Remove QuadEmitter

And remove EMI support. I'm not sure it survived the 1.21.4 recipe
changes :(.

buildSrc/build.gradle.kts

@@ -25,6 +25,7 @@ repositories {
         name = "Fabric"
         content {
             includeGroup("net.fabricmc")
+            includeGroup("net.fabricmc.unpick")
         }
     }
 

buildSrc/src/main/kotlin/cc-tweaked.fabric.gradle.kts

@@ -68,5 +68,5 @@ tasks.ideaSyncTask {
 tasks.named("checkDependencyConsistency", DependencyCheck::class.java) {
     val libs = project.extensions.getByType<VersionCatalogsExtension>().named("libs")
     // Minecraft depends on asm, but Fabric forces it to a more recent version
-    override(libs.findLibrary("asm").get(), "9.8")
+    override(libs.findLibrary("asm").get(), "9.9")
 }

buildSrc/src/main/kotlin/cc-tweaked.java-convention.gradle.kts

@@ -50,7 +50,6 @@ repositories {
             includeGroup("com.simibubi.create")
             includeGroup("net.commoble.morered")
             includeGroup("dev.architectury")
-            includeGroup("dev.emi")
             includeGroup("maven.modrinth")
             includeGroup("me.shedaniel.cloth")
             includeGroup("me.shedaniel")

gradle.properties

@@ -15,4 +15,4 @@ isUnstable=true
 modVersion=1.116.1
 
 # Minecraft properties: We want to configure this here so we can read it in settings.gradle
-mcVersion=1.21.7
+mcVersion=1.21.10

gradle/libs.versions.toml

@@ -7,14 +7,14 @@
 # Minecraft
 # MC version is specified in gradle.properties, as we need that in settings.gradle.
 # Remember to update corresponding versions in fabric.mod.json/neoforge.mods.toml
-fabric-api = "0.128.0+1.21.7"
+fabric-api = "0.135.0+1.21.10"
-fabric-loader = "0.16.14"
+fabric-loader = "0.17.3"
-neoForge = "21.7.19-beta"
+neoForge = "21.10.6-beta"
 neoMergeTool = "2.0.0"
 mixin = "0.8.5"
-parchment = "2025.06.29"
+parchment = "2025.10.12"
-parchmentMc = "1.21.6"
+parchmentMc = "1.21.10"
-yarn = "1.21.7+build.1"
+yarn = "1.21.10+build.2"
 
 # Core dependencies (these versions are tied to the version Minecraft uses)
 fastutil = "8.5.15"
@@ -36,12 +36,11 @@ kotlin-coroutines = "1.10.1"
 nightConfig = "3.8.1"
 
 # Minecraft mods
-emi = "1.1.7+1.21"
 fabricPermissions = "0.3.3"
 iris-fabric = "1.9.1+1.21.7-fabric"
 iris-forge = "1.9.1+1.21.7-neoforge"
-jei = "23.1.0.4"
+jei = "26.0.0.1"
-modmenu = "13.0.2"
+modmenu = "16.0.0-rc.1"
 moreRed = "6.0.0.3"
 rei = "18.0.800"
 sodium-fabric = "mc1.21.6-0.6.13-fabric"
@@ -62,20 +61,20 @@ cctJavadoc = "1.8.5"
 checkstyle = "10.23.1"
 errorProne-core = "2.38.0"
 errorProne-plugin = "4.1.0"
-fabric-loom = "1.10.4"
+fabric-loom = "1.11.8"
 githubRelease = "2.5.2"
 gradleVersions = "0.50.0"
 ideaExt = "1.1.7"
 illuaminate = "0.1.0-83-g1131f68"
 lwjgl = "3.3.3"
 minotaur = "2.8.7"
-modDevGradle = "2.0.99"
+modDevGradle = "2.0.113"
 nullAway = "0.12.7"
 shadow = "8.3.1"
 spotless = "7.0.2"
 taskTree = "2.1.1"
 teavm = "0.13.0-SQUID.1"
-vanillaExtract = "0.2.1"
+vanillaExtract = "0.3.0"
 versionCatalogUpdate = "0.8.1"
 
 [libraries]
@@ -106,16 +105,15 @@ slf4j = { module = "org.slf4j:slf4j-api", version.ref = "slf4j" }
 # Minecraft mods
 create-fabric = { module = "com.simibubi.create:create-fabric-1.20.1", version.ref = "create-fabric" }
 create-forge = { module = "com.simibubi.create:create-1.21.1", version.ref = "create-forge" }
-emi = { module = "dev.emi:emi-xplat-mojmap", version.ref = "emi" }
 fabric-api = { module = "net.fabricmc.fabric-api:fabric-api", version.ref = "fabric-api" }
 fabric-junit = { module = "net.fabricmc:fabric-loader-junit", version.ref = "fabric-loader" }
 fabric-loader = { module = "net.fabricmc:fabric-loader", version.ref = "fabric-loader" }
 fabricPermissions = { module = "me.lucko:fabric-permissions-api", version.ref = "fabricPermissions" }
 iris-fabric = { module = "maven.modrinth:iris", version.ref = "iris-fabric" }
 iris-forge = { module = "maven.modrinth:iris", version.ref = "iris-forge" }
-jei-api = { module = "mezz.jei:jei-1.21.7-common-api", version.ref = "jei" }
+jei-api = { module = "mezz.jei:jei-1.21.10-common-api", version.ref = "jei" }
-jei-fabric = { module = "mezz.jei:jei-1.21.7-fabric", version.ref = "jei" }
+jei-fabric = { module = "mezz.jei:jei-1.21.10-fabric", version.ref = "jei" }
-jei-forge = { module = "mezz.jei:jei-1.21.7-neoforge", version.ref = "jei" }
+jei-forge = { module = "mezz.jei:jei-1.21.10-neoforge", version.ref = "jei" }
 mixin = { module = "org.spongepowered:mixin", version.ref = "mixin" }
 mixinExtra = { module = "io.github.llamalad7:mixinextras-common", version.ref = "mixinExtra" }
 modmenu = { module = "com.terraformersmc:modmenu", version.ref = "modmenu" }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.12-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.3-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

gradlew

@@ -114,7 +114,7 @@ case "$( uname )" in                #(
   NONSTOP* )        nonstop=true ;;
 esac
 
-CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+CLASSPATH="\\\"\\\""
 
 
 # Determine the Java command to use to start the JVM.
@@ -205,7 +205,7 @@ fi
 DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
 # Collect all arguments for the java command:
-#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
 #     and any embedded shellness will be escaped.
 #   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
 #     treated as '${Hostname}' itself on the command line.
@@ -213,7 +213,7 @@ DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 set -- \
         "-Dorg.gradle.appname=$APP_BASE_NAME" \
         -classpath "$CLASSPATH" \
-        org.gradle.wrapper.GradleWrapperMain \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
         "$@"
 
 # Stop when "xargs" is not available.

gradlew.bat

@@ -70,11 +70,11 @@ goto fail
 :execute
 @rem Setup the command line
 
-set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+set CLASSPATH=
 
 
 @rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
 
 :end
 @rem End local scope for the variables with windows NT shell

projects/common-api/src/client/java/dan200/computercraft/api/client/StandaloneModel.java

@@ -6,12 +6,15 @@ package dan200.computercraft.api.client;
 
 import com.google.common.base.Suppliers;
 import com.mojang.blaze3d.vertex.PoseStack;
+import com.mojang.blaze3d.vertex.SheetedDecalTextureGenerator;
+import com.mojang.blaze3d.vertex.VertexConsumer;
 import dan200.computercraft.api.client.turtle.TurtleUpgradeModel;
 import net.minecraft.client.multiplayer.ClientLevel;
-import net.minecraft.client.renderer.MultiBufferSource;
 import net.minecraft.client.renderer.RenderType;
 import net.minecraft.client.renderer.Sheets;
+import net.minecraft.client.renderer.SubmitNodeCollector;
 import net.minecraft.client.renderer.block.model.BakedQuad;
+import net.minecraft.client.renderer.feature.ModelFeatureRenderer;
 import net.minecraft.client.renderer.item.BlockModelWrapper;
 import net.minecraft.client.renderer.item.ItemModel;
 import net.minecraft.client.renderer.item.ItemModelResolver;
@@ -19,10 +22,11 @@ import net.minecraft.client.renderer.item.ItemStackRenderState;
 import net.minecraft.client.renderer.texture.TextureAtlasSprite;
 import net.minecraft.client.resources.model.BlockModelRotation;
 import net.minecraft.client.resources.model.ModelBaker;
+import net.minecraft.client.resources.model.ModelBakery;
 import net.minecraft.client.resources.model.ResolvedModel;
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.util.ARGB;
-import net.minecraft.world.entity.LivingEntity;
+import net.minecraft.world.entity.ItemOwner;
 import net.minecraft.world.item.ItemDisplayContext;
 import net.minecraft.world.item.ItemStack;
 import org.joml.Vector3f;
@@ -113,7 +117,7 @@ public final class StandaloneModel {
      * Set up an {@link ItemStackRenderState.LayerRenderState} to render this model.
      *
      * @param layer The layer to set up.
-     * @see ItemModel#update(ItemStackRenderState, ItemStack, ItemModelResolver, ItemDisplayContext, ClientLevel, LivingEntity, int)
+     * @see ItemModel#update(ItemStackRenderState, ItemStack, ItemModelResolver, ItemDisplayContext, ClientLevel, ItemOwner, int)
      */
     public void setupItemLayer(ItemStackRenderState.LayerRenderState layer) {
         layer.setExtents(extents);
@@ -127,26 +131,37 @@ public final class StandaloneModel {
      * Render the model directly.
      *
      * @param transform The current pose stack transformations.
-     * @param buffers   The buffer source to use for rendering.
+     * @param collector The node collector to render to.
      * @param light     The current light texture coordinate.
      * @param overlay   The current overlay texture coordinate.
      */
-    public void render(PoseStack transform, MultiBufferSource buffers, int light, int overlay) {
+    public void submit(PoseStack transform, SubmitNodeCollector collector, int light, int overlay) {
-        render(transform, buffers, light, overlay, null);
+        submit(transform, collector, light, overlay, null, null);
     }
 
     /**
      * Render the model directly.
      *
-     * @param transform The current pose stack transformations.
+     * @param transform        The current pose stack transformations.
-     * @param buffers   The buffer source to use for rendering.
+     * @param collector        The node collector to render to.
-     * @param light     The current light texture coordinate.
+     * @param light            The current light texture coordinate.
-     * @param overlay   The current overlay texture coordinate.
+     * @param overlay          The current overlay texture coordinate.
-     * @param tints     The tints for this model.
+     * @param tints            The tints for this model.
+     * @param crumblingOverlay The current breaking progress.
      */
-    public void render(PoseStack transform, MultiBufferSource buffers, int light, int overlay, int @Nullable [] tints) {
+    public void submit(PoseStack transform, SubmitNodeCollector collector, int light, int overlay, int @Nullable [] tints, ModelFeatureRenderer.@Nullable CrumblingOverlay crumblingOverlay) {
-        var pose = transform.last();
+        collector.submitCustomGeometry(transform, renderType, (pose, buffer) -> render(pose, buffer, tints, light, overlay));
-        var buffer = buffers.getBuffer(renderType);
+
+        if (crumblingOverlay != null && renderType.affectsCrumbling()) {
+            // FIXME: We need a custom hook here, which renders to crumblingBufferSource. Currently the DESTROY_TYPES
+            //  buffer gets flushed before the main model gets rendered.
+            collector.submitCustomGeometry(transform, ModelBakery.DESTROY_TYPES.get(crumblingOverlay.progress()), (pose, buffer) ->
+                render(pose, new SheetedDecalTextureGenerator(buffer, crumblingOverlay.cameraPose(), 1.0f), null, light, overlay)
+            );
+        }
+    }
+
+    private void render(PoseStack.Pose pose, VertexConsumer buffer, int @Nullable [] tints, int light, int overlay) {
         for (var quad : quads) {
             float r, g, b, a;
             var idx = quad.tintIndex();

projects/common-api/src/client/java/dan200/computercraft/api/client/turtle/BasicUpgradeModel.java

@@ -4,16 +4,13 @@
 
 package dan200.computercraft.api.client.turtle;
 
-import com.mojang.blaze3d.vertex.PoseStack;
 import com.mojang.serialization.MapCodec;
 import com.mojang.serialization.codecs.RecordCodecBuilder;
 import dan200.computercraft.api.ComputerCraftAPI;
 import dan200.computercraft.api.client.StandaloneModel;
-import dan200.computercraft.api.turtle.ITurtleAccess;
 import dan200.computercraft.api.turtle.ITurtleUpgrade;
 import dan200.computercraft.api.turtle.TurtleSide;
 import dan200.computercraft.api.upgrades.UpgradeData;
-import net.minecraft.client.renderer.MultiBufferSource;
 import net.minecraft.client.renderer.block.model.ItemTransform;
 import net.minecraft.client.renderer.item.BlockModelWrapper;
 import net.minecraft.client.renderer.item.ItemModelResolver;
@@ -70,11 +67,6 @@ public final class BasicUpgradeModel implements TurtleUpgradeModel {
         getModel(side).setupItemLayer(layer);
     }
 
-    @Override
-    public void renderForLevel(UpgradeData<ITurtleUpgrade> upgrade, TurtleSide side, ITurtleAccess turtle, PoseStack transform, MultiBufferSource buffers, int light, int overlay) {
-        getModel(side).render(transform, buffers, light, overlay);
-    }
-
     private record Unbaked(ResourceLocation left, ResourceLocation right) implements TurtleUpgradeModel.Unbaked {
         @Override
         public MapCodec<? extends TurtleUpgradeModel.Unbaked> type() {

projects/common-api/src/client/java/dan200/computercraft/api/client/turtle/ItemUpgradeModel.java

@@ -9,12 +9,10 @@ import com.mojang.math.Axis;
 import com.mojang.math.Transformation;
 import com.mojang.serialization.MapCodec;
 import dan200.computercraft.api.ComputerCraftAPI;
-import dan200.computercraft.api.turtle.ITurtleAccess;
 import dan200.computercraft.api.turtle.ITurtleUpgrade;
 import dan200.computercraft.api.turtle.TurtleSide;
 import dan200.computercraft.api.upgrades.UpgradeData;
-import net.minecraft.client.Minecraft;
+import net.minecraft.client.renderer.SubmitNodeCollector;
-import net.minecraft.client.renderer.MultiBufferSource;
 import net.minecraft.client.renderer.block.model.ItemTransform;
 import net.minecraft.client.renderer.item.ItemModelResolver;
 import net.minecraft.client.renderer.item.ItemStackRenderState;
@@ -23,7 +21,6 @@ import net.minecraft.client.renderer.special.SpecialModelRenderer;
 import net.minecraft.client.resources.model.ModelBaker;
 import net.minecraft.core.component.DataComponentPatch;
 import net.minecraft.resources.ResourceLocation;
-import net.minecraft.util.Mth;
 import net.minecraft.world.item.ItemDisplayContext;
 import net.minecraft.world.item.ItemStack;
 import org.joml.Matrix4f;
@@ -77,15 +74,6 @@ public final class ItemUpgradeModel implements TurtleUpgradeModel {
         }
     }
 
-    @Override
-    public void renderForLevel(UpgradeData<ITurtleUpgrade> upgrade, TurtleSide side, ITurtleAccess turtle, PoseStack transform, MultiBufferSource buffers, int light, int overlay) {
-        transform.mulPose(getRenderer(side).transform().getMatrix());
-        transform.mulPose(Axis.YP.rotation(Mth.PI));
-        Minecraft.getInstance().getItemRenderer().renderStatic(
-            upgrade.getUpgradeItem(), ItemDisplayContext.FIXED, light, overlay, transform, buffers, turtle.getLevel(), 0
-        );
-    }
-
     private static final class Unbaked implements TurtleUpgradeModel.Unbaked {
         @Override
         public MapCodec<? extends TurtleUpgradeModel.Unbaked> type() {
@@ -120,14 +108,14 @@ public final class ItemUpgradeModel implements TurtleUpgradeModel {
 
     private record TransformedRenderer(Transformation transform) implements SpecialModelRenderer<ItemStackRenderState> {
         @Override
-        public void render(
+        public void submit(
-            @Nullable ItemStackRenderState state, ItemDisplayContext itemDisplayContext, PoseStack poseStack,
+            @Nullable ItemStackRenderState state, ItemDisplayContext context, PoseStack poseStack, SubmitNodeCollector sink,
-            MultiBufferSource multiBufferSource, int overlay, int light, boolean bl
+            int light, int overlay, boolean foil, int outlineColour
         ) {
             if (state == null) return;
             poseStack.pushPose();
             poseStack.mulPose(transform.getMatrix());
-            state.render(poseStack, multiBufferSource, overlay, light);
+            state.submit(poseStack, sink, light, overlay, outlineColour);
             poseStack.popPose();
         }
 

projects/common-api/src/client/java/dan200/computercraft/api/client/turtle/SelectUpgradeModel.java

@@ -6,20 +6,17 @@ package dan200.computercraft.api.client.turtle;
 
 import com.google.common.collect.HashMultiset;
 import com.google.common.collect.Multiset;
-import com.mojang.blaze3d.vertex.PoseStack;
 import com.mojang.datafixers.util.Pair;
 import com.mojang.serialization.Codec;
 import com.mojang.serialization.DataResult;
 import com.mojang.serialization.MapCodec;
 import com.mojang.serialization.codecs.RecordCodecBuilder;
 import dan200.computercraft.api.ComputerCraftAPI;
-import dan200.computercraft.api.turtle.ITurtleAccess;
 import dan200.computercraft.api.turtle.ITurtleUpgrade;
 import dan200.computercraft.api.turtle.TurtleSide;
 import dan200.computercraft.api.upgrades.UpgradeData;
 import it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap;
 import net.minecraft.Util;
-import net.minecraft.client.renderer.MultiBufferSource;
 import net.minecraft.client.renderer.block.model.ItemTransform;
 import net.minecraft.client.renderer.item.ItemModelResolver;
 import net.minecraft.client.renderer.item.ItemStackRenderState;
@@ -71,11 +68,6 @@ public final class SelectUpgradeModel<T> implements TurtleUpgradeModel {
         getModel(upgrade).renderForItem(upgrade, side, renderer, resolver, transform, seed);
     }
 
-    @Override
-    public void renderForLevel(UpgradeData<ITurtleUpgrade> upgrade, TurtleSide side, ITurtleAccess turtle, PoseStack transform, MultiBufferSource buffers, int light, int overlay) {
-        getModel(upgrade).renderForLevel(upgrade, side, turtle, transform, buffers, light, overlay);
-    }
-
     private record Unbaked<T>(
         Cases<T> cases,
         Optional<TurtleUpgradeModel.Unbaked> fallback

projects/common-api/src/client/java/dan200/computercraft/api/client/turtle/TurtleUpgradeModel.java

@@ -4,24 +4,21 @@
 
 package dan200.computercraft.api.client.turtle;
 
-import com.mojang.blaze3d.vertex.PoseStack;
 import com.mojang.serialization.Codec;
 import com.mojang.serialization.MapCodec;
 import dan200.computercraft.api.ComputerCraftAPI;
-import dan200.computercraft.api.turtle.ITurtleAccess;
 import dan200.computercraft.api.turtle.ITurtleUpgrade;
 import dan200.computercraft.api.turtle.TurtleSide;
 import dan200.computercraft.api.upgrades.UpgradeData;
 import dan200.computercraft.impl.client.ComputerCraftAPIClientService;
 import net.minecraft.client.multiplayer.ClientLevel;
-import net.minecraft.client.renderer.MultiBufferSource;
 import net.minecraft.client.renderer.block.model.ItemTransform;
 import net.minecraft.client.renderer.item.ItemModel;
 import net.minecraft.client.renderer.item.ItemModelResolver;
 import net.minecraft.client.renderer.item.ItemStackRenderState;
 import net.minecraft.client.resources.model.ModelBaker;
 import net.minecraft.client.resources.model.ResolvableModel;
-import net.minecraft.world.entity.LivingEntity;
+import net.minecraft.world.entity.ItemOwner;
 import net.minecraft.world.item.ItemDisplayContext;
 import net.minecraft.world.item.ItemStack;
 
@@ -67,24 +64,10 @@ public interface TurtleUpgradeModel {
      * @param resolver  The model resolver.
      * @param transform The root model's transformation.
      * @param seed      The current model seed.
-     * @see ItemModel#update(ItemStackRenderState, ItemStack, ItemModelResolver, ItemDisplayContext, ClientLevel, LivingEntity, int)
+     * @see ItemModel#update(ItemStackRenderState, ItemStack, ItemModelResolver, ItemDisplayContext, ClientLevel, ItemOwner, int)
      */
     void renderForItem(UpgradeData<ITurtleUpgrade> upgrade, TurtleSide side, ItemStackRenderState renderer, ItemModelResolver resolver, ItemTransform transform, int seed);
 
-    /**
-     * Render this upgrade to a {@link MultiBufferSource}. This is used for rendering the block-entity form of the
-     * upgrade.
-     *
-     * @param upgrade   The upgrade being rendered.
-     * @param side      Which side of the turtle (left or right) the upgrade is equipped on.
-     * @param turtle    Access to the turtle that the upgrade resides on.
-     * @param transform The current pose stack.
-     * @param buffers   The buffers to render to.
-     * @param light     The lightmap coordinate.
-     * @param overlay   The overlay coordinate.
-     */
-    void renderForLevel(UpgradeData<ITurtleUpgrade> upgrade, TurtleSide side, ITurtleAccess turtle, PoseStack transform, MultiBufferSource buffers, int light, int overlay);
-
     /**
      * An unbaked turtle model. Much like other unbaked models (e.g. {@link ItemModel.Unbaked}), this should resolve
      * any dependencies and returned the fully-resolved model.

projects/common/build.gradle.kts

@@ -11,12 +11,6 @@ plugins {
     id("cc-tweaked.publishing")
 }
 
-sourceSets.client {
-    java {
-        exclude("dan200/computercraft/client/integration/emi")
-    }
-}
-
 minecraft {
     accessWideners(
         "src/main/resources/computercraft.accesswidener",
@@ -45,7 +39,6 @@ dependencies {
     compileOnly(libs.mixin)
     compileOnly(libs.mixinExtra)
     compileOnly(libs.bundles.externalMods.common)
-    clientCompileOnly(variantOf(libs.emi) { classifier("api") })
 
     annotationProcessorEverywhere(libs.autoService)
     testFixturesAnnotationProcessor(libs.autoService)

projects/common/src/client/java/dan200/computercraft/client/ClientHooks.java

@@ -7,7 +7,6 @@ package dan200.computercraft.client;
 import com.mojang.blaze3d.audio.Channel;
 import com.mojang.blaze3d.vertex.PoseStack;
 import com.mojang.math.Axis;
-import dan200.computercraft.api.turtle.TurtleSide;
 import dan200.computercraft.client.pocket.ClientPocketComputers;
 import dan200.computercraft.client.render.CableHighlightRenderer;
 import dan200.computercraft.client.render.ExtendedItemFrameRenderState;
@@ -22,14 +21,13 @@ import dan200.computercraft.shared.media.items.PrintoutItem;
 import dan200.computercraft.shared.peripheral.modem.wired.CableBlock;
 import dan200.computercraft.shared.peripheral.modem.wired.CableModemVariant;
 import dan200.computercraft.shared.peripheral.modem.wired.CableShapes;
-import dan200.computercraft.shared.peripheral.monitor.MonitorBlockEntity;
 import dan200.computercraft.shared.pocket.items.PocketComputerItem;
-import dan200.computercraft.shared.turtle.blocks.TurtleBlockEntity;
 import dan200.computercraft.shared.util.PauseAwareTimer;
 import dan200.computercraft.shared.util.WorldUtil;
 import net.minecraft.client.Camera;
 import net.minecraft.client.Minecraft;
 import net.minecraft.client.renderer.MultiBufferSource;
+import net.minecraft.client.renderer.SubmitNodeCollector;
 import net.minecraft.client.renderer.entity.state.ItemFrameRenderState;
 import net.minecraft.client.sounds.AudioStream;
 import net.minecraft.client.sounds.SoundEngine;
@@ -40,8 +38,6 @@ import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.phys.BlockHitResult;
 import net.minecraft.world.phys.HitResult;
 
-import java.util.function.Consumer;
-
 /**
  * Event listeners for client-only code.
  * <p>
@@ -71,30 +67,31 @@ public final class ClientHooks {
     }
 
     public static boolean drawHighlight(PoseStack transform, MultiBufferSource bufferSource, Camera camera, BlockHitResult hit) {
+        // TODO: Reconsider this API once https://github.com/FabricMC/fabric/pull/4906/ is merged.
         return CableHighlightRenderer.drawHighlight(transform, bufferSource, camera, hit)
             || MonitorHighlightRenderer.drawHighlight(transform, bufferSource, camera, hit);
     }
 
     public static boolean onRenderHeldItem(
-        PoseStack transform, MultiBufferSource render, int lightTexture, InteractionHand hand,
+        PoseStack transform, SubmitNodeCollector collector, int lightTexture, InteractionHand hand,
         float pitch, float equipProgress, float swingProgress, ItemStack stack
     ) {
         if (stack.getItem() instanceof PocketComputerItem) {
-            PocketItemRenderer.INSTANCE.renderItemFirstPerson(transform, render, lightTexture, hand, pitch, equipProgress, swingProgress, stack);
+            PocketItemRenderer.INSTANCE.renderItemFirstPerson(transform, collector, lightTexture, hand, pitch, equipProgress, swingProgress, stack);
             return true;
         }
         if (stack.getItem() instanceof PrintoutItem) {
-            PrintoutItemRenderer.INSTANCE.renderItemFirstPerson(transform, render, lightTexture, hand, pitch, equipProgress, swingProgress, stack);
+            PrintoutItemRenderer.INSTANCE.renderItemFirstPerson(transform, collector, lightTexture, hand, pitch, equipProgress, swingProgress, stack);
             return true;
         }
 
         return false;
     }
 
-    public static boolean onRenderItemFrame(PoseStack transform, MultiBufferSource render, ItemFrameRenderState frame, ExtendedItemFrameRenderState state, int light) {
+    public static boolean onRenderItemFrame(PoseStack transform, SubmitNodeCollector render, ItemFrameRenderState frame, ExtendedItemFrameRenderState state) {
         if (state.printoutData != null) {
             transform.mulPose(Axis.ZP.rotationDegrees(frame.rotation * 360.0f / 8.0f));
-            PrintoutItemRenderer.onRenderInFrame(transform, render, frame, state.printoutData, state.isBook, light);
+            PrintoutItemRenderer.onRenderInFrame(transform, render, frame, state.printoutData, state.isBook);
             return true;
         }
 
@@ -105,37 +102,6 @@ public final class ClientHooks {
         SpeakerManager.onPlayStreaming(engine, channel, stream);
     }
 
-    /**
-     * Add additional information about the currently targeted block to the debug screen.
-     *
-     * @param addText A callback which adds a single line of text.
-     */
-    public static void addBlockDebugInfo(Consumer<String> addText) {
-        var minecraft = Minecraft.getInstance();
-        if (!minecraft.getDebugOverlay().showDebugScreen() || minecraft.level == null) return;
-        if (minecraft.hitResult == null || minecraft.hitResult.getType() != HitResult.Type.BLOCK) return;
-
-        var tile = minecraft.level.getBlockEntity(((BlockHitResult) minecraft.hitResult).getBlockPos());
-
-        if (tile instanceof MonitorBlockEntity monitor) {
-            addText.accept("");
-            addText.accept(
-                String.format("Targeted monitor: (%d, %d), %d x %d", monitor.getXIndex(), monitor.getYIndex(), monitor.getWidth(), monitor.getHeight())
-            );
-        } else if (tile instanceof TurtleBlockEntity turtle) {
-            addText.accept("");
-            addText.accept("Targeted turtle:");
-            addText.accept(String.format("Id: %d", turtle.getComputerID()));
-            addTurtleUpgrade(addText, turtle, TurtleSide.LEFT);
-            addTurtleUpgrade(addText, turtle, TurtleSide.RIGHT);
-        }
-    }
-
-    private static void addTurtleUpgrade(Consumer<String> out, TurtleBlockEntity turtle, TurtleSide side) {
-        var upgrade = turtle.getAccess().getUpgradeWithData(side);
-        if (upgrade != null) out.accept(String.format("Upgrade[%s]: %s", side, upgrade.holder().key().location()));
-    }
-
     public static BlockState getBlockBreakingState(BlockState state, BlockPos pos) {
         // Only apply to cables which have both a cable and modem
         if (state.getBlock() != ModRegistry.Blocks.CABLE.get()

projects/common/src/client/java/dan200/computercraft/client/ClientRegistry.java

@@ -12,6 +12,9 @@ import dan200.computercraft.client.item.colour.PocketComputerLight;
 import dan200.computercraft.client.item.model.TurtleOverlayModel;
 import dan200.computercraft.client.item.properties.PocketComputerStateProperty;
 import dan200.computercraft.client.item.properties.TurtleShowElfOverlay;
+import dan200.computercraft.client.model.LecternBookModel;
+import dan200.computercraft.client.model.LecternPocketModel;
+import dan200.computercraft.client.model.LecternPrintoutModel;
 import dan200.computercraft.client.platform.ClientPlatformHelper;
 import dan200.computercraft.client.platform.ModelKey;
 import dan200.computercraft.client.render.CustomLecternRenderer;
@@ -23,11 +26,14 @@ import dan200.computercraft.client.turtle.TurtleUpgradeModelManager;
 import dan200.computercraft.shared.ModRegistry;
 import dan200.computercraft.shared.computer.inventory.AbstractComputerMenu;
 import net.minecraft.client.color.item.ItemTintSource;
+import net.minecraft.client.gui.components.debug.DebugScreenEntry;
 import net.minecraft.client.gui.render.pip.PictureInPictureRenderer;
 import net.minecraft.client.gui.render.state.pip.PictureInPictureRenderState;
 import net.minecraft.client.gui.screens.MenuScreens;
 import net.minecraft.client.gui.screens.Screen;
 import net.minecraft.client.gui.screens.inventory.MenuAccess;
+import net.minecraft.client.model.geom.ModelLayerLocation;
+import net.minecraft.client.model.geom.builders.LayerDefinition;
 import net.minecraft.client.renderer.MultiBufferSource;
 import net.minecraft.client.renderer.blockentity.BlockEntityRendererProvider;
 import net.minecraft.client.renderer.blockentity.BlockEntityRenderers;
@@ -51,6 +57,7 @@ import java.util.concurrent.Executor;
 import java.util.function.BiConsumer;
 import java.util.function.BiFunction;
 import java.util.function.Function;
+import java.util.function.Supplier;
 
 /**
  * Registers client-side objects, such as {@link BlockEntityRendererProvider}s and
@@ -193,6 +200,12 @@ public final class ClientRegistry {
         register.accept(TurtleShowElfOverlay.ID, TurtleShowElfOverlay.CODEC);
     }
 
+    public static void registerLayerDefinitions(BiConsumer<ModelLayerLocation, Supplier<LayerDefinition>> register) {
+        register.accept(LecternBookModel.LAYER, LecternBookModel::createLayer);
+        register.accept(LecternPrintoutModel.LAYER, LecternPrintoutModel::createLayer);
+        register.accept(LecternPocketModel.LAYER, LecternPocketModel::createLayer);
+    }
+
     public interface RegisterPictureInPictureRenderer {
         <T extends PictureInPictureRenderState> void register(Class<T> state, Function<MultiBufferSource.BufferSource, PictureInPictureRenderer<T>> factory);
     }
@@ -200,4 +213,8 @@ public final class ClientRegistry {
     public static void registerPictureInPictureRenderers(RegisterPictureInPictureRenderer register) {
         register.register(PrintoutScreen.PrintoutRenderState.class, PrintoutScreen.PrintoutPictureRenderer::new);
     }
+
+    public static void registerDebugScreenEntries(BiConsumer<ResourceLocation, DebugScreenEntry> register) {
+        register.accept(LookingAtBlockEntityDebugEntry.ID, LookingAtBlockEntityDebugEntry.create());
+    }
 }

projects/common/src/client/java/dan200/computercraft/client/gui/AbstractComputerScreen.java

@@ -23,6 +23,8 @@ import net.minecraft.client.Minecraft;
 import net.minecraft.client.gui.GuiGraphics;
 import net.minecraft.client.gui.components.events.GuiEventListener;
 import net.minecraft.client.gui.screens.inventory.AbstractContainerScreen;
+import net.minecraft.client.input.KeyEvent;
+import net.minecraft.client.input.MouseButtonEvent;
 import net.minecraft.network.chat.Component;
 import net.minecraft.world.entity.player.Inventory;
 import net.minecraft.world.item.ItemStack;
@@ -105,24 +107,33 @@ public abstract class AbstractComputerScreen<T extends AbstractComputerMenu> ext
     }
 
     @Override
-    public boolean keyPressed(int key, int scancode, int modifiers) {
+    public boolean keyPressed(KeyEvent event) {
         // Forward the tab key to the terminal, rather than moving between controls.
-        if (key == GLFW.GLFW_KEY_TAB && getFocused() != null && getFocused() == terminal) {
+        if (event.key() == GLFW.GLFW_KEY_TAB && getFocused() != null && getFocused() == terminal) {
-            return getFocused().keyPressed(key, scancode, modifiers);
+            return getFocused().keyPressed(event);
         }
 
-        return super.keyPressed(key, scancode, modifiers);
+        return super.keyPressed(event);
     }
 
     @Override
-    public boolean mouseReleased(double x, double y, int button) {
+    public boolean mouseReleased(MouseButtonEvent event) {
         // Reimplement ContainerEventHandler.mouseReleased, as it's not called in vanilla (it is in Forge, but that
         // shouldn't matter).
         setDragging(false);
-        var child = getChildAt(x, y);
+        var child = getChildAt(event.x(), event.y());
-        if (child.isPresent() && child.get().mouseReleased(x, y, button)) return true;
+        if (child.isPresent() && child.get().mouseReleased(event)) return true;
 
-        return super.mouseReleased(x, y, button);
+        return super.mouseReleased(event);
+    }
+
+    @Override
+    public boolean mouseScrolled(double mouseX, double mouseY, double scrollX, double scrollY) {
+        // Reimplement ContainerEventHandler.mouseScrolled, as AbstractContainerScreen overrides it.
+        var child = getChildAt(mouseX, mouseY);
+        if (child.isPresent() && child.get().mouseScrolled(mouseX, mouseY, scrollX, scrollY)) return true;
+
+        return super.mouseScrolled(mouseX, mouseY, scrollX, scrollY);
     }
 
     @Override
@@ -132,8 +143,8 @@ public abstract class AbstractComputerScreen<T extends AbstractComputerMenu> ext
     }
 
     @Override
-    public boolean mouseClicked(double x, double y, int button) {
+    public boolean mouseClicked(MouseButtonEvent event, boolean doubleClick) {
-        var changed = super.mouseClicked(x, y, button);
+        var changed = super.mouseClicked(event, doubleClick);
         // 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);
@@ -141,9 +152,9 @@ public abstract class AbstractComputerScreen<T extends AbstractComputerMenu> ext
     }
 
     @Override
-    public boolean mouseDragged(double x, double y, int button, double deltaX, double deltaY) {
+    public boolean mouseDragged(MouseButtonEvent event, double deltaX, double deltaY) {
-        return (getFocused() != null && getFocused().mouseDragged(x, y, button, deltaX, deltaY))
+        return (getFocused() != null && getFocused().mouseDragged(event, deltaX, deltaY))
-            || super.mouseDragged(x, y, button, deltaX, deltaY);
+            || super.mouseDragged(event, deltaX, deltaY);
     }
 
     @Override

projects/common/src/client/java/dan200/computercraft/client/gui/LookingAtBlockEntityDebugEntry.java

@@ -0,0 +1,96 @@
+// SPDX-FileCopyrightText: 2025 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package dan200.computercraft.client.gui;
+
+import dan200.computercraft.api.ComputerCraftAPI;
+import dan200.computercraft.api.turtle.TurtleSide;
+import dan200.computercraft.shared.ModRegistry;
+import dan200.computercraft.shared.peripheral.monitor.MonitorBlockEntity;
+import dan200.computercraft.shared.turtle.blocks.TurtleBlockEntity;
+import net.minecraft.SharedConstants;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.gui.components.debug.DebugEntryLookingAtBlock;
+import net.minecraft.client.gui.components.debug.DebugScreenDisplayer;
+import net.minecraft.client.gui.components.debug.DebugScreenEntry;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.block.entity.BlockEntityType;
+import net.minecraft.world.level.chunk.LevelChunk;
+import net.minecraft.world.phys.BlockHitResult;
+import net.minecraft.world.phys.HitResult;
+import org.jspecify.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.function.BiConsumer;
+
+/**
+ * A {@link DebugScreenEntry} that provides information about the currently looked at block entity.
+ *
+ * @see DebugEntryLookingAtBlock
+ */
+public final class LookingAtBlockEntityDebugEntry implements DebugScreenEntry {
+    public static final ResourceLocation ID = ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "looking_at_block_entity");
+
+    private final Map<BlockEntityType<?>, BiConsumer<List<String>, BlockEntity>> blockEntityEmitters = new HashMap<>();
+
+    private LookingAtBlockEntityDebugEntry() {
+    }
+
+    @Override
+    public void display(DebugScreenDisplayer displayer, @Nullable Level level, @Nullable LevelChunk clientChunk, @Nullable LevelChunk serverChunk) {
+        var entity = Minecraft.getInstance().getCameraEntity();
+        var trueLevel = SharedConstants.DEBUG_SHOW_SERVER_DEBUG_VALUES ? level : Minecraft.getInstance().level;
+        if (entity == null || trueLevel == null) return;
+
+        var hitResult = entity.pick(20.0, 0.0F, false);
+        if (hitResult.getType() != HitResult.Type.BLOCK) return;
+
+        var blockEntity = trueLevel.getBlockEntity(((BlockHitResult) hitResult).getBlockPos());
+        if (blockEntity == null) return;
+        var emitter = blockEntityEmitters.get(blockEntity.getType());
+        if (emitter == null) return;
+
+        List<String> lines = new ArrayList<>();
+        emitter.accept(lines, blockEntity);
+        displayer.addToGroup(ID, lines);
+    }
+
+    @SuppressWarnings("unchecked")
+    private <T extends BlockEntity> LookingAtBlockEntityDebugEntry register(BlockEntityType<T> type, BiConsumer<List<String>, T> emit) {
+        blockEntityEmitters.put(type, (BiConsumer<List<String>, BlockEntity>) emit);
+        return this;
+    }
+
+    public static DebugScreenEntry create() {
+        return new LookingAtBlockEntityDebugEntry()
+            .register(ModRegistry.BlockEntities.MONITOR_NORMAL.get(), LookingAtBlockEntityDebugEntry::debugMonitor)
+            .register(ModRegistry.BlockEntities.MONITOR_ADVANCED.get(), LookingAtBlockEntityDebugEntry::debugMonitor)
+            .register(ModRegistry.BlockEntities.TURTLE_NORMAL.get(), LookingAtBlockEntityDebugEntry::debugTurtle)
+            .register(ModRegistry.BlockEntities.TURTLE_ADVANCED.get(), LookingAtBlockEntityDebugEntry::debugTurtle);
+    }
+
+    private static void debugMonitor(List<String> lines, MonitorBlockEntity monitor) {
+        lines.add(
+            String.format("Targeted monitor: (%d, %d), %d x %d", monitor.getXIndex(), monitor.getYIndex(), monitor.getWidth(), monitor.getHeight())
+        );
+    }
+
+    private static void debugTurtle(List<String> lines, TurtleBlockEntity turtle) {
+        lines.add("Targeted turtle:");
+        lines.add(String.format("Id: %d", turtle.getComputerID()));
+        addTurtleUpgrade(lines, turtle, TurtleSide.LEFT);
+        addTurtleUpgrade(lines, turtle, TurtleSide.RIGHT);
+    }
+
+    private static void addTurtleUpgrade(List<String> out, TurtleBlockEntity turtle, TurtleSide side) {
+        var upgrade = turtle.getAccess().getUpgradeWithData(side);
+        if (upgrade != null) out.add(String.format("Upgrade[%s]: %s", side, upgrade.holder().key().location()));
+    }
+
+}

projects/common/src/client/java/dan200/computercraft/client/gui/NoTermComputerScreen.java

@@ -14,6 +14,7 @@ import net.minecraft.client.ScrollWheelHandler;
 import net.minecraft.client.gui.GuiGraphics;
 import net.minecraft.client.gui.screens.Screen;
 import net.minecraft.client.gui.screens.inventory.MenuAccess;
+import net.minecraft.client.input.KeyEvent;
 import net.minecraft.network.chat.Component;
 import net.minecraft.world.entity.player.Inventory;
 import org.jspecify.annotations.Nullable;
@@ -91,13 +92,13 @@ public class NoTermComputerScreen<T extends AbstractComputerMenu> extends Screen
     }
 
     @Override
-    public final boolean keyPressed(int key, int scancode, int modifiers) {
+    public final boolean keyPressed(KeyEvent event) {
         // Forward the tab key to the terminal, rather than moving between controls.
-        if (key == GLFW.GLFW_KEY_TAB && getFocused() != null && getFocused() == terminal) {
+        if (event.key() == GLFW.GLFW_KEY_TAB && getFocused() != null && getFocused() == terminal) {
-            return getFocused().keyPressed(key, scancode, modifiers);
+            return getFocused().keyPressed(event);
         }
 
-        return super.keyPressed(key, scancode, modifiers);
+        return super.keyPressed(event);
     }
 
     @Override

projects/common/src/client/java/dan200/computercraft/client/gui/OptionScreen.java

@@ -96,7 +96,7 @@ public final class OptionScreen extends Screen {
         );
         graphics.blit(RenderPipelines.GUI_TEXTURED, BACKGROUND, x, y + innerHeight - PADDING, 0, 256 - PADDING, innerWidth, PADDING, 256, 256);
 
-        assertNonNull(messageRenderer).renderLeftAlignedNoShadow(graphics, x + PADDING, y + PADDING, FONT_HEIGHT, 0x404040);
+        assertNonNull(messageRenderer).render(graphics, MultiLineLabel.Align.LEFT, +PADDING, y + PADDING, FONT_HEIGHT, false, 0x404040);
         super.render(graphics, mouseX, mouseY, partialTicks);
     }
 

projects/common/src/client/java/dan200/computercraft/client/gui/PrintoutScreen.java

@@ -16,6 +16,7 @@ import net.minecraft.client.gui.render.pip.PictureInPictureRenderer;
 import net.minecraft.client.gui.render.state.GuiElementRenderState;
 import net.minecraft.client.gui.render.state.pip.PictureInPictureRenderState;
 import net.minecraft.client.gui.screens.inventory.AbstractContainerScreen;
+import net.minecraft.client.input.KeyEvent;
 import net.minecraft.client.renderer.LightTexture;
 import net.minecraft.client.renderer.MultiBufferSource;
 import net.minecraft.network.chat.Component;
@@ -87,18 +88,18 @@ public final class PrintoutScreen extends AbstractContainerScreen<PrintoutMenu>
     }
 
     @Override
-    public boolean keyPressed(int key, int scancode, int modifiers) {
+    public boolean keyPressed(KeyEvent event) {
-        if (key == GLFW.GLFW_KEY_RIGHT) {
+        if (event.key() == GLFW.GLFW_KEY_RIGHT) {
             nextPage();
             return true;
         }
 
-        if (key == GLFW.GLFW_KEY_LEFT) {
+        if (event.key() == GLFW.GLFW_KEY_LEFT) {
             previousPage();
             return true;
         }
 
-        return super.keyPressed(key, scancode, modifiers);
+        return super.keyPressed(event);
     }
 
     @Override
@@ -185,7 +186,9 @@ public final class PrintoutScreen extends AbstractContainerScreen<PrintoutMenu>
             pose.translate(-0.5f * X_SIZE, -(Y_SIZE + COVER_SIZE), 0);
             pose.scale(1.0f, 1.0f, -1.0f);
 
-            drawBorder(pose, bufferSource, 0, 0, 0, state.page(), state.printout().pages(), state.printout().book(), LightTexture.FULL_BRIGHT);
+            var buffer = bufferSource.getBuffer(PrintoutRenderer.BACKGROUND);
+            drawBorder(pose.last().pose(), buffer, 0, 0, 0, state.page(), state.printout().pages(), state.printout().book(), LightTexture.FULL_BRIGHT);
+
             drawText(
                 pose, bufferSource, X_TEXT_MARGIN, Y_TEXT_MARGIN, PrintoutData.LINES_PER_PAGE * state.page(), LightTexture.FULL_BRIGHT,
                 state.printout().text(), state.printout().colour()

projects/common/src/client/java/dan200/computercraft/client/gui/widgets/TerminalWidget.java

@@ -19,7 +19,9 @@ import net.minecraft.client.gui.narration.NarrationElementOutput;
 import net.minecraft.client.gui.navigation.ScreenRectangle;
 import net.minecraft.client.gui.render.TextureSetup;
 import net.minecraft.client.gui.render.state.GuiElementRenderState;
-import net.minecraft.client.gui.screens.Screen;
+import net.minecraft.client.input.CharacterEvent;
+import net.minecraft.client.input.KeyEvent;
+import net.minecraft.client.input.MouseButtonEvent;
 import net.minecraft.client.renderer.LightTexture;
 import net.minecraft.client.renderer.RenderPipelines;
 import net.minecraft.network.chat.Component;
@@ -78,22 +80,22 @@ public class TerminalWidget extends AbstractWidget {
     }
 
     @Override
-    public boolean charTyped(char ch, int modifiers) {
+    public boolean charTyped(CharacterEvent event) {
-        var terminalChar = StringUtil.unicodeToTerminal(ch);
+        var terminalChar = StringUtil.unicodeToTerminal(event.codepoint());
         if (StringUtil.isTypableChar(terminalChar)) computer.charTyped((byte) terminalChar);
         return true;
     }
 
     @Override
-    public boolean keyPressed(int key, int scancode, int modifiers) {
+    public boolean keyPressed(KeyEvent event) {
-        if (key == GLFW.GLFW_KEY_ESCAPE) return false;
+        if (event.key() == GLFW.GLFW_KEY_ESCAPE) return false;
-        if (Screen.isPaste(key)) {
+        if (event.isPaste()) {
             paste();
             return true;
         }
 
-        if ((modifiers & GLFW.GLFW_MOD_CONTROL) != 0) {
+        if ((event.modifiers() & GLFW.GLFW_MOD_CONTROL) != 0) {
-            switch (KeyConverter.physicalToActual(key, scancode)) {
+            switch (KeyConverter.physicalToActual(event.key(), event.scancode())) {
                 case GLFW.GLFW_KEY_T -> {
                     if (terminateTimer < 0) terminateTimer = 0;
                 }
@@ -106,11 +108,11 @@ public class TerminalWidget extends AbstractWidget {
             }
         }
 
-        if (key >= 0 && terminateTimer < KEY_SUPPRESS_DELAY && rebootTimer < KEY_SUPPRESS_DELAY && shutdownTimer < KEY_SUPPRESS_DELAY) {
+        if (event.key() >= 0 && terminateTimer < KEY_SUPPRESS_DELAY && rebootTimer < KEY_SUPPRESS_DELAY && shutdownTimer < KEY_SUPPRESS_DELAY) {
             // Queue the "key" event and add to the down set
-            var repeat = keysDown.get(key);
+            var repeat = keysDown.get(event.key());
-            keysDown.set(key);
+            keysDown.set(event.key());
-            computer.keyDown(key, repeat);
+            computer.keyDown(event.key(), repeat);
         }
 
         return true;
@@ -122,14 +124,14 @@ public class TerminalWidget extends AbstractWidget {
     }
 
     @Override
-    public boolean keyReleased(int key, int scancode, int modifiers) {
+    public boolean keyReleased(KeyEvent event) {
         // Queue the "key_up" event and remove from the down set
-        if (key >= 0 && keysDown.get(key)) {
+        if (event.key() >= 0 && keysDown.get(event.key())) {
-            keysDown.set(key, false);
+            keysDown.set(event.key(), false);
-            computer.keyUp(key);
+            computer.keyUp(event.key());
         }
 
-        switch (KeyConverter.physicalToActual(key, scancode)) {
+        switch (KeyConverter.physicalToActual(event.key(), event.scancode())) {
             case GLFW.GLFW_KEY_T -> terminateTimer = -1;
             case GLFW.GLFW_KEY_R -> rebootTimer = -1;
             case GLFW.GLFW_KEY_S -> shutdownTimer = -1;
@@ -141,18 +143,18 @@ public class TerminalWidget extends AbstractWidget {
     }
 
     @Override
-    public boolean mouseClicked(double mouseX, double mouseY, int button) {
+    public boolean mouseClicked(MouseButtonEvent event, boolean doubleClick) {
-        if (!inTermRegion(mouseX, mouseY)) return false;
+        if (!inTermRegion(event.x(), event.y())) return false;
-        if (!hasMouseSupport() || button < 0 || button > 2) return false;
+        if (!hasMouseSupport() || event.button() < 0 || event.button() > 2) return false;
 
-        var charX = (int) ((mouseX - innerX) / FONT_WIDTH);
+        var charX = (int) ((event.x() - innerX) / FONT_WIDTH);
-        var charY = (int) ((mouseY - innerY) / FONT_HEIGHT);
+        var charY = (int) ((event.y() - innerY) / FONT_HEIGHT);
         charX = Math.min(Math.max(charX, 0), terminal.getWidth() - 1);
         charY = Math.min(Math.max(charY, 0), terminal.getHeight() - 1);
 
-        computer.mouseClick(button + 1, charX + 1, charY + 1);
+        computer.mouseClick(event.button() + 1, charX + 1, charY + 1);
 
-        lastMouseButton = button;
+        lastMouseButton = event.button();
         lastMouseX = charX;
         lastMouseY = charY;
 
@@ -160,16 +162,16 @@ public class TerminalWidget extends AbstractWidget {
     }
 
     @Override
-    public boolean mouseReleased(double mouseX, double mouseY, int button) {
+    public boolean mouseReleased(MouseButtonEvent event) {
-        if (!inTermRegion(mouseX, mouseY)) return false;
+        if (!inTermRegion(event.x(), event.y())) return false;
-        if (!hasMouseSupport() || button < 0 || button > 2) return false;
+        if (!hasMouseSupport() || event.button() < 0 || event.button() > 2) return false;
 
-        var charX = (int) ((mouseX - innerX) / FONT_WIDTH);
+        var charX = (int) ((event.x() - innerX) / FONT_WIDTH);
-        var charY = (int) ((mouseY - innerY) / FONT_HEIGHT);
+        var charY = (int) ((event.y() - innerY) / FONT_HEIGHT);
         charX = Math.min(Math.max(charX, 0), terminal.getWidth() - 1);
         charY = Math.min(Math.max(charY, 0), terminal.getHeight() - 1);
 
-        if (lastMouseButton == button) {
+        if (lastMouseButton == event.button()) {
             computer.mouseUp(lastMouseButton + 1, charX + 1, charY + 1);
             lastMouseButton = -1;
         }
@@ -181,17 +183,17 @@ public class TerminalWidget extends AbstractWidget {
     }
 
     @Override
-    public boolean mouseDragged(double mouseX, double mouseY, int button, double v2, double v3) {
+    public boolean mouseDragged(MouseButtonEvent event, double v2, double v3) {
-        if (!inTermRegion(mouseX, mouseY)) return false;
+        if (!inTermRegion(event.x(), event.y())) return false;
-        if (!hasMouseSupport() || button < 0 || button > 2) return false;
+        if (!hasMouseSupport() || event.button() < 0 || event.button() > 2) return false;
 
-        var charX = (int) ((mouseX - innerX) / FONT_WIDTH);
+        var charX = (int) ((event.x() - innerX) / FONT_WIDTH);
-        var charY = (int) ((mouseY - innerY) / FONT_HEIGHT);
+        var charY = (int) ((event.y() - innerY) / FONT_HEIGHT);
         charX = Math.min(Math.max(charX, 0), terminal.getWidth() - 1);
         charY = Math.min(Math.max(charY, 0), terminal.getHeight() - 1);
 
-        if (button == lastMouseButton && (charX != lastMouseX || charY != lastMouseY)) {
+        if (event.button() == lastMouseButton && (charX != lastMouseX || charY != lastMouseY)) {
-            computer.mouseDrag(button + 1, charX + 1, charY + 1);
+            computer.mouseDrag(event.button() + 1, charX + 1, charY + 1);
             lastMouseX = charX;
             lastMouseY = charY;
         }
@@ -308,9 +310,8 @@ public class TerminalWidget extends AbstractWidget {
         @Nullable ScreenRectangle scissorArea
     ) implements GuiElementRenderState {
         @Override
-        public void buildVertices(VertexConsumer vertexConsumer, float z) {
+        public void buildVertices(VertexConsumer buffer) {
-            var quads = new FixedWidthFontRenderer.QuadEmitter(new Matrix4f().mul(pose).translate(0, 0, z), vertexConsumer);
+            FixedWidthFontRenderer.drawTerminalBackground(new Matrix4f().mul(pose), buffer, x, y, terminal, MARGIN, MARGIN, MARGIN, MARGIN);
-            FixedWidthFontRenderer.drawTerminalBackground(quads, x, y, terminal, MARGIN, MARGIN, MARGIN, MARGIN);
         }
 
         @Override
@@ -324,14 +325,14 @@ public class TerminalWidget extends AbstractWidget {
         @Nullable ScreenRectangle bounds, @Nullable ScreenRectangle scissorArea
     ) implements GuiElementRenderState {
         @Override
-        public void buildVertices(VertexConsumer vertexConsumer, float z) {
+        public void buildVertices(VertexConsumer buffer) {
-            var quads = new FixedWidthFontRenderer.QuadEmitter(new Matrix4f().mul(pose).translate(0, 0, z), vertexConsumer);
+            var transform = new Matrix4f().mul(pose);
-            FixedWidthFontRenderer.drawTerminalForeground(quads, x, y, terminal);
+            FixedWidthFontRenderer.drawTerminalForeground(transform, buffer, x, y, terminal);
-            FixedWidthFontRenderer.drawCursor(quads, x, y, terminal);
+            FixedWidthFontRenderer.drawCursor(transform, buffer, x, y, terminal);
 
             // The GUI renderer requires that the buffer is non-empty. Add a zero-size vertex so we always have something.
             for (var i = 0; i < 4; i++) {
-                vertexConsumer.addVertex(0, 0, z).setColor(0x00ffffff).setUv(0, 0).setLight(LightTexture.FULL_BRIGHT);
+                buffer.addVertex(0, 0, 0).setColor(0x00ffffff).setUv(0, 0).setLight(LightTexture.FULL_BRIGHT);
             }
         }
 

projects/common/src/client/java/dan200/computercraft/client/integration/emi/EMIComputerCraft.java

@@ -1,49 +0,0 @@
-// SPDX-FileCopyrightText: 2023 The CC: Tweaked Developers
-//
-// SPDX-License-Identifier: MPL-2.0
-
-package dan200.computercraft.client.integration.emi;
-
-import dan200.computercraft.api.turtle.TurtleSide;
-import dan200.computercraft.shared.ModRegistry;
-import dan200.computercraft.shared.integration.RecipeModHelpers;
-import dan200.computercraft.shared.pocket.items.PocketComputerItem;
-import dan200.computercraft.shared.turtle.items.TurtleItem;
-import dev.emi.emi.api.EmiEntrypoint;
-import dev.emi.emi.api.EmiPlugin;
-import dev.emi.emi.api.EmiRegistry;
-import dev.emi.emi.api.stack.Comparison;
-import dev.emi.emi.api.stack.EmiStack;
-import net.minecraft.client.Minecraft;
-import net.minecraft.world.item.ItemStack;
-
-import java.util.function.BiPredicate;
-
-@EmiEntrypoint
-public class EMIComputerCraft implements EmiPlugin {
-    @Override
-    public void register(EmiRegistry registry) {
-        registry.setDefaultComparison(ModRegistry.Items.TURTLE_NORMAL.get(), turtleComparison);
-        registry.setDefaultComparison(ModRegistry.Items.TURTLE_ADVANCED.get(), turtleComparison);
-
-        registry.setDefaultComparison(ModRegistry.Items.POCKET_COMPUTER_NORMAL.get(), pocketComparison);
-        registry.setDefaultComparison(ModRegistry.Items.POCKET_COMPUTER_ADVANCED.get(), pocketComparison);
-
-        for (var stack : RecipeModHelpers.getExtraStacks(Minecraft.getInstance().level.registryAccess())) {
-            registry.addEmiStack(EmiStack.of(stack));
-        }
-    }
-
-    private static final Comparison turtleComparison = compareStacks((left, right)
-        -> TurtleItem.getUpgrade(left, TurtleSide.LEFT) == TurtleItem.getUpgrade(right, TurtleSide.LEFT)
-        && TurtleItem.getUpgrade(left, TurtleSide.RIGHT) == TurtleItem.getUpgrade(right, TurtleSide.RIGHT));
-
-    private static final Comparison pocketComparison = compareStacks((left, right) -> PocketComputerItem.getUpgrade(left) == PocketComputerItem.getUpgrade(right));
-
-    private static Comparison compareStacks(BiPredicate<ItemStack, ItemStack> test) {
-        return Comparison.of((left, right) -> {
-            ItemStack leftStack = left.getItemStack(), rightStack = right.getItemStack();
-            return leftStack.getItem() == rightStack.getItem() && test.test(leftStack, rightStack);
-        });
-    }
-}

projects/common/src/client/java/dan200/computercraft/client/item/model/TurtleOverlayModel.java

@@ -17,7 +17,7 @@ import net.minecraft.client.renderer.item.ItemModel;
 import net.minecraft.client.renderer.item.ItemModelResolver;
 import net.minecraft.client.renderer.item.ItemStackRenderState;
 import net.minecraft.resources.ResourceLocation;
-import net.minecraft.world.entity.LivingEntity;
+import net.minecraft.world.entity.ItemOwner;
 import net.minecraft.world.item.ItemDisplayContext;
 import net.minecraft.world.item.ItemStack;
 import org.jspecify.annotations.Nullable;
@@ -35,7 +35,7 @@ public record TurtleOverlayModel(ItemTransforms transforms) implements ItemModel
     ).apply(instance, Unbaked::new));
 
     @Override
-    public void update(ItemStackRenderState state, ItemStack stack, ItemModelResolver resolver, ItemDisplayContext context, @Nullable ClientLevel level, @Nullable LivingEntity holder, int light) {
+    public void update(ItemStackRenderState state, ItemStack stack, ItemModelResolver resolver, ItemDisplayContext context, @Nullable ClientLevel level, @Nullable ItemOwner holder, int light) {
         var overlay = TurtleItem.getOverlay(stack);
         if (overlay == null) return;
 

projects/common/src/client/java/dan200/computercraft/client/item/model/TurtleUpgradeModel.java

@@ -17,7 +17,7 @@ import net.minecraft.client.renderer.item.ItemModel;
 import net.minecraft.client.renderer.item.ItemModelResolver;
 import net.minecraft.client.renderer.item.ItemStackRenderState;
 import net.minecraft.resources.ResourceLocation;
-import net.minecraft.world.entity.LivingEntity;
+import net.minecraft.world.entity.ItemOwner;
 import net.minecraft.world.item.ItemDisplayContext;
 import net.minecraft.world.item.ItemStack;
 import org.jspecify.annotations.Nullable;
@@ -36,7 +36,7 @@ public record TurtleUpgradeModel(TurtleSide side, ItemTransforms base) implement
     ).apply(instance, Unbaked::new));
 
     @Override
-    public void update(ItemStackRenderState state, ItemStack stack, ItemModelResolver resolver, ItemDisplayContext context, @Nullable ClientLevel level, @Nullable LivingEntity holder, int seed) {
+    public void update(ItemStackRenderState state, ItemStack stack, ItemModelResolver resolver, ItemDisplayContext context, @Nullable ClientLevel level, @Nullable ItemOwner holder, int seed) {
         var upgrade = TurtleItem.getUpgradeWithData(stack, side);
         if (upgrade == null) return;
 

projects/common/src/client/java/dan200/computercraft/client/model/LecternBookModel.java

@@ -0,0 +1,65 @@
+// SPDX-FileCopyrightText: 2025 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package dan200.computercraft.client.model;
+
+import dan200.computercraft.api.ComputerCraftAPI;
+import dan200.computercraft.client.render.CustomLecternRenderer;
+import dan200.computercraft.shared.media.items.PrintoutItem;
+import net.minecraft.client.model.Model;
+import net.minecraft.client.model.geom.ModelLayerLocation;
+import net.minecraft.client.model.geom.ModelPart;
+import net.minecraft.client.model.geom.PartPose;
+import net.minecraft.client.model.geom.builders.CubeListBuilder;
+import net.minecraft.client.model.geom.builders.LayerDefinition;
+import net.minecraft.client.model.geom.builders.MeshDefinition;
+import net.minecraft.client.renderer.RenderType;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.util.Unit;
+
+import static dan200.computercraft.client.model.LecternPrintoutModelDefinitions.TEXTURE_HEIGHT;
+import static dan200.computercraft.client.model.LecternPrintoutModelDefinitions.TEXTURE_WIDTH;
+
+/**
+ * A model for {@linkplain PrintoutItem printed books} placed on a lectern.
+ *
+ * @see CustomLecternRenderer
+ */
+public final class LecternBookModel extends Model<Unit> {
+    public static final ModelLayerLocation LAYER = new ModelLayerLocation(ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "lectern_book"), "main");
+
+    public LecternBookModel(ModelPart root) {
+        super(root, RenderType::entitySolid);
+    }
+
+    public static LayerDefinition createLayer() {
+        var mesh = new MeshDefinition();
+        var parts = mesh.getRoot();
+
+        parts.addOrReplaceChild(
+            "spine",
+            CubeListBuilder.create().texOffs(12, 15).addBox(-0.005f, -5.0f, -0.5f, 0, 10, 1.0f),
+            PartPose.ZERO
+        );
+
+        var angle = (float) Math.toRadians(5);
+        parts.addOrReplaceChild(
+            "left",
+            CubeListBuilder.create()
+                .texOffs(0, 10).addBox(0, -5.0f, -6.0f, 0, 10, 6.0f)
+                .texOffs(0, 0).addBox(0.005f, -4.0f, -5.0f, 1.0f, 8.0f, 5.0f),
+            PartPose.offsetAndRotation(-0.005f, 0, -0.5f, 0, -angle, 0)
+        );
+
+        parts.addOrReplaceChild(
+            "right",
+            CubeListBuilder.create()
+                .texOffs(14, 10).addBox(0, -5.0f, 0, 0, 10, 6.0f)
+                .texOffs(0, 0).addBox(0.005f, -4.0f, 0, 1.0f, 8.0f, 5.0f),
+            PartPose.offsetAndRotation(-0.005f, 0, 0.5f, 0, angle, 0)
+        );
+
+        return LayerDefinition.create(mesh, TEXTURE_WIDTH, TEXTURE_HEIGHT);
+    }
+}

projects/common/src/client/java/dan200/computercraft/client/model/LecternPocketModel.java

@@ -10,16 +10,22 @@ import dan200.computercraft.client.pocket.PocketComputerData;
 import dan200.computercraft.client.render.CustomLecternRenderer;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
 import dan200.computercraft.shared.pocket.items.PocketComputerItem;
+import net.minecraft.client.model.Model;
+import net.minecraft.client.model.geom.ModelLayerLocation;
 import net.minecraft.client.model.geom.ModelPart;
 import net.minecraft.client.model.geom.PartPose;
 import net.minecraft.client.model.geom.builders.CubeListBuilder;
+import net.minecraft.client.model.geom.builders.LayerDefinition;
 import net.minecraft.client.model.geom.builders.MeshDefinition;
 import net.minecraft.client.renderer.LightTexture;
-import net.minecraft.client.renderer.MultiBufferSource;
 import net.minecraft.client.renderer.RenderType;
-import net.minecraft.client.renderer.texture.TextureAtlas;
+import net.minecraft.client.renderer.Sheets;
+import net.minecraft.client.renderer.SubmitNodeCollector;
+import net.minecraft.client.renderer.texture.OverlayTexture;
 import net.minecraft.client.resources.model.Material;
+import net.minecraft.client.resources.model.MaterialSet;
 import net.minecraft.resources.ResourceLocation;
+import net.minecraft.util.Unit;
 import net.minecraft.world.item.component.DyedItemColor;
 
 /**
@@ -27,18 +33,14 @@ import net.minecraft.world.item.component.DyedItemColor;
  *
  * @see CustomLecternRenderer
  */
-public class LecternPocketModel {
+public class LecternPocketModel extends Model<Unit> {
-    public static final ResourceLocation TEXTURE_NORMAL = ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "entity/pocket_computer_normal");
+    public static final ModelLayerLocation LAYER = new ModelLayerLocation(ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "lectern_pocket"), "main");
-    public static final ResourceLocation TEXTURE_ADVANCED = ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "entity/pocket_computer_advanced");
-    public static final ResourceLocation TEXTURE_COLOUR = ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "entity/pocket_computer_colour");
-    public static final ResourceLocation TEXTURE_FRAME = ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "entity/pocket_computer_frame");
-    public static final ResourceLocation TEXTURE_LIGHT = ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "entity/pocket_computer_light");
 
-    private static final Material MATERIAL_NORMAL = new Material(TextureAtlas.LOCATION_BLOCKS, TEXTURE_NORMAL);
+    public static final Material MATERIAL_NORMAL = Sheets.BLOCK_ENTITIES_MAPPER.apply(ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "pocket_computer_normal"));
-    private static final Material MATERIAL_ADVANCED = new Material(TextureAtlas.LOCATION_BLOCKS, TEXTURE_ADVANCED);
+    public static final Material MATERIAL_ADVANCED = Sheets.BLOCK_ENTITIES_MAPPER.apply(ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "pocket_computer_advanced"));
-    private static final Material MATERIAL_COLOUR = new Material(TextureAtlas.LOCATION_BLOCKS, TEXTURE_COLOUR);
+    public static final Material MATERIAL_COLOUR = Sheets.BLOCK_ENTITIES_MAPPER.apply(ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "pocket_computer_colour"));
-    private static final Material MATERIAL_FRAME = new Material(TextureAtlas.LOCATION_BLOCKS, TEXTURE_FRAME);
+    public static final Material MATERIAL_FRAME = Sheets.BLOCK_ENTITIES_MAPPER.apply(ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "pocket_computer_frame"));
-    private static final Material MATERIAL_LIGHT = new Material(TextureAtlas.LOCATION_BLOCKS, TEXTURE_LIGHT);
+    public static final Material MATERIAL_LIGHT = Sheets.BLOCK_ENTITIES_MAPPER.apply(ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "pocket_computer_light"));
 
     // The size of the terminal within the model.
     public static final float TERM_WIDTH = 12.0f / 32.0f;
@@ -48,13 +50,11 @@ public class LecternPocketModel {
     private static final int TEXTURE_WIDTH = 48 / 2;
     private static final int TEXTURE_HEIGHT = 48 / 2;
 
-    private final ModelPart root;
+    public LecternPocketModel(ModelPart root) {
-
+        super(root, RenderType::entityCutout);
-    public LecternPocketModel() {
-        root = buildPages();
     }
 
-    private static ModelPart buildPages() {
+    public static LayerDefinition createLayer() {
         var mesh = new MeshDefinition();
         var parts = mesh.getRoot();
         parts.addOrReplaceChild(
@@ -62,29 +62,43 @@ public class LecternPocketModel {
             CubeListBuilder.create().texOffs(0, 0).addBox(0f, -5.0f, -4.0f, 1f, 10.0f, 8.0f),
             PartPose.ZERO
         );
-        return mesh.getRoot().bake(TEXTURE_WIDTH, TEXTURE_HEIGHT);
+        return LayerDefinition.create(mesh, TEXTURE_WIDTH, TEXTURE_HEIGHT);
     }
 
     /**
      * Render the pocket computer model.
      *
-     * @param poseStack     The current pose stack.
+     * @param poseStack   The current pose stack.
-     * @param bufferSource  The buffer source to draw to.
+     * @param collector   The collector to draw to.
-     * @param packedLight   The current light level.
+     * @param materials   The current materials
-     * @param packedOverlay The overlay texture (used for entity hurt animation).
+     * @param packedLight The current light level.
-     * @param family        The computer family.
+     * @param family      The computer family.
-     * @param frameColour   The pocket computer's {@linkplain DyedItemColor colour}.
+     * @param frameColour The pocket computer's {@linkplain DyedItemColor colour}.
-     * @param lightColour   The pocket computer's {@linkplain PocketComputerData#getLightState() light colour}.
+     * @param lightColour The pocket computer's {@linkplain PocketComputerData#getLightState() light colour}.
      */
-    public void render(PoseStack poseStack, MultiBufferSource bufferSource, int packedLight, int packedOverlay, ComputerFamily family, int frameColour, int lightColour) {
+    public void submit(
+        PoseStack poseStack, SubmitNodeCollector collector, MaterialSet materials, int packedLight, ComputerFamily family, int frameColour, int lightColour
+    ) {
         if (frameColour != -1) {
-            root.render(poseStack, MATERIAL_FRAME.buffer(bufferSource, RenderType::entityCutout), packedLight, packedOverlay);
+            collector.submitModel(
-            root.render(poseStack, MATERIAL_COLOUR.buffer(bufferSource, RenderType::entityCutout), packedLight, packedOverlay, frameColour);
+                this, Unit.INSTANCE, poseStack, MATERIAL_FRAME.renderType(RenderType::entityCutout),
+                packedLight, OverlayTexture.NO_OVERLAY, -1, materials.get(MATERIAL_FRAME), 0, null
+            );
+            collector.submitModel(
+                this, Unit.INSTANCE, poseStack, MATERIAL_COLOUR.renderType(RenderType::entityCutout),
+                packedLight, OverlayTexture.NO_OVERLAY, frameColour, materials.get(MATERIAL_COLOUR), 0, null
+            );
         } else {
-            var buffer = (family == ComputerFamily.ADVANCED ? MATERIAL_ADVANCED : MATERIAL_NORMAL).buffer(bufferSource, RenderType::entityCutout);
+            var material = family == ComputerFamily.ADVANCED ? MATERIAL_ADVANCED : MATERIAL_NORMAL;
-            root.render(poseStack, buffer, packedLight, packedOverlay);
+            collector.submitModel(
+                this, Unit.INSTANCE, poseStack, material.renderType(RenderType::entityCutout),
+                packedLight, OverlayTexture.NO_OVERLAY, -1, materials.get(material), 0, null
+            );
         }
 
-        root.render(poseStack, MATERIAL_LIGHT.buffer(bufferSource, RenderType::entityCutout), LightTexture.FULL_BRIGHT, packedOverlay, lightColour);
+        collector.submitModel(
+            this, Unit.INSTANCE, poseStack, MATERIAL_LIGHT.renderType(RenderType::entityCutout),
+            LightTexture.FULL_BRIGHT, OverlayTexture.NO_OVERLAY, lightColour, materials.get(MATERIAL_LIGHT), 0, null
+        );
     }
 }

projects/common/src/client/java/dan200/computercraft/client/model/LecternPrintoutModel.java

@@ -4,52 +4,46 @@
 
 package dan200.computercraft.client.model;
 
-import com.mojang.blaze3d.vertex.PoseStack;
-import com.mojang.blaze3d.vertex.VertexConsumer;
 import dan200.computercraft.api.ComputerCraftAPI;
 import dan200.computercraft.client.render.CustomLecternRenderer;
 import dan200.computercraft.shared.media.items.PrintoutItem;
+import net.minecraft.client.model.Model;
+import net.minecraft.client.model.geom.ModelLayerLocation;
 import net.minecraft.client.model.geom.ModelPart;
 import net.minecraft.client.model.geom.PartPose;
 import net.minecraft.client.model.geom.builders.CubeListBuilder;
+import net.minecraft.client.model.geom.builders.LayerDefinition;
 import net.minecraft.client.model.geom.builders.MeshDefinition;
-import net.minecraft.client.renderer.texture.TextureAtlas;
+import net.minecraft.client.renderer.RenderType;
-import net.minecraft.client.resources.model.Material;
 import net.minecraft.resources.ResourceLocation;
 
 import java.util.List;
 
+import static dan200.computercraft.client.model.LecternPrintoutModelDefinitions.TEXTURE_HEIGHT;
+import static dan200.computercraft.client.model.LecternPrintoutModelDefinitions.TEXTURE_WIDTH;
+
 /**
- * A model for {@linkplain PrintoutItem printouts} placed on a lectern.
+ * A model for {@linkplain PrintoutItem printouts} placed on a lectern. This renders a variable number of pages (1-3),
- * <p>
+ * stored in {@link State#pages}.
- * This provides two models, {@linkplain #renderPages(PoseStack, VertexConsumer, int, int, int) one for a variable
- * number of pages}, and {@linkplain #renderBook(PoseStack, VertexConsumer, int, int) one for books}.
  *
  * @see CustomLecternRenderer
  */
-public class LecternPrintoutModel {
+public final class LecternPrintoutModel extends Model<LecternPrintoutModel.State> {
-    public static final ResourceLocation TEXTURE = ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "entity/printout");
+    public static final ModelLayerLocation LAYER = new ModelLayerLocation(ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "lectern_printout"), "main");
-    public static final Material MATERIAL = new Material(TextureAtlas.LOCATION_BLOCKS, TEXTURE);
-
-    private static final int TEXTURE_WIDTH = 32;
-    private static final int TEXTURE_HEIGHT = 32;
 
     private static final String PAGE_1 = "page_1";
     private static final String PAGE_2 = "page_2";
     private static final String PAGE_3 = "page_3";
     private static final List<String> PAGES = List.of(PAGE_1, PAGE_2, PAGE_3);
 
-    private final ModelPart pagesRoot;
-    private final ModelPart bookRoot;
     private final ModelPart[] pages;
 
-    public LecternPrintoutModel() {
+    public LecternPrintoutModel(ModelPart root) {
-        pagesRoot = buildPages();
+        super(root, RenderType::entitySolid);
-        bookRoot = buildBook();
+        pages = PAGES.stream().map(root::getChild).toArray(ModelPart[]::new);
-        pages = PAGES.stream().map(pagesRoot::getChild).toArray(ModelPart[]::new);
     }
 
-    private static ModelPart buildPages() {
+    public static LayerDefinition createLayer() {
         var mesh = new MeshDefinition();
         var parts = mesh.getRoot();
         parts.addOrReplaceChild(
@@ -69,49 +63,20 @@ public class LecternPrintoutModel {
             PartPose.offsetAndRotation(-0.25f, 0, -1.5f, (float) -Math.PI * (2f / 16), 0, 0)
         );
 
-        return mesh.getRoot().bake(TEXTURE_WIDTH, TEXTURE_HEIGHT);
+        return LayerDefinition.create(mesh, TEXTURE_WIDTH, TEXTURE_HEIGHT);
     }
 
-    private static ModelPart buildBook() {
+    @Override
-        var mesh = new MeshDefinition();
+    public void setupAnim(State renderState) {
-        var parts = mesh.getRoot();
+        var pageCount = renderState.pages;
-
-        parts.addOrReplaceChild(
-            "spine",
-            CubeListBuilder.create().texOffs(12, 15).addBox(-0.005f, -5.0f, -0.5f, 0, 10, 1.0f),
-            PartPose.ZERO
-        );
-
-        var angle = (float) Math.toRadians(5);
-        parts.addOrReplaceChild(
-            "left",
-            CubeListBuilder.create()
-                .texOffs(0, 10).addBox(0, -5.0f, -6.0f, 0, 10, 6.0f)
-                .texOffs(0, 0).addBox(0.005f, -4.0f, -5.0f, 1.0f, 8.0f, 5.0f),
-            PartPose.offsetAndRotation(-0.005f, 0, -0.5f, 0, -angle, 0)
-        );
-
-        parts.addOrReplaceChild(
-            "right",
-            CubeListBuilder.create()
-                .texOffs(14, 10).addBox(0, -5.0f, 0, 0, 10, 6.0f)
-                .texOffs(0, 0).addBox(0.005f, -4.0f, 0, 1.0f, 8.0f, 5.0f),
-            PartPose.offsetAndRotation(-0.005f, 0, 0.5f, 0, angle, 0)
-        );
-
-        return mesh.getRoot().bake(TEXTURE_WIDTH, TEXTURE_HEIGHT);
-    }
-
-    public void renderBook(PoseStack poseStack, VertexConsumer buffer, int packedLight, int packedOverlay) {
-        bookRoot.render(poseStack, buffer, packedLight, packedOverlay);
-    }
-
-    public void renderPages(PoseStack poseStack, VertexConsumer buffer, int packedLight, int packedOverlay, int pageCount) {
         if (pageCount > pages.length) pageCount = pages.length;
+
         var i = 0;
         for (; i < pageCount; i++) pages[i].visible = true;
         for (; i < pages.length; i++) pages[i].visible = false;
+    }
 
-        pagesRoot.render(poseStack, buffer, packedLight, packedOverlay);
+    public static class State {
+        public int pages;
     }
 }

projects/common/src/client/java/dan200/computercraft/client/model/LecternPrintoutModelDefinitions.java

@@ -0,0 +1,26 @@
+// SPDX-FileCopyrightText: 2025 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package dan200.computercraft.client.model;
+
+import dan200.computercraft.api.ComputerCraftAPI;
+import net.minecraft.client.renderer.Sheets;
+import net.minecraft.client.resources.model.Material;
+import net.minecraft.resources.ResourceLocation;
+
+/**
+ * Definitions for the lectern printout model.
+ *
+ * @see LecternBookModel
+ * @see LecternPrintoutModel
+ */
+public final class LecternPrintoutModelDefinitions {
+    public static final Material MATERIAL = Sheets.BLOCK_ENTITIES_MAPPER.apply(ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "printout"));
+
+    static final int TEXTURE_WIDTH = 32;
+    static final int TEXTURE_HEIGHT = 32;
+
+    private LecternPrintoutModelDefinitions() {
+    }
+}

projects/common/src/client/java/dan200/computercraft/client/render/CustomLecternRenderer.java

@@ -6,26 +6,36 @@ package dan200.computercraft.client.render;
 
 import com.mojang.blaze3d.vertex.PoseStack;
 import com.mojang.math.Axis;
+import dan200.computercraft.client.model.LecternBookModel;
 import dan200.computercraft.client.model.LecternPocketModel;
 import dan200.computercraft.client.model.LecternPrintoutModel;
+import dan200.computercraft.client.model.LecternPrintoutModelDefinitions;
 import dan200.computercraft.client.pocket.ClientPocketComputers;
 import dan200.computercraft.client.render.text.FixedWidthFontRenderer;
 import dan200.computercraft.core.terminal.Terminal;
 import dan200.computercraft.core.util.Colour;
 import dan200.computercraft.shared.ModRegistry;
+import dan200.computercraft.shared.computer.core.ComputerFamily;
 import dan200.computercraft.shared.lectern.CustomLecternBlockEntity;
 import dan200.computercraft.shared.media.items.PrintoutData;
 import dan200.computercraft.shared.media.items.PrintoutItem;
 import dan200.computercraft.shared.pocket.items.PocketComputerItem;
-import net.minecraft.client.renderer.MultiBufferSource;
 import net.minecraft.client.renderer.RenderType;
+import net.minecraft.client.renderer.SubmitNodeCollector;
 import net.minecraft.client.renderer.blockentity.BlockEntityRenderer;
 import net.minecraft.client.renderer.blockentity.BlockEntityRendererProvider;
 import net.minecraft.client.renderer.blockentity.LecternRenderer;
+import net.minecraft.client.renderer.blockentity.state.BlockEntityRenderState;
+import net.minecraft.client.renderer.feature.ModelFeatureRenderer;
+import net.minecraft.client.renderer.state.CameraRenderState;
+import net.minecraft.client.renderer.texture.OverlayTexture;
+import net.minecraft.client.resources.model.MaterialSet;
 import net.minecraft.util.ARGB;
+import net.minecraft.util.Unit;
 import net.minecraft.world.item.component.DyedItemColor;
 import net.minecraft.world.level.block.LecternBlock;
 import net.minecraft.world.phys.Vec3;
+import org.jspecify.annotations.Nullable;
 
 import static dan200.computercraft.client.render.ComputerBorderRenderer.MARGIN;
 import static dan200.computercraft.client.render.text.FixedWidthFontRenderer.FONT_HEIGHT;
@@ -36,60 +46,89 @@ import static dan200.computercraft.client.render.text.FixedWidthFontRenderer.FON
  * <p>
  * This largely follows {@link LecternRenderer}, but with support for multiple types of item.
  */
-public class CustomLecternRenderer implements BlockEntityRenderer<CustomLecternBlockEntity> {
+public class CustomLecternRenderer implements BlockEntityRenderer<CustomLecternBlockEntity, CustomLecternRenderer.State> {
     private static final int POCKET_TERMINAL_RENDER_DISTANCE = 32;
 
+    private final MaterialSet materials;
     private final LecternPrintoutModel printoutModel;
+    private final LecternBookModel bookModel;
     private final LecternPocketModel pocketModel;
 
     public CustomLecternRenderer(BlockEntityRendererProvider.Context context) {
-        printoutModel = new LecternPrintoutModel();
+        materials = context.materials();
-        pocketModel = new LecternPocketModel();
+        bookModel = new LecternBookModel(context.bakeLayer(LecternBookModel.LAYER));
+        printoutModel = new LecternPrintoutModel(context.bakeLayer(LecternPrintoutModel.LAYER));
+        pocketModel = new LecternPocketModel(context.bakeLayer(LecternPocketModel.LAYER));
     }
 
     @Override
-    public void render(CustomLecternBlockEntity lectern, float partialTick, PoseStack poseStack, MultiBufferSource buffer, int packedLight, int packedOverlay, Vec3 camera) {
+    public State createRenderState() {
-        poseStack.pushPose();
+        return new State();
-        poseStack.translate(0.5f, 1.0625f, 0.5f);
+    }
-        poseStack.mulPose(Axis.YP.rotationDegrees(-lectern.getBlockState().getValue(LecternBlock.FACING).getClockWise().toYRot()));
+
-        poseStack.mulPose(Axis.ZP.rotationDegrees(67.5f));
+    @Override
-        poseStack.translate(0, -0.125f, 0);
+    public void extractRenderState(CustomLecternBlockEntity lectern, State state, float f, Vec3 camera, ModelFeatureRenderer.@Nullable CrumblingOverlay overlay) {
+        BlockEntityRenderer.super.extractRenderState(lectern, state, f, camera, overlay);
 
         var item = lectern.getItem();
         if (item.getItem() instanceof PrintoutItem) {
-            var vertexConsumer = LecternPrintoutModel.MATERIAL.buffer(buffer, RenderType::entitySolid);
+            state.setPrintout(item.is(ModRegistry.Items.PRINTED_BOOK.get()), PrintoutData.getOrEmpty(item).pages());
-            if (item.is(ModRegistry.Items.PRINTED_BOOK.get())) {
-                printoutModel.renderBook(poseStack, vertexConsumer, packedLight, packedOverlay);
-            } else {
-                printoutModel.renderPages(poseStack, vertexConsumer, packedLight, packedOverlay, PrintoutData.getOrEmpty(item).pages());
-            }
         } else if (item.getItem() instanceof PocketComputerItem pocket) {
             var computer = ClientPocketComputers.get(item);
-
+            state.setPocket(
-            pocketModel.render(
+                pocket.getFamily(), DyedItemColor.getOrDefault(item, -1),
-                poseStack, buffer, packedLight, packedOverlay, pocket.getFamily(), DyedItemColor.getOrDefault(item, -1),
+                ARGB.opaque(computer == null || computer.getLightState() == -1 ? Colour.BLACK.getHex() : computer.getLightState()),
-                ARGB.opaque(computer == null || computer.getLightState() == -1 ? Colour.BLACK.getHex() : computer.getLightState())
+                // Only render a terminal if we're close to it.
+                computer == null || !Vec3.atCenterOf(lectern.getBlockPos()).closerThan(camera, POCKET_TERMINAL_RENDER_DISTANCE)
+                    ? null : computer.getTerminal()
             );
+        } else {
+            state.setUnknown();
+        }
+    }
+
+    @Override
+    public void submit(State state, PoseStack poseStack, SubmitNodeCollector collector, CameraRenderState cameraRenderState) {
+        poseStack.pushPose();
+        poseStack.translate(0.5f, 1.0625f, 0.5f);
+        poseStack.mulPose(Axis.YP.rotationDegrees(-state.blockState.getValue(LecternBlock.FACING).getClockWise().toYRot()));
+        poseStack.mulPose(Axis.ZP.rotationDegrees(67.5f));
+        poseStack.translate(0, -0.125f, 0);
+
+        if (state.type == Type.PRINTOUT) {
+            if (state.isBook) {
+                collector.submitModel(
+                    bookModel, Unit.INSTANCE, poseStack, LecternPrintoutModelDefinitions.MATERIAL.renderType(RenderType::entitySolid),
+                    state.lightCoords, OverlayTexture.NO_OVERLAY, -1,
+                    materials.get(LecternPrintoutModelDefinitions.MATERIAL), 0, null
+                );
+            } else {
+                collector.submitModel(
+                    printoutModel, state.printoutState, poseStack, LecternPrintoutModelDefinitions.MATERIAL.renderType(RenderType::entitySolid),
+                    state.lightCoords, OverlayTexture.NO_OVERLAY, -1,
+                    materials.get(LecternPrintoutModelDefinitions.MATERIAL), 0, null
+                );
+            }
+        } else if (state.type == Type.POCKET_COMPUTER) {
+            pocketModel.submit(poseStack, collector, materials, state.lightCoords, state.pocketFamily, state.pocketColour, state.pocketLight);
 
             // Jiggle the terminal about a bit, so (0, 0) is in the top left of the model's terminal hole.
             poseStack.mulPose(Axis.YP.rotationDegrees(90f));
             poseStack.translate(-0.5 * LecternPocketModel.TERM_WIDTH, 0.5 * LecternPocketModel.TERM_HEIGHT + 1f / 32.0f, 1 / 16.0f);
             poseStack.mulPose(Axis.XP.rotationDegrees(180));
 
-            // Either render the terminal or a black screen, depending on how close we are.
+            // Either render the terminal or a black screen.
-            var terminal = computer == null ? null : computer.getTerminal();
+            if (state.pocketTerminal != null) {
-            var quadEmitter = FixedWidthFontRenderer.toVertexConsumer(poseStack, buffer.getBuffer(FixedWidthFontRenderer.TERMINAL_TEXT));
+                renderPocketTerminal(poseStack, collector, state.pocketTerminal);
-            if (terminal != null && Vec3.atCenterOf(lectern.getBlockPos()).closerThan(camera, POCKET_TERMINAL_RENDER_DISTANCE)) {
-                renderPocketTerminal(poseStack, quadEmitter, terminal);
             } else {
-                FixedWidthFontRenderer.drawEmptyTerminal(quadEmitter, 0, 0, LecternPocketModel.TERM_WIDTH, LecternPocketModel.TERM_HEIGHT);
+                FixedWidthFontRenderer.drawEmptyTerminal(poseStack, collector, 0, 0, LecternPocketModel.TERM_WIDTH, LecternPocketModel.TERM_HEIGHT);
             }
         }
 
         poseStack.popPose();
     }
 
-    private static void renderPocketTerminal(PoseStack poseStack, FixedWidthFontRenderer.QuadEmitter quadEmitter, Terminal terminal) {
+    private static void renderPocketTerminal(PoseStack poseStack, SubmitNodeCollector collector, Terminal terminal) {
         var width = terminal.getWidth() * FONT_WIDTH;
         var height = terminal.getHeight() * FONT_HEIGHT;
 
@@ -103,6 +142,48 @@ public class CustomLecternRenderer implements BlockEntityRenderer<CustomLecternB
         var marginX = ((LecternPocketModel.TERM_WIDTH / scale) - width) / 2;
         var marginY = ((LecternPocketModel.TERM_HEIGHT / scale) - height) / 2;
 
-        FixedWidthFontRenderer.drawTerminal(quadEmitter, marginX, marginY, terminal, marginY, marginY, marginX, marginX);
+        collector.submitCustomGeometry(poseStack, FixedWidthFontRenderer.TERMINAL_TEXT, (pose, buffer) ->
+            FixedWidthFontRenderer.drawTerminal(pose.pose(), buffer, marginX, marginY, terminal, marginY, marginY, marginX, marginX));
+    }
+
+    private enum Type {
+        PRINTOUT,
+        POCKET_COMPUTER,
+        UNKNOWN,
+    }
+
+    public static final class State extends BlockEntityRenderState {
+        private Type type = Type.PRINTOUT;
+        private boolean isBook;
+        private final LecternPrintoutModel.State printoutState = new LecternPrintoutModel.State();
+
+        private ComputerFamily pocketFamily = ComputerFamily.NORMAL;
+        private int pocketColour;
+        private int pocketLight;
+        private @Nullable Terminal pocketTerminal; // TODO: Make this immutable
+
+        private State() {
+        }
+
+        private void setUnknown() {
+            this.type = Type.UNKNOWN;
+            this.pocketTerminal = null;
+        }
+
+        private void setPrintout(boolean isBook, int pages) {
+            this.type = Type.PRINTOUT;
+            this.isBook = isBook;
+            this.printoutState.pages = pages;
+
+            this.pocketTerminal = null;
+        }
+
+        private void setPocket(ComputerFamily family, int colour, int light, @Nullable Terminal terminal) {
+            this.type = Type.POCKET_COMPUTER;
+            this.pocketFamily = family;
+            this.pocketColour = colour;
+            this.pocketLight = light;
+            this.pocketTerminal = terminal;
+        }
     }
 }

projects/common/src/client/java/dan200/computercraft/client/render/ItemMapLikeRenderer.java

@@ -8,7 +8,7 @@ import com.mojang.blaze3d.vertex.PoseStack;
 import com.mojang.math.Axis;
 import net.minecraft.client.Minecraft;
 import net.minecraft.client.renderer.ItemInHandRenderer;
-import net.minecraft.client.renderer.MultiBufferSource;
+import net.minecraft.client.renderer.SubmitNodeCollector;
 import net.minecraft.util.Mth;
 import net.minecraft.world.InteractionHand;
 import net.minecraft.world.entity.HumanoidArm;
@@ -22,29 +22,29 @@ import java.util.Objects;
 /**
  * A base class for items which have map-like rendering when held in the hand.
  *
- * @see dan200.computercraft.client.ClientHooks#onRenderHeldItem(PoseStack, MultiBufferSource, int, InteractionHand, float, float, float, ItemStack)
+ * @see dan200.computercraft.client.ClientHooks#onRenderHeldItem(PoseStack, SubmitNodeCollector, int, InteractionHand, float, float, float, ItemStack)
  */
 public abstract class ItemMapLikeRenderer {
     /**
      * The main rendering method for the item.
      *
      * @param transform The matrix transformation stack
-     * @param render    The buffer to render to
+     * @param collector The buffer to render to
      * @param stack     The stack to render
      * @param light     The packed lightmap coordinates.
-     * @see ItemInHandRenderer#renderItem(LivingEntity, ItemStack, ItemDisplayContext, boolean, PoseStack, MultiBufferSource, int)
+     * @see ItemInHandRenderer#renderItem(LivingEntity, ItemStack, ItemDisplayContext, PoseStack, SubmitNodeCollector, int)
      */
-    protected abstract void renderItem(PoseStack transform, MultiBufferSource render, ItemStack stack, int light);
+    protected abstract void renderItem(PoseStack transform, SubmitNodeCollector collector, ItemStack stack, int light);
 
-    public void renderItemFirstPerson(PoseStack transform, MultiBufferSource render, int lightTexture, InteractionHand hand, float pitch, float equipProgress, float swingProgress, ItemStack stack) {
+    public void renderItemFirstPerson(PoseStack transform, SubmitNodeCollector collector, int lightTexture, InteractionHand hand, float pitch, float equipProgress, float swingProgress, ItemStack stack) {
         Player player = Objects.requireNonNull(Minecraft.getInstance().player);
 
         transform.pushPose();
         if (hand == InteractionHand.MAIN_HAND && player.getOffhandItem().isEmpty()) {
-            renderItemFirstPersonCenter(transform, render, lightTexture, pitch, equipProgress, swingProgress, stack);
+            renderItemFirstPersonCenter(transform, collector, lightTexture, pitch, equipProgress, swingProgress, stack);
         } else {
             renderItemFirstPersonSide(
-                transform, render, lightTexture,
+                transform, collector, lightTexture,
                 hand == InteractionHand.MAIN_HAND ? player.getMainArm() : player.getMainArm().getOpposite(),
                 equipProgress, swingProgress, stack
             );
@@ -56,15 +56,15 @@ public abstract class ItemMapLikeRenderer {
      * Renders the item to one side of the player.
      *
      * @param transform     The matrix transformation stack
-     * @param render        The buffer to render to
+     * @param collector     The buffer to render to
      * @param combinedLight The current light level
      * @param side          The side to render on
      * @param equipProgress The equip progress of this item
      * @param swingProgress The swing progress of this item
      * @param stack         The stack to render
-     * @see ItemInHandRenderer#renderOneHandedMap(PoseStack, MultiBufferSource, int, float, HumanoidArm, float, ItemStack)
+     * @see ItemInHandRenderer#renderOneHandedMap(PoseStack, SubmitNodeCollector, int, float, HumanoidArm, float, ItemStack)
      */
-    private void renderItemFirstPersonSide(PoseStack transform, MultiBufferSource render, int combinedLight, HumanoidArm side, float equipProgress, float swingProgress, ItemStack stack) {
+    private void renderItemFirstPersonSide(PoseStack transform, SubmitNodeCollector collector, int combinedLight, HumanoidArm side, float equipProgress, float swingProgress, ItemStack stack) {
         var minecraft = Minecraft.getInstance();
         var offset = side == HumanoidArm.RIGHT ? 1f : -1f;
         transform.translate(offset * 0.125f, -0.125f, 0f);
@@ -73,7 +73,7 @@ public abstract class ItemMapLikeRenderer {
         if (!minecraft.player.isInvisible()) {
             transform.pushPose();
             transform.mulPose(Axis.ZP.rotationDegrees(offset * 10f));
-            minecraft.getEntityRenderDispatcher().getItemInHandRenderer().renderPlayerArm(transform, render, combinedLight, equipProgress, swingProgress, side);
+            minecraft.getEntityRenderDispatcher().getItemInHandRenderer().renderPlayerArm(transform, collector, combinedLight, equipProgress, swingProgress, side);
             transform.popPose();
         }
 
@@ -90,7 +90,7 @@ public abstract class ItemMapLikeRenderer {
         transform.mulPose(Axis.XP.rotationDegrees(f2 * -45f));
         transform.mulPose(Axis.YP.rotationDegrees(offset * f2 * -30f));
 
-        renderItem(transform, render, stack, combinedLight);
+        renderItem(transform, collector, stack, combinedLight);
 
         transform.popPose();
     }
@@ -99,15 +99,15 @@ public abstract class ItemMapLikeRenderer {
      * Render an item in the middle of the screen.
      *
      * @param transform     The matrix transformation stack
-     * @param render        The buffer to render to
+     * @param collector     The buffer to render to
      * @param combinedLight The current light level
      * @param pitch         The pitch of the player
      * @param equipProgress The equip progress of this item
      * @param swingProgress The swing progress of this item
      * @param stack         The stack to render
-     * @see ItemInHandRenderer#renderTwoHandedMap(PoseStack, MultiBufferSource, int, float, float, float)
+     * @see ItemInHandRenderer#renderTwoHandedMap(PoseStack, SubmitNodeCollector, int, float, float, float)
      */
-    private void renderItemFirstPersonCenter(PoseStack transform, MultiBufferSource render, int combinedLight, float pitch, float equipProgress, float swingProgress, ItemStack stack) {
+    private void renderItemFirstPersonCenter(PoseStack transform, SubmitNodeCollector collector, int combinedLight, float pitch, float equipProgress, float swingProgress, ItemStack stack) {
         var minecraft = Minecraft.getInstance();
         var renderer = minecraft.getEntityRenderDispatcher().getItemInHandRenderer();
 
@@ -124,8 +124,8 @@ public abstract class ItemMapLikeRenderer {
         if (!minecraft.player.isInvisible()) {
             transform.pushPose();
             transform.mulPose(Axis.YP.rotationDegrees(90.0F));
-            renderer.renderMapHand(transform, render, combinedLight, HumanoidArm.RIGHT);
+            renderer.renderMapHand(transform, collector, combinedLight, HumanoidArm.RIGHT);
-            renderer.renderMapHand(transform, render, combinedLight, HumanoidArm.LEFT);
+            renderer.renderMapHand(transform, collector, combinedLight, HumanoidArm.LEFT);
             transform.popPose();
         }
 
@@ -133,6 +133,6 @@ public abstract class ItemMapLikeRenderer {
         transform.mulPose(Axis.XP.rotationDegrees(rX * 20.0F));
         transform.scale(2.0F, 2.0F, 2.0F);
 
-        renderItem(transform, render, stack, combinedLight);
+        renderItem(transform, collector, stack, combinedLight);
     }
 }

projects/common/src/client/java/dan200/computercraft/client/render/PocketItemRenderer.java

@@ -15,12 +15,14 @@ import dan200.computercraft.shared.config.Config;
 import dan200.computercraft.shared.pocket.items.PocketComputerItem;
 import net.minecraft.client.Minecraft;
 import net.minecraft.client.renderer.LightTexture;
-import net.minecraft.client.renderer.MultiBufferSource;
+import net.minecraft.client.renderer.SubmitNodeCollector;
+import net.minecraft.client.renderer.texture.TextureAtlasSprite;
+import net.minecraft.client.resources.metadata.gui.GuiMetadataSection;
 import net.minecraft.client.resources.metadata.gui.GuiSpriteScaling;
+import net.minecraft.data.AtlasIds;
 import net.minecraft.util.ARGB;
 import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.item.component.DyedItemColor;
-import org.joml.Matrix4f;
 
 import static dan200.computercraft.client.render.ComputerBorderRenderer.BORDER;
 import static dan200.computercraft.client.render.ComputerBorderRenderer.MARGIN;
@@ -42,7 +44,7 @@ public final class PocketItemRenderer extends ItemMapLikeRenderer {
     }
 
     @Override
-    protected void renderItem(PoseStack transform, MultiBufferSource bufferSource, ItemStack stack, int light) {
+    protected void renderItem(PoseStack transform, SubmitNodeCollector collector, ItemStack stack, int light) {
         var computer = ClientPocketComputers.get(stack);
         var terminal = computer == null ? null : computer.getTerminal();
 
@@ -74,42 +76,41 @@ public final class PocketItemRenderer extends ItemMapLikeRenderer {
         var family = item.getFamily();
         var frameColour = DyedItemColor.getOrDefault(stack, -1);
 
-        var matrix = transform.last().pose();
+        renderFrame(transform, collector, family, frameColour, light, width, height);
-        renderFrame(matrix, bufferSource, family, frameColour, light, width, height);
 
         // Render the light
         var lightColour = computer == null || computer.getLightState() == -1 ? Colour.BLACK.getHex() : computer.getLightState();
-        renderLight(transform, bufferSource, lightColour, width, height);
+        renderLight(transform, collector, lightColour, width, height);
 
-        var quadEmitter = FixedWidthFontRenderer.toVertexConsumer(transform, bufferSource.getBuffer(FixedWidthFontRenderer.TERMINAL_TEXT));
         if (terminal == null) {
-            FixedWidthFontRenderer.drawEmptyTerminal(quadEmitter, 0, 0, width, height);
+            FixedWidthFontRenderer.drawEmptyTerminal(transform, collector, 0, 0, width, height);
         } else {
-            FixedWidthFontRenderer.drawTerminal(quadEmitter, MARGIN, MARGIN, terminal, MARGIN, MARGIN, MARGIN, MARGIN);
+            collector.submitCustomGeometry(transform, FixedWidthFontRenderer.TERMINAL_TEXT, (pose, buffer) ->
+                FixedWidthFontRenderer.drawTerminal(pose.pose(), buffer, MARGIN, MARGIN, terminal, MARGIN, MARGIN, MARGIN, MARGIN));
         }
 
         transform.popPose();
     }
 
-    private static void renderFrame(Matrix4f transform, MultiBufferSource render, ComputerFamily family, int colour, int light, int width, int height) {
+    private static void renderFrame(PoseStack transform, SubmitNodeCollector submit, ComputerFamily family, int colour, int light, int width, int height) {
         var textures = colour != -1 ? GuiSprites.COMPUTER_COLOUR : GuiSprites.getComputerTextures(family);
-        var spriteRenderer = new SpriteRenderer(transform, render, 0, light, colour);
+        var spriteRenderer = new SpriteRenderer(transform, submit, 0, light, colour);
         renderBorder(spriteRenderer, textures, width, height);
     }
 
     private static void renderBorder(SpriteRenderer renderer, GuiSprites.ComputerTextures textures, int width, int height) {
-        var sprites = Minecraft.getInstance().getGuiSprites();
+        var sprites = Minecraft.getInstance().getAtlasManager().getAtlasOrThrow(AtlasIds.GUI);
 
         // Find our border, forcing it to be a nine-sliced texture.
         var borderSprite = sprites.getSprite(textures.border());
-        var borderSlice = getSlice(sprites.getSpriteScaling(borderSprite), DEFAULT_BORDER);
+        var borderSlice = getSlice(borderSprite, DEFAULT_BORDER);
         var borderBounds = borderSlice.border();
 
         // And take the separate bottom bit of the pocket computer.
         var bottomTexture = textures.pocketBottom();
         if (bottomTexture == null) throw new NullPointerException(textures + " has no pocket texture");
         var bottomSprite = sprites.getSprite(bottomTexture);
-        var bottomSlice = getSlice(sprites.getSpriteScaling(bottomSprite), DEFAULT_BOTTOM);
+        var bottomSlice = getSlice(bottomSprite, DEFAULT_BOTTOM);
         var bottomBounds = bottomSlice.border();
 
         // Now draw a nine-sliced texture, by stitching together the top parts of the border with the pocket bottom.
@@ -157,13 +158,12 @@ public final class PocketItemRenderer extends ItemMapLikeRenderer {
         );
     }
 
-    private static void renderLight(PoseStack transform, MultiBufferSource render, int colour, int width, int height) {
+    private static void renderLight(PoseStack transform, SubmitNodeCollector render, int colour, int width, int height) {
-        var buffer = render.getBuffer(FixedWidthFontRenderer.TERMINAL_TEXT);
+        render.submitCustomGeometry(transform, FixedWidthFontRenderer.TERMINAL_TEXT, (pose, buffer) -> FixedWidthFontRenderer.drawQuad(
-        FixedWidthFontRenderer.drawQuad(
+            pose.pose(), buffer,
-            FixedWidthFontRenderer.toVertexConsumer(transform, buffer),
             width - LIGHT_HEIGHT * 2, height + BORDER / 2.0f, 0.001f, LIGHT_HEIGHT * 2, LIGHT_HEIGHT,
             ARGB.opaque(colour), LightTexture.FULL_BRIGHT
-        );
+        ));
     }
 
     private static final GuiSpriteScaling.NineSlice DEFAULT_BORDER = new GuiSpriteScaling.NineSlice(
@@ -177,4 +177,8 @@ public final class PocketItemRenderer extends ItemMapLikeRenderer {
     private static GuiSpriteScaling.NineSlice getSlice(GuiSpriteScaling scaling, GuiSpriteScaling.NineSlice fallback) {
         return scaling instanceof GuiSpriteScaling.NineSlice slice ? slice : fallback;
     }
+
+    private static GuiSpriteScaling.NineSlice getSlice(TextureAtlasSprite sprite, GuiSpriteScaling.NineSlice fallback) {
+        return getSlice(sprite.contents().getAdditionalMetadata(GuiMetadataSection.TYPE).orElse(GuiMetadataSection.DEFAULT).scaling(), fallback);
+    }
 }

projects/common/src/client/java/dan200/computercraft/client/render/PrintoutItemRenderer.java

@@ -6,9 +6,10 @@ package dan200.computercraft.client.render;
 
 import com.mojang.blaze3d.vertex.PoseStack;
 import com.mojang.math.Axis;
+import dan200.computercraft.client.render.text.FixedWidthFontRenderer;
 import dan200.computercraft.shared.ModRegistry;
 import dan200.computercraft.shared.media.items.PrintoutData;
-import net.minecraft.client.renderer.MultiBufferSource;
+import net.minecraft.client.renderer.SubmitNodeCollector;
 import net.minecraft.client.renderer.entity.state.ItemFrameRenderState;
 import net.minecraft.world.item.ItemStack;
 
@@ -28,26 +29,26 @@ public final class PrintoutItemRenderer extends ItemMapLikeRenderer {
     }
 
     @Override
-    protected void renderItem(PoseStack transform, MultiBufferSource render, ItemStack stack, int light) {
+    protected void renderItem(PoseStack transform, SubmitNodeCollector collector, ItemStack stack, int light) {
         transform.mulPose(Axis.XP.rotationDegrees(180f));
         transform.scale(0.42f, 0.42f, -0.42f);
         transform.translate(-0.5f, -0.48f, 0.0f);
 
-        drawPrintout(transform, render, PrintoutData.getOrEmpty(stack), stack.getItem() == ModRegistry.Items.PRINTED_BOOK.get(), light);
+        drawPrintout(transform, collector, PrintoutData.getOrEmpty(stack), stack.getItem() == ModRegistry.Items.PRINTED_BOOK.get(), light);
     }
 
-    public static void onRenderInFrame(PoseStack transform, MultiBufferSource render, ItemFrameRenderState frame, PrintoutData data, boolean isBook, int packedLight) {
+    public static void onRenderInFrame(PoseStack transform, SubmitNodeCollector collector, ItemFrameRenderState frame, PrintoutData data, boolean isBook) {
         // Move a little bit forward to ensure we're not clipping with the frame
         transform.translate(0.0f, 0.0f, -0.001f);
         transform.mulPose(Axis.ZP.rotationDegrees(180f));
         transform.scale(0.95f, 0.95f, -0.95f);
         transform.translate(-0.5f, -0.5f, 0.0f);
 
-        var light = frame.isGlowFrame ? 0xf000d2 : packedLight; // See getLightCoords.
+        var light = frame.isGlowFrame ? 0xf000d2 : frame.lightCoords; // See getLightCoords.
-        drawPrintout(transform, render, data, isBook, light);
+        drawPrintout(transform, collector, data, isBook, light);
     }
 
-    private static void drawPrintout(PoseStack transform, MultiBufferSource render, PrintoutData pageData, boolean book, int light) {
+    private static void drawPrintout(PoseStack transform, SubmitNodeCollector collector, PrintoutData pageData, boolean book, int light) {
         var pages = pageData.pages();
 
         double width = LINE_LENGTH * FONT_WIDTH + X_TEXT_MARGIN * 2;
@@ -71,7 +72,7 @@ public final class PrintoutItemRenderer extends ItemMapLikeRenderer {
         transform.scale(scale, scale, scale);
         transform.translate((max - width) / 2.0, (max - height) / 2.0, 0.0);
 
-        drawBorder(transform, render, 0, 0, -0.01f, 0, pages, book, light);
+        collector.submitCustomGeometry(transform, BACKGROUND, (matrix, buffer) -> drawBorder(matrix.pose(), buffer, 0, 0, -0.01f, 0, pages, book, light));
-        drawText(transform, render, X_TEXT_MARGIN, Y_TEXT_MARGIN, 0, light, pageData.lines());
+        collector.submitCustomGeometry(transform, FixedWidthFontRenderer.TERMINAL_TEXT, (matrix, buffer) -> drawText(matrix.pose(), buffer, X_TEXT_MARGIN, Y_TEXT_MARGIN, 0, light, pageData.lines()));
     }
 }

projects/common/src/client/java/dan200/computercraft/client/render/PrintoutRenderer.java

@@ -29,7 +29,7 @@ public final class PrintoutRenderer {
      * Printout's background texture. {@link RenderType#text(ResourceLocation)} is a <em>little</em> questionable, but
      * it is what maps use, so should behave the same as vanilla in both item frames and in-hand.
      */
-    private static final RenderType BACKGROUND = RenderType.text(ResourceLocation.fromNamespaceAndPath("computercraft", "textures/gui/printout.png"));
+    public static final RenderType BACKGROUND = RenderType.text(ResourceLocation.fromNamespaceAndPath("computercraft", "textures/gui/printout.png"));
 
     private static final float BG_SIZE = 256.0f;
 
@@ -74,21 +74,20 @@ public final class PrintoutRenderer {
 
     public static void drawText(PoseStack transform, MultiBufferSource bufferSource, int x, int y, int start, int light, TextBuffer[] text, TextBuffer[] colours) {
         var buffer = bufferSource.getBuffer(FixedWidthFontRenderer.TERMINAL_TEXT);
-        var emitter = FixedWidthFontRenderer.toVertexConsumer(transform, buffer);
         for (var line = 0; line < LINES_PER_PAGE && line < text.length; line++) {
-            FixedWidthFontRenderer.drawString(emitter,
+            FixedWidthFontRenderer.drawString(
+                transform.last().pose(), buffer,
                 x, y + line * FONT_HEIGHT, text[start + line], colours[start + line],
                 Palette.DEFAULT, light
             );
         }
     }
 
-    public static void drawText(PoseStack transform, MultiBufferSource bufferSource, int x, int y, int start, int light, List<PrintoutData.Line> lines) {
+    public static void drawText(Matrix4f matrix4f, VertexConsumer buffer, int x, int y, int start, int light, List<PrintoutData.Line> lines) {
-        var buffer = bufferSource.getBuffer(FixedWidthFontRenderer.TERMINAL_TEXT);
-        var emitter = FixedWidthFontRenderer.toVertexConsumer(transform, buffer);
         for (var line = 0; line < LINES_PER_PAGE && line < lines.size(); line++) {
             var lineContents = lines.get(start + line);
-            FixedWidthFontRenderer.drawString(emitter,
+            FixedWidthFontRenderer.drawString(
+                matrix4f, buffer,
                 x, y + line * FONT_HEIGHT,
                 new TextBuffer(lineContents.text()), new TextBuffer(lineContents.foreground()),
                 Palette.DEFAULT, light
@@ -96,13 +95,10 @@ public final class PrintoutRenderer {
         }
     }
 
-    public static void drawBorder(PoseStack transform, MultiBufferSource bufferSource, float x, float y, float z, int page, int pages, boolean isBook, int light) {
+    public static void drawBorder(Matrix4f matrix, VertexConsumer buffer, float x, float y, float z, int page, int pages, boolean isBook, int light) {
-        var matrix = transform.last().pose();
         var leftPages = page;
         var rightPages = pages - page - 1;
 
-        var buffer = bufferSource.getBuffer(BACKGROUND);
-
         if (isBook) {
             // Border
             var offset = offsetAt(pages);

projects/common/src/client/java/dan200/computercraft/client/render/SpriteRenderer.java

@@ -4,13 +4,12 @@
 
 package dan200.computercraft.client.render;
 
+import com.mojang.blaze3d.vertex.PoseStack;
 import com.mojang.blaze3d.vertex.VertexConsumer;
 import net.minecraft.client.gui.GuiGraphics;
-import net.minecraft.client.renderer.MultiBufferSource;
 import net.minecraft.client.renderer.RenderType;
+import net.minecraft.client.renderer.SubmitNodeCollector;
 import net.minecraft.client.renderer.texture.TextureAtlasSprite;
-import net.minecraft.resources.ResourceLocation;
-import org.joml.Matrix4f;
 
 
 /**
@@ -21,17 +20,15 @@ import org.joml.Matrix4f;
  * sheet.
  */
 public class SpriteRenderer {
-    public static final ResourceLocation TEXTURE = ResourceLocation.withDefaultNamespace("textures/atlas/gui.png");
+    private final PoseStack transform;
-
+    private final SubmitNodeCollector submit;
-    private final Matrix4f transform;
-    private final MultiBufferSource buffers;
     private final int light;
     private final int z;
     private final int colour;
 
-    public SpriteRenderer(Matrix4f transform, MultiBufferSource buffers, int z, int light, int colour) {
+    public SpriteRenderer(PoseStack transform, SubmitNodeCollector submit, int z, int light, int colour) {
         this.transform = transform;
-        this.buffers = buffers;
+        this.submit = submit;
         this.z = z;
         this.light = light;
         this.colour = colour;
@@ -47,11 +44,12 @@ public class SpriteRenderer {
         var v0 = sprite.getV((float) spriteY / spriteHeight);
         var v1 = sprite.getV((float) (spriteY + height) / spriteHeight);
 
-        var vertices = buffers.getBuffer(RenderType.text(sprite.atlasLocation()));
+        submit.submitCustomGeometry(transform, RenderType.text(sprite.atlasLocation()), (t, vertices) -> {
-        vertices.addVertex(transform, x0, y1, z).setColor(colour).setUv(u0, v1).setLight(light);
+            vertices.addVertex(t, x0, y1, z).setColor(colour).setUv(u0, v1).setLight(light);
-        vertices.addVertex(transform, x1, y1, z).setColor(colour).setUv(u1, v1).setLight(light);
+            vertices.addVertex(t, x1, y1, z).setColor(colour).setUv(u1, v1).setLight(light);
-        vertices.addVertex(transform, x1, y0, z).setColor(colour).setUv(u1, v0).setLight(light);
+            vertices.addVertex(t, x1, y0, z).setColor(colour).setUv(u1, v0).setLight(light);
-        vertices.addVertex(transform, x0, y0, z).setColor(colour).setUv(u0, v0).setLight(light);
+            vertices.addVertex(t, x0, y0, z).setColor(colour).setUv(u0, v0).setLight(light);
+        });
     }
 
     public void blitTiled(

projects/common/src/client/java/dan200/computercraft/client/render/TurtleBlockEntityRenderer.java

@@ -4,9 +4,12 @@
 
 package dan200.computercraft.client.render;
 
+import com.google.errorprone.annotations.concurrent.LazyInit;
 import com.mojang.blaze3d.vertex.PoseStack;
 import com.mojang.math.Axis;
 import dan200.computercraft.api.ComputerCraftAPI;
+import dan200.computercraft.api.client.StandaloneModel;
+import dan200.computercraft.api.turtle.ITurtleAccess;
 import dan200.computercraft.api.turtle.TurtleSide;
 import dan200.computercraft.client.ClientRegistry;
 import dan200.computercraft.client.turtle.TurtleOverlay;
@@ -16,111 +19,147 @@ import dan200.computercraft.shared.computer.core.ComputerFamily;
 import dan200.computercraft.shared.turtle.blocks.TurtleBlockEntity;
 import dan200.computercraft.shared.util.Holiday;
 import net.minecraft.client.Minecraft;
-import net.minecraft.client.gui.Font;
+import net.minecraft.client.renderer.SubmitNodeCollector;
-import net.minecraft.client.renderer.MultiBufferSource;
+import net.minecraft.client.renderer.block.model.ItemTransform;
-import net.minecraft.client.renderer.blockentity.BlockEntityRenderDispatcher;
 import net.minecraft.client.renderer.blockentity.BlockEntityRenderer;
 import net.minecraft.client.renderer.blockentity.BlockEntityRendererProvider;
+import net.minecraft.client.renderer.blockentity.state.BlockEntityRenderState;
+import net.minecraft.client.renderer.feature.ModelFeatureRenderer;
+import net.minecraft.client.renderer.item.ItemModelResolver;
+import net.minecraft.client.renderer.item.ItemStackRenderState;
+import net.minecraft.client.renderer.state.CameraRenderState;
+import net.minecraft.client.renderer.texture.OverlayTexture;
+import net.minecraft.network.chat.Component;
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.util.ARGB;
-import net.minecraft.util.CommonColors;
 import net.minecraft.world.phys.BlockHitResult;
 import net.minecraft.world.phys.HitResult;
 import net.minecraft.world.phys.Vec3;
 import org.jspecify.annotations.Nullable;
 
-public class TurtleBlockEntityRenderer implements BlockEntityRenderer<TurtleBlockEntity> {
+public class TurtleBlockEntityRenderer implements BlockEntityRenderer<TurtleBlockEntity, TurtleBlockEntityRenderer.State> {
     public static final ResourceLocation NORMAL_TURTLE_MODEL = ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "block/turtle_normal");
     public static final ResourceLocation ADVANCED_TURTLE_MODEL = ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "block/turtle_advanced");
     public static final ResourceLocation COLOUR_TURTLE_MODEL = ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "block/turtle_colour");
 
-    private final BlockEntityRenderDispatcher renderer;
+    private final ItemModelResolver itemModelResolver;
-    private final Font font;
 
     public TurtleBlockEntityRenderer(BlockEntityRendererProvider.Context context) {
-        renderer = context.getBlockEntityRenderDispatcher();
+        itemModelResolver = context.itemModelResolver();
-        font = context.getFont();
+    }
+
+    public static final class State extends BlockEntityRenderState {
+        private @Nullable String label;
+        private Vec3 offset = Vec3.ZERO;
+        private int colour;
+        private float yaw;
+        private @LazyInit StandaloneModel model;
+        private @Nullable StandaloneModel overlay;
+        private @Nullable StandaloneModel elfOverlay;
+
+        private float leftAngle;
+        private final ItemStackRenderState leftUpgrade = new ItemStackRenderState();
+
+        private float rightAngle;
+        private final ItemStackRenderState rightUpgrade = new ItemStackRenderState();
+
+        private State() {
+        }
     }
 
     @Override
-    public void render(TurtleBlockEntity turtle, float partialTicks, PoseStack transform, MultiBufferSource buffers, int lightmapCoord, int overlayLight, Vec3 camera) {
+    public State createRenderState() {
+        return new State();
+    }
+
+    @Override
+    public void extractRenderState(TurtleBlockEntity turtle, State state, float partialTicks, Vec3 camera, ModelFeatureRenderer.@Nullable CrumblingOverlay crumblingOverlay) {
+        BlockEntityRenderer.super.extractRenderState(turtle, state, partialTicks, camera, crumblingOverlay);
+
+        var modelManager = Minecraft.getInstance().getModelManager();
+
+        var hit = Minecraft.getInstance().hitResult;
+        state.label = hit != null && hit.getType() == HitResult.Type.BLOCK && turtle.getBlockPos().equals(((BlockHitResult) hit).getBlockPos())
+            ? turtle.getLabel() : null;
+        state.colour = turtle.getColour();
+        state.offset = turtle.getRenderOffset(partialTicks);
+        state.yaw = turtle.getRenderYaw(partialTicks);
+
+        var modelLocation = state.colour == -1
+            ? (turtle.getFamily() == ComputerFamily.NORMAL ? NORMAL_TURTLE_MODEL : ADVANCED_TURTLE_MODEL)
+            : COLOUR_TURTLE_MODEL;
+        state.model = ClientRegistry.getModel(modelManager, modelLocation);
+
+        var overlay = TurtleOverlayManager.get(modelManager, turtle.getOverlay());
+        state.overlay = overlay == null ? null : overlay.model();
+        state.elfOverlay = Holiday.getCurrent() == Holiday.CHRISTMAS && (overlay == null || overlay.showElfOverlay())
+            ? ClientRegistry.getModel(modelManager, TurtleOverlay.ELF_MODEL)
+            : null;
+
+        state.leftAngle = turtle.getToolRenderAngle(TurtleSide.LEFT, partialTicks);
+        extractUpgrade(turtle.getAccess(), TurtleSide.LEFT, state.leftUpgrade);
+
+        state.rightAngle = turtle.getToolRenderAngle(TurtleSide.RIGHT, partialTicks);
+        extractUpgrade(turtle.getAccess(), TurtleSide.RIGHT, state.rightUpgrade);
+    }
+
+    private void extractUpgrade(ITurtleAccess turtle, TurtleSide side, ItemStackRenderState state) {
+        state.clear();
+        var upgrade = turtle.getUpgradeWithData(side);
+        if (upgrade == null) return;
+
+        TurtleUpgradeModelManager.get(Minecraft.getInstance().getModelManager(), upgrade.holder())
+            .renderForItem(upgrade, side, state, itemModelResolver, ItemTransform.NO_TRANSFORM, 31);
+    }
+
+    @Override
+    public void submit(State state, PoseStack transform, SubmitNodeCollector collector, CameraRenderState camera) {
         transform.pushPose();
 
         // Translate the turtle first, so the label moves with it.
-        var offset = turtle.getRenderOffset(partialTicks);
+        transform.translate(state.offset);
-        transform.translate(offset.x, offset.y, offset.z);
 
-        // Render the label
+        if (state.label != null) {
-        var label = turtle.getLabel();
+            collector.submitNameTag(
-        var hit = renderer.cameraHitResult;
+                transform, new Vec3(0.5, 1.2, 0.5), 0, Component.literal(state.label), false, state.lightCoords,
-        if (label != null && hit != null && hit.getType() == HitResult.Type.BLOCK && turtle.getBlockPos().equals(((BlockHitResult) hit).getBlockPos())) {
+                camera.pos.distanceToSqr(Vec3.atCenterOf(state.blockPos)), // TODO: Should we read camera from the render state instead?
-            var mc = Minecraft.getInstance();
+                camera
-            var font = this.font;
+            );
-
-            transform.pushPose();
-            transform.translate(0.5, 1.2, 0.5);
-            transform.mulPose(mc.getEntityRenderDispatcher().cameraOrientation());
-            transform.scale(0.025f, -0.025f, 0.025f);
-
-            var matrix = transform.last().pose();
-            var opacity = (int) (mc.options.getBackgroundOpacity(0.25f) * 255) << 24;
-            var width = -font.width(label) / 2.0f;
-            font.drawInBatch(label, width, 0, 0x20ffffff, false, matrix, buffers, Font.DisplayMode.SEE_THROUGH, opacity, lightmapCoord);
-            font.drawInBatch(label, width, 0, CommonColors.WHITE, false, matrix, buffers, Font.DisplayMode.NORMAL, 0, lightmapCoord);
-
-            transform.popPose();
         }
 
         // Then apply rotation and flip if needed.
         transform.translate(0.5f, 0.5f, 0.5f);
-        var yaw = turtle.getRenderYaw(partialTicks);
+        transform.mulPose(Axis.YP.rotationDegrees(180.0f - state.yaw));
-        transform.mulPose(Axis.YP.rotationDegrees(180.0f - yaw));
         transform.translate(-0.5f, -0.5f, -0.5f);
 
-        // Render the turtle
+        state.model.submit(transform, collector, state.lightCoords, OverlayTexture.NO_OVERLAY, state.colour == -1 ? null : new int[]{ ARGB.opaque(state.colour) }, state.breakProgress);
-        var colour = turtle.getColour();
-        var overlay = TurtleOverlayManager.get(Minecraft.getInstance().getModelManager(), turtle.getOverlay());
 
-        if (colour == -1) {
+        if (state.overlay != null) {
-            renderModel(transform, buffers, lightmapCoord, overlayLight, turtle.getFamily() == ComputerFamily.NORMAL ? NORMAL_TURTLE_MODEL : ADVANCED_TURTLE_MODEL, null);
+            state.overlay.submit(transform, collector, state.lightCoords, OverlayTexture.NO_OVERLAY);
-        } else {
+        }
-            // Otherwise render it using the colour item.
+        if (state.elfOverlay != null) {
-            renderModel(transform, buffers, lightmapCoord, overlayLight, COLOUR_TURTLE_MODEL, new int[]{ ARGB.opaque(colour) });
+            state.elfOverlay.submit(transform, collector, state.lightCoords, OverlayTexture.NO_OVERLAY);
         }
 
-        // Render the overlay
+        submitUpgrade(transform, collector, state.lightCoords, state.leftAngle, state.leftUpgrade);
-        if (overlay != null) overlay.model().render(transform, buffers, lightmapCoord, overlayLight);
+        submitUpgrade(transform, collector, state.lightCoords, state.rightAngle, state.rightUpgrade);
-
-        // And the Christmas overlay.
-        var showChristmas = Holiday.getCurrent() == Holiday.CHRISTMAS && (overlay == null || overlay.showElfOverlay());
-        if (showChristmas) renderModel(transform, buffers, lightmapCoord, overlayLight, TurtleOverlay.ELF_MODEL, null);
-
-        // Render the upgrades
-        renderUpgrade(transform, buffers, lightmapCoord, overlayLight, turtle, TurtleSide.LEFT, partialTicks);
-        renderUpgrade(transform, buffers, lightmapCoord, overlayLight, turtle, TurtleSide.RIGHT, partialTicks);
 
         transform.popPose();
     }
 
-    private void renderUpgrade(PoseStack transform, MultiBufferSource buffers, int lightmapCoord, int overlayLight, TurtleBlockEntity turtle, TurtleSide side, float f) {
+    private void submitUpgrade(PoseStack transform, SubmitNodeCollector collector, int lightmapCoord, float angle, ItemStackRenderState state) {
-        var upgrade = turtle.getAccess().getUpgradeWithData(side);
+        if (state.isEmpty()) return;
-        if (upgrade == null) return;
         transform.pushPose();
 
-        var toolAngle = turtle.getToolRenderAngle(side, f);
+        // Swing the tool
         transform.translate(0.0f, 0.5f, 0.5f);
-        transform.mulPose(Axis.XN.rotationDegrees(toolAngle));
+        transform.mulPose(Axis.XN.rotationDegrees(angle));
         transform.translate(0.0f, -0.5f, -0.5f);
 
-        TurtleUpgradeModelManager.get(Minecraft.getInstance().getModelManager(), upgrade.holder())
+        // Then reposition for rendering the item
-            .renderForLevel(upgrade, side, turtle.getAccess(), transform, buffers, lightmapCoord, overlayLight);
+        transform.translate(0.5f, 0.5f, 0.5f);
+        state.submit(transform, collector, lightmapCoord, OverlayTexture.NO_OVERLAY, 0);
 
         transform.popPose();
     }
-
-    private void renderModel(PoseStack transform, MultiBufferSource buffers, int lightmapCoord, int overlayLight, ResourceLocation modelLocation, int @Nullable [] tints) {
-        var modelManager = Minecraft.getInstance().getModelManager();
-        ClientRegistry.getModel(modelManager, modelLocation).render(transform, buffers, lightmapCoord, overlayLight, tints);
-    }
-
 }

projects/common/src/client/java/dan200/computercraft/client/render/monitor/MonitorBlockEntityRenderer.java

@@ -4,104 +4,81 @@
 
 package dan200.computercraft.client.render.monitor;
 
-import com.mojang.blaze3d.buffers.GpuBuffer;
-import com.mojang.blaze3d.pipeline.RenderPipeline;
-import com.mojang.blaze3d.systems.RenderSystem;
 import com.mojang.blaze3d.vertex.PoseStack;
 import com.mojang.math.Axis;
 import dan200.computercraft.annotations.ForgeOverride;
-import dan200.computercraft.client.FrameInfo;
-import dan200.computercraft.client.integration.ShaderMod;
-import dan200.computercraft.client.render.text.DirectFixedWidthFontRenderer;
 import dan200.computercraft.client.render.text.FixedWidthFontRenderer;
-import dan200.computercraft.core.terminal.Terminal;
 import dan200.computercraft.shared.config.Config;
 import dan200.computercraft.shared.peripheral.monitor.ClientMonitor;
 import dan200.computercraft.shared.peripheral.monitor.MonitorBlockEntity;
 import dan200.computercraft.shared.util.DirectionUtil;
-import net.minecraft.client.Minecraft;
+import net.minecraft.client.renderer.SubmitNodeCollector;
-import net.minecraft.client.renderer.MultiBufferSource;
-import net.minecraft.client.renderer.RenderPipelines;
-import net.minecraft.client.renderer.RenderType;
 import net.minecraft.client.renderer.blockentity.BlockEntityRenderer;
 import net.minecraft.client.renderer.blockentity.BlockEntityRendererProvider;
-import net.minecraft.client.renderer.fog.FogRenderer;
+import net.minecraft.client.renderer.blockentity.state.BlockEntityRenderState;
+import net.minecraft.client.renderer.feature.ModelFeatureRenderer;
+import net.minecraft.client.renderer.state.CameraRenderState;
+import net.minecraft.core.Direction;
 import net.minecraft.world.phys.AABB;
 import net.minecraft.world.phys.Vec3;
-import org.joml.Matrix4f;
-import org.joml.Vector4f;
 import org.jspecify.annotations.Nullable;
-import org.lwjgl.system.MemoryUtil;
-
-import java.nio.ByteBuffer;
-import java.util.OptionalDouble;
-import java.util.OptionalInt;
 
 import static dan200.computercraft.client.render.text.FixedWidthFontRenderer.FONT_HEIGHT;
 import static dan200.computercraft.client.render.text.FixedWidthFontRenderer.FONT_WIDTH;
 
-public class MonitorBlockEntityRenderer implements BlockEntityRenderer<MonitorBlockEntity> {
+public class MonitorBlockEntityRenderer implements BlockEntityRenderer<MonitorBlockEntity, MonitorBlockEntityRenderer.State> {
     /**
      * {@link MonitorBlockEntity#RENDER_MARGIN}, but a tiny bit of additional padding to ensure that there is no space between
      * the monitor frame and contents.
      */
     private static final float MARGIN = (float) (MonitorBlockEntity.RENDER_MARGIN * 1.1);
 
-    private static @Nullable ByteBuffer backingBuffer;
-
     public MonitorBlockEntityRenderer(BlockEntityRendererProvider.Context context) {
     }
 
     @Override
-    public void render(MonitorBlockEntity monitor, float partialTicks, PoseStack transform, MultiBufferSource bufferSource, int lightmapCoord, int overlayLight, Vec3 camera) {
+    public State createRenderState() {
-        // Render from the origin monitor
+        return new State();
-        var originTerminal = monitor.getOriginClientMonitor();
+    }
-        if (originTerminal == null) return;
 
-        var origin = originTerminal.getOrigin();
+    @Override
-        var renderState = originTerminal.getRenderState(MonitorRenderState::new);
+    public void extractRenderState(MonitorBlockEntity monitor, State state, float f, Vec3 camera, ModelFeatureRenderer.@Nullable CrumblingOverlay crumblingOverlay) {
-        var monitorPos = monitor.getBlockPos();
+        BlockEntityRenderer.super.extractRenderState(monitor, state, f, camera, crumblingOverlay);
 
-        // Ensure each monitor terminal is rendered only once. We allow rendering a specific tile
+        state.direction = monitor.getDirection();
-        // multiple times in a single frame to ensure compatibility with shaders which may run a
+        state.front = monitor.getFront();
-        // pass multiple times.
+        state.width = monitor.getWidth();
-        var renderFrame = FrameInfo.getRenderFrame();
+        state.height = monitor.getHeight();
-        if (renderState.lastRenderFrame == renderFrame && !monitorPos.equals(renderState.lastRenderPos)) {
+        state.terminal = monitor.getOriginClientMonitor();
-            return;
+    }
-        }
 
-        renderState.lastRenderFrame = renderFrame;
+    @Override
-        renderState.lastRenderPos = monitorPos;
+    public void submit(State state, PoseStack transform, SubmitNodeCollector collector, CameraRenderState camera) {
-
+        if (state.terminal == null) return;
-        var originPos = origin.getBlockPos();
 
         // Determine orientation
-        var dir = origin.getDirection();
+        var dir = state.direction;
-        var front = origin.getFront();
+        var front = state.front;
         var yaw = dir.toYRot();
         var pitch = DirectionUtil.toPitchAngle(front);
 
         // Setup initial transform
         transform.pushPose();
-        transform.translate(
+        transform.translate(0.5, 0.5, 0.5);
-            originPos.getX() - monitorPos.getX() + 0.5,
-            originPos.getY() - monitorPos.getY() + 0.5,
-            originPos.getZ() - monitorPos.getZ() + 0.5
-        );
 
         transform.mulPose(Axis.YN.rotationDegrees(yaw));
         transform.mulPose(Axis.XP.rotationDegrees(pitch));
         transform.translate(
             -0.5 + MonitorBlockEntity.RENDER_BORDER + MonitorBlockEntity.RENDER_MARGIN,
-            origin.getHeight() - 0.5 - (MonitorBlockEntity.RENDER_BORDER + MonitorBlockEntity.RENDER_MARGIN) + 0,
+            state.height - 0.5 - (MonitorBlockEntity.RENDER_BORDER + MonitorBlockEntity.RENDER_MARGIN) + 0,
             0.5
         );
-        var xSize = origin.getWidth() - 2.0 * (MonitorBlockEntity.RENDER_MARGIN + MonitorBlockEntity.RENDER_BORDER);
+        var xSize = state.width - 2.0 * (MonitorBlockEntity.RENDER_MARGIN + MonitorBlockEntity.RENDER_BORDER);
-        var ySize = origin.getHeight() - 2.0 * (MonitorBlockEntity.RENDER_MARGIN + MonitorBlockEntity.RENDER_BORDER);
+        var ySize = state.height - 2.0 * (MonitorBlockEntity.RENDER_MARGIN + MonitorBlockEntity.RENDER_BORDER);
 
         // Draw the contents
-        var terminal = originTerminal.getTerminal();
+        var terminal = state.terminal.getTerminal();
-        if (terminal != null && !ShaderMod.get().isRenderingShadowPass()) {
+        if (terminal != null) {
             // Draw a terminal
             int width = terminal.getWidth(), height = terminal.getHeight();
             int pixelWidth = width * FONT_WIDTH, pixelHeight = height * FONT_HEIGHT;
@@ -110,158 +87,25 @@ public class MonitorBlockEntityRenderer implements BlockEntityRenderer<MonitorBl
             transform.pushPose();
             transform.scale((float) xScale, (float) -yScale, 1.0f);
 
-            var matrix = transform.last().pose();
+            var xMargin = (float) (MARGIN / xScale);
+            var yMargin = (float) (MARGIN / yScale);
 
-            renderTerminal(matrix, originTerminal, renderState, terminal, (float) (MARGIN / xScale), (float) (MARGIN / yScale));
+            collector.submitCustomGeometry(transform, FixedWidthFontRenderer.TERMINAL_TEXT, (pose, buffer) -> {
+                FixedWidthFontRenderer.drawTerminalBackground(pose.pose(), buffer, 0, 0, terminal, yMargin, yMargin, xMargin, xMargin);
+            });
+            collector.submitCustomGeometry(transform, FixedWidthFontRenderer.TERMINAL_TEXT_OFFSET, (pose, buffer) -> {
+                FixedWidthFontRenderer.drawTerminalForeground(pose.pose(), buffer, 0, 0, terminal);
+                FixedWidthFontRenderer.drawCursor(pose.pose(), buffer, 0, 0, terminal);
+            });
 
             transform.popPose();
         } else {
-            FixedWidthFontRenderer.drawEmptyTerminal(
+            FixedWidthFontRenderer.drawEmptyTerminal(transform, collector, -MARGIN, MARGIN, (float) (xSize + 2 * MARGIN), (float) -(ySize + MARGIN * 2));
-                FixedWidthFontRenderer.toVertexConsumer(transform, bufferSource.getBuffer(FixedWidthFontRenderer.TERMINAL_TEXT)),
-                -MARGIN, MARGIN,
-                (float) (xSize + 2 * MARGIN), (float) -(ySize + MARGIN * 2)
-            );
         }
 
         transform.popPose();
     }
 
-    private static void renderTerminal(
-        Matrix4f matrix, ClientMonitor monitor, MonitorRenderState renderState, Terminal terminal, float xMargin, float yMargin
-    ) {
-        var redraw = monitor.pollTerminalChanged();
-        if (renderState.vertexBuffer == null) redraw = true;
-
-        if (redraw) {
-            // Cursor, Foreground, Background+Margin
-            var maxQuadCount = 1 + (terminal.getWidth() * terminal.getHeight()) + ((terminal.getWidth() + 2) * (terminal.getHeight() + 2));
-            var maxVertexCount = 4 * maxQuadCount;
-            var sink = ShaderMod.get().getQuadEmitter(maxQuadCount, MonitorBlockEntityRenderer::getBuffer);
-
-            DirectFixedWidthFontRenderer.drawTerminalBackground(sink, 0, 0, terminal, yMargin, yMargin, xMargin, xMargin);
-            var vertexCountAfterBackground = sink.vertexCount();
-
-            DirectFixedWidthFontRenderer.drawTerminalForeground(sink, 0, 0, terminal);
-            var vertexCountAfterForeground = sink.vertexCount();
-
-            DirectFixedWidthFontRenderer.drawCursor(sink, 0, 0, terminal);
-            var vertexCountAfterCursor = sink.vertexCount();
-
-            if (vertexCountAfterCursor > maxVertexCount) {
-                throw new IllegalStateException("Drew too many vertices. Expected " + maxVertexCount + ", drew " + vertexCountAfterCursor);
-            }
-
-            if (vertexCountAfterCursor != 0) {
-                renderState.register();
-
-                var commandEncoder = RenderSystem.getDevice().createCommandEncoder();
-
-                var resultBuffer = sink.byteBuffer().flip();
-
-                // Ensure our buffer contains the correct number of vertices.
-                if (resultBuffer.remaining() != sink.format().getVertexSize() * vertexCountAfterCursor) {
-                    throw new IllegalStateException(String.format(
-                        "Mismatched vertex count. Buffer is %d bytes long, but was expected to be %d (vertex size) * %d (vertex count) = %d bytes.",
-                        resultBuffer.limit(), sink.format().getVertexSize(), vertexCountAfterCursor, sink.format().getVertexSize() * vertexCountAfterCursor
-                    ));
-                }
-
-                // Upload the buffer, reallocating if required.
-                if (renderState.vertexBuffer == null || resultBuffer.remaining() > renderState.vertexBuffer.size()) {
-                    if (renderState.vertexBuffer != null) {
-                        renderState.vertexBuffer.close();
-                        renderState.vertexBuffer = null;
-                    }
-                    renderState.vertexBuffer = RenderSystem.getDevice().createBuffer(
-                        () -> "Monitor at " + monitor.getOrigin().getBlockPos(), GpuBuffer.USAGE_VERTEX | GpuBuffer.USAGE_COPY_DST, resultBuffer
-                    );
-                } else if (!renderState.vertexBuffer.isClosed()) {
-                    commandEncoder.writeToBuffer(renderState.vertexBuffer.slice(), resultBuffer);
-                }
-            }
-
-            renderState.vertexCountAfterBackground = vertexCountAfterBackground;
-            renderState.vertexCountAfterForeground = vertexCountAfterForeground;
-            renderState.vertexCountAfterCursor = vertexCountAfterCursor;
-        }
-
-        if (renderState.vertexCountAfterCursor == 0) return;
-
-        // Our VBO renders coordinates in monitor-space rather than world space. A full sized monitor (8x6) will
-        // use positions from (0, 0) to (164*FONT_WIDTH, 81*FONT_HEIGHT) = (984, 729). This is far outside the
-        // normal render distance (~200), and the edges of the monitor fade out due to fog.
-        // There's not really a good way around this, at least without using a custom render type (which the VBO
-        // renderer is trying to avoid!). Instead, we just disable fog entirely by setting the fog start to an
-        // absurdly high value.
-        var oldFog = RenderSystem.getShaderFog();
-        RenderSystem.setShaderFog(Minecraft.getInstance().gameRenderer.fogRenderer.getBuffer(FogRenderer.FogMode.NONE));
-
-        // Compose the existing model view matrix with our transformation matrix.
-        RenderSystem.getModelViewStack().pushMatrix();
-        RenderSystem.getModelViewStack().mul(matrix);
-
-        // Render background geometry
-        drawWithShader(renderState, FixedWidthFontRenderer.TERMINAL_TEXT, RenderPipelines.TEXT, 0, renderState.vertexCountAfterBackground);
-        drawWithShader(
-            renderState, FixedWidthFontRenderer.TERMINAL_TEXT_OFFSET, RenderPipelines.TEXT_POLYGON_OFFSET, renderState.vertexCountAfterBackground,
-            (
-                FixedWidthFontRenderer.isCursorVisible(terminal) && FrameInfo.getGlobalCursorBlink()
-                    ? renderState.vertexCountAfterCursor : renderState.vertexCountAfterForeground
-            ) - renderState.vertexCountAfterBackground
-        );
-
-        // Clear state
-        RenderSystem.getModelViewStack().popMatrix();
-        RenderSystem.setShaderFog(oldFog);
-    }
-
-    private static void drawWithShader(MonitorRenderState renderState, RenderType renderType, RenderPipeline pipeline, int vertexOffset, int vertexCount) {
-        if (renderState.vertexBuffer == null) {
-            throw new IllegalStateException("MonitorRenderState has not been initialised");
-        }
-        if (vertexCount == 0) return;
-
-        var transforms = RenderSystem.getDynamicUniforms().writeTransform(
-            RenderSystem.getModelViewMatrix(),
-            new Vector4f(1.0F, 1.0F, 1.0F, 1.0F),
-            RenderSystem.getModelOffset(),
-            RenderSystem.getTextureMatrix(),
-            RenderSystem.getShaderLineWidth()
-        );
-
-        renderType.setupRenderState();
-
-        var autoStorageBuffer = RenderSystem.getSequentialBuffer(renderType.mode());
-        var indexCount = FixedWidthFontRenderer.TERMINAL_TEXT.mode().indexCount(vertexCount);
-        var indexBuffer = autoStorageBuffer.getBuffer(indexCount);
-
-        var target = Minecraft.getInstance().getMainRenderTarget();
-        var colourTarget = RenderSystem.outputColorTextureOverride != null ? RenderSystem.outputColorTextureOverride : target.getColorTextureView();
-        var depthTarget = target.useDepth
-            ? (RenderSystem.outputDepthTextureOverride != null ? RenderSystem.outputDepthTextureOverride : target.getDepthTextureView())
-            : null;
-
-        try (var renderPass = RenderSystem.getDevice().createCommandEncoder().createRenderPass(
-            () -> "Monitor", colourTarget, OptionalInt.empty(), depthTarget, OptionalDouble.empty()
-        )) {
-            renderPass.setPipeline(pipeline);
-
-            RenderSystem.bindDefaultUniforms(renderPass);
-            renderPass.setUniform("DynamicTransforms", transforms);
-            renderPass.setVertexBuffer(0, renderState.vertexBuffer);
-            renderPass.setIndexBuffer(indexBuffer, autoStorageBuffer.type());
-
-            for (var j = 0; j < 12; j++) {
-                var gpuTexture = RenderSystem.getShaderTexture(j);
-                if (gpuTexture != null) renderPass.bindSampler("Sampler" + j, gpuTexture);
-            }
-
-            renderPass.drawIndexed(vertexOffset, 0, indexCount, 1);
-        }
-
-        renderType.clearRenderState();
-    }
-
     @Override
     public int getViewDistance() {
         return Config.monitorDistance;
@@ -272,13 +116,19 @@ public class MonitorBlockEntityRenderer implements BlockEntityRenderer<MonitorBl
         return monitor.getRenderBoundingBox();
     }
 
-    private static ByteBuffer getBuffer(int capacity) {
+    @Override
-        var buffer = backingBuffer;
+    public boolean shouldRender(MonitorBlockEntity monitor, Vec3 camera) {
-        if (buffer == null || buffer.capacity() < capacity) {
+        return BlockEntityRenderer.super.shouldRender(monitor, camera) && monitor.getXIndex() == 0 && monitor.getYIndex() == 0;
-            buffer = backingBuffer = buffer == null ? MemoryUtil.memAlloc(capacity) : MemoryUtil.memRealloc(buffer, capacity);
+    }
-        }
 
-        buffer.clear();
+    public static final class State extends BlockEntityRenderState {
-        return buffer;
+        private Direction direction = Direction.NORTH;
+        private Direction front = Direction.NORTH;
+        private int width;
+        private int height;
+        private @Nullable ClientMonitor terminal;
+
+        private State() {
+        }
     }
 }

projects/common/src/client/java/dan200/computercraft/client/render/text/FixedWidthFontRenderer.java

@@ -13,6 +13,7 @@ import dan200.computercraft.core.terminal.TextBuffer;
 import dan200.computercraft.core.util.Colour;
 import net.minecraft.client.renderer.LightTexture;
 import net.minecraft.client.renderer.RenderType;
+import net.minecraft.client.renderer.SubmitNodeCollector;
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.util.ARGB;
 import org.joml.Matrix4f;
@@ -67,7 +68,7 @@ public final class FixedWidthFontRenderer {
         return 15 - Terminal.getColour(c, def);
     }
 
-    private static void drawChar(QuadEmitter emitter, float x, float y, int index, int colour, int light) {
+    private static void drawChar(Matrix4f matrix, VertexConsumer buffer, float x, float y, int index, int colour, int light) {
         // Short circuit to avoid the common case - the texture should be blank here after all.
         if (index == '\0' || index == ' ') return;
 
@@ -78,30 +79,30 @@ public final class FixedWidthFontRenderer {
         var yStart = 1 + row * (FONT_HEIGHT + 2);
 
         quad(
-            emitter, x, y, x + FONT_WIDTH, y + FONT_HEIGHT, 0, colour,
+            matrix, buffer, x, y, x + FONT_WIDTH, y + FONT_HEIGHT, 0, colour,
             xStart / WIDTH, yStart / WIDTH, (xStart + FONT_WIDTH) / WIDTH, (yStart + FONT_HEIGHT) / WIDTH, light
         );
     }
 
-    public static void drawQuad(QuadEmitter emitter, float x, float y, float z, float width, float height, int colour, int light) {
+    public static void drawQuad(Matrix4f matrix, VertexConsumer buffer, float x, float y, float z, float width, float height, int colour, int light) {
-        quad(emitter, x, y, x + width, y + height, z, colour, BACKGROUND_START, BACKGROUND_START, BACKGROUND_END, BACKGROUND_END, light);
+        quad(matrix, buffer, x, y, x + width, y + height, z, colour, BACKGROUND_START, BACKGROUND_START, BACKGROUND_END, BACKGROUND_END, light);
     }
 
-    private static void drawQuad(QuadEmitter emitter, float x, float y, float width, float height, Palette palette, char colourIndex, int light) {
+    private static void drawQuad(Matrix4f matrix, VertexConsumer buffer, float x, float y, float width, float height, Palette palette, char colourIndex, int light) {
         var colour = palette.getRenderColours(getColour(colourIndex, Colour.BLACK));
-        drawQuad(emitter, x, y, 0, width, height, colour, light);
+        drawQuad(matrix, buffer, x, y, 0, width, height, colour, light);
     }
 
     private static void drawBackground(
-        QuadEmitter emitter, float x, float y, TextBuffer backgroundColour, Palette palette,
+        Matrix4f matrix, VertexConsumer buffer, float x, float y, TextBuffer backgroundColour, Palette palette,
         float leftMarginSize, float rightMarginSize, float height, int light
     ) {
         if (leftMarginSize > 0) {
-            drawQuad(emitter, x - leftMarginSize, y, leftMarginSize, height, palette, backgroundColour.charAt(0), light);
+            drawQuad(matrix, buffer, x - leftMarginSize, y, leftMarginSize, height, palette, backgroundColour.charAt(0), light);
         }
 
         if (rightMarginSize > 0) {
-            drawQuad(emitter, x + backgroundColour.length() * FONT_WIDTH, y, rightMarginSize, height, palette, backgroundColour.charAt(backgroundColour.length() - 1), light);
+            drawQuad(matrix, buffer, x + backgroundColour.length() * FONT_WIDTH, y, rightMarginSize, height, palette, backgroundColour.charAt(backgroundColour.length() - 1), light);
         }
 
         // Batch together runs of identical background cells.
@@ -112,7 +113,7 @@ public final class FixedWidthFontRenderer {
             if (colourIndex == blockColour) continue;
 
             if (blockColour != '\0') {
-                drawQuad(emitter, x + blockStart * FONT_WIDTH, y, FONT_WIDTH * (i - blockStart), height, palette, blockColour, light);
+                drawQuad(matrix, buffer, x + blockStart * FONT_WIDTH, y, FONT_WIDTH * (i - blockStart), height, palette, blockColour, light);
             }
 
             blockColour = colourIndex;
@@ -120,22 +121,22 @@ public final class FixedWidthFontRenderer {
         }
 
         if (blockColour != '\0') {
-            drawQuad(emitter, x + blockStart * FONT_WIDTH, y, FONT_WIDTH * (backgroundColour.length() - blockStart), height, palette, blockColour, light);
+            drawQuad(matrix, buffer, x + blockStart * FONT_WIDTH, y, FONT_WIDTH * (backgroundColour.length() - blockStart), height, palette, blockColour, light);
         }
     }
 
-    public static void drawString(QuadEmitter emitter, float x, float y, TextBuffer text, TextBuffer textColour, Palette palette, int light) {
+    public static void drawString(Matrix4f matrix, VertexConsumer buffer, float x, float y, TextBuffer text, TextBuffer textColour, Palette palette, int light) {
         for (var i = 0; i < text.length(); i++) {
             var colour = palette.getRenderColours(getColour(textColour.charAt(i), Colour.BLACK));
 
             int index = text.charAt(i);
             if (index > 255) index = '?';
-            drawChar(emitter, x + i * FONT_WIDTH, y, index, colour, light);
+            drawChar(matrix, buffer, x + i * FONT_WIDTH, y, index, colour, light);
         }
 
     }
 
-    public static void drawTerminalForeground(QuadEmitter emitter, float x, float y, Terminal terminal) {
+    public static void drawTerminalForeground(Matrix4f matrix, VertexConsumer buffer, float x, float y, Terminal terminal) {
         var palette = terminal.getPalette();
         var height = terminal.getHeight();
 
@@ -143,14 +144,14 @@ public final class FixedWidthFontRenderer {
         for (var i = 0; i < height; i++) {
             var rowY = y + FONT_HEIGHT * i;
             drawString(
-                emitter, x, rowY, terminal.getLine(i), terminal.getTextColourLine(i),
+                matrix, buffer, x, rowY, terminal.getLine(i), terminal.getTextColourLine(i),
                 palette, LightTexture.FULL_BRIGHT
             );
         }
     }
 
     public static void drawTerminalBackground(
-        QuadEmitter emitter, float x, float y, Terminal terminal,
+        Matrix4f matrix, VertexConsumer buffer, float x, float y, Terminal terminal,
         float topMarginSize, float bottomMarginSize, float leftMarginSize, float rightMarginSize
     ) {
         var palette = terminal.getPalette();
@@ -158,12 +159,12 @@ public final class FixedWidthFontRenderer {
 
         // Top and bottom margins
         drawBackground(
-            emitter, x, y - topMarginSize, terminal.getBackgroundColourLine(0), palette,
+            matrix, buffer, x, y - topMarginSize, terminal.getBackgroundColourLine(0), palette,
             leftMarginSize, rightMarginSize, topMarginSize, LightTexture.FULL_BRIGHT
         );
 
         drawBackground(
-            emitter, x, y + height * FONT_HEIGHT, terminal.getBackgroundColourLine(height - 1), palette,
+            matrix, buffer, x, y + height * FONT_HEIGHT, terminal.getBackgroundColourLine(height - 1), palette,
             leftMarginSize, rightMarginSize, bottomMarginSize, LightTexture.FULL_BRIGHT
         );
 
@@ -171,7 +172,7 @@ public final class FixedWidthFontRenderer {
         for (var i = 0; i < height; i++) {
             var rowY = y + FONT_HEIGHT * i;
             drawBackground(
-                emitter, x, rowY, terminal.getBackgroundColourLine(i), palette,
+                matrix, buffer, x, rowY, terminal.getBackgroundColourLine(i), palette,
                 leftMarginSize, rightMarginSize, FONT_HEIGHT, LightTexture.FULL_BRIGHT
             );
         }
@@ -185,52 +186,40 @@ public final class FixedWidthFontRenderer {
         return cursorX >= 0 && cursorX < terminal.getWidth() && cursorY >= 0 && cursorY < terminal.getHeight();
     }
 
-    public static void drawCursor(QuadEmitter emitter, float x, float y, Terminal terminal) {
+    public static void drawCursor(Matrix4f matrix, VertexConsumer buffer, float x, float y, Terminal terminal) {
         if (isCursorVisible(terminal) && FrameInfo.getGlobalCursorBlink()) {
             var colour = terminal.getPalette().getRenderColours(15 - terminal.getTextColour());
-            drawChar(emitter, x + terminal.getCursorX() * FONT_WIDTH, y + terminal.getCursorY() * FONT_HEIGHT, '_', colour, LightTexture.FULL_BRIGHT);
+            drawChar(matrix, buffer, x + terminal.getCursorX() * FONT_WIDTH, y + terminal.getCursorY() * FONT_HEIGHT, '_', colour, LightTexture.FULL_BRIGHT);
         }
     }
 
     public static void drawTerminal(
-        QuadEmitter emitter, float x, float y, Terminal terminal,
+        Matrix4f matrix, VertexConsumer buffer, float x, float y, Terminal terminal,
         float topMarginSize, float bottomMarginSize, float leftMarginSize, float rightMarginSize
     ) {
         drawTerminalBackground(
-            emitter, x, y, terminal,
+            matrix, buffer, x, y, terminal,
             topMarginSize, bottomMarginSize, leftMarginSize, rightMarginSize
         );
 
         // Render the foreground with a slight offset. By calling .translate() on the matrix itself, we're translating
         // in screen space, rather than in model/view space.
         // It's definitely not perfect, but better than z fighting!
-        var transformBackup = new Matrix4f(emitter.poseMatrix());
+        var offsetMatrix = new Matrix4f(matrix).translate(new Vector3f(0, 0, Z_OFFSET));
-        emitter.poseMatrix().translate(new Vector3f(0, 0, Z_OFFSET));
 
-        drawTerminalForeground(emitter, x, y, terminal);
+        drawTerminalForeground(offsetMatrix, buffer, x, y, terminal);
-        drawCursor(emitter, x, y, terminal);
+        drawCursor(offsetMatrix, buffer, x, y, terminal);
-
-        emitter.poseMatrix().set(transformBackup);
     }
 
-    public static void drawEmptyTerminal(QuadEmitter emitter, float x, float y, float width, float height) {
+    public static void drawEmptyTerminal(PoseStack transform, SubmitNodeCollector collector, float x, float y, float width, float height) {
-        drawQuad(emitter, x, y, 0, width, height, BLACK, LightTexture.FULL_BRIGHT);
+        collector.submitCustomGeometry(transform, FixedWidthFontRenderer.TERMINAL_TEXT, (pose, buffer) ->
+            drawQuad(pose.pose(), buffer, x, y, 0, width, height, BLACK, LightTexture.FULL_BRIGHT));
     }
 
-    public record QuadEmitter(Matrix4f poseMatrix, VertexConsumer consumer) {
+    private static void quad(Matrix4f matrix, VertexConsumer buffer, float x1, float y1, float x2, float y2, float z, int colour, float u1, float v1, float u2, float v2, int light) {
-    }
+        buffer.addVertex(matrix, x1, y1, z).setColor(colour).setUv(u1, v1).setLight(light);
-
+        buffer.addVertex(matrix, x1, y2, z).setColor(colour).setUv(u1, v2).setLight(light);
-    public static QuadEmitter toVertexConsumer(PoseStack transform, VertexConsumer consumer) {
+        buffer.addVertex(matrix, x2, y2, z).setColor(colour).setUv(u2, v2).setLight(light);
-        return new QuadEmitter(transform.last().pose(), consumer);
+        buffer.addVertex(matrix, x2, y1, z).setColor(colour).setUv(u2, v1).setLight(light);
-    }
-
-    private static void quad(QuadEmitter c, float x1, float y1, float x2, float y2, float z, int colour, float u1, float v1, float u2, float v2, int light) {
-        var poseMatrix = c.poseMatrix();
-        var consumer = c.consumer();
-
-        consumer.addVertex(poseMatrix, x1, y1, z).setColor(colour).setUv(u1, v1).setLight(light);
-        consumer.addVertex(poseMatrix, x1, y2, z).setColor(colour).setUv(u1, v2).setLight(light);
-        consumer.addVertex(poseMatrix, x2, y2, z).setColor(colour).setUv(u2, v2).setLight(light);
-        consumer.addVertex(poseMatrix, x2, y1, z).setColor(colour).setUv(u2, v1).setLight(light);
     }
 }

projects/common/src/datagen/java/dan200/computercraft/data/DataProviders.java

@@ -10,7 +10,7 @@ import dan200.computercraft.api.pocket.IPocketUpgrade;
 import dan200.computercraft.api.turtle.ITurtleUpgrade;
 import dan200.computercraft.client.gui.GuiSprites;
 import dan200.computercraft.client.model.LecternPocketModel;
-import dan200.computercraft.client.model.LecternPrintoutModel;
+import dan200.computercraft.client.model.LecternPrintoutModelDefinitions;
 import dan200.computercraft.client.turtle.TurtleOverlay;
 import dan200.computercraft.data.client.BlockModelProvider;
 import dan200.computercraft.data.client.ItemModelProvider;
@@ -21,9 +21,9 @@ import net.minecraft.client.data.models.ItemModelGenerators;
 import net.minecraft.client.renderer.texture.atlas.SpriteSource;
 import net.minecraft.client.renderer.texture.atlas.SpriteSources;
 import net.minecraft.client.renderer.texture.atlas.sources.SingleFile;
-import net.minecraft.client.resources.model.AtlasIds;
 import net.minecraft.core.HolderLookup;
 import net.minecraft.core.RegistrySetBuilder;
+import net.minecraft.data.AtlasIds;
 import net.minecraft.data.DataProvider;
 import net.minecraft.data.PackOutput;
 import net.minecraft.data.registries.RegistryPatchGenerator;
@@ -71,9 +71,9 @@ public final class DataProviders {
 
         generator.addFromCodec("Block atlases", PackOutput.Target.RESOURCE_PACK, "atlases", SpriteSources.FILE_CODEC, out -> {
             out.accept(AtlasIds.BLOCKS, makeSprites(Stream.of(
-                LecternPrintoutModel.TEXTURE,
+                LecternPrintoutModelDefinitions.MATERIAL.texture(),
-                LecternPocketModel.TEXTURE_NORMAL, LecternPocketModel.TEXTURE_ADVANCED,
+                LecternPocketModel.MATERIAL_NORMAL.texture(), LecternPocketModel.MATERIAL_ADVANCED.texture(),
-                LecternPocketModel.TEXTURE_COLOUR, LecternPocketModel.TEXTURE_FRAME, LecternPocketModel.TEXTURE_LIGHT
+                LecternPocketModel.MATERIAL_COLOUR.texture(), LecternPocketModel.MATERIAL_FRAME.texture(), LecternPocketModel.MATERIAL_LIGHT.texture()
             )));
 
             out.accept(AtlasIds.GUI, makeSprites(

projects/common/src/datagen/java/dan200/computercraft/data/LootTableProvider.java

@@ -23,6 +23,7 @@ import net.minecraft.world.level.storage.loot.entries.LootPoolEntryContainer;
 import net.minecraft.world.level.storage.loot.functions.CopyComponentsFunction;
 import net.minecraft.world.level.storage.loot.functions.CopyNameFunction;
 import net.minecraft.world.level.storage.loot.parameters.LootContextParamSets;
+import net.minecraft.world.level.storage.loot.parameters.LootContextParams;
 import net.minecraft.world.level.storage.loot.predicates.AnyOfCondition;
 import net.minecraft.world.level.storage.loot.predicates.ExplosionCondition;
 import net.minecraft.world.level.storage.loot.predicates.LootItemBlockStatePropertyCondition;
@@ -92,7 +93,7 @@ class LootTableProvider {
     private static void namedBlockDrop(BiConsumer<ResourceKey<LootTable>, LootTable.Builder> add, Supplier<? extends Block> wrapper) {
         blockDrop(
             add, wrapper,
-            LootItem.lootTableItem(wrapper.get()).apply(CopyNameFunction.copyName(CopyNameFunction.NameSource.BLOCK_ENTITY)),
+            LootItem.lootTableItem(wrapper.get()).apply(CopyNameFunction.copyName(new CopyNameFunction.Source(LootContextParams.BLOCK_ENTITY))),
             ExplosionCondition.survivesExplosion()
         );
     }
@@ -100,7 +101,7 @@ class LootTableProvider {
     private static void computerDrop(BiConsumer<ResourceKey<LootTable>, LootTable.Builder> add, Supplier<? extends Block> block) {
         blockDrop(
             add, block,
-            LootItem.lootTableItem(block.get()).apply(CopyComponentsFunction.copyComponents(CopyComponentsFunction.Source.BLOCK_ENTITY)),
+            LootItem.lootTableItem(block.get()).apply(CopyComponentsFunction.copyComponentsFromBlockEntity(LootContextParams.BLOCK_ENTITY)),
             AnyOfCondition.anyOf(
                 BlockNamedEntityLootCondition.BUILDER,
                 HasComputerIdLootCondition.BUILDER,

projects/common/src/datagen/java/dan200/computercraft/data/RecipeProvider.java

@@ -447,7 +447,7 @@ final class RecipeProvider extends net.minecraft.data.recipes.RecipeProvider {
     }
 
     private static ItemStack playerHead(String name, String uuid) {
-        return DataComponentUtil.createStack(Items.PLAYER_HEAD, DataComponents.PROFILE, new ResolvableProfile(new GameProfile(UUID.fromString(uuid), name)));
+        return DataComponentUtil.createStack(Items.PLAYER_HEAD, DataComponents.PROFILE, ResolvableProfile.createResolved(new GameProfile(UUID.fromString(uuid), name)));
     }
 
     private ShapedSpecBuilder customShaped(RecipeCategory category, ItemStack result) {

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

@@ -59,11 +59,11 @@ public enum UserLevel implements Predicate<CommandSourceStack> {
         var player = source.getPlayer();
         return server.isDedicatedServer()
             ? source.getEntity() == null && source.hasPermission(4) && source.getTextName().equals("Server")
-            : player != null && server.isSingleplayerOwner(player.getGameProfile());
+            : player != null && server.isSingleplayerOwner(player.nameAndId());
     }
 
     public static boolean isOwner(ServerPlayer player) {
-        var server = player.getServer();
+        var server = player.level().getServer();
-        return server != null && server.isSingleplayerOwner(player.getGameProfile());
+        return server != null && server.isSingleplayerOwner(player.nameAndId());
     }
 }

projects/common/src/main/java/dan200/computercraft/shared/common/HorizontalContainerBlock.java

@@ -50,7 +50,7 @@ public abstract class HorizontalContainerBlock extends BaseEntityBlock {
 
     @Override
     protected InteractionResult useWithoutItem(BlockState state, Level level, BlockPos pos, Player player, BlockHitResult hit) {
-        if (level.isClientSide) return InteractionResult.SUCCESS;
+        if (level.isClientSide()) return InteractionResult.SUCCESS;
 
         if (level.getBlockEntity(pos) instanceof BaseContainerBlockEntity container) {
             player.openMenu(container);
@@ -65,7 +65,7 @@ public abstract class HorizontalContainerBlock extends BaseEntityBlock {
     }
 
     @Override
-    protected final int getAnalogOutputSignal(BlockState pBlockState, Level pLevel, BlockPos pPos) {
+    protected final int getAnalogOutputSignal(BlockState pBlockState, Level pLevel, BlockPos pPos, Direction direction) {
         return AbstractContainerMenu.getRedstoneSignalFromBlockEntity(pLevel.getBlockEntity(pPos));
     }
 

projects/common/src/main/java/dan200/computercraft/shared/computer/blocks/AbstractComputerBlock.java

@@ -112,7 +112,7 @@ public abstract class AbstractComputerBlock<T extends AbstractComputerBlockEntit
     protected InteractionResult useWithoutItem(BlockState state, Level level, BlockPos pos, Player player, BlockHitResult hit) {
         if (!player.isCrouching() && level.getBlockEntity(pos) instanceof AbstractComputerBlockEntity computer) {
             // Regular right click to activate computer
-            if (!level.isClientSide && computer.isUsable(player)) {
+            if (!level.isClientSide() && computer.isUsable(player)) {
                 var serverComputer = computer.createServerComputer();
                 serverComputer.turnOn();
 
@@ -143,7 +143,7 @@ public abstract class AbstractComputerBlock<T extends AbstractComputerBlockEntit
     @Override
     @Nullable
     public <U extends BlockEntity> BlockEntityTicker<U> getTicker(Level level, BlockState state, BlockEntityType<U> type) {
-        return level.isClientSide ? null : BlockEntityHelpers.createTickerHelper(type, this.type.get(), serverTicker);
+        return level.isClientSide() ? null : BlockEntityHelpers.createTickerHelper(type, this.type.get(), serverTicker);
     }
 
     @Nullable

projects/common/src/main/java/dan200/computercraft/shared/computer/blocks/AbstractComputerBlockEntity.java

@@ -67,7 +67,7 @@ public abstract class AbstractComputerBlockEntity extends BlockEntity implements
     }
 
     protected void unload() {
-        if (getLevel().isClientSide) return;
+        if (getLevel().isClientSide()) return;
 
         var computer = getServerComputer();
         if (computer != null) computer.close();
@@ -91,7 +91,7 @@ public abstract class AbstractComputerBlockEntity extends BlockEntity implements
     }
 
     protected void serverTick() {
-        if (getLevel().isClientSide) return;
+        if (getLevel().isClientSide()) return;
         if (computerID < 0 && !startOn) return; // Don't tick if we don't need a computer!
 
         var computer = createServerComputer();
@@ -157,7 +157,7 @@ public abstract class AbstractComputerBlockEntity extends BlockEntity implements
     @Override
     public final void loadAdditional(ValueInput nbt) {
         super.loadAdditional(nbt);
-        if (level != null && level.isClientSide) {
+        if (level != null && level.isClientSide()) {
             loadClient(nbt);
         } else {
             loadServer(nbt);
@@ -340,14 +340,14 @@ public abstract class AbstractComputerBlockEntity extends BlockEntity implements
     }
 
     public final void setComputerID(int id) {
-        if (getLevel().isClientSide || computerID == id) return;
+        if (getLevel().isClientSide() || computerID == id) return;
 
         computerID = id;
         BlockEntityHelpers.updateBlock(this);
     }
 
     public final void setLabel(@Nullable String label) {
-        if (getLevel().isClientSide || Objects.equals(this.label, label)) return;
+        if (getLevel().isClientSide() || Objects.equals(this.label, label)) return;
 
         this.label = label;
         var computer = getServerComputer();
@@ -386,7 +386,7 @@ public abstract class AbstractComputerBlockEntity extends BlockEntity implements
 
     @Nullable
     public ServerComputer getServerComputer() {
-        return getLevel().isClientSide || getLevel().getServer() == null ? null : ServerContext.get(getLevel().getServer()).registry().get(instanceID);
+        return getLevel().isClientSide() || getLevel().getServer() == null ? null : ServerContext.get(getLevel().getServer()).registry().get(instanceID);
     }
 
     // Networking stuff

projects/common/src/main/java/dan200/computercraft/shared/computer/core/ComputerFamily.java

@@ -45,7 +45,7 @@ public enum ComputerFamily {
     }
 
     private static boolean checkCommandUsable(Player player) {
-        var server = player.getServer();
+        var server = player.level().getServer();
         if (server == null || !server.isCommandBlockEnabled()) {
             player.displayClientMessage(Component.translatable("advMode.notEnabled"), true);
             return false;

projects/common/src/main/java/dan200/computercraft/shared/container/InventoryDelegate.java

@@ -5,11 +5,14 @@
 package dan200.computercraft.shared.container;
 
 import net.minecraft.world.Container;
+import net.minecraft.world.entity.ContainerUser;
 import net.minecraft.world.entity.player.Player;
 import net.minecraft.world.item.Item;
 import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.level.block.entity.BlockEntity;
 
+import java.util.Iterator;
+import java.util.List;
 import java.util.Set;
 import java.util.function.Predicate;
 
@@ -69,12 +72,12 @@ public interface InventoryDelegate extends Container {
     }
 
     @Override
-    default void startOpen(Player player) {
+    default void startOpen(ContainerUser player) {
         getInventory().startOpen(player);
     }
 
     @Override
-    default void stopOpen(Player player) {
+    default void stopOpen(ContainerUser player) {
         getInventory().stopOpen(player);
     }
 
@@ -102,4 +105,24 @@ public interface InventoryDelegate extends Container {
     default boolean hasAnyMatching(Predicate<ItemStack> predicate) {
         return getInventory().hasAnyMatching(predicate);
     }
+
+    @Override
+    default int getMaxStackSize(ItemStack stack) {
+        return getInventory().getMaxStackSize(stack);
+    }
+
+    @Override
+    default List<ContainerUser> getEntitiesWithContainerOpen() {
+        return getInventory().getEntitiesWithContainerOpen();
+    }
+
+    @Override
+    default boolean canTakeItem(Container target, int slot, ItemStack stack) {
+        return getInventory().canTakeItem(target, slot, stack);
+    }
+
+    @Override
+    default Iterator<ItemStack> iterator() {
+        return getInventory().iterator();
+    }
 }

projects/common/src/main/java/dan200/computercraft/shared/lectern/CustomLecternBlock.java

@@ -9,6 +9,7 @@ import dan200.computercraft.shared.media.items.PrintoutItem;
 import dan200.computercraft.shared.pocket.items.PocketComputerItem;
 import dan200.computercraft.shared.util.BlockEntityHelpers;
 import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
 import net.minecraft.server.level.ServerLevel;
 import net.minecraft.stats.Stats;
 import net.minecraft.util.RandomSource;
@@ -55,7 +56,7 @@ public class CustomLecternBlock extends LecternBlock {
      */
     public static InteractionResult tryPlaceItem(Player player, Level level, BlockPos pos, BlockState blockState, ItemStack item) {
         if (item.getItem() instanceof PrintoutItem || item.getItem() instanceof PocketComputerItem) {
-            if (!level.isClientSide) replaceLectern(player, level, pos, blockState, item);
+            if (!level.isClientSide()) replaceLectern(player, level, pos, blockState, item);
             return InteractionResult.SUCCESS;
         }
 
@@ -129,13 +130,13 @@ public class CustomLecternBlock extends LecternBlock {
     }
 
     @Override
-    public int getAnalogOutputSignal(BlockState blockState, Level level, BlockPos pos) {
+    protected int getAnalogOutputSignal(BlockState blockState, Level level, BlockPos pos, Direction direction) {
         return level.getBlockEntity(pos) instanceof CustomLecternBlockEntity lectern ? lectern.getRedstoneSignal() : 0;
     }
 
     @Override
     public InteractionResult useWithoutItem(BlockState state, Level level, BlockPos pos, Player player, BlockHitResult hit) {
-        if (!level.isClientSide && level.getBlockEntity(pos) instanceof CustomLecternBlockEntity lectern) {
+        if (!level.isClientSide() && level.getBlockEntity(pos) instanceof CustomLecternBlockEntity lectern) {
             if (player.isSecondaryUseActive()) {
                 // When shift+clicked with an empty hand, drop the item and replace with the normal lectern.
                 clearLectern(level, pos, state);
@@ -152,7 +153,7 @@ public class CustomLecternBlock extends LecternBlock {
 
     @Override
     public @Nullable <T extends BlockEntity> BlockEntityTicker<T> getTicker(Level level, BlockState state, BlockEntityType<T> type) {
-        return level.isClientSide ? null : BlockEntityHelpers.createTickerHelper(type, ModRegistry.BlockEntities.LECTERN.get(), serverTicker);
+        return level.isClientSide() ? null : BlockEntityHelpers.createTickerHelper(type, ModRegistry.BlockEntities.LECTERN.get(), serverTicker);
     }
 
     private static final BlockEntityTicker<CustomLecternBlockEntity> serverTicker = (level, pos, state, lectern) -> lectern.tick();

projects/common/src/main/java/dan200/computercraft/shared/media/items/PrintoutItem.java

@@ -23,7 +23,7 @@ public class PrintoutItem extends Item {
     @Override
     public InteractionResult use(Level world, Player player, InteractionHand hand) {
         var stack = player.getItemInHand(hand);
-        if (!world.isClientSide) {
+        if (!world.isClientSide()) {
             var title = PrintoutData.getOrEmpty(stack).title();
             var displayTitle = Strings.isNullOrEmpty(title) ? stack.getDisplayName() : Component.literal(title);
             player.openMenu(new SimpleMenuProvider((id, playerInventory, p) -> PrintoutMenu.createInHand(id, p, hand), displayTitle));

projects/common/src/main/java/dan200/computercraft/shared/peripheral/diskdrive/DiskDriveBlock.java

@@ -58,7 +58,7 @@ public class DiskDriveBlock extends HorizontalContainerBlock {
         var blockPos = context.getClickedPos();
         var blockState = level.getBlockState(blockPos);
         if (blockState.is(ModRegistry.Blocks.DISK_DRIVE.get()) && blockState.getValue(STATE) == DiskDriveState.EMPTY) {
-            if (!level.isClientSide && level.getBlockEntity(blockPos) instanceof DiskDriveBlockEntity drive && drive.getDiskStack().isEmpty()) {
+            if (!level.isClientSide() && level.getBlockEntity(blockPos) instanceof DiskDriveBlockEntity drive && drive.getDiskStack().isEmpty()) {
                 drive.setDiskStack(context.getItemInHand().split(1));
             }
             return InteractionResult.SUCCESS;
@@ -76,6 +76,6 @@ public class DiskDriveBlock extends HorizontalContainerBlock {
     @Override
     @Nullable
     public <U extends BlockEntity> BlockEntityTicker<U> getTicker(Level level, BlockState state, BlockEntityType<U> type) {
-        return level.isClientSide ? null : BaseEntityBlock.createTickerHelper(type, ModRegistry.BlockEntities.DISK_DRIVE.get(), serverTicker);
+        return level.isClientSide() ? null : BaseEntityBlock.createTickerHelper(type, ModRegistry.BlockEntities.DISK_DRIVE.get(), serverTicker);
     }
 }

projects/common/src/main/java/dan200/computercraft/shared/peripheral/diskdrive/DiskDriveBlockEntity.java

@@ -162,7 +162,7 @@ public final class DiskDriveBlockEntity extends AbstractContainerBlockEntity imp
 
     @Override
     public void setChanged() {
-        if (level != null && !level.isClientSide) updateMedia();
+        if (level != null && !level.isClientSide()) updateMedia();
         super.setChanged();
     }
 
@@ -357,7 +357,7 @@ public final class DiskDriveBlockEntity extends AbstractContainerBlockEntity imp
     }
 
     private void ejectContents() {
-        if (getLevel().isClientSide) return;
+        if (getLevel().isClientSide()) return;
 
         var stack = getDiskStack();
         if (stack.isEmpty()) return;

projects/common/src/main/java/dan200/computercraft/shared/peripheral/generic/methods/AbstractEnergyMethods.java

@@ -40,7 +40,7 @@ public abstract class AbstractEnergyMethods<T> implements GenericPeripheral {
      * @return The energy stored in this block, in FE.
      */
     @LuaFunction(mainThread = true)
-    public abstract int getEnergy(T energy);
+    public abstract long getEnergy(T energy);
 
     /**
      * Get the maximum amount of energy this block can store.
@@ -49,5 +49,5 @@ public abstract class AbstractEnergyMethods<T> implements GenericPeripheral {
      * @return The energy capacity of this block.
      */
     @LuaFunction(mainThread = true)
-    public abstract int getEnergyCapacity(T energy);
+    public abstract long getEnergyCapacity(T energy);
 }

projects/common/src/main/java/dan200/computercraft/shared/peripheral/modem/wired/CableBlock.java

@@ -102,7 +102,7 @@ public class CableBlock extends Block implements SimpleWaterloggedBlock, EntityB
             return false;
         }
 
-        return world.setBlock(pos, fluid.createLegacyBlock(), world.isClientSide ? UPDATE_ALL_IMMEDIATE : UPDATE_ALL);
+        return world.setBlock(pos, fluid.createLegacyBlock(), world.isClientSide() ? UPDATE_ALL_IMMEDIATE : UPDATE_ALL);
     }
 
     public boolean onCustomDestroyBlock(BlockState state, Level world, BlockPos pos, Player player) {
@@ -130,7 +130,7 @@ public class CableBlock extends Block implements SimpleWaterloggedBlock, EntityB
         world.setBlockAndUpdate(pos, correctConnections(world, pos, newState));
 
         cable.connectionsChanged();
-        if (!world.isClientSide && !player.getAbilities().instabuild) {
+        if (!world.isClientSide() && !player.getAbilities().instabuild) {
             Block.popResource(world, pos, item);
         }
 

projects/common/src/main/java/dan200/computercraft/shared/peripheral/modem/wired/CableBlockEntity.java

@@ -80,7 +80,7 @@ public class CableBlockEntity extends BlockEntity {
     public void setRemoved() {
         super.setRemoved();
         modem.removed();
-        if (level == null || !level.isClientSide) node.remove();
+        if (level == null || !level.isClientSide()) node.remove();
     }
 
     @Override
@@ -108,7 +108,7 @@ public class CableBlockEntity extends BlockEntity {
 
     void neighborChanged() {
         var dir = getModemDirection();
-        if (!getLevel().isClientSide && dir != null && isPeripheralOn()) queueRefreshPeripheral();
+        if (!getLevel().isClientSide() && dir != null && isPeripheralOn()) queueRefreshPeripheral();
     }
 
     void queueRefreshPeripheral() {
@@ -119,7 +119,7 @@ public class CableBlockEntity extends BlockEntity {
     InteractionResult use(Player player) {
         if (!canAttachPeripheral()) return InteractionResult.FAIL;
 
-        if (getLevel().isClientSide) return InteractionResult.SUCCESS;
+        if (getLevel().isClientSide()) return InteractionResult.SUCCESS;
 
         var oldName = peripheral.getConnectedName();
         if (isPeripheralOn()) {
@@ -167,7 +167,7 @@ public class CableBlockEntity extends BlockEntity {
     }
 
     void blockTick() {
-        if (getLevel().isClientSide) return;
+        if (getLevel().isClientSide()) return;
 
         if (refreshPeripheral) {
             refreshPeripheral = false;
@@ -185,7 +185,7 @@ public class CableBlockEntity extends BlockEntity {
     }
 
     void connectionsChanged() {
-        if (getLevel().isClientSide) return;
+        if (getLevel().isClientSide()) return;
         refreshConnections = false;
 
         var state = getBlockState();

projects/common/src/main/java/dan200/computercraft/shared/peripheral/modem/wired/WiredModemFullBlockEntity.java

@@ -97,7 +97,7 @@ public class WiredModemFullBlockEntity extends BlockEntity {
         for (var modem : modems) {
             if (modem != null) modem.removed();
         }
-        if (level == null || !level.isClientSide) node.remove();
+        if (level == null || !level.isClientSide()) node.remove();
     }
 
     @Override
@@ -120,7 +120,7 @@ public class WiredModemFullBlockEntity extends BlockEntity {
 
     public InteractionResult use(Player player) {
         if (player.isCrouching() || !player.mayBuild()) return InteractionResult.PASS;
-        if (getLevel().isClientSide) return InteractionResult.SUCCESS;
+        if (getLevel().isClientSide()) return InteractionResult.SUCCESS;
 
         // On server, we interacted if a peripheral was found
         var oldPeriphNames = getConnectedPeripheralNames();
@@ -167,7 +167,7 @@ public class WiredModemFullBlockEntity extends BlockEntity {
     }
 
     void blockTick() {
-        if (getLevel().isClientSide) return;
+        if (getLevel().isClientSide()) return;
 
         if (invalidSides != 0) {
             var oldInvalidSides = invalidSides;
@@ -194,7 +194,7 @@ public class WiredModemFullBlockEntity extends BlockEntity {
     }
 
     private void connectionsChanged() {
-        if (getLevel().isClientSide) return;
+        if (getLevel().isClientSide()) return;
         refreshConnections = false;
 
         var world = getLevel();

projects/common/src/main/java/dan200/computercraft/shared/peripheral/monitor/MonitorBlock.java

@@ -95,7 +95,7 @@ public class MonitorBlock extends HorizontalDirectionalBlock implements EntityBl
             return InteractionResult.PASS;
         }
 
-        if (!level.isClientSide) {
+        if (!level.isClientSide()) {
             monitor.monitorTouched(
                 (float) (hit.getLocation().x - hit.getBlockPos().getX()),
                 (float) (hit.getLocation().y - hit.getBlockPos().getY()),
@@ -111,7 +111,7 @@ public class MonitorBlock extends HorizontalDirectionalBlock implements EntityBl
         super.setPlacedBy(world, pos, blockState, livingEntity, itemStack);
 
         var entity = world.getBlockEntity(pos);
-        if (entity instanceof MonitorBlockEntity monitor && !world.isClientSide) {
+        if (entity instanceof MonitorBlockEntity monitor && !world.isClientSide()) {
             // Defer the block update if we're being placed by another TE. See #691
             if (livingEntity == null || (livingEntity instanceof ServerPlayer player && PlatformHelper.get().isFakePlayer(player))) {
                 monitor.updateNeighborsDeferred();

projects/common/src/main/java/dan200/computercraft/shared/peripheral/monitor/MonitorBlockEntity.java

@@ -99,7 +99,7 @@ public class MonitorBlockEntity extends BlockEntity {
     public void preRemoveSideEffects(BlockPos blockPos, BlockState blockState) {
         super.preRemoveSideEffects(blockPos, blockState);
         isRemoving = true;
-        if (level != null && !getLevel().isClientSide) contractNeighbours();
+        if (level != null && !getLevel().isClientSide()) contractNeighbours();
     }
 
     @Override
@@ -129,7 +129,7 @@ public class MonitorBlockEntity extends BlockEntity {
         width = nbt.getIntOr(NBT_WIDTH, 1);
         height = nbt.getIntOr(NBT_HEIGHT, 1);
 
-        if (level != null && level.isClientSide) onClientLoad(oldXIndex, oldYIndex);
+        if (level != null && level.isClientSide()) onClientLoad(oldXIndex, oldYIndex);
     }
 
     void blockTick() {

projects/common/src/main/java/dan200/computercraft/shared/peripheral/speaker/SpeakerBlock.java

@@ -50,7 +50,7 @@ public class SpeakerBlock extends HorizontalDirectionalBlock implements EntityBl
     @Override
     @Nullable
     public <U extends BlockEntity> BlockEntityTicker<U> getTicker(Level level, BlockState state, BlockEntityType<U> type) {
-        return level.isClientSide ? null : BlockEntityHelpers.createTickerHelper(type, ModRegistry.BlockEntities.SPEAKER.get(), serverTicker);
+        return level.isClientSide() ? null : BlockEntityHelpers.createTickerHelper(type, ModRegistry.BlockEntities.SPEAKER.get(), serverTicker);
     }
 
     @Nullable

projects/common/src/main/java/dan200/computercraft/shared/peripheral/speaker/SpeakerBlockEntity.java

@@ -31,7 +31,7 @@ public class SpeakerBlockEntity extends BlockEntity {
     @Override
     public void setRemoved() {
         super.setRemoved();
-        if (level != null && !level.isClientSide) {
+        if (level != null && !level.isClientSide()) {
             ServerNetworking.sendToAllPlayers(new SpeakerStopClientMessage(peripheral.getSource()), Nullability.assertNonNull(getLevel().getServer()));
         }
     }

projects/common/src/main/java/dan200/computercraft/shared/pocket/items/PocketComputerItem.java

@@ -111,7 +111,7 @@ public class PocketComputerItem extends Item {
     @ForgeOverride
     public boolean onEntityItemUpdate(ItemStack stack, ItemEntity entity) {
         var level = entity.level();
-        if (level.isClientSide || level.getServer() == null) return false;
+        if (level.isClientSide() || level.getServer() == null) return false;
 
         // If we're an item entity, tick an already existing computer (as to update the position), but do not keep the
         // computer alive.
@@ -123,7 +123,7 @@ public class PocketComputerItem extends Item {
     @Override
     public InteractionResult use(Level world, Player player, InteractionHand hand) {
         var stack = player.getItemInHand(hand);
-        if (!world.isClientSide) {
+        if (!world.isClientSide()) {
             var holder = new PocketHolder.PlayerHolder((ServerPlayer) player, InventoryUtil.getHandSlot(player, hand));
             var brain = getOrCreateBrain((ServerLevel) world, holder, stack);
             var computer = brain.computer();

projects/common/src/main/java/dan200/computercraft/shared/turtle/blocks/TurtleBlock.java

@@ -125,7 +125,7 @@ public class TurtleBlock extends AbstractComputerBlock<TurtleBlockEntity> implem
     public void setPlacedBy(Level level, BlockPos pos, BlockState state, @Nullable LivingEntity entity, ItemStack stack) {
         super.setPlacedBy(level, pos, state, entity, stack);
 
-        if (!level.isClientSide && level.getBlockEntity(pos) instanceof TurtleBlockEntity turtle && entity instanceof Player player) {
+        if (!level.isClientSide() && level.getBlockEntity(pos) instanceof TurtleBlockEntity turtle && entity instanceof Player player) {
             turtle.setOwningPlayer(player.getGameProfile());
         }
     }
@@ -134,7 +134,7 @@ public class TurtleBlock extends AbstractComputerBlock<TurtleBlockEntity> implem
     protected InteractionResult useItemOn(ItemStack currentItem, BlockState state, Level level, BlockPos pos, Player player, InteractionHand hand, BlockHitResult hit) {
         if (currentItem.getItem() == Items.NAME_TAG && currentItem.has(DataComponents.CUSTOM_NAME) && level.getBlockEntity(pos) instanceof AbstractComputerBlockEntity computer) {
             // Label to rename computer
-            if (!level.isClientSide) {
+            if (!level.isClientSide()) {
                 computer.setLabel(currentItem.getHoverName().getString());
                 currentItem.shrink(1);
             }
@@ -157,6 +157,6 @@ public class TurtleBlock extends AbstractComputerBlock<TurtleBlockEntity> implem
     @Override
     @Nullable
     public <U extends BlockEntity> BlockEntityTicker<U> getTicker(Level level, BlockState state, BlockEntityType<U> type) {
-        return level.isClientSide ? BlockEntityHelpers.createTickerHelper(type, this.type.get(), clientTicker) : super.getTicker(level, state, type);
+        return level.isClientSide() ? BlockEntityHelpers.createTickerHelper(type, this.type.get(), clientTicker) : super.getTicker(level, state, type);
     }
 }

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

@@ -6,7 +6,6 @@ package dan200.computercraft.shared.turtle.core;
 
 import com.mojang.authlib.GameProfile;
 import com.mojang.serialization.Codec;
-import com.mojang.serialization.codecs.RecordCodecBuilder;
 import dan200.computercraft.api.lua.ILuaCallback;
 import dan200.computercraft.api.lua.MethodResult;
 import dan200.computercraft.api.peripheral.IPeripheral;
@@ -28,7 +27,6 @@ import dan200.computercraft.shared.util.Holiday;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.Direction;
 import net.minecraft.core.Holder;
-import net.minecraft.core.UUIDUtil;
 import net.minecraft.core.component.DataComponentPatch;
 import net.minecraft.core.particles.ParticleTypes;
 import net.minecraft.resources.ResourceLocation;
@@ -65,15 +63,7 @@ public class TurtleBrain implements TurtleAccessInternal {
 
     private static final String NBT_SLOT = "Slot";
 
-    /**
+    private static final Codec<GameProfile> GAME_PROFILE_CODEC = ExtraCodecs.STORED_GAME_PROFILE.codec();
-     * {@link net.minecraft.world.item.component.ResolvableProfile#CODEC}, but resolving to a {@link GameProfile}
-     * directly. We don't use {@link ExtraCodecs#GAME_PROFILE}, as that encodes the UUID as a string, not an int array.
-     */
-    private static final Codec<GameProfile> GAME_PROFILE_CODEC = RecordCodecBuilder.create(instance -> instance.group(
-            UUIDUtil.CODEC.fieldOf("id").forGetter(GameProfile::getId),
-            ExtraCodecs.PLAYER_NAME.fieldOf("name").forGetter(GameProfile::getName)
-        )
-        .apply(instance, GameProfile::new));
 
     private static final int ANIM_DURATION = 8;
 
@@ -121,7 +111,7 @@ public class TurtleBrain implements TurtleAccessInternal {
 
     public void update() {
         var world = getLevel();
-        if (!world.isClientSide) {
+        if (!world.isClientSide()) {
             // Advance movement
             updateCommands();
 
@@ -221,7 +211,7 @@ public class TurtleBrain implements TurtleAccessInternal {
 
     @Override
     public boolean teleportTo(Level world, BlockPos pos) {
-        if (world.isClientSide || getLevel().isClientSide) {
+        if (world.isClientSide() || getLevel().isClientSide()) {
             throw new UnsupportedOperationException("Cannot teleport on the client");
         }
 
@@ -335,7 +325,7 @@ public class TurtleBrain implements TurtleAccessInternal {
 
     @Override
     public void setSelectedSlot(int slot) {
-        if (getLevel().isClientSide) throw new UnsupportedOperationException("Cannot set the slot on the client");
+        if (getLevel().isClientSide()) throw new UnsupportedOperationException("Cannot set the slot on the client");
 
         if (slot >= 0 && slot < owner.getContainerSize()) {
             selectedSlot = slot;
@@ -371,7 +361,7 @@ public class TurtleBrain implements TurtleAccessInternal {
 
     @Override
     public boolean consumeFuel(int fuel) {
-        if (getLevel().isClientSide) throw new UnsupportedOperationException("Cannot consume fuel on the client");
+        if (getLevel().isClientSide()) throw new UnsupportedOperationException("Cannot consume fuel on the client");
 
         if (!isFuelNeeded()) return true;
 
@@ -385,7 +375,7 @@ public class TurtleBrain implements TurtleAccessInternal {
 
     @Override
     public void addFuel(int fuel) {
-        if (getLevel().isClientSide) throw new UnsupportedOperationException("Cannot add fuel on the client");
+        if (getLevel().isClientSide()) throw new UnsupportedOperationException("Cannot add fuel on the client");
 
         var addition = Math.max(fuel, 0);
         setFuelLevel(getFuelLevel() + addition);
@@ -393,7 +383,7 @@ public class TurtleBrain implements TurtleAccessInternal {
 
     @Override
     public MethodResult executeCommand(TurtleCommand command) {
-        if (getLevel().isClientSide) throw new UnsupportedOperationException("Cannot run commands on the client");
+        if (getLevel().isClientSide()) throw new UnsupportedOperationException("Cannot run commands on the client");
         if (commandQueue.size() > 16) return MethodResult.of(false, "Too many ongoing turtle commands");
 
         commandQueue.offer(new TurtleCommandQueueEntry(++commandsIssued, command));
@@ -403,7 +393,7 @@ public class TurtleBrain implements TurtleAccessInternal {
 
     @Override
     public void playAnimation(TurtleAnimation animation) {
-        if (getLevel().isClientSide) throw new UnsupportedOperationException("Cannot play animations on the client");
+        if (getLevel().isClientSide()) throw new UnsupportedOperationException("Cannot play animations on the client");
 
         this.animation = animation;
         if (this.animation == TurtleAnimation.SHORT_WAIT) {
@@ -489,7 +479,9 @@ public class TurtleBrain implements TurtleAccessInternal {
         instance.setUpgrade(upgrade);
 
         // Create peripherals
-        if (owner.getLevel() != null && !owner.getLevel().isClientSide) updatePeripherals(owner.createServerComputer());
+        if (owner.getLevel() != null && !owner.getLevel().isClientSide()) {
+            updatePeripherals(owner.createServerComputer());
+        }
 
         return true;
     }
@@ -681,7 +673,7 @@ public class TurtleBrain implements TurtleAccessInternal {
             }
 
             // Advance valentines day easter egg
-            if (world.isClientSide && animation == TurtleAnimation.MOVE_FORWARD && animationProgress == 4) {
+            if (world.isClientSide() && animation == TurtleAnimation.MOVE_FORWARD && animationProgress == 4) {
                 // Spawn love pfx if valentines day
                 var currentHoliday = Holiday.getCurrent();
                 if (currentHoliday == Holiday.VALENTINES) {

projects/common/src/main/java/dan200/computercraft/shared/turtle/items/TurtleItem.java

@@ -57,7 +57,7 @@ public class TurtleItem extends BlockItem {
 
     public static final CauldronInteraction CAULDRON_INTERACTION = (blockState, level, pos, player, hand, stack) -> {
         if (!stack.has(DataComponents.DYED_COLOR)) return InteractionResult.TRY_WITH_EMPTY_HAND;
-        if (!level.isClientSide) {
+        if (!level.isClientSide()) {
             stack.remove(DataComponents.DYED_COLOR);
             LayeredCauldronBlock.lowerFillLevel(blockState, level, pos);
         }

projects/common/src/main/java/dan200/computercraft/shared/turtle/upgrades/TurtleModem.java

@@ -80,7 +80,7 @@ public class TurtleModem extends AbstractTurtleUpgrade {
     @Override
     public void update(ITurtleAccess turtle, TurtleSide side) {
         // Advance the modem
-        if (!turtle.getLevel().isClientSide) {
+        if (!turtle.getLevel().isClientSide()) {
             var peripheral = turtle.getPeripheral(side);
             if (peripheral instanceof Peripheral modem) {
                 var state = modem.getModemState();

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

@@ -29,6 +29,7 @@ import net.minecraft.tags.TagKey;
 import net.minecraft.world.InteractionHand;
 import net.minecraft.world.InteractionResult;
 import net.minecraft.world.entity.Entity;
+import net.minecraft.world.entity.EntityReference;
 import net.minecraft.world.entity.LivingEntity;
 import net.minecraft.world.entity.ai.attributes.Attributes;
 import net.minecraft.world.entity.decoration.ArmorStand;
@@ -218,7 +219,7 @@ public class TurtleTool extends AbstractTurtleUpgrade {
 
         // If this is a projectile, attempt to deflect it instead.
         if (entity.getType().is(EntityTypeTags.REDIRECTABLE_PROJECTILE) && entity instanceof Projectile projectile &&
-            projectile.deflect(ProjectileDeflection.AIM_DEFLECT, player, player, true)
+            projectile.deflect(ProjectileDeflection.AIM_DEFLECT, player, EntityReference.of(player), true)
         ) {
             return true;
         }

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

@@ -56,7 +56,7 @@ public final class TickScheduler {
      */
     public static void schedule(Token token) {
         var world = token.owner.getLevel();
-        if (world != null && !world.isClientSide && Token.STATE.compareAndSet(token, State.IDLE, State.SCHEDULED)) {
+        if (world != null && !world.isClientSide() && Token.STATE.compareAndSet(token, State.IDLE, State.SCHEDULED)) {
             toTick.add(token);
         }
     }

projects/common/src/main/resources/computercraft.accesswidener

@@ -17,8 +17,8 @@ accessible field net/minecraft/client/gui/components/ChatComponent allMessages L
 
 # ItemPocketRenderer/ItemPrintoutRenderer
 accessible method net/minecraft/client/renderer/ItemInHandRenderer calculateMapTilt (F)F
-accessible method net/minecraft/client/renderer/ItemInHandRenderer renderMapHand (Lcom/mojang/blaze3d/vertex/PoseStack;Lnet/minecraft/client/renderer/MultiBufferSource;ILnet/minecraft/world/entity/HumanoidArm;)V
+accessible method net/minecraft/client/renderer/ItemInHandRenderer renderMapHand (Lcom/mojang/blaze3d/vertex/PoseStack;Lnet/minecraft/client/renderer/SubmitNodeCollector;ILnet/minecraft/world/entity/HumanoidArm;)V
-accessible method net/minecraft/client/renderer/ItemInHandRenderer renderPlayerArm (Lcom/mojang/blaze3d/vertex/PoseStack;Lnet/minecraft/client/renderer/MultiBufferSource;IFFLnet/minecraft/world/entity/HumanoidArm;)V
+accessible method net/minecraft/client/renderer/ItemInHandRenderer renderPlayerArm (Lcom/mojang/blaze3d/vertex/PoseStack;Lnet/minecraft/client/renderer/SubmitNodeCollector;IFFLnet/minecraft/world/entity/HumanoidArm;)V
 
 # SpeakerInstance/SpeakerManager
 accessible method com/mojang/blaze3d/audio/Channel pumpBuffers (I)V

projects/common/src/testFixtures/java/dan200/computercraft/test/shared/WithMinecraft.java

@@ -31,8 +31,8 @@ public @interface WithMinecraft {
         }
 
         public static void bootstrap() {
-            SharedConstants.tryDetectVersion();
             ServiceLoader.load(SetupHook.class, SetupHook.class.getClassLoader()).forEach(SetupHook::run);
+            SharedConstants.tryDetectVersion();
             Bootstrap.bootStrap();
         }
     }

projects/common/src/testMod/java/dan200/computercraft/mixin/gametest/GameTestServerMixin.java

@@ -10,7 +10,7 @@ import net.minecraft.gametest.framework.GameTestServer;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.server.Services;
 import net.minecraft.server.WorldStem;
-import net.minecraft.server.level.progress.ChunkProgressListenerFactory;
+import net.minecraft.server.level.progress.LevelLoadListener;
 import net.minecraft.server.packs.repository.PackRepository;
 import net.minecraft.world.level.storage.LevelStorageSource;
 import org.spongepowered.asm.mixin.Mixin;
@@ -22,7 +22,10 @@ import java.util.concurrent.locks.LockSupport;
 
 @Mixin(GameTestServer.class)
 abstract class GameTestServerMixin extends MinecraftServer {
-    GameTestServerMixin(Thread serverThread, LevelStorageSource.LevelStorageAccess storageSource, PackRepository packRepository, WorldStem worldStem, Proxy proxy, DataFixer fixerUpper, Services services, ChunkProgressListenerFactory progressListenerFactory) {
+    GameTestServerMixin(
+        Thread serverThread, LevelStorageSource.LevelStorageAccess storageSource, PackRepository packRepository,
+        WorldStem worldStem, Proxy proxy, DataFixer fixerUpper, Services services, LevelLoadListener progressListenerFactory
+    ) {
         super(serverThread, storageSource, packRepository, worldStem, proxy, fixerUpper, services, progressListenerFactory);
     }
 

projects/common/src/testMod/kotlin/dan200/computercraft/gametest/Computer_Test.kt

@@ -13,6 +13,7 @@ import dan200.computercraft.gametest.api.*
 import dan200.computercraft.shared.ModRegistry
 import dan200.computercraft.test.core.assertArrayEquals
 import dan200.computercraft.test.core.computer.getApi
+import net.minecraft.client.input.KeyEvent
 import net.minecraft.core.BlockPos
 import net.minecraft.core.Direction
 import net.minecraft.gametest.framework.GameTestHelper
@@ -155,8 +156,8 @@ class Computer_Test {
         // Press a key on the client
         thenOnClient {
             val screen = minecraft.screen as AbstractComputerScreen<*>
-            screen.keyPressed(GLFW.GLFW_KEY_A, 0, 0)
+            screen.keyPressed(KeyEvent(GLFW.GLFW_KEY_A, 0, 0))
-            screen.keyReleased(GLFW.GLFW_KEY_A, 0, 0)
+            screen.keyReleased(KeyEvent(GLFW.GLFW_KEY_A, 0, 0))
         }
         // And assert it is handled and sent back to the client
         thenIdle(2)

projects/common/src/testMod/kotlin/dan200/computercraft/gametest/Disk_Drive_Test.kt

@@ -122,7 +122,7 @@ class Disk_Drive_Test {
         thenWaitUntil {
             val drive = helper.getBlockEntity(drivePos, DiskDriveBlockEntity::class.java)
             if (!drive.getItem(0).has(ModRegistry.DataComponents.DISK_ID.get())) {
-                helper.fail("Disk has no item", drivePos)
+                helper.abort("Disk has no item", drivePos)
             }
         }
     }

projects/common/src/testMod/kotlin/dan200/computercraft/gametest/Monitor_Test.kt

@@ -45,7 +45,7 @@ class Monitor_Test {
             val tile = context.getBlockEntity(pos, MonitorBlockEntity::class.java)
 
             if (tile.width != 1 || tile.height != 1) {
-                context.fail("Tile has width and height of ${tile.width}x${tile.height}, but should be 1x1", pos)
+                context.abort("Tile has width and height of ${tile.width}x${tile.height}, but should be 1x1", pos)
             }
         }
     }

projects/common/src/testMod/kotlin/dan200/computercraft/gametest/Recipe_Test.kt

@@ -35,7 +35,9 @@ class Recipe_Test {
 
             val profile = GameProfile(UUID.fromString("f3c8d69b-0776-4512-8434-d1b2165909eb"), "dan200")
 
-            val tag = DataComponentPatch.builder().set(DataComponents.PROFILE, ResolvableProfile(profile)).build()
+            val tag =
+                DataComponentPatch.builder().set(DataComponents.PROFILE, ResolvableProfile.createResolved(profile))
+                    .build()
             assertEquals(tag, result.componentsPatch, "Expected NBT tags to be the same")
         }
     }

projects/common/src/testMod/kotlin/dan200/computercraft/gametest/Turtle_Test.kt

@@ -680,7 +680,7 @@ class Turtle_Test {
 
             val villager = helper.getEntity(EntityType.VILLAGER)
             val expectedY = helper.absolutePos(pos).y - 0.125
-            if (villager.y < expectedY) helper.fail("Expected villager at y>=$expectedY, but at ${villager.y}", pos)
+            if (villager.y < expectedY) helper.abort("Expected villager at y>=$expectedY, but at ${villager.y}", pos)
         }
     }
 
@@ -697,7 +697,7 @@ class Turtle_Test {
             helper.assertEntityNotPresent(EntityType.SHEEP)
             val count = helper.getBlockEntity(turtlePos, TurtleBlockEntity::class.java)
                 .countItem(Items.WHITE_WOOL)
-            if (count == 0) helper.fail("Expected turtle to have white wool", turtlePos)
+            if (count == 0) helper.abort("Expected turtle to have white wool", turtlePos)
         }
     }
 

projects/common/src/testMod/kotlin/dan200/computercraft/gametest/api/ClientTestExtensions.kt

@@ -35,7 +35,7 @@ fun Minecraft.isRenderingStable(): Boolean = (this as MinecraftExtensions).`comp
 fun GameTestSequence.thenOnClient(task: ClientTestHelper.() -> Unit): GameTestSequence {
     var future: CompletableFuture<Void>? = null
     thenExecute { future = Minecraft.getInstance().submit { task(ClientTestHelper()) } }
-    thenWaitUntil { if (!future!!.isDone) fail("Not done task yet") }
+    thenWaitUntil { if (!future!!.isDone) abort("Not done task yet") }
     thenExecute {
         try {
             future!!.get()
@@ -59,10 +59,10 @@ fun GameTestSequence.thenScreenshot(name: String? = null, showGui: Boolean = fal
     thenWaitUntil {
         if (Minecraft.getInstance().isRenderingStable()) {
             val idleFor = ++counter
-            if (idleFor <= 20) fail("Only idle for $idleFor ticks")
+            if (idleFor <= 20) abort("Only idle for $idleFor ticks")
         } else {
             counter = 0
-            fail("Waiting for client to finish rendering")
+            abort("Waiting for client to finish rendering")
         }
     }
 
@@ -74,7 +74,7 @@ fun GameTestSequence.thenScreenshot(name: String? = null, showGui: Boolean = fal
     // Take a screenshot and wait for it to have finished.
     val hasScreenshot = AtomicBoolean()
     thenOnClient { screenshot("$fullName.png") { hasScreenshot.set(true) } }
-    thenWaitUntil { if (!hasScreenshot.get()) fail("Screenshot does not exist") }
+    thenWaitUntil { if (!hasScreenshot.get()) abort("Screenshot does not exist") }
     thenOnClient { minecraft.options.hideGui = false }
 
     return this
@@ -92,7 +92,7 @@ fun ServerPlayer.setupForTest() {
  */
 fun GameTestHelper.positionAtArmorStand() {
     val stand = getEntity(EntityType.ARMOR_STAND)
-    val player = level.randomPlayer ?: fail("Player does not exist")
+    val player = level.randomPlayer ?: abort("Player does not exist")
 
     player.setupForTest()
     player.connection.teleport(stand.x, stand.y, stand.z, stand.yRot, stand.xRot)
@@ -103,7 +103,7 @@ fun GameTestHelper.positionAtArmorStand() {
  */
 fun GameTestHelper.positionAt(pos: BlockPos, yRot: Float = 0.0f, xRot: Float = 0.0f) {
     val absolutePos = absolutePos(pos)
-    val player = level.randomPlayer ?: fail("Player does not exist")
+    val player = level.randomPlayer ?: abort("Player does not exist")
 
     player.setupForTest()
     player.connection.teleport(absolutePos.x + 0.5, absolutePos.y + 0.5, absolutePos.z + 0.5, yRot, xRot)

projects/common/src/testMod/kotlin/dan200/computercraft/gametest/api/TestExtensions.kt

@@ -97,11 +97,11 @@ fun GameTestSequence.thenComputerOk(name: String? = null, marker: String = Compu
 
     thenWaitUntil {
         val computer = ComputerState.get(label)
-        if (computer == null || !computer.isDone(marker)) fail("Computer '$label' has not reached $marker yet.")
+        if (computer == null || !computer.isDone(marker)) abort("Computer '$label' has not reached $marker yet.")
     }
     thenExecuteFailFast {
         val error = ComputerState.get(label)!!.check(marker)
-        if (error != null) fail(error)
+        if (error != null) abort(error)
     }
     return this
 }
@@ -128,7 +128,7 @@ fun GameTestSequence.thenOnComputer(name: String? = null, action: suspend LuaTas
     thenWaitUntil {
         if (!monitor!!.isFinished) {
             val runningFor = (test as GameTestInfoAccessor).`computercraft$getTick`() - self.lastTick
-            fail("Computer '$label' has not finished yet (running for $runningFor ticks).")
+            abort("Computer '$label' has not finished yet (running for $runningFor ticks).")
         }
     }
     thenExecuteFailFast { monitor!!.check() }
@@ -155,25 +155,25 @@ fun GameTestHelper.immediate(run: () -> Unit) {
 // Helper functions for failing tests
 
 /** Raise a [GameTestAssertException]. */
-fun GameTestHelper.fail(message: String): Nothing = throw assertionException(Component.literal(message))
+fun GameTestHelper.abort(message: String): Nothing = throw assertionException(Component.literal(message))
 
 /** Raise a [GameTestAssertException] at a position. */
-fun GameTestHelper.fail(message: String, pos: BlockPos): Nothing =
+fun GameTestHelper.abort(message: String, pos: BlockPos): Nothing =
     throw assertionException(pos, Component.literal(message))
 
 /** Assert a condition is true, or raise a [GameTestAssertException] if not. */
 fun GameTestHelper.assertTrue(condition: Boolean, message: String) = assertTrue(condition, Component.literal(message))
 
 /** Raise a [GameTestAssertException]. */
-fun GameTestSequence.fail(message: String): Nothing =
+fun GameTestSequence.abort(message: String): Nothing =
     throw GameTestAssertException(
         Component.literal(message),
         ((this as GameTestSequenceAccessor).parent as GameTestInfoAccessor).`computercraft$getTick`(),
     )
 
 /** Fail with an optional context message. */
-private fun GameTestHelper.fail(message: String?, detail: String, pos: BlockPos): Nothing {
+private fun GameTestHelper.abort(message: String?, detail: String, pos: BlockPos): Nothing {
-    fail(if (message.isNullOrEmpty()) detail else "$message: $detail", pos)
+    abort(if (message.isNullOrEmpty()) detail else "$message: $detail", pos)
 }
 
 /**
@@ -186,7 +186,7 @@ fun GameTestHelper.assertBlockIs(pos: BlockPos, predicate: (BlockState) -> Boole
  */
 fun GameTestHelper.assertBlockIs(pos: BlockPos, predicate: (BlockState) -> Boolean, message: String) {
     val state = getBlockState(pos)
-    if (!predicate(state)) fail(message, state.toString(), pos)
+    if (!predicate(state)) abort(message, state.toString(), pos)
 }
 
 /**
@@ -196,9 +196,9 @@ fun <T : Comparable<T>> GameTestHelper.assertBlockHas(pos: BlockPos, property: P
     val state = getBlockState(pos)
     if (!state.hasProperty(property)) {
         val id = RegistryHelper.getKeyOrThrow(BuiltInRegistries.BLOCK, state.block)
-        fail(message, "block $id does not have property ${property.name}", pos)
+        abort(message, "block $id does not have property ${property.name}", pos)
     } else if (state.getValue(property) != value) {
-        fail(message, "${property.name} is ${state.getValue(property)}, expected $value", pos)
+        abort(message, "${property.name} is ${state.getValue(property)}, expected $value", pos)
     }
 }
 
@@ -208,8 +208,8 @@ fun <T : Comparable<T>> GameTestHelper.assertBlockHas(pos: BlockPos, property: P
 fun GameTestHelper.getContainerAt(pos: BlockPos): Container =
     when (val container: BlockEntity? = level.getBlockEntity(absolutePos(pos))) {
         is Container -> container
-        null -> fail("Expected a container at $pos, found nothing", pos)
+        null -> abort("Expected a container at $pos, found nothing", pos)
-        else -> fail("Expected a container at $pos, found ${getName(container.type)}", pos)
+        else -> abort("Expected a container at $pos, found ${getName(container.type)}", pos)
     }
 
 /**
@@ -254,7 +254,7 @@ private fun GameTestHelper.assertContainerExactlyImpl(pos: BlockPos, container:
 
     if (slot >= 0) {
         val invItems = (0 until container.containerSize).map { container.getItem(it) }.dropLastWhile { it.isEmpty }
-        fail(
+        abort(
             """
             Items do not match (first mismatch at slot $slot).
             Expected:  ${formatItems(items)}
@@ -278,15 +278,15 @@ fun GameTestHelper.assertPeripheral(pos: BlockPos, direction: Direction = Direct
     val peripheral = getPeripheralAt(pos, direction)
     val block = getBlockState(pos).block.name.string
     when {
-        peripheral == null -> fail("No peripheral for '$block'", pos)
+        peripheral == null -> abort("No peripheral for '$block'", pos)
-        peripheral.type != type -> fail("Peripheral for '$block' is of type ${peripheral.type}, expected $type", pos)
+        peripheral.type != type -> abort("Peripheral for '$block' is of type ${peripheral.type}, expected $type", pos)
     }
 }
 
 fun GameTestHelper.assertNoPeripheral(pos: BlockPos, direction: Direction = Direction.UP) {
     val peripheral = getPeripheralAt(pos, direction)
     val block = getBlockState(pos).block.name
-    if (peripheral != null) fail("Expected no peripheral for '$block', got a ${peripheral.type}", pos)
+    if (peripheral != null) abort("Expected no peripheral for '$block', got a ${peripheral.type}", pos)
 }
 
 fun GameTestHelper.assertExactlyItems(vararg expected: ItemStack, message: String? = null) {
@@ -295,7 +295,7 @@ fun GameTestHelper.assertExactlyItems(vararg expected: ItemStack, message: Strin
     if (!matcher.matches(actual)) {
         val description = StringDescription()
         matcher.describeMismatch(actual, description)
-        fail(if (message.isNullOrEmpty()) description.toString() else "$message: $description")
+        abort(if (message.isNullOrEmpty()) description.toString() else "$message: $description")
     }
 }
 
@@ -305,7 +305,7 @@ fun GameTestHelper.assertExactlyItems(vararg expected: ItemStack, message: Strin
 fun GameTestHelper.assertItemEntityCountIs(expected: Item, count: Int) {
     val actualCount = getEntities(EntityType.ITEM).sumOf { if (it.item.`is`(expected)) it.item.count else 0 }
     if (actualCount != count) {
-        fail("Expected $count ${ItemStack(expected).itemName.string} items to exist (found $actualCount)")
+        abort("Expected $count ${ItemStack(expected).itemName.string} items to exist (found $actualCount)")
     }
 }
 
@@ -318,9 +318,9 @@ private fun getName(type: BlockEntityType<*>): ResourceLocation =
 fun <T : Entity> GameTestHelper.getEntity(type: EntityType<T>): T {
     val entities = getEntities(type)
     when (entities.size) {
-        0 -> fail("No $type entities")
+        0 -> abort("No $type entities")
         1 -> return entities[0]
-        else -> fail("Multiple $type entities (${entities.size} in bounding box)")
+        else -> abort("Multiple $type entities (${entities.size} in bounding box)")
     }
 }
 
@@ -369,7 +369,7 @@ fun GameTestHelper.assertNotCraftable(vararg items: ItemStack) {
 
     val recipe = level.server.recipeManager.getRecipeFor(RecipeType.CRAFTING, input, level)
 
-    if (recipe.isPresent) fail("Expected no recipe to match $items")
+    if (recipe.isPresent) abort("Expected no recipe to match $items")
 }
 
 /**
@@ -381,7 +381,7 @@ fun GameTestHelper.craftItem(vararg items: ItemStack): ItemStack {
     val input = CraftingInput.of(3, 3, container)
 
     val recipe = level.server.recipeManager.getRecipeFor(RecipeType.CRAFTING, input, level).getOrNull()
-        ?: fail("No recipe matches $items")
+        ?: throw assertionException("No recipe matches $items")
     return recipe.value.assemble(input, level.registryAccess())
 }
 

projects/common/src/testMod/kotlin/dan200/computercraft/gametest/core/TestHooks.kt

@@ -75,7 +75,7 @@ object TestHooks {
     }
 
     fun getTestOrigin(server: MinecraftServer): BlockPos {
-        val spawn = server.overworld().sharedSpawnPos
+        val spawn = server.respawnData.pos()
         return BlockPos(spawn.x, -59, spawn.y)
     }
 

projects/fabric/build.gradle.kts

@@ -74,7 +74,6 @@ configurations {
 }
 
 dependencies {
-    clientCompileOnly(variantOf(libs.emi) { classifier("api") })
     modCompileOnly(libs.bundles.externalMods.fabric.compile) {
         exclude("net.fabricmc", "fabric-loader")
         exclude("net.fabricmc.fabric-api")

projects/fabric/src/client/java/dan200/computercraft/client/ComputerCraftClient.java

@@ -12,7 +12,6 @@ import dan200.computercraft.api.client.FabricComputerCraftAPIClient;
 import dan200.computercraft.client.platform.ClientNetworkContextImpl;
 import dan200.computercraft.client.platform.FabricModelKey;
 import dan200.computercraft.client.platform.ModelKey;
-import dan200.computercraft.core.util.Nullability;
 import dan200.computercraft.shared.ComputerCraft;
 import dan200.computercraft.shared.ModRegistry;
 import dan200.computercraft.shared.config.ConfigSpec;
@@ -25,12 +24,13 @@ import net.fabricmc.fabric.api.client.model.loading.v1.PreparableModelLoadingPlu
 import net.fabricmc.fabric.api.client.model.loading.v1.UnbakedExtraModel;
 import net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking;
 import net.fabricmc.fabric.api.client.rendering.v1.BlockRenderLayerMap;
+import net.fabricmc.fabric.api.client.rendering.v1.EntityModelLayerRegistry;
 import net.fabricmc.fabric.api.client.rendering.v1.SpecialGuiElementRegistry;
-import net.fabricmc.fabric.api.client.rendering.v1.WorldRenderEvents;
 import net.fabricmc.loader.api.FabricLoader;
 import net.minecraft.Util;
 import net.minecraft.client.Minecraft;
 import net.minecraft.client.color.item.ItemTintSources;
+import net.minecraft.client.gui.components.debug.DebugScreenEntries;
 import net.minecraft.client.gui.render.pip.PictureInPictureRenderer;
 import net.minecraft.client.gui.render.state.pip.PictureInPictureRenderState;
 import net.minecraft.client.gui.screens.MenuScreens;
@@ -41,7 +41,6 @@ import net.minecraft.client.renderer.item.properties.conditional.ConditionalItem
 import net.minecraft.client.renderer.item.properties.select.SelectItemModelProperties;
 import net.minecraft.client.resources.model.ModelBaker;
 import net.minecraft.client.resources.model.ResolvableModel;
-import net.minecraft.world.phys.BlockHitResult;
 
 import java.nio.file.Files;
 import java.nio.file.Path;
@@ -49,8 +48,6 @@ import java.util.function.BiConsumer;
 import java.util.function.BiFunction;
 import java.util.function.Function;
 
-import static dan200.computercraft.core.util.Nullability.assertNonNull;
-
 public class ComputerCraftClient {
     public static void init() {
         var clientNetwork = new ClientNetworkContextImpl();
@@ -67,9 +64,10 @@ public class ComputerCraftClient {
         ClientRegistry.registerItemColours(ItemTintSources.ID_MAPPER::put);
         ClientRegistry.registerSelectItemProperties(SelectItemModelProperties.ID_MAPPER::put);
         ClientRegistry.registerConditionalItemProperties(ConditionalItemModelProperties.ID_MAPPER::put);
+        ClientRegistry.registerLayerDefinitions((id, factory) -> EntityModelLayerRegistry.registerModelLayer(id, factory::get));
 
         PreparableModelLoadingPlugin.register(
-            ClientRegistry::gatherExtraModels,
+            (state, executor) -> ClientRegistry.gatherExtraModels(state.resourceManager(), executor),
             (state, context) -> ClientRegistry.registerExtraModels(new ClientRegistry.RegisterExtraModels() {
                 @Override
                 public <U, T> void register(ModelKey<T> key, U unbaked, BiConsumer<U, ResolvableModel.Resolver> resolve, BiFunction<U, ModelBaker, T> bake) {
@@ -93,6 +91,7 @@ public class ComputerCraftClient {
 
         ClientTickEvents.START_CLIENT_TICK.register(client -> ClientHooks.onTick());
         // This isn't 100% consistent with Forge, but not worth a mixin.
+        /*
         WorldRenderEvents.START.register(context -> ClientHooks.onRenderTick());
         WorldRenderEvents.BLOCK_OUTLINE.register((context, hitResult) -> {
             var hit = Minecraft.getInstance().hitResult;
@@ -102,6 +101,9 @@ public class ComputerCraftClient {
                 return true;
             }
         });
+        */
+
+        ClientRegistry.registerDebugScreenEntries(DebugScreenEntries::register);
 
         // Register our open folder command
         ClientCommandRegistrationCallback.EVENT.register((dispatcher, registryAccess) ->

projects/fabric/src/client/java/dan200/computercraft/mixin/client/DebugScreenOverlayMixin.java

@@ -1,23 +0,0 @@
-// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
-//
-// SPDX-License-Identifier: MPL-2.0
-
-package dan200.computercraft.mixin.client;
-
-import dan200.computercraft.client.ClientHooks;
-import net.minecraft.client.gui.components.DebugScreenOverlay;
-import org.spongepowered.asm.mixin.Mixin;
-import org.spongepowered.asm.mixin.injection.At;
-import org.spongepowered.asm.mixin.injection.Inject;
-import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
-
-import java.util.List;
-
-@Mixin(DebugScreenOverlay.class)
-class DebugScreenOverlayMixin {
-    @Inject(method = "getSystemInformation", at = @At("RETURN"))
-    @SuppressWarnings("UnusedMethod")
-    private void appendBlockDebugInfo(CallbackInfoReturnable<List<String>> cir) {
-        ClientHooks.addBlockDebugInfo(cir.getReturnValue()::add);
-    }
-}

projects/fabric/src/client/java/dan200/computercraft/mixin/client/ItemFrameRendererMixin.java

@@ -7,9 +7,10 @@ package dan200.computercraft.mixin.client;
 import com.mojang.blaze3d.vertex.PoseStack;
 import dan200.computercraft.client.ClientHooks;
 import dan200.computercraft.client.ExtendedItemFrameRenderStateHolder;
-import net.minecraft.client.renderer.MultiBufferSource;
+import net.minecraft.client.renderer.SubmitNodeCollector;
 import net.minecraft.client.renderer.entity.ItemFrameRenderer;
 import net.minecraft.client.renderer.entity.state.ItemFrameRenderState;
+import net.minecraft.client.renderer.state.CameraRenderState;
 import net.minecraft.world.entity.decoration.ItemFrame;
 import org.objectweb.asm.Opcodes;
 import org.spongepowered.asm.mixin.Mixin;
@@ -21,14 +22,14 @@ import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 @SuppressWarnings("UnusedMethod")
 class ItemFrameRendererMixin {
     @Inject(
-        method = "render(Lnet/minecraft/client/renderer/entity/state/ItemFrameRenderState;Lcom/mojang/blaze3d/vertex/PoseStack;Lnet/minecraft/client/renderer/MultiBufferSource;I)V",
+        method = "submit(Lnet/minecraft/client/renderer/entity/state/ItemFrameRenderState;Lcom/mojang/blaze3d/vertex/PoseStack;Lnet/minecraft/client/renderer/SubmitNodeCollector;Lnet/minecraft/client/renderer/state/CameraRenderState;)V",
         at = @At(value = "FIELD", target = "Lnet/minecraft/client/renderer/entity/state/ItemFrameRenderState;mapId:Lnet/minecraft/world/level/saveddata/maps/MapId;", opcode = Opcodes.GETFIELD, ordinal = 1),
         cancellable = true
     )
     @SuppressWarnings("unused")
-    private void render(ItemFrameRenderState frame, PoseStack pose, MultiBufferSource buffers, int light, CallbackInfo ci) {
+    private void submit(ItemFrameRenderState frame, PoseStack pose, SubmitNodeCollector buffers, CameraRenderState camera, CallbackInfo ci) {
         var state = ((ExtendedItemFrameRenderStateHolder) frame).computercraft$state();
-        if (ClientHooks.onRenderItemFrame(pose, buffers, frame, state, light)) {
+        if (ClientHooks.onRenderItemFrame(pose, buffers, frame, state)) {
             ci.cancel();
             pose.popPose();
         }

projects/fabric/src/client/java/dan200/computercraft/mixin/client/ItemInHandRendererMixin.java

@@ -8,7 +8,7 @@ import com.mojang.blaze3d.vertex.PoseStack;
 import dan200.computercraft.client.ClientHooks;
 import net.minecraft.client.player.AbstractClientPlayer;
 import net.minecraft.client.renderer.ItemInHandRenderer;
-import net.minecraft.client.renderer.MultiBufferSource;
+import net.minecraft.client.renderer.SubmitNodeCollector;
 import net.minecraft.world.InteractionHand;
 import net.minecraft.world.item.ItemStack;
 import org.spongepowered.asm.mixin.Mixin;
@@ -22,9 +22,9 @@ class ItemInHandRendererMixin {
     @SuppressWarnings("unused")
     private void onRenderItem(
         AbstractClientPlayer player, float partialTicks, float pitch, InteractionHand hand, float swingProgress, ItemStack stack,
-        float equippedProgress, PoseStack transform, MultiBufferSource buffer, int combinedLight, CallbackInfo ci
+        float equippedProgress, PoseStack transform, SubmitNodeCollector collector, int combinedLight, CallbackInfo ci
     ) {
-        if (ClientHooks.onRenderHeldItem(transform, buffer, combinedLight, hand, pitch, equippedProgress, swingProgress, stack)) {
+        if (ClientHooks.onRenderHeldItem(transform, collector, combinedLight, hand, pitch, equippedProgress, swingProgress, stack)) {
             ci.cancel();
         }
     }

projects/fabric/src/client/resources/computercraft-client.fabric.mixins.json

@@ -7,7 +7,6 @@
         "defaultRequire": 1
     },
     "client": [
-        "DebugScreenOverlayMixin",
         "ItemFrameRendererMixin",
         "ItemFrameRenderStateMixin",
         "ItemInHandRendererMixin",

projects/fabric/src/main/java/dan200/computercraft/shared/ComputerCraft.java

@@ -40,18 +40,14 @@ import net.fabricmc.fabric.api.lookup.v1.item.ItemApiLookup;
 import net.fabricmc.fabric.api.loot.v3.LootTableEvents;
 import net.fabricmc.fabric.api.networking.v1.PayloadTypeRegistry;
 import net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking;
-import net.fabricmc.fabric.api.resource.IdentifiableResourceReloadListener;
+import net.fabricmc.fabric.api.resource.v1.ResourceLoader;
-import net.fabricmc.fabric.api.resource.ResourceManagerHelper;
 import net.fabricmc.loader.api.FabricLoader;
 import net.minecraft.core.component.DataComponents;
 import net.minecraft.core.registries.BuiltInRegistries;
 import net.minecraft.network.FriendlyByteBuf;
 import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
-import net.minecraft.resources.ResourceLocation;
 import net.minecraft.server.level.ChunkLevel;
 import net.minecraft.server.packs.PackType;
-import net.minecraft.server.packs.resources.PreparableReloadListener;
-import net.minecraft.server.packs.resources.ResourceManager;
 import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.level.ItemLike;
 import net.minecraft.world.level.block.entity.BlockEntity;
@@ -59,8 +55,6 @@ import net.minecraft.world.level.block.entity.BlockEntityType;
 import net.minecraft.world.level.storage.LevelResource;
 import org.jspecify.annotations.Nullable;
 
-import java.util.concurrent.CompletableFuture;
-import java.util.concurrent.Executor;
 import java.util.function.BiFunction;
 
 public class ComputerCraft {
@@ -137,7 +131,7 @@ public class ComputerCraft {
             entries.getContext(), entries
         ));
 
-        CommonHooks.onDatapackReload((name, listener) -> ResourceManagerHelper.get(PackType.SERVER_DATA).registerReloadListener(new ReloadListener(name, listener)));
+        CommonHooks.onDatapackReload(ResourceLoader.get(PackType.SERVER_DATA)::registerReloader);
 
         FabricDetailRegistries.FLUID_VARIANT.addProvider(FluidDetails::fill);
 
@@ -152,20 +146,6 @@ public class ComputerCraft {
         registry.register(type.type(), type.codec());
     }
 
-    private record ReloadListener(ResourceLocation name, PreparableReloadListener listener)
-        implements IdentifiableResourceReloadListener {
-
-        @Override
-        public ResourceLocation getFabricId() {
-            return name;
-        }
-
-        @Override
-        public CompletableFuture<Void> reload(PreparationBarrier preparationBarrier, ResourceManager resourceManager, Executor backgroundExecutor, Executor gameExecutor) {
-            return listener.reload(preparationBarrier, resourceManager, backgroundExecutor, gameExecutor);
-        }
-    }
-
     private record BlockComponentImpl<T, C extends @Nullable Object>(
         BlockApiLookup<T, C> lookup
     ) implements ModRegistry.BlockComponent<T, C> {

projects/fabric/src/main/resources/fabric.mod.json

@@ -31,9 +31,6 @@
         ],
         "rei_client": [
             "dan200.computercraft.client.integration.rei.REIComputerCraftClient"
-        ],
-        "emi": [
-            "dan200.computercraft.client.integration.emi.EMIComputerCraft"
         ]
     },
     "mixins": [
@@ -49,9 +46,9 @@
         }
     ],
     "depends": {
-        "fabricloader": ">=0.16.14",
+        "fabricloader": ">=0.17.3",
-        "fabric-api": ">=0.128.0",
+        "fabric-api": ">=0.135.0",
-        "minecraft": "=1.21.7"
+        "minecraft": "=1.21.10"
     },
     "accessWidener": "computercraft.accesswidener"
 }

projects/forge/build.gradle.kts

@@ -53,6 +53,7 @@ neoForge {
 
         register("client") {
             client()
+            sourceSet = sourceSets.client
         }
 
         register("server") {
@@ -77,6 +78,7 @@ neoForge {
         register("data") {
             configureForData("computercraft", sourceSets.main.get())
             loadedMods = listOf(computercraftDatagen.get())
+            sourceSet = sourceSets.datagen
         }
 
         fun RunModel.configureForGameTest() {
@@ -87,6 +89,7 @@ neoForge {
 
             programArgument("--mixin.config=computercraft-gametest.mixins.json")
             loadedMods.add(testMod)
+            sourceSet = sourceSets.testMod
 
             jvmArgument("-ea")
         }
@@ -119,24 +122,12 @@ neoForge {
         register("exampleData") {
             configureForData("examplemod", sourceSets.examples.get())
             loadedMods.add(exampleMod.get())
+            sourceSet = sourceSets.examples
         }
     }
 }
 
 configurations {
-    additionalRuntimeClasspath { extendsFrom(jarJar.get()) }
-
-    val testAdditionalRuntimeClasspath by registering {
-        isCanBeResolved = true
-        isCanBeConsumed = false
-        // Prevent ending up with multiple versions of libraries on the classpath.
-        shouldResolveConsistentlyWith(additionalRuntimeClasspath.get())
-    }
-
-    for (testConfig in listOf("testClientAdditionalRuntimeClasspath", "gametestAdditionalRuntimeClasspath")) {
-        named(testConfig) { extendsFrom(testAdditionalRuntimeClasspath.get()) }
-    }
-
     register("testWithIris") {
         isCanBeConsumed = false
         isCanBeResolved = true
@@ -157,7 +148,6 @@ dependencies {
     compileOnly(libs.jetbrainsAnnotations)
     annotationProcessorEverywhere(libs.autoService)
 
-    clientCompileOnly(variantOf(libs.emi) { classifier("api") })
     compileOnly(libs.bundles.externalMods.forge.compile)
     clientRuntimeOnly(libs.bundles.externalMods.forge.runtime)
     compileOnly(libs.create.forge) { isTransitive = false }
@@ -169,11 +159,6 @@ dependencies {
 
     jarJar(libs.cobalt)
     jarJar(libs.jzlib)
-    // We don't jar-in-jar our additional netty dependencies (see the tasks.jarJar configuration), but still want them
-    // on the legacy classpath.
-    additionalRuntimeClasspath(libs.netty.http) { isTransitive = false }
-    additionalRuntimeClasspath(libs.netty.socks) { isTransitive = false }
-    additionalRuntimeClasspath(libs.netty.proxy) { isTransitive = false }
 
     testFixturesApi(libs.bundles.test)
     testFixturesApi(libs.bundles.kotlin)
@@ -186,10 +171,6 @@ dependencies {
     testModImplementation(testFixtures(project(":core")))
     testModImplementation(testFixtures(project(":forge")))
 
-    // Ensure our test fixture dependencies are on the classpath
-    "testAdditionalRuntimeClasspath"(libs.bundles.kotlin)
-    "testAdditionalRuntimeClasspath"(libs.bundles.test)
-
     testFixturesImplementation(testFixtures(project(":core")))
 
     "testWithIris"(libs.iris.forge)

projects/forge/src/client/java/dan200/computercraft/client/ForgeClientHooks.java

@@ -44,21 +44,17 @@ public final class ForgeClientHooks {
     }
 
     @SubscribeEvent
-    public static void drawHighlight(RenderHighlightEvent.Block event) {
+    public static void drawHighlight(ExtractBlockOutlineRenderStateEvent event) {
-        if (ClientHooks.drawHighlight(event.getPoseStack(), event.getMultiBufferSource(), event.getCamera(), event.getTarget())) {
+        // TODO: Highlighting. Need to see what Fabric is doing here.
+        /*if (ClientHooks.drawHighlight(event.getPoseStack(), event.getMultiBufferSource(), event.getCamera(), event.getTarget())) {
             event.setCanceled(true);
-        }
+        }*/
-    }
-
-    @SubscribeEvent
-    public static void onRenderText(CustomizeGuiOverlayEvent.DebugText event) {
-        ClientHooks.addBlockDebugInfo(event.getRight()::add);
     }
 
     @SubscribeEvent
     public static void onRenderInHand(RenderHandEvent event) {
         if (ClientHooks.onRenderHeldItem(
-            event.getPoseStack(), event.getMultiBufferSource(), event.getPackedLight(),
+            event.getPoseStack(), event.getSubmitNodeCollector(), event.getPackedLight(),
             event.getHand(), event.getInterpolatedPitch(), event.getEquipProgress(), event.getSwingProgress(), event.getItemStack()
         )) {
             event.setCanceled(true);
@@ -70,7 +66,7 @@ public final class ForgeClientHooks {
     public static void onRenderInFrame(RenderItemInFrameEvent event) {
         var state = event.getItemFrameRenderState().getRenderData(ITEM_FRAME_STATE);
         if (state != null && ClientHooks.onRenderItemFrame(
-            event.getPoseStack(), event.getMultiBufferSource(), event.getItemFrameRenderState(), state, event.getPackedLight()
+            event.getPoseStack(), event.getSubmitNodeCollector(), event.getItemFrameRenderState(), state
         )) {
             event.setCanceled(true);
         }

projects/forge/src/client/java/dan200/computercraft/client/ForgeClientRegistry.java

@@ -107,11 +107,18 @@ public final class ForgeClientRegistry {
         });
     }
 
+    @SubscribeEvent
+    public static void registerLayerDefinitions(EntityRenderersEvent.RegisterLayerDefinitions event) {
+        ClientRegistry.registerLayerDefinitions(event::registerLayerDefinition);
+    }
+
     @SubscribeEvent
     public static void registerPictureInPictureRenderers(RegisterPictureInPictureRenderersEvent event) {
         ClientRegistry.registerPictureInPictureRenderers(event::register);
     }
 
+    // TODO(1.21.10): ClientRegistry.registerDebugScreenEntries once https://github.com/neoforged/NeoForge/pull/2699 is merged
+
     @SubscribeEvent
     public static void setupClient(FMLClientSetupEvent event) {
         ClientRegistry.register();

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

@@ -12,6 +12,7 @@ import dan200.computercraft.api.network.wired.WiredElementCapability;
 import dan200.computercraft.api.peripheral.PeripheralCapability;
 import dan200.computercraft.api.pocket.IPocketUpgrade;
 import dan200.computercraft.api.turtle.ITurtleUpgrade;
+import dan200.computercraft.impl.Peripherals;
 import dan200.computercraft.impl.PocketUpgrades;
 import dan200.computercraft.impl.TurtleUpgrades;
 import dan200.computercraft.shared.CommonHooks;
@@ -51,13 +52,13 @@ import net.neoforged.neoforge.capabilities.Capabilities;
 import net.neoforged.neoforge.capabilities.ItemCapability;
 import net.neoforged.neoforge.capabilities.RegisterCapabilitiesEvent;
 import net.neoforged.neoforge.event.BuildCreativeModeTabContentsEvent;
-import net.neoforged.neoforge.items.wrapper.InvWrapper;
-import net.neoforged.neoforge.items.wrapper.SidedInvWrapper;
 import net.neoforged.neoforge.network.event.RegisterPayloadHandlersEvent;
 import net.neoforged.neoforge.network.registration.PayloadRegistrar;
 import net.neoforged.neoforge.registries.DataPackRegistryEvent;
 import net.neoforged.neoforge.registries.NewRegistryEvent;
 import net.neoforged.neoforge.registries.RegistryBuilder;
+import net.neoforged.neoforge.transfer.item.VanillaContainerWrapper;
+import net.neoforged.neoforge.transfer.item.WorldlyContainerWrapper;
 import org.jspecify.annotations.Nullable;
 
 import java.nio.file.Path;
@@ -112,9 +113,9 @@ public final class ComputerCraft {
         ComputerCraftAPI.registerGenericSource(new FluidMethods());
         ComputerCraftAPI.registerGenericSource(new EnergyMethods());
 
-        ForgeComputerCraftAPI.registerGenericCapability(Capabilities.ItemHandler.BLOCK);
+        Peripherals.addGenericLookup(InventoryMethods::extractContainer);
-        ForgeComputerCraftAPI.registerGenericCapability(Capabilities.FluidHandler.BLOCK);
+        Peripherals.addGenericLookup(FluidMethods::extractContainer);
-        ForgeComputerCraftAPI.registerGenericCapability(Capabilities.EnergyStorage.BLOCK);
+        ForgeComputerCraftAPI.registerGenericCapability(Capabilities.Energy.BLOCK);
 
         ForgeDetailRegistries.FLUID_STACK.addProvider(FluidData::fill);
 
@@ -155,12 +156,12 @@ public final class ComputerCraft {
             ModRegistry.BlockEntities.DISK_DRIVE
         );
         for (var inv : unsidedContainers) {
-            event.registerBlockEntity(Capabilities.ItemHandler.BLOCK, inv.get(), (be, side) -> new InvWrapper(be));
+            event.registerBlockEntity(Capabilities.Item.BLOCK, inv.get(), (be, side) -> VanillaContainerWrapper.of(be));
         }
 
         event.registerBlockEntity(
-            Capabilities.ItemHandler.BLOCK, ModRegistry.BlockEntities.PRINTER.get(),
+            Capabilities.Item.BLOCK, ModRegistry.BlockEntities.PRINTER.get(),
-            (be, side) -> side == null ? new InvWrapper(be) : new SidedInvWrapper(be, side)
+            (be, side) -> side == null ? VanillaContainerWrapper.of(be) : new WorldlyContainerWrapper(be, side)
         );
     }
 

projects/forge/src/main/java/dan200/computercraft/shared/peripheral/generic/methods/EnergyMethods.java

@@ -5,21 +5,21 @@
 package dan200.computercraft.shared.peripheral.generic.methods;
 
 import dan200.computercraft.api.lua.LuaFunction;
-import net.neoforged.neoforge.energy.IEnergyStorage;
+import net.neoforged.neoforge.transfer.energy.EnergyHandler;
 
 /**
- * Fluid methods for Forge's {@link IEnergyStorage}.
+ * Fluid methods for Forge's {@link EnergyHandler}.
  */
-public final class EnergyMethods extends AbstractEnergyMethods<IEnergyStorage> {
+public final class EnergyMethods extends AbstractEnergyMethods<EnergyHandler> {
     @Override
     @LuaFunction(mainThread = true)
-    public int getEnergy(IEnergyStorage energy) {
+    public long getEnergy(EnergyHandler energy) {
-        return energy.getEnergyStored();
+        return energy.getAmountAsLong();
     }
 
     @Override
     @LuaFunction(mainThread = true)
-    public int getEnergyCapacity(IEnergyStorage energy) {
+    public long getEnergyCapacity(EnergyHandler energy) {
-        return energy.getMaxEnergyStored();
+        return energy.getCapacityAsLong();
     }
 }

projects/forge/src/main/java/dan200/computercraft/shared/peripheral/generic/methods/FluidMethods.java

@@ -10,31 +10,41 @@ import dan200.computercraft.api.lua.LuaFunction;
 import dan200.computercraft.api.peripheral.IComputerAccess;
 import dan200.computercraft.api.peripheral.IPeripheral;
 import dan200.computercraft.shared.util.CapabilityUtil;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
 import net.minecraft.core.registries.BuiltInRegistries;
 import net.minecraft.server.level.ServerLevel;
 import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.material.Fluid;
 import net.neoforged.neoforge.capabilities.Capabilities;
-import net.neoforged.neoforge.fluids.FluidStack;
+import net.neoforged.neoforge.transfer.ResourceHandler;
-import net.neoforged.neoforge.fluids.capability.IFluidHandler;
+import net.neoforged.neoforge.transfer.ResourceHandlerUtil;
+import net.neoforged.neoforge.transfer.fluid.FluidResource;
 import org.jspecify.annotations.Nullable;
 
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Optional;
+import java.util.function.Predicate;
 
 import static dan200.computercraft.shared.util.ArgumentHelpers.getRegistryEntry;
 
 /**
- * Fluid methods for Forge's {@link IFluidHandler}.
+ * Fluid methods for Forge's fluid {@link ResourceHandler}.
  */
-public final class FluidMethods extends AbstractFluidMethods<IFluidHandler> {
+public final class FluidMethods extends AbstractFluidMethods<FluidMethods.StorageWrapper> {
+    public record StorageWrapper(ResourceHandler<FluidResource> storage) {
+    }
+
     @Override
     @LuaFunction(mainThread = true)
-    public Map<Integer, Map<String, ?>> tanks(IFluidHandler fluids) {
+    public Map<Integer, Map<String, ?>> tanks(FluidMethods.StorageWrapper wrapper) {
+        var storage = wrapper.storage();
         Map<Integer, Map<String, ?>> result = new HashMap<>();
-        var size = fluids.getTanks();
+        var size = storage.size();
         for (var i = 0; i < size; i++) {
-            var stack = fluids.getFluidInTank(i);
+            var stack = storage.getResource(i).toStack(storage.getAmountAsInt(i));
             if (!stack.isEmpty()) result.put(i + 1, ForgeDetailRegistries.FLUID_STACK.getBasicDetails(stack));
         }
 
@@ -44,7 +54,7 @@ public final class FluidMethods extends AbstractFluidMethods<IFluidHandler> {
     @Override
     @LuaFunction(mainThread = true)
     public int pushFluid(
-        IFluidHandler from, IComputerAccess computer,
+        FluidMethods.StorageWrapper from, IComputerAccess computer,
         String toName, Optional<Integer> limit, Optional<String> fluidName
     ) throws LuaException {
         var fluid = fluidName.isPresent()
@@ -61,15 +71,13 @@ public final class FluidMethods extends AbstractFluidMethods<IFluidHandler> {
         int actualLimit = limit.orElse(Integer.MAX_VALUE);
         if (actualLimit <= 0) throw new LuaException("Limit must be > 0");
 
-        return fluid == null
+        return moveFluid(from.storage(), to, fluid, actualLimit);
-            ? moveFluid(from, actualLimit, to)
-            : moveFluid(from, new FluidStack(fluid, actualLimit), to);
     }
 
     @Override
     @LuaFunction(mainThread = true)
     public int pullFluid(
-        IFluidHandler to, IComputerAccess computer,
+        FluidMethods.StorageWrapper to, IComputerAccess computer,
         String fromName, Optional<Integer> limit, Optional<String> fluidName
     ) throws LuaException {
         var fluid = fluidName.isPresent()
@@ -86,13 +94,16 @@ public final class FluidMethods extends AbstractFluidMethods<IFluidHandler> {
         int actualLimit = limit.orElse(Integer.MAX_VALUE);
         if (actualLimit <= 0) throw new LuaException("Limit must be > 0");
 
-        return fluid == null
+        return moveFluid(from, to.storage(), fluid, actualLimit);
-            ? moveFluid(from, actualLimit, to)
+    }
-            : moveFluid(from, new FluidStack(fluid, actualLimit), to);
+
+    public static @Nullable StorageWrapper extractContainer(ServerLevel level, BlockPos pos, BlockState state, @Nullable BlockEntity blockEntity, @Nullable Direction direction) {
+        var storage = CapabilityUtil.getCapability(level, Capabilities.Fluid.BLOCK, pos, state, blockEntity, direction);
+        return storage == null ? null : new StorageWrapper(storage);
     }
 
     @Nullable
-    private static IFluidHandler extractHandler(IPeripheral peripheral) {
+    private static ResourceHandler<FluidResource> extractHandler(IPeripheral peripheral) {
         var object = peripheral.getTarget();
         var direction = peripheral instanceof dan200.computercraft.shared.peripheral.generic.GenericPeripheral sided ? sided.side() : null;
 
@@ -102,11 +113,10 @@ public final class FluidMethods extends AbstractFluidMethods<IFluidHandler> {
             var level = blockEntity.getLevel();
             if (!(level instanceof ServerLevel serverLevel)) return null;
 
-            var result = CapabilityUtil.getCapability(serverLevel, Capabilities.FluidHandler.BLOCK, blockEntity.getBlockPos(), blockEntity.getBlockState(), blockEntity, direction);
+            var result = CapabilityUtil.getCapability(serverLevel, Capabilities.Fluid.BLOCK, blockEntity.getBlockPos(), blockEntity.getBlockState(), blockEntity, direction);
             if (result != null) return result;
         }
 
-        if (object instanceof IFluidHandler handler) return handler;
         return null;
     }
 
@@ -114,49 +124,14 @@ public final class FluidMethods extends AbstractFluidMethods<IFluidHandler> {
      * Move fluid from one handler to another.
      *
      * @param from  The handler to move from.
+     * @param fluid The fluid to extract.
      * @param limit The maximum amount of fluid to move.
      * @param to    The handler to move to.
      * @return The amount of fluid moved.
      */
-    private static int moveFluid(IFluidHandler from, int limit, IFluidHandler to) {
+    private static int moveFluid(ResourceHandler<FluidResource> from, ResourceHandler<FluidResource> to, @Nullable Fluid fluid, int limit) {
-        return moveFluid(from, from.drain(limit, IFluidHandler.FluidAction.SIMULATE), limit, to);
+        Predicate<FluidResource> predicate = fluid == null ? x -> true : x -> x.is(fluid);
-    }
+        var moved = ResourceHandlerUtil.moveFirst(from, to, predicate, limit, null);
-
+        return moved == null ? 0 : moved.amount();
-    /**
-     * Move fluid from one handler to another.
-     *
-     * @param from  The handler to move from.
-     * @param fluid The fluid and limit to move.
-     * @param to    The handler to move to.
-     * @return The amount of fluid moved.
-     */
-    private static int moveFluid(IFluidHandler from, FluidStack fluid, IFluidHandler to) {
-        return moveFluid(from, from.drain(fluid, IFluidHandler.FluidAction.SIMULATE), fluid.getAmount(), to);
-    }
-
-    /**
-     * Move fluid from one handler to another.
-     *
-     * @param from      The handler to move from.
-     * @param extracted The fluid which is extracted from {@code from}.
-     * @param limit     The maximum amount of fluid to move.
-     * @param to        The handler to move to.
-     * @return The amount of fluid moved.
-     */
-    private static int moveFluid(IFluidHandler from, FluidStack extracted, int limit, IFluidHandler to) {
-        if (extracted.getAmount() <= 0) return 0;
-
-        // Limit the amount to extract.
-        extracted = extracted.copy();
-        extracted.setAmount(Math.min(extracted.getAmount(), limit));
-
-        var inserted = to.fill(extracted.copy(), IFluidHandler.FluidAction.EXECUTE);
-        if (inserted <= 0) return 0;
-
-        // Remove the item from the original inventory. Technically this could fail, but there's little we can do
-        // about that.
-        extracted.setAmount(inserted);
-        from.drain(extracted, IFluidHandler.FluidAction.EXECUTE);
-        return inserted;
     }
 }

projects/forge/src/main/java/dan200/computercraft/shared/peripheral/generic/methods/InventoryMethods.java

@@ -11,12 +11,17 @@ import dan200.computercraft.api.peripheral.IComputerAccess;
 import dan200.computercraft.api.peripheral.IPeripheral;
 import dan200.computercraft.shared.platform.ForgeContainerTransfer;
 import dan200.computercraft.shared.util.CapabilityUtil;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
 import net.minecraft.server.level.ServerLevel;
 import net.minecraft.world.Container;
+import net.minecraft.world.item.Items;
 import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.block.state.BlockState;
 import net.neoforged.neoforge.capabilities.Capabilities;
-import net.neoforged.neoforge.items.IItemHandler;
+import net.neoforged.neoforge.transfer.ResourceHandler;
-import net.neoforged.neoforge.items.wrapper.InvWrapper;
+import net.neoforged.neoforge.transfer.item.ItemResource;
+import net.neoforged.neoforge.transfer.item.VanillaContainerWrapper;
 import org.jspecify.annotations.Nullable;
 
 import java.util.HashMap;
@@ -26,22 +31,26 @@ import java.util.Optional;
 import static dan200.computercraft.core.util.ArgumentHelpers.assertBetween;
 
 /**
- * Inventory methods for Forge's {@link IItemHandler}.
+ * Inventory methods for Forge's {@link ResourceHandler}.
  */
-public final class InventoryMethods extends AbstractInventoryMethods<IItemHandler> {
+public final class InventoryMethods extends AbstractInventoryMethods<InventoryMethods.StorageWrapper> {
-    @Override
+    public record StorageWrapper(ResourceHandler<ItemResource> storage) {
-    @LuaFunction(mainThread = true)
-    public int size(IItemHandler inventory) {
-        return inventory.getSlots();
     }
 
     @Override
     @LuaFunction(mainThread = true)
-    public Map<Integer, Map<String, ?>> list(IItemHandler inventory) {
+    public int size(StorageWrapper inventory) {
+        return inventory.storage().size();
+    }
+
+    @Override
+    @LuaFunction(mainThread = true)
+    public Map<Integer, Map<String, ?>> list(StorageWrapper wrapper) {
+        var storage = wrapper.storage();
         Map<Integer, Map<String, ?>> result = new HashMap<>();
-        var size = inventory.getSlots();
+        var size = storage.size();
         for (var i = 0; i < size; i++) {
-            var stack = inventory.getStackInSlot(i);
+            var stack = storage.getResource(i).toStack(storage.getAmountAsInt(i));
             if (!stack.isEmpty()) result.put(i + 1, VanillaDetailRegistries.ITEM_STACK.getBasicDetails(stack));
         }
 
@@ -51,24 +60,29 @@ public final class InventoryMethods extends AbstractInventoryMethods<IItemHandle
     @Override
     @Nullable
     @LuaFunction(mainThread = true)
-    public Map<String, ?> getItemDetail(IItemHandler inventory, int slot) throws LuaException {
+    public Map<String, ?> getItemDetail(StorageWrapper wrapper, int slot) throws LuaException {
-        assertBetween(slot, 1, inventory.getSlots(), "Slot out of range (%s)");
+        var storage = wrapper.storage();
+        assertBetween(slot, 1, storage.size(), "Slot out of range (%s)");
 
-        var stack = inventory.getStackInSlot(slot - 1);
+        var stack = storage.getResource(slot - 1).toStack(storage.getAmountAsInt(slot - 1));
         return stack.isEmpty() ? null : VanillaDetailRegistries.ITEM_STACK.getDetails(stack);
     }
 
     @Override
     @LuaFunction(mainThread = true)
-    public long getItemLimit(IItemHandler inventory, int slot) throws LuaException {
+    public long getItemLimit(StorageWrapper wrapper, int slot) throws LuaException {
-        assertBetween(slot, 1, inventory.getSlots(), "Slot out of range (%s)");
+        var storage = wrapper.storage();
-        return inventory.getSlotLimit(slot - 1);
+        assertBetween(slot, 1, storage.size(), "Slot out of range (%s)");
+
+        // FIXME: The capacity will be 0 if the resource is empty (or not valid). If empty, we try with dirt.
+        var item = storage.getResource(slot - 1);
+        return storage.getCapacityAsLong(slot - 1, item.isEmpty() ? ItemResource.of(Items.DIRT) : item);
     }
 
     @Override
     @LuaFunction(mainThread = true)
     public int pushItems(
-        IItemHandler from, IComputerAccess computer,
+        StorageWrapper from, IComputerAccess computer,
         String toName, int fromSlot, Optional<Integer> limit, Optional<Integer> toSlot
     ) throws LuaException {
         // Find location to transfer to
@@ -80,17 +94,17 @@ public final class InventoryMethods extends AbstractInventoryMethods<IItemHandle
 
         // Validate slots
         int actualLimit = limit.orElse(Integer.MAX_VALUE);
-        assertBetween(fromSlot, 1, from.getSlots(), "From slot out of range (%s)");
+        assertBetween(fromSlot, 1, from.storage().size(), "From slot out of range (%s)");
-        if (toSlot.isPresent()) assertBetween(toSlot.get(), 1, to.getSlots(), "To slot out of range (%s)");
+        if (toSlot.isPresent()) assertBetween(toSlot.get(), 1, to.size(), "To slot out of range (%s)");
 
         if (actualLimit <= 0) return 0;
-        return moveItem(from, fromSlot - 1, to, toSlot.orElse(0) - 1, actualLimit);
+        return moveItem(from.storage(), fromSlot - 1, to, toSlot.orElse(0) - 1, actualLimit);
     }
 
     @Override
     @LuaFunction(mainThread = true)
     public int pullItems(
-        IItemHandler to, IComputerAccess computer,
+        StorageWrapper to, IComputerAccess computer,
         String fromName, int fromSlot, Optional<Integer> limit, Optional<Integer> toSlot
     ) throws LuaException {
         // Find location to transfer to
@@ -102,15 +116,20 @@ public final class InventoryMethods extends AbstractInventoryMethods<IItemHandle
 
         // Validate slots
         int actualLimit = limit.orElse(Integer.MAX_VALUE);
-        assertBetween(fromSlot, 1, from.getSlots(), "From slot out of range (%s)");
+        assertBetween(fromSlot, 1, from.size(), "From slot out of range (%s)");
-        if (toSlot.isPresent()) assertBetween(toSlot.get(), 1, to.getSlots(), "To slot out of range (%s)");
+        if (toSlot.isPresent()) assertBetween(toSlot.get(), 1, to.storage().size(), "To slot out of range (%s)");
 
         if (actualLimit <= 0) return 0;
-        return moveItem(from, fromSlot - 1, to, toSlot.orElse(0) - 1, actualLimit);
+        return moveItem(from, fromSlot - 1, to.storage(), toSlot.orElse(0) - 1, actualLimit);
+    }
+
+    public static @Nullable StorageWrapper extractContainer(ServerLevel level, BlockPos pos, BlockState state, @Nullable BlockEntity blockEntity, @Nullable Direction direction) {
+        var storage = CapabilityUtil.getCapability(level, Capabilities.Item.BLOCK, pos, state, blockEntity, direction);
+        return storage == null ? null : new StorageWrapper(storage);
     }
 
     @Nullable
-    private static IItemHandler extractHandler(IPeripheral peripheral) {
+    private static ResourceHandler<ItemResource> extractHandler(IPeripheral peripheral) {
         var object = peripheral.getTarget();
         var direction = peripheral instanceof dan200.computercraft.shared.peripheral.generic.GenericPeripheral sided ? sided.side() : null;
 
@@ -120,12 +139,11 @@ public final class InventoryMethods extends AbstractInventoryMethods<IItemHandle
             var level = blockEntity.getLevel();
             if (!(level instanceof ServerLevel serverLevel)) return null;
 
-            var result = CapabilityUtil.getCapability(serverLevel, Capabilities.ItemHandler.BLOCK, blockEntity.getBlockPos(), blockEntity.getBlockState(), blockEntity, direction);
+            var result = CapabilityUtil.getCapability(serverLevel, Capabilities.Item.BLOCK, blockEntity.getBlockPos(), blockEntity.getBlockState(), blockEntity, direction);
             if (result != null) return result;
         }
 
-        if (object instanceof IItemHandler handler) return handler;
+        if (object instanceof Container container) return VanillaContainerWrapper.of(container);
-        if (object instanceof Container container) return new InvWrapper(container);
         return null;
     }
 
@@ -139,7 +157,7 @@ public final class InventoryMethods extends AbstractInventoryMethods<IItemHandle
      * @param limit    The max number to move. {@link Integer#MAX_VALUE} for no limit.
      * @return The number of items moved.
      */
-    private static int moveItem(IItemHandler from, int fromSlot, IItemHandler to, int toSlot, final int limit) {
+    private static int moveItem(ResourceHandler<ItemResource> from, int fromSlot, ResourceHandler<ItemResource> to, int toSlot, final int limit) {
         var fromWrapper = new ForgeContainerTransfer(from).singleSlot(fromSlot);
         var toWrapper = new ForgeContainerTransfer(to);
         if (toSlot >= 0) toWrapper = toWrapper.singleSlot(toSlot);

projects/forge/src/main/java/dan200/computercraft/shared/platform/FakePlayerExt.java

@@ -8,10 +8,10 @@ import com.mojang.authlib.GameProfile;
 import net.minecraft.server.level.ServerLevel;
 import net.minecraft.server.level.ServerPlayer;
 import net.minecraft.world.MenuProvider;
-import net.minecraft.world.entity.Entity;
 import net.minecraft.world.entity.EntityDimensions;
 import net.minecraft.world.entity.Pose;
 import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.level.GameType;
 import net.neoforged.neoforge.common.util.FakePlayer;
 import org.jspecify.annotations.Nullable;
 
@@ -23,6 +23,9 @@ class FakePlayerExt extends FakePlayer {
     FakePlayerExt(ServerLevel serverLevel, GameProfile profile) {
         super(serverLevel, profile);
         refreshDimensions();
+        // Force the player to be in survival. Only needed for NF, as Fabric does this by default.
+        // TODO: Remove once https://github.com/neoforged/NeoForge/pull/2730 is merged.
+        gameMode.changeGameModeForPlayer(GameType.SURVIVAL);
     }
 
     @Override
@@ -35,11 +38,6 @@ class FakePlayerExt extends FakePlayer {
         return OptionalInt.empty();
     }
 
-    @Override
-    public boolean startRiding(Entity vehicle, boolean force) {
-        return false;
-    }
-
     @Override
     public EntityDimensions getDefaultDimensions(Pose pose) {
         return DIMENSIONS;

projects/forge/src/main/java/dan200/computercraft/shared/platform/ForgeContainerTransfer.java

@@ -4,20 +4,21 @@
 
 package dan200.computercraft.shared.platform;
 
-import net.minecraft.world.item.ItemStack;
+import net.neoforged.neoforge.transfer.ResourceHandler;
-import net.neoforged.neoforge.items.IItemHandler;
+import net.neoforged.neoforge.transfer.item.ItemResource;
+import net.neoforged.neoforge.transfer.transaction.Transaction;
 
 public class ForgeContainerTransfer implements ContainerTransfer.Slotted {
-    private final IItemHandler handler;
+    private final ResourceHandler<ItemResource> handler;
     private final int offset;
     private final int limit;
     private final int slots;
 
-    public ForgeContainerTransfer(IItemHandler handler) {
+    public ForgeContainerTransfer(ResourceHandler<ItemResource> handler) {
-        this(handler, 0, handler.getSlots(), handler.getSlots());
+        this(handler, 0, handler.size(), handler.size());
     }
 
-    public ForgeContainerTransfer(IItemHandler handler, int offset, int limit, int slots) {
+    public ForgeContainerTransfer(ResourceHandler<ItemResource> handler, int offset, int limit, int slots) {
         this.handler = handler;
         this.offset = offset;
         this.limit = limit;
@@ -48,43 +49,45 @@ public class ForgeContainerTransfer implements ContainerTransfer.Slotted {
     }
 
     public static int moveItem(ForgeContainerTransfer src, ForgeContainerTransfer dest, int maxAmount) {
-        var targetSlot = 0;
+        var hasItem = false;
 
-        var movedStack = ItemStack.EMPTY;
-        var moved = 0;
-
-        outer:
         for (var srcSlot = 0; srcSlot < src.limit; srcSlot++) {
             var actualSrcSlot = src.mapSlot(srcSlot);
-            var stack = src.handler.extractItem(actualSrcSlot, maxAmount, true);
+            var resource = src.handler.getResource(actualSrcSlot);
-            if (stack.isEmpty()) continue;
+            if (resource.isEmpty()) continue;
 
-            // Pick the first item in the inventory to be the one we transfer, skipping those that match.
+            // Check how much can be extracted and inserted.
-            if (movedStack.isEmpty()) {
+            int maxExtracted;
-                movedStack = stack.copy();
+            try (var transaction = Transaction.openRoot()) {
-                if (stack.getMaxStackSize() < maxAmount) maxAmount = stack.getMaxStackSize();
+                maxExtracted = src.handler.extract(actualSrcSlot, resource, maxAmount, transaction);
-            } else if (!ItemStack.isSameItemSameComponents(stack, movedStack)) {
+            }
-                continue;
+            if (maxExtracted == 0) continue;
+
+            hasItem = true;
+
+            try (var transaction = Transaction.openRoot()) {
+                // check how much can be inserted
+                var accepted = dest.insert(resource, maxExtracted, transaction);
+                if (accepted == 0) continue;
+
+                // Extract or rollback.
+                if (src.handler.extract(actualSrcSlot, resource, accepted, transaction) == accepted) {
+                    transaction.commit();
+                    return accepted;
+                }
             }
 
-            for (; targetSlot < dest.limit; targetSlot++) {
-                var oldCount = stack.getCount();
-                stack = dest.handler.insertItem(dest.mapSlot(targetSlot), stack, false);
-
-                var transferred = oldCount - stack.getCount();
-                var extracted = src.handler.extractItem(actualSrcSlot, transferred, false);
-
-                moved += transferred;
-
-                // We failed to extract as much as we should have. This should never happen, but goodness knows.
-                if (extracted.getCount() < transferred) break outer;
-
-                if (moved >= maxAmount) return moved;
-                if (stack.isEmpty()) break;
-            }
         }
 
-        if (moved == 0) return movedStack.isEmpty() ? NO_ITEMS : NO_SPACE;
+        return hasItem ? NO_SPACE : NO_ITEMS;
-        return moved;
+    }
+
+    private int insert(ItemResource item, int amount, Transaction transaction) {
+        var inserted = 0;
+        for (var i = 0; i < limit; i++) {
+            inserted += handler.insert(mapSlot(i), item, amount - inserted, transaction);
+            if (inserted == amount) break;
+        }
+        return inserted;
     }
 }

projects/forge/src/main/java/dan200/computercraft/shared/platform/PlatformHelperImpl.java

@@ -61,9 +61,9 @@ import net.neoforged.neoforge.common.ItemAbilities;
 import net.neoforged.neoforge.common.Tags;
 import net.neoforged.neoforge.common.extensions.IMenuTypeExtension;
 import net.neoforged.neoforge.event.EventHooks;
-import net.neoforged.neoforge.items.wrapper.InvWrapper;
 import net.neoforged.neoforge.registries.DeferredHolder;
 import net.neoforged.neoforge.registries.DeferredRegister;
+import net.neoforged.neoforge.transfer.item.VanillaContainerWrapper;
 import org.jspecify.annotations.Nullable;
 
 import java.nio.file.Path;
@@ -128,17 +128,17 @@ public class PlatformHelperImpl implements PlatformHelper {
 
     @Override
     public ContainerTransfer.Slotted wrapContainer(Container container) {
-        return new ForgeContainerTransfer(new InvWrapper(container));
+        return new ForgeContainerTransfer(VanillaContainerWrapper.of(container));
     }
 
     @Nullable
     @Override
     public ContainerTransfer getContainer(ServerLevel level, BlockPos pos, Direction side) {
-        var inventory = level.getCapability(Capabilities.ItemHandler.BLOCK, pos, side);
+        var inventory = level.getCapability(Capabilities.Item.BLOCK, pos, side);
         if (inventory != null) return new ForgeContainerTransfer(inventory);
 
         var entity = InventoryUtil.getEntityContainer(level, pos, side);
-        return entity == null ? null : new ForgeContainerTransfer(new InvWrapper(entity));
+        return entity == null ? null : new ForgeContainerTransfer(VanillaContainerWrapper.of(entity));
     }
 
     @Override

projects/forge/src/main/resources/META-INF/accesstransformer.cfg

@@ -7,8 +7,8 @@ public net.minecraft.client.gui.components.ChatComponent allMessages
 
 # ItemPocketRenderer/ItemPrintoutRenderer
 public net.minecraft.client.renderer.ItemInHandRenderer calculateMapTilt(F)F
-public net.minecraft.client.renderer.ItemInHandRenderer renderMapHand(Lcom/mojang/blaze3d/vertex/PoseStack;Lnet/minecraft/client/renderer/MultiBufferSource;ILnet/minecraft/world/entity/HumanoidArm;)V
+public net.minecraft.client.renderer.ItemInHandRenderer renderMapHand(Lcom/mojang/blaze3d/vertex/PoseStack;Lnet/minecraft/client/renderer/SubmitNodeCollector;ILnet/minecraft/world/entity/HumanoidArm;)V
-public net.minecraft.client.renderer.ItemInHandRenderer renderPlayerArm(Lcom/mojang/blaze3d/vertex/PoseStack;Lnet/minecraft/client/renderer/MultiBufferSource;IFFLnet/minecraft/world/entity/HumanoidArm;)V
+public net.minecraft.client.renderer.ItemInHandRenderer renderPlayerArm(Lcom/mojang/blaze3d/vertex/PoseStack;Lnet/minecraft/client/renderer/SubmitNodeCollector;IFFLnet/minecraft/world/entity/HumanoidArm;)V
 
 # SpeakerInstance/SpeakerManager
 public com.mojang.blaze3d.audio.Channel pumpBuffers(I)V

projects/forge/src/main/resources/META-INF/neoforge.mods.toml

@@ -26,7 +26,7 @@ CC: Tweaked is a fork of ComputerCraft, adding programmable computers, turtles a
 [[dependencies.computercraft]]
     modId="neoforge"
     type="required"
-    versionRange="[${neoVersion},21.8)"
+    versionRange="[${neoVersion},21.11)"
     ordering="NONE"
     side="BOTH"
 

projects/forge/src/test/java/dan200/computercraft/shared/platform/ForgeContainerTransferTest.java

@@ -7,12 +7,12 @@ package dan200.computercraft.shared.platform;
 import dan200.computercraft.test.shared.WithMinecraft;
 import dan200.computercraft.test.shared.platform.ContainerTransferContract;
 import net.minecraft.world.Container;
-import net.neoforged.neoforge.items.wrapper.InvWrapper;
+import net.neoforged.neoforge.transfer.item.VanillaContainerWrapper;
 
 @WithMinecraft
 public class ForgeContainerTransferTest implements ContainerTransferContract {
     @Override
     public ContainerTransfer.Slotted wrap(Container container) {
-        return new ForgeContainerTransfer(new InvWrapper(container));
+        return new ForgeContainerTransfer(VanillaContainerWrapper.of(container));
     }
 }

projects/forge/src/test/java/dan200/computercraft/test/shared/NeoSetupHook.java

@@ -5,8 +5,11 @@
 package dan200.computercraft.test.shared;
 
 import com.google.auto.service.AutoService;
+import net.neoforged.api.distmarker.Dist;
+import net.neoforged.fml.loading.FMLLoader;
 import net.neoforged.fml.loading.LoadingModList;
 
+import java.nio.file.Path;
 import java.util.List;
 import java.util.Map;
 
@@ -17,7 +20,18 @@ import java.util.Map;
 public final class NeoSetupHook implements WithMinecraft.SetupHook {
     @Override
     public void run() {
-        // Feature flags require the loaded mod list to be available, so populate it with some empty data.
+        // Bits of Minecraft depend on the loader being present. Do some nasty things to inject it.
-        LoadingModList.of(List.of(), List.of(), List.of(), List.of(), Map.of());
+        // TODO: Switch to using NF's JUnit support instead.
+        try {
+            var ctor = FMLLoader.class.getDeclaredConstructor(ClassLoader.class, String[].class, Dist.class, boolean.class, Path.class);
+            ctor.setAccessible(true);
+            var loader = ctor.newInstance(null, new String[0], Dist.CLIENT, false, Path.of("."));
+
+            var modListField = FMLLoader.class.getDeclaredField("loadingModList");
+            modListField.setAccessible(true);
+            modListField.set(loader, LoadingModList.of(List.of(), List.of(), List.of(), List.of(), List.of(), Map.of()));
+        } catch (ReflectiveOperationException e) {
+            throw new RuntimeException(e);
+        }
     }
 }