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- // https://wwwimages2.adobe.com/content/dam/acom/en/products/speedgrade/cc/pdfs/cube-lut-specification-1.0.pdf
- import {
- ClampToEdgeWrapping,
- Data3DTexture,
- FileLoader,
- FloatType,
- LinearFilter,
- Loader,
- UnsignedByteType,
- Vector3,
- } from 'three';
- export class LUTCubeLoader extends Loader {
- constructor( manager ) {
- super( manager );
- this.type = UnsignedByteType;
- }
- setType( type ) {
- if ( type !== UnsignedByteType && type !== FloatType ) {
- throw new Error( 'LUTCubeLoader: Unsupported type' );
- }
- this.type = type;
- return this;
- }
- load( url, onLoad, onProgress, onError ) {
- const loader = new FileLoader( this.manager );
- loader.setPath( this.path );
- loader.setResponseType( 'text' );
- loader.load( url, text => {
- try {
- onLoad( this.parse( text ) );
- } catch ( e ) {
- if ( onError ) {
- onError( e );
- } else {
- console.error( e );
- }
- this.manager.itemError( url );
- }
- }, onProgress, onError );
- }
- parse( input ) {
- const regExpTitle = /TITLE +"([^"]*)"/;
- const regExpSize = /LUT_3D_SIZE +(\d+)/;
- const regExpDomainMin = /DOMAIN_MIN +([\d.]+) +([\d.]+) +([\d.]+)/;
- const regExpDomainMax = /DOMAIN_MAX +([\d.]+) +([\d.]+) +([\d.]+)/;
- const regExpDataPoints = /^([\d.e+-]+) +([\d.e+-]+) +([\d.e+-]+) *$/gm;
- let result = regExpTitle.exec( input );
- const title = ( result !== null ) ? result[ 1 ] : null;
- result = regExpSize.exec( input );
- if ( result === null ) {
- throw new Error( 'LUTCubeLoader: Missing LUT_3D_SIZE information' );
- }
- const size = Number( result[ 1 ] );
- const length = size ** 3 * 4;
- const data = this.type === UnsignedByteType ? new Uint8Array( length ) : new Float32Array( length );
- const domainMin = new Vector3( 0, 0, 0 );
- const domainMax = new Vector3( 1, 1, 1 );
- result = regExpDomainMin.exec( input );
- if ( result !== null ) {
- domainMin.set( Number( result[ 1 ] ), Number( result[ 2 ] ), Number( result[ 3 ] ) );
- }
- result = regExpDomainMax.exec( input );
- if ( result !== null ) {
- domainMax.set( Number( result[ 1 ] ), Number( result[ 2 ] ), Number( result[ 3 ] ) );
- }
- if ( domainMin.x > domainMax.x || domainMin.y > domainMax.y || domainMin.z > domainMax.z ) {
- throw new Error( 'LUTCubeLoader: Invalid input domain' );
- }
- const scale = this.type === UnsignedByteType ? 255 : 1;
- let i = 0;
- while ( ( result = regExpDataPoints.exec( input ) ) !== null ) {
- data[ i ++ ] = Number( result[ 1 ] ) * scale;
- data[ i ++ ] = Number( result[ 2 ] ) * scale;
- data[ i ++ ] = Number( result[ 3 ] ) * scale;
- data[ i ++ ] = scale;
- }
- const texture3D = new Data3DTexture();
- texture3D.image.data = data;
- texture3D.image.width = size;
- texture3D.image.height = size;
- texture3D.image.depth = size;
- texture3D.type = this.type;
- texture3D.magFilter = LinearFilter;
- texture3D.minFilter = LinearFilter;
- texture3D.wrapS = ClampToEdgeWrapping;
- texture3D.wrapT = ClampToEdgeWrapping;
- texture3D.wrapR = ClampToEdgeWrapping;
- texture3D.generateMipmaps = false;
- texture3D.needsUpdate = true;
- return {
- title,
- size,
- domainMin,
- domainMax,
- texture3D,
- };
- }
- }
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