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Use the proper HLSL quad wave intrinsics in the SPD's quad reduction.… #12

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Use the proper HLSL quad wave intrinsics in the SPD's quad reduction.… #12

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9 changes: 4 additions & 5 deletions sdk/include/FidelityFX/gpu/spd/ffx_spd.h
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Original file line number Diff line number Diff line change
Expand Up @@ -155,11 +155,10 @@ FfxFloat32x4 SpdReduceQuad(FfxFloat32x4 v)
#elif defined(FFX_HLSL) && !defined(FFX_SPD_NO_WAVE_OPERATIONS)

// requires SM6.0
FfxUInt32 quad = WaveGetLaneIndex() & (~0x3);
FfxFloat32x4 v0 = v;
FfxFloat32x4 v1 = WaveReadLaneAt(v, quad | 1);
FfxFloat32x4 v2 = WaveReadLaneAt(v, quad | 2);
FfxFloat32x4 v3 = WaveReadLaneAt(v, quad | 3);
FfxFloat32x4 v0 = v;
FfxFloat32x4 v1 = QuadReadAcrossX(v);
FfxFloat32x4 v2 = QuadReadAcrossY(v);
FfxFloat32x4 v3 = QuadReadAcrossDiagonal(v);
return SpdReduce4(v0, v1, v2, v3);
/*
// if SM6.0 is not available, you can use the AMD shader intrinsics
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