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import TempNode from '../core/TempNode.js';
import { addNodeClass } from '../core/Node.js';
import { addNodeElement, tslFn, nodeObject, float, mat3, vec3 } from '../shadernode/ShaderNode.js';
import { rendererReference } from '../accessors/RendererReferenceNode.js';
import { clamp, log2, max, pow } from '../math/MathNode.js';
import { mul } from '../math/OperatorNode.js';
import { NoToneMapping, LinearToneMapping, ReinhardToneMapping, CineonToneMapping, ACESFilmicToneMapping, AgXToneMapping } from 'three';
// exposure only
const LinearToneMappingNode = tslFn( ( { color, exposure } ) => {
return color.mul( exposure ).clamp();
} );
// source: https://www.cs.utah.edu/docs/techreports/2002/pdf/UUCS-02-001.pdf
const ReinhardToneMappingNode = tslFn( ( { color, exposure } ) => {
color = color.mul( exposure );
return color.div( color.add( 1.0 ) ).clamp();
} );
// source: http://filmicworlds.com/blog/filmic-tonemapping-operators/
const OptimizedCineonToneMappingNode = tslFn( ( { color, exposure } ) => {
// optimized filmic operator by Jim Hejl and Richard Burgess-Dawson
color = color.mul( exposure );
color = color.sub( 0.004 ).max( 0.0 );
const a = color.mul( color.mul( 6.2 ).add( 0.5 ) );
const b = color.mul( color.mul( 6.2 ).add( 1.7 ) ).add( 0.06 );
return a.div( b ).pow( 2.2 );
} );
// source: https://github.com/selfshadow/ltc_code/blob/master/webgl/shaders/ltc/ltc_blit.fs
const RRTAndODTFit = tslFn( ( { color } ) => {
const a = color.mul( color.add( 0.0245786 ) ).sub( 0.000090537 );
const b = color.mul( color.add( 0.4329510 ).mul( 0.983729 ) ).add( 0.238081 );
return a.div( b );
} );
// source: https://github.com/selfshadow/ltc_code/blob/master/webgl/shaders/ltc/ltc_blit.fs
const ACESFilmicToneMappingNode = tslFn( ( { color, exposure } ) => {
// sRGB => XYZ => D65_2_D60 => AP1 => RRT_SAT
const ACESInputMat = mat3(
0.59719, 0.35458, 0.04823,
0.07600, 0.90834, 0.01566,
0.02840, 0.13383, 0.83777
);
// ODT_SAT => XYZ => D60_2_D65 => sRGB
const ACESOutputMat = mat3(
1.60475, - 0.53108, - 0.07367,
- 0.10208, 1.10813, - 0.00605,
- 0.00327, - 0.07276, 1.07602
);
color = color.mul( exposure ).div( 0.6 );
color = ACESInputMat.mul( color );
// Apply RRT and ODT
color = RRTAndODTFit( { color } );
color = ACESOutputMat.mul( color );
// Clamp to [0, 1]
return color.clamp();
} );
const LINEAR_REC2020_TO_LINEAR_SRGB = mat3( vec3( 1.6605, - 0.1246, - 0.0182 ), vec3( - 0.5876, 1.1329, - 0.1006 ), vec3( - 0.0728, - 0.0083, 1.1187 ) );
const LINEAR_SRGB_TO_LINEAR_REC2020 = mat3( vec3( 0.6274, 0.0691, 0.0164 ), vec3( 0.3293, 0.9195, 0.0880 ), vec3( 0.0433, 0.0113, 0.8956 ) );
const agxDefaultContrastApprox = tslFn( ( [ x_immutable ] ) => {
const x = vec3( x_immutable ).toVar();
const x2 = vec3( x.mul( x ) ).toVar();
const x4 = vec3( x2.mul( x2 ) ).toVar();
return float( 15.5 ).mul( x4.mul( x2 ) ).sub( mul( 40.14, x4.mul( x ) ) ).add( mul( 31.96, x4 ).sub( mul( 6.868, x2.mul( x ) ) ).add( mul( 0.4298, x2 ).add( mul( 0.1191, x ).sub( 0.00232 ) ) ) );
} );
const AGXToneMappingNode = tslFn( ( { color, exposure } ) => {
const colortone = vec3( color ).toVar();
const AgXInsetMatrix = mat3( vec3( 0.856627153315983, 0.137318972929847, 0.11189821299995 ), vec3( 0.0951212405381588, 0.761241990602591, 0.0767994186031903 ), vec3( 0.0482516061458583, 0.101439036467562, 0.811302368396859 ) );
const AgXOutsetMatrix = mat3( vec3( 1.1271005818144368, - 0.1413297634984383, - 0.14132976349843826 ), vec3( - 0.11060664309660323, 1.157823702216272, - 0.11060664309660294 ), vec3( - 0.016493938717834573, - 0.016493938717834257, 1.2519364065950405 ) );
const AgxMinEv = float( - 12.47393 );
const AgxMaxEv = float( 4.026069 );
colortone.mulAssign( exposure );
colortone.assign( LINEAR_SRGB_TO_LINEAR_REC2020.mul( colortone ) );
colortone.assign( AgXInsetMatrix.mul( colortone ) );
colortone.assign( max( colortone, 1e-10 ) );
colortone.assign( log2( colortone ) );
colortone.assign( colortone.sub( AgxMinEv ).div( AgxMaxEv.sub( AgxMinEv ) ) );
colortone.assign( clamp( colortone, 0.0, 1.0 ) );
colortone.assign( agxDefaultContrastApprox( colortone ) );
colortone.assign( AgXOutsetMatrix.mul( colortone ) );
colortone.assign( pow( max( vec3( 0.0 ), colortone ), vec3( 2.2 ) ) );
colortone.assign( LINEAR_REC2020_TO_LINEAR_SRGB.mul( colortone ) );
colortone.assign( clamp( colortone, 0.0, 1.0 ) );
return colortone;
} );
const toneMappingLib = {
[ LinearToneMapping ]: LinearToneMappingNode,
[ ReinhardToneMapping ]: ReinhardToneMappingNode,
[ CineonToneMapping ]: OptimizedCineonToneMappingNode,
[ ACESFilmicToneMapping ]: ACESFilmicToneMappingNode,
[ AgXToneMapping ]: AGXToneMappingNode
};
class ToneMappingNode extends TempNode {
constructor( toneMapping = NoToneMapping, exposureNode = toneMappingExposure, colorNode = null ) {
super( 'vec3' );
this.toneMapping = toneMapping;
this.exposureNode = exposureNode;
this.colorNode = colorNode;
}
getCacheKey() {
let cacheKey = super.getCacheKey();
cacheKey = '{toneMapping:' + this.toneMapping + ',nodes:' + cacheKey + '}';
return cacheKey;
}
setup( builder ) {
const colorNode = this.colorNode || builder.context.color;
const toneMapping = this.toneMapping;
if ( toneMapping === NoToneMapping ) return colorNode;
const toneMappingParams = { exposure: this.exposureNode, color: colorNode };
const toneMappingNode = toneMappingLib[ toneMapping ];
let outputNode = null;
if ( toneMappingNode ) {
outputNode = toneMappingNode( toneMappingParams );
} else {
console.error( 'ToneMappingNode: Unsupported Tone Mapping configuration.', toneMapping );
outputNode = colorNode;
}
return outputNode;
}
}
export default ToneMappingNode;
export const toneMapping = ( mapping, exposure, color ) => nodeObject( new ToneMappingNode( mapping, nodeObject( exposure ), nodeObject( color ) ) );
export const toneMappingExposure = rendererReference( 'toneMappingExposure', 'float' );
addNodeElement( 'toneMapping', ( color, mapping, exposure ) => toneMapping( mapping, exposure, color ) );
addNodeClass( 'ToneMappingNode', ToneMappingNode );