Consists of inconsistency

- Make architecture of indirect engine and draw manager match that of
other engines and draw managers

src/main/java/com/jozufozu/flywheel/backend/gl/GlStateTracker.java

@@ -23,28 +23,24 @@ public class GlStateTracker {
 		return program;
 	}
 
-	public static void _setBuffer(GlBufferType type, int buffer) {
-		BUFFERS[type.ordinal()] = buffer;
-	}
-
-	public static void _setProgram(int id) {
-		program = id;
+	public static void _setBuffer(GlBufferType type, int id) {
+		BUFFERS[type.ordinal()] = id;
 	}
 
 	public static void _setVertexArray(int id) {
 		vao = id;
 	}
 
+	public static void _setProgram(int id) {
+		program = id;
+	}
+
 	public static State getRestoreState() {
 		return new State(BUFFERS.clone(), vao, program);
 	}
 
 	public record State(int[] buffers, int vao, int program) implements AutoCloseable {
 		public void restore() {
-			if (program != GlStateTracker.program) {
-				GlStateManager._glUseProgram(program);
-			}
-
 			if (vao != GlStateTracker.vao) {
 				GlStateManager._glBindVertexArray(vao);
 			}
@@ -56,6 +52,10 @@ public class GlStateTracker {
 					GlStateManager._glBindBuffer(values[i].glEnum, buffers[i]);
 				}
 			}
+
+			if (program != GlStateTracker.program) {
+				GlStateManager._glUseProgram(program);
+			}
 		}
 
 		@Override

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

@@ -1,23 +1,66 @@
 package com.jozufozu.flywheel.backend.instancing.indirect;
 
+import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 
 import com.jozufozu.flywheel.api.instancer.InstancedPart;
-import com.jozufozu.flywheel.api.material.Material;
 import com.jozufozu.flywheel.api.struct.StructType;
 import com.jozufozu.flywheel.api.vertex.VertexType;
-import com.jozufozu.flywheel.core.model.Mesh;
+import com.jozufozu.flywheel.core.model.Model;
 import com.jozufozu.flywheel.util.Pair;
 
 public class IndirectDrawManager {
 
-	public final Map<Pair<StructType<?>, VertexType>, IndirectCullingGroup<?>> lists = new HashMap<>();
+	private final List<UninitializedModel> uninitializedModels = new ArrayList<>();
+	private final List<IndirectInstancer<?>> allInstancers = new ArrayList<>();
+	public final Map<Pair<StructType<?>, VertexType>, IndirectCullingGroup<?>> renderLists = new HashMap<>();
+
+	public void create(IndirectInstancer<?> instancer, Model model) {
+		uninitializedModels.add(new UninitializedModel(instancer, model));
+	}
+
+	public void flush() {
+		for (var model : uninitializedModels) {
+			add(model.instancer(), model.model());
+		}
+		uninitializedModels.clear();
+
+		for (IndirectCullingGroup<?> value : renderLists.values()) {
+			value.beginFrame();
+		}
+	}
+
+	public void delete() {
+		renderLists.values()
+				.forEach(IndirectCullingGroup::delete);
+		renderLists.clear();
+
+		allInstancers.forEach(IndirectInstancer::delete);
+		allInstancers.clear();
+	}
+
+	public void clearInstancers() {
+		allInstancers.forEach(IndirectInstancer::clear);
+	}
 
 	@SuppressWarnings("unchecked")
-	public <D extends InstancedPart> void add(IndirectInstancer<D> instancer, Material material, Mesh mesh) {
-		var indirectList = (IndirectCullingGroup<D>) lists.computeIfAbsent(Pair.of(instancer.type, mesh.getVertexType()), p -> new IndirectCullingGroup<>(p.first(), p.second()));
+	private <D extends InstancedPart> void add(IndirectInstancer<D> instancer, Model model) {
+		var meshes = model.getMeshes();
+		for (var entry : meshes.entrySet()) {
+			var material = entry.getKey();
+			var mesh = entry.getValue();
 
-		indirectList.drawSet.add(instancer, material, indirectList.meshPool.alloc(mesh));
+			var indirectList = (IndirectCullingGroup<D>) renderLists.computeIfAbsent(Pair.of(instancer.type, mesh.getVertexType()), p -> new IndirectCullingGroup<>(p.first(), p.second()));
+
+			indirectList.drawSet.add(instancer, material, indirectList.meshPool.alloc(mesh));
+
+			break; // TODO: support multiple meshes per model
+		}
+		allInstancers.add(instancer);
+	}
+
+	private record UninitializedModel(IndirectInstancer<?> instancer, Model model) {
 	}
 }

src/main/java/com/jozufozu/flywheel/backend/instancing/indirect/IndirectEngine.java

@@ -1,6 +1,6 @@
 package com.jozufozu.flywheel.backend.instancing.indirect;
 
-import java.util.ArrayList;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -30,52 +30,55 @@ import net.minecraft.world.phys.Vec3;
 
 public class IndirectEngine implements Engine {
 
-	public static int MAX_ORIGIN_DISTANCE = 100;
-
-	protected BlockPos originCoordinate = BlockPos.ZERO;
-
-	protected final ContextShader context;
-
-	protected final Map<StructType<?>, IndirectFactory<?>> factories = new HashMap<>();
-
-	protected final List<IndirectModel<?>> uninitializedModels = new ArrayList<>();
-	protected final IndirectDrawManager indirectDrawManager = new IndirectDrawManager();
+	protected final IndirectDrawManager drawManager = new IndirectDrawManager();
+	protected final Map<StructType<?>, IndirectInstancerFactory<?>> factories = new HashMap<>();
 
 	/**
 	 * The set of instance managers that are attached to this engine.
 	 */
-	private final WeakHashSet<InstanceManager<?>> instanceManagers;
+	private final WeakHashSet<InstanceManager<?>> instanceManagers = new WeakHashSet<>();
 
-	public IndirectEngine(ContextShader context) {
+	protected final ContextShader context;
+	protected final int sqrMaxOriginDistance;
+
+	protected BlockPos originCoordinate = BlockPos.ZERO;
+
+	public IndirectEngine(ContextShader context, int sqrMaxOriginDistance) {
 		this.context = context;
-
-		this.instanceManagers = new WeakHashSet<>();
+		this.sqrMaxOriginDistance = sqrMaxOriginDistance;
 	}
 
 	@SuppressWarnings("unchecked")
 	@NotNull
 	@Override
-	public <D extends InstancedPart> IndirectFactory<D> factory(StructType<D> type) {
-		return (IndirectFactory<D>) factories.computeIfAbsent(type, this::createFactory);
+	public <D extends InstancedPart> IndirectInstancerFactory<D> factory(StructType<D> type) {
+		return (IndirectInstancerFactory<D>) factories.computeIfAbsent(type, this::createFactory);
 	}
 
 	@NotNull
-	private <D extends InstancedPart> IndirectFactory<D> createFactory(StructType<D> type) {
-		return new IndirectFactory<>(type, uninitializedModels::add);
+	private <D extends InstancedPart> IndirectInstancerFactory<D> createFactory(StructType<D> type) {
+		return new IndirectInstancerFactory<>(type, drawManager::create);
+	}
+
+	@Override
+	public void beginFrame(TaskEngine taskEngine, RenderContext context) {
+		try (var restoreState = GlStateTracker.getRestoreState()) {
+			drawManager.flush();
+		}
 	}
 
 	@Override
 	public void renderStage(TaskEngine taskEngine, RenderContext context, RenderStage stage) {
 		try (var restoreState = GlStateTracker.getRestoreState()) {
 			setup();
-	
-			for (var list : indirectDrawManager.lists.values()) {
+
+			for (var list : drawManager.renderLists.values()) {
 				list.submit(stage);
 			}
 		}
 	}
 
-	private void setup() {
+	protected void setup() {
 		GlTextureUnit.T2.makeActive();
 		Minecraft.getInstance().gameRenderer.lightTexture().turnOnLightLayer();
 
@@ -87,14 +90,31 @@ public class IndirectEngine implements Engine {
 	}
 
 	@Override
-	public void delete() {
-		factories.values()
-				.forEach(IndirectFactory::delete);
+	public boolean maintainOriginCoordinate(Camera camera) {
+		Vec3 cameraPos = camera.getPosition();
 
-		indirectDrawManager.lists.values()
-				.forEach(IndirectCullingGroup::delete);
+		double distanceSqr = Vec3.atLowerCornerOf(originCoordinate)
+				.subtract(cameraPos)
+				.lengthSqr();
 
-		factories.clear();
+		if (distanceSqr > sqrMaxOriginDistance) {
+			shiftListeners(Mth.floor(cameraPos.x), Mth.floor(cameraPos.y), Mth.floor(cameraPos.z));
+			return true;
+		}
+		return false;
+	}
+
+	private void shiftListeners(int cX, int cY, int cZ) {
+		originCoordinate = new BlockPos(cX, cY, cZ);
+
+		drawManager.clearInstancers();
+
+		instanceManagers.forEach(InstanceManager::onOriginShift);
+	}
+
+	@Override
+	public void attachManagers(InstanceManager<?>... listener) {
+		Collections.addAll(instanceManagers, listener);
 	}
 
 	@Override
@@ -103,45 +123,9 @@ public class IndirectEngine implements Engine {
 	}
 
 	@Override
-	public void attachManagers(InstanceManager<?>... listener) {
-		instanceManagers.addAll(List.of(listener));
-	}
-
-	@Override
-	public boolean maintainOriginCoordinate(Camera camera) {
-		Vec3 cameraPos = camera.getPosition();
-
-		double distanceSqr = Vec3.atLowerCornerOf(originCoordinate)
-				.subtract(cameraPos)
-				.lengthSqr();
-
-		if (distanceSqr > MAX_ORIGIN_DISTANCE * MAX_ORIGIN_DISTANCE) {
-			shiftListeners(Mth.floor(cameraPos.x), Mth.floor(cameraPos.y), Mth.floor(cameraPos.z));
-			return true;
-		}
-		return false;
-	}
-
-	@Override
-	public void beginFrame(TaskEngine taskEngine, RenderContext context) {
-		try (var restoreState = GlStateTracker.getRestoreState()) {
-			for (var model : uninitializedModels) {
-				model.init(indirectDrawManager);
-			}
-			uninitializedModels.clear();
-	
-			for (IndirectCullingGroup<?> value : indirectDrawManager.lists.values()) {
-				value.beginFrame();
-			}
-		}
-	}
-
-	private void shiftListeners(int cX, int cY, int cZ) {
-		originCoordinate = new BlockPos(cX, cY, cZ);
-
-		factories.values().forEach(IndirectFactory::clear);
-
-		instanceManagers.forEach(InstanceManager::onOriginShift);
+	public void delete() {
+		factories.clear();
+		drawManager.delete();
 	}
 
 	@Override

src/main/java/com/jozufozu/flywheel/backend/instancing/indirect/IndirectFactory.java

@@ -1,50 +0,0 @@
-package com.jozufozu.flywheel.backend.instancing.indirect;
-
-import java.util.HashMap;
-import java.util.Map;
-import java.util.function.Consumer;
-
-import com.jozufozu.flywheel.api.instancer.InstancedPart;
-import com.jozufozu.flywheel.api.instancer.Instancer;
-import com.jozufozu.flywheel.api.instancer.InstancerFactory;
-import com.jozufozu.flywheel.api.struct.StructType;
-import com.jozufozu.flywheel.backend.instancing.AbstractInstancer;
-import com.jozufozu.flywheel.core.model.Model;
-
-public class IndirectFactory<D extends InstancedPart> implements InstancerFactory<D> {
-
-	protected final Map<Model, IndirectModel<D>> models = new HashMap<>();
-	protected final StructType<D> type;
-	private final Consumer<IndirectModel<D>> creationListener;
-
-	public IndirectFactory(StructType<D> type, Consumer<IndirectModel<D>> creationListener) {
-		this.type = type;
-		this.creationListener = creationListener;
-	}
-
-	@Override
-	public Instancer<D> model(Model modelKey) {
-		return models.computeIfAbsent(modelKey, this::createInstancer).getInstancer();
-	}
-
-	public void delete() {
-		models.values().forEach(IndirectModel::delete);
-		models.clear();
-	}
-
-	/**
-	 * Clear all instance data without freeing resources.
-	 */
-	public void clear() {
-		models.values()
-				.stream()
-				.map(IndirectModel::getInstancer)
-				.forEach(AbstractInstancer::clear);
-	}
-
-	private IndirectModel<D> createInstancer(Model model) {
-		var instancer = new IndirectModel<>(type, model);
-		this.creationListener.accept(instancer);
-		return instancer;
-	}
-}

src/main/java/com/jozufozu/flywheel/backend/instancing/indirect/IndirectInstancerFactory.java

@@ -0,0 +1,34 @@
+package com.jozufozu.flywheel.backend.instancing.indirect;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.function.BiConsumer;
+
+import com.jozufozu.flywheel.api.instancer.InstancedPart;
+import com.jozufozu.flywheel.api.instancer.Instancer;
+import com.jozufozu.flywheel.api.instancer.InstancerFactory;
+import com.jozufozu.flywheel.api.struct.StructType;
+import com.jozufozu.flywheel.core.model.Model;
+
+public class IndirectInstancerFactory<D extends InstancedPart> implements InstancerFactory<D> {
+
+	protected final StructType<D> type;
+	private final BiConsumer<IndirectInstancer<?>, Model> creationListener;
+	protected final Map<Model, IndirectInstancer<D>> models = new HashMap<>();
+
+	public IndirectInstancerFactory(StructType<D> type, BiConsumer<IndirectInstancer<?>, Model> creationListener) {
+		this.type = type;
+		this.creationListener = creationListener;
+	}
+
+	@Override
+	public Instancer<D> model(Model modelKey) {
+		return models.computeIfAbsent(modelKey, this::createInstancer);
+	}
+
+	private IndirectInstancer<D> createInstancer(Model model) {
+		var instancer = new IndirectInstancer<>(type);
+		creationListener.accept(instancer, model);
+		return instancer;
+	}
+}

src/main/java/com/jozufozu/flywheel/backend/instancing/indirect/IndirectMeshPool.java

@@ -1,28 +1,28 @@
 package com.jozufozu.flywheel.backend.instancing.indirect;
 
-import static org.lwjgl.opengl.GL46.*;
+import static org.lwjgl.opengl.GL15.glDeleteBuffers;
+import static org.lwjgl.opengl.GL44.GL_DYNAMIC_STORAGE_BIT;
+import static org.lwjgl.opengl.GL45.glCreateBuffers;
+import static org.lwjgl.opengl.GL45.glNamedBufferStorage;
+import static org.lwjgl.opengl.GL45.nglNamedBufferSubData;
 
-import java.nio.ByteBuffer;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
 import org.jetbrains.annotations.Nullable;
-import org.lwjgl.system.MemoryUtil;
 
 import com.jozufozu.flywheel.api.vertex.VertexType;
-import com.jozufozu.flywheel.backend.instancing.instancing.ElementBuffer;
 import com.jozufozu.flywheel.backend.memory.MemoryBlock;
 import com.jozufozu.flywheel.core.model.Mesh;
 
 public class IndirectMeshPool {
+	private final VertexType vertexType;
 
 	private final Map<Mesh, BufferedMesh> meshes = new HashMap<>();
 	private final List<BufferedMesh> meshList = new ArrayList<>();
 
-	final VertexType vertexType;
-
 	final int vbo;
 	private final MemoryBlock clientStorage;
 
@@ -76,7 +76,7 @@ public class IndirectMeshPool {
 
 			model.buffer(ptr);
 
-			byteIndex += model.getByteSize();
+			byteIndex += model.size();
 			baseVertex += model.mesh.getVertexCount();
 		}
 
@@ -90,38 +90,44 @@ public class IndirectMeshPool {
 		meshList.clear();
 	}
 
-	public class BufferedMesh {
+	public VertexType getVertexType() {
+		return vertexType;
+	}
 
+	public class BufferedMesh {
 		public final Mesh mesh;
 		private final int vertexCount;
 		private long byteIndex;
 		private int baseVertex;
 
-		public BufferedMesh(Mesh mesh) {
+		private BufferedMesh(Mesh mesh) {
 			this.mesh = mesh;
 
 			vertexCount = mesh.getVertexCount();
 		}
 
 		private void buffer(long ptr) {
-			this.mesh.write(ptr + byteIndex);
+			mesh.write(ptr + byteIndex);
 		}
 
-		public int getByteSize() {
-			return IndirectMeshPool.this.vertexType.getLayout().getStride() * this.vertexCount;
+		public Mesh getMesh() {
+			return mesh;
+		}
+
+		public int size() {
+			return mesh.size();
 		}
 
 		public int getBaseVertex() {
 			return baseVertex;
 		}
 
-		public int getVertexCount() {
-			return this.vertexCount;
+		public int getIndexCount() {
+			return vertexCount * 6 / 4;
 		}
 
-		public int getIndexCount() {
-			return this.vertexCount * 6 / 4;
+		public VertexType getVertexType() {
+			return vertexType;
 		}
 	}
-
 }

src/main/java/com/jozufozu/flywheel/backend/instancing/indirect/IndirectModel.java

@@ -1,43 +0,0 @@
-package com.jozufozu.flywheel.backend.instancing.indirect;
-
-import com.jozufozu.flywheel.api.instancer.InstancedPart;
-import com.jozufozu.flywheel.api.struct.StructType;
-import com.jozufozu.flywheel.core.model.Model;
-
-public class IndirectModel<D extends InstancedPart> {
-
-	private final Model model;
-	private final IndirectInstancer<D> instancer;
-
-	public IndirectModel(StructType<D> type, Model model) {
-		this.model = model;
-		this.instancer = new IndirectInstancer<>(type);
-	}
-
-	public void init(IndirectDrawManager indirectDrawManager) {
-		var materialMeshMap = this.model.getMeshes();
-		for (var entry : materialMeshMap.entrySet()) {
-			var material = entry.getKey();
-			var mesh = entry.getValue();
-			indirectDrawManager.add(instancer, material, mesh);
-
-			return; // TODO: support multiple meshes per model
-		}
-	}
-
-	public IndirectInstancer<D> getInstancer() {
-		return instancer;
-	}
-
-	public Model getModel() {
-		return model;
-	}
-
-	public int getVertexCount() {
-		return model.getVertexCount() * instancer.instanceCount;
-	}
-
-	public void delete() {
-
-	}
-}

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

@@ -80,7 +80,7 @@ public class InstancingEngine implements Engine {
 
 		try (var restoreState = GlStateTracker.getRestoreState()) {
 			setup();
-	
+
 			render(drawSet);
 		}
 	}

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

@@ -64,7 +64,7 @@ public class BackendTypes {
 			.properName("GL46 Compute Culling")
 			.shortName("indirect")
 			.engineMessage(new TextComponent("Using Indirect Engine").withStyle(ChatFormatting.GREEN))
-			.engineSupplier(() -> new IndirectEngine(Components.WORLD))
+			.engineSupplier(() -> new IndirectEngine(Components.WORLD, 100 * 100))
 			.fallback(() -> BackendTypes.INSTANCING)
 			.supported(() -> !ShadersModHandler.isShaderPackInUse() && GlCompat.getInstance()
 					.supportsIndirect())