export default /* glsl */`
#ifdef USE_SHADOWMAP

	#if NUM_DIR_LIGHT_SHADOWS > 0 || NUM_SPOT_LIGHT_SHADOWS > 0 || NUM_POINT_LIGHT_SHADOWS > 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 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_SPOT_LIGHT_SHADOWS > 0

	#pragma unroll_loop_start
	for ( int i = 0; i < NUM_SPOT_LIGHT_SHADOWS; i ++ ) {

		shadowWorldPosition = worldPosition + vec4( shadowWorldNormal * spotLightShadows[ i ].shadowNormalBias, 0 );
		vSpotShadowCoord[ i ] = spotShadowMatrix[ 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
`;