Misaki/GhostEngine
2
0
Fork 1
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

feat(meshlet): refactor meshlet pipeline and add render pass

Browse Source 
Refactor meshlet data structures to use packed uint triangle indices, update meshlet cooking and upload logic, and align HLSL mesh shader. Add MeshRenderPass with bindless rendering and blit support. Improve RenderExtractionSystem, RootSignatureLayout, and TestRenderPipeline. Update GraphicsTestWindow for new pipeline and meshlet logic. Includes code cleanups and comments.
This commit is contained in:
Misaki
2026-03-25 13:13:03 +09:00
parent 7860e5e341
commit b729ca86f5
12 changed files with 455 additions and 120 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
src/Runtime/Ghost.Graphics/RenderPipeline/ShaderCode.hlsl
View File

@@ -20,7 +20,7 @@ struct Meshlet
uint packedCounts; // byte vertexCount, byte triangleCount, byte localMaterialIndex, byte lodLevel
};
[numthreads(64, 1, 1)] // 64 threads for max 64 vertices and up to 124 triangles
[numthreads(128, 1, 1)] // 128 threads to cover max 64 vertices and 124 triangles
[outputtopology("triangle")]
void MSMain(
uint3 groupThreadID : SV_GroupThreadID,
@@ -59,23 +59,12 @@ void MSMain(
}
// Write triangle output (1 thread processes 1 triangle)
// We could pack 3 indices in a uint or just use byte offset
// In our CPU code, we packed it as individual bytes, so 3 bytes per triangle.
// For 124 triangles, we have 372 bytes.
if (groupThreadID.x < triangleCount)
{
uint triangleIndex = groupThreadID.x;
uint baseOffset = m.triangleOffset + triangleIndex * 3;
// Load 4 bytes to get the 3 index bytes
// Needs byte-aligned loading
uint wordOffset = baseOffset & ~3;
uint shift = (baseOffset & 3) * 8;
uint packedIndices1 = meshletTrianglesBuffer.Load(wordOffset);
uint packedIndices2 = meshletTrianglesBuffer.Load(wordOffset + 4);
uint64_t combined = ((uint64_t)packedIndices2 << 32) | packedIndices1;
uint packedIndices = (uint)(combined >> shift);
// Load the packed 32-bit integer containing the 3 local indices
uint packedIndices = meshletTrianglesBuffer.Load((m.triangleOffset + triangleIndex) * 4);
uint i0 = packedIndices & 0xFF;
uint i1 = (packedIndices >> 8) & 0xFF;