three 基础库
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( function () {
// https://wwwimages2.adobe.com/content/dam/acom/en/products/speedgrade/cc/pdfs/cube-lut-specification-1.0.pdf
class LUTCubeLoader extends THREE.Loader {
load( url, onLoad, onProgress, onError ) {
const loader = new THREE.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( str ) {
// Remove empty lines and comments
str = str.replace( /^#.*?(\n|\r)/gm, '' ).replace( /^\s*?(\n|\r)/gm, '' ).trim();
let title = null;
let size = null;
const domainMin = new THREE.Vector3( 0, 0, 0 );
const domainMax = new THREE.Vector3( 1, 1, 1 );
const lines = str.split( /[\n\r]+/g );
let data = null;
let currIndex = 0;
for ( let i = 0, l = lines.length; i < l; i ++ ) {
const line = lines[ i ].trim();
const split = line.split( /\s/g );
switch ( split[ 0 ] ) {
case 'TITLE':
title = line.substring( 7, line.length - 1 );
break;
case 'LUT_3D_SIZE':
// TODO: A .CUBE LUT file specifies floating point values and could be represented with
// more precision than can be captured with Uint8Array.
const sizeToken = split[ 1 ];
size = parseFloat( sizeToken );
data = new Uint8Array( size * size * size * 3 );
break;
case 'DOMAIN_MIN':
domainMin.x = parseFloat( split[ 1 ] );
domainMin.y = parseFloat( split[ 2 ] );
domainMin.z = parseFloat( split[ 3 ] );
break;
case 'DOMAIN_MAX':
domainMax.x = parseFloat( split[ 1 ] );
domainMax.y = parseFloat( split[ 2 ] );
domainMax.z = parseFloat( split[ 3 ] );
break;
default:
const r = parseFloat( split[ 0 ] );
const g = parseFloat( split[ 1 ] );
const b = parseFloat( split[ 2 ] );
if ( r > 1.0 || r < 0.0 || g > 1.0 || g < 0.0 || b > 1.0 || b < 0.0 ) {
throw new Error( 'LUTCubeLoader : Non normalized values not supported.' );
}
data[ currIndex + 0 ] = r * 255;
data[ currIndex + 1 ] = g * 255;
data[ currIndex + 2 ] = b * 255;
currIndex += 3;
}
}
const texture = new THREE.DataTexture();
texture.image.data = data;
texture.image.width = size;
texture.image.height = size * size;
texture.format = THREE.RGBFormat;
texture.type = THREE.UnsignedByteType;
texture.magFilter = THREE.LinearFilter;
texture.minFilter = THREE.LinearFilter;
texture.wrapS = THREE.ClampToEdgeWrapping;
texture.wrapT = THREE.ClampToEdgeWrapping;
texture.generateMipmaps = false;
const texture3D = new THREE.DataTexture3D();
texture3D.image.data = data;
texture3D.image.width = size;
texture3D.image.height = size;
texture3D.image.depth = size;
texture3D.format = THREE.RGBFormat;
texture3D.type = THREE.UnsignedByteType;
texture3D.magFilter = THREE.LinearFilter;
texture3D.minFilter = THREE.LinearFilter;
texture3D.wrapS = THREE.ClampToEdgeWrapping;
texture3D.wrapT = THREE.ClampToEdgeWrapping;
texture3D.wrapR = THREE.ClampToEdgeWrapping;
texture3D.generateMipmaps = false;
return {
title,
size,
domainMin,
domainMax,
texture,
texture3D
};
}
}
THREE.LUTCubeLoader = LUTCubeLoader;
} )();