Reduced to fragments

- Overhaul shader pipeline
  - Remove VertexType#getShaderHeader in favor of vertex-only "layout
shaders"
  - Remove program specs in favor of vertex-only "instance shaders"
  - Add API GLSL headers for vertex and fragment shaders that store
common values
  - Separate context shaders into vertex and fragment shader files
- Improve import handling
  - Ensure imports are not added more than once
  - Change regex for import directives to be more in line with C-style
directives
- Move some classes and GLSL files

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

@@ -13,6 +13,8 @@ import com.jozufozu.flywheel.core.Models;
 import com.jozufozu.flywheel.core.PartialModel;
 import com.jozufozu.flywheel.core.StitchedSprite;
 import com.jozufozu.flywheel.core.compile.ProgramCompiler;
+import com.jozufozu.flywheel.core.materials.InstanceShaders;
+import com.jozufozu.flywheel.core.vertex.LayoutShaders;
 import com.jozufozu.flywheel.event.ReloadRenderersEvent;
 import com.jozufozu.flywheel.mixin.PausedPartialTickAccessor;
 import com.jozufozu.flywheel.vanilla.VanillaInstances;
@@ -73,6 +75,8 @@ public class Flywheel {
 		forgeEventBus.<ReloadRenderersEvent>addListener(ProgramCompiler::invalidateAll);
 		forgeEventBus.addListener(Models::onReload);
 
+		modEventBus.addListener(LayoutShaders::flwInit);
+		modEventBus.addListener(InstanceShaders::flwInit);
 		modEventBus.addListener(Contexts::flwInit);
 		modEventBus.addListener(PartialModel::onModelRegistry);
 		modEventBus.addListener(PartialModel::onModelBake);

src/main/java/com/jozufozu/flywheel/api/struct/Instanced.java

@@ -1,8 +1,7 @@
 package com.jozufozu.flywheel.api.struct;
 
 import com.jozufozu.flywheel.backend.gl.buffer.VecBuffer;
-
-import net.minecraft.resources.ResourceLocation;
+import com.jozufozu.flywheel.core.source.FileResolution;
 
 public interface Instanced<S> extends StructType<S> {
 	/**
@@ -12,6 +11,5 @@ public interface Instanced<S> extends StructType<S> {
 	 */
 	StructWriter<S> getWriter(VecBuffer backing);
 
-	ResourceLocation getProgramSpec();
-
+	FileResolution getInstanceShader();
 }

src/main/java/com/jozufozu/flywheel/api/vertex/VertexType.java

@@ -3,6 +3,7 @@ package com.jozufozu.flywheel.api.vertex;
 import java.nio.ByteBuffer;
 
 import com.jozufozu.flywheel.core.layout.BufferLayout;
+import com.jozufozu.flywheel.core.source.FileResolution;
 
 /**
  * A vertex type containing metadata about a specific vertex layout.
@@ -32,7 +33,7 @@ public interface VertexType {
 	 */
 	VertexList createReader(ByteBuffer buffer, int vertexCount);
 
-	String getShaderHeader();
+	FileResolution getLayoutShader();
 
 	default int getStride() {
 		return getLayout().getStride();

src/main/java/com/jozufozu/flywheel/backend/Backend.java

@@ -8,11 +8,9 @@ import com.jozufozu.flywheel.backend.gl.versioned.GlCompat;
 import com.jozufozu.flywheel.backend.instancing.ParallelTaskEngine;
 import com.jozufozu.flywheel.config.BackendType;
 import com.jozufozu.flywheel.config.FlwConfig;
-import com.jozufozu.flywheel.core.shader.ProgramSpec;
 import com.mojang.logging.LogUtils;
 
 import net.minecraft.client.Minecraft;
-import net.minecraft.resources.ResourceLocation;
 import net.minecraft.world.level.Level;
 import net.minecraft.world.level.LevelAccessor;
 
@@ -53,11 +51,6 @@ public class Backend {
 		return backendType == null ? "Uninitialized" : backendType.getProperName();
 	}
 
-	@Nullable
-	public static ProgramSpec getSpec(ResourceLocation name) {
-		return loader.get(name);
-	}
-
 	public static void refresh() {
 		backendType = chooseEngine();
 	}

src/main/java/com/jozufozu/flywheel/backend/Loader.java

@@ -1,32 +1,15 @@
 package com.jozufozu.flywheel.backend;
 
-import java.util.Collection;
-import java.util.HashMap;
-import java.util.Map;
-
-import org.jetbrains.annotations.Nullable;
-
-import com.google.gson.Gson;
-import com.google.gson.GsonBuilder;
-import com.google.gson.JsonElement;
 import com.jozufozu.flywheel.backend.instancing.InstancedRenderDispatcher;
 import com.jozufozu.flywheel.core.GameStateRegistry;
 import com.jozufozu.flywheel.core.crumbling.CrumblingRenderer;
-import com.jozufozu.flywheel.core.shader.ProgramSpec;
 import com.jozufozu.flywheel.core.source.Resolver;
 import com.jozufozu.flywheel.core.source.ShaderSources;
 import com.jozufozu.flywheel.event.GatherContextEvent;
-import com.jozufozu.flywheel.util.ResourceUtil;
-import com.jozufozu.flywheel.util.StringUtil;
-import com.mojang.datafixers.util.Pair;
-import com.mojang.serialization.DataResult;
-import com.mojang.serialization.JsonOps;
 
 import net.minecraft.client.Minecraft;
 import net.minecraft.client.multiplayer.ClientLevel;
-import net.minecraft.resources.ResourceLocation;
 import net.minecraft.server.packs.resources.ReloadableResourceManager;
-import net.minecraft.server.packs.resources.Resource;
 import net.minecraft.server.packs.resources.ResourceManager;
 import net.minecraft.server.packs.resources.ResourceManagerReloadListener;
 import net.minecraftforge.fml.ModLoader;
@@ -39,11 +22,6 @@ import net.minecraftforge.fml.ModLoader;
  * </p>
  */
 public class Loader implements ResourceManagerReloadListener {
-	public static final String PROGRAM_DIR = "flywheel/programs/";
-	private static final Gson GSON = new GsonBuilder().create();
-
-	private final Map<ResourceLocation, ProgramSpec> programs = new HashMap<>();
-
 	private boolean firstLoad = true;
 
 	Loader() {
@@ -57,11 +35,6 @@ public class Loader implements ResourceManagerReloadListener {
 		}
 	}
 
-	@Nullable
-	public ProgramSpec get(ResourceLocation name) {
-		return programs.get(name);
-	}
-
 	@Override
 	public void onResourceManagerReload(ResourceManager manager) {
 		Backend.refresh();
@@ -74,8 +47,6 @@ public class Loader implements ResourceManagerReloadListener {
 
 		ShaderSources sources = new ShaderSources(manager);
 
-		loadProgramSpecs(manager);
-
 		Resolver.INSTANCE.run(sources);
 
 		Backend.LOGGER.info("Loaded all shader sources.");
@@ -89,35 +60,4 @@ public class Loader implements ResourceManagerReloadListener {
 
 		firstLoad = false;
 	}
-
-	private void loadProgramSpecs(ResourceManager manager) {
-		programs.clear();
-
-		Collection<ResourceLocation> programSpecs = manager.listResources(PROGRAM_DIR, s -> s.endsWith(".json"));
-
-		for (ResourceLocation location : programSpecs) {
-			try (Resource file = manager.getResource(location)) {
-				String s = StringUtil.readToString(file.getInputStream());
-
-				ResourceLocation specName = ResourceUtil.trim(location, PROGRAM_DIR, ".json");
-
-				DataResult<Pair<ProgramSpec, JsonElement>> result = ProgramSpec.CODEC.decode(JsonOps.INSTANCE, GSON.fromJson(s, JsonElement.class));
-
-				ProgramSpec spec = result.get()
-						.orThrow()
-						.getFirst();
-
-				spec.setName(specName);
-
-				if (programs.containsKey(specName)) {
-					throw new IllegalStateException("Program spec '" + specName + "' already registered.");
-				}
-				programs.put(specName, spec);
-
-			} catch (Exception e) {
-				Backend.LOGGER.error("Could not load program " + location, e);
-			}
-		}
-	}
-
 }

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

@@ -21,10 +21,20 @@ public class GlShader extends GlObject {
 		GlCompat.safeShaderSource(handle, source);
 		GL20.glCompileShader(handle);
 
+//		File dir = new File(Minecraft.getInstance().gameDirectory, "flywheel_sources");
+//		dir.mkdirs();
+//		File file = new File(dir, name.toString().replaceAll("[:/]", "_"));
+//		try (FileWriter writer = new FileWriter(file)) {
+//			writer.write(source);
+//		} catch (Exception e) {
+//			e.printStackTrace();
+//		}
+
 //		String log = GL20.glGetShaderInfoLog(handle);
 //
 //		if (!log.isEmpty()) {
-//			env.printShaderInfoLog(source, log, this.name);
+//			System.out.println(log);
+////			env.printShaderInfoLog(source, log, this.name);
 //		}
 
 		if (GL20.glGetShaderi(handle, GL20.GL_COMPILE_STATUS) != GL20.GL_TRUE) {

src/main/java/com/jozufozu/flywheel/backend/instancing/blockentity/BlockEntityInstance.java

@@ -5,7 +5,7 @@ import com.jozufozu.flywheel.api.MaterialManager;
 import com.jozufozu.flywheel.api.instance.DynamicInstance;
 import com.jozufozu.flywheel.api.instance.TickableInstance;
 import com.jozufozu.flywheel.backend.instancing.AbstractInstance;
-import com.jozufozu.flywheel.core.Materials;
+import com.jozufozu.flywheel.core.materials.Materials;
 import com.jozufozu.flywheel.core.materials.model.ModelData;
 import com.jozufozu.flywheel.core.materials.oriented.OrientedData;
 import com.jozufozu.flywheel.util.box.GridAlignedBB;

src/main/java/com/jozufozu/flywheel/backend/instancing/instancing/InstancingEngine.java

@@ -14,13 +14,14 @@ import com.jozufozu.flywheel.api.struct.StructType;
 import com.jozufozu.flywheel.backend.instancing.Engine;
 import com.jozufozu.flywheel.backend.instancing.TaskEngine;
 import com.jozufozu.flywheel.backend.model.MeshPool;
-import com.jozufozu.flywheel.core.Formats;
-import com.jozufozu.flywheel.core.RenderContext;
 import com.jozufozu.flywheel.core.CoreShaderInfoMap;
 import com.jozufozu.flywheel.core.CoreShaderInfoMap.CoreShaderInfo;
+import com.jozufozu.flywheel.core.GameStateRegistry;
+import com.jozufozu.flywheel.core.RenderContext;
 import com.jozufozu.flywheel.core.compile.ProgramCompiler;
 import com.jozufozu.flywheel.core.compile.ProgramContext;
 import com.jozufozu.flywheel.core.shader.WorldProgram;
+import com.jozufozu.flywheel.core.vertex.Formats;
 import com.jozufozu.flywheel.util.Textures;
 import com.jozufozu.flywheel.util.WeakHashSet;
 import com.mojang.blaze3d.systems.RenderSystem;
@@ -32,7 +33,6 @@ import net.minecraft.client.renderer.RenderType;
 import net.minecraft.client.renderer.ShaderInstance;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.Vec3i;
-import net.minecraft.resources.ResourceLocation;
 import net.minecraft.util.Mth;
 
 public class InstancingEngine<P extends WorldProgram> implements Engine {
@@ -118,7 +118,7 @@ public class InstancingEngine<P extends WorldProgram> implements Engine {
 			if (!toRender.isEmpty()) {
 				Instanced<? extends InstanceData> instanceType = entry.getKey();
 
-				setup(instanceType.getProgramSpec(), coreShaderInfo, camX, camY, camZ, viewProjection, level);
+				setup(instanceType, coreShaderInfo, camX, camY, camZ, viewProjection, level);
 
 				instanceCount += material.getInstanceCount();
 				vertexCount += material.getVertexCount();
@@ -145,7 +145,7 @@ public class InstancingEngine<P extends WorldProgram> implements Engine {
 		return coreShaderInfo;
 	}
 
-	protected P setup(ResourceLocation programSpec, CoreShaderInfo coreShaderInfo, double camX, double camY, double camZ, Matrix4f viewProjection, ClientLevel level) {
+	protected P setup(Instanced<?> instanceType, CoreShaderInfo coreShaderInfo, double camX, double camY, double camZ, Matrix4f viewProjection, ClientLevel level) {
 		float alphaDiscard = coreShaderInfo.alphaDiscard();
 		if (alphaDiscard == 0) {
 			alphaDiscard = 0.0001f;
@@ -153,7 +153,7 @@ public class InstancingEngine<P extends WorldProgram> implements Engine {
 			alphaDiscard = 0;
 		}
 
-		P program = context.getProgram(ProgramContext.create(programSpec, Formats.POS_TEX_NORMAL, alphaDiscard, coreShaderInfo.fogType()));
+		P program = context.getProgram(new ProgramContext(Formats.POS_TEX_NORMAL, instanceType.getInstanceShader(), alphaDiscard, coreShaderInfo.fogType(), GameStateRegistry.takeSnapshot()));
 
 		program.bind();
 		program.uploadUniforms(camX, camY, camZ, viewProjection, level);

src/main/java/com/jozufozu/flywheel/core/Contexts.java

@@ -20,11 +20,13 @@ public class Contexts {
 	public static void flwInit(GatherContextEvent event) {
 		GameStateRegistry.register(NormalDebugStateProvider.INSTANCE);
 
-		FileResolution worldBuiltins = Resolver.INSTANCE.get(ResourceUtil.subPath(Names.WORLD, ".glsl"));
-		FileResolution crumblingBuiltins = Resolver.INSTANCE.get(ResourceUtil.subPath(Names.CRUMBLING, ".glsl"));
+		FileResolution worldVertex = Resolver.INSTANCE.get(ResourceUtil.subPath(Names.WORLD, ".vert"));
+		FileResolution worldFragment = Resolver.INSTANCE.get(ResourceUtil.subPath(Names.WORLD, ".frag"));
+		FileResolution crumblingVertex = Resolver.INSTANCE.get(ResourceUtil.subPath(Names.CRUMBLING, ".vert"));
+		FileResolution crumblingFragment = Resolver.INSTANCE.get(ResourceUtil.subPath(Names.CRUMBLING, ".frag"));
 
-		WORLD = ProgramCompiler.create(Templates.INSTANCING, WorldProgram::new, worldBuiltins);
-		CRUMBLING = ProgramCompiler.create(Templates.INSTANCING, CrumblingProgram::new, crumblingBuiltins);
+		WORLD = ProgramCompiler.create(WorldProgram::new, Templates.INSTANCING, Templates.FRAGMENT, worldVertex, worldFragment);
+		CRUMBLING = ProgramCompiler.create(CrumblingProgram::new, Templates.INSTANCING, Templates.FRAGMENT, crumblingVertex, crumblingFragment);
 	}
 
 	public static class Names {

src/main/java/com/jozufozu/flywheel/core/Programs.java

@@ -1,10 +0,0 @@
-package com.jozufozu.flywheel.core;
-
-import com.jozufozu.flywheel.Flywheel;
-
-import net.minecraft.resources.ResourceLocation;
-
-public class Programs {
-	public static final ResourceLocation TRANSFORMED = Flywheel.rl("model");
-	public static final ResourceLocation ORIENTED = Flywheel.rl("oriented");
-}

src/main/java/com/jozufozu/flywheel/core/compile/CompileUtil.java

@@ -12,12 +12,11 @@ public class CompileUtil {
 	public static final Pattern matType = Pattern.compile("^mat([234])(?:x([234]))?$");
 
 	protected static String generateHeader(GLSLVersion version, ShaderType type) {
-		return "#version "
-				+ version
-				+ '\n'
+		return "#version " + version + '\n'
 				+ "#extension GL_ARB_explicit_attrib_location : enable\n"
 				+ "#extension GL_ARB_conservative_depth : enable\n"
-				+ type.getDefineStatement();
+				+ type.getDefineStatement()
+				+ '\n';
 	}
 
 	public static int getElementCount(String type) {

src/main/java/com/jozufozu/flywheel/core/compile/FragmentCompiler.java

@@ -9,15 +9,14 @@ import com.jozufozu.flywheel.core.shader.ShaderConstants;
 import com.jozufozu.flywheel.core.shader.StateSnapshot;
 import com.jozufozu.flywheel.core.source.FileIndexImpl;
 import com.jozufozu.flywheel.core.source.FileResolution;
-import com.jozufozu.flywheel.core.source.SourceFile;
 
 public class FragmentCompiler extends Memoizer<FragmentCompiler.Context, GlShader> {
 	private final Template<? extends FragmentData> template;
-	private final FileResolution header;
+	private final FileResolution contextShader;
 
-	public FragmentCompiler(Template<? extends FragmentData> template, FileResolution header) {
-		this.header = header;
+	public FragmentCompiler(Template<? extends FragmentData> template, FileResolution contextShader) {
 		this.template = template;
+		this.contextShader = contextShader;
 	}
 
 	@Override
@@ -27,16 +26,16 @@ public class FragmentCompiler extends Memoizer<FragmentCompiler.Context, GlShade
 		finalSource.append(CompileUtil.generateHeader(template.getVersion(), ShaderType.FRAGMENT));
 
 		key.getShaderConstants().writeInto(finalSource);
+		finalSource.append('\n');
 
 		FileIndexImpl index = new FileIndexImpl();
 
-		header.getFile().generateFinalSource(index, finalSource);
-		key.file.generateFinalSource(index, finalSource);
+		contextShader.getFile().generateFinalSource(index, finalSource);
 
-		FragmentData appliedTemplate = template.apply(key.file);
+		FragmentData appliedTemplate = template.apply(contextShader.getFile());
 		finalSource.append(appliedTemplate.generateFooter());
 
-		return new GlShader(key.file.name, ShaderType.FRAGMENT, finalSource.toString());
+		return new GlShader(contextShader.getFile().name, ShaderType.FRAGMENT, finalSource.toString());
 	}
 
 	@Override
@@ -48,11 +47,6 @@ public class FragmentCompiler extends Memoizer<FragmentCompiler.Context, GlShade
 	 * Represents the conditions under which a shader is compiled.
 	 */
 	public static final class Context {
-		/**
-		 * The file to compile.
-		 */
-		private final SourceFile file;
-
 		/**
 		 * The shader constants to apply.
 		 */
@@ -68,11 +62,10 @@ public class FragmentCompiler extends Memoizer<FragmentCompiler.Context, GlShade
 		 */
 		private final FogType fogType;
 
-		public Context(SourceFile file, StateSnapshot ctx, float alphaDiscard, FogType fogType) {
-			this.file = file;
-			this.ctx = ctx;
+		public Context(float alphaDiscard, FogType fogType, StateSnapshot ctx) {
 			this.alphaDiscard = alphaDiscard;
 			this.fogType = fogType;
+			this.ctx = ctx;
 		}
 
 		public ShaderConstants getShaderConstants() {
@@ -91,17 +84,17 @@ public class FragmentCompiler extends Memoizer<FragmentCompiler.Context, GlShade
 			if (obj == this) return true;
 			if (obj == null || obj.getClass() != this.getClass()) return false;
 			var that = (Context) obj;
-			return this.file == that.file && Objects.equals(this.ctx, that.ctx) && Float.floatToIntBits(this.alphaDiscard) == Float.floatToIntBits(that.alphaDiscard) && fogType == that.fogType;
+			return Objects.equals(this.ctx, that.ctx) && Float.floatToIntBits(this.alphaDiscard) == Float.floatToIntBits(that.alphaDiscard) && fogType == that.fogType;
 		}
 
 		@Override
 		public int hashCode() {
-			return Objects.hash(file, ctx, alphaDiscard, fogType);
+			return Objects.hash(alphaDiscard, fogType, ctx);
 		}
 
 		@Override
 		public String toString() {
-			return "Context[" + "file=" + file + ", " + "ctx=" + ctx + ", " + "alphaDiscard=" + alphaDiscard + ", " + "fogType=" + fogType + ']';
+			return "Context[" + "alphaDiscard=" + alphaDiscard + ", " + "fogType=" + fogType + ", " + "ctx=" + ctx + ']';
 		}
 
 	}

src/main/java/com/jozufozu/flywheel/core/compile/FragmentTemplateData.java

@@ -3,85 +3,46 @@ package com.jozufozu.flywheel.core.compile;
 import java.util.Optional;
 
 import com.google.common.collect.ImmutableList;
+import com.jozufozu.flywheel.core.source.ShaderLoadingException;
 import com.jozufozu.flywheel.core.source.SourceFile;
 import com.jozufozu.flywheel.core.source.error.ErrorReporter;
 import com.jozufozu.flywheel.core.source.parse.ShaderFunction;
-import com.jozufozu.flywheel.core.source.parse.ShaderStruct;
-import com.jozufozu.flywheel.core.source.parse.StructField;
 import com.jozufozu.flywheel.core.source.parse.Variable;
-import com.jozufozu.flywheel.core.source.span.Span;
 
 public class FragmentTemplateData implements FragmentData {
 	public final SourceFile file;
-	public final Span interpolantName;
-	public final ShaderStruct interpolant;
-	public final ShaderFunction fragmentMain;
+	public final ShaderFunction contextFragment;
 
 	public FragmentTemplateData(SourceFile file) {
 		this.file = file;
 
-		Optional<ShaderFunction> maybeFragmentMain = file.findFunction("fragment");
+		Optional<ShaderFunction> maybeContextFragment = file.findFunction("flw_contextFragment");
 
-		if (maybeFragmentMain.isEmpty()) {
-			ErrorReporter.generateMissingFunction(file, "fragment", "\"fragment\" function not defined");
-			throw new RuntimeException();
+		if (maybeContextFragment.isEmpty()) {
+			ErrorReporter.generateMissingFunction(file, "flw_contextFragment", "\"flw_contextFragment\" function not defined");
+			throw new ShaderLoadingException();
 		}
 
-		fragmentMain = maybeFragmentMain.get();
-		ImmutableList<Variable> fragmentParameters = fragmentMain.getParameters();
+		contextFragment = maybeContextFragment.get();
+		ImmutableList<Variable> params = contextFragment.getParameters();
 
-		if (fragmentParameters.size() != 1) {
-			ErrorReporter.generateSpanError(fragmentMain.getArgs(), "fragment function must have exactly one argument");
-			throw new RuntimeException();
+		if (params.size() != 0) {
+			ErrorReporter.generateSpanError(contextFragment.getArgs(), "\"flw_contextFragment\" function must not have any arguments");
+			throw new ShaderLoadingException();
 		}
-
-		interpolantName = fragmentMain.getParameters().get(0).type;
-
-		Optional<ShaderStruct> maybeInterpolant = file.findStruct(interpolantName);
-
-		if (maybeInterpolant.isEmpty()) {
-			ErrorReporter.generateMissingStruct(file, interpolantName, "struct not defined");
-
-			throw new RuntimeException();
-		}
-
-		interpolant = maybeInterpolant.get();
 	}
 
 	@Override
 	public String generateFooter() {
 		StringBuilder builder = new StringBuilder();
-		prefixFields(builder, interpolant, "in", "v2f_");
 
-		builder.append(String.format("""
+		builder.append("""
 				void main() {
-				    Fragment o;
-					o.color = v2f_color;
-					o.texCoords = v2f_texCoords;
-					o.light = v2f_light;
-					o.diffuse = v2f_diffuse;
-
-				    vec4 color = %s;
-				    FLWFinalizeColor(color);
+				    flw_contextFragment();
 				}
-				""",
-				fragmentMain.call("o")
-		));
+				"""
+		);
 
 		return builder.toString();
 	}
-
-	public static void prefixFields(StringBuilder builder, ShaderStruct struct, String qualifier, String prefix) {
-		ImmutableList<StructField> fields = struct.getFields();
-
-		for (StructField field : fields) {
-			builder.append(qualifier)
-					.append(' ')
-					.append(field.type)
-					.append(' ')
-					.append(prefix)
-					.append(field.name)
-					.append(";\n");
-		}
-	}
 }

src/main/java/com/jozufozu/flywheel/core/compile/InstancingTemplateData.java

@@ -15,45 +15,30 @@ import com.jozufozu.flywheel.core.source.parse.Variable;
 import com.jozufozu.flywheel.core.source.span.Span;
 
 public class InstancingTemplateData implements VertexData {
-
 	public final SourceFile file;
-	public final ShaderFunction vertexMain;
-	public final Span vertexName;
+	public final ShaderFunction instanceVertex;
 	public final Span instanceName;
 	public final ShaderStruct instance;
 
 	public InstancingTemplateData(SourceFile file) {
 		this.file = file;
 
-		Optional<ShaderFunction> vertexFunc = file.findFunction("vertex");
+		Optional<ShaderFunction> maybeInstanceVertex = file.findFunction("flw_instanceVertex");
 
-		if (vertexFunc.isEmpty()) {
-			ErrorReporter.generateFileError(file, "could not find \"vertex\" function");
+		if (maybeInstanceVertex.isEmpty()) {
+			ErrorReporter.generateMissingFunction(file, "flw_instanceVertex", "\"flw_instanceVertex\" function not defined");
 			throw new ShaderLoadingException();
 		}
 
-		vertexMain = vertexFunc.get();
-		ImmutableList<Variable> vertexParams = vertexMain.getParameters();
+		instanceVertex = maybeInstanceVertex.get();
+		ImmutableList<Variable> params = instanceVertex.getParameters();
 
-		if (vertexParams.size() != 2) {
-			ErrorReporter.generateSpanError(vertexMain.getArgs(), "instancing requires vertex function to have 2 arguments");
+		if (params.size() != 1) {
+			ErrorReporter.generateSpanError(instanceVertex.getArgs(), "\"flw_contextFragment\" function must have exactly 1 argument");
 			throw new ShaderLoadingException();
 		}
 
-		Variable vertexParam = vertexParams.get(0);
-		vertexName = vertexParam.type;
-
-		boolean namedVertex = vertexParam.type
-				.toString()
-				.equals("Vertex");
-
-		if (!(namedVertex && vertexParam.qualifier == Variable.Qualifier.INOUT)) {
-			ErrorReporter.generateSpanError(vertexParam.qualifierSpan, "first parameter must be inout Vertex");
-			throw new ShaderLoadingException();
-		}
-
-		instanceName = vertexParams.get(1).type;
-
+		instanceName = params.get(0).type;
 		Optional<ShaderStruct> maybeInstance = file.findStruct(instanceName);
 
 		if (maybeInstance.isEmpty()) {
@@ -80,36 +65,26 @@ public class InstancingTemplateData implements VertexData {
 					.append(' ')
 					.append(field.type)
 					.append(' ')
-					.append("a_i_")
+					.append("_flw_a_i_")
 					.append(field.name)
 					.append(";\n");
 			attributeBinding += CompileUtil.getAttributeCount(field.type);
 		}
+		template.append('\n');
+
 		template.append(String.format("""
-						out vec4 v2f_color;
-						out vec2 v2f_texCoords;
-						out vec2 v2f_light;
-						out float v2f_diffuse;
-
 						void main() {
-						    Vertex v = FLWCreateVertex();
-						    %s i;
-						    %s
-						    vertex(v, i);
-						    gl_Position = FLWVertex(v);
-						    v.normal = normalize(v.normal);
+							flw_layoutVertex();
 
-						    v2f_color = v.color;
-						    v2f_texCoords = v.texCoords;
-						    v2f_light = v.light;
-						    v2f_diffuse = FLWDiffuse(v.normal);
-						    #if defined(DEBUG_NORMAL)
-						    v2f_color = vec4(v.normal, 1.);
-						    #endif
+							%s instance;
+							%s
+							flw_instanceVertex(instance);
+
+							flw_contextVertex();
 						}
 						""",
 				instanceName,
-				assignFields(instance, "i.", "a_i_")
+				assignFields(instance, "instance.", "_flw_a_i_")
 		));
 
 		return template.toString();

src/main/java/com/jozufozu/flywheel/core/compile/ProgramCompiler.java

@@ -4,7 +4,6 @@ import java.util.ArrayList;
 import java.util.List;
 
 import com.jozufozu.flywheel.backend.gl.shader.GlProgram;
-import com.jozufozu.flywheel.core.Templates;
 import com.jozufozu.flywheel.core.source.FileResolution;
 import com.jozufozu.flywheel.event.ReloadRenderersEvent;
 
@@ -33,15 +32,17 @@ public class ProgramCompiler<P extends GlProgram> extends Memoizer<ProgramContex
 	}
 
 	/**
-	 * Creates a program compiler using this template.
-	 * @param template The vertex template to use.
+	 * Creates a program compiler using provided templates and headers.
 	 * @param factory A factory to add meaning to compiled programs.
-	 * @param header The header file to use for the program.
+	 * @param vertexTemplate The vertex template to use.
+	 * @param fragmentTemplate The fragment template to use.
+	 * @param vertexContextShader The context shader to use when compiling vertex shaders.
+	 * @param fragmentContextShader The context shader to use when compiling fragment shaders.
 	 * @param <P> The type of program to compile.
 	 * @return A program compiler.
 	 */
-	public static <T extends VertexData, P extends GlProgram> ProgramCompiler<P> create(Template<T> template, GlProgram.Factory<P> factory, FileResolution header) {
-		return new ProgramCompiler<>(factory, new VertexCompiler(template, header), new FragmentCompiler(Templates.FRAGMENT, header));
+	public static <V extends VertexData, F extends FragmentData, P extends GlProgram> ProgramCompiler<P> create(GlProgram.Factory<P> factory, Template<V> vertexTemplate, Template<F> fragmentTemplate, FileResolution vertexContextShader, FileResolution fragmentContextShader) {
+		return new ProgramCompiler<>(factory, new VertexCompiler(vertexTemplate, vertexContextShader), new FragmentCompiler(fragmentTemplate, fragmentContextShader));
 	}
 
 	/**
@@ -63,9 +64,9 @@ public class ProgramCompiler<P extends GlProgram> extends Memoizer<ProgramContex
 
 	@Override
 	protected P _create(ProgramContext ctx) {
-		return new ProgramAssembler(ctx.spec.name)
-				.attachShader(vertexCompiler.get(new VertexCompiler.Context(ctx.spec.getVertexFile(), ctx.ctx, ctx.vertexType)))
-				.attachShader(fragmentCompiler.get(new FragmentCompiler.Context(ctx.spec.getFragmentFile(), ctx.ctx, ctx.alphaDiscard, ctx.fogType)))
+		return new ProgramAssembler(ctx.instanceShader.getFileLoc())
+				.attachShader(vertexCompiler.get(new VertexCompiler.Context(ctx.vertexType, ctx.instanceShader.getFile(), ctx.ctx)))
+				.attachShader(fragmentCompiler.get(new FragmentCompiler.Context(ctx.alphaDiscard, ctx.fogType, ctx.ctx)))
 				.link()
 				.build(this.factory);
 	}

src/main/java/com/jozufozu/flywheel/core/compile/ProgramContext.java

@@ -3,54 +3,33 @@ package com.jozufozu.flywheel.core.compile;
 import java.util.Objects;
 
 import com.jozufozu.flywheel.api.vertex.VertexType;
-import com.jozufozu.flywheel.backend.Backend;
 import com.jozufozu.flywheel.core.CoreShaderInfoMap.CoreShaderInfo.FogType;
-import com.jozufozu.flywheel.core.GameStateRegistry;
-import com.jozufozu.flywheel.core.shader.ProgramSpec;
 import com.jozufozu.flywheel.core.shader.StateSnapshot;
-
-import net.minecraft.resources.ResourceLocation;
+import com.jozufozu.flywheel.core.source.FileResolution;
 
 /**
  * Represents the entire context of a program's usage.
  */
 public final class ProgramContext {
-	/**
-	 * Creates a compilation context for the given program, vertex type and render layer.
-	 *
-	 * @param programName 	The name of the program to use.
-	 * @param vertexType  	The vertex type to use.
-	 * @param alphaDiscard	The alpha threshold below which pixels are discarded.
-	 * @return A compilation context.
-	 */
-	public static ProgramContext create(ResourceLocation programName, VertexType vertexType, float alphaDiscard, FogType fogType) {
-		ProgramSpec spec = Backend.getSpec(programName);
 
-		if (spec == null) {
-			throw new NullPointerException("Cannot compile shader because '" + programName + "' is not recognized.");
-		}
-
-		return new ProgramContext(spec, alphaDiscard, fogType, vertexType, GameStateRegistry.takeSnapshot());
-	}
-
-	public final ProgramSpec spec;
+	public final VertexType vertexType;
+	public final FileResolution instanceShader;
 	public final float alphaDiscard;
 	public final FogType fogType;
-	public final VertexType vertexType;
 	public final StateSnapshot ctx;
 
 	/**
+	 * @param vertexType   	The vertexType the program should be adapted for.
 	 * @param spec			The program to use.
 	 * @param alphaDiscard 	Alpha threshold below which pixels are discarded.
 	 * @param fogType       Which type of fog should be applied.
-	 * @param vertexType   	The vertexType the program should be adapted for.
 	 * @param ctx          	A snapshot of the game state.
 	 */
-	public ProgramContext(ProgramSpec spec, float alphaDiscard, FogType fogType, VertexType vertexType, StateSnapshot ctx) {
-		this.spec = spec;
+	public ProgramContext(VertexType vertexType, FileResolution instanceShader, float alphaDiscard, FogType fogType, StateSnapshot ctx) {
+		this.vertexType = vertexType;
+		this.instanceShader = instanceShader;
 		this.alphaDiscard = alphaDiscard;
 		this.fogType = fogType;
-		this.vertexType = vertexType;
 		this.ctx = ctx;
 	}
 
@@ -59,16 +38,16 @@ public final class ProgramContext {
 		if (this == o) return true;
 		if (o == null || getClass() != o.getClass()) return false;
 		var that = (ProgramContext) o;
-		return spec == that.spec && vertexType == that.vertexType && ctx.equals(that.ctx) && Float.floatToIntBits(alphaDiscard) == Float.floatToIntBits(that.alphaDiscard) && fogType == that.fogType;
+		return instanceShader == that.instanceShader && vertexType == that.vertexType && ctx.equals(that.ctx) && Float.floatToIntBits(alphaDiscard) == Float.floatToIntBits(that.alphaDiscard) && fogType == that.fogType;
 	}
 
 	@Override
 	public int hashCode() {
-		return Objects.hash(spec, alphaDiscard, fogType, vertexType, ctx);
+		return Objects.hash(vertexType, instanceShader, alphaDiscard, fogType, ctx);
 	}
 
 	@Override
 	public String toString() {
-		return "ProgramContext{" + "spec=" + spec + ", alphaDiscard=" + alphaDiscard + ", fogType=" + fogType + ", vertexType=" + vertexType + ", ctx=" + ctx + '}';
+		return "ProgramContext{" + "vertexType=" + vertexType + ", instanceShader=" + instanceShader + ", alphaDiscard=" + alphaDiscard + ", fogType=" + fogType + ", ctx=" + ctx + '}';
 	}
 }

src/main/java/com/jozufozu/flywheel/core/compile/VertexCompiler.java

@@ -12,11 +12,11 @@ import com.jozufozu.flywheel.core.source.SourceFile;
 
 public class VertexCompiler extends Memoizer<VertexCompiler.Context, GlShader> {
 	private final Template<? extends VertexData> template;
-	private final FileResolution header;
+	private final FileResolution contextShader;
 
-	public VertexCompiler(Template<? extends VertexData> template, FileResolution header) {
+	public VertexCompiler(Template<? extends VertexData> template, FileResolution contextShader) {
 		this.template = template;
-		this.header = header;
+		this.contextShader = contextShader;
 	}
 
 	@Override
@@ -26,28 +26,21 @@ public class VertexCompiler extends Memoizer<VertexCompiler.Context, GlShader> {
 		finalSource.append(CompileUtil.generateHeader(template.getVersion(), ShaderType.VERTEX));
 
 		key.ctx.getShaderConstants().writeInto(finalSource);
-
-		finalSource.append("""
-				struct Vertex {
-					vec3 pos;
-					vec4 color;
-					vec2 texCoords;
-					vec2 light;
-					vec3 normal;
-				};
-				""");
-		finalSource.append(key.vertexType.getShaderHeader());
+		finalSource.append('\n');
 
 		FileIndexImpl index = new FileIndexImpl();
 
-		header.getFile().generateFinalSource(index, finalSource);
+		FileResolution layoutShader = key.vertexType.getLayoutShader();
+		layoutShader.getFile().generateFinalSource(index, finalSource);
 
-		key.file.generateFinalSource(index, finalSource);
+		contextShader.getFile().generateFinalSource(index, finalSource);
 
-		VertexData appliedTemplate = template.apply(key.file);
+		key.instanceShader.generateFinalSource(index, finalSource);
+
+		VertexData appliedTemplate = template.apply(key.instanceShader);
 		finalSource.append(appliedTemplate.generateFooter(index, key.vertexType));
 
-		return new GlShader(key.file.name, ShaderType.VERTEX, finalSource.toString());
+		return new GlShader(key.instanceShader.name, ShaderType.VERTEX, finalSource.toString());
 	}
 
 	@Override
@@ -57,24 +50,24 @@ public class VertexCompiler extends Memoizer<VertexCompiler.Context, GlShader> {
 
 	public static class Context {
 		/**
-		 * The file to compile.
+		 * The vertex type to use.
 		 */
-		private final SourceFile file;
+		private final VertexType vertexType;
+
+		/**
+		 * The instance shader source.
+		 */
+		private final SourceFile instanceShader;
 
 		/**
 		 * The shader constants to apply.
 		 */
 		private final StateSnapshot ctx;
 
-		/**
-		 * The vertex type to use.
-		 */
-		private final VertexType vertexType;
-
-		public Context(SourceFile file, StateSnapshot ctx, VertexType vertexType) {
-			this.file = file;
-			this.ctx = ctx;
+		public Context(VertexType vertexType, SourceFile instanceShader, StateSnapshot ctx) {
 			this.vertexType = vertexType;
+			this.instanceShader = instanceShader;
+			this.ctx = ctx;
 		}
 
 		@Override
@@ -82,12 +75,12 @@ public class VertexCompiler extends Memoizer<VertexCompiler.Context, GlShader> {
 			if (this == o) return true;
 			if (o == null || getClass() != o.getClass()) return false;
 			var that = (Context) o;
-			return file == that.file && vertexType == that.vertexType && ctx.equals(that.ctx);
+			return vertexType == that.vertexType && instanceShader == that.instanceShader && ctx.equals(that.ctx);
 		}
 
 		@Override
 		public int hashCode() {
-			return Objects.hash(file, ctx, vertexType);
+			return Objects.hash(vertexType, instanceShader, ctx);
 		}
 	}
 }

src/main/java/com/jozufozu/flywheel/core/crumbling/CrumblingRenderer.java

@@ -14,8 +14,8 @@ import com.jozufozu.flywheel.backend.instancing.SerialTaskEngine;
 import com.jozufozu.flywheel.backend.instancing.instancing.InstancedMaterial;
 import com.jozufozu.flywheel.backend.instancing.instancing.InstancingEngine;
 import com.jozufozu.flywheel.core.Contexts;
-import com.jozufozu.flywheel.core.RenderContext;
 import com.jozufozu.flywheel.core.CoreShaderInfoMap.CoreShaderInfo;
+import com.jozufozu.flywheel.core.RenderContext;
 import com.jozufozu.flywheel.event.ReloadRenderersEvent;
 import com.jozufozu.flywheel.mixin.LevelRendererAccessor;
 import com.jozufozu.flywheel.util.Lazy;
@@ -191,7 +191,7 @@ public class CrumblingRenderer {
 			CoreShaderInfo coreShaderInfo = getCoreShaderInfo();
 
 			for (Map.Entry<Instanced<? extends InstanceData>, InstancedMaterial<?>> entry : materials.entrySet()) {
-				CrumblingProgram program = setup(entry.getKey().getProgramSpec(), coreShaderInfo, camX, camY, camZ, viewProjection, level);
+				CrumblingProgram program = setup(entry.getKey(), coreShaderInfo, camX, camY, camZ, viewProjection, level);
 
 				program.setAtlasSize(width, height);
 

src/main/java/com/jozufozu/flywheel/core/hardcoded/ModelPart.java

@@ -3,8 +3,8 @@ package com.jozufozu.flywheel.core.hardcoded;
 import java.util.List;
 
 import com.jozufozu.flywheel.api.vertex.VertexList;
-import com.jozufozu.flywheel.core.Formats;
 import com.jozufozu.flywheel.core.model.Mesh;
+import com.jozufozu.flywheel.core.vertex.Formats;
 import com.jozufozu.flywheel.core.vertex.PosTexNormalVertex;
 import com.jozufozu.flywheel.core.vertex.PosTexNormalWriterUnsafe;
 import com.mojang.blaze3d.platform.MemoryTracker;

src/main/java/com/jozufozu/flywheel/core/materials/InstanceShaders.java

@@ -0,0 +1,24 @@
+package com.jozufozu.flywheel.core.materials;
+
+import com.jozufozu.flywheel.Flywheel;
+import com.jozufozu.flywheel.core.source.FileResolution;
+import com.jozufozu.flywheel.core.source.Resolver;
+import com.jozufozu.flywheel.event.GatherContextEvent;
+import com.jozufozu.flywheel.util.ResourceUtil;
+
+import net.minecraft.resources.ResourceLocation;
+
+public class InstanceShaders {
+	public static FileResolution MODEL;
+	public static FileResolution ORIENTED;
+
+	public static void flwInit(GatherContextEvent event) {
+		MODEL = Resolver.INSTANCE.get(ResourceUtil.subPath(Names.MODEL, ".vert"));
+		ORIENTED = Resolver.INSTANCE.get(ResourceUtil.subPath(Names.ORIENTED, ".vert"));
+	}
+
+	public static class Names {
+		public static final ResourceLocation MODEL = Flywheel.rl("instance/model");
+		public static final ResourceLocation ORIENTED = Flywheel.rl("instance/oriented");
+	}
+}

src/main/java/com/jozufozu/flywheel/core/materials/Materials.java

@@ -1,22 +1,12 @@
-package com.jozufozu.flywheel.core;
+package com.jozufozu.flywheel.core.materials;
 
-import com.jozufozu.flywheel.Flywheel;
 import com.jozufozu.flywheel.api.struct.StructType;
 import com.jozufozu.flywheel.core.materials.model.ModelData;
 import com.jozufozu.flywheel.core.materials.model.ModelType;
 import com.jozufozu.flywheel.core.materials.oriented.OrientedData;
 import com.jozufozu.flywheel.core.materials.oriented.OrientedType;
 
-import net.minecraft.resources.ResourceLocation;
-
 public class Materials {
-
-	public static final StructType<OrientedData> ORIENTED = new OrientedType();
 	public static final StructType<ModelData> TRANSFORMED = new ModelType();
-
-	public static class Names {
-		public static final ResourceLocation MODEL = Flywheel.rl("model");
-		public static final ResourceLocation ORIENTED = Flywheel.rl("oriented");
-		public static final ResourceLocation PASSTHRU = Flywheel.rl("passthru");
-	}
+	public static final StructType<OrientedData> ORIENTED = new OrientedType();
 }

src/main/java/com/jozufozu/flywheel/core/materials/model/ModelType.java

@@ -4,12 +4,11 @@ import com.jozufozu.flywheel.api.struct.Batched;
 import com.jozufozu.flywheel.api.struct.Instanced;
 import com.jozufozu.flywheel.api.struct.StructWriter;
 import com.jozufozu.flywheel.backend.gl.buffer.VecBuffer;
-import com.jozufozu.flywheel.core.Programs;
 import com.jozufozu.flywheel.core.layout.BufferLayout;
 import com.jozufozu.flywheel.core.layout.CommonItems;
+import com.jozufozu.flywheel.core.materials.InstanceShaders;
 import com.jozufozu.flywheel.core.model.ModelTransformer;
-
-import net.minecraft.resources.ResourceLocation;
+import com.jozufozu.flywheel.core.source.FileResolution;
 
 public class ModelType implements Instanced<ModelData>, Batched<ModelData> {
 
@@ -34,8 +33,8 @@ public class ModelType implements Instanced<ModelData>, Batched<ModelData> {
 	}
 
 	@Override
-	public ResourceLocation getProgramSpec() {
-		return Programs.TRANSFORMED;
+	public FileResolution getInstanceShader() {
+		return InstanceShaders.MODEL;
 	}
 
 	@Override

src/main/java/com/jozufozu/flywheel/core/materials/oriented/OrientedType.java

@@ -4,14 +4,13 @@ import com.jozufozu.flywheel.api.struct.Batched;
 import com.jozufozu.flywheel.api.struct.Instanced;
 import com.jozufozu.flywheel.api.struct.StructWriter;
 import com.jozufozu.flywheel.backend.gl.buffer.VecBuffer;
-import com.jozufozu.flywheel.core.Programs;
 import com.jozufozu.flywheel.core.layout.BufferLayout;
 import com.jozufozu.flywheel.core.layout.CommonItems;
+import com.jozufozu.flywheel.core.materials.InstanceShaders;
 import com.jozufozu.flywheel.core.model.ModelTransformer;
+import com.jozufozu.flywheel.core.source.FileResolution;
 import com.mojang.math.Quaternion;
 
-import net.minecraft.resources.ResourceLocation;
-
 public class OrientedType implements Instanced<OrientedData>, Batched<OrientedData> {
 
 	public static final BufferLayout FORMAT = BufferLayout.builder()
@@ -35,8 +34,8 @@ public class OrientedType implements Instanced<OrientedData>, Batched<OrientedDa
 	}
 
 	@Override
-	public ResourceLocation getProgramSpec() {
-		return Programs.ORIENTED;
+	public FileResolution getInstanceShader() {
+		return InstanceShaders.ORIENTED;
 	}
 
 	@Override

src/main/java/com/jozufozu/flywheel/core/model/BlockMesh.java

@@ -1,8 +1,8 @@
 package com.jozufozu.flywheel.core.model;
 
 import com.jozufozu.flywheel.api.vertex.VertexList;
-import com.jozufozu.flywheel.core.Formats;
 import com.jozufozu.flywheel.core.PartialModel;
+import com.jozufozu.flywheel.core.vertex.Formats;
 import com.mojang.blaze3d.vertex.PoseStack;
 
 import net.minecraft.client.Minecraft;

src/main/java/com/jozufozu/flywheel/core/model/SeparatedWorldModelBuilder.java

@@ -8,7 +8,7 @@ import java.util.Random;
 import java.util.function.Function;
 
 import com.google.common.collect.ImmutableMap;
-import com.jozufozu.flywheel.core.Formats;
+import com.jozufozu.flywheel.core.vertex.Formats;
 import com.jozufozu.flywheel.core.virtual.VirtualEmptyBlockGetter;
 import com.mojang.blaze3d.vertex.BufferBuilder;
 import com.mojang.blaze3d.vertex.DefaultVertexFormat;

src/main/java/com/jozufozu/flywheel/core/shader/ProgramSpec.java

@@ -1,68 +0,0 @@
-package com.jozufozu.flywheel.core.shader;
-
-import com.jozufozu.flywheel.core.source.FileResolution;
-import com.jozufozu.flywheel.core.source.Resolver;
-import com.jozufozu.flywheel.core.source.SourceFile;
-import com.mojang.serialization.Codec;
-import com.mojang.serialization.codecs.RecordCodecBuilder;
-
-import net.minecraft.resources.ResourceLocation;
-
-/**
- * An object describing a shader program that can be loaded by flywheel.
- *
- * <p>
- *     These are defined through json. All ProgramSpecs in {@code assets/modid/flywheel/programs} are parsed and
- *     processed. One ProgramSpec typically specifies one "material" that can be used in game to render things.
- * </p>
- * <p>
- *     All shader source files in {@code assets/modid/flywheel/shaders} are completely loaded and parsed into
- *     {@link SourceFile SourceFiles}, but not compiled until one of them is
- *     referenced by a ProgramSpec.
- * </p>
- */
-public class ProgramSpec {
-
-	public static final Codec<ProgramSpec> CODEC = RecordCodecBuilder.create(instance -> instance.group(
-			ResourceLocation.CODEC.fieldOf("vertex")
-					.forGetter(ProgramSpec::getSourceLoc),
-				ResourceLocation.CODEC.fieldOf("fragment")
-					.forGetter(ProgramSpec::getFragmentLoc))
-			.apply(instance, ProgramSpec::new));
-
-	public ResourceLocation name;
-	public final FileResolution vertex;
-	public final FileResolution fragment;
-
-	public ProgramSpec(ResourceLocation vertex, ResourceLocation fragment) {
-		this.vertex = Resolver.INSTANCE.get(vertex);
-		this.fragment = Resolver.INSTANCE.get(fragment);
-	}
-
-	public void setName(ResourceLocation name) {
-		this.name = name;
-		this.vertex.addSpec(name);
-		this.fragment.addSpec(name);
-	}
-
-	public ResourceLocation getSourceLoc() {
-		return vertex.getFileLoc();
-	}
-
-	public ResourceLocation getFragmentLoc() {
-		return fragment.getFileLoc();
-	}
-
-	public SourceFile getVertexFile() {
-		return vertex.getFile();
-	}
-
-	public SourceFile getFragmentFile() {
-		return fragment.getFile();
-	}
-
-	@Override
-	public String toString() {
-		return name.toString();
-	}
-}

src/main/java/com/jozufozu/flywheel/core/source/FileIndex.java

@@ -11,6 +11,8 @@ public interface FileIndex {
 	 */
 	int getFileID(SourceFile sourceFile);
 
+	boolean exists(SourceFile sourceFile);
+
 	SourceFile getFile(int fileID);
 
 	default Span getLineSpan(int fileId, int lineNo) {

src/main/java/com/jozufozu/flywheel/core/source/FileIndexImpl.java

@@ -31,12 +31,16 @@ public class FileIndexImpl implements FileIndex {
 		return size;
 	}
 
+	@Override
+	public boolean exists(SourceFile sourceFile) {
+		return files.indexOf(sourceFile) != -1;
+	}
+
 	@Override
 	public SourceFile getFile(int fileId) {
 		return files.get(fileId);
 	}
 
-
 	public void printShaderInfoLog(String source, String log, ResourceLocation name) {
 		List<String> lines = log.lines()
 				.toList();

src/main/java/com/jozufozu/flywheel/core/source/FileResolution.java

@@ -93,4 +93,9 @@ public class FileResolution {
 		extraCrashInfoProviders.clear();
 		file = null;
 	}
+
+	@Override
+	public String toString() {
+		return "FileResolution[" + fileLoc + "]";
+	}
 }

src/main/java/com/jozufozu/flywheel/core/source/ShaderSources.java

@@ -53,7 +53,6 @@ public class ShaderSources implements SourceFinder {
 	@Override
 	@Nullable
 	public SourceFile findSource(ResourceLocation name) {
-
 		return shaderSources.get(name);
 	}
 }

src/main/java/com/jozufozu/flywheel/core/source/SourceFile.java

@@ -2,11 +2,12 @@ package com.jozufozu.flywheel.core.source;
 
 import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
+import java.util.Set;
 import java.util.regex.Matcher;
-import java.util.regex.Pattern;
 
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
@@ -27,10 +28,6 @@ import net.minecraft.resources.ResourceLocation;
  * </p>
  */
 public class SourceFile {
-	private static final Pattern includePattern = Pattern.compile("#use \"(.*)\"");
-
-	// https://regexr.com/60n3d
-	public static final Pattern functionDeclaration = Pattern.compile("(\\w+)\\s+(\\w+)\\s*\\(([\\w,\\s]*)\\)\\s*\\{");
 
 	public final ResourceLocation name;
 
@@ -141,15 +138,20 @@ public class SourceFile {
 		for (Import include : imports) {
 			SourceFile file = include.getFile();
 
-			if (file != null) file.generateFinalSource(env, source);
+			if (file != null && !env.exists(file)) {
+				file.generateFinalSource(env, source);
+			}
 		}
 
 		source.append("#line ")
 				.append(0)
 				.append(' ')
 				.append(env.getFileID(this))
+				.append(" // ")
+				.append(name)
 				.append('\n');
 		source.append(elided);
+		source.append('\n');
 	}
 
 	public String printSource() {
@@ -176,7 +178,7 @@ public class SourceFile {
 	 * Scan the source for function definitions and "parse" them into objects that contain properties of the function.
 	 */
 	private ImmutableMap<String, ShaderFunction> parseFunctions() {
-		Matcher matcher = functionDeclaration.matcher(source);
+		Matcher matcher = ShaderFunction.functionDeclaration.matcher(source);
 
 		Map<String, ShaderFunction> functions = new HashMap<>();
 
@@ -210,7 +212,7 @@ public class SourceFile {
 	 * Scan the source for function definitions and "parse" them into objects that contain properties of the function.
 	 */
 	private ImmutableMap<String, ShaderStruct> parseStructs() {
-		Matcher matcher = ShaderStruct.struct.matcher(source);
+		Matcher matcher = ShaderStruct.PATTERN.matcher(source);
 
 		ImmutableMap.Builder<String, ShaderStruct> structs = ImmutableMap.builder();
 		while (matcher.find()) {
@@ -232,15 +234,22 @@ public class SourceFile {
 	 * @param elisions
 	 */
 	private ImmutableList<Import> parseImports(List<Span> elisions) {
-		Matcher uses = includePattern.matcher(source);
+		Matcher uses = Import.PATTERN.matcher(source);
 
+		Set<String> importedFiles = new HashSet<>();
 		List<Import> imports = new ArrayList<>();
 
 		while (uses.find()) {
 			Span use = Span.fromMatcher(this, uses);
 			Span file = Span.fromMatcher(this, uses, 1);
 
-			imports.add(new Import(Resolver.INSTANCE, use, file));
+			String fileName = file.get();
+			if (importedFiles.add(fileName)) {
+				Import import1 = Import.create(Resolver.INSTANCE, use, file);
+				if (import1 != null) {
+					imports.add(import1);
+				}
+			}
 
 			elisions.add(use); // we have to trim that later
 		}

src/main/java/com/jozufozu/flywheel/core/source/error/ErrorReporter.java

@@ -25,7 +25,6 @@ public class ErrorReporter {
 	}
 
 	public static void generateFileError(SourceFile file, String message) {
-
 		String error = ErrorBuilder.error(message)
 				.pointAtFile(file)
 				.build();

src/main/java/com/jozufozu/flywheel/core/source/parse/Import.java

@@ -1,8 +1,7 @@
 package com.jozufozu.flywheel.core.source.parse;
 
-import java.util.ArrayList;
-import java.util.List;
 import java.util.Optional;
+import java.util.regex.Pattern;
 
 import org.jetbrains.annotations.Nullable;
 
@@ -12,34 +11,31 @@ import com.jozufozu.flywheel.core.source.SourceFile;
 import com.jozufozu.flywheel.core.source.error.ErrorReporter;
 import com.jozufozu.flywheel.core.source.span.Span;
 
+import net.minecraft.ResourceLocationException;
 import net.minecraft.resources.ResourceLocation;
 
 public class Import extends AbstractShaderElement {
 
-	public static final List<Import> IMPORTS = new ArrayList<>();
-
-	private final Span file;
+	public static final Pattern PATTERN = Pattern.compile("^\\s*#\\s*use\\s+\"(.*)\"", Pattern.MULTILINE);
 
 	private final FileResolution resolution;
 
-	public Import(Resolver resolver, Span self, Span file) {
+	protected Import(Span self, FileResolution resolution, Span file) {
 		super(self);
-		this.file = file;
-
-		resolution = resolver.get(toRL(file))
-				.addSpan(file);
-
-		IMPORTS.add(this);
+		this.resolution = resolution.addSpan(file);
 	}
 
-	private ResourceLocation toRL(Span file) {
+	@Nullable
+	public static Import create(Resolver resolver, Span self, Span file) {
+		ResourceLocation fileLocation;
 		try {
-			return new ResourceLocation(file.get());
-		} catch (RuntimeException error) {
-			ErrorReporter.generateSpanError(file, "malformed source name");
+			fileLocation = new ResourceLocation(file.get());
+		} catch (ResourceLocationException e) {
+			ErrorReporter.generateSpanError(file, "malformed source location");
+			return null;
 		}
 
-		return new ResourceLocation("");
+		return new Import(self, resolver.get(fileLocation), file);
 	}
 
 	public FileResolution getResolution() {

src/main/java/com/jozufozu/flywheel/core/source/parse/ShaderFunction.java

@@ -9,6 +9,9 @@ import com.jozufozu.flywheel.core.source.span.Span;
 
 public class ShaderFunction extends AbstractShaderElement {
 
+	// https://regexr.com/60n3d
+	public static final Pattern functionDeclaration = Pattern.compile("(\\w+)\\s+(\\w+)\\s*\\(([\\w,\\s]*)\\)\\s*\\{");
+
 	public static final Pattern argument = Pattern.compile("(?:(inout|in|out) )?(\\w+)\\s+(\\w+)");
 	public static final Pattern assignment = Pattern.compile("(\\w+)\\s*=");
 

src/main/java/com/jozufozu/flywheel/core/source/parse/ShaderStruct.java

@@ -10,7 +10,7 @@ import com.jozufozu.flywheel.core.source.span.Span;
 public class ShaderStruct extends AbstractShaderElement {
 
 	// https://regexr.com/61rpe
-	public static final Pattern struct = Pattern.compile("struct\\s+([\\w\\d]*)\\s*\\{([\\w\\d\\s,;]*)}\\s*;\\s");
+	public static final Pattern PATTERN = Pattern.compile("struct\\s+([\\w\\d]*)\\s*\\{([\\w\\d\\s,;]*)}\\s*;\\s");
 
 	public final Span name;
 	public final Span body;

src/main/java/com/jozufozu/flywheel/core/vertex/BlockVertex.java

@@ -7,6 +7,7 @@ import com.jozufozu.flywheel.api.vertex.VertexType;
 import com.jozufozu.flywheel.core.layout.BufferLayout;
 import com.jozufozu.flywheel.core.layout.CommonItems;
 import com.jozufozu.flywheel.core.model.ShadeSeparatedBufferBuilder;
+import com.jozufozu.flywheel.core.source.FileResolution;
 import com.mojang.blaze3d.vertex.BufferBuilder;
 import com.mojang.blaze3d.vertex.DefaultVertexFormat;
 import com.mojang.datafixers.util.Pair;
@@ -38,24 +39,8 @@ public class BlockVertex implements VertexType {
 	}
 
 	@Override
-	public String getShaderHeader() {
-		return """
-layout (location = 0) in vec3 _flw_v_pos;
-layout (location = 1) in vec4 _flw_v_color;
-layout (location = 2) in vec2 _flw_v_texCoords;
-layout (location = 3) in vec2 _flw_v_light;
-layout (location = 4) in vec3 _flw_v_normal;
-
-Vertex FLWCreateVertex() {
-	Vertex v;
-	v.pos = _flw_v_pos;
-	v.color = _flw_v_color;
-	v.texCoords = _flw_v_texCoords;
-	v.light = _flw_v_light;
-	v.normal = _flw_v_normal;
-	return v;
-}
-				""";
+	public FileResolution getLayoutShader() {
+		return LayoutShaders.BLOCK;
 	}
 
 	public BlockVertexListUnsafe.Shaded createReader(ByteBuffer buffer, int vertexCount, int unshadedStartVertex) {

src/main/java/com/jozufozu/flywheel/core/vertex/BlockVertexList.java

@@ -5,7 +5,6 @@ import java.nio.ByteBuffer;
 import com.jozufozu.flywheel.api.vertex.ShadedVertexList;
 import com.jozufozu.flywheel.api.vertex.VertexList;
 import com.jozufozu.flywheel.api.vertex.VertexType;
-import com.jozufozu.flywheel.core.Formats;
 import com.jozufozu.flywheel.core.model.ShadeSeparatedBufferBuilder;
 import com.jozufozu.flywheel.util.RenderMath;
 import com.mojang.blaze3d.vertex.BufferBuilder;

src/main/java/com/jozufozu/flywheel/core/vertex/BlockVertexListUnsafe.java

@@ -7,7 +7,6 @@ import org.lwjgl.system.MemoryUtil;
 import com.jozufozu.flywheel.api.vertex.ShadedVertexList;
 import com.jozufozu.flywheel.api.vertex.VertexList;
 import com.jozufozu.flywheel.api.vertex.VertexType;
-import com.jozufozu.flywheel.core.Formats;
 import com.jozufozu.flywheel.util.RenderMath;
 
 public class BlockVertexListUnsafe implements VertexList {

src/main/java/com/jozufozu/flywheel/core/vertex/Formats.java

@@ -1,10 +1,6 @@
-package com.jozufozu.flywheel.core;
-
-import com.jozufozu.flywheel.core.vertex.BlockVertex;
-import com.jozufozu.flywheel.core.vertex.PosTexNormalVertex;
+package com.jozufozu.flywheel.core.vertex;
 
 public class Formats {
-
-	public static final PosTexNormalVertex POS_TEX_NORMAL = new PosTexNormalVertex();
 	public static final BlockVertex BLOCK = new BlockVertex();
+	public static final PosTexNormalVertex POS_TEX_NORMAL = new PosTexNormalVertex();
 }

src/main/java/com/jozufozu/flywheel/core/vertex/LayoutShaders.java

@@ -0,0 +1,24 @@
+package com.jozufozu.flywheel.core.vertex;
+
+import com.jozufozu.flywheel.Flywheel;
+import com.jozufozu.flywheel.core.source.FileResolution;
+import com.jozufozu.flywheel.core.source.Resolver;
+import com.jozufozu.flywheel.event.GatherContextEvent;
+import com.jozufozu.flywheel.util.ResourceUtil;
+
+import net.minecraft.resources.ResourceLocation;
+
+public class LayoutShaders {
+	public static FileResolution BLOCK;
+	public static FileResolution POS_TEX_NORMAL;
+
+	public static void flwInit(GatherContextEvent event) {
+		BLOCK = Resolver.INSTANCE.get(ResourceUtil.subPath(Names.BLOCK, ".vert"));
+		POS_TEX_NORMAL = Resolver.INSTANCE.get(ResourceUtil.subPath(Names.POS_TEX_NORMAL, ".vert"));
+	}
+
+	public static class Names {
+		public static final ResourceLocation BLOCK = Flywheel.rl("layout/block");
+		public static final ResourceLocation POS_TEX_NORMAL = Flywheel.rl("layout/pos_tex_normal");
+	}
+}

src/main/java/com/jozufozu/flywheel/core/vertex/PosTexNormalVertex.java

@@ -5,6 +5,7 @@ import java.nio.ByteBuffer;
 import com.jozufozu.flywheel.api.vertex.VertexType;
 import com.jozufozu.flywheel.core.layout.BufferLayout;
 import com.jozufozu.flywheel.core.layout.CommonItems;
+import com.jozufozu.flywheel.core.source.FileResolution;
 
 public class PosTexNormalVertex implements VertexType {
 
@@ -28,21 +29,7 @@ public class PosTexNormalVertex implements VertexType {
 	}
 
 	@Override
-	public String getShaderHeader() {
-		return """
-layout (location = 0) in vec3 _flw_v_pos;
-layout (location = 1) in vec2 _flw_v_texCoords;
-layout (location = 2) in vec3 _flw_v_normal;
-
-Vertex FLWCreateVertex() {
-	Vertex v;
-	v.pos = _flw_v_pos;
-	v.color = vec4(1.);
-	v.texCoords = _flw_v_texCoords;
-	v.light = vec2(0.);
-	v.normal = _flw_v_normal;
-	return v;
-}
-				""";
+	public FileResolution getLayoutShader() {
+		return LayoutShaders.POS_TEX_NORMAL;
 	}
 }

src/main/java/com/jozufozu/flywheel/core/vertex/PosTexNormalVertexListUnsafe.java

@@ -6,7 +6,6 @@ import org.lwjgl.system.MemoryUtil;
 
 import com.jozufozu.flywheel.api.vertex.VertexList;
 import com.jozufozu.flywheel.api.vertex.VertexType;
-import com.jozufozu.flywheel.core.Formats;
 import com.jozufozu.flywheel.util.RenderMath;
 
 public class PosTexNormalVertexListUnsafe implements VertexList {

src/main/java/com/jozufozu/flywheel/vanilla/BellInstance.java

@@ -6,8 +6,8 @@ import com.jozufozu.flywheel.api.MaterialManager;
 import com.jozufozu.flywheel.api.instance.DynamicInstance;
 import com.jozufozu.flywheel.backend.instancing.blockentity.BlockEntityInstance;
 import com.jozufozu.flywheel.core.BasicModelSupplier;
-import com.jozufozu.flywheel.core.Materials;
 import com.jozufozu.flywheel.core.hardcoded.ModelPart;
+import com.jozufozu.flywheel.core.materials.Materials;
 import com.jozufozu.flywheel.core.materials.oriented.OrientedData;
 import com.jozufozu.flywheel.util.AnimationTickHolder;
 import com.mojang.math.Quaternion;

src/main/java/com/jozufozu/flywheel/vanilla/ChestInstance.java

@@ -9,8 +9,8 @@ import com.jozufozu.flywheel.api.MaterialManager;
 import com.jozufozu.flywheel.api.instance.DynamicInstance;
 import com.jozufozu.flywheel.backend.instancing.blockentity.BlockEntityInstance;
 import com.jozufozu.flywheel.core.BasicModelSupplier;
-import com.jozufozu.flywheel.core.Materials;
 import com.jozufozu.flywheel.core.hardcoded.ModelPart;
+import com.jozufozu.flywheel.core.materials.Materials;
 import com.jozufozu.flywheel.core.materials.model.ModelData;
 import com.jozufozu.flywheel.core.materials.oriented.OrientedData;
 import com.jozufozu.flywheel.util.AnimationTickHolder;

src/main/java/com/jozufozu/flywheel/vanilla/MinecartInstance.java

@@ -7,9 +7,9 @@ import com.jozufozu.flywheel.api.instance.DynamicInstance;
 import com.jozufozu.flywheel.api.instance.TickableInstance;
 import com.jozufozu.flywheel.backend.instancing.entity.EntityInstance;
 import com.jozufozu.flywheel.core.BasicModelSupplier;
-import com.jozufozu.flywheel.core.Materials;
 import com.jozufozu.flywheel.core.Models;
 import com.jozufozu.flywheel.core.hardcoded.ModelPart;
+import com.jozufozu.flywheel.core.materials.Materials;
 import com.jozufozu.flywheel.core.materials.model.ModelData;
 import com.jozufozu.flywheel.core.model.Mesh;
 import com.jozufozu.flywheel.util.AnimationTickHolder;

src/main/java/com/jozufozu/flywheel/vanilla/ShulkerBoxInstance.java

@@ -6,8 +6,8 @@ import com.jozufozu.flywheel.api.MaterialManager;
 import com.jozufozu.flywheel.api.instance.DynamicInstance;
 import com.jozufozu.flywheel.backend.instancing.blockentity.BlockEntityInstance;
 import com.jozufozu.flywheel.core.BasicModelSupplier;
-import com.jozufozu.flywheel.core.Materials;
 import com.jozufozu.flywheel.core.hardcoded.ModelPart;
+import com.jozufozu.flywheel.core.materials.Materials;
 import com.jozufozu.flywheel.core.materials.model.ModelData;
 import com.jozufozu.flywheel.util.AnimationTickHolder;
 import com.jozufozu.flywheel.util.transform.TransformStack;

src/main/resources/assets/flywheel/flywheel/programs/model.json

@@ -1,4 +0,0 @@
-{
-  "vertex": "flywheel:model.vert",
-  "fragment": "flywheel:block.frag"
-}

src/main/resources/assets/flywheel/flywheel/programs/oriented.json

@@ -1,4 +0,0 @@
-{
-  "vertex": "flywheel:oriented.vert",
-  "fragment": "flywheel:block.frag"
-}

src/main/resources/assets/flywheel/flywheel/programs/passthru.json

@@ -1,4 +0,0 @@
-{
-  "vertex": "flywheel:passthru.vert",
-  "fragment": "flywheel:block.frag"
-}

src/main/resources/assets/flywheel/flywheel/shaders/api/fragment.glsl

@@ -0,0 +1,12 @@
+in vec4 flw_vertexPos;
+in vec4 flw_vertexColor;
+in vec2 flw_vertexTexCoord;
+in vec2 flw_vertexLight;
+in vec3 flw_vertexNormal;
+
+in float flw_distance;
+
+in vec4 flw_var0;
+in vec4 flw_var1;
+in vec4 flw_var2;
+in vec4 flw_var3;

src/main/resources/assets/flywheel/flywheel/shaders/api/vertex.glsl

@@ -0,0 +1,12 @@
+out vec4 flw_vertexPos;
+out vec4 flw_vertexColor;
+out vec2 flw_vertexTexCoord;
+out vec2 flw_vertexLight;
+out vec3 flw_vertexNormal;
+
+out float flw_distance;
+
+out vec4 flw_var0;
+out vec4 flw_var1;
+out vec4 flw_var2;
+out vec4 flw_var3;

src/main/resources/assets/flywheel/flywheel/shaders/block.frag

@@ -1,13 +0,0 @@
-
-struct Fragment {
-    vec2 texCoords;
-    vec4 color;
-    float diffuse;
-    vec2 light;
-};
-
-vec4 fragment(Fragment r) {
-    vec4 tex = FLWBlockTexture(r.texCoords);
-
-    return vec4(tex.rgb * FLWLight(r.light).rgb * r.diffuse, tex.a) * r.color;
-}

src/main/resources/assets/flywheel/flywheel/shaders/context/common.vert

@@ -0,0 +1,26 @@
+#use "flywheel:api/vertex.glsl"
+#use "flywheel:util/diffuse.glsl"
+#use "flywheel:util/fog.glsl"
+
+uniform mat4 uViewProjection;
+uniform vec3 uCameraPos;
+uniform int uConstantAmbientLight;
+uniform int uFogShape;
+
+out float _flw_diffuse;
+
+void flw_contextVertex() {
+    flw_vertexNormal = normalize(flw_vertexNormal);
+    if (uConstantAmbientLight == 1) {
+        _flw_diffuse = diffuseNether(flw_vertexNormal);
+    } else {
+        _flw_diffuse = diffuse(flw_vertexNormal);
+    }
+    flw_distance = fog_distance(flw_vertexPos.xyz, uCameraPos, uFogShape);
+    gl_Position = uViewProjection * flw_vertexPos;
+
+    // TODO: remove this
+    #ifdef DEBUG_NORMAL
+    flw_vertexColor = vec4(flw_vertexNormal, 1.0);
+    #endif
+}

src/main/resources/assets/flywheel/flywheel/shaders/context/crumbling.frag

@@ -0,0 +1,34 @@
+#use "flywheel:api/fragment.glsl"
+#use "flywheel:util/fog.glsl"
+
+uniform vec2 uFogRange;
+uniform vec4 uFogColor;
+uniform vec2 uTextureScale;
+
+uniform sampler2D uBlockAtlas;
+uniform sampler2D uCrumbling;
+
+in float _flw_diffuse;
+
+out vec4 fragColor;
+
+void flw_contextFragment() {
+    vec4 texColor = texture(uBlockAtlas, flw_vertexTexCoord);
+    vec4 crumblingColor = texture(uCrumbling, flw_vertexTexCoord * uTextureScale);
+    crumblingColor.a *= texColor.a;
+    vec4 color = flw_vertexColor * vec4(crumblingColor.rgb * _flw_diffuse, crumblingColor.a);
+
+    #ifdef ALPHA_DISCARD
+    if (color.a < ALPHA_DISCARD) {
+        discard;
+    }
+    #endif
+
+    #ifdef COLOR_FOG
+    color = linear_fog(color, flw_distance, uFogRange.x, uFogRange.y, uFogColor);
+    #elif defined(FADE_FOG)
+    color = linear_fog_fade(color, flw_distance, uFogRange.x, uFogRange.y);
+    #endif
+
+    fragColor = color;
+}

src/main/resources/assets/flywheel/flywheel/shaders/context/crumbling.glsl

@@ -1,64 +0,0 @@
-#use "flywheel:context/fog.glsl"
-
-uniform float uTime;
-uniform mat4 uViewProjection;
-uniform vec3 uCameraPos;
-uniform int uConstantAmbientLight;
-
-uniform vec2 uTextureScale;
-uniform sampler2D uBlockAtlas;
-uniform sampler2D uLightMap;
-uniform sampler2D uCrumbling;
-
-uniform vec2 uWindowSize;
-
-#ifdef VERTEX_SHADER
-
-#use "flywheel:context/diffuse.glsl"
-
-vec4 FLWVertex(inout Vertex v) {
-    fragDistance = fog_distance(v.pos, uCameraPos);
-
-    return uViewProjection * vec4(v.pos, 1.);
-}
-
-float FLWDiffuse(vec3 normal) {
-    if (uConstantAmbientLight == 1) {
-        return diffuseNether(normal);
-    } else {
-        return diffuse(normal);
-    }
-}
-
-#elif defined(FRAGMENT_SHADER)
-
-out vec4 fragColor;
-
-vec4 FLWBlockTexture(vec2 texCoords) {
-    vec4 cr = texture(uCrumbling, texCoords * uTextureScale);
-    float diffuseAlpha = texture(uBlockAtlas, texCoords).a;
-    cr.a = cr.a * diffuseAlpha;
-    return cr;
-}
-
-vec4 FLWLight(vec2 lightCoords) {
-    return vec4(1.);
-}
-
-void FLWFinalizeColor(vec4 color) {
-    #ifdef ALPHA_DISCARD
-    if (color.a < ALPHA_DISCARD) {
-        discard;
-    }
-    #endif
-
-    #ifdef COLOR_FOG
-    color = linear_fog(color);
-    #elif defined(FADE_FOG)
-    color = linear_fog_fade(color);
-    #endif
-
-    fragColor = color;
-}
-
-#endif

src/main/resources/assets/flywheel/flywheel/shaders/context/crumbling.vert

@@ -0,0 +1 @@
+#use "flywheel:context/common.vert"

src/main/resources/assets/flywheel/flywheel/shaders/context/fog.glsl

@@ -1,50 +0,0 @@
-uniform vec4 uFogColor;
-uniform vec2 uFogRange;
-uniform int uFogShape;
-
-#ifdef VERTEX_SHADER
-out float fragDistance;
-#elif defined(FRAGMENT_SHADER)
-in float fragDistance;
-#endif
-
-float spherical_distance(vec3 relativePos) {
-    return length(relativePos);
-}
-
-float cylindrical_distance(vec3 relativePos) {
-    float distXZ = length(relativePos.xz);
-    float distY = abs(relativePos.y);
-    return max(distXZ, distY);
-}
-
-float fog_distance(vec3 relativePos) {
-    if (uFogShape == 0) {
-        return spherical_distance(relativePos);
-    } else {
-        return cylindrical_distance(relativePos);
-    }
-}
-
-float fog_distance(vec3 worldPos, vec3 cameraPos) {
-    return fog_distance(worldPos - cameraPos);
-}
-
-vec4 linear_fog(vec4 color) {
-    if (fragDistance <= uFogRange.x) {
-        return color;
-    }
-
-    float fogValue = fragDistance < uFogRange.y ? smoothstep(uFogRange.x, uFogRange.y, fragDistance) : 1.0;
-    return vec4(mix(color.rgb, uFogColor.rgb, fogValue * uFogColor.a), color.a);
-}
-
-vec4 linear_fog_fade(vec4 color) {
-    if (fragDistance <= uFogRange.x) {
-        return color;
-    } else if (fragDistance >= uFogRange.y) {
-        return vec4(0.0);
-    }
-
-    return color * smoothstep(uFogRange.y, uFogRange.x, fragDistance);
-}

src/main/resources/assets/flywheel/flywheel/shaders/context/world.frag

@@ -0,0 +1,39 @@
+#use "flywheel:api/fragment.glsl"
+#use "flywheel:util/fog.glsl"
+
+// optimize discard usage
+#ifdef ALPHA_DISCARD
+#ifdef GL_ARB_conservative_depth
+layout (depth_greater) out float gl_FragDepth;
+#endif
+#endif
+
+uniform vec2 uFogRange;
+uniform vec4 uFogColor;
+
+uniform sampler2D uBlockAtlas;
+uniform sampler2D uLightMap;
+
+in float _flw_diffuse;
+
+out vec4 fragColor;
+
+void flw_contextFragment() {
+    vec4 texColor = texture(uBlockAtlas, flw_vertexTexCoord);
+    vec4 lightColor = texture(uLightMap, flw_vertexLight);
+    vec4 color = flw_vertexColor * vec4(texColor.rgb * lightColor.rgb * _flw_diffuse, texColor.a);
+
+    #ifdef ALPHA_DISCARD
+    if (color.a < ALPHA_DISCARD) {
+        discard;
+    }
+    #endif
+
+    #ifdef COLOR_FOG
+    color = linear_fog(color, flw_distance, uFogRange.x, uFogRange.y, uFogColor);
+    #elif defined(FADE_FOG)
+    color = linear_fog_fade(color, flw_distance, uFogRange.x, uFogRange.y);
+    #endif
+
+    fragColor = color;
+}

src/main/resources/assets/flywheel/flywheel/shaders/context/world.glsl

@@ -1,68 +0,0 @@
-#use "flywheel:context/fog.glsl"
-
-uniform float uTime;
-uniform mat4 uViewProjection;
-uniform vec3 uCameraPos;
-uniform int uConstantAmbientLight;
-
-uniform vec2 uTextureScale;
-uniform sampler2D uBlockAtlas;
-uniform sampler2D uLightMap;
-
-uniform vec2 uWindowSize;
-
-#ifdef VERTEX_SHADER
-
-#use "flywheel:context/diffuse.glsl"
-
-vec4 FLWVertex(inout Vertex v) {
-    fragDistance = fog_distance(v.pos, uCameraPos);
-
-    return uViewProjection * vec4(v.pos, 1.);
-}
-
-float FLWDiffuse(vec3 normal) {
-    if (uConstantAmbientLight == 1) {
-        return diffuseNether(normal);
-    } else {
-        return diffuse(normal);
-    }
-}
-
-#elif defined(FRAGMENT_SHADER)
-
-#use "flywheel:core/lightutil.glsl"
-
-// optimize discard usage
-#ifdef ALPHA_DISCARD
-#ifdef GL_ARB_conservative_depth
-layout (depth_greater) out float gl_FragDepth;
-#endif
-#endif
-out vec4 fragColor;
-
-vec4 FLWBlockTexture(vec2 texCoords) {
-    return texture(uBlockAtlas, texCoords);
-}
-
-vec4 FLWLight(vec2 lightCoords) {
-    return texture(uLightMap, shiftLight(lightCoords));
-}
-
-void FLWFinalizeColor(vec4 color) {
-    #ifdef ALPHA_DISCARD
-    if (color.a < ALPHA_DISCARD) {
-        discard;
-    }
-    #endif
-
-    #ifdef COLOR_FOG
-    color = linear_fog(color);
-    #elif defined(FADE_FOG)
-    color = linear_fog_fade(color);
-    #endif
-
-    fragColor = color;
-}
-
-#endif

src/main/resources/assets/flywheel/flywheel/shaders/context/world.vert

@@ -0,0 +1 @@
+#use "flywheel:context/common.vert"

src/main/resources/assets/flywheel/flywheel/shaders/instance/model.vert

@@ -0,0 +1,16 @@
+#use "flywheel:api/vertex.glsl"
+#use "flywheel:util/light.glsl"
+
+struct Instance {
+    vec2 light;
+    vec4 color;
+    mat4 transform;
+    mat3 normalMat;
+};
+
+void flw_instanceVertex(Instance instance) {
+    flw_vertexPos = instance.transform * flw_vertexPos;
+    flw_vertexNormal = instance.normalMat * flw_vertexNormal;
+    flw_vertexColor = instance.color;
+    flw_vertexLight = shiftLight(instance.light);
+}

src/main/resources/assets/flywheel/flywheel/shaders/instance/oriented.vert

@@ -0,0 +1,18 @@
+#use "flywheel:api/vertex.glsl"
+#use "flywheel:util/light.glsl"
+#use "flywheel:util/quaternion.glsl"
+
+struct Oriented {
+    vec2 light;
+    vec4 color;
+    vec3 pos;
+    vec3 pivot;
+    vec4 rotation;
+};
+
+void flw_instanceVertex(Oriented oriented) {
+    flw_vertexPos = vec4(rotateVertexByQuat(flw_vertexPos.xyz - oriented.pivot, oriented.rotation) + oriented.pivot + oriented.pos, 1.0);
+    flw_vertexNormal = rotateVertexByQuat(flw_vertexNormal, oriented.rotation);
+    flw_vertexColor = oriented.color;
+    flw_vertexLight = shiftLight(oriented.light);
+}

src/main/resources/assets/flywheel/flywheel/shaders/layout/block.vert

@@ -0,0 +1,16 @@
+#use "flywheel:api/vertex.glsl"
+#use "flywheel:util/light.glsl"
+
+layout(location = 0) in vec3 _flw_v_pos;
+layout(location = 1) in vec4 _flw_v_color;
+layout(location = 2) in vec2 _flw_v_texCoord;
+layout(location = 3) in vec2 _flw_v_light;
+layout(location = 4) in vec3 _flw_v_normal;
+
+void flw_layoutVertex() {
+    flw_vertexPos = vec4(_flw_v_pos, 1.0);
+    flw_vertexColor = _flw_v_color;
+    flw_vertexTexCoord = _flw_v_texCoord;
+    flw_vertexLight = shiftLight(_flw_v_light);
+    flw_vertexNormal = _flw_v_normal;
+}

src/main/resources/assets/flywheel/flywheel/shaders/layout/pos_tex_normal.vert

@@ -0,0 +1,13 @@
+#use "flywheel:api/vertex.glsl"
+
+layout(location = 0) in vec3 _flw_v_pos;
+layout(location = 1) in vec2 _flw_v_texCoord;
+layout(location = 2) in vec3 _flw_v_normal;
+
+void flw_layoutVertex() {
+    flw_vertexPos = vec4(_flw_v_pos, 1.0);
+    flw_vertexColor = vec4(1.0);
+    flw_vertexTexCoord = _flw_v_texCoord;
+    flw_vertexLight = vec2(0.0);
+    flw_vertexNormal = _flw_v_normal;
+}

src/main/resources/assets/flywheel/flywheel/shaders/model.vert

@@ -1,14 +0,0 @@
-
-struct Instance {
-    vec2 light;
-    vec4 color;
-    mat4 transform;
-    mat3 normalMat;
-};
-
-void vertex(inout Vertex v, Instance i) {
-    v.pos = (i.transform * vec4(v.pos, 1.)).xyz;
-    v.normal = i.normalMat * v.normal;
-    v.color = i.color;
-    v.light = i.light;
-}

src/main/resources/assets/flywheel/flywheel/shaders/oriented.vert

@@ -1,16 +0,0 @@
-#use "flywheel:core/quaternion.glsl"
-
-struct Oriented {
-    vec2 light;
-    vec4 color;
-    vec3 pos;
-    vec3 pivot;
-    vec4 rotation;
-};
-
-void vertex(inout Vertex v, Oriented o) {
-    v.pos = rotateVertexByQuat(v.pos - o.pivot, o.rotation) + o.pivot + o.pos;
-    v.normal = rotateVertexByQuat(v.normal, o.rotation);
-    v.color = o.color;
-    v.light = o.light;
-}

src/main/resources/assets/flywheel/flywheel/shaders/passthru.vert

@@ -1,4 +0,0 @@
-
-void vertex(inout Vertex v) {
-
-}

src/main/resources/assets/flywheel/flywheel/shaders/util/fog.glsl

@@ -0,0 +1,40 @@
+float spherical_distance(vec3 relativePos) {
+    return length(relativePos);
+}
+
+float cylindrical_distance(vec3 relativePos) {
+    float distXZ = length(relativePos.xz);
+    float distY = abs(relativePos.y);
+    return max(distXZ, distY);
+}
+
+float fog_distance(vec3 relativePos, int fogShape) {
+    if (fogShape == 0) {
+        return spherical_distance(relativePos);
+    } else {
+        return cylindrical_distance(relativePos);
+    }
+}
+
+float fog_distance(vec3 worldPos, vec3 cameraPos, int fogShape) {
+    return fog_distance(worldPos - cameraPos, fogShape);
+}
+
+vec4 linear_fog(vec4 color, float distance, float fogStart, float fogEnd, vec4 fogColor) {
+    if (distance <= fogStart) {
+        return color;
+    }
+
+    float fogValue = distance < fogEnd ? smoothstep(fogStart, fogEnd, distance) : 1.0;
+    return vec4(mix(color.rgb, fogColor.rgb, fogValue * fogColor.a), color.a);
+}
+
+vec4 linear_fog_fade(vec4 color, float distance, float fogStart, float fogEnd) {
+    if (distance <= fogStart) {
+        return color;
+    } else if (distance >= fogEnd) {
+        return vec4(0.0);
+    }
+
+    return color * smoothstep(fogEnd, fogStart, distance);
+}