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

124 lines
3.3 KiB
GLSL

/**
* This is a template that can be used to light a material, it uses pluggable
* RenderEquations (RE)for specific lighting scenarios.
*
* Instructions for use:
* - Ensure that both RE_Direct, RE_IndirectDiffuse and RE_IndirectSpecular are defined
* - If you have defined an RE_IndirectSpecular, you need to also provide a Material_LightProbeLOD. <---- ???
* - Create a material parameter that is to be passed as the third parameter to your lighting functions.
*
* TODO:
* - Add area light support.
* - Add sphere light support.
* - Add diffuse light probe (irradiance cubemap) support.
*/
GeometricContext geometry;
geometry.position = - vViewPosition;
geometry.normal = normal;
geometry.viewDir = normalize( vViewPosition );
IncidentLight directLight;
#if ( NUM_POINT_LIGHTS > 0 ) && defined( RE_Direct )
PointLight pointLight;
#pragma unroll_loop
for ( int i = 0; i < NUM_POINT_LIGHTS; i ++ ) {
pointLight = pointLights[ i ];
getPointDirectLightIrradiance( pointLight, geometry, directLight );
#ifdef USE_SHADOWMAP
directLight.color *= all( bvec2( pointLight.shadow, directLight.visible ) ) ? getPointShadow( pointShadowMap[ i ], pointLight.shadowMapSize, pointLight.shadowBias, pointLight.shadowRadius, vPointShadowCoord[ i ], pointLight.shadowCameraNear, pointLight.shadowCameraFar ) : 1.0;
#endif
RE_Direct( directLight, geometry, material, reflectedLight );
}
#endif
#if ( NUM_SPOT_LIGHTS > 0 ) && defined( RE_Direct )
SpotLight spotLight;
#pragma unroll_loop
for ( int i = 0; i < NUM_SPOT_LIGHTS; i ++ ) {
spotLight = spotLights[ i ];
getSpotDirectLightIrradiance( spotLight, geometry, directLight );
#ifdef USE_SHADOWMAP
directLight.color *= all( bvec2( spotLight.shadow, directLight.visible ) ) ? getShadow( spotShadowMap[ i ], spotLight.shadowMapSize, spotLight.shadowBias, spotLight.shadowRadius, vSpotShadowCoord[ i ] ) : 1.0;
#endif
RE_Direct( directLight, geometry, material, reflectedLight );
}
#endif
#if ( NUM_DIR_LIGHTS > 0 ) && defined( RE_Direct )
DirectionalLight directionalLight;
#pragma unroll_loop
for ( int i = 0; i < NUM_DIR_LIGHTS; i ++ ) {
directionalLight = directionalLights[ i ];
getDirectionalDirectLightIrradiance( directionalLight, geometry, directLight );
#ifdef USE_SHADOWMAP
directLight.color *= all( bvec2( directionalLight.shadow, directLight.visible ) ) ? getShadow( directionalShadowMap[ i ], directionalLight.shadowMapSize, directionalLight.shadowBias, directionalLight.shadowRadius, vDirectionalShadowCoord[ i ] ) : 1.0;
#endif
RE_Direct( directLight, geometry, material, reflectedLight );
}
#endif
#if ( NUM_RECT_AREA_LIGHTS > 0 ) && defined( RE_Direct_RectArea )
RectAreaLight rectAreaLight;
#pragma unroll_loop
for ( int i = 0; i < NUM_RECT_AREA_LIGHTS; i ++ ) {
rectAreaLight = rectAreaLights[ i ];
RE_Direct_RectArea( rectAreaLight, geometry, material, reflectedLight );
}
#endif
#if defined( RE_IndirectDiffuse )
vec3 irradiance = getAmbientLightIrradiance( ambientLightColor );
#if ( NUM_HEMI_LIGHTS > 0 )
#pragma unroll_loop
for ( int i = 0; i < NUM_HEMI_LIGHTS; i ++ ) {
irradiance += getHemisphereLightIrradiance( hemisphereLights[ i ], geometry );
}
#endif
#endif
#if defined( RE_IndirectSpecular )
vec3 radiance = vec3( 0.0 );
vec3 clearCoatRadiance = vec3( 0.0 );
#endif