export default /* glsl */`
#if ( defined( USE_SHADOWMAP ) && ( NUM_DIR_LIGHT_SHADOWS > 0 || NUM_POINT_LIGHT_SHADOWS > 0 ) ) || ( NUM_SPOT_LIGHT_COORDS > 0 )
// Offsetting the position used for querying occlusion along the world normal can be used to reduce shadow acne.
vec3 shadowWorldNormal = inverseTransformDirection( transformedNormal, viewMatrix );
vec4 shadowWorldPosition;
#endif
#if defined( USE_SHADOWMAP )
#if NUM_DIR_LIGHT_SHADOWS > 0
#pragma unroll_loop_start
for ( int i = 0; i < NUM_DIR_LIGHT_SHADOWS; i ++ ) {
shadowWorldPosition = worldPosition + vec4( shadowWorldNormal * directionalLightShadows[ i ].shadowNormalBias, 0 );
vDirectionalShadowCoord[ i ] = directionalShadowMatrix[ i ] * shadowWorldPosition;
}
#pragma unroll_loop_end
#endif
#if NUM_POINT_LIGHT_SHADOWS > 0
#pragma unroll_loop_start
for ( int i = 0; i < NUM_POINT_LIGHT_SHADOWS; i ++ ) {
shadowWorldPosition = worldPosition + vec4( shadowWorldNormal * pointLightShadows[ i ].shadowNormalBias, 0 );
vPointShadowCoord[ i ] = pointShadowMatrix[ i ] * shadowWorldPosition;
}
#pragma unroll_loop_end
#endif
/*
#if NUM_RECT_AREA_LIGHTS > 0
// TODO (abelnation): update vAreaShadowCoord with area light info
#endif
*/
#endif
// spot lights can be evaluated without active shadow mapping (when SpotLight.map is used)
#if NUM_SPOT_LIGHT_COORDS > 0
#pragma unroll_loop_start
for ( int i = 0; i < NUM_SPOT_LIGHT_COORDS; i ++ ) {
shadowWorldPosition = worldPosition;
#if ( defined( USE_SHADOWMAP ) && UNROLLED_LOOP_INDEX < NUM_SPOT_LIGHT_SHADOWS )
shadowWorldPosition.xyz += shadowWorldNormal * spotLightShadows[ i ].shadowNormalBias;
#endif
vSpotLightCoord[ i ] = spotLightMatrix[ i ] * shadowWorldPosition;
}
#pragma unroll_loop_end
#endif
`;