It finally works

res/shaders/LightCulling.slang

@@ -22,7 +22,7 @@ struct CullingParams
     RWTexture2D<uint2> oLightGrid;
     RWTexture2D<uint2> tLightGrid;
 };
-layout(set=2)
+
 ParameterBlock<CullingParams> pCullingParams;
 // Debug
 //Texture2D lightCountHeatMap;

res/shaders/MeshletBasePass.slang

@@ -65,12 +65,6 @@ struct PrimitiveAttributes
 	uint cull: SV_CullPrimitive;
 };
 
-uint unpackPrimitiveIndices(uint index)
-{
-  uint32_t packed = pScene.primitiveIndices[index / 4];
-  return (packed >> (index % 4)) & 0xff;
-}
-
 [numthreads(MESH_GROUP_SIZE, 1, 1)]
 [outputtopology("triangle")]
 [shader("mesh")]

res/shaders/lib/Common.slang

@@ -10,7 +10,7 @@ struct ViewParameter
     float4 cameraPos_WS;
     float2 screenDimensions;
 }
-uniform ParameterBlock<ViewParameter> pViewParams;
+ParameterBlock<ViewParameter> pViewParams;
 
 float4 clipToView(float4 clip)
 {

res/shaders/lib/DispatchParams.slang

@@ -8,5 +8,4 @@ struct DispatchParams
 	uint pad1;
 	RWStructuredBuffer<Frustum> frustums;
 }
-layout(set=1)
 ParameterBlock<DispatchParams> pDispatchParams;

res/shaders/lib/LightEnv.slang

@@ -63,5 +63,4 @@ struct LightEnv
     StructuredBuffer<PointLight> pointLights;
     uint numPointLights;
 };
-layout(set=3)
 ParameterBlock<LightEnv> pLightEnv;

res/shaders/lib/Material.slang

@@ -8,5 +8,4 @@ interface IMaterial
 	BRDF prepare(MaterialParameter input);
 };
 
-layout(set=4)
 ParameterBlock<IMaterial> pMaterial;

res/shaders/lib/Scene.slang

@@ -38,9 +38,8 @@ struct Scene
 	StructuredBuffer<InstanceData> instances;
 	StructuredBuffer<MeshData> meshData;
 	StructuredBuffer<MeshletDescription> meshletInfos;
-  // uint8_t is not valid in DXIL
-	StructuredBuffer<uint32_t> primitiveIndices;
+	StructuredBuffer<uint8_t> primitiveIndices;
 	StructuredBuffer<uint32_t> vertexIndices;
 };
-uniform ParameterBlock<Scene> pScene;
+ParameterBlock<Scene> pScene;