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82 lines
3.3 KiB
82 lines
3.3 KiB
float3 SampleSpecularBRDF(BSDFData bsdfData, float2 theSample, float3 viewWS)
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{
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float roughness = PerceptualRoughnessToRoughness(bsdfData.perceptualRoughness);
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float3x3 localToWorld;
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if (HasFlag(bsdfData.materialFeatures, MATERIALFEATUREFLAGS_LIT_ANISOTROPY))
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{
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localToWorld = float3x3(bsdfData.tangentWS, bsdfData.bitangentWS, bsdfData.normalWS);
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}
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else
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{
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localToWorld = GetLocalFrame(bsdfData.normalWS);
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}
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float NdotL, NdotH, VdotH;
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float3 sampleDir;
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SampleGGXDir(theSample, viewWS, localToWorld, roughness, sampleDir, NdotL, NdotH, VdotH);
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return sampleDir;
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}
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#ifdef HAS_LIGHTLOOP
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IndirectLighting EvaluateBSDF_RaytracedReflection(LightLoopContext lightLoopContext,
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BSDFData bsdfData,
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PreLightData preLightData,
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float3 reflection)
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{
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IndirectLighting lighting;
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ZERO_INITIALIZE(IndirectLighting, lighting);
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lighting.specularReflected = reflection.rgb * preLightData.specularFGD;
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return lighting;
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}
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IndirectLighting EvaluateBSDF_RaytracedRefraction(LightLoopContext lightLoopContext,
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PreLightData preLightData,
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float3 transmittedColor)
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{
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IndirectLighting lighting;
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ZERO_INITIALIZE(IndirectLighting, lighting);
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#if HAS_REFRACTION
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float3 preLD = transmittedColor;
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// We use specularFGD as an approximation of the fresnel effect (that also handle smoothness)
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float3 F = preLightData.specularFGD;
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lighting.specularTransmitted = (1.0 - F) * preLD.rgb * preLightData.transparentTransmittance;
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#endif
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return lighting;
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}
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float RecursiveRenderingReflectionPerceptualSmoothness(BSDFData bsdfData)
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{
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return PerceptualRoughnessToPerceptualSmoothness(bsdfData.perceptualRoughness);
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}
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#if HAS_REFRACTION
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void OverrideRefractionData(SurfaceData surfaceData, float refractionDistance, float3 refractionPositionWS, inout BSDFData bsdfData, inout PreLightData preLightData)
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{
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// This variable is only used for SSRefraction, we intentionally put an invalid value in it.
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bsdfData.absorptionCoefficient = TransmittanceColorAtDistanceToAbsorption(surfaceData.transmittanceColor, refractionDistance);
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preLightData.transparentRefractV = 0.0;
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preLightData.transparentPositionWS = refractionPositionWS;
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preLightData.transparentTransmittance = exp(-bsdfData.absorptionCoefficient * refractionDistance);
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}
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#endif
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#endif
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#if (SHADERPASS == SHADERPASS_RAYTRACING_GBUFFER)
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void FitToStandardLit( BSDFData bsdfData
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, BuiltinData builtinData
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, uint2 positionSS
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, inout StandardBSDFData outStandardlit)
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{
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outStandardlit.specularOcclusion = bsdfData.specularOcclusion;
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outStandardlit.normalWS = bsdfData.normalWS;
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outStandardlit.baseColor = bsdfData.diffuseColor;
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outStandardlit.fresnel0 = bsdfData.fresnel0;
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outStandardlit.perceptualRoughness = bsdfData.perceptualRoughness;
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outStandardlit.coatMask = bsdfData.coatMask;
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outStandardlit.emissiveAndBaked = builtinData.bakeDiffuseLighting * bsdfData.ambientOcclusion + builtinData.emissiveColor;
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outStandardlit.isUnlit = 0;
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}
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#endif
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