150 lines
2.8 KiB
JavaScript
150 lines
2.8 KiB
JavaScript
import {
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Loader,
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TextureLoader,
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Data3DTexture,
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RGBAFormat,
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UnsignedByteType,
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ClampToEdgeWrapping,
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LinearFilter,
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} from 'three';
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export class LUTImageLoader extends Loader {
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constructor( flipVertical = false ) {
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//The NeutralLUT.png has green at the bottom for Unreal ang green at the top for Unity URP Color Lookup
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//post-processing. If you're using lut image strips from a Unity pipeline then pass true to the constructor
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super();
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this.flip = flipVertical;
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}
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load( url, onLoad, onProgress, onError ) {
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const loader = new TextureLoader( this.manager );
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loader.setCrossOrigin( this.crossOrigin );
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loader.setPath( this.path );
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loader.load( url, texture => {
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try {
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let imageData;
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if ( texture.image.width < texture.image.height ) {
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imageData = this.getImageData( texture );
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} else {
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imageData = this.horz2Vert( texture );
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}
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onLoad( this.parse( imageData.data, Math.min( texture.image.width, texture.image.height ) ) );
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} catch ( e ) {
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if ( onError ) {
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onError( e );
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} else {
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console.error( e );
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}
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this.manager.itemError( url );
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}
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}, onProgress, onError );
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}
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getImageData( texture ) {
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const width = texture.image.width;
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const height = texture.image.height;
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const canvas = document.createElement( 'canvas' );
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canvas.width = width;
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canvas.height = height;
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const context = canvas.getContext( '2d' );
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if ( this.flip === true ) {
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context.scale( 1, - 1 );
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context.translate( 0, - height );
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}
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context.drawImage( texture.image, 0, 0 );
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return context.getImageData( 0, 0, width, height );
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}
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horz2Vert( texture ) {
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const width = texture.image.height;
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const height = texture.image.width;
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const canvas = document.createElement( 'canvas' );
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canvas.width = width;
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canvas.height = height;
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const context = canvas.getContext( '2d' );
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if ( this.flip === true ) {
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context.scale( 1, - 1 );
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context.translate( 0, - height );
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}
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for ( let i = 0; i < width; i ++ ) {
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const sy = i * width;
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const dy = ( this.flip ) ? height - i * width : i * width;
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context.drawImage( texture.image, sy, 0, width, width, 0, dy, width, width );
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}
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return context.getImageData( 0, 0, width, height );
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}
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parse( dataArray, size ) {
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const data = new Uint8Array( dataArray );
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const texture3D = new Data3DTexture();
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texture3D.image.data = data;
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texture3D.image.width = size;
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texture3D.image.height = size;
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texture3D.image.depth = size;
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texture3D.format = RGBAFormat;
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texture3D.type = UnsignedByteType;
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texture3D.magFilter = LinearFilter;
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texture3D.minFilter = LinearFilter;
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texture3D.wrapS = ClampToEdgeWrapping;
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texture3D.wrapT = ClampToEdgeWrapping;
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texture3D.wrapR = ClampToEdgeWrapping;
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texture3D.generateMipmaps = false;
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texture3D.needsUpdate = true;
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return {
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size,
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texture3D,
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};
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}
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}
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