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31 行
1.2 KiB
31 行
1.2 KiB
#include "Decal.hlsl"
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DECLARE_DBUFFER_TEXTURE(_DBufferTexture);
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void AddDecalContribution(uint2 unPositionSS, inout SurfaceData surfaceData)
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{
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if(_EnableDBuffer)
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{
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// the code in the macros, gets moved inside the conditionals by the compiler
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FETCH_DBUFFER(DBuffer, _DBufferTexture, unPositionSS);
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DecalSurfaceData decalSurfaceData;
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DECODE_FROM_DBUFFER(DBuffer, decalSurfaceData);
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uint mask = UnpackByte(_DecalHTile[unPositionSS / 8]);
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// using alpha compositing https://developer.nvidia.com/gpugems/GPUGems3/gpugems3_ch23.html
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if(mask & DBUFFERHTILEBIT_DIFFUSE)
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{
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surfaceData.baseColor.xyz = surfaceData.baseColor.xyz * decalSurfaceData.baseColor.w + decalSurfaceData.baseColor.xyz;
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}
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if(mask & DBUFFERHTILEBIT_NORMAL)
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{
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surfaceData.normalWS.xyz = normalize(surfaceData.normalWS.xyz * decalSurfaceData.normalWS.w + decalSurfaceData.normalWS.xyz);
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}
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if(mask & DBUFFERHTILEBIT_MASK)
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{
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surfaceData.metallic = surfaceData.metallic * decalSurfaceData.mask.w + decalSurfaceData.mask.x;
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surfaceData.ambientOcclusion = surfaceData.ambientOcclusion * decalSurfaceData.mask.w + decalSurfaceData.mask.y;
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surfaceData.perceptualSmoothness = surfaceData.perceptualSmoothness * decalSurfaceData.mask.w + decalSurfaceData.mask.z;
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}
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}
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}
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