More memes

src/main/java/me/cortex/voxy/client/core/rendering/DefaultGeometryManager.java

@@ -24,11 +24,18 @@ public class DefaultGeometryManager extends AbstractGeometryManager {
     private final GlBuffer sectionMetaBuffer;
     private final BufferArena geometryBuffer;
 
+    private final int geometryElementSize;
+
     public DefaultGeometryManager(long geometryBufferSize, int maxSections) {
+        this(geometryBufferSize, maxSections, 8);//8 is default quad size
+    }
+
+    public DefaultGeometryManager(long geometryBufferSize, int maxSections, int elementSize) {
         super(maxSections);
         this.sectionMetaBuffer = new GlBuffer(((long) maxSections) * SECTION_METADATA_SIZE);
-        this.geometryBuffer = new BufferArena(geometryBufferSize, 8);
+        this.geometryBuffer = new BufferArena(geometryBufferSize, elementSize);
         this.pos2id.defaultReturnValue(-1);
+        this.geometryElementSize = elementSize;
     }
 
     IntArrayList uploadResults() {
@@ -169,7 +176,7 @@ public class DefaultGeometryManager extends AbstractGeometryManager {
             System.err.println(msg);
             return null;
         }
-        return new SectionMeta(geometry.position, geometry.aabb, geometryPtr, (int) (geometry.geometryBuffer.size/8), geometry.offsets);
+        return new SectionMeta(geometry.position, geometry.aabb, geometryPtr, (int) (geometry.geometryBuffer.size/this.geometryElementSize), geometry.offsets);
     }
 
     protected void freeMeta(SectionMeta meta) {

src/main/java/me/cortex/voxy/client/core/rendering/Gl46MeshletsFarWorldRenderer.java

@@ -32,6 +32,13 @@ import static org.lwjgl.opengl.GL45C.nglClearNamedBufferData;
 import static org.lwjgl.opengl.NVMeshShader.glDrawMeshTasksNV;
 import static org.lwjgl.opengl.NVRepresentativeFragmentTest.GL_REPRESENTATIVE_FRAGMENT_TEST_NV;
 
+//TODO: NOTE
+// can do "meshlet compaction"
+// that is, meshlets are refered not by the meshlet id but by an 8 byte alligned index, (the quad index)
+// this means that non full meshlets can have the tailing data be truncated and used in the next meshlet
+// as long as the number of quads in the meshlet is stored in the header
+// the shader can cull the verticies of any quad that has its index over the expected quuad count
+// this could potentially result in a fair bit of memory savings (especially if used in normal mc terrain rendering)
 public class Gl46MeshletsFarWorldRenderer extends AbstractFarWorldRenderer<Gl46MeshletViewport, DefaultGeometryManager> {
     private final Shader meshletGenerator = Shader.make()
             .add(ShaderType.COMPUTE, "voxy:lod/gl46mesh/cmdgen.comp")
@@ -51,9 +58,9 @@ public class Gl46MeshletsFarWorldRenderer extends AbstractFarWorldRenderer<Gl46M
     private final GlBuffer meshletBuffer;
 
     public Gl46MeshletsFarWorldRenderer(int geometrySize, int maxSections) {
-        super(new DefaultGeometryManager(geometrySize*8L, maxSections));
+        super(new DefaultGeometryManager(alignUp(geometrySize*8L, 8*128), maxSections, 8*128));
         this.glDrawIndirect = new GlBuffer(4*5);
-        this.meshletBuffer = new GlBuffer(4*1000000);//TODO: Make max meshlet count configurable
+        this.meshletBuffer = new GlBuffer(4*1000000);//TODO: Make max meshlet count configurable, not just 1 million (even tho thats a max of 126 million quads per frame)
     }
 
     protected void bindResources(Gl46MeshletViewport viewport) {
@@ -161,4 +168,8 @@ public class Gl46MeshletsFarWorldRenderer extends AbstractFarWorldRenderer<Gl46M
         this.glDrawIndirect.free();
         this.meshletBuffer.free();
     }
+
+    public static long alignUp(long n, long alignment) {
+        return (n + alignment - 1) & -alignment;
+    }
 }

src/main/java/me/cortex/voxy/client/core/rendering/building/RenderDataFactory.java

@@ -85,6 +85,8 @@ public class RenderDataFactory {
             return new BuiltSection(section.key);
         }
 
+        //TODO: generate the meshlets here
+
         var buff = new MemoryBuffer(quadCount*8L);
         long ptr = buff.address;
         int[] offsets = new int[8];