Support specular attenuation of environment maps (#22319)

src/renderers/shaders/ShaderChunk/bsdfs.glsl.js

@@ -236,26 +236,26 @@ vec3 LTC_Evaluate( const in vec3 N, const in vec3 V, const in vec3 P, const in m
 // End Rect Area Light
 
 // ref: https://www.unrealengine.com/blog/physically-based-shading-on-mobile - environmentBRDF for GGX on mobile
-vec3 BRDF_Specular_GGX_Environment( const in vec3 viewDir, const in vec3 normal, const in vec3 specularColor, const in float roughness ) {
+vec3 BRDF_Specular_GGX_Environment( const in vec3 viewDir, const in vec3 normal, const in vec3 specularColor, const in float specularF90, const in float roughness ) {
 
 	float dotNV = saturate( dot( normal, viewDir ) );
 
 	vec2 brdf = integrateSpecularBRDF( dotNV, roughness );
 
-	return specularColor * brdf.x + brdf.y;
+	return specularColor * brdf.x + specularF90 * brdf.y;
 
 } // validated
 
 // Fdez-Agüera's "Multiple-Scattering Microfacet Model for Real-Time Image Based Lighting"
 // Approximates multiscattering in order to preserve energy.
 // http://www.jcgt.org/published/0008/01/03/
-void BRDF_Specular_Multiscattering_Environment( const in GeometricContext geometry, const in vec3 specularColor, const in float roughness, inout vec3 singleScatter, inout vec3 multiScatter ) {
+void BRDF_Specular_Multiscattering_Environment( const in GeometricContext geometry, const in vec3 specularColor, const in float specularF90, const in float roughness, inout vec3 singleScatter, inout vec3 multiScatter ) {
 
 	float dotNV = saturate( dot( geometry.normal, geometry.viewDir ) );
 
 	vec2 brdf = integrateSpecularBRDF( dotNV, roughness );
 
-	vec3 FssEss = specularColor * brdf.x + brdf.y;
+	vec3 FssEss = specularColor * brdf.x + specularF90 * brdf.y;
 
 	float Ess = brdf.x + brdf.y;
 	float Ems = 1.0 - Ess;

src/renderers/shaders/ShaderChunk/lights_physical_pars_fragment.glsl.js

@@ -131,7 +131,7 @@ void RE_IndirectSpecular_Physical( const in vec3 radiance, const in vec3 irradia
 
 		float ccDotNV = saturate( dot( geometry.clearcoatNormal, geometry.viewDir ) );
 
-		reflectedLight.indirectSpecular += clearcoatRadiance * material.clearcoat * BRDF_Specular_GGX_Environment( geometry.viewDir, geometry.clearcoatNormal, vec3( DEFAULT_SPECULAR_COEFFICIENT ), material.clearcoatRoughness );
+		reflectedLight.indirectSpecular += clearcoatRadiance * material.clearcoat * BRDF_Specular_GGX_Environment( geometry.viewDir, geometry.clearcoatNormal, vec3( DEFAULT_SPECULAR_COEFFICIENT ), 1.0, material.clearcoatRoughness );
 
 		float ccDotNL = ccDotNV;
 		float clearcoatDHR = material.clearcoat * clearcoatDHRApprox( material.clearcoatRoughness, ccDotNL );
@@ -150,7 +150,7 @@ void RE_IndirectSpecular_Physical( const in vec3 radiance, const in vec3 irradia
 	vec3 multiScattering = vec3( 0.0 );
 	vec3 cosineWeightedIrradiance = irradiance * RECIPROCAL_PI;
 
-	BRDF_Specular_Multiscattering_Environment( geometry, material.specularColor, material.specularRoughness, singleScattering, multiScattering );
+	BRDF_Specular_Multiscattering_Environment( geometry, material.specularColor, material.specularF90, material.specularRoughness, singleScattering, multiScattering );
 
 	vec3 diffuse = material.diffuseColor * ( 1.0 - ( singleScattering + multiScattering ) );