38 lines
949 B
HLSL
38 lines
949 B
HLSL
uniform float4 screen_res;
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uniform sampler2D s_occ;
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float ssao_blur_ps(float2 centerTC)
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{
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// low weight center sample - will be used on edges
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float fSumWeight = 0.025f;
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float2 centerData = tex2D(s_occ, centerTC);
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float fOcclusion = centerData.r * fSumWeight;
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float centerDepth = centerData.g;
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float2 arrOffsets[4] =
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{
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float2(1, -1),
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float2(-1, -1),
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float2(1, 1),
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float2(-1, 1)
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};
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for (int i = 0; i < 4; i++)
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{
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float2 sampleTC = centerTC + screen_res.zw * arrOffsets[i];
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float2 sampleData = tex2D(s_occ, sampleTC);
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float fDepth = sampleData.g;
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float fDiff = 8 * abs(fDepth - centerDepth) / min(fDepth, centerDepth);
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float fWeight = saturate(1 - fDiff);
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fOcclusion += sampleData.r * fWeight;
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fSumWeight += fWeight;
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}
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fOcclusion /= fSumWeight;
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return fOcclusion;
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}
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