Merge branch 'mc-1.17.x' into mc-1.18.x

Blurh, still not sure if this is Correct or anything, but have no clue
what's causing this. Fixes #985. Hopefully.

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -8,9 +8,9 @@ body:
     label: Minecraft Version
     description: What version of Minecraft are you using?
     options:
-      - 1.15.x
       - 1.16.x
       - 1.17.x
+      - 1.18.x
   validations:
     required: true
 - type: input

build.gradle

@@ -5,7 +5,7 @@ buildscript {
         maven { url = 'https://maven.parchmentmc.org' }
     }
     dependencies {
-        classpath 'net.minecraftforge.gradle:ForgeGradle:5.1.24'
+        classpath 'net.minecraftforge.gradle:ForgeGradle:5.1.+'
         classpath 'org.parchmentmc:librarian:1.+'
     }
 }
@@ -29,7 +29,7 @@ version = mod_version
 group = "org.squiddev"
 archivesBaseName = "cc-tweaked-${mc_version}"
 
-def javaVersion = JavaLanguageVersion.of(16)
+def javaVersion = JavaLanguageVersion.of(17)
 java {
     toolchain {
         languageVersion = javaVersion
@@ -47,6 +47,7 @@ tasks.withType(JavaExec).configureEach {
 
 sourceSets {
     main.java {
+        exclude 'dan200/computercraft/shared/integration/jei/**'
         exclude 'dan200/computercraft/shared/integration/morered/**'
     }
     main.resources {
@@ -122,7 +123,8 @@ minecraft {
         }
     }
 
-    mappings channel: 'parchment', version: "${mapping_version}-${mc_version}"
+    // mappings channel: 'parchment', version: "${mapping_version}-${mc_version}"
+    mappings channel: 'official', version: mc_version
 
     accessTransformer file('src/main/resources/META-INF/accesstransformer.cfg')
     accessTransformer file('src/testMod/resources/META-INF/accesstransformer.cfg')
@@ -151,10 +153,8 @@ dependencies {
 
     minecraft "net.minecraftforge:forge:${mc_version}-${forge_version}"
 
-    compileOnly fg.deobf("mezz.jei:jei-1.17.1:8.0.0.14:api")
-    // compileOnly fg.deobf("commoble.morered:morered-1.16.5:2.1.1.0")
-
-    runtimeOnly fg.deobf("mezz.jei:jei-1.17.1:8.0.0.14")
+    // compileOnly fg.deobf("mezz.jei:jei-1.17.1:8.0.0.14:api")
+    // runtimeOnly fg.deobf("mezz.jei:jei-1.17.1:8.0.0.14")
 
     shade 'org.squiddev:Cobalt:0.5.2-SNAPSHOT'
 
@@ -166,7 +166,9 @@ dependencies {
     testImplementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.5.2'
 
     testModImplementation sourceSets.main.output
-    testModExtra 'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.5.21'
+    testModExtra('org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.6.0') {
+        exclude group: "org.jetbrains", module: "annotations"
+    }
 
     cctJavadoc 'cc.tweaked:cct-javadoc:1.4.2'
 }

gradle.properties

@@ -1,10 +1,10 @@
 org.gradle.jvmargs=-Xmx3G
 
 # Mod properties
-mod_version=1.99.0
+mod_version=1.99.1
 
 # Minecraft properties (update mods.toml when changing)
-mc_version=1.17.1
+mc_version=1.18.1
 mapping_version=2021.09.05
-forge_version=37.0.85
+forge_version=39.0.0
 # NO SERIOUSLY, UPDATE mods.toml WHEN CHANGING

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

@@ -38,7 +38,7 @@ import net.minecraft.world.level.block.entity.BlockEntity;
 import net.minecraftforge.common.capabilities.Capability;
 import net.minecraftforge.common.util.LazyOptional;
 import net.minecraftforge.fml.ModList;
-import net.minecraftforge.fmllegacy.server.ServerLifecycleHooks;
+import net.minecraftforge.server.ServerLifecycleHooks;
 
 import javax.annotation.Nonnull;
 import java.io.File;

src/main/java/dan200/computercraft/api/lua/IArguments.java

@@ -183,6 +183,24 @@ public interface IArguments
         return (Map<?, ?>) value;
     }
 
+    /**
+     * Get an argument as a table in an unsafe manner.
+     *
+     * Classes implementing this interface may choose to implement a more optimised version which does not copy the
+     * table, instead returning a wrapper version, making it more efficient. However, the caller must guarantee that
+     * they do not access off the computer thread (and so should not be used with main-thread functions) or once the
+     * function call has finished (for instance, in callbacks).
+     *
+     * @param index The argument number.
+     * @return The argument's value.
+     * @throws LuaException If the value is not a table.
+     */
+    @Nonnull
+    default LuaTable<?, ?> getTableUnsafe( int index ) throws LuaException
+    {
+        return new ObjectLuaTable( getTable( index ) );
+    }
+
     /**
      * Get an argument as a double.
      *
@@ -314,6 +332,27 @@ public interface IArguments
         return Optional.of( (Map<?, ?>) value );
     }
 
+    /**
+     * Get an argument as a table in an unsafe manner.
+     *
+     * Classes implementing this interface may choose to implement a more optimised version which does not copy the
+     * table, instead returning a wrapper version, making it more efficient. However, the caller must guarantee that
+     * they do not access off the computer thread (and so should not be used with main-thread functions) or once the
+     * function call has finished (for instance, in callbacks).
+     *
+     * @param index The argument number.
+     * @return The argument's value, or {@link Optional#empty()} if not present.
+     * @throws LuaException If the value is not a table.
+     */
+    @Nonnull
+    default Optional<LuaTable<?, ?>> optTableUnsafe( int index ) throws LuaException
+    {
+        Object value = get( index );
+        if( value == null ) return Optional.empty();
+        if( !(value instanceof Map) ) throw LuaValues.badArgumentOf( index, "map", value );
+        return Optional.of( new ObjectLuaTable( (Map<?, ?>) value ) );
+    }
+
     /**
      * Get an argument as a double.
      *
@@ -404,4 +443,13 @@ public interface IArguments
     {
         return optTable( index ).orElse( def );
     }
+
+    /**
+     * This is called when the current function finishes, before any main thread tasks have run.
+     *
+     * Called when the current function returns, and so some values are no longer guaranteed to be safe to access.
+     */
+    default void releaseImmediate()
+    {
+    }
 }

src/main/java/dan200/computercraft/api/lua/LuaFunction.java

@@ -51,8 +51,17 @@ public @interface LuaFunction
      * Run this function on the main server thread. This should be specified for any method which interacts with
      * Minecraft in a thread-unsafe manner.
      *
-     * @return Whether this functi
+     * @return Whether this function should be run on the main thread.
      * @see ILuaContext#issueMainThreadTask(ILuaTask)
      */
     boolean mainThread() default false;
+
+    /**
+     * Allow using "unsafe" arguments, such {@link IArguments#getTableUnsafe(int)}.
+     *
+     * This is incompatible with {@link #mainThread()}.
+     *
+     * @return Whether this function supports unsafe arguments.
+     */
+    boolean unsafe() default false;
 }

src/main/java/dan200/computercraft/api/lua/LuaTable.java

@@ -0,0 +1,114 @@
+/*
+ * This file is part of the public ComputerCraft API - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2021. This API may be redistributed unmodified and in full only.
+ * For help using the API, and posting your mods, visit the forums at computercraft.info.
+ */
+package dan200.computercraft.api.lua;
+
+import org.jetbrains.annotations.Nullable;
+
+import javax.annotation.Nonnull;
+import java.util.Map;
+
+import static dan200.computercraft.api.lua.LuaValues.*;
+
+public interface LuaTable<K, V> extends Map<K, V>
+{
+    /**
+     * Compute the length of the array part of this table.
+     *
+     * @return This table's length.
+     */
+    default int length()
+    {
+        int size = 0;
+        while( containsKey( (double) (size + 1) ) ) size++;
+        return size;
+    }
+
+    /**
+     * Get an array entry as an integer.
+     *
+     * @param index The index in the table, starting at 1.
+     * @return The table's value.
+     * @throws LuaException If the value is not an integer.
+     */
+    default long getLong( int index ) throws LuaException
+    {
+        Object value = get( (double) index );
+        if( !(value instanceof Number) ) throw badTableItem( index, "number", getType( value ) );
+
+        Number number = (Number) value;
+        double asDouble = number.doubleValue();
+        if( !Double.isFinite( asDouble ) ) throw badTableItem( index, "number", getNumericType( asDouble ) );
+        return number.longValue();
+    }
+
+    /**
+     * Get a table entry as an integer.
+     *
+     * @param key The name of the field in the table.
+     * @return The table's value.
+     * @throws LuaException If the value is not an integer.
+     */
+    default long getLong( String key ) throws LuaException
+    {
+        Object value = get( key );
+        if( !(value instanceof Number) ) throw badField( key, "number", getType( value ) );
+
+        Number number = (Number) value;
+        double asDouble = number.doubleValue();
+        if( !Double.isFinite( asDouble ) ) throw badField( key, "number", getNumericType( asDouble ) );
+        return number.longValue();
+    }
+
+    /**
+     * Get an array entry as an integer.
+     *
+     * @param index The index in the table, starting at 1.
+     * @return The table's value.
+     * @throws LuaException If the value is not an integer.
+     */
+    default int getInt( int index ) throws LuaException
+    {
+        return (int) getLong( index );
+    }
+
+    /**
+     * Get a table entry as an integer.
+     *
+     * @param key The name of the field in the table.
+     * @return The table's value.
+     * @throws LuaException If the value is not an integer.
+     */
+    default int getInt( String key ) throws LuaException
+    {
+        return (int) getLong( key );
+    }
+
+
+    @Nullable
+    @Override
+    default V put( K o, V o2 )
+    {
+        throw new UnsupportedOperationException( "Cannot modify LuaTable" );
+    }
+
+    @Override
+    default V remove( Object o )
+    {
+        throw new UnsupportedOperationException( "Cannot modify LuaTable" );
+    }
+
+    @Override
+    default void putAll( @Nonnull Map<? extends K, ? extends V> map )
+    {
+        throw new UnsupportedOperationException( "Cannot modify LuaTable" );
+    }
+
+    @Override
+    default void clear()
+    {
+        throw new UnsupportedOperationException( "Cannot modify LuaTable" );
+    }
+}

src/main/java/dan200/computercraft/api/lua/LuaValues.java

@@ -102,6 +102,34 @@ public final class LuaValues
         return new LuaException( "bad argument #" + (index + 1) + " (" + expected + " expected, got " + actual + ")" );
     }
 
+    /**
+     * Construct a table item exception, from an expected and actual type.
+     *
+     * @param index    The index into the table, starting from 1.
+     * @param expected The expected type for this table item.
+     * @param actual   The provided type for this table item.
+     * @return The constructed exception, which should be thrown immediately.
+     */
+    @Nonnull
+    public static LuaException badTableItem( int index, @Nonnull String expected, @Nonnull String actual )
+    {
+        return new LuaException( "table item #" + index + " is not " + expected + " (got " + actual + ")" );
+    }
+
+    /**
+     * Construct a field exception, from an expected and actual type.
+     *
+     * @param key      The name of the field.
+     * @param expected The expected type for this table item.
+     * @param actual   The provided type for this table item.
+     * @return The constructed exception, which should be thrown immediately.
+     */
+    @Nonnull
+    public static LuaException badField( String key, @Nonnull String expected, @Nonnull String actual )
+    {
+        return new LuaException( "field " + key + " is not " + expected + " (got " + actual + ")" );
+    }
+
     /**
      * Ensure a numeric argument is finite (i.e. not infinite or {@link Double#NaN}.
      *

src/main/java/dan200/computercraft/api/lua/MethodResult.java

@@ -98,7 +98,10 @@ public final class MethodResult
     {
         Objects.requireNonNull( callback, "callback cannot be null" );
         return new MethodResult( new Object[] { filter }, results -> {
-            if( results.length >= 1 && results[0].equals( "terminate" ) ) throw new LuaException( "Terminated", 0 );
+            if( results.length >= 1 && Objects.equals( results[0], "terminate" ) )
+            {
+                throw new LuaException( "Terminated", 0 );
+            }
             return callback.resume( results );
         } );
     }

src/main/java/dan200/computercraft/api/lua/ObjectArguments.java

@@ -5,10 +5,12 @@
  */
 package dan200.computercraft.api.lua;
 
+import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Objects;
+import java.util.Optional;
 
 /**
  * An implementation of {@link IArguments} which wraps an array of {@link Object}.
@@ -16,6 +18,8 @@ import java.util.Objects;
 public final class ObjectArguments implements IArguments
 {
     private static final IArguments EMPTY = new ObjectArguments();
+
+    private boolean released = false;
     private final List<Object> args;
 
     @Deprecated
@@ -63,4 +67,34 @@ public final class ObjectArguments implements IArguments
     {
         return args.toArray();
     }
+
+    @Nonnull
+    @Override
+    public LuaTable<?, ?> getTableUnsafe( int index ) throws LuaException
+    {
+        if( released )
+        {
+            throw new IllegalStateException( "Cannot use getTableUnsafe after IArguments has been released" );
+        }
+
+        return IArguments.super.getTableUnsafe( index );
+    }
+
+    @Nonnull
+    @Override
+    public Optional<LuaTable<?, ?>> optTableUnsafe( int index ) throws LuaException
+    {
+        if( released )
+        {
+            throw new IllegalStateException( "Cannot use optTableUnsafe after IArguments has been released" );
+        }
+
+        return IArguments.super.optTableUnsafe( index );
+    }
+
+    @Override
+    public void releaseImmediate()
+    {
+        released = true;
+    }
 }

src/main/java/dan200/computercraft/api/lua/ObjectLuaTable.java

@@ -0,0 +1,73 @@
+/*
+ * This file is part of the public ComputerCraft API - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2021. This API may be redistributed unmodified and in full only.
+ * For help using the API, and posting your mods, visit the forums at computercraft.info.
+ */
+package dan200.computercraft.api.lua;
+
+import javax.annotation.Nonnull;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Map;
+import java.util.Set;
+
+public class ObjectLuaTable implements LuaTable<Object, Object>
+{
+    private final Map<Object, Object> map;
+
+    public ObjectLuaTable( Map<?, ?> map )
+    {
+        this.map = Collections.unmodifiableMap( map );
+    }
+
+    @Override
+    public int size()
+    {
+        return map.size();
+    }
+
+    @Override
+    public boolean isEmpty()
+    {
+        return map.isEmpty();
+    }
+
+    @Override
+    public boolean containsKey( Object o )
+    {
+        return map.containsKey( o );
+    }
+
+    @Override
+    public boolean containsValue( Object o )
+    {
+        return map.containsKey( o );
+    }
+
+    @Override
+    public Object get( Object o )
+    {
+        return map.get( o );
+    }
+
+    @Nonnull
+    @Override
+    public Set<Object> keySet()
+    {
+        return map.keySet();
+    }
+
+    @Nonnull
+    @Override
+    public Collection<Object> values()
+    {
+        return map.values();
+    }
+
+    @Nonnull
+    @Override
+    public Set<Entry<Object, Object>> entrySet()
+    {
+        return map.entrySet();
+    }
+}

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

@@ -32,7 +32,7 @@ import net.minecraftforge.api.distmarker.Dist;
 import net.minecraftforge.client.event.ColorHandlerEvent;
 import net.minecraftforge.client.event.EntityRenderersEvent;
 import net.minecraftforge.client.event.ModelRegistryEvent;
-import net.minecraftforge.client.model.ModelLoader;
+import net.minecraftforge.client.model.ForgeModelBakery;
 import net.minecraftforge.client.model.ModelLoaderRegistry;
 import net.minecraftforge.eventbus.api.SubscribeEvent;
 import net.minecraftforge.fml.common.Mod;
@@ -76,7 +76,7 @@ public final class ClientRegistry
         ModelLoaderRegistry.registerLoader( new ResourceLocation( ComputerCraft.MOD_ID, "turtle" ), TurtleModelLoader.INSTANCE );
         for( String model : EXTRA_MODELS )
         {
-            ModelLoader.addSpecialModel( new ModelResourceLocation( new ResourceLocation( ComputerCraft.MOD_ID, model ), "inventory" ) );
+            ForgeModelBakery.addSpecialModel( new ModelResourceLocation( new ResourceLocation( ComputerCraft.MOD_ID, model ), "inventory" ) );
         }
     }
 

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

@@ -8,6 +8,7 @@ package dan200.computercraft.client.gui;
 import com.mojang.blaze3d.vertex.PoseStack;
 import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.client.gui.widgets.ComputerSidebar;
+import dan200.computercraft.client.gui.widgets.DynamicImageButton;
 import dan200.computercraft.client.gui.widgets.WidgetTerminal;
 import dan200.computercraft.shared.computer.core.ClientComputer;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
@@ -102,6 +103,16 @@ public abstract class ComputerScreenBase<T extends ContainerComputerBase> extend
         renderTooltip( stack, mouseX, mouseY );
     }
 
+    @Override
+    public boolean mouseClicked( double x, double y, int button )
+    {
+        boolean changed = super.mouseClicked( x, y, button );
+        // Clicking the terminate/shutdown button steals focus, which means then pressing "enter" will click the button
+        // again. Restore the focus to the terminal in these cases.
+        if( getFocused() instanceof DynamicImageButton ) setFocused( terminal );
+        return changed;
+    }
+
     @Override
     public final boolean mouseDragged( double x, double y, int button, double deltaX, double deltaY )
     {

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

@@ -10,6 +10,7 @@ import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.client.gui.widgets.WidgetTerminal;
 import dan200.computercraft.shared.computer.core.ClientComputer;
 import dan200.computercraft.shared.computer.inventory.ContainerComputerBase;
+import net.minecraft.client.KeyMapping;
 import net.minecraft.client.gui.Font;
 import net.minecraft.client.gui.screens.Screen;
 import net.minecraft.client.gui.screens.inventory.MenuAccess;
@@ -44,8 +45,11 @@ public class NoTermComputerScreen<T extends ContainerComputerBase> extends Scree
     protected void init()
     {
         passEvents = true; // Pass mouse vents through to the game's mouse handler.
+        // First ensure we're still grabbing the mouse, so the user can look around. Then reset bits of state that
+        // grabbing unsets.
         minecraft.mouseHandler.grabMouse();
         minecraft.screen = this;
+        KeyMapping.releaseAll();
 
         super.init();
         minecraft.keyboardHandler.setSendRepeatsToGui( true );

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

@@ -71,12 +71,12 @@ public class DynamicImageButton extends Button
         RenderSystem.disableDepthTest();
 
         int yTex = yTexStart;
-        if( isHovered() ) yTex += yDiffTex;
+        if( isHoveredOrFocused() ) yTex += yDiffTex;
 
         blit( stack, x, y, xTexStart.getAsInt(), yTex, width, height, textureWidth, textureHeight );
         RenderSystem.enableDepthTest();
 
-        if( isHovered() ) renderToolTip( stack, mouseX, mouseY );
+        if( isHovered ) renderToolTip( stack, mouseX, mouseY );
     }
 
     @Nonnull

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

@@ -45,8 +45,8 @@ public final class CableHighlightRenderer
     {
         BlockHitResult hit = event.getTarget();
         BlockPos pos = hit.getBlockPos();
-        Level world = event.getInfo().getEntity().getCommandSenderWorld();
-        Camera info = event.getInfo();
+        Level world = event.getCamera().getEntity().getCommandSenderWorld();
+        Camera info = event.getCamera();
 
         BlockState state = world.getBlockState( pos );
 
@@ -67,9 +67,9 @@ public final class CableHighlightRenderer
         double yOffset = pos.getY() - cameraPos.y();
         double zOffset = pos.getZ() - cameraPos.z();
 
-        VertexConsumer buffer = event.getBuffers().getBuffer( RenderType.lines() );
-        Matrix4f matrix4f = event.getMatrix().last().pose();
-        Matrix3f normal = event.getMatrix().last().normal();
+        VertexConsumer buffer = event.getMultiBufferSource().getBuffer( RenderType.lines() );
+        Matrix4f matrix4f = event.getPoseStack().last().pose();
+        Matrix3f normal = event.getPoseStack().last().normal();
         // TODO: Can we just accesstransformer out LevelRenderer.renderShape?
         shape.forAllEdges( ( x1, y1, z1, x2, y2, z2 ) -> {
             float xDelta = (float) (x2 - x1);

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

@@ -48,7 +48,7 @@ public final class ItemPocketRenderer extends ItemMapLikeRenderer
 
         event.setCanceled( true );
         INSTANCE.renderItemFirstPerson(
-            event.getMatrixStack(), event.getBuffers(), event.getLight(),
+            event.getPoseStack(), event.getMultiBufferSource(), event.getPackedLight(),
             event.getHand(), event.getInterpolatedPitch(), event.getEquipProgress(), event.getSwingProgress(), event.getItemStack()
         );
     }

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

@@ -45,7 +45,7 @@ public final class ItemPrintoutRenderer extends ItemMapLikeRenderer
 
         event.setCanceled( true );
         INSTANCE.renderItemFirstPerson(
-            event.getMatrixStack(), event.getBuffers(), event.getLight(),
+            event.getPoseStack(), event.getMultiBufferSource(), event.getPackedLight(),
             event.getHand(), event.getInterpolatedPitch(), event.getEquipProgress(), event.getSwingProgress(), event.getItemStack()
         );
     }
@@ -63,11 +63,11 @@ public final class ItemPrintoutRenderer extends ItemMapLikeRenderer
     @SubscribeEvent
     public static void onRenderInFrame( RenderItemInFrameEvent event )
     {
-        ItemStack stack = event.getItem();
+        ItemStack stack = event.getItemStack();
         if( !(stack.getItem() instanceof ItemPrintout) ) return;
         event.setCanceled( true );
 
-        PoseStack transform = event.getMatrix();
+        PoseStack transform = event.getPoseStack();
 
         // Move a little bit forward to ensure we're not clipping with the frame
         transform.translate( 0.0f, 0.0f, -0.001f );
@@ -75,8 +75,8 @@ public final class ItemPrintoutRenderer extends ItemMapLikeRenderer
         transform.scale( 0.95f, 0.95f, -0.95f );
         transform.translate( -0.5f, -0.5f, 0.0f );
 
-        int light = event.getEntityItemFrame().getType() == EntityType.GLOW_ITEM_FRAME ? 0xf000d2 : event.getLight(); // See getLightVal.
-        drawPrintout( transform, event.getBuffers(), stack, light );
+        int light = event.getItemFrameEntity().getType() == EntityType.GLOW_ITEM_FRAME ? 0xf000d2 : event.getPackedLight(); // See getLightVal.
+        drawPrintout( transform, event.getMultiBufferSource(), stack, light );
     }
 
     private static void drawPrintout( PoseStack transform, MultiBufferSource render, ItemStack stack, int light )

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

@@ -41,9 +41,9 @@ public final class MonitorHighlightRenderer
     public static void drawHighlight( DrawSelectionEvent.HighlightBlock event )
     {
         // Preserve normal behaviour when crouching.
-        if( event.getInfo().getEntity().isCrouching() ) return;
+        if( event.getCamera().getEntity().isCrouching() ) return;
 
-        Level world = event.getInfo().getEntity().getCommandSenderWorld();
+        Level world = event.getCamera().getEntity().getCommandSenderWorld();
         BlockPos pos = event.getTarget().getBlockPos();
 
         BlockEntity tile = world.getBlockEntity( pos );
@@ -60,13 +60,13 @@ public final class MonitorHighlightRenderer
         if( monitor.getYIndex() != 0 ) faces.remove( monitor.getDown().getOpposite() );
         if( monitor.getYIndex() != monitor.getHeight() - 1 ) faces.remove( monitor.getDown() );
 
-        PoseStack transformStack = event.getMatrix();
-        Vec3 cameraPos = event.getInfo().getPosition();
+        PoseStack transformStack = event.getPoseStack();
+        Vec3 cameraPos = event.getCamera().getPosition();
         transformStack.pushPose();
         transformStack.translate( pos.getX() - cameraPos.x(), pos.getY() - cameraPos.y(), pos.getZ() - cameraPos.z() );
 
         // I wish I could think of a better way to do this
-        VertexConsumer buffer = event.getBuffers().getBuffer( RenderType.lines() );
+        VertexConsumer buffer = event.getMultiBufferSource().getBuffer( RenderType.lines() );
         Matrix4f transform = transformStack.last().pose();
         Matrix3f normal = transformStack.last().normal();
         if( faces.contains( NORTH ) || faces.contains( WEST ) ) line( buffer, transform, normal, 0, 0, 0, UP );

src/main/java/dan200/computercraft/core/asm/Generator.java

@@ -130,8 +130,6 @@ public final class Generator<T>
 
     private void addMethod( List<NamedMethod<T>> methods, Method method, LuaFunction annotation, PeripheralType genericType, T instance )
     {
-        if( annotation.mainThread() ) instance = wrap.apply( instance );
-
         String[] names = annotation.value();
         boolean isSimple = method.getReturnType() != MethodResult.class && !annotation.mainThread();
         if( names.length == 0 )
@@ -183,6 +181,13 @@ public final class Generator<T>
             }
         }
 
+        LuaFunction annotation = method.getAnnotation( LuaFunction.class );
+        if( annotation.unsafe() && annotation.mainThread() )
+        {
+            ComputerCraft.log.error( "Lua Method {} cannot use unsafe and mainThread", name );
+            return Optional.empty();
+        }
+
         // We have some rather ugly handling of static methods in both here and the main generate function. Static methods
         // only come from generic sources, so this should be safe.
         Class<?> target = Modifier.isStatic( modifiers ) ? method.getParameterTypes()[0] : method.getDeclaringClass();
@@ -190,11 +195,13 @@ public final class Generator<T>
         try
         {
             String className = method.getDeclaringClass().getName() + "$cc$" + method.getName() + METHOD_ID.getAndIncrement();
-            byte[] bytes = generate( className, target, method );
+            byte[] bytes = generate( className, target, method, annotation.unsafe() );
             if( bytes == null ) return Optional.empty();
 
             Class<?> klass = DeclaringClassLoader.INSTANCE.define( className, bytes, method.getDeclaringClass().getProtectionDomain() );
-            return Optional.of( klass.asSubclass( base ).getDeclaredConstructor().newInstance() );
+
+            T instance = klass.asSubclass( base ).getDeclaredConstructor().newInstance();
+            return Optional.of( annotation.mainThread() ? wrap.apply( instance ) : instance );
         }
         catch( ReflectiveOperationException | ClassFormatError | RuntimeException e )
         {
@@ -205,7 +212,7 @@ public final class Generator<T>
     }
 
     @Nullable
-    private byte[] generate( String className, Class<?> target, Method method )
+    private byte[] generate( String className, Class<?> target, Method method, boolean unsafe )
     {
         String internalName = className.replace( ".", "/" );
 
@@ -238,7 +245,7 @@ public final class Generator<T>
             int argIndex = 0;
             for( java.lang.reflect.Type genericArg : method.getGenericParameterTypes() )
             {
-                Boolean loadedArg = loadArg( mw, target, method, genericArg, argIndex );
+                Boolean loadedArg = loadArg( mw, target, method, unsafe, genericArg, argIndex );
                 if( loadedArg == null ) return null;
                 if( loadedArg ) argIndex++;
             }
@@ -285,7 +292,7 @@ public final class Generator<T>
         return cw.toByteArray();
     }
 
-    private Boolean loadArg( MethodVisitor mw, Class<?> target, Method method, java.lang.reflect.Type genericArg, int argIndex )
+    private Boolean loadArg( MethodVisitor mw, Class<?> target, Method method, boolean unsafe, java.lang.reflect.Type genericArg, int argIndex )
     {
         if( genericArg == target )
         {
@@ -324,7 +331,7 @@ public final class Generator<T>
                 return true;
             }
 
-            String name = Reflect.getLuaName( Primitives.unwrap( klass ) );
+            String name = Reflect.getLuaName( Primitives.unwrap( klass ), unsafe );
             if( name != null )
             {
                 mw.visitVarInsn( ALOAD, 2 + context.size() );
@@ -344,7 +351,7 @@ public final class Generator<T>
             return true;
         }
 
-        String name = arg == Object.class ? "" : Reflect.getLuaName( arg );
+        String name = arg == Object.class ? "" : Reflect.getLuaName( arg, unsafe );
         if( name != null )
         {
             if( Reflect.getRawType( method, genericArg, false ) == null ) return null;

src/main/java/dan200/computercraft/core/asm/Reflect.java

@@ -6,6 +6,7 @@
 package dan200.computercraft.core.asm;
 
 import dan200.computercraft.ComputerCraft;
+import dan200.computercraft.api.lua.LuaTable;
 import org.objectweb.asm.MethodVisitor;
 
 import javax.annotation.Nullable;
@@ -25,7 +26,7 @@ final class Reflect
     }
 
     @Nullable
-    static String getLuaName( Class<?> klass )
+    static String getLuaName( Class<?> klass, boolean unsafe )
     {
         if( klass.isPrimitive() )
         {
@@ -39,6 +40,7 @@ final class Reflect
             if( klass == Map.class ) return "Table";
             if( klass == String.class ) return "String";
             if( klass == ByteBuffer.class ) return "Bytes";
+            if( klass == LuaTable.class && unsafe ) return "TableUnsafe";
         }
 
         return null;

src/main/java/dan200/computercraft/core/lua/BasicFunction.java

@@ -59,6 +59,10 @@ class BasicFunction extends VarArgFunction
             }
             throw new LuaError( "Java Exception Thrown: " + t, 0 );
         }
+        finally
+        {
+            arguments.releaseImmediate();
+        }
 
         if( results.getCallback() != null )
         {

src/main/java/dan200/computercraft/core/lua/CobaltLuaMachine.java

@@ -15,6 +15,7 @@ import dan200.computercraft.core.tracking.Tracking;
 import dan200.computercraft.core.tracking.TrackingField;
 import dan200.computercraft.shared.util.ThreadUtils;
 import org.squiddev.cobalt.*;
+import org.squiddev.cobalt.LuaTable;
 import org.squiddev.cobalt.compiler.CompileException;
 import org.squiddev.cobalt.compiler.LoadState;
 import org.squiddev.cobalt.debug.DebugFrame;

src/main/java/dan200/computercraft/core/lua/ResultInterpreterFunction.java

@@ -69,6 +69,10 @@ class ResultInterpreterFunction extends ResumableVarArgFunction<ResultInterprete
             }
             throw new LuaError( "Java Exception Thrown: " + t, 0 );
         }
+        finally
+        {
+            arguments.releaseImmediate();
+        }
 
         ILuaCallback callback = results.getCallback();
         Varargs ret = machine.toValues( results.getResult() );

src/main/java/dan200/computercraft/core/lua/TableImpl.java

@@ -0,0 +1,141 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+package dan200.computercraft.core.lua;
+
+import dan200.computercraft.api.lua.LuaException;
+import dan200.computercraft.api.lua.LuaValues;
+import org.squiddev.cobalt.*;
+
+import javax.annotation.Nonnull;
+import java.util.*;
+
+import static dan200.computercraft.api.lua.LuaValues.badTableItem;
+import static dan200.computercraft.api.lua.LuaValues.getNumericType;
+
+class TableImpl implements dan200.computercraft.api.lua.LuaTable<Object, Object>
+{
+    private final VarargArguments arguments;
+    private final LuaTable table;
+    private Map<Object, Object> backingMap;
+
+    TableImpl( VarargArguments arguments, LuaTable table )
+    {
+        this.arguments = arguments;
+        this.table = table;
+    }
+
+    @Override
+    public int size()
+    {
+        checkValid();
+        try
+        {
+            return table.keyCount();
+        }
+        catch( LuaError e )
+        {
+            throw new IllegalStateException( e );
+        }
+    }
+
+    @Override
+    public int length()
+    {
+        return table.length();
+    }
+
+    @Override
+    public long getLong( int index ) throws LuaException
+    {
+        LuaValue value = table.rawget( index );
+        if( !(value instanceof LuaNumber) ) throw LuaValues.badTableItem( index, "number", value.typeName() );
+        if( value instanceof LuaInteger ) return value.toInteger();
+
+        double number = value.toDouble();
+        if( !Double.isFinite( number ) ) throw badTableItem( index, "number", getNumericType( number ) );
+        return (long) number;
+    }
+
+    @Override
+    public boolean isEmpty()
+    {
+        checkValid();
+        try
+        {
+            return table.next( Constants.NIL ).first().isNil();
+        }
+        catch( LuaError e )
+        {
+            throw new IllegalStateException( e );
+        }
+    }
+
+    @Nonnull
+    private LuaValue getImpl( Object o )
+    {
+        checkValid();
+        if( o instanceof String ) return table.rawget( (String) o );
+        if( o instanceof Integer ) return table.rawget( (Integer) o );
+        return Constants.NIL;
+    }
+
+    @Override
+    public boolean containsKey( Object o )
+    {
+        return !getImpl( o ).isNil();
+    }
+
+    @Override
+    public Object get( Object o )
+    {
+        return CobaltLuaMachine.toObject( getImpl( o ), null );
+    }
+
+    @Nonnull
+    private Map<Object, Object> getBackingMap()
+    {
+        checkValid();
+        if( backingMap != null ) return backingMap;
+        return backingMap = Collections.unmodifiableMap(
+            Objects.requireNonNull( (Map<?, ?>) CobaltLuaMachine.toObject( table, null ) )
+        );
+    }
+
+    @Override
+    public boolean containsValue( Object o )
+    {
+        return getBackingMap().containsKey( o );
+    }
+
+    @Nonnull
+    @Override
+    public Set<Object> keySet()
+    {
+        return getBackingMap().keySet();
+    }
+
+    @Nonnull
+    @Override
+    public Collection<Object> values()
+    {
+        return getBackingMap().values();
+    }
+
+    @Nonnull
+    @Override
+    public Set<Entry<Object, Object>> entrySet()
+    {
+        return getBackingMap().entrySet();
+    }
+
+    private void checkValid()
+    {
+        if( arguments.released )
+        {
+            throw new IllegalStateException( "Cannot use LuaTable after IArguments has been released" );
+        }
+    }
+}

src/main/java/dan200/computercraft/core/lua/VarargArguments.java

@@ -19,6 +19,7 @@ class VarargArguments implements IArguments
 {
     static final IArguments EMPTY = new VarargArguments( Constants.NONE );
 
+    boolean released;
     private final Varargs varargs;
     private Object[] cache;
 
@@ -98,4 +99,39 @@ class VarargArguments implements IArguments
         LuaString str = ((LuaBaseString) value).strvalue();
         return Optional.of( ByteBuffer.wrap( str.bytes, str.offset, str.length ).asReadOnlyBuffer() );
     }
+
+    @Nonnull
+    @Override
+    public dan200.computercraft.api.lua.LuaTable<?, ?> getTableUnsafe( int index ) throws LuaException
+    {
+        if( released )
+        {
+            throw new IllegalStateException( "Cannot use getTableUnsafe after IArguments has been released" );
+        }
+
+        LuaValue value = varargs.arg( index + 1 );
+        if( !(value instanceof LuaTable) ) throw LuaValues.badArgument( index, "table", value.typeName() );
+        return new TableImpl( this, (LuaTable) value );
+    }
+
+    @Nonnull
+    @Override
+    public Optional<dan200.computercraft.api.lua.LuaTable<?, ?>> optTableUnsafe( int index ) throws LuaException
+    {
+        if( released )
+        {
+            throw new IllegalStateException( "Cannot use optTableUnsafe after IArguments has been released" );
+        }
+
+        LuaValue value = varargs.arg( index + 1 );
+        if( value.isNil() ) return Optional.empty();
+        if( !(value instanceof LuaTable) ) throw LuaValues.badArgument( index, "table", value.typeName() );
+        return Optional.of( new TableImpl( this, (LuaTable) value ) );
+    }
+
+    @Override
+    public void releaseImmediate()
+    {
+        released = true;
+    }
 }

src/main/java/dan200/computercraft/data/LootTableGenerator.java

@@ -26,7 +26,7 @@ import net.minecraft.world.level.storage.loot.predicates.AlternativeLootItemCond
 import net.minecraft.world.level.storage.loot.predicates.ExplosionCondition;
 import net.minecraft.world.level.storage.loot.predicates.LootItemBlockStatePropertyCondition;
 import net.minecraft.world.level.storage.loot.providers.number.ConstantValue;
-import net.minecraftforge.fmllegacy.RegistryObject;
+import net.minecraftforge.registries.RegistryObject;
 
 import java.util.function.BiConsumer;
 

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

@@ -28,11 +28,11 @@ import net.minecraft.world.level.storage.loot.entries.LootTableReference;
 import net.minecraft.world.level.storage.loot.providers.number.ConstantValue;
 import net.minecraftforge.event.*;
 import net.minecraftforge.event.entity.player.PlayerContainerEvent;
+import net.minecraftforge.event.server.ServerStartedEvent;
+import net.minecraftforge.event.server.ServerStartingEvent;
+import net.minecraftforge.event.server.ServerStoppedEvent;
 import net.minecraftforge.eventbus.api.SubscribeEvent;
 import net.minecraftforge.fml.common.Mod;
-import net.minecraftforge.fmlserverevents.FMLServerStartedEvent;
-import net.minecraftforge.fmlserverevents.FMLServerStartingEvent;
-import net.minecraftforge.fmlserverevents.FMLServerStoppedEvent;
 
 import java.util.Arrays;
 import java.util.HashSet;
@@ -84,7 +84,7 @@ public final class CommonHooks
     }
 
     @SubscribeEvent
-    public static void onServerStarting( FMLServerStartingEvent event )
+    public static void onServerStarting( ServerStartingEvent event )
     {
         MinecraftServer server = event.getServer();
         if( server instanceof DedicatedServer dediServer && dediServer.getProperties().enableJmxMonitoring )
@@ -94,7 +94,7 @@ public final class CommonHooks
     }
 
     @SubscribeEvent
-    public static void onServerStarted( FMLServerStartedEvent event )
+    public static void onServerStarted( ServerStartedEvent event )
     {
         ComputerCraft.serverComputerRegistry.reset();
         WirelessNetwork.resetNetworks();
@@ -104,7 +104,7 @@ public final class CommonHooks
     }
 
     @SubscribeEvent
-    public static void onServerStopped( FMLServerStoppedEvent event )
+    public static void onServerStopped( ServerStoppedEvent event )
     {
         ComputerCraft.serverComputerRegistry.reset();
         WirelessNetwork.resetNetworks();

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

@@ -96,11 +96,11 @@ import net.minecraftforge.fluids.capability.CapabilityFluidHandler;
 import net.minecraftforge.fml.common.Mod;
 import net.minecraftforge.fml.event.lifecycle.FMLCommonSetupEvent;
 import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext;
-import net.minecraftforge.fmllegacy.RegistryObject;
 import net.minecraftforge.items.CapabilityItemHandler;
 import net.minecraftforge.registries.DeferredRegister;
 import net.minecraftforge.registries.ForgeRegistries;
 import net.minecraftforge.registries.RegistryBuilder;
+import net.minecraftforge.registries.RegistryObject;
 
 import java.util.function.BiFunction;
 

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

@@ -13,7 +13,7 @@ import net.minecraftforge.api.distmarker.Dist;
 import net.minecraftforge.client.event.ClientChatEvent;
 import net.minecraftforge.eventbus.api.SubscribeEvent;
 import net.minecraftforge.fml.common.Mod;
-import net.minecraftforge.fmllegacy.server.ServerLifecycleHooks;
+import net.minecraftforge.server.ServerLifecycleHooks;
 
 import java.io.File;
 

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

@@ -19,7 +19,7 @@ import net.minecraft.world.level.block.entity.BlockEntity;
 import net.minecraft.world.level.block.entity.BlockEntityType;
 import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.phys.BlockHitResult;
-import net.minecraftforge.fmllegacy.RegistryObject;
+import net.minecraftforge.registries.RegistryObject;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;

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

@@ -12,11 +12,11 @@ import net.minecraft.network.protocol.game.ClientboundBlockEntityDataPacket;
 import net.minecraft.world.InteractionHand;
 import net.minecraft.world.InteractionResult;
 import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.level.block.Block;
 import net.minecraft.world.level.block.entity.BlockEntity;
 import net.minecraft.world.level.block.entity.BlockEntityType;
 import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.phys.BlockHitResult;
-import net.minecraftforge.common.util.Constants;
 
 import javax.annotation.Nonnull;
 
@@ -36,7 +36,7 @@ public abstract class TileGeneric extends BlockEntity
         setChanged();
         BlockPos pos = getBlockPos();
         BlockState state = getBlockState();
-        getLevel().sendBlockUpdated( pos, state, state, Constants.BlockFlags.DEFAULT );
+        getLevel().sendBlockUpdated( pos, state, state, Block.UPDATE_ALL );
     }
 
     @Nonnull
@@ -73,42 +73,15 @@ public abstract class TileGeneric extends BlockEntity
             player.distanceToSqr( pos.getX() + 0.5, pos.getY() + 0.5, pos.getZ() + 0.5 ) <= range * range;
     }
 
-    protected void writeDescription( @Nonnull CompoundTag nbt )
-    {
-    }
-
-    protected void readDescription( @Nonnull CompoundTag nbt )
-    {
-    }
-
-    @Nonnull
-    @Override
-    public final ClientboundBlockEntityDataPacket getUpdatePacket()
-    {
-        CompoundTag nbt = new CompoundTag();
-        writeDescription( nbt );
-        return new ClientboundBlockEntityDataPacket( worldPosition, 0, nbt );
-    }
-
     @Override
     public final void onDataPacket( Connection net, ClientboundBlockEntityDataPacket packet )
     {
-        if( packet.getType() == 0 ) readDescription( packet.getTag() );
-    }
-
-    @Nonnull
-    @Override
-    public CompoundTag getUpdateTag()
-    {
-        CompoundTag tag = super.getUpdateTag();
-        writeDescription( tag );
-        return tag;
+        var tag = packet.getTag();
+        if( tag != null ) handleUpdateTag( tag );
     }
 
     @Override
     public void handleUpdateTag( @Nonnull CompoundTag tag )
     {
-        super.handleUpdateTag( tag );
-        readDescription( tag );
     }
 }

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

@@ -18,7 +18,7 @@ import net.minecraft.world.level.block.state.StateDefinition;
 import net.minecraft.world.level.block.state.properties.BlockStateProperties;
 import net.minecraft.world.level.block.state.properties.DirectionProperty;
 import net.minecraft.world.level.block.state.properties.EnumProperty;
-import net.minecraftforge.fmllegacy.RegistryObject;
+import net.minecraftforge.registries.RegistryObject;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;

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

@@ -32,7 +32,7 @@ import net.minecraft.world.level.storage.loot.LootContext;
 import net.minecraft.world.level.storage.loot.parameters.LootContextParams;
 import net.minecraft.world.phys.HitResult;
 import net.minecraft.world.phys.Vec3;
-import net.minecraftforge.fmllegacy.RegistryObject;
+import net.minecraftforge.registries.RegistryObject;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -59,7 +59,7 @@ public abstract class BlockComputerBase<T extends TileComputerBase> extends Bloc
         super.onPlace( state, world, pos, oldState, isMoving );
 
         BlockEntity tile = world.getBlockEntity( pos );
-        if( tile instanceof TileComputerBase computer ) computer.updateInputsImmediately( );
+        if( tile instanceof TileComputerBase computer ) computer.updateInputsImmediately();
     }
 
     @Override
@@ -119,7 +119,7 @@ public abstract class BlockComputerBase<T extends TileComputerBase> extends Bloc
 
     @Nonnull
     @Override
-    public ItemStack getPickBlock( BlockState state, HitResult target, BlockGetter world, BlockPos pos, Player player )
+    public ItemStack getCloneItemStack( BlockState state, HitResult target, BlockGetter world, BlockPos pos, Player player )
     {
         BlockEntity tile = world.getBlockEntity( pos );
         if( tile instanceof TileComputerBase )
@@ -128,7 +128,7 @@ public abstract class BlockComputerBase<T extends TileComputerBase> extends Bloc
             if( !result.isEmpty() ) return result;
         }
 
-        return super.getPickBlock( state, target, world, pos, player );
+        return super.getCloneItemStack( state, target, world, pos, player );
     }
 
     @Override

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

@@ -24,6 +24,7 @@ import net.minecraft.nbt.CompoundTag;
 import net.minecraft.network.chat.Component;
 import net.minecraft.network.chat.TextComponent;
 import net.minecraft.network.chat.TranslatableComponent;
+import net.minecraft.network.protocol.game.ClientboundBlockEntityDataPacket;
 import net.minecraft.world.InteractionHand;
 import net.minecraft.world.InteractionResult;
 import net.minecraft.world.MenuProvider;
@@ -187,16 +188,15 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
 
     protected abstract void updateBlockState( ComputerState newState );
 
-    @Nonnull
     @Override
-    public CompoundTag save( @Nonnull CompoundTag nbt )
+    public void saveAdditional( @Nonnull CompoundTag nbt )
     {
         // Save ID, label and power state
         if( computerID >= 0 ) nbt.putInt( NBT_ID, computerID );
         if( label != null ) nbt.putString( NBT_LABEL, label );
         nbt.putBoolean( NBT_ON, on );
 
-        return super.save( nbt );
+        super.saveAdditional( nbt );
     }
 
     @Override
@@ -383,18 +383,27 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
 
     // Networking stuff
 
+    @Nonnull
     @Override
-    protected void writeDescription( @Nonnull CompoundTag nbt )
+    public final ClientboundBlockEntityDataPacket getUpdatePacket()
     {
-        super.writeDescription( nbt );
+        return ClientboundBlockEntityDataPacket.create( this );
+    }
+
+    @Nonnull
+    @Override
+    public CompoundTag getUpdateTag()
+    {
+        // We need this for pick block on the client side.
+        CompoundTag nbt = super.getUpdateTag();
         if( label != null ) nbt.putString( NBT_LABEL, label );
         if( computerID >= 0 ) nbt.putInt( NBT_ID, computerID );
+        return nbt;
     }
 
     @Override
-    protected void readDescription( @Nonnull CompoundTag nbt )
+    public void handleUpdateTag( @Nonnull CompoundTag nbt )
     {
-        super.readDescription( nbt );
         label = nbt.contains( NBT_LABEL ) ? nbt.getString( NBT_LABEL ) : null;
         computerID = nbt.contains( NBT_ID ) ? nbt.getInt( NBT_ID ) : -1;
     }

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

@@ -28,7 +28,7 @@ import net.minecraft.server.MinecraftServer;
 import net.minecraft.world.entity.player.Player;
 import net.minecraft.world.inventory.AbstractContainerMenu;
 import net.minecraft.world.level.Level;
-import net.minecraftforge.fmllegacy.server.ServerLifecycleHooks;
+import net.minecraftforge.server.ServerLifecycleHooks;
 import net.minecraftforge.versions.mcp.MCPVersion;
 
 import javax.annotation.Nonnull;

src/main/java/dan200/computercraft/shared/network/NetworkHandler.java

@@ -16,11 +16,11 @@ import net.minecraft.world.entity.player.Player;
 import net.minecraft.world.level.Level;
 import net.minecraft.world.level.chunk.LevelChunk;
 import net.minecraft.world.phys.Vec3;
-import net.minecraftforge.fmllegacy.network.NetworkDirection;
-import net.minecraftforge.fmllegacy.network.NetworkEvent;
-import net.minecraftforge.fmllegacy.network.NetworkRegistry;
-import net.minecraftforge.fmllegacy.network.PacketDistributor;
-import net.minecraftforge.fmllegacy.network.simple.SimpleChannel;
+import net.minecraftforge.network.NetworkDirection;
+import net.minecraftforge.network.NetworkEvent;
+import net.minecraftforge.network.NetworkRegistry;
+import net.minecraftforge.network.PacketDistributor;
+import net.minecraftforge.network.simple.SimpleChannel;
 
 import java.util.function.Function;
 import java.util.function.Supplier;

src/main/java/dan200/computercraft/shared/network/NetworkMessage.java

@@ -6,7 +6,7 @@
 package dan200.computercraft.shared.network;
 
 import net.minecraft.network.FriendlyByteBuf;
-import net.minecraftforge.fmllegacy.network.NetworkEvent;
+import net.minecraftforge.network.NetworkEvent;
 
 import javax.annotation.Nonnull;
 

src/main/java/dan200/computercraft/shared/network/client/ChatTableClientMessage.java

@@ -10,7 +10,7 @@ import dan200.computercraft.shared.command.text.TableBuilder;
 import dan200.computercraft.shared.network.NetworkMessage;
 import net.minecraft.network.FriendlyByteBuf;
 import net.minecraft.network.chat.Component;
-import net.minecraftforge.fmllegacy.network.NetworkEvent;
+import net.minecraftforge.network.NetworkEvent;
 
 import javax.annotation.Nonnull;
 

src/main/java/dan200/computercraft/shared/network/client/ComputerDataClientMessage.java

@@ -9,7 +9,7 @@ import dan200.computercraft.shared.computer.core.ComputerState;
 import dan200.computercraft.shared.computer.core.ServerComputer;
 import net.minecraft.nbt.CompoundTag;
 import net.minecraft.network.FriendlyByteBuf;
-import net.minecraftforge.fmllegacy.network.NetworkEvent;
+import net.minecraftforge.network.NetworkEvent;
 
 import javax.annotation.Nonnull;
 

src/main/java/dan200/computercraft/shared/network/client/ComputerDeletedClientMessage.java

@@ -7,7 +7,7 @@ package dan200.computercraft.shared.network.client;
 
 import dan200.computercraft.ComputerCraft;
 import net.minecraft.network.FriendlyByteBuf;
-import net.minecraftforge.fmllegacy.network.NetworkEvent;
+import net.minecraftforge.network.NetworkEvent;
 
 public class ComputerDeletedClientMessage extends ComputerClientMessage
 {

src/main/java/dan200/computercraft/shared/network/client/ComputerTerminalClientMessage.java

@@ -6,7 +6,7 @@
 package dan200.computercraft.shared.network.client;
 
 import net.minecraft.network.FriendlyByteBuf;
-import net.minecraftforge.fmllegacy.network.NetworkEvent;
+import net.minecraftforge.network.NetworkEvent;
 
 import javax.annotation.Nonnull;
 

src/main/java/dan200/computercraft/shared/network/client/MonitorClientMessage.java

@@ -12,7 +12,7 @@ import net.minecraft.client.player.LocalPlayer;
 import net.minecraft.core.BlockPos;
 import net.minecraft.network.FriendlyByteBuf;
 import net.minecraft.world.level.block.entity.BlockEntity;
-import net.minecraftforge.fmllegacy.network.NetworkEvent;
+import net.minecraftforge.network.NetworkEvent;
 
 import javax.annotation.Nonnull;
 

src/main/java/dan200/computercraft/shared/network/client/PlayRecordClientMessage.java

@@ -13,7 +13,7 @@ import net.minecraft.network.chat.TextComponent;
 import net.minecraft.sounds.SoundEvent;
 import net.minecraftforge.api.distmarker.Dist;
 import net.minecraftforge.api.distmarker.OnlyIn;
-import net.minecraftforge.fmllegacy.network.NetworkEvent;
+import net.minecraftforge.network.NetworkEvent;
 
 import javax.annotation.Nonnull;
 

src/main/java/dan200/computercraft/shared/network/client/SpeakerMoveClientMessage.java

@@ -11,7 +11,7 @@ import net.minecraft.network.FriendlyByteBuf;
 import net.minecraft.world.phys.Vec3;
 import net.minecraftforge.api.distmarker.Dist;
 import net.minecraftforge.api.distmarker.OnlyIn;
-import net.minecraftforge.fmllegacy.network.NetworkEvent;
+import net.minecraftforge.network.NetworkEvent;
 
 import javax.annotation.Nonnull;
 import java.util.UUID;

src/main/java/dan200/computercraft/shared/network/client/SpeakerPlayClientMessage.java

@@ -12,7 +12,7 @@ import net.minecraft.resources.ResourceLocation;
 import net.minecraft.world.phys.Vec3;
 import net.minecraftforge.api.distmarker.Dist;
 import net.minecraftforge.api.distmarker.OnlyIn;
-import net.minecraftforge.fmllegacy.network.NetworkEvent;
+import net.minecraftforge.network.NetworkEvent;
 
 import javax.annotation.Nonnull;
 import java.util.UUID;

src/main/java/dan200/computercraft/shared/network/client/SpeakerStopClientMessage.java

@@ -10,7 +10,7 @@ import dan200.computercraft.shared.network.NetworkMessage;
 import net.minecraft.network.FriendlyByteBuf;
 import net.minecraftforge.api.distmarker.Dist;
 import net.minecraftforge.api.distmarker.OnlyIn;
-import net.minecraftforge.fmllegacy.network.NetworkEvent;
+import net.minecraftforge.network.NetworkEvent;
 
 import javax.annotation.Nonnull;
 import java.util.UUID;

src/main/java/dan200/computercraft/shared/network/client/UpgradesLoadedMessage.java

@@ -17,7 +17,7 @@ import dan200.computercraft.shared.UpgradeManager;
 import dan200.computercraft.shared.network.NetworkMessage;
 import net.minecraft.network.FriendlyByteBuf;
 import net.minecraft.resources.ResourceLocation;
-import net.minecraftforge.fmllegacy.network.NetworkEvent;
+import net.minecraftforge.network.NetworkEvent;
 import net.minecraftforge.registries.IForgeRegistry;
 import net.minecraftforge.registries.RegistryManager;
 

src/main/java/dan200/computercraft/shared/network/client/UploadResultMessage.java

@@ -13,7 +13,7 @@ import net.minecraft.client.Minecraft;
 import net.minecraft.client.gui.screens.Screen;
 import net.minecraft.network.FriendlyByteBuf;
 import net.minecraft.network.chat.Component;
-import net.minecraftforge.fmllegacy.network.NetworkEvent;
+import net.minecraftforge.network.NetworkEvent;
 
 import javax.annotation.Nonnull;
 

src/main/java/dan200/computercraft/shared/network/container/ContainerData.java

@@ -12,16 +12,16 @@ import net.minecraft.world.entity.player.Inventory;
 import net.minecraft.world.entity.player.Player;
 import net.minecraft.world.inventory.AbstractContainerMenu;
 import net.minecraft.world.inventory.MenuType;
-import net.minecraftforge.common.extensions.IForgeContainerType;
-import net.minecraftforge.fmllegacy.network.IContainerFactory;
-import net.minecraftforge.fmllegacy.network.NetworkHooks;
+import net.minecraftforge.common.extensions.IForgeMenuType;
+import net.minecraftforge.network.IContainerFactory;
+import net.minecraftforge.network.NetworkHooks;
 
 import javax.annotation.Nonnull;
 import java.util.function.Consumer;
 import java.util.function.Function;
 
 /**
- * An extension over the basic {@link IForgeContainerType}/{@link NetworkHooks#openGui(ServerPlayer, MenuProvider, Consumer)}
+ * An extension over the basic {@link IForgeMenuType}/{@link NetworkHooks#openGui(ServerPlayer, MenuProvider, Consumer)}
  * hooks, with a more convenient way of reading and writing data.
  */
 public interface ContainerData
@@ -35,7 +35,7 @@ public interface ContainerData
 
     static <C extends AbstractContainerMenu, T extends ContainerData> MenuType<C> toType( Function<FriendlyByteBuf, T> reader, Factory<C, T> factory )
     {
-        return IForgeContainerType.create( ( id, player, data ) -> factory.create( id, player, reader.apply( data ) ) );
+        return IForgeMenuType.create( ( id, player, data ) -> factory.create( id, player, reader.apply( data ) ) );
     }
 
     static <C extends AbstractContainerMenu, T extends ContainerData> MenuType<C> toType( Function<FriendlyByteBuf, T> reader, FixedFactory<C, T> factory )
@@ -60,7 +60,7 @@ public interface ContainerData
 
         private FixedPointContainerFactory( Function<FriendlyByteBuf, T> reader, FixedFactory<C, T> factory )
         {
-            MenuType<C> type = this.type = IForgeContainerType.create( this );
+            MenuType<C> type = this.type = IForgeMenuType.create( this );
             impl = ( id, player, data ) -> factory.create( type, id, player, reader.apply( data ) );
         }
 

src/main/java/dan200/computercraft/shared/network/server/ComputerActionServerMessage.java

@@ -8,7 +8,7 @@ package dan200.computercraft.shared.network.server;
 import dan200.computercraft.shared.computer.core.IContainerComputer;
 import dan200.computercraft.shared.computer.core.ServerComputer;
 import net.minecraft.network.FriendlyByteBuf;
-import net.minecraftforge.fmllegacy.network.NetworkEvent;
+import net.minecraftforge.network.NetworkEvent;
 
 import javax.annotation.Nonnull;
 

src/main/java/dan200/computercraft/shared/network/server/ComputerServerMessage.java

@@ -10,7 +10,7 @@ import dan200.computercraft.shared.computer.core.IContainerComputer;
 import dan200.computercraft.shared.computer.core.ServerComputer;
 import dan200.computercraft.shared.network.NetworkMessage;
 import net.minecraft.network.FriendlyByteBuf;
-import net.minecraftforge.fmllegacy.network.NetworkEvent;
+import net.minecraftforge.network.NetworkEvent;
 
 import javax.annotation.Nonnull;
 

src/main/java/dan200/computercraft/shared/network/server/ContinueUploadMessage.java

@@ -9,7 +9,7 @@ import dan200.computercraft.shared.computer.core.IContainerComputer;
 import dan200.computercraft.shared.computer.core.ServerComputer;
 import net.minecraft.network.FriendlyByteBuf;
 import net.minecraft.server.level.ServerPlayer;
-import net.minecraftforge.fmllegacy.network.NetworkEvent;
+import net.minecraftforge.network.NetworkEvent;
 
 import javax.annotation.Nonnull;
 

src/main/java/dan200/computercraft/shared/network/server/KeyEventServerMessage.java

@@ -9,7 +9,7 @@ import dan200.computercraft.shared.computer.core.IContainerComputer;
 import dan200.computercraft.shared.computer.core.InputState;
 import dan200.computercraft.shared.computer.core.ServerComputer;
 import net.minecraft.network.FriendlyByteBuf;
-import net.minecraftforge.fmllegacy.network.NetworkEvent;
+import net.minecraftforge.network.NetworkEvent;
 
 import javax.annotation.Nonnull;
 

src/main/java/dan200/computercraft/shared/network/server/MouseEventServerMessage.java

@@ -9,7 +9,7 @@ import dan200.computercraft.shared.computer.core.IContainerComputer;
 import dan200.computercraft.shared.computer.core.InputState;
 import dan200.computercraft.shared.computer.core.ServerComputer;
 import net.minecraft.network.FriendlyByteBuf;
-import net.minecraftforge.fmllegacy.network.NetworkEvent;
+import net.minecraftforge.network.NetworkEvent;
 
 import javax.annotation.Nonnull;
 

src/main/java/dan200/computercraft/shared/network/server/QueueEventServerMessage.java

@@ -10,7 +10,7 @@ import dan200.computercraft.shared.computer.core.ServerComputer;
 import dan200.computercraft.shared.util.NBTUtil;
 import net.minecraft.nbt.CompoundTag;
 import net.minecraft.network.FriendlyByteBuf;
-import net.minecraftforge.fmllegacy.network.NetworkEvent;
+import net.minecraftforge.network.NetworkEvent;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;

src/main/java/dan200/computercraft/shared/network/server/RequestComputerMessage.java

@@ -9,7 +9,7 @@ import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.shared.computer.core.ServerComputer;
 import dan200.computercraft.shared.network.NetworkMessage;
 import net.minecraft.network.FriendlyByteBuf;
-import net.minecraftforge.fmllegacy.network.NetworkEvent;
+import net.minecraftforge.network.NetworkEvent;
 
 import javax.annotation.Nonnull;
 

src/main/java/dan200/computercraft/shared/network/server/UploadFileMessage.java

@@ -14,7 +14,7 @@ import dan200.computercraft.shared.network.NetworkHandler;
 import io.netty.handler.codec.DecoderException;
 import net.minecraft.network.FriendlyByteBuf;
 import net.minecraft.server.level.ServerPlayer;
-import net.minecraftforge.fmllegacy.network.NetworkEvent;
+import net.minecraftforge.network.NetworkEvent;
 
 import javax.annotation.Nonnull;
 import java.nio.ByteBuffer;

src/main/java/dan200/computercraft/shared/peripheral/diskdrive/TileDiskDrive.java

@@ -37,9 +37,9 @@ import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.phys.BlockHitResult;
 import net.minecraftforge.common.capabilities.Capability;
 import net.minecraftforge.common.util.LazyOptional;
-import net.minecraftforge.fmllegacy.network.NetworkHooks;
 import net.minecraftforge.items.IItemHandlerModifiable;
 import net.minecraftforge.items.wrapper.InvWrapper;
+import net.minecraftforge.network.NetworkHooks;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -137,9 +137,8 @@ public final class TileDiskDrive extends TileGeneric implements DefaultInventory
         }
     }
 
-    @Nonnull
     @Override
-    public CompoundTag save( @Nonnull CompoundTag nbt )
+    public void saveAdditional( @Nonnull CompoundTag nbt )
     {
         if( customName != null ) nbt.putString( NBT_NAME, Component.Serializer.toJson( customName ) );
 
@@ -149,7 +148,7 @@ public final class TileDiskDrive extends TileGeneric implements DefaultInventory
             diskStack.save( item );
             nbt.put( NBT_ITEM, item );
         }
-        return super.save( nbt );
+        super.saveAdditional( nbt );
     }
 
     void serverTick()

src/main/java/dan200/computercraft/shared/peripheral/generic/data/ItemData.java

@@ -60,9 +60,9 @@ public class ItemData
             data.put( "maxDamage", stack.getMaxDamage() );
         }
 
-        if( stack.getItem().showDurabilityBar( stack ) )
+        if( stack.getItem().isBarVisible( stack ) )
         {
-            data.put( "durability", stack.getItem().getDurabilityForDisplay( stack ) );
+            data.put( "durability", stack.getItem().getBarWidth( stack ) / 13.0 );
         }
 
         data.put( "tags", DataHelpers.getTags( stack.getItem().getTags() ) );

src/main/java/dan200/computercraft/shared/peripheral/modem/wired/BlockCable.java

@@ -98,7 +98,7 @@ public class BlockCable extends BlockGeneric implements SimpleWaterloggedBlock
     }
 
     @Override
-    public boolean removedByPlayer( BlockState state, Level world, BlockPos pos, Player player, boolean willHarvest, FluidState fluid )
+    public boolean onDestroyedByPlayer( BlockState state, Level world, BlockPos pos, Player player, boolean willHarvest, FluidState fluid )
     {
         if( state.getValue( CABLE ) && state.getValue( MODEM ).getFacing() != null )
         {
@@ -140,12 +140,12 @@ public class BlockCable extends BlockGeneric implements SimpleWaterloggedBlock
             }
         }
 
-        return super.removedByPlayer( state, world, pos, player, willHarvest, fluid );
+        return super.onDestroyedByPlayer( state, world, pos, player, willHarvest, fluid );
     }
 
     @Nonnull
     @Override
-    public ItemStack getPickBlock( BlockState state, HitResult hit, BlockGetter world, BlockPos pos, Player player )
+    public ItemStack getCloneItemStack( BlockState state, HitResult hit, BlockGetter world, BlockPos pos, Player player )
     {
         Direction modem = state.getValue( MODEM ).getFacing();
         boolean cable = state.getValue( CABLE );

src/main/java/dan200/computercraft/shared/peripheral/modem/wired/TileCable.java

@@ -292,13 +292,12 @@ public class TileCable extends TileGeneric
         peripheral.read( nbt, "" );
     }
 
-    @Nonnull
     @Override
-    public CompoundTag save( CompoundTag nbt )
+    public void saveAdditional( CompoundTag nbt )
     {
         nbt.putBoolean( NBT_PERIPHERAL_ENABLED, peripheralAccessAllowed );
         peripheral.write( nbt, "" );
-        return super.save( nbt );
+        super.saveAdditional( nbt );
     }
 
     private void updateBlockState()
@@ -346,7 +345,7 @@ public class TileCable extends TileGeneric
         for( Direction facing : DirectionUtil.FACINGS )
         {
             BlockPos offset = current.relative( facing );
-            if( !world.isAreaLoaded( offset, 0 ) ) continue;
+            if( !world.isLoaded( offset ) ) continue;
 
             LazyOptional<IWiredElement> element = ComputerCraftAPI.getWiredElementAt( world, offset, facing.getOpposite() );
             if( !element.isPresent() ) continue;

src/main/java/dan200/computercraft/shared/peripheral/modem/wired/TileWiredModemFull.java

@@ -241,13 +241,12 @@ public class TileWiredModemFull extends TileGeneric
         for( int i = 0; i < peripherals.length; i++ ) peripherals[i].read( nbt, Integer.toString( i ) );
     }
 
-    @Nonnull
     @Override
-    public CompoundTag save( CompoundTag nbt )
+    public void saveAdditional( CompoundTag nbt )
     {
         nbt.putBoolean( NBT_PERIPHERAL_ENABLED, peripheralAccessAllowed );
         for( int i = 0; i < peripherals.length; i++ ) peripherals[i].write( nbt, Integer.toString( i ) );
-        return super.save( nbt );
+        super.saveAdditional( nbt );
     }
 
     private void updateBlockState()
@@ -306,7 +305,7 @@ public class TileWiredModemFull extends TileGeneric
         for( Direction facing : DirectionUtil.FACINGS )
         {
             BlockPos offset = current.relative( facing );
-            if( !world.isAreaLoaded( offset, 0 ) ) continue;
+            if( !world.isLoaded( offset ) ) continue;
 
             LazyOptional<IWiredElement> element = ComputerCraftAPI.getWiredElementAt( world, offset, facing.getOpposite() );
             if( !element.isPresent() ) continue;

src/main/java/dan200/computercraft/shared/peripheral/modem/wireless/BlockWirelessModem.java

@@ -25,7 +25,7 @@ import net.minecraft.world.level.block.state.properties.DirectionProperty;
 import net.minecraft.world.level.material.FluidState;
 import net.minecraft.world.phys.shapes.CollisionContext;
 import net.minecraft.world.phys.shapes.VoxelShape;
-import net.minecraftforge.fmllegacy.RegistryObject;
+import net.minecraftforge.registries.RegistryObject;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;

src/main/java/dan200/computercraft/shared/peripheral/monitor/BlockMonitor.java

@@ -21,7 +21,7 @@ import net.minecraft.world.level.block.state.properties.BlockStateProperties;
 import net.minecraft.world.level.block.state.properties.DirectionProperty;
 import net.minecraft.world.level.block.state.properties.EnumProperty;
 import net.minecraftforge.common.util.FakePlayer;
-import net.minecraftforge.fmllegacy.RegistryObject;
+import net.minecraftforge.registries.RegistryObject;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;

src/main/java/dan200/computercraft/shared/peripheral/monitor/Expander.java

@@ -94,9 +94,12 @@ class Expander
         if( !isPositive )
         {
             BlockEntity otherOrigin = level.getBlockEntity( otherMonitor.toWorldPos( 0, 0 ) );
-            if( otherOrigin == null || !origin.isCompatible( (TileMonitor) otherOrigin ) ) return false;
+            if( !(otherOrigin instanceof TileMonitor originMonitor) || !origin.isCompatible( originMonitor ) )
+            {
+                return false;
+            }
 
-            origin = (TileMonitor) otherOrigin;
+            origin = originMonitor;
         }
 
         this.width = width;

src/main/java/dan200/computercraft/shared/peripheral/monitor/MonitorWatcher.java

@@ -101,7 +101,7 @@ public final class MonitorWatcher
             if( !(world instanceof ServerLevel) ) continue;
 
             LevelChunk chunk = world.getChunkAt( pos );
-            if( ((ServerLevel) world).getChunkSource().chunkMap.getPlayers( chunk.getPos(), false ).findAny().isEmpty() )
+            if( ((ServerLevel) world).getChunkSource().chunkMap.getPlayers( chunk.getPos(), false ).isEmpty() )
             {
                 continue;
             }

src/main/java/dan200/computercraft/shared/peripheral/monitor/TileMonitor.java

@@ -17,6 +17,7 @@ import dan200.computercraft.shared.util.TickScheduler;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.Direction;
 import net.minecraft.nbt.CompoundTag;
+import net.minecraft.network.protocol.game.ClientboundBlockEntityDataPacket;
 import net.minecraft.world.InteractionHand;
 import net.minecraft.world.InteractionResult;
 import net.minecraft.world.entity.player.Player;
@@ -126,15 +127,14 @@ public class TileMonitor extends TileGeneric
         return InteractionResult.PASS;
     }
 
-    @Nonnull
     @Override
-    public CompoundTag save( CompoundTag tag )
+    public void saveAdditional( CompoundTag tag )
     {
         tag.putInt( NBT_X, xIndex );
         tag.putInt( NBT_Y, yIndex );
         tag.putInt( NBT_WIDTH, width );
         tag.putInt( NBT_HEIGHT, height );
-        return super.save( tag );
+        super.saveAdditional( tag );
     }
 
     @Override
@@ -236,7 +236,6 @@ public class TileMonitor extends TileGeneric
         {
             // Otherwise fetch the origin and attempt to get its monitor
             // Note this may load chunks, but we don't really have a choice here.
-            BlockPos pos = getBlockPos();
             BlockEntity te = level.getBlockEntity( toWorldPos( 0, 0 ) );
             if( !(te instanceof TileMonitor) ) return null;
 
@@ -249,7 +248,6 @@ public class TileMonitor extends TileGeneric
     {
         if( clientMonitor != null ) return clientMonitor;
 
-        BlockPos pos = getBlockPos();
         BlockEntity te = level.getBlockEntity( toWorldPos( 0, 0 ) );
         if( !(te instanceof TileMonitor) ) return null;
 
@@ -258,20 +256,29 @@ public class TileMonitor extends TileGeneric
 
     // Networking stuff
 
+    @Nonnull
     @Override
-    protected void writeDescription( @Nonnull CompoundTag nbt )
+    public final ClientboundBlockEntityDataPacket getUpdatePacket()
     {
-        super.writeDescription( nbt );
+        return ClientboundBlockEntityDataPacket.create( this );
+    }
+
+    @Nonnull
+    @Override
+    public final CompoundTag getUpdateTag()
+    {
+        CompoundTag nbt = super.getUpdateTag();
         nbt.putInt( NBT_X, xIndex );
         nbt.putInt( NBT_Y, yIndex );
         nbt.putInt( NBT_WIDTH, width );
         nbt.putInt( NBT_HEIGHT, height );
+        return nbt;
     }
 
     @Override
-    protected final void readDescription( @Nonnull CompoundTag nbt )
+    public final void handleUpdateTag( @Nonnull CompoundTag nbt )
     {
-        super.readDescription( nbt );
+        super.handleUpdateTag( nbt );
 
         int oldXIndex = xIndex;
         int oldYIndex = yIndex;
@@ -390,7 +397,7 @@ public class TileMonitor extends TileGeneric
         BlockPos pos = toWorldPos( x, y );
 
         Level world = getLevel();
-        if( world == null || !world.isAreaLoaded( pos, 0 ) ) return MonitorState.UNLOADED;
+        if( world == null || !world.isLoaded( pos ) ) return MonitorState.UNLOADED;
 
         BlockEntity tile = world.getBlockEntity( pos );
         if( !(tile instanceof TileMonitor monitor) ) return MonitorState.MISSING;

src/main/java/dan200/computercraft/shared/peripheral/printer/TilePrinter.java

@@ -31,10 +31,10 @@ import net.minecraft.world.phys.BlockHitResult;
 import net.minecraft.world.phys.Vec3;
 import net.minecraftforge.common.capabilities.Capability;
 import net.minecraftforge.common.util.LazyOptional;
-import net.minecraftforge.fmllegacy.network.NetworkHooks;
 import net.minecraftforge.items.IItemHandler;
 import net.minecraftforge.items.wrapper.InvWrapper;
 import net.minecraftforge.items.wrapper.SidedInvWrapper;
+import net.minecraftforge.network.NetworkHooks;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -113,9 +113,8 @@ public final class TilePrinter extends TileGeneric implements DefaultSidedInvent
         ContainerHelper.loadAllItems( nbt, inventory );
     }
 
-    @Nonnull
     @Override
-    public CompoundTag save( @Nonnull CompoundTag nbt )
+    public void saveAdditional( @Nonnull CompoundTag nbt )
     {
         if( customName != null ) nbt.putString( NBT_NAME, Component.Serializer.toJson( customName ) );
 
@@ -130,7 +129,7 @@ public final class TilePrinter extends TileGeneric implements DefaultSidedInvent
         // Write inventory
         ContainerHelper.saveAllItems( nbt, inventory );
 
-        return super.save( nbt );
+        super.saveAdditional( nbt );
     }
 
     boolean isPrinting()

src/main/java/dan200/computercraft/shared/peripheral/speaker/UpgradeSpeakerPeripheral.java

@@ -9,8 +9,7 @@ import dan200.computercraft.api.peripheral.IComputerAccess;
 import dan200.computercraft.shared.network.NetworkHandler;
 import dan200.computercraft.shared.network.client.SpeakerStopClientMessage;
 import net.minecraft.server.MinecraftServer;
-import net.minecraftforge.fml.LogicalSide;
-import net.minecraftforge.fmllegacy.LogicalSidedProvider;
+import net.minecraftforge.server.ServerLifecycleHooks;
 
 import javax.annotation.Nonnull;
 import java.util.UUID;
@@ -34,7 +33,7 @@ public abstract class UpgradeSpeakerPeripheral extends SpeakerPeripheral
     public void detach( @Nonnull IComputerAccess computer )
     {
         // We could be in the process of shutting down the server, so we can't send packets in this case.
-        MinecraftServer server = LogicalSidedProvider.INSTANCE.get( LogicalSide.SERVER );
+        MinecraftServer server = ServerLifecycleHooks.getCurrentServer();
         if( server == null || server.isStopped() ) return;
 
         NetworkHandler.sendToAllPlayers( new SpeakerStopClientMessage( source ) );

src/main/java/dan200/computercraft/shared/turtle/blocks/BlockTurtle.java

@@ -42,7 +42,7 @@ import net.minecraft.world.phys.Vec3;
 import net.minecraft.world.phys.shapes.CollisionContext;
 import net.minecraft.world.phys.shapes.Shapes;
 import net.minecraft.world.phys.shapes.VoxelShape;
-import net.minecraftforge.fmllegacy.RegistryObject;
+import net.minecraftforge.registries.RegistryObject;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;

src/main/java/dan200/computercraft/shared/turtle/blocks/TileTurtle.java

@@ -289,9 +289,8 @@ public class TileTurtle extends TileComputerBase implements ITurtleTile, Default
         brain.readFromNBT( nbt );
     }
 
-    @Nonnull
     @Override
-    public CompoundTag save( @Nonnull CompoundTag nbt )
+    public void saveAdditional( @Nonnull CompoundTag nbt )
     {
         // Write inventory
         ListTag nbttaglist = new ListTag();
@@ -310,7 +309,7 @@ public class TileTurtle extends TileComputerBase implements ITurtleTile, Default
         // Write brain
         nbt = brain.writeToNBT( nbt );
 
-        return super.save( nbt );
+        super.saveAdditional( nbt );
     }
 
     @Override
@@ -504,17 +503,19 @@ public class TileTurtle extends TileComputerBase implements ITurtleTile, Default
 
     // Networking stuff
 
+    @Nonnull
     @Override
-    protected void writeDescription( @Nonnull CompoundTag nbt )
+    public CompoundTag getUpdateTag()
     {
-        super.writeDescription( nbt );
+        CompoundTag nbt = super.getUpdateTag();
         brain.writeDescription( nbt );
+        return nbt;
     }
 
     @Override
-    protected void readDescription( @Nonnull CompoundTag nbt )
+    public void handleUpdateTag( @Nonnull CompoundTag nbt )
     {
-        super.readDescription( nbt );
+        super.handleUpdateTag( nbt );
         brain.readDescription( nbt );
     }
 

src/main/java/dan200/computercraft/shared/turtle/core/TurtleBrain.java

@@ -304,7 +304,7 @@ public class TurtleBrain implements ITurtleAccess
         }
 
         // Ensure the chunk is loaded
-        if( !world.isAreaLoaded( pos, 0 ) ) return false;
+        if( !world.isLoaded( pos ) ) return false;
 
         // Ensure we're inside the world border
         if( !world.getWorldBorder().isWithinBounds( pos ) ) return false;

src/main/java/dan200/computercraft/shared/turtle/core/TurtleMoveCommand.java

@@ -137,7 +137,7 @@ public class TurtleMoveCommand implements ITurtleCommand
             return TurtleCommandResult.failure( "Cannot enter protected area" );
         }
 
-        if( !world.isAreaLoaded( position, 0 ) ) return TurtleCommandResult.failure( "Cannot leave loaded world" );
+        if( !world.isLoaded( position ) ) return TurtleCommandResult.failure( "Cannot leave loaded world" );
         if( !world.getWorldBorder().isWithinBounds( position ) )
         {
             return TurtleCommandResult.failure( "Cannot pass the world border" );

src/main/java/dan200/computercraft/shared/turtle/core/TurtlePlaceCommand.java

@@ -27,13 +27,13 @@ import net.minecraft.world.item.*;
 import net.minecraft.world.item.context.BlockPlaceContext;
 import net.minecraft.world.item.context.UseOnContext;
 import net.minecraft.world.level.Level;
+import net.minecraft.world.level.block.Block;
 import net.minecraft.world.level.block.entity.BlockEntity;
 import net.minecraft.world.level.block.entity.SignBlockEntity;
 import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.phys.BlockHitResult;
 import net.minecraft.world.phys.Vec3;
 import net.minecraftforge.common.ForgeHooks;
-import net.minecraftforge.common.util.Constants;
 import net.minecraftforge.event.entity.player.PlayerInteractEvent;
 import net.minecraftforge.eventbus.api.Event.Result;
 import net.minecraftforge.items.IItemHandler;
@@ -321,7 +321,7 @@ public class TurtlePlaceCommand implements ITurtleCommand
             }
         }
         signTile.setChanged();
-        world.sendBlockUpdated( tile.getBlockPos(), tile.getBlockState(), tile.getBlockState(), Constants.BlockFlags.DEFAULT );
+        world.sendBlockUpdated( tile.getBlockPos(), tile.getBlockState(), tile.getBlockState(), Block.UPDATE_ALL );
     }
 
     private static class ErrorMessage

src/main/java/dan200/computercraft/shared/turtle/upgrades/TurtleInventoryCrafting.java

@@ -17,7 +17,7 @@ import net.minecraft.world.item.crafting.Recipe;
 import net.minecraft.world.item.crafting.RecipeType;
 import net.minecraft.world.level.Level;
 import net.minecraftforge.common.ForgeHooks;
-import net.minecraftforge.fmllegacy.hooks.BasicEventHooks;
+import net.minecraftforge.event.ForgeEventFactory;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -91,7 +91,7 @@ public class TurtleInventoryCrafting extends CraftingContainer
             results.add( result );
 
             result.onCraftedBy( world, player, result.getCount() );
-            BasicEventHooks.firePlayerCraftingEvent( player, result, this );
+            ForgeEventFactory.firePlayerCraftingEvent( player, result, this );
 
             ForgeHooks.setCraftingPlayer( player );
             NonNullList<ItemStack> remainders = recipe.getRemainingItems( this );

src/main/java/dan200/computercraft/shared/turtle/upgrades/TurtleTool.java

@@ -255,7 +255,7 @@ public class TurtleTool extends AbstractTurtleUpgrade
 
         // Destroy the block
         boolean canHarvest = state.canHarvestBlock( world, blockPosition, turtlePlayer );
-        boolean canBreak = state.removedByPlayer( world, blockPosition, turtlePlayer, canHarvest, fluidState );
+        boolean canBreak = state.onDestroyedByPlayer( world, blockPosition, turtlePlayer, canHarvest, fluidState );
         if( canBreak ) state.getBlock().destroy( world, blockPosition, state );
         if( canHarvest && canBreak )
         {

src/main/java/dan200/computercraft/shared/util/IDAssigner.java

@@ -11,7 +11,7 @@ import com.google.gson.reflect.TypeToken;
 import dan200.computercraft.ComputerCraft;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.world.level.storage.LevelResource;
-import net.minecraftforge.fmllegacy.server.ServerLifecycleHooks;
+import net.minecraftforge.server.ServerLifecycleHooks;
 
 import java.io.File;
 import java.io.Reader;

src/main/java/dan200/computercraft/shared/util/TickScheduler.java

@@ -10,7 +10,8 @@ import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.shared.common.TileGeneric;
 import net.minecraft.core.BlockPos;
 import net.minecraft.world.level.Level;
-import net.minecraft.world.level.TickList;
+import net.minecraft.world.level.LevelAccessor;
+import net.minecraft.world.level.block.Block;
 import net.minecraft.world.level.block.entity.BlockEntity;
 import net.minecraftforge.event.TickEvent;
 import net.minecraftforge.eventbus.api.SubscribeEvent;
@@ -21,7 +22,7 @@ import java.util.Iterator;
 import java.util.Set;
 
 /**
- * A thread-safe version of {@link TickList#scheduleTick(BlockPos, Object, int)}.
+ * A thread-safe version of {@link LevelAccessor#scheduleTick(BlockPos, Block, int)}.
  *
  * We use this when modems and other peripherals change a block in a different thread.
  */
@@ -58,9 +59,9 @@ public final class TickScheduler
             Level world = tile.getLevel();
             BlockPos pos = tile.getBlockPos();
 
-            if( world != null && pos != null && world.isAreaLoaded( pos, 0 ) && world.getBlockEntity( pos ) == tile )
+            if( world != null && pos != null && world.isLoaded( pos ) && world.getBlockEntity( pos ) == tile )
             {
-                world.getBlockTicks().scheduleTick( pos, tile.getBlockState().getBlock(), 0 );
+                world.scheduleTick( pos, tile.getBlockState().getBlock(), 0 );
             }
         }
     }

src/main/java/dan200/computercraft/shared/util/WaterloggableHelpers.java

@@ -48,7 +48,7 @@ public final class WaterloggableHelpers
     {
         if( state.getValue( WATERLOGGED ) )
         {
-            world.getLiquidTicks().scheduleTick( pos, Fluids.WATER, Fluids.WATER.getTickDelay( world ) );
+            world.scheduleTick( pos, Fluids.WATER, Fluids.WATER.getTickDelay( world ) );
         }
     }
 

src/main/resources/META-INF/mods.toml

@@ -1,5 +1,5 @@
 modLoader="javafml"
-loaderVersion="[37,38)"
+loaderVersion="[39,40)"
 
 issueTrackerURL="https://github.com/cc-tweaked/CC-Tweaked/issues"
 logoFile="pack.png"
@@ -21,6 +21,6 @@ CC: Tweaked is a fork of ComputerCraft, adding programmable computers, turtles a
 [[dependencies.computercraft]]
     modId="forge"
     mandatory=true
-    versionRange="[37.0.85,38)"
+    versionRange="[39.0.0,40)"
     ordering="NONE"
     side="BOTH"

src/main/resources/data/computercraft/lua/rom/apis/peripheral.lua

@@ -28,9 +28,11 @@ Once you have the name of a peripheral, you can call functions on it using the
 @{peripheral.call} function. This takes the name of our peripheral, the name of
 the function we want to call, and then its arguments.
 
-> Some bits of the peripheral API call peripheral functions *methods* instead
-> (for example, the @{peripheral.getMethods} function). Don't worry, they're the
-> same thing!
+:::info
+Some bits of the peripheral API call peripheral functions *methods* instead
+(for example, the @{peripheral.getMethods} function). Don't worry, they're the
+same thing!
+:::
 
 Let's say we have a monitor above our computer (and so "top") and want to
 @{monitor.write|write some text to it}. We'd write the following:

src/main/resources/data/computercraft/lua/rom/help/changelog.md

@@ -1,3 +1,14 @@
+# New features in CC: Tweaked 1.99.1
+
+* Add package.searchpath to the cc.require API. (MCJack123)
+* Provide a more efficient way for the Java API to consume Lua tables in certain restricted cases.
+
+Several bug fixes:
+* Fix keys being "sticky" when opening the off-hand pocket computer GUI.
+* Correctly handle broken coroutine managers resuming Java code with a `nil` event.
+* Prevent computer buttons stealing focus from the terminal.
+* Fix a class cast exception when a monitor is malformed in ways I do not quite understand.
+
 # New features in CC: Tweaked 1.99.0
 
 * Pocket computers in their offhand will open without showing a terminal. You can look around and interact with the world, but your keyboard will be forwarded to the computer. (Wojbie, MagGen-hub).

src/main/resources/data/computercraft/lua/rom/help/whatsnew.md

@@ -1,32 +1,12 @@
-New features in CC: Tweaked 1.99.0
+New features in CC: Tweaked 1.99.1
 
-* Pocket computers in their offhand will open without showing a terminal. You can look around and interact with the world, but your keyboard will be forwarded to the computer. (Wojbie, MagGen-hub).
-* Peripherals can now have multiple types. `peripheral.getType` now returns multiple values, and `peripheral.hasType` checks if a peripheral has a specific type.
-* Add several missing keys to the `keys` table. (ralphgod3)
-* Add feature introduction/changed version information to the documentation. (MCJack123)
-* Increase the file upload limit to 512KiB.
-* Rednet can now handle computer IDs larger than 65535. (Ale32bit)
-* Optimise deduplication of rednet messages (MCJack123)
-* Make `term.blit` colours case insensitive. (Ocawesome101)
-* Add a new `about` program for easier version identification. (MCJack123)
-* Optimise peripheral calls in `rednet.run`. (xAnavrins)
-* Add dimension parameter to `commands.getBlockInfo`.
-* Add `cc.pretty.pretty_print` helper function (Lupus590).
-* Add back JEI integration.
-* Turtle and pocket computer upgrades can now be added and modified with data packs.
-* Various translation updates (MORIMORI3017, Ale2Bit, mindy15963)
+* Add package.searchpath to the cc.require API. (MCJack123)
+* Provide a more efficient way for the Java API to consume Lua tables in certain restricted cases.
 
-And several bug fixes:
-* Fix various computer commands failing when OP level was 4.
-* Various documentation fixes. (xXTurnerLP, MCJack123)
-* Fix `textutils.serialize` not serialising infinity and nan values. (Wojbie)
-* Wired modems now correctly clean up mounts when a peripheral is detached.
-* Fix incorrect turtle and pocket computer upgrade recipes in the recipe book.
-* Fix speakers not playing sounds added via resource packs which are not registered in-game.
-* Fix speaker upgrades sending packets after the server has stopped.
-* Monitor sizing has been rewritten, hopefully making it more stable.
-* Peripherals are now invalidated when the computer ticks, rather than when the peripheral changes.
-* Fix printouts and pocket computers rendering at fullbright when in item frames.
-* All mod blocks now have an effective tool (pickaxe).
+Several bug fixes:
+* Fix keys being "sticky" when opening the off-hand pocket computer GUI.
+* Correctly handle broken coroutine managers resuming Java code with a `nil` event.
+* Prevent computer buttons stealing focus from the terminal.
+* Fix a class cast exception when a monitor is malformed in ways I do not quite understand.
 
 Type "help changelog" to see the full version history.

src/main/resources/data/computercraft/lua/rom/modules/main/cc/require.lua

@@ -31,22 +31,37 @@ local function preload(package)
     end
 end
 
-local function from_file(package, env, dir)
+local function from_file(package, env)
     return function(name)
-        local fname = string.gsub(name, "%.", "/")
+        local sPath, sError = package.searchpath(name, package.path)
+        if not sPath then
+            return nil, sError
+        end
+        local fnFile, sError = loadfile(sPath, nil, env)
+        if fnFile then
+            return fnFile, sPath
+        else
+            return nil, sError
+        end
+    end
+end
+
+local function make_searchpath(dir)
+    return function(name, path, sep, rep)
+        expect(1, name, "string")
+        expect(2, path, "string")
+        sep = expect(3, sep, "string", "nil") or "."
+        rep = expect(4, rep, "string", "nil") or "/"
+
+        local fname = string.gsub(name, sep:gsub("%.", "%%%."), rep)
         local sError = ""
-        for pattern in string.gmatch(package.path, "[^;]+") do
+        for pattern in string.gmatch(path, "[^;]+") do
             local sPath = string.gsub(pattern, "%?", fname)
             if sPath:sub(1, 1) ~= "/" then
                 sPath = fs.combine(dir, sPath)
             end
             if fs.exists(sPath) and not fs.isDir(sPath) then
-                local fnFile, sError = loadfile(sPath, nil, env)
-                if fnFile then
-                    return fnFile, sPath
-                else
-                    return nil, sError
-                end
+                return sPath
             else
                 if #sError > 0 then
                     sError = sError .. "\n  "
@@ -118,7 +133,8 @@ local function make_package(env, dir)
     end
     package.config = "/\n;\n?\n!\n-"
     package.preload = {}
-    package.loaders = { preload(package), from_file(package, env, dir) }
+    package.loaders = { preload(package), from_file(package, env) }
+    package.searchpath = make_searchpath(dir)
 
     return make_require(package), package
 end

src/test/java/dan200/computercraft/core/ComputerTestDelegate.java

@@ -97,7 +97,7 @@ public class ComputerTestDelegate
 
         if( REPORT_PATH.delete() ) ComputerCraft.log.info( "Deleted previous coverage report." );
 
-        Terminal term = new Terminal( 80, 30 );
+        Terminal term = new Terminal( 80, 100 );
         IWritableMount mount = new FileMount( new File( "test-files/mount" ), 10_000_000 );
 
         // Remove any existing files

src/test/java/dan200/computercraft/core/asm/GeneratorTest.java

@@ -120,6 +120,13 @@ public class GeneratorTest
             contramap( notNullValue(), "callback", MethodResult::getCallback ) );
     }
 
+    @Test
+    public void testUnsafe()
+    {
+        List<NamedMethod<LuaMethod>> methods = LuaMethod.GENERATOR.getMethods( Unsafe.class );
+        assertThat( methods, contains( named( "withUnsafe" ) ) );
+    }
+
     public static class Basic
     {
         @LuaFunction
@@ -222,6 +229,21 @@ public class GeneratorTest
         {}
     }
 
+    public static class Unsafe
+    {
+        @LuaFunction( unsafe = true )
+        public final void withUnsafe( LuaTable<?, ?> table )
+        {}
+
+        @LuaFunction
+        public final void withoutUnsafe( LuaTable<?, ?> table )
+        {}
+
+        @LuaFunction( unsafe = true, mainThread = true )
+        public final void invalid( LuaTable<?, ?> table )
+        {}
+    }
+
     private static <T> T find( Collection<NamedMethod<T>> methods, String name )
     {
         return methods.stream()

src/testMod/java/dan200/computercraft/ingame/mod/ClientHooks.java

@@ -27,7 +27,7 @@ import net.minecraft.world.level.levelgen.WorldGenSettings;
 import net.minecraft.world.level.levelgen.flat.FlatLayerInfo;
 import net.minecraft.world.level.levelgen.flat.FlatLevelGeneratorSettings;
 import net.minecraftforge.api.distmarker.Dist;
-import net.minecraftforge.client.event.GuiScreenEvent;
+import net.minecraftforge.client.event.ScreenEvent;
 import net.minecraftforge.eventbus.api.SubscribeEvent;
 import net.minecraftforge.fml.common.Mod;
 import org.apache.logging.log4j.LogManager;
@@ -50,9 +50,9 @@ public final class ClientHooks
     }
 
     @SubscribeEvent
-    public static void onGuiInit( GuiScreenEvent.InitGuiEvent event )
+    public static void onGuiInit( ScreenEvent.InitScreenEvent event )
     {
-        if( triggered || !(event.getGui() instanceof TitleScreen) ) return;
+        if( triggered || !(event.getScreen() instanceof TitleScreen) ) return;
         triggered = true;
 
         ClientHooks.openWorld();
@@ -93,7 +93,7 @@ public final class ClientHooks
 
             WorldGenSettings generator = new WorldGenSettings( 0, false, false, withOverworld(
                 dimensions,
-                DimensionType.defaultDimensions( dimensions, biomes, registries.registryOrThrow( Registry.NOISE_GENERATOR_SETTINGS_REGISTRY ), 0 ),
+                DimensionType.defaultDimensions( registries, 0 ),
                 new FlatLevelSource( flatSettings )
             ) );
 

src/testMod/java/dan200/computercraft/ingame/mod/TestHooks.java

@@ -5,9 +5,9 @@
  */
 package dan200.computercraft.ingame.mod;
 
+import dan200.computercraft.ingame.api.Times;
 import net.minecraft.ChatFormatting;
 import net.minecraft.SharedConstants;
-import dan200.computercraft.ingame.api.Times;
 import net.minecraft.client.Minecraft;
 import net.minecraft.commands.CommandSourceStack;
 import net.minecraft.core.BlockPos;
@@ -21,11 +21,11 @@ import net.minecraft.world.level.block.Rotation;
 import net.minecraft.world.level.levelgen.Heightmap;
 import net.minecraftforge.event.RegisterCommandsEvent;
 import net.minecraftforge.event.TickEvent;
+import net.minecraftforge.event.server.ServerStartedEvent;
 import net.minecraftforge.eventbus.api.SubscribeEvent;
 import net.minecraftforge.fml.common.Mod;
 import net.minecraftforge.fml.loading.FMLLoader;
-import net.minecraftforge.fmllegacy.server.ServerLifecycleHooks;
-import net.minecraftforge.fmlserverevents.FMLServerStartedEvent;
+import net.minecraftforge.server.ServerLifecycleHooks;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
@@ -49,7 +49,7 @@ public class TestHooks
     }
 
     @SubscribeEvent
-    public static void onServerStarted( FMLServerStartedEvent event )
+    public static void onServerStarted( ServerStartedEvent event )
     {
         MinecraftServer server = event.getServer();
         GameRules rules = server.getGameRules();