three.js/src/renderers/shaders/ShaderChunk/shadowmap_pars_fragment.glsl

#ifdef USE_SHADOWMAP
	
	uniform sampler2D shadowMap[ MAX_SHADOWS ];
	uniform vec2 shadowMapSize[ MAX_SHADOWS ];

	uniform float shadowDarkness[ MAX_SHADOWS ];
	uniform float shadowBias[ MAX_SHADOWS ];

	varying vec4 vShadowCoord[ MAX_SHADOWS ];

	float unpackDepth( const in vec4 rgba_depth ) {

		const vec4 bit_shift = vec4( 1.0 / ( 256.0 * 256.0 * 256.0 ), 1.0 / ( 256.0 * 256.0 ), 1.0 / 256.0, 1.0 );
		float depth = dot( rgba_depth, bit_shift );
		return depth;

	}

	#if defined(POINT_LIGHT_SHADOWS)

		uniform samplerCube shadowCube[ MAX_SHADOWS ];

		vec4 pack1K ( float depth ) {
		
			depth /= 1000.0;
			const vec4 bitSh = vec4( 256.0 * 256.0 * 256.0, 256.0 * 256.0, 256.0, 1.0 );
	  		const vec4 bitMsk = vec4( 0.0, 1.0 / 256.0, 1.0 / 256.0, 1.0 / 256.0 );
	   		vec4 res = fract( depth * bitSh );
	   		res -= res.xxyz * bitMsk;
			return res;
			
		}

		float unpack1K ( vec4 color ) {
		
			const vec4 bitSh = vec4( 1.0 / (256.0 * 256.0 * 256.0), 1.0 / (256.0 * 256.0), 1.0 / 256.0, 1.0 );
			return dot( color, bitSh ) * 1000.0;
			
		}

		vec3 gridSamplingDisk[ 20 ];
		bool gridSamplingInitialized = false;

		void initGridSamplingDisk(){

			if( gridSamplingInitialized ){

				return;
				
			}

			gridSamplingDisk[0] = vec3(1, 1, 1);
			gridSamplingDisk[1] = vec3(1, -1, 1);
			gridSamplingDisk[2] = vec3(-1, -1, 1);
			gridSamplingDisk[3] = vec3(-1, 1, 1);
			gridSamplingDisk[4] = vec3(1, 1, -1);
			gridSamplingDisk[5] = vec3(1, -1, -1);
			gridSamplingDisk[6] = vec3(-1, -1, -1);
			gridSamplingDisk[7] = vec3(-1, 1, -1);
			gridSamplingDisk[8] = vec3(1, 1, 0);
			gridSamplingDisk[9] = vec3(1, -1, 0);
			gridSamplingDisk[10] = vec3(-1, -1, 0);
			gridSamplingDisk[11] = vec3(-1, 1, 0);
			gridSamplingDisk[12] = vec3(1, 0, 1);
			gridSamplingDisk[13] = vec3(-1, 0, 1);
			gridSamplingDisk[14] = vec3(1, 0, -1);
			gridSamplingDisk[15] = vec3(-1, 0, -1);
			gridSamplingDisk[16] = vec3(0, 1, 1);
			gridSamplingDisk[17] = vec3(0, -1, 1);
			gridSamplingDisk[18] = vec3(0, -1, -1);
			gridSamplingDisk[19] = vec3(0, 1, -1);

			gridSamplingInitialized = true;
			
		}

	#endif

#endif