Sanstexts

- Add EmbeddedLevel to api
- Move all context api/lib stuffs into backend
- Move context shaders into internal
- Inline Shader and TextureSource interfaces
- Move matrix bounding sphere transform into util
- Add uniforms to cull shader to allow it to work with embedded levels
- Engine has 2 instancer methods, one that accepts an EmbeddedLevel and
  one without the parameter
- Change VisualizationContext#withContext to #embed
- Remove crumbling stuff from Contexts

src/main/java/com/jozufozu/flywheel/Flywheel.java

@@ -11,6 +11,7 @@ import com.jozufozu.flywheel.api.visualization.VisualizationManager;
 import com.jozufozu.flywheel.backend.Backends;
 import com.jozufozu.flywheel.backend.ShaderIndices;
 import com.jozufozu.flywheel.backend.compile.FlwPrograms;
+import com.jozufozu.flywheel.backend.context.ContextShaders;
 import com.jozufozu.flywheel.backend.engine.uniform.Uniforms;
 import com.jozufozu.flywheel.config.BackendArgument;
 import com.jozufozu.flywheel.config.FlwCommands;
@@ -19,7 +20,6 @@ import com.jozufozu.flywheel.impl.BackendManagerImpl;
 import com.jozufozu.flywheel.impl.registry.IdRegistryImpl;
 import com.jozufozu.flywheel.impl.registry.RegistryImpl;
 import com.jozufozu.flywheel.impl.visualization.VisualizationEventHandler;
-import com.jozufozu.flywheel.lib.context.ContextShaders;
 import com.jozufozu.flywheel.lib.instance.InstanceTypes;
 import com.jozufozu.flywheel.lib.material.CutoutShaders;
 import com.jozufozu.flywheel.lib.material.FogShaders;

src/main/java/com/jozufozu/flywheel/api/backend/Engine.java

@@ -3,7 +3,6 @@ package com.jozufozu.flywheel.api.backend;
 import java.util.List;
 
 import com.jozufozu.flywheel.api.BackendImplemented;
-import com.jozufozu.flywheel.api.context.Context;
 import com.jozufozu.flywheel.api.event.RenderContext;
 import com.jozufozu.flywheel.api.event.RenderStage;
 import com.jozufozu.flywheel.api.instance.Instance;
@@ -13,6 +12,7 @@ import com.jozufozu.flywheel.api.instance.InstancerProvider;
 import com.jozufozu.flywheel.api.model.Model;
 import com.jozufozu.flywheel.api.task.Plan;
 import com.jozufozu.flywheel.api.task.TaskExecutor;
+import com.jozufozu.flywheel.api.visualization.EmbeddedLevel;
 
 import net.minecraft.client.Camera;
 import net.minecraft.core.BlockPos;
@@ -32,7 +32,9 @@ public interface Engine {
 	 * @return An instancer for the given instance type, model, and render stage.
 	 * @see InstancerProvider
 	 */
-	<I extends Instance> Instancer<I> instancer(InstanceType<I> type, Context context, Model model, RenderStage stage);
+	<I extends Instance> Instancer<I> instancer(InstanceType<I> type, Model model, RenderStage stage);
+
+	<I extends Instance> Instancer<I> instancer(EmbeddedLevel world, InstanceType<I> type, Model model, RenderStage stage);
 
 	/**
 	 * Create a plan that will be executed every frame.

src/main/java/com/jozufozu/flywheel/api/context/Shader.java

@@ -1,20 +0,0 @@
-package com.jozufozu.flywheel.api.context;
-
-import org.joml.Matrix4fc;
-
-import com.jozufozu.flywheel.api.BackendImplemented;
-
-@BackendImplemented
-public interface Shader {
-	void setTexture(String glslName, Texture texture);
-
-	void setFloat(String glslName, float value);
-
-	void setVec2(String glslName, float x, float y);
-
-	void setVec3(String glslName, float x, float y, float z);
-
-	void setVec4(String glslName, float x, float y, float z, float w);
-
-	void setMat4(String glslName, Matrix4fc matrix);
-}

src/main/java/com/jozufozu/flywheel/api/context/TextureSource.java

@@ -1,32 +0,0 @@
-package com.jozufozu.flywheel.api.context;
-
-import com.jozufozu.flywheel.api.BackendImplemented;
-
-import net.minecraft.resources.ResourceLocation;
-
-@BackendImplemented
-public interface TextureSource {
-	/**
-	 * Get a built-in texture by its resource location.
-	 *
-	 * @param texture The texture's resource location.
-	 * @return The texture.
-	 */
-	Texture byName(ResourceLocation texture);
-
-	/**
-	 * Get the overlay texture.
-	 *
-	 * @return The overlay texture.
-	 */
-	Texture overlay();
-
-	/**
-	 * Get the light texture.
-	 *
-	 * @return The light texture.
-	 */
-	Texture light();
-
-	// TODO: Allow creating dynamic textures.
-}

src/main/java/com/jozufozu/flywheel/api/visualization/EmbeddedLevel.java

@@ -0,0 +1,11 @@
+package com.jozufozu.flywheel.api.visualization;
+
+import com.mojang.blaze3d.vertex.PoseStack;
+
+import net.minecraft.world.phys.AABB;
+
+public interface EmbeddedLevel {
+	void transform(PoseStack stack);
+
+	AABB boundingBox();
+}

src/main/java/com/jozufozu/flywheel/api/visualization/VisualizationContext.java

@@ -2,8 +2,8 @@ package com.jozufozu.flywheel.api.visualization;
 
 import org.jetbrains.annotations.ApiStatus;
 
-import com.jozufozu.flywheel.api.context.Context;
 import com.jozufozu.flywheel.api.instance.InstancerProvider;
+import com.jozufozu.flywheel.backend.context.Context;
 
 import net.minecraft.core.Vec3i;
 
@@ -32,5 +32,5 @@ public interface VisualizationContext {
 	 * @return A new {@link VisualizationContext} for use with child visuals.
 	 */
 	@ApiStatus.Experimental
-	VisualizationContext withContext(Context context, Vec3i renderOrigin);
+	VisualizationContext embed(EmbeddedLevel world);
 }

src/main/java/com/jozufozu/flywheel/backend/compile/FlwPrograms.java

@@ -8,12 +8,12 @@ import org.slf4j.LoggerFactory;
 
 import com.google.common.collect.ImmutableList;
 import com.jozufozu.flywheel.Flywheel;
-import com.jozufozu.flywheel.api.context.ContextShader;
 import com.jozufozu.flywheel.api.instance.InstanceType;
 import com.jozufozu.flywheel.backend.ShaderIndices;
 import com.jozufozu.flywheel.backend.compile.component.UberShaderComponent;
 import com.jozufozu.flywheel.backend.compile.core.CompilerStats;
 import com.jozufozu.flywheel.backend.compile.core.SourceLoader;
+import com.jozufozu.flywheel.backend.context.ContextShader;
 import com.jozufozu.flywheel.backend.glsl.ShaderSources;
 import com.jozufozu.flywheel.backend.glsl.SourceComponent;
 import com.jozufozu.flywheel.backend.glsl.generate.FnSignature;

src/main/java/com/jozufozu/flywheel/backend/compile/IndirectPrograms.java

@@ -7,11 +7,11 @@ import org.jetbrains.annotations.Nullable;
 
 import com.google.common.collect.ImmutableList;
 import com.jozufozu.flywheel.Flywheel;
-import com.jozufozu.flywheel.api.context.ContextShader;
 import com.jozufozu.flywheel.api.instance.InstanceType;
 import com.jozufozu.flywheel.backend.compile.component.IndirectComponent;
 import com.jozufozu.flywheel.backend.compile.core.CompilationHarness;
 import com.jozufozu.flywheel.backend.compile.core.Compile;
+import com.jozufozu.flywheel.backend.context.ContextShader;
 import com.jozufozu.flywheel.backend.gl.GlCompat;
 import com.jozufozu.flywheel.backend.gl.shader.GlProgram;
 import com.jozufozu.flywheel.backend.gl.shader.ShaderType;

src/main/java/com/jozufozu/flywheel/backend/compile/InstancingPrograms.java

@@ -6,8 +6,8 @@ import java.util.Map;
 import org.jetbrains.annotations.Nullable;
 
 import com.google.common.collect.ImmutableList;
-import com.jozufozu.flywheel.api.context.ContextShader;
 import com.jozufozu.flywheel.api.instance.InstanceType;
+import com.jozufozu.flywheel.backend.context.ContextShader;
 import com.jozufozu.flywheel.backend.gl.shader.GlProgram;
 import com.jozufozu.flywheel.backend.glsl.ShaderSources;
 import com.jozufozu.flywheel.backend.glsl.SourceComponent;

src/main/java/com/jozufozu/flywheel/backend/compile/PipelineProgramKey.java

@@ -1,7 +1,7 @@
 package com.jozufozu.flywheel.backend.compile;
 
-import com.jozufozu.flywheel.api.context.ContextShader;
 import com.jozufozu.flywheel.api.instance.InstanceType;
+import com.jozufozu.flywheel.backend.context.ContextShader;
 
 /**
  * Represents the entire context of a program's usage.

src/main/java/com/jozufozu/flywheel/backend/context/Context.java

@@ -1,6 +1,8 @@
-package com.jozufozu.flywheel.api.context;
+package com.jozufozu.flywheel.backend.context;
 
 import com.jozufozu.flywheel.api.material.Material;
+import com.jozufozu.flywheel.backend.engine.textures.TextureSource;
+import com.jozufozu.flywheel.backend.gl.shader.GlProgram;
 
 public interface Context {
 	ContextShader contextShader();
@@ -12,5 +14,5 @@ public interface Context {
 	 * @param shader   The shader to prepare.
 	 * @param textureSource Source of the textures to use.
 	 */
-	void prepare(Material material, Shader shader, TextureSource textureSource);
+	void prepare(Material material, GlProgram shader, TextureSource textureSource);
 }

src/main/java/com/jozufozu/flywheel/backend/context/ContextShader.java

@@ -1,4 +1,4 @@
-package com.jozufozu.flywheel.api.context;
+package com.jozufozu.flywheel.backend.context;
 
 import com.jozufozu.flywheel.api.internal.InternalFlywheelApi;
 import com.jozufozu.flywheel.api.registry.Registry;

src/main/java/com/jozufozu/flywheel/backend/context/ContextShaders.java

@@ -0,0 +1,18 @@
+package com.jozufozu.flywheel.backend.context;
+
+import org.jetbrains.annotations.ApiStatus;
+
+import com.jozufozu.flywheel.Flywheel;
+
+public class ContextShaders {
+	public static final SimpleContextShader DEFAULT = ContextShader.REGISTRY.registerAndGet(new SimpleContextShader(Flywheel.rl("internal/context/default.vert"), Flywheel.rl("internal/context/default.frag")));
+	public static final SimpleContextShader CRUMBLING = ContextShader.REGISTRY.registerAndGet(new SimpleContextShader(Flywheel.rl("internal/context/crumbling.vert"), Flywheel.rl("internal/context/crumbling.frag")));
+	public static final SimpleContextShader EMBEDDED = ContextShader.REGISTRY.registerAndGet(new SimpleContextShader(Flywheel.rl("internal/context/embedded.vert"), Flywheel.rl("internal/context/embedded.frag")));
+
+	private ContextShaders() {
+	}
+
+	@ApiStatus.Internal
+	public static void init() {
+	}
+}

src/main/java/com/jozufozu/flywheel/backend/context/Contexts.java

@@ -0,0 +1,9 @@
+package com.jozufozu.flywheel.backend.context;
+
+public final class Contexts {
+	public static final Context DEFAULT = SimpleContext.builder(ContextShaders.DEFAULT)
+			.build();
+
+	private Contexts() {
+	}
+}

src/main/java/com/jozufozu/flywheel/backend/context/EmbeddedContext.java

@@ -0,0 +1,33 @@
+package com.jozufozu.flywheel.backend.context;
+
+import com.jozufozu.flywheel.api.material.Material;
+import com.jozufozu.flywheel.api.visualization.EmbeddedLevel;
+import com.jozufozu.flywheel.backend.engine.textures.TextureSource;
+import com.jozufozu.flywheel.backend.gl.shader.GlProgram;
+import com.mojang.blaze3d.vertex.PoseStack;
+
+public class EmbeddedContext implements Context {
+	private final EmbeddedLevel world;
+
+	public EmbeddedContext(EmbeddedLevel world) {
+		this.world = world;
+	}
+
+	@Override
+	public ContextShader contextShader() {
+		return ContextShaders.EMBEDDED;
+	}
+
+	@Override
+	public void prepare(Material material, GlProgram shader, TextureSource textureSource) {
+		var stack = new PoseStack();
+		world.transform(stack);
+
+		//		shader.setVec3("create_oneOverLightBoxSize");
+		//		shader.setVec3("create_lightVolumeMin");
+		shader.setMat4("_flw_model", stack.last()
+				.pose());
+		shader.setMat3("_flw_normal", stack.last()
+				.normal());
+	}
+}

src/main/java/com/jozufozu/flywheel/backend/context/SimpleContext.java

@@ -1,12 +1,10 @@
-package com.jozufozu.flywheel.lib.context;
+package com.jozufozu.flywheel.backend.context;
 
 import org.jetbrains.annotations.Nullable;
 
-import com.jozufozu.flywheel.api.context.Context;
-import com.jozufozu.flywheel.api.context.ContextShader;
-import com.jozufozu.flywheel.api.context.Shader;
-import com.jozufozu.flywheel.api.context.TextureSource;
 import com.jozufozu.flywheel.api.material.Material;
+import com.jozufozu.flywheel.backend.engine.textures.TextureSource;
+import com.jozufozu.flywheel.backend.gl.shader.GlProgram;
 
 public class SimpleContext implements Context {
 	private final ContextShader contextShader;
@@ -27,13 +25,13 @@ public class SimpleContext implements Context {
 	}
 
 	@Override
-	public void prepare(Material material, Shader shader, TextureSource textureSource) {
+	public void prepare(Material material, GlProgram shader, TextureSource textureSource) {
 		preparation.prepare(material, shader, textureSource);
 	}
 
 	@FunctionalInterface
 	public interface Preparation {
-		void prepare(Material material, Shader shader, TextureSource textureSource);
+		void prepare(Material material, GlProgram shader, TextureSource textureSource);
 	}
 
 	public static class Builder {

src/main/java/com/jozufozu/flywheel/backend/context/SimpleContextShader.java

@@ -1,6 +1,4 @@
-package com.jozufozu.flywheel.lib.context;
+package com.jozufozu.flywheel.backend.context;
-
-import com.jozufozu.flywheel.api.context.ContextShader;
 
 import net.minecraft.resources.ResourceLocation;
 

src/main/java/com/jozufozu/flywheel/backend/context/Texture.java

@@ -1,4 +1,4 @@
-package com.jozufozu.flywheel.api.context;
+package com.jozufozu.flywheel.backend.context;
 
 import com.jozufozu.flywheel.api.BackendImplemented;
 

src/main/java/com/jozufozu/flywheel/backend/engine/AbstractEngine.java

@@ -1,12 +1,14 @@
 package com.jozufozu.flywheel.backend.engine;
 
 import com.jozufozu.flywheel.api.backend.Engine;
-import com.jozufozu.flywheel.api.context.Context;
 import com.jozufozu.flywheel.api.event.RenderStage;
 import com.jozufozu.flywheel.api.instance.Instance;
 import com.jozufozu.flywheel.api.instance.InstanceType;
 import com.jozufozu.flywheel.api.instance.Instancer;
 import com.jozufozu.flywheel.api.model.Model;
+import com.jozufozu.flywheel.api.visualization.EmbeddedLevel;
+import com.jozufozu.flywheel.backend.context.Contexts;
+import com.jozufozu.flywheel.backend.context.EmbeddedContext;
 
 import net.minecraft.client.Camera;
 import net.minecraft.core.BlockPos;
@@ -22,8 +24,13 @@ public abstract class AbstractEngine implements Engine {
 	}
 
 	@Override
-	public <I extends Instance> Instancer<I> instancer(InstanceType<I> type, Context context, Model model, RenderStage stage) {
+	public <I extends Instance> Instancer<I> instancer(InstanceType<I> type, Model model, RenderStage stage) {
-		return getStorage().getInstancer(type, context, model, stage);
+		return getStorage().getInstancer(type, Contexts.DEFAULT, model, stage);
+	}
+
+	@Override
+	public <I extends Instance> Instancer<I> instancer(EmbeddedLevel world, InstanceType<I> type, Model model, RenderStage stage) {
+		return getStorage().getInstancer(type, new EmbeddedContext(world), model, stage);
 	}
 
 	@Override

src/main/java/com/jozufozu/flywheel/backend/engine/AbstractInstancer.java

@@ -2,10 +2,10 @@ package com.jozufozu.flywheel.backend.engine;
 
 import java.util.ArrayList;
 
-import com.jozufozu.flywheel.api.context.Context;
 import com.jozufozu.flywheel.api.instance.Instance;
 import com.jozufozu.flywheel.api.instance.InstanceType;
 import com.jozufozu.flywheel.api.instance.Instancer;
+import com.jozufozu.flywheel.backend.context.Context;
 import com.jozufozu.flywheel.lib.util.AtomicBitset;
 
 public abstract class AbstractInstancer<I extends Instance> implements Instancer<I> {

src/main/java/com/jozufozu/flywheel/backend/engine/InstancerKey.java

@@ -1,10 +1,10 @@
 package com.jozufozu.flywheel.backend.engine;
 
-import com.jozufozu.flywheel.api.context.Context;
 import com.jozufozu.flywheel.api.event.RenderStage;
 import com.jozufozu.flywheel.api.instance.Instance;
 import com.jozufozu.flywheel.api.instance.InstanceType;
 import com.jozufozu.flywheel.api.model.Model;
+import com.jozufozu.flywheel.backend.context.Context;
 
 public record InstancerKey<I extends Instance>(InstanceType<I> type, Context context, Model model, RenderStage stage) {
 }

src/main/java/com/jozufozu/flywheel/backend/engine/InstancerStorage.java

@@ -6,12 +6,12 @@ import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
 import com.jozufozu.flywheel.Flywheel;
-import com.jozufozu.flywheel.api.context.Context;
 import com.jozufozu.flywheel.api.event.RenderStage;
 import com.jozufozu.flywheel.api.instance.Instance;
 import com.jozufozu.flywheel.api.instance.InstanceType;
 import com.jozufozu.flywheel.api.instance.Instancer;
 import com.jozufozu.flywheel.api.model.Model;
+import com.jozufozu.flywheel.backend.context.Context;
 
 public abstract class InstancerStorage<N extends AbstractInstancer<?>> {
 	/**

src/main/java/com/jozufozu/flywheel/backend/engine/indirect/IndirectCullingGroup.java

@@ -16,22 +16,22 @@ import java.util.EnumMap;
 import java.util.List;
 import java.util.Map;
 
-import com.jozufozu.flywheel.api.context.Context;
 import com.jozufozu.flywheel.api.event.RenderStage;
 import com.jozufozu.flywheel.api.instance.Instance;
 import com.jozufozu.flywheel.api.instance.InstanceType;
 import com.jozufozu.flywheel.api.material.Material;
 import com.jozufozu.flywheel.api.model.Model;
 import com.jozufozu.flywheel.backend.compile.IndirectPrograms;
+import com.jozufozu.flywheel.backend.context.Context;
+import com.jozufozu.flywheel.backend.context.SimpleContextShader;
 import com.jozufozu.flywheel.backend.engine.MaterialRenderState;
 import com.jozufozu.flywheel.backend.engine.MeshPool;
 import com.jozufozu.flywheel.backend.engine.textures.TextureBinder;
-import com.jozufozu.flywheel.backend.engine.textures.TextureSourceImpl;
+import com.jozufozu.flywheel.backend.engine.textures.TextureSource;
 import com.jozufozu.flywheel.backend.engine.uniform.Uniforms;
 import com.jozufozu.flywheel.backend.gl.Driver;
 import com.jozufozu.flywheel.backend.gl.GlCompat;
 import com.jozufozu.flywheel.backend.gl.shader.GlProgram;
-import com.jozufozu.flywheel.lib.context.SimpleContextShader;
 
 public class IndirectCullingGroup<I extends Instance> {
 	private static final Comparator<IndirectDraw> DRAW_COMPARATOR = Comparator.comparing(IndirectDraw::stage)
@@ -191,7 +191,7 @@ public class IndirectCullingGroup<I extends Instance> {
 		needsDrawSort = true;
 	}
 
-	public void submit(RenderStage stage, TextureSourceImpl textures) {
+	public void submit(RenderStage stage, TextureSource textures) {
 		if (nothingToDo(stage)) {
 			return;
 		}

src/main/java/com/jozufozu/flywheel/backend/engine/indirect/IndirectDrawManager.java

@@ -12,11 +12,12 @@ import java.util.List;
 import java.util.Map;
 
 import com.jozufozu.flywheel.api.backend.Engine;
-import com.jozufozu.flywheel.api.context.Context;
 import com.jozufozu.flywheel.api.event.RenderStage;
 import com.jozufozu.flywheel.api.instance.Instance;
 import com.jozufozu.flywheel.api.instance.InstanceType;
 import com.jozufozu.flywheel.backend.compile.IndirectPrograms;
+import com.jozufozu.flywheel.backend.context.Context;
+import com.jozufozu.flywheel.backend.context.ContextShaders;
 import com.jozufozu.flywheel.backend.engine.CommonCrumbling;
 import com.jozufozu.flywheel.backend.engine.InstanceHandleImpl;
 import com.jozufozu.flywheel.backend.engine.InstancerKey;
@@ -24,14 +25,12 @@ import com.jozufozu.flywheel.backend.engine.InstancerStorage;
 import com.jozufozu.flywheel.backend.engine.MaterialRenderState;
 import com.jozufozu.flywheel.backend.engine.MeshPool;
 import com.jozufozu.flywheel.backend.engine.textures.TextureBinder;
-import com.jozufozu.flywheel.backend.engine.textures.TextureSourceImpl;
+import com.jozufozu.flywheel.backend.engine.textures.TextureSource;
 import com.jozufozu.flywheel.backend.engine.uniform.Uniforms;
 import com.jozufozu.flywheel.backend.gl.GlStateTracker;
 import com.jozufozu.flywheel.backend.gl.array.GlVertexArray;
 import com.jozufozu.flywheel.backend.gl.buffer.GlBuffer;
 import com.jozufozu.flywheel.backend.gl.buffer.GlBufferType;
-import com.jozufozu.flywheel.lib.context.ContextShaders;
-import com.jozufozu.flywheel.lib.context.Contexts;
 import com.jozufozu.flywheel.lib.material.SimpleMaterial;
 import com.jozufozu.flywheel.lib.memory.MemoryBlock;
 import com.jozufozu.flywheel.lib.util.Pair;
@@ -45,7 +44,7 @@ public class IndirectDrawManager extends InstancerStorage<IndirectInstancer<?>>
 	private final StagingBuffer stagingBuffer;
 	private final MeshPool meshPool;
 	private final GlVertexArray vertexArray;
-	private final TextureSourceImpl textures = new TextureSourceImpl();
+	private final TextureSource textures = new TextureSource();
 	private final Map<GroupKey<?>, IndirectCullingGroup<?>> cullingGroups = new HashMap<>();
 	private final GlBuffer crumblingDrawBuffer = new GlBuffer();
 
@@ -169,6 +168,8 @@ public class IndirectDrawManager extends InstancerStorage<IndirectInstancer<?>>
 						.bindWithContextShader(ContextShaders.CRUMBLING);
 
 				for (var progressEntry : byProgress.int2ObjectEntrySet()) {
+					program.setTexture("crumblingTex", textures.byName(ModelBakery.BREAKING_LOCATIONS.get(progressEntry.getIntKey())));
+
 					for (var instanceHandlePair : progressEntry.getValue()) {
 						IndirectInstancer<?> instancer = instanceHandlePair.first();
 						int instanceIndex = instanceHandlePair.second().index;
@@ -177,9 +178,7 @@ public class IndirectDrawManager extends InstancerStorage<IndirectInstancer<?>>
 
 							// Transform the material to be suited for crumbling.
 							CommonCrumbling.applyCrumblingProperties(crumblingMaterial, draw.material());
-							var context = Contexts.CRUMBLING.get(progressEntry.getIntKey());
 
-							context.prepare(crumblingMaterial, program, textures);
 							MaterialRenderState.setup(crumblingMaterial);
 
 							// Upload the draw command.
@@ -188,12 +187,12 @@ public class IndirectDrawManager extends InstancerStorage<IndirectInstancer<?>>
 
 							// Submit! Everything is already bound by here.
 							glDrawElementsIndirect(GL_TRIANGLES, GL_UNSIGNED_INT, 0);
+						}
+					}
 
 					TextureBinder.resetTextureBindings();
 				}
 			}
-				}
-			}
 
 			MaterialRenderState.reset();
 			TextureBinder.resetLightAndOverlay();

src/main/java/com/jozufozu/flywheel/backend/engine/indirect/IndirectInstancer.java

@@ -6,11 +6,11 @@ import java.util.List;
 import org.joml.Vector4fc;
 import org.lwjgl.system.MemoryUtil;
 
-import com.jozufozu.flywheel.api.context.Context;
 import com.jozufozu.flywheel.api.instance.Instance;
 import com.jozufozu.flywheel.api.instance.InstanceType;
 import com.jozufozu.flywheel.api.instance.InstanceWriter;
 import com.jozufozu.flywheel.api.model.Model;
+import com.jozufozu.flywheel.backend.context.Context;
 import com.jozufozu.flywheel.backend.engine.AbstractInstancer;
 
 public class IndirectInstancer<I extends Instance> extends AbstractInstancer<I> {

src/main/java/com/jozufozu/flywheel/backend/engine/instancing/InstancedDrawManager.java

@@ -20,6 +20,7 @@ import com.jozufozu.flywheel.api.instance.Instance;
 import com.jozufozu.flywheel.api.material.Material;
 import com.jozufozu.flywheel.backend.ShaderIndices;
 import com.jozufozu.flywheel.backend.compile.InstancingPrograms;
+import com.jozufozu.flywheel.backend.context.ContextShaders;
 import com.jozufozu.flywheel.backend.engine.CommonCrumbling;
 import com.jozufozu.flywheel.backend.engine.InstanceHandleImpl;
 import com.jozufozu.flywheel.backend.engine.InstancerKey;
@@ -28,15 +29,13 @@ import com.jozufozu.flywheel.backend.engine.MaterialEncoder;
 import com.jozufozu.flywheel.backend.engine.MaterialRenderState;
 import com.jozufozu.flywheel.backend.engine.MeshPool;
 import com.jozufozu.flywheel.backend.engine.textures.TextureBinder;
-import com.jozufozu.flywheel.backend.engine.textures.TextureSourceImpl;
+import com.jozufozu.flywheel.backend.engine.textures.TextureSource;
 import com.jozufozu.flywheel.backend.engine.uniform.Uniforms;
 import com.jozufozu.flywheel.backend.gl.GlStateTracker;
 import com.jozufozu.flywheel.backend.gl.GlTextureUnit;
 import com.jozufozu.flywheel.backend.gl.TextureBuffer;
 import com.jozufozu.flywheel.backend.gl.array.GlVertexArray;
 import com.jozufozu.flywheel.backend.gl.shader.GlProgram;
-import com.jozufozu.flywheel.lib.context.ContextShaders;
-import com.jozufozu.flywheel.lib.context.Contexts;
 import com.jozufozu.flywheel.lib.material.SimpleMaterial;
 
 import it.unimi.dsi.fastutil.ints.Int2ObjectArrayMap;
@@ -54,7 +53,7 @@ public class InstancedDrawManager extends InstancerStorage<InstancedInstancer<?>
 	 */
 	private final MeshPool meshPool;
 	private final GlVertexArray vao;
-	private final TextureSourceImpl textures;
+	private final TextureSource textures;
 	private final TextureBuffer instanceTexture;
 
 	public InstancedDrawManager(InstancingPrograms programs) {
@@ -63,7 +62,7 @@ public class InstancedDrawManager extends InstancerStorage<InstancedInstancer<?>
 
 		meshPool = new MeshPool();
 		vao = GlVertexArray.create();
-		textures = new TextureSourceImpl();
+		textures = new TextureSource();
 		instanceTexture = new TextureBuffer();
 
 		meshPool.bind(vao);
@@ -223,8 +222,7 @@ public class InstancedDrawManager extends InstancerStorage<InstancedInstancer<?>
 						continue;
 					}
 
-					var context = Contexts.CRUMBLING.get(progressEntry.getIntKey());
+					program.setTexture("crumblingTex", textures.byName(ModelBakery.BREAKING_LOCATIONS.get(progressEntry.getIntKey())));
-					context.prepare(crumblingMaterial, program, textures);
 
 					GlTextureUnit.T3.makeActive();
 					program.setSamplerBinding("_flw_instances", 3);

src/main/java/com/jozufozu/flywheel/backend/engine/instancing/InstancedInstancer.java

@@ -5,10 +5,10 @@ import java.util.List;
 
 import org.jetbrains.annotations.Nullable;
 
-import com.jozufozu.flywheel.api.context.Context;
 import com.jozufozu.flywheel.api.instance.Instance;
 import com.jozufozu.flywheel.api.instance.InstanceType;
 import com.jozufozu.flywheel.api.instance.InstanceWriter;
+import com.jozufozu.flywheel.backend.context.Context;
 import com.jozufozu.flywheel.backend.engine.AbstractInstancer;
 import com.jozufozu.flywheel.backend.gl.TextureBuffer;
 import com.jozufozu.flywheel.backend.gl.buffer.GlBuffer;

src/main/java/com/jozufozu/flywheel/backend/engine/instancing/ShaderState.java

@@ -1,8 +1,8 @@
 package com.jozufozu.flywheel.backend.engine.instancing;
 
-import com.jozufozu.flywheel.api.context.Context;
 import com.jozufozu.flywheel.api.instance.InstanceType;
 import com.jozufozu.flywheel.api.material.Material;
+import com.jozufozu.flywheel.backend.context.Context;
 
 public record ShaderState(Material material, InstanceType<?> instanceType, Context context) {
 }

src/main/java/com/jozufozu/flywheel/backend/engine/textures/IdentifiedTexture.java

@@ -1,6 +1,6 @@
 package com.jozufozu.flywheel.backend.engine.textures;
 
-import com.jozufozu.flywheel.api.context.Texture;
+import com.jozufozu.flywheel.backend.context.Texture;
 
 /**
  * Internal base interface that {@link com.jozufozu.flywheel.backend.gl.shader.GlProgram GlProgram} expects.

src/main/java/com/jozufozu/flywheel/backend/engine/textures/TextureSource.java

@@ -3,8 +3,7 @@ package com.jozufozu.flywheel.backend.engine.textures;
 import java.util.HashMap;
 import java.util.Map;
 
-import com.jozufozu.flywheel.api.context.Texture;
+import com.jozufozu.flywheel.backend.context.Texture;
-import com.jozufozu.flywheel.api.context.TextureSource;
 import com.jozufozu.flywheel.backend.mixin.LightTextureAccessor;
 import com.jozufozu.flywheel.backend.mixin.OverlayTextureAccessor;
 
@@ -12,13 +11,13 @@ import net.minecraft.client.Minecraft;
 import net.minecraft.client.renderer.texture.AbstractTexture;
 import net.minecraft.resources.ResourceLocation;
 
-public class TextureSourceImpl implements TextureSource {
+public class TextureSource {
 
 	private final DirectTexture lightTexture;
 	private final DirectTexture overlayTexture;
 	private final Map<ResourceLocation, WrappedTexture> wrappers = new HashMap<>();
 
-	public TextureSourceImpl() {
+	public TextureSource() {
 		var gameRenderer = Minecraft.getInstance().gameRenderer;
 
 		this.lightTexture = new DirectTexture(((LightTextureAccessor) gameRenderer.lightTexture()).flywheel$texture()
@@ -28,19 +27,32 @@ public class TextureSourceImpl implements TextureSource {
 	}
 
 
-	@Override
+	/**
+	 * Get a built-in texture by its resource location.
+	 *
+	 * @param texture The texture's resource location.
+	 * @return The texture.
+	 */
 	public Texture byName(ResourceLocation texture) {
 		return wrappers.computeIfAbsent(texture, key -> new WrappedTexture(Minecraft.getInstance()
 				.getTextureManager()
 				.getTexture(key)));
 	}
 
-	@Override
+	/**
+	 * Get the overlay texture.
+	 *
+	 * @return The overlay texture.
+	 */
 	public Texture overlay() {
 		return overlayTexture;
 	}
 
-	@Override
+	/**
+	 * Get the light texture.
+	 *
+	 * @return The light texture.
+	 */
 	public Texture light() {
 		return lightTexture;
 	}

src/main/java/com/jozufozu/flywheel/backend/gl/shader/GlProgram.java

@@ -8,16 +8,17 @@ import static org.lwjgl.opengl.GL20.glUniform1i;
 import static org.lwjgl.opengl.GL20.glUniform2f;
 import static org.lwjgl.opengl.GL20.glUniform3f;
 import static org.lwjgl.opengl.GL20.glUniform4f;
+import static org.lwjgl.opengl.GL20.glUniformMatrix3fv;
 import static org.lwjgl.opengl.GL20.glUniformMatrix4fv;
 import static org.lwjgl.opengl.GL31.GL_INVALID_INDEX;
 import static org.lwjgl.opengl.GL31.glGetUniformBlockIndex;
 import static org.lwjgl.opengl.GL31.glUniformBlockBinding;
 
+import org.joml.Matrix3fc;
 import org.joml.Matrix4fc;
 import org.slf4j.Logger;
 
-import com.jozufozu.flywheel.api.context.Shader;
+import com.jozufozu.flywheel.backend.context.Texture;
-import com.jozufozu.flywheel.api.context.Texture;
 import com.jozufozu.flywheel.backend.engine.textures.IdentifiedTexture;
 import com.jozufozu.flywheel.backend.engine.textures.TextureBinder;
 import com.jozufozu.flywheel.backend.gl.GlObject;
@@ -27,7 +28,7 @@ import com.mojang.logging.LogUtils;
 import it.unimi.dsi.fastutil.objects.Object2IntMap;
 import it.unimi.dsi.fastutil.objects.Object2IntOpenHashMap;
 
-public class GlProgram extends GlObject implements Shader {
+public class GlProgram extends GlObject {
 	private static final Logger LOGGER = LogUtils.getLogger();
 
 	private final Object2IntMap<String> uniformLocationCache = new Object2IntOpenHashMap<>();
@@ -44,10 +45,7 @@ public class GlProgram extends GlObject implements Shader {
 		ProgramManager.glUseProgram(0);
 	}
 
-	@Override
 	public void setTexture(String glslName, Texture texture) {
-		throwIfReserved(glslName);
-
 		if (!(texture instanceof IdentifiedTexture identified)) {
 			return;
 		}
@@ -64,10 +62,7 @@ public class GlProgram extends GlObject implements Shader {
 		glUniform1i(uniform, binding);
 	}
 
-	@Override
 	public void setFloat(String glslName, float value) {
-		throwIfReserved(glslName);
-
 		int uniform = getUniformLocation(glslName);
 
 		if (uniform < 0) {
@@ -77,10 +72,7 @@ public class GlProgram extends GlObject implements Shader {
 		glUniform1f(uniform, value);
 	}
 
-	@Override
 	public void setVec2(String glslName, float x, float y) {
-		throwIfReserved(glslName);
-
 		int uniform = getUniformLocation(glslName);
 
 		if (uniform < 0) {
@@ -90,10 +82,7 @@ public class GlProgram extends GlObject implements Shader {
 		glUniform2f(uniform, x, y);
 	}
 
-	@Override
 	public void setVec3(String glslName, float x, float y, float z) {
-		throwIfReserved(glslName);
-
 		int uniform = getUniformLocation(glslName);
 
 		if (uniform < 0) {
@@ -103,10 +92,7 @@ public class GlProgram extends GlObject implements Shader {
 		glUniform3f(uniform, x, y, z);
 	}
 
-	@Override
 	public void setVec4(String glslName, float x, float y, float z, float w) {
-		throwIfReserved(glslName);
-
 		int uniform = getUniformLocation(glslName);
 
 		if (uniform < 0) {
@@ -116,10 +102,7 @@ public class GlProgram extends GlObject implements Shader {
 		glUniform4f(uniform, x, y, z, w);
 	}
 
-	@Override
 	public void setMat4(String glslName, Matrix4fc matrix) {
-		throwIfReserved(glslName);
-
 		int uniform = getUniformLocation(glslName);
 
 		if (uniform < 0) {
@@ -129,6 +112,16 @@ public class GlProgram extends GlObject implements Shader {
 		glUniformMatrix4fv(uniform, false, matrix.get(new float[16]));
 	}
 
+	public void setMat3(String glslName, Matrix3fc matrix) {
+		int uniform = getUniformLocation(glslName);
+
+		if (uniform < 0) {
+			return;
+		}
+
+		glUniformMatrix3fv(uniform, false, matrix.get(new float[9]));
+	}
+
 	/**
 	 * Retrieves the index of the uniform with the given name.
 	 *
@@ -179,18 +172,4 @@ public class GlProgram extends GlObject implements Shader {
 	protected void deleteInternal(int handle) {
 		glDeleteProgram(handle);
 	}
-
-	public static void throwIfReserved(String glslName) {
-		if (glslName.startsWith("flw_")) {
-			throw new IllegalArgumentException("Uniform names starting with flw_are reserved");
-		}
-
-		if (glslName.startsWith("_flw_")) {
-			throw new IllegalArgumentException("Uniform names starting with _flw_ are reserved for internal use");
-		}
-
-		if (glslName.startsWith("gl_")) {
-			throw new IllegalArgumentException("Uniform names cannot start with gl_");
-		}
-	}
 }

src/main/java/com/jozufozu/flywheel/impl/visualization/InstancerProviderImpl.java

@@ -3,25 +3,63 @@ package com.jozufozu.flywheel.impl.visualization;
 import java.util.function.Supplier;
 
 import com.jozufozu.flywheel.api.backend.Engine;
-import com.jozufozu.flywheel.api.context.Context;
 import com.jozufozu.flywheel.api.event.RenderStage;
 import com.jozufozu.flywheel.api.instance.Instance;
 import com.jozufozu.flywheel.api.instance.InstanceType;
 import com.jozufozu.flywheel.api.instance.Instancer;
 import com.jozufozu.flywheel.api.instance.InstancerProvider;
 import com.jozufozu.flywheel.api.model.Model;
+import com.jozufozu.flywheel.api.visualization.EmbeddedLevel;
 import com.jozufozu.flywheel.api.visualization.VisualizationContext;
 
-public record InstancerProviderImpl(Engine engine,
+public class InstancerProviderImpl implements InstancerProvider, Supplier<VisualizationContext> {
-									Context context,
+	protected final Engine engine;
-									RenderStage renderStage) implements InstancerProvider, Supplier<VisualizationContext> {
+	protected final RenderStage renderStage;
+
+	public InstancerProviderImpl(Engine engine, RenderStage renderStage) {
+		this.engine = engine;
+		this.renderStage = renderStage;
+	}
+
 	@Override
 	public <I extends Instance> Instancer<I> instancer(InstanceType<I> type, Model model) {
-		return engine.instancer(type, context, model, renderStage);
+		return engine.instancer(type, model, renderStage);
 	}
 
 	@Override
 	public VisualizationContext get() {
 		return new VisualizationContextImpl(this, engine.renderOrigin());
 	}
+
+	public Embedded embed(EmbeddedLevel world) {
+		return new Embedded(engine, world, renderStage);
+	}
+
+	@Override
+	public String toString() {
+		return "InstancerProviderImpl[" + "engine=" + engine + ", " + "renderStage=" + renderStage + ']';
+	}
+
+	public static final class Embedded extends InstancerProviderImpl {
+		private final EmbeddedLevel world;
+
+		public Embedded(Engine engine, EmbeddedLevel world, RenderStage renderStage) {
+			super(engine, renderStage);
+			this.world = world;
+		}
+
+		@Override
+		public <I extends Instance> Instancer<I> instancer(InstanceType<I> type, Model model) {
+			return engine.instancer(world, type, model, renderStage);
+		}
+
+		public EmbeddedLevel world() {
+			return world;
+		}
+
+		@Override
+		public String toString() {
+			return "InstancerProviderImpl.EmbeddedImpl[" + "world=" + world + ", " + "engine=" + engine + ", " + "renderStage=" + renderStage + ']';
+		}
+	}
 }

src/main/java/com/jozufozu/flywheel/impl/visualization/VisualizationContextImpl.java

@@ -1,7 +1,7 @@
 package com.jozufozu.flywheel.impl.visualization;
 
-import com.jozufozu.flywheel.api.context.Context;
 import com.jozufozu.flywheel.api.instance.InstancerProvider;
+import com.jozufozu.flywheel.api.visualization.EmbeddedLevel;
 import com.jozufozu.flywheel.api.visualization.VisualizationContext;
 
 import net.minecraft.core.Vec3i;
@@ -15,8 +15,7 @@ import net.minecraft.core.Vec3i;
  */
 public record VisualizationContextImpl(InstancerProviderImpl instancerProvider, Vec3i renderOrigin) implements VisualizationContext {
 	@Override
-	public VisualizationContext withContext(Context context, Vec3i renderOrigin) {
+	public VisualizationContext embed(EmbeddedLevel world) {
-		var provider = new InstancerProviderImpl(instancerProvider.engine(), context, instancerProvider.renderStage());
+		return new VisualizationContextImpl(instancerProvider.embed(world), renderOrigin);
-		return new VisualizationContextImpl(provider, renderOrigin);
 	}
 }

src/main/java/com/jozufozu/flywheel/impl/visualization/VisualizationManagerImpl.java

@@ -36,7 +36,6 @@ import com.jozufozu.flywheel.impl.visualization.manager.VisualManagerImpl;
 import com.jozufozu.flywheel.impl.visualization.ratelimit.BandedPrimeLimiter;
 import com.jozufozu.flywheel.impl.visualization.ratelimit.DistanceUpdateLimiterImpl;
 import com.jozufozu.flywheel.impl.visualization.ratelimit.NonLimiter;
-import com.jozufozu.flywheel.lib.context.Contexts;
 import com.jozufozu.flywheel.lib.task.Flag;
 import com.jozufozu.flywheel.lib.task.IfElsePlan;
 import com.jozufozu.flywheel.lib.task.MapContextPlan;
@@ -85,9 +84,9 @@ public class VisualizationManagerImpl implements VisualizationManager {
 				.createEngine(level);
 		taskExecutor = FlwTaskExecutor.get();
 
-		var blockEntitiesStorage = new BlockEntityStorage(new InstancerProviderImpl(engine, Contexts.DEFAULT, RenderStage.AFTER_BLOCK_ENTITIES));
+		var blockEntitiesStorage = new BlockEntityStorage(new InstancerProviderImpl(engine, RenderStage.AFTER_BLOCK_ENTITIES));
-		var entitiesStorage = new EntityStorage(new InstancerProviderImpl(engine, Contexts.DEFAULT, RenderStage.AFTER_ENTITIES));
+		var entitiesStorage = new EntityStorage(new InstancerProviderImpl(engine, RenderStage.AFTER_ENTITIES));
-		var effectsStorage = new EffectStorage(new InstancerProviderImpl(engine, Contexts.DEFAULT, RenderStage.AFTER_PARTICLES));
+		var effectsStorage = new EffectStorage(new InstancerProviderImpl(engine, RenderStage.AFTER_PARTICLES));
 
 		blockEntities = new VisualManagerImpl<>(blockEntitiesStorage);
 		entities = new VisualManagerImpl<>(entitiesStorage);

src/main/java/com/jozufozu/flywheel/lib/context/ContextShaders.java

@@ -1,18 +0,0 @@
-package com.jozufozu.flywheel.lib.context;
-
-import org.jetbrains.annotations.ApiStatus;
-
-import com.jozufozu.flywheel.Flywheel;
-import com.jozufozu.flywheel.api.context.ContextShader;
-
-public class ContextShaders {
-	public static final SimpleContextShader DEFAULT = ContextShader.REGISTRY.registerAndGet(new SimpleContextShader(Flywheel.rl("context/default.vert"), Flywheel.rl("context/default.frag")));
-	public static final SimpleContextShader CRUMBLING = ContextShader.REGISTRY.registerAndGet(new SimpleContextShader(Flywheel.rl("context/crumbling.vert"), Flywheel.rl("context/crumbling.frag")));
-
-	private ContextShaders() {
-	}
-
-	@ApiStatus.Internal
-	public static void init() {
-	}
-}

src/main/java/com/jozufozu/flywheel/lib/context/Contexts.java

@@ -1,33 +0,0 @@
-package com.jozufozu.flywheel.lib.context;
-
-import com.jozufozu.flywheel.api.context.Context;
-
-import it.unimi.dsi.fastutil.ints.Int2ObjectArrayMap;
-import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
-import it.unimi.dsi.fastutil.ints.Int2ObjectMaps;
-import net.minecraft.client.resources.model.ModelBakery;
-
-public final class Contexts {
-	public static final Context DEFAULT = SimpleContext.builder(ContextShaders.DEFAULT)
-			.build();
-
-	public static final Int2ObjectMap<Context> CRUMBLING;
-
-	static {
-		var map = new Int2ObjectArrayMap<Context>();
-
-		for (int i = 0; i < ModelBakery.BREAKING_LOCATIONS.size(); i++) {
-			var crumblingLocation = ModelBakery.BREAKING_LOCATIONS.get(i);
-			map.put(i, SimpleContext.builder(ContextShaders.CRUMBLING)
-					.preparation((material, shader, textureSource) -> {
-						shader.setTexture("crumblingTex", textureSource.byName(crumblingLocation));
-					})
-					.build());
-		}
-
-		CRUMBLING = Int2ObjectMaps.unmodifiable(map);
-	}
-
-	private Contexts() {
-	}
-}

src/main/resources/assets/flywheel/flywheel/instance/cull/transformed.glsl

@@ -1,14 +1,5 @@
+#include "flywheel:util/matrix.glsl"
+
 void flw_transformBoundingSphere(in FlwInstance i, inout vec3 center, inout float radius) {
-    mat4 pose = i.pose;
+    transformBoundingSphere(i.pose, center, radius);
-    center = (pose * vec4(center, 1.0)).xyz;
-
-    vec3 c0 = pose[0].xyz;
-    vec3 c1 = pose[1].xyz;
-    vec3 c2 = pose[2].xyz;
-
-    // Comute the squared maximum to avoid 2 unnecessary sqrts.
-    // I don't think this makes it any faster but why not /shrug
-    float scaleSqr = max(dot(c0, c0), max(dot(c1, c1), dot(c2, c2)));
-    float scale = sqrt(scaleSqr);
-    radius *= scale;
 }

src/main/resources/assets/flywheel/flywheel/internal/context/embedded.frag

@@ -0,0 +1,10 @@
+uniform sampler3D _flw_lightVolume;
+
+in vec3 _flw_lightVolumeCoord;
+
+void flw_beginFragment() {
+    flw_fragLight = max(flw_fragLight, texture(_flw_lightVolume, _flw_lightVolumeCoord).rg);
+}
+
+void flw_endFragment() {
+}

src/main/resources/assets/flywheel/flywheel/internal/context/embedded.vert

@@ -0,0 +1,16 @@
+uniform vec3 _flw_oneOverLightBoxSize;
+uniform vec3 _flw_lightVolumeMin;
+uniform mat4 _flw_model;
+uniform mat3 _flw_normal;
+
+out vec3 _flw_lightVolumeCoord;
+
+void flw_beginVertex() {
+}
+
+void flw_endVertex() {
+    _flw_lightVolumeCoord = (flw_vertexPos.xyz - _flw_lightVolumeMin) * _flw_oneOverLightBoxSize;
+
+    flw_vertexPos = _flw_model * flw_vertexPos;
+    flw_vertexNormal = _flw_normal * flw_vertexNormal;
+}

src/main/resources/assets/flywheel/flywheel/internal/indirect/cull.glsl

@@ -2,6 +2,7 @@
 #include "flywheel:internal/indirect/model_descriptor.glsl"
 #include "flywheel:internal/indirect/object.glsl"
 #include "flywheel:internal/uniforms/frame.glsl"
+#include "flywheel:util/matrix.glsl"
 
 layout(local_size_x = _FLW_SUBGROUP_SIZE) in;
 
@@ -17,6 +18,9 @@ layout(std430, binding = _FLW_MODEL_BUFFER_BINDING) restrict buffer ModelBuffer
     ModelDescriptor models[];
 };
 
+uniform mat4 _flw_embeddedModel;
+uniform bool _flw_useEmbeddedModel = false;
+
 // Disgustingly vectorized sphere frustum intersection taking advantage of ahead of time packing.
 // Only uses 6 fmas and some boolean ops.
 // See also:
@@ -41,6 +45,10 @@ bool _flw_isVisible(uint objectIndex, uint modelIndex) {
 
     flw_transformBoundingSphere(instance, center, radius);
 
+    if (_flw_useEmbeddedModel) {
+        transformBoundingSphere(_flw_embeddedModel, center, radius);
+    }
+
     return _flw_testSphere(center, radius);
 }
 

src/main/resources/assets/flywheel/flywheel/util/matrix.glsl

@@ -41,3 +41,17 @@ mat3 modelToNormal(mat4 mat) {
     m[2] = mat[2].xyz;
     return m;
 }
+
+void transformBoundingSphere(in mat4 mat, inout vec3 center, inout float radius) {
+    center = (mat * vec4(center, 1.)).xyz;
+
+    vec3 c0 = mat[0].xyz;
+    vec3 c1 = mat[1].xyz;
+    vec3 c2 = mat[2].xyz;
+
+    // Comute the squared maximum to avoid 2 unnecessary sqrts.
+    // I don't think this makes it any faster but why not /shrug
+    float scaleSqr = max(dot(c0, c0), max(dot(c1, c1), dot(c2, c2)));
+    float scale = sqrt(scaleSqr);
+    radius *= scale;
+}