three
Version:
JavaScript 3D library
128 lines (79 loc) • 3.44 kB
JavaScript
import TempNode from '../core/Node.js';
import { ShaderNode, vec3, mat3, float, clamp, max, pow } from '../shadernode/ShaderNodeBaseElements.js';
import { NoToneMapping, LinearToneMapping, ReinhardToneMapping, CineonToneMapping, ACESFilmicToneMapping } from 'three';
// exposure only
export const LinearToneMappingNode = new ShaderNode( ( { color, exposure } ) => {
return color.mul( exposure );
} );
// source: https://www.cs.utah.edu/docs/techreports/2002/pdf/UUCS-02-001.pdf
export const ReinhardToneMappingNode = new ShaderNode( ( { color, exposure } ) => {
color = color.mul( exposure );
return clamp( color.div( vec3( 1.0 ).add( color ) ) );
} );
// source: http://filmicworlds.com/blog/filmic-tonemapping-operators/
export const OptimizedCineonToneMappingNode = new ShaderNode( ( { color, exposure } ) => {
// optimized filmic operator by Jim Hejl and Richard Burgess-Dawson
color = color.mul( exposure );
color = max( vec3( 0.0 ), color.sub( 0.004 ) );
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 pow( a.div( b ), vec3( 2.2 ) );
} );
// source: https://github.com/selfshadow/ltc_code/blob/master/webgl/shaders/ltc/ltc_blit.fs
const RRTAndODTFit = new ShaderNode( ( { 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 = new ShaderNode( ( { color, exposure } ) => {
// sRGB => XYZ => D65_2_D60 => AP1 => RRT_SAT
const 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 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 = color.mul( exposure ).div( 0.6 );
color = ACESInputMat.mul( color );
// Apply RRT and ODT
color = RRTAndODTFit.call( { color } );
color = ACESOutputMat.mul( color );
// Clamp to [0, 1]
return clamp( color );
} );
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;
}
construct( 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.call( toneMappingParams );
} else {
console.error( 'ToneMappingNode: Unsupported Tone Mapping configuration.', toneMapping );
outputNode = colorNode;
}
return outputNode;
}
}
export default ToneMappingNode;