Building shade

- Use builder pattern for defining shader compiler flows
  - If only java had type inference extending to builders :whywheel:
- Support glsl 330 on instancing again
  - Set uniform block binding at link time
  - Remove associated glsl builder code
  - Use explicit uint literals in material adapter switch cases
  - No need to enable GL_ARB_explicit_attrib_location

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

@@ -1,5 +1,7 @@
 package com.jozufozu.flywheel.api.context;
 
+import org.jetbrains.annotations.NotNull;
+
 import com.jozufozu.flywheel.api.registry.Registry;
 import com.jozufozu.flywheel.gl.shader.GlProgram;
 import com.jozufozu.flywheel.impl.RegistryImpl;
@@ -9,7 +11,7 @@ import net.minecraft.resources.ResourceLocation;
 public interface Context {
 	static Registry<Context> REGISTRY = RegistryImpl.create();
 
-	void onProgramLink(GlProgram program);
+	void onProgramLink(@NotNull GlProgram program);
 
 	ResourceLocation vertexShader();
 

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

@@ -13,30 +13,29 @@ import com.jozufozu.flywheel.backend.compile.core.ShaderCompiler;
 import com.jozufozu.flywheel.gl.shader.GlProgram;
 import com.jozufozu.flywheel.glsl.ShaderSources;
 
-public abstract class AbstractCompiler<K> {
-	protected final SourceLoader sourceLoader;
-	protected final ShaderCompiler shaderCompiler;
-	protected final ProgramLinker programLinker;
+public class CompilationHarness<K> {
+	private final KeyCompiler<K> compiler;
+	private final SourceLoader sourceLoader;
+	private final ShaderCompiler shaderCompiler;
+	private final ProgramLinker programLinker;
 	private final ImmutableList<K> keys;
 	private final CompilerStats stats = new CompilerStats();
 
-	public AbstractCompiler(ShaderSources sources, ImmutableList<K> keys) {
+	public CompilationHarness(ShaderSources sources, ImmutableList<K> keys, KeyCompiler<K> compiler) {
 		this.keys = keys;
 
+		this.compiler = compiler;
 		sourceLoader = new SourceLoader(sources, stats);
 		shaderCompiler = new ShaderCompiler(stats);
 		programLinker = new ProgramLinker(stats);
 	}
 
-	@Nullable
-	protected abstract GlProgram compile(K key);
-
 	@Nullable
 	public Map<K, GlProgram> compileAndReportErrors() {
 		stats.start();
 		Map<K, GlProgram> out = new HashMap<>();
 		for (var key : keys) {
-			GlProgram glProgram = compile(key);
+			GlProgram glProgram = compiler.compile(key, sourceLoader, shaderCompiler, programLinker);
 			if (out != null && glProgram != null) {
 				out.put(key, glProgram);
 			} else {
@@ -56,4 +55,8 @@ public abstract class AbstractCompiler<K> {
 	public void delete() {
 		shaderCompiler.delete();
 	}
+
+	public interface KeyCompiler<K> {
+		@Nullable GlProgram compile(K key, SourceLoader loader, ShaderCompiler shaderCompiler, ProgramLinker programLinker);
+	}
 }

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

@@ -0,0 +1,132 @@
+package com.jozufozu.flywheel.backend.compile;
+
+import java.util.ArrayList;
+import java.util.EnumMap;
+import java.util.List;
+import java.util.Map;
+import java.util.function.BiConsumer;
+import java.util.function.BiFunction;
+
+import org.jetbrains.annotations.Nullable;
+
+import com.jozufozu.flywheel.backend.compile.core.ProgramLinker;
+import com.jozufozu.flywheel.backend.compile.core.ShaderCompiler;
+import com.jozufozu.flywheel.gl.shader.GlProgram;
+import com.jozufozu.flywheel.gl.shader.GlShader;
+import com.jozufozu.flywheel.gl.shader.ShaderType;
+import com.jozufozu.flywheel.glsl.GLSLVersion;
+import com.jozufozu.flywheel.glsl.SourceComponent;
+import com.jozufozu.flywheel.util.NotNullFunction;
+
+import net.minecraft.resources.ResourceLocation;
+
+public class Compile {
+	public static <K> ShaderCompilerBuilder<K> shader(GLSLVersion glslVersion, ShaderType shaderType) {
+		return new ShaderCompilerBuilder<>(glslVersion, shaderType);
+	}
+
+	public static <K> ProgramLinkBuilder<K> program() {
+		return new ProgramLinkBuilder<>();
+	}
+
+	public static class ProgramLinkBuilder<K> implements CompilationHarness.KeyCompiler<K> {
+		private final Map<ShaderType, ShaderCompilerBuilder<K>> compilers = new EnumMap<>(ShaderType.class);
+		private BiConsumer<K, GlProgram> onLink = (k, p) -> {
+		};
+
+		public ProgramLinkBuilder<K> link(ShaderCompilerBuilder<K> compilerBuilder) {
+			if (compilers.containsKey(compilerBuilder.shaderType)) {
+				throw new IllegalArgumentException("Duplicate shader type: " + compilerBuilder.shaderType);
+			}
+			compilers.put(compilerBuilder.shaderType, compilerBuilder);
+			return this;
+		}
+
+		public ProgramLinkBuilder<K> then(BiConsumer<K, GlProgram> onLink) {
+			this.onLink = onLink;
+			return this;
+		}
+
+		@Override
+		@Nullable
+		public GlProgram compile(K key, SourceLoader loader, ShaderCompiler shaderCompiler, ProgramLinker programLinker) {
+			if (compilers.isEmpty()) {
+				throw new IllegalStateException("No shader compilers were added!");
+			}
+
+			List<GlShader> shaders = new ArrayList<>();
+
+			boolean ok = true;
+			for (ShaderCompilerBuilder<K> compiler : compilers.values()) {
+				var shader = compiler.compile(key, shaderCompiler, loader);
+				if (shader == null) {
+					ok = false;
+				}
+				shaders.add(shader);
+			}
+
+			if (!ok) {
+				return null;
+			}
+
+			var out = programLinker.link(shaders);
+
+			if (out != null) {
+				onLink.accept(key, out);
+			}
+
+			return out;
+		}
+	}
+
+	public static class ShaderCompilerBuilder<K> {
+		private final GLSLVersion glslVersion;
+		private final ShaderType shaderType;
+		private final List<BiFunction<K, SourceLoader, SourceComponent>> fetchers = new ArrayList<>();
+
+		public ShaderCompilerBuilder(GLSLVersion glslVersion, ShaderType shaderType) {
+			this.glslVersion = glslVersion;
+			this.shaderType = shaderType;
+		}
+
+		public ShaderCompilerBuilder<K> with(BiFunction<K, SourceLoader, SourceComponent> fetch) {
+			fetchers.add(fetch);
+			return this;
+		}
+
+		public ShaderCompilerBuilder<K> withComponent(SourceComponent component) {
+			return withComponent($ -> component);
+		}
+
+		public ShaderCompilerBuilder<K> withComponent(NotNullFunction<K, SourceComponent> sourceFetcher) {
+			return with((key, $) -> sourceFetcher.apply(key));
+		}
+
+		public ShaderCompilerBuilder<K> withResource(NotNullFunction<K, ResourceLocation> sourceFetcher) {
+			return with((key, loader) -> loader.find(sourceFetcher.apply(key)));
+		}
+
+		public ShaderCompilerBuilder<K> withResource(ResourceLocation resourceLocation) {
+			return withResource($ -> resourceLocation);
+		}
+
+		@Nullable
+		private GlShader compile(K key, ShaderCompiler compiler, SourceLoader loader) {
+			var components = new ArrayList<SourceComponent>();
+			boolean ok = true;
+			for (var fetcher : fetchers) {
+				SourceComponent apply = fetcher.apply(key, loader);
+				if (apply == null) {
+					ok = false;
+				}
+				components.add(apply);
+			}
+
+			if (!ok) {
+				return null;
+			}
+
+			return compiler.compile(glslVersion, shaderType, components);
+		}
+	}
+}

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

@@ -1,59 +0,0 @@
-package com.jozufozu.flywheel.backend.compile;
-
-import org.jetbrains.annotations.Nullable;
-
-import com.google.common.collect.ImmutableList;
-import com.jozufozu.flywheel.Flywheel;
-import com.jozufozu.flywheel.api.instance.InstanceType;
-import com.jozufozu.flywheel.backend.compile.component.IndirectComponent;
-import com.jozufozu.flywheel.backend.compile.component.UniformComponent;
-import com.jozufozu.flywheel.gl.shader.GlProgram;
-import com.jozufozu.flywheel.gl.shader.ShaderType;
-import com.jozufozu.flywheel.glsl.GLSLVersion;
-import com.jozufozu.flywheel.glsl.ShaderSources;
-import com.jozufozu.flywheel.glsl.SourceFile;
-
-import net.minecraft.resources.ResourceLocation;
-
-public class CullingCompiler extends AbstractCompiler<InstanceType<?>> {
-	private final UniformComponent uniformComponent;
-	private final SourceFile pipelineCompute;
-
-	public static CullingCompiler create(SourceLoader sourceLoader, ImmutableList<InstanceType<?>> keys, UniformComponent uniformComponent) {
-		var sourceFile = sourceLoader.find(Files.INDIRECT_CULL);
-
-		return new CullingCompiler(sourceLoader.sources, keys, uniformComponent, sourceFile);
-	}
-
-	private CullingCompiler(ShaderSources sources, ImmutableList<InstanceType<?>> keys, UniformComponent uniformComponent, SourceFile pipeline) {
-		super(sources, keys);
-
-		this.uniformComponent = uniformComponent;
-		this.pipelineCompute = pipeline;
-	}
-
-	@Nullable
-	@Override
-	protected GlProgram compile(InstanceType<?> key) {
-		var instanceAssembly = IndirectComponent.create(key);
-		ResourceLocation rl = key.instanceShader();
-		var instance = sourceLoader.find(rl);
-
-		if (instance == null || uniformComponent == null || pipelineCompute == null) {
-			return null;
-		}
-
-		var computeComponents = ImmutableList.of(uniformComponent, instanceAssembly, instance, pipelineCompute);
-		var compute = shaderCompiler.compile(GLSLVersion.V460, ShaderType.COMPUTE, computeComponents);
-
-		if (compute == null) {
-			return null;
-		}
-
-		return programLinker.link(compute);
-	}
-
-	private static final class Files {
-		public static final ResourceLocation INDIRECT_CULL = Flywheel.rl("internal/indirect_cull.glsl");
-	}
-}

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

@@ -31,8 +31,8 @@ public class FlwPrograms {
 		var vertexMaterialComponent = createVertexMaterialComponent(loadChecker);
 		var fragmentMaterialComponent = createFragmentMaterialComponent(loadChecker);
 
-		InstancingPrograms.reload(loadChecker, pipelineKeys, uniformComponent, vertexMaterialComponent, fragmentMaterialComponent);
-		IndirectPrograms.reload(loadChecker, pipelineKeys, uniformComponent, vertexMaterialComponent, fragmentMaterialComponent);
+		InstancingPrograms.reload(sources, pipelineKeys, uniformComponent, vertexMaterialComponent, fragmentMaterialComponent);
+		IndirectPrograms.reload(sources, pipelineKeys, uniformComponent, vertexMaterialComponent, fragmentMaterialComponent);
 
 		if (preLoadStats.errored()) {
 			Flywheel.LOGGER.error(preLoadStats.generateErrorLog());
@@ -47,7 +47,7 @@ public class FlwPrograms {
 						.returnType("bool")
 						.name("flw_discardPredicate")
 						.arg("vec4", "color")
-						.build(), GlslExpr.literal(false))
+						.build(), GlslExpr.boolLiteral(false))
 				.adapt(FnSignature.create()
 						.returnType("vec4")
 						.name("flw_fogFilter")

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

@@ -9,9 +9,15 @@ import com.jozufozu.flywheel.Flywheel;
 import com.jozufozu.flywheel.api.context.Context;
 import com.jozufozu.flywheel.api.instance.InstanceType;
 import com.jozufozu.flywheel.api.vertex.VertexType;
+import com.jozufozu.flywheel.backend.compile.component.IndirectComponent;
 import com.jozufozu.flywheel.backend.compile.component.MaterialAdapterComponent;
 import com.jozufozu.flywheel.backend.compile.component.UniformComponent;
 import com.jozufozu.flywheel.gl.shader.GlProgram;
+import com.jozufozu.flywheel.gl.shader.ShaderType;
+import com.jozufozu.flywheel.glsl.GLSLVersion;
+import com.jozufozu.flywheel.glsl.ShaderSources;
+
+import net.minecraft.resources.ResourceLocation;
 
 public class IndirectPrograms {
 	public static IndirectPrograms instance;
@@ -23,10 +29,10 @@ public class IndirectPrograms {
 		this.culling = culling;
 	}
 
-	static void reload(SourceLoader loadChecker, ImmutableList<PipelineProgramKey> pipelineKeys, UniformComponent uniformComponent, MaterialAdapterComponent vertexMaterialComponent, MaterialAdapterComponent fragmentMaterialComponent) {
+	static void reload(ShaderSources sources, ImmutableList<PipelineProgramKey> pipelineKeys, UniformComponent uniformComponent, MaterialAdapterComponent vertexMaterialComponent, MaterialAdapterComponent fragmentMaterialComponent) {
 		_delete();
-		var pipelineCompiler = PipelineCompiler.create(loadChecker, Pipelines.INDIRECT, pipelineKeys, uniformComponent, vertexMaterialComponent, fragmentMaterialComponent);
-		var cullingCompiler = CullingCompiler.create(loadChecker, createCullingKeys(), uniformComponent);
+		var pipelineCompiler = PipelineCompiler.create(sources, Pipelines.INDIRECT, pipelineKeys, uniformComponent, vertexMaterialComponent, fragmentMaterialComponent);
+		var cullingCompiler = createCullingCompiler(uniformComponent, sources);
 
 		try {
 			var pipelineResult = pipelineCompiler.compileAndReportErrors();
@@ -66,6 +72,18 @@ public class IndirectPrograms {
 		}
 	}
 
+	private static CompilationHarness<InstanceType<?>> createCullingCompiler(UniformComponent uniformComponent, ShaderSources sources) {
+		return new CompilationHarness<>(sources, createCullingKeys(), Compile.<InstanceType<?>>program()
+				.link(Compile.<InstanceType<?>>shader(GLSLVersion.V460, ShaderType.COMPUTE)
+						.withComponent(uniformComponent)
+						.withComponent(IndirectComponent::create)
+						.withResource(InstanceType::instanceShader)
+						.withResource(Files.INDIRECT_CULL))
+				.then((InstanceType<?> key, GlProgram program) -> {
+					program.setUniformBlockBinding("FLWUniforms", 0);
+				}));
+	}
+
 	public GlProgram getIndirectProgram(VertexType vertexType, InstanceType<?> instanceType, Context contextShader) {
 		return pipeline.get(new PipelineProgramKey(vertexType, instanceType, contextShader));
 	}
@@ -80,4 +98,8 @@ public class IndirectPrograms {
 		culling.values()
 				.forEach(GlProgram::delete);
 	}
+
+	private static final class Files {
+		public static final ResourceLocation INDIRECT_CULL = Flywheel.rl("internal/indirect_cull.glsl");
+	}
 }

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

@@ -12,6 +12,7 @@ import com.jozufozu.flywheel.api.vertex.VertexType;
 import com.jozufozu.flywheel.backend.compile.component.MaterialAdapterComponent;
 import com.jozufozu.flywheel.backend.compile.component.UniformComponent;
 import com.jozufozu.flywheel.gl.shader.GlProgram;
+import com.jozufozu.flywheel.glsl.ShaderSources;
 
 public class InstancingPrograms {
 	static InstancingPrograms instance;
@@ -21,9 +22,9 @@ public class InstancingPrograms {
 		this.pipeline = pipeline;
 	}
 
-	static void reload(SourceLoader loadChecker, ImmutableList<PipelineProgramKey> pipelineKeys, UniformComponent uniformComponent, MaterialAdapterComponent vertexMaterialComponent, MaterialAdapterComponent fragmentMaterialComponent) {
+	static void reload(ShaderSources sources, ImmutableList<PipelineProgramKey> pipelineKeys, UniformComponent uniformComponent, MaterialAdapterComponent vertexMaterialComponent, MaterialAdapterComponent fragmentMaterialComponent) {
 		_delete();
-		var instancingCompiler = PipelineCompiler.create(loadChecker, Pipelines.INSTANCED_ARRAYS, pipelineKeys, uniformComponent, vertexMaterialComponent, fragmentMaterialComponent);
+		var instancingCompiler = PipelineCompiler.create(sources, Pipelines.INSTANCED_ARRAYS, pipelineKeys, uniformComponent, vertexMaterialComponent, fragmentMaterialComponent);
 
 		try {
 			var result = instancingCompiler.compileAndReportErrors();

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

@@ -1,158 +1,37 @@
 package com.jozufozu.flywheel.backend.compile;
 
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Objects;
-
-import org.jetbrains.annotations.Nullable;
-
 import com.google.common.collect.ImmutableList;
 import com.jozufozu.flywheel.backend.compile.component.MaterialAdapterComponent;
 import com.jozufozu.flywheel.backend.compile.component.UniformComponent;
 import com.jozufozu.flywheel.gl.shader.GlProgram;
-import com.jozufozu.flywheel.gl.shader.GlShader;
 import com.jozufozu.flywheel.gl.shader.ShaderType;
 import com.jozufozu.flywheel.glsl.ShaderSources;
-import com.jozufozu.flywheel.glsl.SourceComponent;
 
-import net.minecraft.resources.ResourceLocation;
-
-public class PipelineCompiler extends AbstractCompiler<PipelineProgramKey> {
-	private final Pipeline pipeline;
-	private final List<SourceComponent> vertexPrelude = new ArrayList<>();
-	private final List<SourceComponent> vertexPostlude = new ArrayList<>();
-	private final List<SourceComponent> fragmentPrelude = new ArrayList<>();
-	private final List<SourceComponent> fragmentPostlude = new ArrayList<>();
-
-	public PipelineCompiler(ShaderSources sources, ImmutableList<PipelineProgramKey> keys, Pipeline pipeline) {
-		super(sources, keys);
-		this.pipeline = pipeline;
-	}
-
-	static PipelineCompiler create(SourceLoader sourceLoader, Pipeline pipeline, ImmutableList<PipelineProgramKey> pipelineKeys, UniformComponent uniformComponent, MaterialAdapterComponent vertexMaterialComponent, MaterialAdapterComponent fragmentMaterialComponent) {
-		var fragmentPipeline = sourceLoader.find(pipeline.fragmentShader());
-		var vertexPipeline = sourceLoader.find(pipeline.vertexShader());
-
-		return new PipelineCompiler(sourceLoader.sources, pipelineKeys, pipeline).addPrelude(uniformComponent)
-				.addFragmentPrelude(fragmentMaterialComponent)
-				.addVertexPrelude(vertexMaterialComponent)
-				.addFragmentPostlude(fragmentPipeline)
-				.addVertexPostlude(vertexPipeline);
-	}
-
-	public PipelineCompiler addPrelude(SourceComponent component) {
-		addVertexPrelude(component);
-		addFragmentPrelude(component);
-		return this;
-	}
-
-	public PipelineCompiler addVertexPrelude(SourceComponent component) {
-		vertexPrelude.add(component);
-		return this;
-	}
-
-	public PipelineCompiler addVertexPostlude(SourceComponent component) {
-		vertexPostlude.add(component);
-		return this;
-	}
-
-	public PipelineCompiler addFragmentPrelude(SourceComponent component) {
-		fragmentPrelude.add(component);
-		return this;
-	}
-
-	public PipelineCompiler addFragmentPostlude(SourceComponent component) {
-		fragmentPostlude.add(component);
-		return this;
-	}
-
-	@Nullable
-	@Override
-	protected GlProgram compile(PipelineProgramKey key) {
-		GlShader vertex = compileVertex(key);
-		GlShader fragment = compileFragment(key);
-
-		if (vertex == null || fragment == null) {
-			return null;
-		}
-
-		var glProgram = programLinker.link(vertex, fragment);
-		key.contextShader()
-				.onProgramLink(glProgram);
-		return glProgram;
-	}
-
-	@Nullable
-	private GlShader compileVertex(PipelineProgramKey key) {
-		var vertexComponents = getVertexComponents(key);
-		if (vertexComponents == null) {
-			return null;
-		}
-
-		return shaderCompiler.compile(pipeline.glslVersion(), ShaderType.VERTEX, vertexComponents);
-	}
-
-	@Nullable
-	private GlShader compileFragment(PipelineProgramKey key) {
-		var fragmentComponents = getFragmentComponents(key);
-		if (fragmentComponents == null) {
-			return null;
-		}
-
-		return shaderCompiler.compile(pipeline.glslVersion(), ShaderType.FRAGMENT, fragmentComponents);
-	}
-
-	@Nullable
-	private List<SourceComponent> getVertexComponents(PipelineProgramKey key) {
-		var instanceAssembly = pipeline.assembler()
-				.assemble(new Pipeline.InstanceAssemblerContext(key.vertexType(), key.instanceType()));
-
-		var layout = sourceLoader.find(key.vertexType()
-				.layoutShader());
-		var instance = sourceLoader.find(key.instanceType()
-				.instanceShader());
-		var context = sourceLoader.find(key.contextShader()
-				.vertexShader());
-
-		if (instanceAssembly == null || layout == null || instance == null || context == null) {
-			return null;
-		}
-
-		// Check this here to do a full dry-run in case of a preloading error.
-		if (vertexPrelude.stream()
-				.anyMatch(Objects::isNull) || vertexPostlude.stream()
-				.anyMatch(Objects::isNull)) {
-			return null;
-		}
-
-		return ImmutableList.<SourceComponent>builder()
-				.addAll(vertexPrelude)
-				.add(instanceAssembly, layout, instance, context)
-				.addAll(vertexPostlude)
-				.build();
-	}
-
-	@Nullable
-	private List<SourceComponent> getFragmentComponents(PipelineProgramKey key) {
-		ResourceLocation rl = key.contextShader()
-				.fragmentShader();
-		var context = sourceLoader.find(rl);
-
-		if (context == null) {
-			return null;
-		}
-
-		// Check this here to do a full dry-run in case of a preloading error.
-		if (fragmentPrelude.stream()
-				.anyMatch(Objects::isNull) || fragmentPostlude.stream()
-				.anyMatch(Objects::isNull)) {
-			return null;
-		}
-
-		return ImmutableList.<SourceComponent>builder()
-				.addAll(fragmentPrelude)
-				.add(context)
-				.addAll(fragmentPostlude)
-				.build();
+public class PipelineCompiler {
+	static CompilationHarness<PipelineProgramKey> create(ShaderSources sources, Pipeline pipeline, ImmutableList<PipelineProgramKey> pipelineKeys, UniformComponent uniformComponent, MaterialAdapterComponent vertexMaterialComponent, MaterialAdapterComponent fragmentMaterialComponent) {
+		return new CompilationHarness<>(sources, pipelineKeys, Compile.<PipelineProgramKey>program()
+				.link(Compile.<PipelineProgramKey>shader(pipeline.glslVersion(), ShaderType.VERTEX)
+						.withComponent(uniformComponent)
+						.withComponent(vertexMaterialComponent)
+						.withComponent(key -> pipeline.assembler()
+								.assemble(new Pipeline.InstanceAssemblerContext(key.vertexType(), key.instanceType())))
+						.withResource(key -> key.vertexType()
+								.layoutShader())
+						.withResource(key -> key.instanceType()
+								.instanceShader())
+						.withResource(key -> key.contextShader()
+								.vertexShader())
+						.withResource(pipeline.vertexShader()))
+				.link(Compile.<PipelineProgramKey>shader(pipeline.glslVersion(), ShaderType.FRAGMENT)
+						.withComponent(uniformComponent)
+						.withComponent(fragmentMaterialComponent)
+						.withResource(key -> key.contextShader()
+								.fragmentShader())
+						.withResource(pipeline.fragmentShader()))
+				.then((PipelineProgramKey key, GlProgram program) -> {
+					key.contextShader()
+							.onProgramLink(program);
+					program.setUniformBlockBinding("FLWUniforms", 0);
+				}));
 	}
 }

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

@@ -9,7 +9,7 @@ import net.minecraft.resources.ResourceLocation;
 
 public final class Pipelines {
 	public static final Pipeline INSTANCED_ARRAYS = Pipeline.builder()
-			.glslVersion(GLSLVersion.V420)
+			.glslVersion(GLSLVersion.V330)
 			.vertex(Files.INSTANCED_ARRAYS_DRAW)
 			.fragment(Files.DRAW_FRAGMENT)
 			.assembler(InstancedArraysComponent::new)

src/main/java/com/jozufozu/flywheel/backend/compile/component/MaterialAdapterComponent.java

@@ -87,7 +87,7 @@ public class MaterialAdapterComponent implements SourceComponent {
 				block.ret(adaptedCall);
 			}
 
-			sw.intCase(i, block);
+			sw.uintCase(i, block);
 		}
 
 		if (!isVoid) {

src/main/java/com/jozufozu/flywheel/backend/compile/component/UniformComponent.java

@@ -36,7 +36,6 @@ public class UniformComponent implements SourceComponent {
 
 		builder.uniformBlock()
 			.layout("std140")
-			.binding(0)
 			.name("FLWUniforms")
 			.member("flywheel_uniforms", "flywheel");
 

src/main/java/com/jozufozu/flywheel/backend/compile/core/ProgramLinker.java

@@ -8,6 +8,8 @@ import static org.lwjgl.opengl.GL20.glGetProgramInfoLog;
 import static org.lwjgl.opengl.GL20.glGetProgrami;
 import static org.lwjgl.opengl.GL20.glLinkProgram;
 
+import java.util.List;
+
 import org.jetbrains.annotations.Nullable;
 
 import com.jozufozu.flywheel.gl.shader.GlProgram;
@@ -21,14 +23,14 @@ public class ProgramLinker {
 	}
 
 	@Nullable
-	public GlProgram link(GlShader... shaders) {
+	public GlProgram link(List<GlShader> shaders) {
 		// this probably doesn't need caching
 		var linkResult = linkInternal(shaders);
 		stats.linkResult(linkResult);
 		return linkResult.unwrap();
 	}
 
-	private LinkResult linkInternal(GlShader... shaders) {
+	private LinkResult linkInternal(List<GlShader> shaders) {
 		int handle = glCreateProgram();
 
 		for (GlShader shader : shaders) {

src/main/java/com/jozufozu/flywheel/backend/compile/core/ShaderCompiler.java

@@ -32,7 +32,6 @@ public class ShaderCompiler {
 		}
 
 		Compilation ctx = new Compilation(glslVersion, shaderType);
-		ctx.enableExtension("GL_ARB_explicit_attrib_location");
 		ctx.enableExtension("GL_ARB_conservative_depth");
 
 		expand(sourceComponents, ctx::appendComponent);

src/main/java/com/jozufozu/flywheel/backend/compile/package-info.java

@@ -0,0 +1,6 @@
+@MethodsReturnNonnullByDefault @ParametersAreNonnullByDefault
+package com.jozufozu.flywheel.backend.compile;
+
+import javax.annotation.ParametersAreNonnullByDefault;
+
+import net.minecraft.MethodsReturnNonnullByDefault;

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

@@ -1,8 +1,11 @@
 package com.jozufozu.flywheel.gl.shader;
 
-import static org.lwjgl.opengl.GL20.glDeleteProgram;
-import static org.lwjgl.opengl.GL20.glGetUniformLocation;
-import static org.lwjgl.opengl.GL20.glUniform1i;
+import static org.lwjgl.opengl.GL31.GL_INVALID_INDEX;
+import static org.lwjgl.opengl.GL31.glGetUniformBlockIndex;
+import static org.lwjgl.opengl.GL31.glUniformBlockBinding;
+import static org.lwjgl.opengl.GL32.glDeleteProgram;
+import static org.lwjgl.opengl.GL32.glGetUniformLocation;
+import static org.lwjgl.opengl.GL32.glUniform1i;
 
 import org.slf4j.Logger;
 
@@ -55,6 +58,17 @@ public class GlProgram extends GlObject {
 		}
 	}
 
+	public void setUniformBlockBinding(String name, int binding) {
+		int index = glGetUniformBlockIndex(handle(), name);
+
+		if (index == GL_INVALID_INDEX) {
+			LOGGER.debug("No active uniform block '{}' exists. Could be unused.", name);
+			return;
+		}
+
+		glUniformBlockBinding(handle(), index, binding);
+	}
+
 	@Override
 	protected void deleteInternal(int handle) {
 		glDeleteProgram(handle);

src/main/java/com/jozufozu/flywheel/glsl/generate/GlslExpr.java

@@ -31,11 +31,15 @@ public interface GlslExpr {
 		return new FunctionCall0(functionName);
 	}
 
-	static GlslExpr literal(int expr) {
+	static GlslExpr intLiteral(int expr) {
 		return new IntLiteral(expr);
 	}
 
-	static GlslExpr literal(boolean expr) {
+	static GlslExpr uintLiteral(int expr) {
+		return new UIntLiteral(expr);
+	}
+
+	static GlslExpr boolLiteral(boolean expr) {
 		return new BoolLiteral(expr);
 	}
 
@@ -135,6 +139,19 @@ public interface GlslExpr {
 		}
 	}
 
+	record UIntLiteral(int value) implements GlslExpr {
+		public UIntLiteral {
+			if (value < 0) {
+				throw new IllegalArgumentException("UIntLiteral must be positive");
+			}
+		}
+
+		@Override
+		public String prettyPrint() {
+			return Integer.toString(value) + 'u';
+		}
+	}
+
 	record BoolLiteral(boolean value) implements GlslExpr {
 		@Override
 		public String prettyPrint() {

src/main/java/com/jozufozu/flywheel/glsl/generate/GlslSwitch.java

@@ -25,7 +25,11 @@ public class GlslSwitch implements GlslStmt {
 	}
 
 	public void intCase(int expr, GlslBlock block) {
-		cases.add(Pair.of(GlslExpr.literal(expr), block));
+		cases.add(Pair.of(GlslExpr.intLiteral(expr), block));
+	}
+
+	public void uintCase(int expr, GlslBlock block) {
+		cases.add(Pair.of(GlslExpr.uintLiteral(expr), block));
 	}
 
 	public void defaultCase(GlslBlock block) {
@@ -35,7 +39,7 @@ public class GlslSwitch implements GlslStmt {
 	@Override
 	public String prettyPrint() {
 		return """
-            switch (%s) {
+				switch (%s) {
             %s
             }""".formatted(on.prettyPrint(), formatCases());
 	}

src/main/java/com/jozufozu/flywheel/glsl/generate/GlslUniformBlock.java

@@ -8,19 +8,16 @@ import com.jozufozu.flywheel.util.Pair;
 import com.jozufozu.flywheel.util.StringUtil;
 
 public class GlslUniformBlock implements GlslBuilder.Declaration {
-
-
     private String qualifier;
-    private int binding;
-    private String name;
-    private final List<Pair<String, String>> members = new ArrayList<>();
+	private String name;
+	private final List<Pair<String, String>> members = new ArrayList<>();
 
     @Override
     public String prettyPrint() {
-        return """
-            layout(%s, binding = %d) uniform %s {
-            %s
-            };""".formatted(qualifier, binding, name, StringUtil.indent(formatMembers(), 4));
+		return """
+				layout(%s) uniform %s {
+				%s
+				};""".formatted(qualifier, name, StringUtil.indent(formatMembers(), 4));
     }
 
     private String formatMembers() {
@@ -34,15 +31,10 @@ public class GlslUniformBlock implements GlslBuilder.Declaration {
         return this;
     }
 
-    public GlslUniformBlock binding(int i) {
-        binding = i;
-        return this;
-    }
-
-    public GlslUniformBlock name(String name) {
-        this.name = name;
-        return this;
-    }
+	public GlslUniformBlock name(String name) {
+		this.name = name;
+		return this;
+	}
 
     public GlslUniformBlock member(String typeName, String variableName) {
         members.add(Pair.of(typeName, variableName));

src/main/java/com/jozufozu/flywheel/util/NonNullSupplier.java

@@ -4,7 +4,6 @@ import org.jetbrains.annotations.NotNull;
 
 @FunctionalInterface
 public interface NonNullSupplier<T> {
-
 	@NotNull
 	T get();
 }

src/main/java/com/jozufozu/flywheel/util/NotNullFunction.java

@@ -0,0 +1,8 @@
+package com.jozufozu.flywheel.util;
+
+import org.jetbrains.annotations.NotNull;
+
+@FunctionalInterface
+public interface NotNullFunction<T, R> {
+	@NotNull R apply(T t);
+}