurrentColor();
                         }
                     }
                     finally
@@ -251,11 +251,11 @@ private static void renderMonitorAt( TileMonitor monitor, double posX, double po
                     final float g = colour.getG();
                     final float b = colour.getB();
 
-                    renderer.begin( GL11.GL_TRIANGLE_STRIP, DefaultVertexFormats.POSITION_TEX_COLOR );
+                    renderer.begin( GL11.GL_TRIANGLE_STRIP, VertexFormats.POSITION_UV_COLOR );
-                    renderer.pos( -TileMonitor.RENDER_MARGIN, TileMonitor.RENDER_MARGIN, 0.0D ).tex( 0.0, 0.0 ).color( r, g, b, 1.0f ).endVertex();
+                    renderer.vertex( -TileMonitor.RENDER_MARGIN, TileMonitor.RENDER_MARGIN, 0.0D ).texture( 0.0, 0.0 ).color( r, g, b, 1.0f ).next();
-                    renderer.pos( -TileMonitor.RENDER_MARGIN, -ySize - TileMonitor.RENDER_MARGIN, 0.0 ).tex( 0.0, 1.0 ).color( r, g, b, 1.0f ).endVertex();
+                    renderer.vertex( -TileMonitor.RENDER_MARGIN, -ySize - TileMonitor.RENDER_MARGIN, 0.0 ).texture( 0.0, 1.0 ).color( r, g, b, 1.0f ).next();
-                    renderer.pos( xSize + TileMonitor.RENDER_MARGIN, TileMonitor.RENDER_MARGIN, 0.0D ).tex( 1.0, 0.0 ).color( r, g, b, 1.0f ).endVertex();
+                    renderer.vertex( xSize + TileMonitor.RENDER_MARGIN, TileMonitor.RENDER_MARGIN, 0.0D ).texture( 1.0, 0.0 ).color( r, g, b, 1.0f ).next();
-                    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.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 @@ private static void renderMonitorAt( TileMonitor monitor, double posX, double po
             try
             {
                 mc.getTextureManager().bindTexture( FixedWidthFontRenderer.BACKGROUND );
-                renderer.begin( GL11.GL_TRIANGLE_STRIP, DefaultVertexFormats.POSITION );
+                renderer.begin( GL11.GL_TRIANGLE_STRIP, VertexFormats.POSITION );
-                renderer.pos( -TileMonitor.RENDER_MARGIN, TileMonitor.RENDER_MARGIN, 0.0 ).endVertex();
+                renderer.vertex( -TileMonitor.RENDER_MARGIN, TileMonitor.RENDER_MARGIN, 0.0 ).next();
-                renderer.pos( -TileMonitor.RENDER_MARGIN, -ySize - TileMonitor.RENDER_MARGIN, 0.0 ).endVertex();
+                renderer.vertex( -TileMonitor.RENDER_MARGIN, -ySize - TileMonitor.RENDER_MARGIN, 0.0 ).next();
-                renderer.pos( xSize + TileMonitor.RENDER_MARGIN, TileMonitor.RENDER_MARGIN, 0.0 ).endVertex();
+                renderer.vertex( xSize + TileMonitor.RENDER_MARGIN, TileMonitor.RENDER_MARGIN, 0.0 ).next();
-                renderer.pos( xSize + TileMonitor.RENDER_MARGIN, -ySize - TileMonitor.RENDER_MARGIN, 0.0 ).endVertex();
+                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.util.DirectionUtil;
 import dan200.computercraft.shared.util.Holiday;
 import dan200.computercraft.shared.util.HolidayUtil;
-import net.minecraft.block.state.IBlockState;
+import net.minecraft.block.BlockState;
-import net.minecraft.client.Minecraft;
+import net.minecraft.client.MinecraftClient;
-import net.minecraft.client.renderer.BufferBuilder;
+import net.minecraft.client.render.*;
-import net.minecraft.client.renderer.GameRenderer;
+import net.minecraft.client.render.block.entity.BlockEntityRenderer;
-import net.minecraft.client.renderer.GlStateManager;
+import net.minecraft.client.render.model.BakedModel;
-import net.minecraft.client.renderer.Tessellator;
+import net.minecraft.client.render.model.BakedModelManager;
-import net.minecraft.client.renderer.model.BakedQuad;
+import net.minecraft.client.render.model.BakedQuad;
-import net.minecraft.client.renderer.model.IBakedModel;
+import net.minecraft.client.texture.SpriteAtlasTexture;
-import net.minecraft.client.renderer.model.ModelManager;
+import net.minecraft.client.util.ModelIdentifier;
-import net.minecraft.client.renderer.model.ModelResourceLocation;
+import net.minecraft.util.Identifier;
-import net.minecraft.client.renderer.texture.TextureMap;
+import net.minecraft.util.hit.BlockHitResult;
-import net.minecraft.client.renderer.tileentity.TileEntityRenderer;
+import net.minecraft.util.math.Direction;
-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.util.math.Vec3d;
-import net.minecraftforge.client.ForgeHooksClient;
+import net.minecraft.util.math.Vec3i;
-import net.minecraftforge.client.model.pipeline.LightUtil;
 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 ModelIdentifier NORMAL_TURTLE_MODEL = new ModelIdentifier( "computercraft:turtle_normal", "inventory" );
-    private static final ModelResourceLocation ADVANCED_TURTLE_MODEL = new ModelResourceLocation( "computercraft:turtle_advanced", "inventory" );
+    private static final ModelIdentifier ADVANCED_TURTLE_MODEL = new ModelIdentifier( "computercraft:turtle_advanced", "inventory" );
-    private static final ModelResourceLocation COLOUR_TURTLE_MODEL = new ModelResourceLocation( "computercraft:turtle_colour", "inventory" );
+    private static final ModelIdentifier COLOUR_TURTLE_MODEL = new ModelIdentifier( "computercraft:turtle_colour", "inventory" );
-    private static final ModelResourceLocation ELF_OVERLAY_MODEL = new ModelResourceLocation( "computercraft:turtle_elf_overlay", "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 void render( TileTurtle tileEntity, double posX, double posY, double posZ
         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 static ModelResourceLocation getTurtleModel( ComputerFamily family, boole
         }
     }
 
-    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 @@ private void renderTurtleAt( TileTurtle turtle, double posX, double posY, double
     {
         // 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 );
+            method_3570( true );
-            GameRenderer.drawNameplate(
+            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 );
+            method_3570( 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 @@ private void renderTurtleAt( TileTurtle turtle, double posX, double posY, double
             {
                 // 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 @@ private void renderTurtleAt( TileTurtle turtle, double posX, double posY, double
         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 @@ private void renderUpgrade( IBlockState state, TileTurtle turtle, TurtleSide sid
                 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 @@ private void renderUpgrade( IBlockState state, TileTurtle turtle, TurtleSide sid
         }
     }
 
-    private void renderModel( IBlockState state, ModelResourceLocation modelLocation, int[] tints )
+    private void renderModel( BlockState state, ModelIdentifier modelLocation, int[] tints )
     {
-        Minecraft mc = Minecraft.getInstance();
+        MinecraftClient mc = MinecraftClient.getInstance();
-        ModelManager modelManager = mc.getItemRenderer().getItemModelMesher().getModelManager();
+        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 @@ private void renderModel( IBlockState state, IBakedModel model, int[] tints )
 
     private static void renderQuads( Tessellator tessellator, List<BakedQuad> quads, int[] tints )
     {
-        BufferBuilder buffer = tessellator.getBuffer();
+        BufferBuilder buffer = tessellator.getBufferBuilder();
-        VertexFormat format = DefaultVertexFormats.ITEM;
+        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.render.model.BakedModel;
-import net.minecraft.client.renderer.model.IUnbakedModel;
+import net.minecraft.client.render.model.ModelLoader;
-import net.minecraft.client.renderer.texture.TextureAtlasSprite;
+import net.minecraft.client.render.model.ModelRotationContainer;
-import net.minecraft.client.renderer.vertex.VertexFormat;
+import net.minecraft.client.render.model.UnbakedModel;
-import net.minecraft.resources.IResourceManager;
+import net.minecraft.client.texture.Sprite;
-import net.minecraft.util.ResourceLocation;
+import net.minecraft.util.Identifier;
-import net.minecraftforge.client.model.ICustomModelLoader;
-import net.minecraftforge.common.model.IModelState;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -24,11 +22,11 @@
 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 Identifier NORMAL_TURTLE_MODEL = new Identifier( ComputerCraft.MOD_ID, "block/turtle_normal" );
-    private static final ResourceLocation ADVANCED_TURTLE_MODEL = new ResourceLocation( ComputerCraft.MOD_ID, "block/turtle_advanced" );
+    private static final Identifier ADVANCED_TURTLE_MODEL = new Identifier( 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 COLOUR_TURTLE_MODEL = new Identifier( ComputerCraft.MOD_ID, "block/turtle_colour" );
 
     public static final TurtleModelLoader INSTANCE = new TurtleModelLoader();
 
@@ -36,21 +34,14 @@ private TurtleModelLoader()
     {
     }
 
-    @Override
+    public boolean accepts( @Nonnull Identifier name )
-    public void onResourceManagerReload( @Nonnull IResourceManager manager )
-    {
-    }
-
-    @Override
-    public boolean accepts( @Nonnull ResourceLocation name )
     {
         return name.getNamespace().equals( ComputerCraft.MOD_ID )
             && (name.getPath().equals( "item/turtle_normal" ) || name.getPath().equals( "item/turtle_advanced" ));
     }
 
     @Nonnull
-    @Override
+    public UnbakedModel loadModel( @Nonnull Identifier name )
-    public IUnbakedModel loadModel( @Nonnull ResourceLocation name )
     {
         if( name.getNamespace().equals( ComputerCraft.MOD_ID ) )
         {
@@ -66,35 +57,35 @@ public IUnbakedModel loadModel( @Nonnull ResourceLocation name )
         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()
+            return getModelDependencies().stream()
-                .flatMap( x -> modelGetter.apply( x ).getTextures( modelGetter, missingTextureErrors ).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 ModelRotationContainer state )
         {
             return new TurtleSmartItemModel(
-                modelGetter.apply( family ).bake( modelGetter, spriteGetter, state, uvlock, format ),
+                loader.getOrLoadModel( family ).bake( loader, spriteGetter, state ),
-                modelGetter.apply( COLOUR_TURTLE_MODEL ).bake( modelGetter, spriteGetter, state, uvlock, format )
+                loader.getOrLoadModel( COLOUR_TURTLE_MODEL ).bake( loader, spriteGetter, state )
             );
         }
     }

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

@@ -6,31 +6,31 @@
 
 package dan200.computercraft.client.render;
 
-import net.minecraft.block.state.IBlockState;
+import net.minecraft.block.BlockState;
-import net.minecraft.client.renderer.model.BakedQuad;
+import net.minecraft.client.render.model.BakedModel;
-import net.minecraft.client.renderer.model.IBakedModel;
+import net.minecraft.client.render.model.BakedQuad;
-import net.minecraft.client.renderer.model.ItemCameraTransforms;
+import net.minecraft.client.render.model.json.ModelItemPropertyOverrideList;
-import net.minecraft.client.renderer.model.ItemOverrideList;
+import net.minecraft.client.render.model.json.ModelTransformation;
-import net.minecraft.client.renderer.texture.TextureAtlasSprite;
+import net.minecraft.client.texture.Sprite;
-import net.minecraft.util.EnumFacing;
+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 BakedModel m_baseModel;
-    private final IBakedModel m_overlayModel;
+    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;
@@ -44,7 +44,7 @@ public TurtleMultiModel( IBakedModel baseModel, IBakedModel overlayModel, Matrix
 
     @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 )
         {
@@ -58,7 +58,7 @@ public List<BakedQuad> getQuads( IBlockState state, EnumFacing side, @Nonnull Ra
         }
     }
 
-    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 );
@@ -95,42 +95,38 @@ private List<BakedQuad> buildQuads( IBlockState state, EnumFacing side, Random r
     }
 
     @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 ModelTransformation getTransformation()
-    public ItemCameraTransforms getItemCameraTransforms()
     {
-        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.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.block.BlockState;
-import net.minecraft.client.Minecraft;
+import net.minecraft.client.MinecraftClient;
-import net.minecraft.client.renderer.model.*;
+import net.minecraft.client.render.model.BakedModel;
-import net.minecraft.client.renderer.texture.TextureAtlasSprite;
+import net.minecraft.client.render.model.BakedModelManager;
-import net.minecraft.entity.EntityLivingBase;
+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.Identifier;
-import net.minecraft.util.ResourceLocation;
+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 @@ private static class TurtleModelCombination
         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 int hashCode()
         }
     }
 
-    private final IBakedModel familyModel;
+    private final BakedModel familyModel;
-    private final IBakedModel colourModel;
+    private final BakedModel colourModel;
 
-    private HashMap<TurtleModelCombination, IBakedModel> m_cachedModels;
+    private HashMap<TurtleModelCombination, BakedModel> m_cachedModels;
-    private ItemOverrideList m_overrides;
+    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 IBakedModel getModelWithOverrides( @Nonnull IBakedModel originalModel, @N
 
     @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();
+        MinecraftClient mc = MinecraftClient.getInstance();
-        ModelManager modelManager = mc.getItemRenderer().getItemModelMesher().getModelManager();
+        BakedModelManager modelManager = mc.getItemRenderer().getModels().getModelManager();
-        ModelResourceLocation overlayModelLocation = TileEntityTurtleRenderer.getTurtleOverlayModel( combo.m_overlay, combo.m_christmas );
+        ModelIdentifier overlayModelLocation = TileEntityTurtleRenderer.getTurtleOverlayModel( combo.m_overlay, combo.m_christmas );
 
-        IBakedModel baseModel = combo.m_colour ? colourModel : familyModel;
+        BakedModel baseModel = combo.m_colour ? colourModel : familyModel;
-        IBakedModel overlayModel = overlayModelLocation != null ? modelManager.getModel( overlayModelLocation ) : null;
+        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<BakedModel, 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> 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 @@ else if( rightModel != null )
 
     @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 ModelTransformation getTransformation()
-    public ItemCameraTransforms getItemCameraTransforms()
     {
-        return familyModel.getItemCameraTransforms();
+        return familyModel.getTransformation();
     }
-
 }

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

@@ -10,7 +10,7 @@
 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 @@
  * 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

@@ -11,13 +11,9 @@
 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.resource.*;
-import net.minecraft.resources.IResource;
+import net.minecraft.util.Identifier;
-import net.minecraft.resources.IResourceManager;
+import net.minecraft.util.profiler.Profiler;
-import net.minecraft.resources.IResourceManagerReloadListener;
-import net.minecraft.util.ResourceLocation;
-import net.minecraftforge.resource.IResourceType;
-import net.minecraftforge.resource.ISelectiveResourceReloadListener;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -28,7 +24,6 @@
 import java.nio.channels.ReadableByteChannel;
 import java.util.*;
 import java.util.concurrent.TimeUnit;
-import java.util.function.Predicate;
 
 public class ResourceMount implements IMount
 {
@@ -58,12 +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;
@@ -76,8 +71,8 @@ public ResourceMount( String namespace, String subPath, IReloadableResourceManag
     private void load()
     {
         boolean hasAny = false;
-        FileEntry newRoot = new FileEntry( new ResourceLocation( namespace, subPath ) );
+        FileEntry newRoot = new FileEntry( new Identifier( namespace, subPath ) );
-        for( ResourceLocation file : manager.getAllResourceLocations( subPath, s -> true ) )
+        for( Identifier file : manager.findResources( subPath, s -> true ) )
         {
             if( !file.getNamespace().equals( namespace ) ) continue;
 
@@ -120,7 +115,7 @@ private void create( FileEntry lastEntry, String path )
             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;
@@ -164,7 +159,7 @@ public long getSize( @Nonnull String path ) throws IOException
 
             try
             {
-                IResource resource = manager.getResource( file.identifier );
+                Resource resource = manager.getResource( file.identifier );
                 InputStream s = resource.getInputStream();
                 int total = 0, read = 0;
                 do
@@ -220,11 +215,11 @@ public ReadableByteChannel openChannelForRead( @Nonnull String path ) throws IOE
 
     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;
         }
@@ -241,34 +236,41 @@ void list( List<String> contents )
     }
 
     /**
-     * A {@link IResourceManagerReloadListener} 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.
+            profiler.push( "Mount reloading" );
-            onResourceManagerReload( manager, x -> true );
+            try
-        }
-
-        @Override
-        public synchronized void onResourceManagerReload( @Nonnull IResourceManager manager, @Nonnull Predicate<IResourceType> predicate )
             {
                 for( ResourceMount mount : mounts ) mount.load();
             }
-
+            finally
-        synchronized void add( IReloadableResourceManager manager, ResourceMount mount )
             {
-            if( managers.add( manager ) ) manager.addReloadListener( this );
+                profiler.pop();
+            }
+            return null;
+        }
+
+        @Override
+        protected void apply( Void res, ResourceManager manager, Profiler profiler )
+        {
+        }
+
+        synchronized void add( ReloadableResourceManager manager, ResourceMount mount )
+        {
+            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 final void clearChanged()
         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 synchronized NBTTagCompound writeToNBT( NBTTagCompound nbt )
         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 synchronized void readFromNBT( NBTTagCompound nbt )
         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

@@ -10,8 +10,8 @@
 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 )
     {
         Preconditions.checkNotNull( 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 @@ private static int getUnmaskedOutput( World world, BlockPos pos, EnumFacing side
         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<Long> maxMainGlobalTime;
-    private static ConfigValue<Long> 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<Long> httpMaxDownload;
-    private static ConfigValue<Long> 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", TimeUnit.NANOSECONDS.toMillis( ComputerCraft.maxMainGlobalTime ), 1, Long.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", TimeUnit.NANOSECONDS.toMillis( ComputerCraft.maxMainComputerTime ), 1, Long.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", ComputerCraft.httpMaxDownload, 0, Long.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", ComputerCraft.httpMaxUpload, 0, Long.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 @@
 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 static synchronized void register( @Nonnull IPeripheralProvider provider
         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.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 static synchronized void register( @Nonnull IPocketUpgrade upgrade )
         }
 
         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 static IPocketUpgrade get( @Nonnull ItemStack stack )
         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 @@
 
 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.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.block.Material;
-import net.minecraft.entity.EntityType;
+import net.minecraft.block.entity.BlockEntityType;
-import net.minecraft.init.Items;
 import net.minecraft.item.Item;
-import net.minecraft.item.ItemBlock;
 import net.minecraft.item.ItemGroup;
-import net.minecraft.tileentity.TileEntityType;
+import net.minecraft.item.ItemStack;
-import net.minecraft.util.ResourceLocation;
+import net.minecraft.item.Items;
-import net.minecraftforge.event.RegistryEvent;
+import net.minecraft.item.block.BlockItem;
-import net.minecraftforge.eventbus.api.SubscribeEvent;
+import net.minecraft.recipe.RecipeSerializer;
-import net.minecraftforge.fml.common.Mod;
+import net.minecraft.util.Identifier;
-import net.minecraftforge.registries.IForgeRegistry;
+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( MutableRegistry<Block> registry )
-    public static void registerBlocks( RegistryEvent.Register<Block> event )
     {
-        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(
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "computer_normal" ), ComputerCraft.Blocks.computerNormal );
-            ComputerCraft.Blocks.computerNormal.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "computer_normal" ) ),
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "computer_advanced" ), ComputerCraft.Blocks.computerAdvanced );
-            ComputerCraft.Blocks.computerAdvanced.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "computer_advanced" ) ),
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "computer_command" ), ComputerCraft.Blocks.computerCommand );
-            ComputerCraft.Blocks.computerCommand.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "computer_command" ) )
-        );
 
         // 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(
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "turtle_normal" ), ComputerCraft.Blocks.turtleNormal );
-            ComputerCraft.Blocks.turtleNormal.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "turtle_normal" ) ),
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "turtle_advanced" ), ComputerCraft.Blocks.turtleAdvanced );
-            ComputerCraft.Blocks.turtleAdvanced.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "turtle_advanced" ) )
-        );
 
         // 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(
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "speaker" ), ComputerCraft.Blocks.speaker );
-            ComputerCraft.Blocks.speaker.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "speaker" ) ),
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "disk_drive" ), ComputerCraft.Blocks.diskDrive );
-            ComputerCraft.Blocks.diskDrive.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "disk_drive" ) ),
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "monitor_normal" ), ComputerCraft.Blocks.monitorNormal );
-            ComputerCraft.Blocks.monitorNormal.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "monitor_normal" ) ),
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "monitor_advanced" ), ComputerCraft.Blocks.monitorAdvanced );
-            ComputerCraft.Blocks.monitorAdvanced.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "monitor_advanced" ) ),
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "printer" ), ComputerCraft.Blocks.printer );
-            ComputerCraft.Blocks.printer.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "printer" ) ),
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "wireless_modem_normal" ), ComputerCraft.Blocks.wirelessModemNormal );
-            ComputerCraft.Blocks.wirelessModemNormal.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "wireless_modem_normal" ) ),
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "wireless_modem_advanced" ), ComputerCraft.Blocks.wirelessModemAdvanced );
-            ComputerCraft.Blocks.wirelessModemAdvanced.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "wireless_modem_advanced" ) ),
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "wired_modem_full" ), ComputerCraft.Blocks.wiredModemFull );
-            ComputerCraft.Blocks.wiredModemFull.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "wired_modem_full" ) ),
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "cable" ), ComputerCraft.Blocks.cable );
-            ComputerCraft.Blocks.cable.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "cable" ) )
-        );
     }
 
-    @SubscribeEvent
+    public static void registerTileEntities( MutableRegistry<BlockEntityType<?>> registry )
-    public static void registerTileEntities( RegistryEvent.Register<TileEntityType<?>> event )
     {
-        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(
+        registry.add( TileSpeaker.FACTORY.getId(), TileSpeaker.FACTORY );
-            TileSpeaker.FACTORY,
+        registry.add( TileDiskDrive.FACTORY.getId(), TileDiskDrive.FACTORY );
-            TileDiskDrive.FACTORY,
+        registry.add( TilePrinter.FACTORY.getId(), TilePrinter.FACTORY );
-            TileMonitor.FACTORY_NORMAL,
+
-            TileMonitor.FACTORY_ADVANCED,
+        registry.add( TileMonitor.FACTORY_NORMAL.getId(), TileMonitor.FACTORY_NORMAL );
-            TilePrinter.FACTORY,
+        registry.add( TileMonitor.FACTORY_ADVANCED.getId(), TileMonitor.FACTORY_ADVANCED );
-            TileWirelessModem.FACTORY_NORMAL,
+
-            TileWirelessModem.FACTORY_ADVANCED,
+        registry.add( TileWirelessModem.FACTORY_NORMAL.getId(), TileWirelessModem.FACTORY_NORMAL );
-            TileWiredModemFull.FACTORY,
+        registry.add( TileWirelessModem.FACTORY_ADVANCED.getId(), TileWirelessModem.FACTORY_ADVANCED );
-            TileCable.FACTORY
+        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() );
+        registry.add( net.minecraft.util.registry.Registry.BLOCK.getId( item.getBlock() ), item );
-        return 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( MutableRegistry<Item> registry )
-    public static void registerItems( RegistryEvent.Register<Item> event )
     {
-        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(
+        registerItemBlock( registry, ComputerCraft.Items.computerNormal );
-            setupItemBlock( ComputerCraft.Items.computerNormal ),
+        registerItemBlock( registry, ComputerCraft.Items.computerAdvanced );
-            setupItemBlock( ComputerCraft.Items.computerAdvanced ),
+        registerItemBlock( registry, ComputerCraft.Items.computerCommand );
-            setupItemBlock( 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 ),
+        registerItemBlock( registry, ComputerCraft.Items.turtleNormal );
-            setupItemBlock( ComputerCraft.Items.turtleAdvanced )
+        registerItemBlock( registry, ComputerCraft.Items.turtleAdvanced );
-        );
 
         // Pocket computer
-        ComputerCraft.Items.pocketComputerNormal = new ItemPocketComputer( defaultItem().maxStackSize( 1 ), ComputerFamily.Normal );
+        ComputerCraft.Items.pocketComputerNormal = new ItemPocketComputer( defaultItem().stackSize( 1 ), ComputerFamily.Normal );
-        ComputerCraft.Items.pocketComputerAdvanced = new ItemPocketComputer( defaultItem().maxStackSize( 1 ), ComputerFamily.Advanced );
+        ComputerCraft.Items.pocketComputerAdvanced = new ItemPocketComputer( defaultItem().stackSize( 1 ), ComputerFamily.Advanced );
 
-        registry.registerAll(
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "pocket_computer_normal" ), ComputerCraft.Items.pocketComputerNormal );
-            ComputerCraft.Items.pocketComputerNormal.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "pocket_computer_normal" ) ),
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "pocket_computer_advanced" ), ComputerCraft.Items.pocketComputerAdvanced );
-            ComputerCraft.Items.pocketComputerAdvanced.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "pocket_computer_advanced" ) )
-        );
 
         // Floppy disk
-        ComputerCraft.Items.disk = new ItemDisk( defaultItem().maxStackSize( 1 ) );
+        ComputerCraft.Items.disk = new ItemDisk( defaultItem().stackSize( 1 ) );
-        ComputerCraft.Items.treasureDisk = new ItemTreasureDisk( defaultItem().maxStackSize( 1 ) );
+        ComputerCraft.Items.treasureDisk = new ItemTreasureDisk( defaultItem().stackSize( 1 ) );
 
-        registry.registerAll(
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "disk" ), ComputerCraft.Items.disk );
-            ComputerCraft.Items.disk.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "disk" ) ),
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "treasure_disk" ), ComputerCraft.Items.treasureDisk );
-            ComputerCraft.Items.treasureDisk.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "treasure_disk" ) )
-        );
 
         // Printouts
-        ComputerCraft.Items.printedPage = new ItemPrintout( defaultItem().maxStackSize( 1 ), ItemPrintout.Type.PAGE );
+        ComputerCraft.Items.printedPage = new ItemPrintout( defaultItem().stackSize( 1 ), ItemPrintout.Type.PAGE );
-        ComputerCraft.Items.printedPages = new ItemPrintout( defaultItem().maxStackSize( 1 ), ItemPrintout.Type.PAGES );
+        ComputerCraft.Items.printedPages = new ItemPrintout( defaultItem().stackSize( 1 ), ItemPrintout.Type.PAGES );
-        ComputerCraft.Items.printedBook = new ItemPrintout( defaultItem().maxStackSize( 1 ), ItemPrintout.Type.BOOK );
+        ComputerCraft.Items.printedBook = new ItemPrintout( defaultItem().stackSize( 1 ), ItemPrintout.Type.BOOK );
 
-        registry.registerAll(
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "printed_page" ), ComputerCraft.Items.printedPage );
-            ComputerCraft.Items.printedPage.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "printed_page" ) ),
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "printed_pages" ), ComputerCraft.Items.printedPages );
-            ComputerCraft.Items.printedPages.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "printed_pages" ) ),
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "printed_book" ), ComputerCraft.Items.printedBook );
-            ComputerCraft.Items.printedBook.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "printed_book" ) )
-        );
 
         // Peripherals
-        registry.registerAll(
+        registerItemBlock( registry, new BlockItem( ComputerCraft.Blocks.speaker, defaultItem() ) );
-            setupItemBlock( new ItemBlock( ComputerCraft.Blocks.speaker, defaultItem() ) ),
+        registerItemBlock( registry, new BlockItem( ComputerCraft.Blocks.diskDrive, defaultItem() ) );
-            setupItemBlock( new ItemBlock( ComputerCraft.Blocks.diskDrive, defaultItem() ) ),
+        registerItemBlock( registry, new BlockItem( ComputerCraft.Blocks.printer, defaultItem() ) );
-            setupItemBlock( new ItemBlock( ComputerCraft.Blocks.printer, defaultItem() ) ),
+        registerItemBlock( registry, new BlockItem( ComputerCraft.Blocks.monitorNormal, defaultItem() ) );
-            setupItemBlock( new ItemBlock( ComputerCraft.Blocks.monitorNormal, defaultItem() ) ),
+        registerItemBlock( registry, new BlockItem( ComputerCraft.Blocks.monitorAdvanced, defaultItem() ) );
-            setupItemBlock( new ItemBlock( ComputerCraft.Blocks.monitorAdvanced, defaultItem() ) ),
+        registerItemBlock( registry, new BlockItem( ComputerCraft.Blocks.wirelessModemNormal, defaultItem() ) );
-            setupItemBlock( new ItemBlock( ComputerCraft.Blocks.wirelessModemNormal, defaultItem() ) ),
+        registerItemBlock( registry, new BlockItem( ComputerCraft.Blocks.wirelessModemAdvanced, defaultItem() ) );
-            setupItemBlock( new ItemBlock( ComputerCraft.Blocks.wirelessModemAdvanced, defaultItem() ) ),
+        registerItemBlock( registry, new BlockItem( ComputerCraft.Blocks.wiredModemFull, defaultItem() ) );
-            setupItemBlock( new ItemBlock( 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" ) ),
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "cable" ), ComputerCraft.Items.cable );
-            ComputerCraft.Items.wiredModem.setRegistryName( new ResourceLocation( ComputerCraft.MOD_ID, "wired_modem" ) )
+        registry.add( new Identifier( ComputerCraft.MOD_ID, "wired_modem" ), ComputerCraft.Items.wiredModem );
-        );
 
         registerTurtleUpgrades();
         registerPocketUpgrades();
@@ -271,31 +255,31 @@ public static void registerItems( RegistryEvent.Register<Item> event )
     private static void registerTurtleUpgrades()
     {
         // Upgrades
-        ComputerCraft.TurtleUpgrades.wirelessModemNormal = new TurtleModem( false, new ResourceLocation( ComputerCraft.MOD_ID, "wireless_modem_normal" ) );
+        ComputerCraft.TurtleUpgrades.wirelessModemNormal = new TurtleModem( false, new Identifier( ComputerCraft.MOD_ID, "wireless_modem_normal" ) );
-        TurtleUpgrades.register( ComputerCraft.TurtleUpgrades.wirelessModemNormal );
+        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 @@ private static void registerPocketUpgrades()
         ComputerCraftAPI.registerPocketUpgrade( ComputerCraft.PocketUpgrades.speaker = new PocketSpeaker() );
     }
 
-    @SubscribeEvent
+    public static void registerRecipes( MutableRegistry<RecipeSerializer<?>> registry )
-    public static void registerEntities( RegistryEvent.Register<EntityType<?>> 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
+    @Subscribe
-    public static void onTurtleAction( TurtleActionEvent event )
+    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.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 static void register( @Nonnull ITurtleUpgrade upgrade )
         }
 
         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 static Iterable<ITurtleUpgrade> getVanillaUpgrades()
         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.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.PlayerEntity;
-import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.server.command.ServerCommandSource;
-import net.minecraft.network.play.server.SPacketPlayerPosLook;
+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.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.ServerCommandManager.literal;
 
 public final class CommandComputerCraft
 {
@@ -59,7 +58,7 @@ private 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 static void register( CommandDispatcher<CommandSource> dispatcher )
                 .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 @@ else if( b.getWorld() == world )
 
                     if( world == null || pos == null ) throw TP_NOT_THERE.create();
 
-                    Entity entity = context.getSource().assertIsEntity();
+                    Entity entity = context.getSource().getEntityOrThrow();
-                    if( !(entity instanceof EntityPlayerMP) ) throw TP_NOT_PLAYER.create();
+                    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.method_14251( (ServerWorld) world, pos.getX() + 0.5, pos.getY(), pos.getZ() + 0.5, 0, 0 );
                     }
 
                     return 1;
@@ -210,7 +209,7 @@ else if( b.getWorld() == world )
                 .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 @@ else if( b.getWorld() == world )
         );
     }
 
-    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 @@ private static ITextComponent linkComputer( CommandSource source, ServerComputer
         }
 
         // 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( " " )
+                .append( " " )
-                .appendSibling( link(
+                .append( link(
                     text( "\u261b" ),
                     "/computercraft tp " + serverComputer.getInstanceID(),
                     translate( "commands.computercraft.tp.action" )
                 ) )
-                .appendText( " " )
+                .append( " " )
-                .appendSibling( link(
+                .append( link(
                     text( "\u20e2" ),
                     "/computercraft view " + serverComputer.getInstanceID(),
                     translate( "commands.computercraft.view.action" )
@@ -299,7 +298,7 @@ private static ITextComponent linkComputer( CommandSource source, ServerComputer
         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 @@ private static ITextComponent linkPosition( CommandSource context, ServerCompute
     }
 
     @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 @@ private static int displayTimings( CommandSource source, @Nonnull List<ComputerT
 
         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 @@ private static int displayTimings( CommandSource source, @Nonnull List<ComputerT
             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 @@
 
 import com.mojang.brigadier.CommandDispatcher;
 import com.mojang.brigadier.arguments.StringArgumentType;
-import dan200.computercraft.ComputerCraft;
+import net.minecraft.client.MinecraftClient;
-import net.minecraft.client.Minecraft;
+import net.minecraft.server.command.ServerCommandSource;
-import net.minecraft.command.CommandSource;
+import net.minecraft.text.StringTextComponent;
-import net.minecraft.util.text.ITextComponent;
+import net.minecraft.text.TextComponent;
-import net.minecraft.util.text.TextComponentString;
+import net.minecraft.text.TranslatableTextComponent;
-import net.minecraft.util.text.TextComponentTranslation;
+import net.minecraft.text.event.ClickEvent;
-import net.minecraft.util.text.event.ClickEvent;
+import net.minecraft.text.event.HoverEvent;
-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 static net.minecraft.command.Commands.argument;
+import static net.minecraft.server.command.ServerCommandManager.argument;
-import static net.minecraft.command.Commands.literal;
+import static net.minecraft.server.command.ServerCommandManager.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 @@ private 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 boolean onClientSendMessage( String message )
-    public static void onClientSendMessage( ClientChatEvent event )
     {
         // 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() ) );
+            MinecraftClient.getInstance().keyboard.setClipboard( message.substring( PREFIX.length() ) );
-            event.setCanceled( true );
+            return true;
-        }
         }
 
-    public static ITextComponent createCopyText( String text )
+        return false;
+    }
+
+    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 @@
 import com.mojang.brigadier.context.CommandContext;
 import com.mojang.brigadier.suggestion.Suggestions;
 import com.mojang.brigadier.suggestion.SuggestionsBuilder;
-import net.minecraft.command.CommandSource;
+import dan200.computercraft.api.turtle.event.FakePlayer;
-import net.minecraft.command.ISuggestionProvider;
 import net.minecraft.entity.Entity;
-import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.server.command.CommandSource;
-import net.minecraftforge.common.util.FakePlayer;
+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 @@
 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 int toLevel()
     }
 
     @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 &&
+        if( server.isSinglePlayer() && sender instanceof PlayerEntity &&
-            ((EntityPlayer) sender).getGameProfile().getName().equalsIgnoreCase( server.getServerModName() ) )
+            ((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 @@
 
 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.command.arguments.serialize.ArgumentSerializer;
-import net.minecraft.util.ResourceLocation;
+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 Identifier( ComputerCraft.MOD_ID, "tracking_field" ), TrackingFieldArgumentType.trackingField() );
-        register( new ResourceLocation( ComputerCraft.MOD_ID, "computer" ), ComputerArgumentType.oneComputer() );
+        register( new Identifier( ComputerCraft.MOD_ID, "computer" ), ComputerArgumentType.oneComputer() );
-        register( new ResourceLocation( ComputerCraft.MOD_ID, "computers" ), ComputersArgumentType.class, new ComputersArgumentType.Serializer() );
+        register( new Identifier( ComputerCraft.MOD_ID, "computers" ), ComputersArgumentType.class, new ComputersArgumentType.Serializer() );
-        registerUnsafe( new ResourceLocation( ComputerCraft.MOD_ID, "repeat" ), RepeatArgumentType.class, new RepeatArgumentType.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.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 static ComputerArgumentType oneComputer()
         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 Collection<String> getExamples()
     @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 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.serialize.ArgumentSerializer;
-import net.minecraft.command.arguments.IArgumentSerializer;
+import net.minecraft.server.command.ServerCommandSource;
-import net.minecraft.network.PacketBuffer;
+import net.minecraft.util.PacketByteBuf;
 
 import javax.annotation.Nonnull;
 import java.util.*;
@@ -50,7 +50,7 @@ public static ComputersArgumentType someComputers()
         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 @@ private static ComputersSupplier getComputers( Predicate<ServerComputer> predica
         );
     }
 
-    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 void write( @Nonnull ComputersArgumentType arg, @Nonnull JsonObject json
     @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.suggestion.Suggestions;
 import com.mojang.brigadier.suggestion.SuggestionsBuilder;
 import net.minecraft.command.arguments.ArgumentTypes;
-import net.minecraft.command.arguments.IArgumentSerializer;
+import net.minecraft.command.arguments.serialize.ArgumentSerializer;
-import net.minecraft.network.PacketBuffer;
+import net.minecraft.text.StringTextComponent;
-import net.minecraft.util.text.ITextComponent;
+import net.minecraft.text.TextComponent;
-import net.minecraft.util.text.TextComponentString;
+import net.minecraft.util.PacketByteBuf;
 
 import javax.annotation.Nonnull;
 import java.util.ArrayList;
@@ -126,41 +126,41 @@ public Collection<String> getExamples()
         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 );
+            ArgumentType<?> child = ArgumentTypes.fromPacket( buf );
-            ITextComponent message = buf.readTextComponent();
+            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;
+            if( message instanceof TextComponent ) return (TextComponent) message;
-            return new TextComponentString( message.getString() );
+            return new StringTextComponent( message.getString() );
         }
     }
 }

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

@@ -13,7 +13,7 @@
 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.context.CommandContext;
 import com.mojang.brigadier.tree.CommandNode;
 import com.mojang.brigadier.tree.LiteralCommandNode;
-import net.minecraft.command.CommandSource;
+import net.minecraft.server.command.ServerCommandSource;
-import net.minecraft.util.text.ITextComponent;
+import net.minecraft.text.StringTextComponent;
-import net.minecraft.util.text.TextComponentString;
+import net.minecraft.text.TextComponent;
-import net.minecraft.util.text.TextFormatting;
+import net.minecraft.text.TextFormat;
-import net.minecraft.util.text.event.ClickEvent;
+import net.minecraft.text.event.ClickEvent;
 
 import javax.annotation.Nonnull;
 import java.util.ArrayList;
@@ -30,7 +30,7 @@
  * 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 static HelpingArgumentBuilder choice( String literal )
     }
 
     @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 @@ else if( argument instanceof LiteralArgumentBuilder )
     }
 
     @Override
-    public LiteralArgumentBuilder<CommandSource> then( CommandNode<CommandSource> argument )
+    public LiteralArgumentBuilder<ServerCommandSource> then( CommandNode<ServerCommandSource> argument )
     {
         if( !(argument instanceof LiteralCommandNode) )
         {
@@ -82,33 +82,33 @@ public LiteralArgumentBuilder<CommandSource> then( CommandNode<CommandSource> ar
     }
 
     @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 @@ private LiteralCommandNode<CommandSource> buildImpl( String id, String 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 @@ private LiteralCommandNode<CommandSource> buildImpl( String id, String command )
         return node;
     }
 
-    private static final TextFormatting HEADER = TextFormatting.LIGHT_PURPLE;
+    private static final TextFormat HEADER = TextFormat.LIGHT_PURPLE;
-    private static final TextFormatting SYNOPSIS = TextFormatting.AQUA;
+    private static final TextFormat SYNOPSIS = TextFormat.AQUA;
-    private static final TextFormatting NAME = TextFormatting.GREEN;
+    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 @@ private HelpCommand( String id, String 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 @@ private static Command<CommandSource> helpForChild( CommandNode<CommandSource> n
         };
     }
 
-    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();
+        CommandDispatcher<ServerCommandSource> dispatcher = context.getSource().getMinecraftServer().getCommandManager().getDispatcher();
-        CommandNode<CommandSource> temp = new LiteralCommandNode<>( "_", null, x -> true, null, null, false );
+        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( "" )
+        TextComponent output = new StringTextComponent( "" )
-            .appendSibling( coloured( "/" + command + usage, HEADER ) )
+            .append( coloured( "/" + command + usage, HEADER ) )
-            .appendText( " " )
+            .append( " " )
-            .appendSibling( coloured( translate( "commands." + id + ".synopsis" ), SYNOPSIS ) )
+            .append( coloured( translate( "commands." + id + ".synopsis" ), SYNOPSIS ) )
-            .appendText( "\n" )
+            .append( "\n" )
-            .appendSibling( translate( "commands." + id + ".desc" ) );
+            .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( "" );
+        TextComponent component = new StringTextComponent( "" );
-        for( ITextComponent child : children )
+        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.yes" ), TextFormat.GREEN )
-            : coloured( translate( "commands.computercraft.generic.no" ), TextFormatting.RED );
+            : 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.server.command.ServerCommandSource;
-import net.minecraft.util.text.ITextComponent;
+import net.minecraft.text.StringTextComponent;
-import net.minecraft.util.text.TextComponentString;
+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 @Nullable
-    public ITextComponent getPadding( ITextComponent component, int width )
+    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 int getColumnPadding()
     }
 
     @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 @@
 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.server.command.ServerCommandSource;
-import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.server.network.ServerPlayerEntity;
-import net.minecraft.util.text.ITextComponent;
+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 TextComponent[] headers;
-    private final ArrayList<ITextComponent[]> rows = new ArrayList<>();
+    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 TableBuilder( int id, @Nonnull String... headers )
     {
         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 int getColumns()
     }
 
     @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 void trim( int height )
         }
     }
 
-    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.text.StringTextComponent;
-import net.minecraft.util.text.TextComponentString;
+import net.minecraft.text.TextComponent;
-import net.minecraft.util.text.TextFormatting;
+import net.minecraft.text.TextFormat;
 import org.apache.commons.lang3.StringUtils;
 
 import javax.annotation.Nullable;
@@ -18,8 +18,8 @@
 
 public interface TableFormatter
 {
-    ITextComponent SEPARATOR = coloured( "| ", TextFormatting.GRAY );
+    TextComponent SEPARATOR = coloured( "| ", TextFormat.GRAY );
-    ITextComponent HEADER = coloured( "=", TextFormatting.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 @@ default int display( TableBuilder table )
         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 @@ default int display( TableBuilder table )
 
         if( headers != null )
         {
-            TextComponentString line = new TextComponentString( "" );
+            StringTextComponent line = new StringTextComponent( "" );
             for( int i = 0; i < columns - 1; i++ )
             {
-                line.appendSibling( headers[i] );
+                line.append( headers[i] );
-                ITextComponent padding = getPadding( headers[i], maxWidths[i] );
+                TextComponent padding = getPadding( headers[i], maxWidths[i] );
-                if( padding != null ) line.appendSibling( padding );
+                if( padding != null ) line.append( padding );
-                line.appendSibling( SEPARATOR );
+                line.append( SEPARATOR );
             }
-            line.appendSibling( headers[columns - 1] );
+            line.append( headers[columns - 1] );
 
             writeLine( rowId++, line );
 
@@ -93,26 +93,26 @@ default int display( TableBuilder table )
             // 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] );
+                line.append( row[i] );
-                ITextComponent padding = getPadding( row[i], maxWidths[i] );
+                TextComponent padding = getPadding( row[i], maxWidths[i] );
-                if( padding != null ) line.appendSibling( padding );
+                if( padding != null ) line.append( padding );
-                line.appendSibling( SEPARATOR );
+                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

@@ -7,27 +7,26 @@
 package dan200.computercraft.shared.common;
 
 import net.minecraft.block.Block;
-import net.minecraft.block.ITileEntityProvider;
+import net.minecraft.block.BlockEntityProvider;
-import net.minecraft.block.state.IBlockState;
+import net.minecraft.block.BlockState;
-import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.block.entity.BlockEntity;
-import net.minecraft.tileentity.TileEntity;
+import net.minecraft.block.entity.BlockEntityType;
-import net.minecraft.tileentity.TileEntityType;
+import net.minecraft.entity.player.PlayerEntity;
-import net.minecraft.util.EnumFacing;
+import net.minecraft.util.Hand;
-import net.minecraft.util.EnumHand;
+import net.minecraft.util.hit.BlockHitResult;
 import net.minecraft.util.math.BlockPos;
-import net.minecraft.world.IBlockReader;
+import net.minecraft.world.BlockView;
-import net.minecraft.world.IWorldReader;
 import net.minecraft.world.World;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 import java.util.Random;
 
-public abstract class BlockGeneric extends Block implements ITileEntityProvider
+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;
@@ -35,52 +34,45 @@ public BlockGeneric( Properties settings, TileEntityType<? extends TileGeneric>
 
     @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 );
+        BlockEntity tile = world.getBlockEntity( pos );
-        super.onReplaced( block, world, pos, replace, bool );
+        super.onBlockRemoved( block, world, pos, replace, bool );
-        world.removeTileEntity( pos );
+        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 );
+        BlockEntity tile = world.getBlockEntity( pos );
-        return tile instanceof TileGeneric && ((TileGeneric) tile).onActivate( player, hand, side, hitX, hitY, hitZ );
+        return tile instanceof TileGeneric && ((TileGeneric) tile).onActivate( player, hand, hit );
     }
 
     @Override
     @Deprecated
-    @SuppressWarnings( "deprecation" )
+    public final void neighborUpdate( BlockState state, World world, BlockPos pos, Block neighbourBlock, BlockPos neighbourPos, boolean flag )
-    public final void neighborChanged( IBlockState state, World world, BlockPos pos, Block neighbourBlock, BlockPos neighbourPos )
     {
-        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();
     }
 
     @Nullable
     @Override
-    public TileEntity createNewTileEntity( @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 boolean isColour()
         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.inventory.CraftingInventory;
-import net.minecraft.item.EnumDyeColor;
 import net.minecraft.item.ItemStack;
-import net.minecraft.item.crafting.IRecipeSerializer;
+import net.minecraft.recipe.RecipeSerializer;
-import net.minecraft.item.crafting.RecipeSerializers;
+import net.minecraft.recipe.SpecialRecipeSerializer;
-import net.minecraft.util.ResourceLocation;
+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 @@ else if( ColourUtils.getStackColour( stack ) != null )
 
     @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 ItemStack getCraftingResult( @Nonnull IInventory inv )
             }
             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 ItemStack getCraftingResult( @Nonnull IInventory inv )
     }
 
     @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<>(
+    public static final RecipeSerializer<?> SERIALIZER = new SpecialRecipeSerializer<>( ColourableRecipe::new );
-        ComputerCraft.MOD_ID + ":colour", 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.container.Container;
-import net.minecraft.inventory.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 ItemStack getStack()
     }
 
     @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 @@
 
 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 @@
 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 @@ default ItemStack withColour( ItemStack stack, int colour )
 
     static int getColourBasic( ItemStack stack )
     {
-        NBTTagCompound tag = stack.getTag();
+        CompoundTag tag = stack.getTag();
-        return tag != null && tag.contains( NBT_COLOUR ) ? tag.getInt( NBT_COLOUR ) : -1;
+        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 boolean isColour()
 
     // 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.fabricmc.fabric.api.block.entity.BlockEntityClientSerializable;
-import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.block.BlockState;
-import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.block.entity.BlockEntity;
-import net.minecraft.network.NetworkManager;
+import net.minecraft.block.entity.BlockEntityType;
-import net.minecraft.network.play.server.SPacketUpdateTileEntity;
+import net.minecraft.entity.player.PlayerEntity;
-import net.minecraft.tileentity.TileEntity;
+import net.minecraft.nbt.CompoundTag;
-import net.minecraft.tileentity.TileEntityType;
+import net.minecraft.util.Hand;
-import net.minecraft.util.EnumFacing;
+import net.minecraft.util.hit.BlockHitResult;
-import net.minecraft.util.EnumHand;
 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 final void updateBlock()
     {
         markDirty();
         BlockPos pos = getPos();
-        IBlockState state = getBlockState();
+        BlockState state = getCachedState();
-        getWorld().markBlockRangeForRenderUpdate( pos, pos );
+        getWorld().scheduleBlockRender( pos );
-        getWorld().notifyBlockUpdate( pos, state, state, 3 );
+        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 @@ protected void blockTick()
     {
     }
 
-    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.shared.computer.blocks.TileCommandComputer;
 import dan200.computercraft.shared.util.NBTUtil;
 import net.minecraft.block.Block;
-import net.minecraft.block.state.IBlockState;
+import net.minecraft.block.BlockState;
-import net.minecraft.command.CommandSource;
+import net.minecraft.block.entity.BlockEntity;
-import net.minecraft.command.Commands;
+import net.minecraft.nbt.CompoundTag;
-import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.server.MinecraftServer;
-import net.minecraft.state.IProperty;
+import net.minecraft.server.command.ServerCommandManager;
-import net.minecraft.tileentity.TileEntity;
+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 @@ private static Map<Object, Object> createOutput( String output )
     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();
+        ServerCommandManager 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 @@ private Object[] doCommand( String command )
     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 );
+        BlockEntity tile = world.getBlockEntity( pos );
-        if( tile != null ) table.put( "nbt", NBTUtil.toLua( tile.write( new NBTTagCompound() ) ) );
+        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 Object[] callMethod( @Nonnull ILuaContext context, int method, @Nonnull O
                     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.ComputerState;
 import dan200.computercraft.shared.computer.items.ComputerItemFactory;
 import net.minecraft.block.Block;
-import net.minecraft.block.state.IBlockState;
+import net.minecraft.block.BlockState;
-import net.minecraft.item.BlockItemUseContext;
+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.StateFactory;
-import net.minecraft.state.EnumProperty;
+import net.minecraft.state.property.DirectionProperty;
-import net.minecraft.state.StateContainer;
+import net.minecraft.state.property.EnumProperty;
-import net.minecraft.state.properties.BlockStateProperties;
+import net.minecraft.state.property.Properties;
-import net.minecraft.tileentity.TileEntityType;
+import net.minecraft.util.math.Direction;
-import net.minecraft.util.EnumFacing;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -26,28 +26,28 @@
 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

@@ -6,32 +6,32 @@
 
 package dan200.computercraft.shared.computer.blocks;
 
+import dan200.computercraft.ComputerCraft;
 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.block.BlockState;
-import net.minecraft.entity.EntityLivingBase;
+import net.minecraft.block.entity.BlockEntity;
-import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.block.entity.BlockEntityType;
-import net.minecraft.fluid.IFluidState;
+import net.minecraft.entity.LivingEntity;
 import net.minecraft.item.ItemStack;
-import net.minecraft.tileentity.TileEntity;
+import net.minecraft.util.Identifier;
-import net.minecraft.tileentity.TileEntityType;
-import net.minecraft.util.EnumFacing;
-import net.minecraft.util.NonNullList;
 import net.minecraft.util.math.BlockPos;
-import net.minecraft.util.math.RayTraceResult;
+import net.minecraft.util.math.Direction;
-import net.minecraft.world.IBlockReader;
+import net.minecraft.world.BlockView;
 import net.minecraft.world.World;
 
 import javax.annotation.Nonnull;
 
 public abstract class BlockComputerBase<T extends TileComputerBase> extends BlockGeneric implements IBundledRedstoneBlock
 {
+    public 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;
@@ -39,35 +39,35 @@ protected BlockComputerBase( Properties settings, ComputerFamily family, TileEnt
 
     @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;
         ServerComputer computer = computerEntity.getServerComputer();
         if( computer == null ) return 0;
 
-        EnumFacing localSide = computerEntity.remapToLocalSide( incomingSide.getOpposite() );
+        Direction localSide = computerEntity.remapToLocalSide( incomingSide.getOpposite() );
         return computerEntity.isRedstoneBlockedOnSide( localSide ) ? 0 :
-            computer.getRedstoneOutput( localSide.getIndex() );
+            computer.getRedstoneOutput( localSide.getId() );
     }
 
     @Nonnull
@@ -80,15 +80,15 @@ public ComputerFamily getFamily()
 
     @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 )
     {
-        TileEntity entity = world.getTileEntity( pos );
+        BlockEntity entity = world.getBlockEntity( pos );
         if( !(entity instanceof TileComputerBase) ) return false;
 
         TileComputerBase computerEntity = (TileComputerBase) entity;
@@ -96,44 +96,46 @@ public boolean getBundledRedstoneConnectivity( World world, BlockPos pos, EnumFa
     }
 
     @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;
         ServerComputer computer = computerEntity.getServerComputer();
         if( computer == null ) return 0;
 
-        EnumFacing localSide = computerEntity.remapToLocalSide( side );
+        Direction localSide = computerEntity.remapToLocalSide( side );
         return computerEntity.isRedstoneBlockedOnSide( localSide ) ? 0 :
-            computer.getBundledRedstoneOutput( localSide.getIndex() );
+            computer.getBundledRedstoneOutput( localSide.getId() );
     }
 
     @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 );
     }
 
+    /*
+    TODO: Find a way of doing creative block drops
     @Override
     @Deprecated
-    public final void dropBlockAsItemWithChance( @Nonnull IBlockState state, World world, @Nonnull BlockPos pos, float change, int fortune )
+    public final void dropBlockAsItemWithChance( @Nonnull BlockState state, World world, @Nonnull BlockPos pos, float change, int fortune )
     {
     }
 
     @Override
-    public final void getDrops( IBlockState state, NonNullList<ItemStack> drops, World world, BlockPos pos, int fortune )
+    public final void getDrops( BlockState state, DefaultedList<ItemStack> drops, World world, BlockPos pos, int fortune )
     {
-        TileEntity tile = world.getTileEntity( pos );
+        BlockEntity tile = world.getBlockEntity( pos );
         if( tile instanceof TileComputerBase )
         {
             ItemStack stack = getItem( (TileComputerBase) tile );
@@ -142,33 +144,34 @@ public final void getDrops( IBlockState state, NonNullList<ItemStack> drops, Wor
     }
 
     @Override
-    public boolean removedByPlayer( IBlockState state, World world, BlockPos pos, EntityPlayer player, boolean willHarvest, IFluidState fluid )
+    public boolean removedByPlayer( BlockState state, World world, BlockPos pos, PlayerEntity player, boolean willHarvest, FluidState fluid )
     {
-        if( !world.isRemote )
+        if( !world.isClient )
         {
             // 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 );
+            BlockEntity tile = world.getBlockEntity( pos );
             if( tile instanceof TileComputerBase )
             {
                 TileComputerBase computer = (TileComputerBase) tile;
-                if( !player.abilities.isCreativeMode || computer.getLabel() != null )
+                if( !player.abilities.creativeMode || computer.getLabel() != null )
                 {
-                    spawnAsEntity( world, pos, getItem( computer ) );
+                    dropStack( 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 )
+    public void onPlaced( World world, BlockPos pos, BlockState state, LivingEntity placer, ItemStack stack )
     {
-        super.onBlockPlacedBy( world, pos, state, placer, stack );
+        super.onPlaced( world, pos, state, placer, stack );
 
-        TileEntity tile = world.getTileEntity( pos );
+        BlockEntity tile = world.getBlockEntity( pos );
-        if( !world.isRemote && tile instanceof IComputerTile && stack.getItem() instanceof IComputerItem )
+        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.core.ComputerFamily;
 import dan200.computercraft.shared.computer.core.ServerComputer;
 import dan200.computercraft.shared.util.NamedBlockEntityType;
-import net.minecraft.command.CommandSource;
+import net.minecraft.block.entity.BlockEntityType;
-import net.minecraft.command.ICommandSource;
+import net.minecraft.entity.player.PlayerEntity;
-import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.server.MinecraftServer;
-import net.minecraft.tileentity.TileEntityType;
+import net.minecraft.server.command.CommandOutput;
-import net.minecraft.util.ResourceLocation;
+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 Map<Integer, String> copyOutput()
         }
 
         @Override
-        public void sendMessage( @Nonnull ITextComponent textComponent )
+        public void appendCommandFeedback( 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 boolean allowLogging()
 
     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 CommandReceiver getReceiver()
         return receiver;
     }
 
-    public CommandSource getSource()
+    public ServerCommandSource getSource()
     {
         ServerComputer computer = getServerComputer();
         String name = "@";
@@ -102,10 +101,10 @@ public CommandSource getSource()
             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,
+            (ServerWorld) getWorld(), 2,
-            name, new TextComponentString( name ),
+            name, new StringTextComponent( name ),
             getWorld().getServer(), null
         );
     }
@@ -119,17 +118,17 @@ protected ServerComputer createComputer( int instanceID, int id )
     }
 
     @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

@@ -12,27 +12,27 @@
 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.block.BlockState;
-import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.block.entity.BlockEntityType;
-import net.minecraft.tileentity.TileEntityType;
+import net.minecraft.entity.player.PlayerEntity;
-import net.minecraft.util.EnumFacing;
+import net.minecraft.util.Identifier;
-import net.minecraft.util.ResourceLocation;
+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 );
     }
@@ -68,26 +68,26 @@ protected TileComputerBase getTile()
     }
 
     @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 );
@@ -95,8 +95,8 @@ protected void updateBlockState( ComputerState newState )
     }
 
     @Override
-    protected EnumFacing remapLocalSide( EnumFacing localSide )
+    protected Direction remapLocalSide( Direction localSide )
     {
-        return localSide.getAxis() == EnumFacing.Axis.X ? localSide.getOpposite() : localSide;
+        return localSide.getAxis() == Direction.Axis.X ? localSide.getOpposite() : localSide;
     }
 }

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

@@ -19,24 +19,25 @@
 import dan200.computercraft.shared.util.DirectionUtil;
 import dan200.computercraft.shared.util.RedstoneUtil;
 import joptsimple.internal.Strings;
-import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.block.entity.BlockEntityType;
-import net.minecraft.init.Items;
+import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.ItemStack;
-import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.item.Items;
-import net.minecraft.tileentity.TileEntityType;
+import net.minecraft.nbt.CompoundTag;
-import net.minecraft.util.EnumFacing;
+import net.minecraft.text.StringTextComponent;
-import net.minecraft.util.EnumHand;
+import net.minecraft.text.TextComponent;
-import net.minecraft.util.INameable;
+import net.minecraft.util.Hand;
-import net.minecraft.util.ITickable;
+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.math.Direction;
-import net.minecraft.util.text.TextComponentString;
 
 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";
@@ -52,7 +53,7 @@ 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;
@@ -62,7 +63,7 @@ protected void unload()
     {
         if( m_instanceID >= 0 )
         {
-            if( !getWorld().isRemote ) ComputerCraft.serverComputerRegistry.remove( m_instanceID );
+            if( !getWorld().isClient ) ComputerCraft.serverComputerRegistry.remove( m_instanceID );
             m_instanceID = -1;
         }
     }
@@ -71,50 +72,52 @@ protected void unload()
     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() );
+                setLabel( currentItem.getDisplayName().getText() );
-                currentItem.shrink( 1 );
+                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 );
@@ -139,7 +142,7 @@ public void onNeighbourTileEntityChange( @Nonnull BlockPos neighbour )
     @Override
     public void tick()
     {
-        if( !getWorld().isRemote )
+        if( !getWorld().isClient )
         {
             ServerComputer computer = createServerComputer();
             if( computer == null ) return;
@@ -177,74 +180,74 @@ public void tick()
 
     @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_computerID = nbt.containsKey( NBT_ID ) ? nbt.getInt( NBT_ID ) : -1;
-        m_label = nbt.contains( NBT_LABEL ) ? nbt.getString( NBT_LABEL ) : null;
+        m_label = nbt.containsKey( NBT_LABEL ) ? nbt.getString( NBT_LABEL ) : null;
         m_on = m_startOn = nbt.getBoolean( NBT_ON );
     }
 
-    protected boolean isPeripheralBlockedOnSide( EnumFacing localSide )
+    protected boolean isPeripheralBlockedOnSide( Direction localSide )
     {
         return false;
     }
 
-    protected boolean isRedstoneBlockedOnSide( EnumFacing localSide )
+    protected boolean isRedstoneBlockedOnSide( Direction localSide )
     {
         return false;
     }
 
-    protected abstract EnumFacing getDirection();
+    protected abstract Direction getDirection();
 
-    protected EnumFacing remapToLocalSide( EnumFacing globalSide )
+    protected Direction remapToLocalSide( Direction globalSide )
     {
         return remapLocalSide( DirectionUtil.toLocal( getDirection(), globalSide ) );
     }
 
-    protected EnumFacing remapLocalSide( EnumFacing localSide )
+    protected Direction remapLocalSide( Direction localSide )
     {
         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();
-        EnumFacing localDir = remapToLocalSide( dir );
+        Direction localDir = remapToLocalSide( dir );
         if( !isRedstoneBlockedOnSide( localDir ) )
         {
-            computer.setRedstoneInput( localDir.getIndex(), getWorld().getRedstonePower( offset, dir ) );
+            computer.setRedstoneInput( localDir.getId(), getWorld().getEmittedRedstonePower( offset, dir ) );
-            computer.setBundledRedstoneInput( localDir.getIndex(), BundledRedstone.getOutput( getWorld(), offset, offsetSide ) );
+            computer.setBundledRedstoneInput( localDir.getId(), BundledRedstone.getOutput( getWorld(), offset, offsetSide ) );
         }
         if( !isPeripheralBlockedOnSide( localDir ) )
         {
-            computer.setPeripheral( localDir.getIndex(), Peripherals.getPeripheral( getWorld(), offset, offsetSide ) );
+            computer.setPeripheral( localDir.getId(), Peripherals.getPeripheral( getWorld(), offset, offsetSide ) );
         }
     }
 
     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 ) );
         }
@@ -252,14 +255,14 @@ public void updateInput()
 
     private void updateInput( BlockPos neighbour )
     {
-        if( getWorld() == null || getWorld().isRemote ) return;
+        if( getWorld() == null || getWorld().isClient ) return;
 
         ServerComputer computer = getServerComputer();
         if( computer == null ) return;
 
         // Find the appropriate side and update.
         BlockPos pos = computer.getPosition();
-        for( EnumFacing dir : DirectionUtil.FACINGS )
+        for( Direction dir : DirectionUtil.FACINGS )
         {
             BlockPos offset = pos.offset( dir );
             if( offset.equals( neighbour ) )
@@ -274,7 +277,7 @@ public void updateOutput()
     {
         // Update redstone
         updateBlock();
-        for( EnumFacing dir : DirectionUtil.FACINGS )
+        for( Direction dir : DirectionUtil.FACINGS )
         {
             RedstoneUtil.propagateRedstoneOutput( getWorld(), getPos(), dir );
         }
@@ -299,7 +302,7 @@ public final String getLabel()
     @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();
@@ -310,7 +313,7 @@ public final void setComputerID( int id )
     @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();
@@ -326,7 +329,7 @@ public ComputerFamily getFamily()
 
     public ServerComputer createServerComputer()
     {
-        if( getWorld().isRemote ) return null;
+        if( getWorld().isClient ) return null;
 
         boolean changed = false;
         if( m_instanceID < 0 )
@@ -351,12 +354,12 @@ public ServerComputer createServerComputer()
 
     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 )
@@ -368,13 +371,13 @@ public ClientComputer createClientComputer()
 
     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 );
 
@@ -384,12 +387,12 @@ protected void writeDescription( @Nonnull NBTTagCompound nbt )
     }
 
     @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_instanceID = nbt.containsKey( NBT_INSTANCE ) ? nbt.getInt( NBT_INSTANCE ) : -1;
-        m_label = nbt.contains( NBT_LABEL ) ? nbt.getString( NBT_LABEL ) : null;
+        m_label = nbt.containsKey( NBT_LABEL ) ? nbt.getString( NBT_LABEL ) : null;
-        m_computerID = nbt.contains( NBT_ID ) ? nbt.getInt( NBT_ID ) : -1;
+        m_computerID = nbt.containsKey( NBT_ID ) ? nbt.getInt( NBT_ID ) : -1;
     }
 
     protected void transferStateFrom( TileComputerBase copy )
@@ -409,16 +412,16 @@ protected void transferStateFrom( TileComputerBase copy )
 
     @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
@@ -429,8 +432,8 @@ public boolean hasCustomName()
 
     @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 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 boolean hasOutputChanged()
         return m_changedLastFrame;
     }
 
-    public NBTTagCompound getUserData()
+    public CompoundTag getUserData()
     {
         return m_userData;
     }
@@ -135,11 +135,11 @@ public void mouseScroll( int direction, int x, int y )
         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

@@ -21,14 +21,13 @@
 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.SharedConstants;
-import net.minecraft.inventory.Container;
+import net.minecraft.container.Container;
-import net.minecraft.nbt.NBTTagCompound;
+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;
@@ -42,7 +41,7 @@ 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;
@@ -133,11 +132,11 @@ public void unload()
         m_computer.unload();
     }
 
-    public NBTTagCompound getUserData()
+    public CompoundTag getUserData()
     {
         if( m_userData == null )
         {
-            m_userData = new NBTTagCompound();
+            m_userData = new CompoundTag();
         }
         return m_userData;
     }
@@ -154,39 +153,41 @@ private NetworkMessage createComputerPacket()
 
     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() );
@@ -195,7 +196,9 @@ public void sendTerminalState( EntityPlayer player )
     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 )
@@ -306,13 +309,13 @@ public void setLabel( String label )
     @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
@@ -342,7 +345,7 @@ public long getComputerSpaceLimit()
     @Override
     public String getHostString()
     {
-        return "ComputerCraft ${version} (Minecraft " + MCPVersion.getMCVersion() + ")";
+        return "ComputerCraft ${version} (Minecraft " + SharedConstants.getGameVersion() + ")";
     }
 
     @Override
@@ -352,18 +355,18 @@ public int assignNewID()
     }
 
     @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.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.container.Container;
-import net.minecraft.inventory.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 InputState getInput()
     }
 
     @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 @@
 
 import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.shared.computer.core.*;
-import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.container.Container;
-import net.minecraft.inventory.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 IComputer getComputer()
     }
 
     @Override
-    public boolean canInteractWith( @Nonnull EntityPlayer player )
+    public boolean canUse( @Nonnull PlayerEntity player )
     {
         if( computer instanceof ServerComputer )
         {
@@ -50,14 +51,14 @@ public boolean canInteractWith( @Nonnull EntityPlayer player )
             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 InputState getInput()
     }
 
     @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 @@
 
 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();
+        CompoundTag nbt = stack.getTag();
-        return nbt != null && nbt.contains( NBT_ID ) ? nbt.getInt( NBT_ID ) : -1;
+        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 @@
 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 ItemStack create( int id, String label )
     {
         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.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.client.item.TooltipContext;
-import net.minecraft.item.ItemBlock;
 import net.minecraft.item.ItemStack;
-import net.minecraft.util.text.ITextComponent;
+import net.minecraft.item.block.BlockItem;
-import net.minecraft.util.text.TextComponentString;
+import net.minecraft.text.StringTextComponent;
-import net.minecraft.util.text.TextComponentTranslation;
+import net.minecraft.text.TextComponent;
-import net.minecraft.util.text.TextFormatting;
+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 )
+                list.add( new TranslatableTextComponent( "gui.computercraft.tooltip.computer_id", id )
-                    .applyTextStyle( TextFormatting.GRAY ) );
+                    .applyFormat( TextFormat.GRAY ) );
             }
         }
     }
@@ -52,7 +52,7 @@ public void addInformation( @Nonnull ItemStack stack, @Nullable World world, @No
     @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 boolean setLabel( @Nonnull ItemStack stack, String label )
     {
         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.recipe.Ingredient;
-import net.minecraft.item.crafting.ShapedRecipe;
+import net.minecraft.recipe.crafting.ShapedRecipe;
-import net.minecraft.util.NonNullList;
+import net.minecraft.util.DefaultedList;
-import net.minecraft.util.ResourceLocation;
+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 ComputerConvertRecipe( ResourceLocation identifier, String group, int wid
     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 boolean matches( @Nonnull IInventory inventory, @Nonnull World world )
 
     @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 );
         }