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73 行
2.5 KiB
73 行
2.5 KiB
#ifndef LIGHTWEIGHT_PIPELINE_CORE_INCLUDED
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#define LIGHTWEIGHT_PIPELINE_CORE_INCLUDED
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#include "LightweightInput.cginc"
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#include "LightweightLighting.cginc"
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#include "LightweightBRDF.cginc"
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#if defined(_HARD_SHADOWS) || defined(_SOFT_SHADOWS) || defined(_HARD_SHADOWS_CASCADES) || defined(_SOFT_SHADOWS_CASCADES)
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#define _SHADOWS
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#endif
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#if defined(_HARD_SHADOWS_CASCADES) || defined(_SOFT_SHADOWS_CASCADES)
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#define _SHADOW_CASCADES
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#endif
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#ifdef _SHADOWS
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#include "LightweightShadows.cginc"
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#endif
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#if defined(_SPECGLOSSMAP_BASE_ALPHA) || defined(_SPECGLOSSMAP) || defined(_SPECULAR_COLOR)
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#define LIGHTWEIGHT_SPECULAR_HIGHLIGHTS
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#endif
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#define _DieletricSpec half4(0.04, 0.04, 0.04, 1.0 - 0.04) // standard dielectric reflectivity coef at incident angle (= 4%)
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half SpecularReflectivity(half3 specular)
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{
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#if (SHADER_TARGET < 30)
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// SM2.0: instruction count limitation
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// SM2.0: simplified SpecularStrength
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return specular.r; // Red channel - because most metals are either monocrhome or with redish/yellowish tint
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#else
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return max(max(specular.r, specular.g), specular.b);
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#endif
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}
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half3 MetallicSetup(float2 uv, half3 albedo, half albedoAlpha, out half3 specular, out half smoothness, out half oneMinusReflectivity)
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{
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half2 metallicGloss = MetallicSpecGloss(uv, albedoAlpha).ra;
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half metallic = metallicGloss.r;
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smoothness = metallicGloss.g;
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// We'll need oneMinusReflectivity, so
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// 1-reflectivity = 1-lerp(dielectricSpec, 1, metallic) = lerp(1-dielectricSpec, 0, metallic)
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// store (1-dielectricSpec) in unity_ColorSpaceDielectricSpec.a, then
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// 1-reflectivity = lerp(alpha, 0, metallic) = alpha + metallic*(0 - alpha) =
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// = alpha - metallic * alpha
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half oneMinusDielectricSpec = _DieletricSpec.a;
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oneMinusReflectivity = oneMinusDielectricSpec - metallic * oneMinusDielectricSpec;
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specular = lerp(_DieletricSpec.rgb, albedo, metallic);
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return albedo * oneMinusReflectivity;
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}
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half3 SpecularSetup(float2 uv, half3 albedo, half albedoAlpha, out half3 specular, out half smoothness, out half oneMinusReflectivity)
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{
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half4 specGloss = MetallicSpecGloss(uv, albedoAlpha);
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specular = specGloss.rgb;
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smoothness = specGloss.a;
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oneMinusReflectivity = 1.0h - SpecularReflectivity(specular);
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return albedo * (half3(1, 1, 1) - specular);
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}
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half4 OutputColor(half3 color, half alpha)
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{
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#if defined(_ALPHABLEND_ON) || defined(_ALPHAPREMULTIPLY_ON)
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return LIGHTWEIGHT_LINEAR_TO_GAMMA(half4(color, alpha));
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#else
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return half4(LIGHTWEIGHT_LINEAR_TO_GAMMA(color), 1);
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#endif
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}
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#endif
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