Sebastien Lagarde
7 年前
当前提交
0cdbadfa
共有 7 个文件被更改，包括 57 次插入 和 90 次删除
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2ScriptableRenderPipeline/Core/ShaderLibrary/API/D3D11.hlsl
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2ScriptableRenderPipeline/Core/ShaderLibrary/API/Metal.hlsl
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2ScriptableRenderPipeline/Core/ShaderLibrary/API/PSSL.hlsl
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2ScriptableRenderPipeline/Core/ShaderLibrary/API/Vulkan.hlsl
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97ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.hlsl
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42ScriptableRenderPipeline/HDRenderPipeline/Material/SubsurfaceScattering/SubsurfaceScatteringUtilities.hlsl
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// To use in case the color have already been encoded in checkboard YCoCg |
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float4 EncodeSSSDataToBuffer(float2 Ychroma, float subsurfaceRadius, uint subsurfaceProfile, float thickness) |
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{ |
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// subsurfaceRadius is like a mask (a bit like metal parameters and don't need a lot of precision, store it on 4 bit |
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// currently we support up to 16 SSS profile (SSS_N_PROFILES) - caution if this number change (for a higher value), code below must change! |
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return float4(Ychroma, thickness, PackFloatInt8bit(subsurfaceRadius, subsurfaceProfile, 16.0)); |
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} |
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// This function encode all data require for ScreenSpace SubsurfaceScattering (SSSSS) |
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// Aim to be use with a GBuffer |
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float4 EncodeSSSDataToBuffer(float3 color, float subsurfaceRadius, uint subsurfaceProfile, float thickness, uint2 positionSS) |
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{ |
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// RGBToYCoCg have better precision with a sRGB color, use cheap gamma 2 instead |
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// Take care that the render target use linear format |
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float3 YCoCg = RGBToYCoCg(LinearToGamma20(color)); |
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// Note: when we are in forward we don't need to store the thickness as it is already apply. So a potential optimization |
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// when we know that we are in full forward only is to not store the thickness and store the full baseColor (so not cost at decode) |
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// as this function aim to be share between hybrid deferred/forward, we can't assume it. |
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// subsurfaceRadius is like a mask (a bit like metal parameters and don't need a lot of precision, store it on 4 bit |
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// currently we support up to 16 SSS profile (SSS_N_PROFILES) - caution if this number change (for a higher value), code below must change! |
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return EncodeSSSDataToBuffer((positionSS.x & 1) == (positionSS.y & 1) ? YCoCg.rb : YCoCg.rg, subsurfaceRadius, thickness, subsurfaceProfile, thickness); |
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} |
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float4 DecodeSSSDataFromBuffer(TEXTURE2D_ARGS_NOSAMPLER(SSSBuffer), uint2 positionSS, float4 inBuffer, out float3 color, out float subsurfaceRadius, out int subsurfaceProfileout, out float thickness) |
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{ |
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// unpack |
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float2 YChroma0 = inBuffer.rg; |
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thickness = inBuffer.b; |
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UnpackFloatInt8bit(inBuffer.a, 16.0, subsurfaceRadius, subsurfaceProfile); |
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// Reconstruct color |
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// Note: We don't care about pixel at border, will be handled by the edge filter (as it will be black) |
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float2 a0 = LOAD_TEXTURE2D(SSSBuffer, positionSS + uint2(1, 0)).rg; |
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float2 a1 = LOAD_TEXTURE2D(SSSBuffer, positionSS - uint2(1, 0)).rg; |
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float2 a2 = LOAD_TEXTURE2D(SSSBuffer, positionSS + uint2(0, 1)).rg; |
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float2 a3 = LOAD_TEXTURE2D(SSSBuffer, positionSS - uint2(0, 1)).rg; |
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float chroma1 = YCoCgCheckBoardEdgeFilter(YChroma0.r, a0, a1, a2, a3); |
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float3 YCoCg = (positionSS.x & 1) == (positionSS.y & 1) ? float3(YChroma0.r, chroma1, YChroma0.g) : float3(YChroma0.rg, chroma1); |
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color = Gamma20ToLinear(YCoCgToRGB(YCoCg)); |
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} |
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