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#include "LightweightCore.cginc" |
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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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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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outBRDFData.oneMinusReflectivity = oneMinusReflectivity; |
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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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outBRDFData.oneMinusReflectivity = 1.0h - reflectivity; |
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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 * oneMinusReflectivity; |
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#endif |
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} |
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LightweightVertexOutput LitPassVertex(LightweightVertexInput v) |
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{ |
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LightweightVertexOutput o = (LightweightVertexOutput)0; |
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#endif |
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half NdotL = saturate(dot(normal, lightDirection)); |
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half3 radiance = light.color * (lightAtten * NdotL); |
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color += LightweightBDRF(brdfData, roughness2, normal, lightDirection, i.viewDir.xyz) * radiance; |
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} |
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#endif |
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Felipe Lira
7 年前