52 lines
1.3 KiB
HLSL
52 lines
1.3 KiB
HLSL
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#ifndef LIMSSR_NORMAL_SAMPLE_INCLUDED
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#define LIMSSR_NORMAL_SAMPLE_INCLUDED
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#pragma multi_compile _ _GBUFFER_NORMALS_OCT
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//#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/Packing.hlsl"
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// Unpack 2 float of 12bit packed into a 888
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float2 Unpack888UIntToFloat2(uint3 x)
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{
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// 8 bit in lo, 4 bit in hi
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uint hi = x.z >> 4;
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uint lo = x.z & 15;
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uint2 cb = x.xy | uint2(lo << 8, hi << 8);
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return cb / 4095.0;
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}
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// Unpack 2 float of 12bit packed into a 888
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float2 Unpack888ToFloat2(float3 x)
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{
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uint3 i = (uint3) (x * 255.5); // +0.5 to fix precision error on iOS
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return Unpack888UIntToFloat2(i);
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}
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float3 UnpackNormalOctQuadEncode(float2 f)
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{
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float3 n = float3(f.x, f.y, 1.0 - abs(f.x) - abs(f.y));
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//float2 val = 1.0 - abs(n.yx);
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//n.xy = (n.zz < float2(0.0, 0.0) ? (n.xy >= 0.0 ? val : -val) : n.xy);
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// Optimized version of above code:
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float t = max(-n.z, 0.0);
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n.xy += n.xy >= 0.0 ? -t.xx : t.xx;
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return normalize(n);
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}
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float3 UnpackNormal(float3 normal)
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{
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#if defined(_GBUFFER_NORMALS_OCT)
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float2 remappedOctNormalWS = Unpack888ToFloat2(normal); // values between [ 0, 1]
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float2 octNormalWS = remappedOctNormalWS.xy * 2.0 - 1.0; // values between [-1, +1]
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normal = UnpackNormalOctQuadEncode(octNormalWS);
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#else
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normal = normalize(normal);
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#endif
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return normal;
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}
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#endif
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