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31 行
1.0 KiB
31 行
1.0 KiB
#ifndef LIGHTWEIGHT_BRDF_INCLUDED
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#define LIGHTWEIGHT_BRDF_INCLUDED
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half MetallicSetup_Reflectivity()
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{
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return 1.0h - OneMinusReflectivityFromMetallic(_Metallic);
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}
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//sampler2D unity_NHxRoughness;
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half3 LightweightBRDFDirect(half3 diffColor, half3 specColor, half smoothness, half RdotL)
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{
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#if SPECULAR_HIGHLIGHTS
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half RdotLPow4 = Pow4(RdotL);
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half LUT_RANGE = 16.0; // must match range in NHxRoughness() function in GeneratedTextures.cpp
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// Lookup texture to save instructions
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half perceptualRoughness = 1.0 - smoothness;
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half specular = tex2D(unity_NHxRoughness, half2(RdotLPow4, perceptualRoughness)).UNITY_ATTEN_CHANNEL * LUT_RANGE;
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return diffColor + specular * specColor;
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#else
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return diffColor;
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#endif
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}
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half3 LightweightBRDFIndirect(half3 diffColor, half3 specColor, UnityIndirect indirect, half grazingTerm, half fresnelTerm)
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{
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half3 c = indirect.diffuse * diffColor;
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c += indirect.specular * lerp(specColor, grazingTerm, fresnelTerm);
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return c;
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}
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#endif
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