three
Version:
JavaScript 3D library
142 lines (87 loc) • 3.63 kB
JavaScript
import TempNode from '../core/TempNode.js';
import { addNodeClass } from '../core/Node.js';
import { tslFn, nodeObject, float, mat3 } from '../shadernode/ShaderNode.js';
import { NoToneMapping, LinearToneMapping, ReinhardToneMapping, CineonToneMapping, ACESFilmicToneMapping } 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 toneMappingLib = {
[ LinearToneMapping ]: LinearToneMappingNode,
[ ReinhardToneMapping ]: ReinhardToneMappingNode,
[ CineonToneMapping ]: OptimizedCineonToneMappingNode,
[ ACESFilmicToneMapping ]: ACESFilmicToneMappingNode
};
class ToneMappingNode extends TempNode {
constructor( toneMapping = NoToneMapping, exposureNode = float( 1 ), 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 ) ) );
addNodeClass( 'ToneMappingNode', ToneMappingNode );