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88 行
3.1 KiB
88 行
3.1 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 "LightweightShadows.cginc"
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#if defined(_SPECGLOSSMAP) || defined(_SPECULAR_COLOR)
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#define LIGHTWEIGHT_SPECULAR_HIGHLIGHTS
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#endif
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#define kDieletricSpec 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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inline void InitializeSurfaceData(LightweightVertexOutput i, out SurfaceData outSurfaceData)
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{
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float2 uv = i.uv01.xy;
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half4 albedoAlpha = tex2D(_MainTex, uv);
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outSurfaceData.albedo = LIGHTWEIGHT_GAMMA_TO_LINEAR(albedoAlpha.rgb) * _Color.rgb;
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outSurfaceData.alpha = Alpha(albedoAlpha.a);
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outSurfaceData.metallicSpecGloss = MetallicSpecGloss(uv, albedoAlpha);
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outSurfaceData.normalWorld = Normal(i);
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outSurfaceData.ao = OcclusionLW(uv);
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outSurfaceData.emission = EmissionLW(uv);
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}
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inline void InitializeBRDFData(SurfaceData surfaceData, out BRDFData outBRDFData)
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{
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// BRDF SETUP
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#ifdef _METALLIC_SETUP
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half2 metallicGloss = surfaceData.metallicSpecGloss.ra;
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half metallic = metallicGloss.r;
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half 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 kDieletricSpec.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 = kDieletricSpec.a;
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half oneMinusReflectivity = oneMinusDielectricSpec - metallic * oneMinusDielectricSpec;
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half reflectivity = 1.0 - oneMinusReflectivity;
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outBRDFData.diffuse = surfaceData.albedo * oneMinusReflectivity;
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outBRDFData.specular = lerp(kDieletricSpec.rgb, surfaceData.albedo, metallic);
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#else
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half3 specular = surfaceData.metallicSpecGloss.rgb;
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half smoothness = surfaceData.metallicSpecGloss.a;
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half reflectivity = SpecularReflectivity(specular);
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outBRDFData.diffuse = surfaceData.albedo * (half3(1.0h, 1.0h, 1.0h) - specular);
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outBRDFData.specular = specular;
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#endif
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outBRDFData.grazingTerm = saturate(smoothness + reflectivity);
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outBRDFData.perceptualRoughness = 1.0h - smoothness;
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outBRDFData.roughness = outBRDFData.perceptualRoughness * outBRDFData.perceptualRoughness;
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#ifdef _ALPHAPREMULTIPLY_ON
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half alpha = surfaceData.alpha;
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outBRDFData.diffuse *= alpha;
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surfaceData.alpha = reflectivity + alpha * (1.0 - reflectivity);
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#endif
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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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