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64 行
3.0 KiB
64 行
3.0 KiB
#include "CoreRP/ShaderLibrary/Packing.hlsl"
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#include "CoreRP/ShaderLibrary/CommonMaterial.hlsl"
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// ----------------------------------------------------------------------------
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// Encoding/decoding normal buffer functions
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// ----------------------------------------------------------------------------
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struct NormalData
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{
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float3 normalWS;
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float perceptualRoughness;
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};
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#define NormalBufferType0 float4 // Must match GBufferType1 in deferred
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// SSSBuffer texture declaration
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TEXTURE2D(_NormalBufferTexture0);
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void EncodeIntoNormalBuffer(NormalData normalData, uint2 positionSS, out NormalBufferType0 outNormalBuffer0)
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{
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// The sign of the Z component of the normal MUST round-trip through the G-Buffer, otherwise
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// the reconstruction of the tangent frame for anisotropic GGX creates a seam along the Z axis.
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// The constant was eye-balled to not cause artifacts.
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// TODO: find a proper solution. E.g. we could re-shuffle the faces of the octahedron
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// s.t. the sign of the Z component round-trips.
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const float seamThreshold = 1.0 / 1024.0;
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normalData.normalWS.z = CopySign(max(seamThreshold, abs(normalData.normalWS.z)), normalData.normalWS.z);
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// RT1 - 8:8:8:8
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// Our tangent encoding is based on our normal.
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#if defined(SHADER_API_METAL) || defined(SHADER_API_VULKAN)
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// With octahedral quad packing we get an artifact for reconstructed tangent at the center of this quad. We use rect packing instead to avoid it.
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float2 octNormalWS = PackNormalOctRectEncode(normalData.normalWS);
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#else
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float2 octNormalWS = PackNormalOctQuadEncode(normalData.normalWS);
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#endif
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float3 packNormalWS = PackFloat2To888(saturate(octNormalWS * 0.5 + 0.5));
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// We store perceptualRoughness instead of roughness because it is perceptually linear.
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outNormalBuffer0 = float4(packNormalWS, normalData.perceptualRoughness);
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}
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void DecodeFromNormalBuffer(float4 normalBuffer, uint2 positionSS, out NormalData normalData)
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{
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float3 packNormalWS = normalBuffer.rgb;
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float2 octNormalWS = Unpack888ToFloat2(packNormalWS);
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#if defined(SHADER_API_METAL) || defined(SHADER_API_VULKAN)
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normalData.normalWS = UnpackNormalOctRectEncode(octNormalWS * 2.0 - 1.0);
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#else
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normalData.normalWS = UnpackNormalOctQuadEncode(octNormalWS * 2.0 - 1.0);
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#endif
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normalData.perceptualRoughness = normalBuffer.a;
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}
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void DecodeFromNormalBuffer(uint2 positionSS, out NormalData normalData)
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{
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float4 normalBuffer = LOAD_TEXTURE2D(_NormalBufferTexture0, positionSS);
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DecodeFromNormalBuffer(normalBuffer, positionSS, normalData);
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}
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// OUTPUT_NORMAL_NORMALBUFFER start from SV_Target0 as it is used during depth prepass where there is no color buffer
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#define OUTPUT_NORMALBUFFER(NAME) out NormalBufferType0 MERGE_NAME(NAME, 0) : SV_Target0
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#define ENCODE_INTO_NORMALBUFFER(SURFACE_DATA, UNPOSITIONSS, NAME) EncodeIntoNormalBuffer(ConvertSurfaceDataToNormalData(SURFACE_DATA), UNPOSITIONSS, MERGE_NAME(NAME, 0))
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#define DECODE_FROM_NORMALBUFFER(UNPOSITIONSS, NORMAL_DATA) DecodeFromNormalBuffer(UNPOSITIONSS, NORMAL_DATA)
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