Seele/res/shaders/VisibilityCompute.slang

import Common;
import Scene;

struct VisibilityCullingData
{
    Texture2D<uint> visibilityTexture;
    globallycoherent RWStructuredBuffer<MeshletCullingInfo> cullingInfos;
};
ParameterBlock<VisibilityCullingData> pVisibilityParams;

[numthreads(BLOCK_SIZE, BLOCK_SIZE, 1)]
[shader("compute")]
void computeMain(
    uint3 dispatchThreadID: SV_DispatchThreadID,
){
    int3 texCoords = int3(dispatchThreadID.xy, 0);
    uint encoded = pVisibilityParams.visibilityTexture.Load(texCoords).r;
    uint2 decoded = decodePrimitive(encoded);
    uint arrIdx = decoded.x / 32;
    uint bit = decoded.x % 32;
    uint32_t orig;
    InterlockedOr(pVisibilityParams.cullingInfos[decoded.y].visible[arrIdx], (1 << bit), orig);
}