-vec3 specularReflection(PBRInfo pbrInputs)
-{
- return pbrInputs.reflectance0 + (pbrInputs.reflectance90 - pbrInputs.reflectance0) * pow(clamp(1.0 - pbrInputs.VdotH, 0.0, 1.0), 5.0);
-}
-
-float geometricOcclusion(PBRInfo pbrInputs)
-{
- mediump float NdotL = pbrInputs.NdotL;
- mediump float NdotV = pbrInputs.NdotV;
- lowp float r = pbrInputs.alphaRoughness;
-
- lowp float attenuationL = 2.0 * NdotL / (NdotL + sqrt(r * r + (1.0 - r * r) * (NdotL * NdotL)));
- lowp float attenuationV = 2.0 * NdotV / (NdotV + sqrt(r * r + (1.0 - r * r) * (NdotV * NdotV)));
- return attenuationL * attenuationV;
-}
-
-float microfacetDistribution(PBRInfo pbrInputs)
-{
- mediump float roughnessSq = pbrInputs.alphaRoughness * pbrInputs.alphaRoughness;
- lowp float f = (pbrInputs.NdotH * roughnessSq - pbrInputs.NdotH) * pbrInputs.NdotH + 1.0;
- return roughnessSq / (M_PI * f * f);
-}
-