Shaders: Remove outdated code in Physical Material fragment shader (#22234)

* Clean up

* Remove outdated support for ENVMAP_TYPE_CUBE

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

@@ -2,102 +2,59 @@ export default /* glsl */`
 #if defined( USE_ENVMAP )
 
 	#ifdef ENVMAP_MODE_REFRACTION
-		uniform float refractionRatio;
-	#endif
-
-	vec3 getLightProbeIndirectIrradiance( /*const in SpecularLightProbe specularLightProbe,*/ const in GeometricContext geometry, const in int maxMIPLevel ) {
-
-		vec3 worldNormal = inverseTransformDirection( geometry.normal, viewMatrix );
-
-		#ifdef ENVMAP_TYPE_CUBE
-
-			vec3 queryVec = vec3( flipEnvMap * worldNormal.x, worldNormal.yz );
-
-			// TODO: replace with properly filtered cubemaps and access the irradiance LOD level, be it the last LOD level
-			// of a specular cubemap, or just the default level of a specially created irradiance cubemap.
-
-			#ifdef TEXTURE_LOD_EXT
-
-				vec4 envMapColor = textureCubeLodEXT( envMap, queryVec, float( maxMIPLevel ) );
 
-			#else
+		uniform float refractionRatio;
 
-				// force the bias high to get the last LOD level as it is the most blurred.
-				vec4 envMapColor = textureCube( envMap, queryVec, float( maxMIPLevel ) );
+	#endif
 
-			#endif
+	vec3 getLightProbeIndirectIrradiance( const in GeometricContext geometry, const in int maxMIPLevel ) {
 
-			envMapColor.rgb = envMapTexelToLinear( envMapColor ).rgb;
+		#if defined( ENVMAP_TYPE_CUBE_UV )
 
-		#elif defined( ENVMAP_TYPE_CUBE_UV )
+			vec3 worldNormal = inverseTransformDirection( geometry.normal, viewMatrix );
 
 			vec4 envMapColor = textureCubeUV( envMap, worldNormal, 1.0 );
 
+			return PI * envMapColor.rgb * envMapIntensity;
+
 		#else
 
-			vec4 envMapColor = vec4( 0.0 );
+			return vec3( 0.0 );
 
 		#endif
 
-		return PI * envMapColor.rgb * envMapIntensity;
-
-	}
-
-	// Trowbridge-Reitz distribution to Mip level, following the logic of http://casual-effects.blogspot.ca/2011/08/plausible-environment-lighting-in-two.html
-	float getSpecularMIPLevel( const in float roughness, const in int maxMIPLevel ) {
-
-		float maxMIPLevelScalar = float( maxMIPLevel );
-
-		float sigma = PI * roughness * roughness / ( 1.0 + roughness );
-		float desiredMIPLevel = maxMIPLevelScalar + log2( sigma );
-
-		// clamp to allowable LOD ranges.
-		return clamp( desiredMIPLevel, 0.0, maxMIPLevelScalar );
-
 	}
 
-	vec3 getLightProbeIndirectRadiance( /*const in SpecularLightProbe specularLightProbe,*/ const in vec3 viewDir, const in vec3 normal, const in float roughness, const in int maxMIPLevel ) {
-
-		#ifdef ENVMAP_MODE_REFLECTION
-
-			vec3 reflectVec = reflect( -viewDir, normal );
-
-			// Mixing the reflection with the normal is more accurate and keeps rough objects from gathering light from behind their tangent plane.
-			reflectVec = normalize( mix( reflectVec, normal, roughness * roughness) );
-
-		#else
-
-			vec3 reflectVec = refract( -viewDir, normal, refractionRatio );
+	vec3 getLightProbeIndirectRadiance( const in vec3 viewDir, const in vec3 normal, const in float roughness, const in int maxMIPLevel ) {
 
-		#endif
-
-		reflectVec = inverseTransformDirection( reflectVec, viewMatrix );
-
-		float specularMIPLevel = getSpecularMIPLevel( roughness, maxMIPLevel );
+		#if defined( ENVMAP_TYPE_CUBE_UV )
 
-		#ifdef ENVMAP_TYPE_CUBE
+			vec3 reflectVec;
 
-			vec3 queryReflectVec = vec3( flipEnvMap * reflectVec.x, reflectVec.yz );
+			#ifdef ENVMAP_MODE_REFLECTION
 
-			#ifdef TEXTURE_LOD_EXT
+				reflectVec = reflect( - viewDir, normal );
 
-				vec4 envMapColor = textureCubeLodEXT( envMap, queryReflectVec, specularMIPLevel );
+				// Mixing the reflection with the normal is more accurate and keeps rough objects from gathering light from behind their tangent plane.
+				reflectVec = normalize( mix( reflectVec, normal, roughness * roughness) );
 
 			#else
 
-				vec4 envMapColor = textureCube( envMap, queryReflectVec, specularMIPLevel );
+				reflectVec = refract( - viewDir, normal, refractionRatio );
 
 			#endif
 
-			envMapColor.rgb = envMapTexelToLinear( envMapColor ).rgb;
-
-		#elif defined( ENVMAP_TYPE_CUBE_UV )
+			reflectVec = inverseTransformDirection( reflectVec, viewMatrix );
 
 			vec4 envMapColor = textureCubeUV( envMap, reflectVec, roughness );
 
-		#endif
+			return envMapColor.rgb * envMapIntensity;
 
-		return envMapColor.rgb * envMapIntensity;
+		#else
+
+			return vec3( 0.0 );
+
+		#endif
 
 	}