Separate separate attributes

- Add new GL43 vertex array impl
- GlNumericType cleaning
- Make GlBuffer growth more abstract
- Organize VertexArrayGL3, track bound ebo

src/main/java/com/jozufozu/flywheel/api/layout/BufferLayout.java

@@ -56,7 +56,7 @@ public class BufferLayout {
 	private static int calculateStride(List<VertexAttribute> layoutItems) {
 		int stride = 0;
 		for (var spec : layoutItems) {
-			stride += spec.getByteWidth();
+			stride += spec.byteWidth();
 		}
 		return stride;
 	}

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

@@ -41,7 +41,7 @@ public class GPUInstancer<I extends Instance> extends AbstractInstancer<I> {
 		}
 
 		vbo = new GlBuffer(GlBufferUsage.DYNAMIC_DRAW);
-		vbo.growthMargin(instanceStride * 16);
+		vbo.growthFunction(l -> Math.max(l + (long) instanceStride * 16, (long) (l * 1.6)));
 	}
 
 	public void update() {
@@ -70,7 +70,7 @@ public class GPUInstancer<I extends Instance> extends AbstractInstancer<I> {
 
 			int count = instances.size();
 			for (int i = changed.nextSetBit(0); i >= 0 && i < count; i = changed.nextSetBit(i + 1)) {
-				writer.write(ptr + instanceStride * i, instances.get(i));
+				writer.write(ptr + (long) instanceStride * i, instances.get(i));
 			}
 
 			changed.clear();

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

@@ -40,7 +40,7 @@ public class InstancedMeshPool {
 		this.vertexType = vertexType;
 		int stride = vertexType.getLayout().getStride();
 		vbo = new GlBuffer();
-		vbo.growthMargin(stride * 32);
+		vbo.growthFunction(l -> Math.max(l + stride * 32L, (long) (l * 1.6)));
 	}
 
 	public VertexType getVertexType() {

src/main/java/com/jozufozu/flywheel/gl/GlNumericType.java

@@ -1,12 +1,5 @@
 package com.jozufozu.flywheel.gl;
 
-import java.nio.ByteBuffer;
-import java.util.Arrays;
-import java.util.Locale;
-import java.util.Map;
-import java.util.stream.Collectors;
-
-import org.jetbrains.annotations.Nullable;
 import org.lwjgl.opengl.GL11;
 
 public enum GlNumericType {
@@ -20,13 +13,9 @@ public enum GlNumericType {
 	DOUBLE(8, "double", GL11.GL_DOUBLE),
 	;
 
-	private static final GlNumericType[] VALUES = values();
-	private static final Map<String, GlNumericType> NAME_LOOKUP = Arrays.stream(VALUES)
-			.collect(Collectors.toMap(GlNumericType::getTypeName, type -> type));
-
-	private final int byteWidth;
-	private final String typeName;
-	private final int glEnum;
+	public final int byteWidth;
+	public final String typeName;
+	public final int glEnum;
 
 	GlNumericType(int bytes, String name, int glEnum) {
 		this.byteWidth = bytes;
@@ -34,31 +23,16 @@ public enum GlNumericType {
 		this.glEnum = glEnum;
 	}
 
-	public int getByteWidth() {
-		return this.byteWidth;
+	public int byteWidth() {
+		return byteWidth;
 	}
 
-	public String getTypeName() {
-		return this.typeName;
+	public String typeName() {
+		return typeName;
 	}
 
-	public int getGlEnum() {
-		return this.glEnum;
-	}
-
-	public void castAndBuffer(ByteBuffer buf, int val) {
-		if (this == UBYTE || this == BYTE) {
-			buf.put((byte) val);
-		} else if (this == USHORT || this == SHORT) {
-			buf.putShort((short) val);
-		} else if (this == UINT || this == INT) {
-			buf.putInt(val);
-		}
-	}
-
-	@Nullable
-	public static GlNumericType byName(String name) {
-		return name == null ? null : NAME_LOOKUP.get(name.toLowerCase(Locale.ROOT));
+	public int glEnum() {
+		return glEnum;
 	}
 
 	@Override

src/main/java/com/jozufozu/flywheel/gl/array/GlVertexArray.java

@@ -15,6 +15,8 @@ public abstract class GlVertexArray extends GlObject {
 	public static GlVertexArray create() {
 		if (GlVertexArrayDSA.SUPPORTED) {
 			return new GlVertexArrayDSA();
+		} else if (GlVertexArraySeparateAttributes.SUPPORTED) {
+			return new GlVertexArraySeparateAttributes();
 		} else if (GlVertexArrayGL3.Core33.SUPPORTED) {
 			return new GlVertexArrayGL3.Core33();
 		} else if (GlVertexArrayGL3.ARB.SUPPORTED) {

src/main/java/com/jozufozu/flywheel/gl/array/GlVertexArrayDSA.java

@@ -57,11 +57,9 @@ public class GlVertexArrayDSA extends GlVertexArray {
 
 			if (!attribute.equals(attributes[attribIndex])) {
 				if (attribute instanceof VertexAttribute.Float f) {
-					GL45C.glVertexArrayAttribFormat(handle, attribIndex, f.size(), f.type()
-							.getGlEnum(), f.normalized(), offset);
+					GL45C.glVertexArrayAttribFormat(handle, attribIndex, f.size(), f.type().glEnum, f.normalized(), offset);
 				} else if (attribute instanceof VertexAttribute.Int vi) {
-					GL45C.glVertexArrayAttribIFormat(handle, attribIndex, vi.size(), vi.type()
-							.getGlEnum(), offset);
+					GL45C.glVertexArrayAttribIFormat(handle, attribIndex, vi.size(), vi.type().glEnum, offset);
 				}
 				attributes[attribIndex] = attribute;
 			}
@@ -72,7 +70,7 @@ public class GlVertexArrayDSA extends GlVertexArray {
 			}
 
 			attribIndex++;
-			offset += attribute.getByteWidth();
+			offset += attribute.byteWidth();
 		}
 	}
 

src/main/java/com/jozufozu/flywheel/gl/array/GlVertexArrayGL3.java

@@ -23,7 +23,8 @@ public abstract class GlVertexArrayGL3 extends GlVertexArray {
 	private final long[] bindingOffsets = new long[MAX_ATTRIB_BINDINGS];
 	private final int[] bindingStrides = new int[MAX_ATTRIB_BINDINGS];
 	private final int[] bindingDivisors = new int[MAX_ATTRIB_BINDINGS];
-	private int elementBufferBinding = 0;
+	private int requestedElementBuffer = 0;
+	private int boundElementBuffer = 0;
 
 	public GlVertexArrayGL3() {
 		handle(GL30.glGenVertexArrays());
@@ -33,42 +34,11 @@ public abstract class GlVertexArrayGL3 extends GlVertexArray {
 	public void bindForDraw() {
 		super.bindForDraw();
 
-		for (int attribIndex = attributeDirty.nextSetBit(0); attribIndex < MAX_ATTRIB_BINDINGS && attribIndex >= 0; attribIndex = attributeDirty.nextSetBit(attribIndex + 1)) {
+		maybeUpdateAttributes();
 
-			int bindingIndex = attributeBindings[attribIndex];
-			var attribute = attributes[attribIndex];
-
-			if (bindingIndex == -1 || attribute == null) {
-				continue;
-			}
-
-			GlBufferType.ARRAY_BUFFER.bind(bindingBuffers[bindingIndex]);
-			GL20C.glEnableVertexAttribArray(attribIndex);
-
-			long offset = bindingOffsets[bindingIndex] + attributeOffsets[attribIndex];
-			int stride = bindingStrides[bindingIndex];
-
-			if (attribute instanceof VertexAttribute.Float f) {
-				GL32.glVertexAttribPointer(attribIndex, f.size(), f.type()
-						.getGlEnum(), f.normalized(), stride, offset);
-			} else if (attribute instanceof VertexAttribute.Int vi) {
-				GL32.glVertexAttribIPointer(attribIndex, vi.size(), vi.type()
-						.getGlEnum(), stride, offset);
-			}
-
-			int divisor = bindingDivisors[bindingIndex];
-			if (divisor != 0) {
-				setDivisor(attribIndex, divisor);
-			}
-		}
-
-		GlBufferType.ELEMENT_ARRAY_BUFFER.bind(elementBufferBinding);
-
-		attributeDirty.clear();
+		maybeUpdateEBOBinding();
 	}
 
-	protected abstract void setDivisor(int attribIndex, int divisor);
-
 	@Override
 	public void bindVertexBuffer(int bindingIndex, int vbo, long offset, int stride) {
 		if (bindingBuffers[bindingIndex] != vbo || bindingOffsets[bindingIndex] != offset || bindingStrides[bindingIndex] != stride) {
@@ -83,7 +53,6 @@ public abstract class GlVertexArrayGL3 extends GlVertexArray {
 			}
 		}
 	}
-
 	@Override
 	public void setBindingDivisor(int bindingIndex, int divisor) {
 		if (bindingDivisors[bindingIndex] != divisor) {
@@ -104,15 +73,59 @@ public abstract class GlVertexArrayGL3 extends GlVertexArray {
 			attributeDirty.set(attribIndex);
 
 			attribIndex++;
-			offset += attribute.getByteWidth();
+			offset += attribute.byteWidth();
 		}
 	}
 
 	@Override
 	public void setElementBuffer(int ebo) {
-		elementBufferBinding = ebo;
+		requestedElementBuffer = ebo;
 	}
 
+	private void maybeUpdateEBOBinding() {
+		if (requestedElementBuffer != boundElementBuffer) {
+			GlBufferType.ELEMENT_ARRAY_BUFFER.bind(requestedElementBuffer);
+			boundElementBuffer = requestedElementBuffer;
+		}
+	}
+
+	private void maybeUpdateAttributes() {
+		for (int attribIndex = attributeDirty.nextSetBit(0); attribIndex < MAX_ATTRIB_BINDINGS && attribIndex >= 0; attribIndex = attributeDirty.nextSetBit(attribIndex + 1)) {
+			updateAttribute(attribIndex);
+		}
+		attributeDirty.clear();
+	}
+
+	private void updateAttribute(int attribIndex) {
+		int bindingIndex = attributeBindings[attribIndex];
+		var attribute = attributes[attribIndex];
+
+		if (bindingIndex == -1 || attribute == null) {
+			return;
+		}
+
+		GlBufferType.ARRAY_BUFFER.bind(bindingBuffers[bindingIndex]);
+		GL20C.glEnableVertexAttribArray(attribIndex);
+
+		long offset = bindingOffsets[bindingIndex] + attributeOffsets[attribIndex];
+		int stride = bindingStrides[bindingIndex];
+
+		if (attribute instanceof VertexAttribute.Float f) {
+			GL32.glVertexAttribPointer(attribIndex, f.size(), f.type()
+					.glEnum(), f.normalized(), stride, offset);
+		} else if (attribute instanceof VertexAttribute.Int vi) {
+			GL32.glVertexAttribIPointer(attribIndex, vi.size(), vi.type()
+					.glEnum(), stride, offset);
+		}
+
+		int divisor = bindingDivisors[bindingIndex];
+		if (divisor != 0) {
+			setDivisor(attribIndex, divisor);
+		}
+	}
+
+	protected abstract void setDivisor(int attribIndex, int divisor);
+
 	public static class Core33 extends GlVertexArrayGL3 {
 		public static final boolean SUPPORTED = isSupported();
 

src/main/java/com/jozufozu/flywheel/gl/array/GlVertexArraySeparateAttributes.java

@@ -0,0 +1,93 @@
+package com.jozufozu.flywheel.gl.array;
+
+import java.util.BitSet;
+import java.util.List;
+
+import org.lwjgl.opengl.GL43C;
+import org.lwjgl.system.Checks;
+
+import com.jozufozu.flywheel.gl.GlCompat;
+import com.jozufozu.flywheel.gl.GlStateTracker;
+import com.jozufozu.flywheel.gl.buffer.GlBufferType;
+import com.jozufozu.flywheel.util.FlwUtil;
+
+public class GlVertexArraySeparateAttributes extends GlVertexArray {
+	public static final boolean SUPPORTED = isSupported();
+	private final BitSet attributeEnabled = new BitSet(MAX_ATTRIBS);
+	private final VertexAttribute[] attributes = new VertexAttribute[MAX_ATTRIBS];
+	private final int[] attributeBindings = FlwUtil.initArray(MAX_ATTRIBS, -1);
+	private final int[] bindingBuffers = new int[MAX_ATTRIB_BINDINGS];
+	private final long[] bindingOffsets = new long[MAX_ATTRIB_BINDINGS];
+	private final int[] bindingStrides = new int[MAX_ATTRIB_BINDINGS];
+	private final int[] bindingDivisors = new int[MAX_ATTRIB_BINDINGS];
+
+	private int elementBufferBinding = 0;
+
+	public GlVertexArraySeparateAttributes() {
+		handle(GL43C.glGenVertexArrays());
+	}
+
+	@Override
+	public void bindVertexBuffer(final int bindingIndex, final int vbo, final long offset, final int stride) {
+		if (bindingBuffers[bindingIndex] != vbo || bindingOffsets[bindingIndex] != offset || bindingStrides[bindingIndex] != stride) {
+			GlStateTracker.bindVao(handle());
+			GL43C.glBindVertexBuffer(bindingIndex, vbo, offset, stride);
+			bindingBuffers[bindingIndex] = vbo;
+			bindingOffsets[bindingIndex] = offset;
+			bindingStrides[bindingIndex] = stride;
+		}
+	}
+
+	@Override
+	public void setBindingDivisor(final int bindingIndex, final int divisor) {
+		if (bindingDivisors[bindingIndex] != divisor) {
+			GL43C.glVertexBindingDivisor(bindingIndex, divisor);
+			bindingDivisors[bindingIndex] = divisor;
+		}
+	}
+
+	@Override
+	public void bindAttributes(final int bindingIndex, final int startAttribIndex, List<VertexAttribute> vertexAttributes) {
+		GlStateTracker.bindVao(handle());
+		int attribIndex = startAttribIndex;
+		int offset = 0;
+
+		for (var attribute : vertexAttributes) {
+			if (!attributeEnabled.get(attribIndex)) {
+				GL43C.glEnableVertexAttribArray(attribIndex);
+				attributeEnabled.set(attribIndex);
+			}
+
+			if (!attribute.equals(attributes[attribIndex])) {
+				if (attribute instanceof VertexAttribute.Float f) {
+					GL43C.glVertexAttribFormat(attribIndex, f.size(), f.type().glEnum, f.normalized(), offset);
+				} else if (attribute instanceof VertexAttribute.Int vi) {
+					GL43C.glVertexAttribIFormat(attribIndex, vi.size(), vi.type().glEnum, offset);
+				}
+				attributes[attribIndex] = attribute;
+			}
+
+			if (attributeBindings[attribIndex] != bindingIndex) {
+				GL43C.glVertexAttribBinding(attribIndex, bindingIndex);
+				attributeBindings[attribIndex] = bindingIndex;
+			}
+
+			attribIndex++;
+			offset += attribute.byteWidth();
+		}
+	}
+
+	@Override
+	public void setElementBuffer(int ebo) {
+		if (elementBufferBinding != ebo) {
+			GlStateTracker.bindVao(handle());
+			GlBufferType.ELEMENT_ARRAY_BUFFER.bind(ebo);
+			elementBufferBinding = ebo;
+		}
+	}
+
+	private static boolean isSupported() {
+		var c = GlCompat.CAPABILITIES;
+		return GlCompat.ALLOW_DSA && Checks.checkFunctions(c.glBindVertexBuffer, c.glVertexBindingDivisor, c.glEnableVertexAttribArray, c.glVertexAttribFormat, c.glVertexAttribIFormat, c.glVertexAttribBinding);
+	}
+}

src/main/java/com/jozufozu/flywheel/gl/array/VertexAttribute.java

@@ -3,7 +3,7 @@ package com.jozufozu.flywheel.gl.array;
 import com.jozufozu.flywheel.gl.GlNumericType;
 
 public sealed interface VertexAttribute {
-	int getByteWidth();
+	int byteWidth();
 
 	/**
 	 * A bindable attribute in a vertex array.
@@ -14,8 +14,8 @@ public sealed interface VertexAttribute {
 	 */
 	record Float(GlNumericType type, int size, boolean normalized) implements VertexAttribute {
 		@Override
-		public int getByteWidth() {
-			return size * type.getByteWidth();
+		public int byteWidth() {
+			return size * type.byteWidth();
 		}
 	}
 
@@ -27,8 +27,8 @@ public sealed interface VertexAttribute {
 	 */
 	record Int(GlNumericType type, int size) implements VertexAttribute {
 		@Override
-		public int getByteWidth() {
-			return size * type.getByteWidth();
+		public int byteWidth() {
+			return size * type.byteWidth();
 		}
 	}
 }

src/main/java/com/jozufozu/flywheel/gl/buffer/GlBuffer.java

@@ -1,7 +1,5 @@
 package com.jozufozu.flywheel.gl.buffer;
 
-import static org.lwjgl.opengl.GL15.glDeleteBuffers;
-
 import org.lwjgl.system.MemoryUtil;
 
 import com.jozufozu.flywheel.gl.GlObject;
@@ -9,6 +7,8 @@ import com.jozufozu.flywheel.lib.memory.FlwMemoryTracker;
 import com.jozufozu.flywheel.lib.memory.MemoryBlock;
 import com.mojang.blaze3d.platform.GlStateManager;
 
+import it.unimi.dsi.fastutil.longs.LongUnaryOperator;
+
 public class GlBuffer extends GlObject {
 	public static final Buffer IMPL = new Buffer.DSA().fallback();
 	protected final GlBufferUsage usage;
@@ -17,9 +17,9 @@ public class GlBuffer extends GlObject {
 	 */
 	protected long size;
 	/**
-	 * How much extra room to give the buffer when we reallocate.
+	 * A mapping to adjust the size of the buffer when allocating.
 	 */
-	protected int growthMargin;
+	protected LongUnaryOperator growthFunction = LongUnaryOperator.identity();
 
 	public GlBuffer() {
 		this(GlBufferUsage.STATIC_DRAW);
@@ -70,7 +70,7 @@ public class GlBuffer extends GlObject {
 		int newHandle = IMPL.create();
 		IMPL.data(newHandle, size, MemoryUtil.NULL, usage.glEnum);
 		IMPL.copyData(oldHandle, newHandle, 0, 0, oldSize);
-		glDeleteBuffers(oldHandle);
+		GlStateManager._glDeleteBuffers(oldHandle);
 		handle(newHandle);
 
 		FlwMemoryTracker._allocGPUMemory(size);
@@ -80,7 +80,7 @@ public class GlBuffer extends GlObject {
 	 * Increase the size of the buffer to at least the given capacity.
 	 */
 	private void increaseSize(long capacity) {
-		size = capacity + growthMargin;
+		size = growthFunction.apply(capacity);
 	}
 
 	public void upload(MemoryBlock directBuffer) {
@@ -94,8 +94,8 @@ public class GlBuffer extends GlObject {
 		return new MappedBuffer(handle(), size);
 	}
 
-	public void growthMargin(int growthMargin) {
-		this.growthMargin = growthMargin;
+	public void growthFunction(LongUnaryOperator growthFunction) {
+		this.growthFunction = growthFunction;
 	}
 
 	public long size() {

src/main/java/com/jozufozu/flywheel/lib/util/QuadConverter.java

@@ -58,7 +58,7 @@ public class QuadConverter {
 	}
 
 	private void grow(int quads) {
-		int byteSize = quads * 6 * GlNumericType.UINT.getByteWidth();
+		int byteSize = quads * 6 * GlNumericType.UINT.byteWidth();
 		final long ptr = MemoryUtil.nmemAlloc(byteSize);
 
 		fillBuffer(ptr, quads);