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

@@ -19,7 +19,8 @@ public final class InternalVertex {
 			.vector("position", FloatRepr.FLOAT, 3)
 			.vector("color", FloatRepr.NORMALIZED_UNSIGNED_BYTE, 4)
 			.vector("tex", FloatRepr.FLOAT, 2)
-			.vector("overlay_light", UnsignedIntegerRepr.UNSIGNED_SHORT, 4)
+			.vector("overlay", UnsignedIntegerRepr.UNSIGNED_SHORT, 2)
+			.vector("light", UnsignedIntegerRepr.UNSIGNED_SHORT, 2)
 			.vector("normal", FloatRepr.NORMALIZED_BYTE, 3)
 			.build();
 

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

@@ -2,7 +2,6 @@ package com.jozufozu.flywheel.backend.compile;
 
 import java.util.List;
 
-import org.jetbrains.annotations.Nullable;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -23,37 +22,26 @@ import net.minecraft.server.packs.resources.ResourceManager;
 import net.minecraft.server.packs.resources.ResourceManagerReloadListener;
 
 public final class FlwPrograms {
-	public static final Logger LOGGER = LoggerFactory.getLogger(Flywheel.ID + "/shaders");
+	public static final Logger LOGGER = LoggerFactory.getLogger(Flywheel.ID + "/compile");
 
 	private FlwPrograms() {
 	}
 
 	private static void reload(ResourceManager resourceManager) {
-		// Reset the programs in case the ubershader load fails.
-		InstancingPrograms.setInstance(null);
-		IndirectPrograms.setInstance(null);
-
 		var sources = new ShaderSources(resourceManager);
-		var stats = new CompilerStats("ubershaders");
-		var loadChecker = new SourceLoader(sources, stats);
-
-		var vertexMaterialComponent = createVertexMaterialComponent(loadChecker);
-		var fragmentMaterialComponent = createFragmentMaterialComponent(loadChecker);
-		var fogComponent = createFogComponent(loadChecker);
-		var cutoutComponent = createCutoutComponent(loadChecker);
-
-		if (stats.errored() || vertexMaterialComponent == null || fragmentMaterialComponent == null || fogComponent == null || cutoutComponent == null) {
-			// Probably means the shader sources are missing.
-			stats.emitErrorLog();
-			return;
-		}
-
-		List<SourceComponent> vertexComponents = List.of(vertexMaterialComponent);
-		List<SourceComponent> fragmentComponents = List.of(fragmentMaterialComponent, fogComponent, cutoutComponent);
+		var preLoadStats = new CompilerStats("Preload");
+		var loadChecker = new SourceLoader(sources, preLoadStats);
 
 		var pipelineKeys = createPipelineKeys();
+		List<SourceComponent> vertexComponents = List.of(createVertexMaterialComponent(loadChecker));
+		List<SourceComponent> fragmentComponents = List.of(createFragmentMaterialComponent(loadChecker), createFogComponent(loadChecker), createCutoutComponent(loadChecker));
+
 		InstancingPrograms.reload(sources, pipelineKeys, vertexComponents, fragmentComponents);
 		IndirectPrograms.reload(sources, pipelineKeys, vertexComponents, fragmentComponents);
+
+		if (preLoadStats.errored()) {
+			preLoadStats.emitErrorLog();
+		}
 	}
 
 	private static ImmutableList<PipelineProgramKey> createPipelineKeys() {
@@ -66,7 +54,6 @@ public final class FlwPrograms {
 		return builder.build();
 	}
 
-	@Nullable
 	private static UberShaderComponent createVertexMaterialComponent(SourceLoader loadChecker) {
 		return UberShaderComponent.builder(Flywheel.rl("uber_material_vertex"))
 				.materialSources(ShaderIndices.materialVertex()
@@ -76,7 +63,6 @@ public final class FlwPrograms {
 				.build(loadChecker);
 	}
 
-	@Nullable
 	private static UberShaderComponent createFragmentMaterialComponent(SourceLoader loadChecker) {
 		return UberShaderComponent.builder(Flywheel.rl("uber_material_fragment"))
 				.materialSources(ShaderIndices.materialFragment()
@@ -86,7 +72,6 @@ public final class FlwPrograms {
 				.build(loadChecker);
 	}
 
-	@Nullable
 	private static UberShaderComponent createFogComponent(SourceLoader loadChecker) {
 		return UberShaderComponent.builder(Flywheel.rl("uber_fog"))
 				.materialSources(ShaderIndices.fog()
@@ -100,7 +85,6 @@ public final class FlwPrograms {
 				.build(loadChecker);
 	}
 
-	@Nullable
 	private static UberShaderComponent createCutoutComponent(SourceLoader loadChecker) {
 		return UberShaderComponent.builder(Flywheel.rl("uber_cutout"))
 				.materialSources(ShaderIndices.cutout()

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

@@ -3,7 +3,6 @@ package com.jozufozu.flywheel.backend.compile;
 import java.util.List;
 import java.util.Map;
 
-import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.Nullable;
 
 import com.google.common.collect.ImmutableList;
@@ -103,8 +102,7 @@ public class IndirectPrograms extends AbstractPrograms {
 		return builder.build();
 	}
 
-	@ApiStatus.Internal
-	public static void setInstance(@Nullable IndirectPrograms newInstance) {
+	private static void setInstance(@Nullable IndirectPrograms newInstance) {
 		if (instance != null) {
 			instance.release();
 		}

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

@@ -3,7 +3,6 @@ package com.jozufozu.flywheel.backend.compile;
 import java.util.List;
 import java.util.Map;
 
-import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.Nullable;
 
 import com.google.common.collect.ImmutableList;
@@ -43,8 +42,7 @@ public class InstancingPrograms extends AbstractPrograms {
 		setInstance(newInstance);
 	}
 
-	@ApiStatus.Internal
-	public static void setInstance(@Nullable InstancingPrograms newInstance) {
+	private static void setInstance(@Nullable InstancingPrograms newInstance) {
 		if (instance != null) {
 			instance.release();
 		}

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

@@ -108,7 +108,6 @@ public class UberShaderComponent implements SourceComponent {
 		private final ResourceLocation name;
 		private final List<ResourceLocation> materialSources = new ArrayList<>();
 		private final List<AdaptedFn> adaptedFunctions = new ArrayList<>();
-		@Nullable
 		private GlslExpr switchArg;
 
 		public Builder(ResourceLocation name) {
@@ -135,7 +134,6 @@ public class UberShaderComponent implements SourceComponent {
 			return this;
 		}
 
-		@Nullable
 		public UberShaderComponent build(SourceLoader sources) {
 			if (switchArg == null) {
 				throw new NullPointerException("Switch argument must be set");

src/main/java/com/jozufozu/flywheel/lib/instance/InstanceTypes.java

@@ -14,7 +14,8 @@ public final class InstanceTypes {
 	public static final InstanceType<TransformedInstance> TRANSFORMED = SimpleInstanceType.builder(TransformedInstance::new)
 			.layout(LayoutBuilder.create()
 					.vector("color", FloatRepr.NORMALIZED_UNSIGNED_BYTE, 4)
-					.vector("overlay_light", IntegerRepr.SHORT, 4)
+					.vector("light", IntegerRepr.SHORT, 2)
+					.vector("overlay", IntegerRepr.SHORT, 2)
 					.matrix("pose", FloatRepr.FLOAT, 4)
 					.matrix("normal", FloatRepr.FLOAT, 3)
 					.build())
@@ -23,9 +24,9 @@ public final class InstanceTypes {
 				MemoryUtil.memPutByte(ptr + 1, instance.g);
 				MemoryUtil.memPutByte(ptr + 2, instance.b);
 				MemoryUtil.memPutByte(ptr + 3, instance.a);
-				MemoryUtil.memPutInt(ptr + 4, instance.overlay);
-				MemoryUtil.memPutShort(ptr + 8, instance.blockLight);
-				MemoryUtil.memPutShort(ptr + 10, instance.skyLight);
+				MemoryUtil.memPutShort(ptr + 4, instance.blockLight);
+				MemoryUtil.memPutShort(ptr + 6, instance.skyLight);
+				MemoryUtil.memPutInt(ptr + 8, instance.overlay);
 				MatrixMath.writeUnsafe(instance.model, ptr + 12);
 				MatrixMath.writeUnsafe(instance.normal, ptr + 76);
 			})
@@ -36,7 +37,8 @@ public final class InstanceTypes {
 	public static final InstanceType<OrientedInstance> ORIENTED = SimpleInstanceType.builder(OrientedInstance::new)
 			.layout(LayoutBuilder.create()
 					.vector("color", FloatRepr.NORMALIZED_UNSIGNED_BYTE, 4)
-					.vector("overlay_light", IntegerRepr.SHORT, 4)
+					.vector("light", IntegerRepr.SHORT, 2)
+					.vector("overlay", IntegerRepr.SHORT, 2)
 					.vector("position", FloatRepr.FLOAT, 3)
 					.vector("pivot", FloatRepr.FLOAT, 3)
 					.vector("rotation", FloatRepr.FLOAT, 4)
@@ -46,9 +48,9 @@ public final class InstanceTypes {
 				MemoryUtil.memPutByte(ptr + 1, instance.g);
 				MemoryUtil.memPutByte(ptr + 2, instance.b);
 				MemoryUtil.memPutByte(ptr + 3, instance.a);
-				MemoryUtil.memPutInt(ptr + 4, instance.overlay);
-				MemoryUtil.memPutShort(ptr + 8, instance.blockLight);
-				MemoryUtil.memPutShort(ptr + 10, instance.skyLight);
+				MemoryUtil.memPutShort(ptr + 4, instance.blockLight);
+				MemoryUtil.memPutShort(ptr + 6, instance.skyLight);
+				MemoryUtil.memPutInt(ptr + 8, instance.overlay);
 				MemoryUtil.memPutFloat(ptr + 12, instance.posX);
 				MemoryUtil.memPutFloat(ptr + 16, instance.posY);
 				MemoryUtil.memPutFloat(ptr + 20, instance.posZ);

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

@@ -4,6 +4,6 @@ void flw_instanceVertex(in FlwInstance i) {
     flw_vertexPos = vec4(rotateByQuaternion(flw_vertexPos.xyz - i.pivot, i.rotation) + i.pivot + i.position, 1.0);
     flw_vertexNormal = rotateByQuaternion(flw_vertexNormal, i.rotation);
     flw_vertexColor = i.color;
-    flw_vertexOverlay = i.overlay_light.xy;
-    flw_vertexLight = i.overlay_light.zw / 15.0;
+    flw_vertexOverlay = i.overlay;
+    flw_vertexLight = i.light / 15.0;
 }

src/main/resources/assets/flywheel/flywheel/instance/transformed.vert

@@ -2,6 +2,6 @@ void flw_instanceVertex(in FlwInstance i) {
     flw_vertexPos = i.pose * flw_vertexPos;
     flw_vertexNormal = i.normal * flw_vertexNormal;
     flw_vertexColor = i.color;
-    flw_vertexOverlay = i.overlay_light.xy;
-    flw_vertexLight = i.overlay_light.zw / 15.0;
+    flw_vertexOverlay = i.overlay;
+    flw_vertexLight = i.light / 15.0;
 }

src/main/resources/assets/flywheel/flywheel/internal/vertex_input.vert

@@ -1,14 +1,15 @@
 layout(location = 0) in vec3 _flw_a_pos;
 layout(location = 1) in vec4 _flw_a_color;
 layout(location = 2) in vec2 _flw_a_texCoord;
-layout(location = 3) in ivec4 _flw_a_overlay_light;
-layout(location = 4) in vec3 _flw_a_normal;
+layout(location = 3) in ivec2 _flw_a_overlay;
+layout(location = 4) in ivec2 _flw_a_light;
+layout(location = 5) in vec3 _flw_a_normal;
 
 void _flw_layoutVertex() {
     flw_vertexPos = vec4(_flw_a_pos, 1.0);
     flw_vertexColor = _flw_a_color;
     flw_vertexTexCoord = _flw_a_texCoord;
-    flw_vertexOverlay = _flw_a_overlay_light.xy;
-    flw_vertexLight = (_flw_a_overlay_light.zw >> 4) / 15.0;
+    flw_vertexOverlay = _flw_a_overlay;
+    flw_vertexLight = (_flw_a_light >> 4) / 15.0;
     flw_vertexNormal = _flw_a_normal;
 }