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