fireball/lib/renderers/shaders/ShaderChunk/envmap_fragment.glsl
2018-12-25 17:29:22 +03:30

73 lines
1.7 KiB
GLSL

#ifdef USE_ENVMAP
#if defined( USE_BUMPMAP ) || defined( USE_NORMALMAP ) || defined( PHONG )
vec3 cameraToVertex = normalize( vWorldPosition - cameraPosition );
// Transforming Normal Vectors with the Inverse Transformation
vec3 worldNormal = inverseTransformDirection( normal, viewMatrix );
#ifdef ENVMAP_MODE_REFLECTION
vec3 reflectVec = reflect( cameraToVertex, worldNormal );
#else
vec3 reflectVec = refract( cameraToVertex, worldNormal, refractionRatio );
#endif
#else
vec3 reflectVec = vReflect;
#endif
#ifdef ENVMAP_TYPE_CUBE
vec4 envColor = textureCube( envMap, vec3( flipEnvMap * reflectVec.x, reflectVec.yz ) );
#elif defined( ENVMAP_TYPE_EQUIREC )
vec2 sampleUV;
reflectVec = normalize( reflectVec );
sampleUV.y = asin( clamp( reflectVec.y, - 1.0, 1.0 ) ) * RECIPROCAL_PI + 0.5;
sampleUV.x = atan( reflectVec.z, reflectVec.x ) * RECIPROCAL_PI2 + 0.5;
vec4 envColor = texture2D( envMap, sampleUV );
#elif defined( ENVMAP_TYPE_SPHERE )
reflectVec = normalize( reflectVec );
vec3 reflectView = normalize( ( viewMatrix * vec4( reflectVec, 0.0 ) ).xyz + vec3( 0.0, 0.0, 1.0 ) );
vec4 envColor = texture2D( envMap, reflectView.xy * 0.5 + 0.5 );
#else
vec4 envColor = vec4( 0.0 );
#endif
envColor = envMapTexelToLinear( envColor );
#ifdef ENVMAP_BLENDING_MULTIPLY
outgoingLight = mix( outgoingLight, outgoingLight * envColor.xyz, specularStrength * reflectivity );
#elif defined( ENVMAP_BLENDING_MIX )
outgoingLight = mix( outgoingLight, envColor.xyz, specularStrength * reflectivity );
#elif defined( ENVMAP_BLENDING_ADD )
outgoingLight += envColor.xyz * specularStrength * reflectivity;
#endif
#endif