RSSetShadingRateImage (consoles XBOX Series)

void RSSetShadingRateImage(
    ID3D12Resource  shadingRateImage
)

ceil((float)rtWidth / VRSTileSize), ceil((float)rtHeight / VRSTileSize)

postRasterizerRate = ApplyCombiner(Combiners[0], CommandListShadingRate, Primitive->PrimitiveSpecifiedShadingRate);
finalRate = ApplyCombiner(Combiners[1], postRasterizerRate, ScreenSpaceImage[xy]);

UINT ApplyCombiner(D3D12_SHADING_RATE_COMBINER combiner, UINT a, UINT b)
{
MaxShadingRate = options6.AdditionalShadingRatesSupported ? 4 : 2;
switch (combiner)
{
case D3D12_SHADING_RATE_COMBINER_PASSTHROUGH: // default
return a;
case D3D12_SHADING_RATE_COMBINER_OVERRIDE:
return b;
case D3D12_SHADING_RATE_COMBINER_MAX:
return max(a, b);
case D3D12_SHADING_RATE_COMBINER_MIN:
return min(a, b);
case D3D12_SHADING_RATE_COMBINER_SUM:
return min(MaxShadingRate, a + b);
case default:
return a;
}
}