three.js/examples/js/shaders/ACESFilmicToneMappingShader.js

( function () {

	/**
 * ACES Filmic Tone Mapping Shader by Stephen Hill
 * source: https://github.com/selfshadow/ltc_code/blob/master/webgl/shaders/ltc/ltc_blit.fs
 *
 * this implementation of ACES is modified to accommodate a brighter viewing environment.
 * the scale factor of 1/0.6 is subjective. see discussion in #19621.
 */
	var ACESFilmicToneMappingShader = {
		uniforms: {
			'tDiffuse': {
				value: null
			},
			'exposure': {
				value: 1.0
			}
		},
		vertexShader: [ 'varying vec2 vUv;', 'void main() {', '	vUv = uv;', '	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );', '}' ].join( '\n' ),
		fragmentShader: [ '#define saturate(a) clamp( a, 0.0, 1.0 )', 'uniform sampler2D tDiffuse;', 'uniform float exposure;', 'varying vec2 vUv;', 'vec3 RRTAndODTFit( vec3 v ) {', '	vec3 a = v * ( v + 0.0245786 ) - 0.000090537;', '	vec3 b = v * ( 0.983729 * v + 0.4329510 ) + 0.238081;', '	return a / b;', '}', 'vec3 ACESFilmicToneMapping( vec3 color ) {', // sRGB => XYZ => D65_2_D60 => AP1 => RRT_SAT
			'	const mat3 ACESInputMat = mat3(', '		vec3( 0.59719, 0.07600, 0.02840 ),', // transposed from source
			'		vec3( 0.35458, 0.90834, 0.13383 ),', '		vec3( 0.04823, 0.01566, 0.83777 )', '	);', // ODT_SAT => XYZ => D60_2_D65 => sRGB
			'	const mat3 ACESOutputMat = mat3(', '		vec3(	1.60475, -0.10208, -0.00327 ),', // transposed from source
			'		vec3( -0.53108,	1.10813, -0.07276 ),', '		vec3( -0.07367, -0.00605,	1.07602 )', '	);', '	color = ACESInputMat * color;', // Apply RRT and ODT
			'	color = RRTAndODTFit( color );', '	color = ACESOutputMat * color;', // Clamp to [0, 1]
			'	return saturate( color );', '}', 'void main() {', '	vec4 tex = texture2D( tDiffuse, vUv );', '	tex.rgb *= exposure / 0.6;', // pre-exposed, outside of the tone mapping function
			'	gl_FragColor = vec4( ACESFilmicToneMapping( tex.rgb ), tex.a );', '}' ].join( '\n' )
	};

	THREE.ACESFilmicToneMappingShader = ACESFilmicToneMappingShader;

} )();