Source: loader/CubeTextureLoader.js

import Class from '../core/Class';
import BasicLoader from './BasicLoader';
import CubeTexture from '../texture/CubeTexture';
import Loader from './Loader';
import log from '../utils/log';

/**
 * CubeTexture加载类
 * @class
 * @extends {BasicLoader}
 * @example
 * var loader = new Hilo3d.CubeTextureLoader();
 * loader.load({
 *     crossOrigin: true,
 *     images: [
 *         '//gw.alicdn.com/tfs/TB1Ss.ORpXXXXcNXVXXXXXXXXXX-2048-2048.jpg_960x960.jpg',
 *         '//gw.alicdn.com/tfs/TB1YhUDRpXXXXcyaXXXXXXXXXXX-2048-2048.jpg_960x960.jpg',
 *         '//gw.alicdn.com/tfs/TB1Y1MORpXXXXcpXVXXXXXXXXXX-2048-2048.jpg_960x960.jpg',
 *         '//gw.alicdn.com/tfs/TB1ZgAqRpXXXXa0aFXXXXXXXXXX-2048-2048.jpg_960x960.jpg',
 *         '//gw.alicdn.com/tfs/TB1IVZNRpXXXXaNXFXXXXXXXXXX-2048-2048.jpg_960x960.jpg',
 *         '//gw.alicdn.com/tfs/TB1M3gyRpXXXXb9apXXXXXXXXXX-2048-2048.jpg_960x960.jpg'
 *     ]
 * }).then(function (skybox) {
 *     var material = new Hilo3d.BasicMaterial({
 *         diffuse: skybox
 *     });
 *     ...
 * });
 */
const CubeTextureLoader = Class.create(/** @lends CubeTextureLoader.prototype */{
    Extends: BasicLoader,
    /**
     * @default true
     * @type {boolean}
     */
    isCubeTextureLoader: true,
    /**
     * @default CubeTextureLoader
     * @type {string}
     */
    className: 'CubeTextureLoader',
    /**
     * @constructs
     */
    constructor() {
        CubeTextureLoader.superclass.constructor.call(this);
    },
    /**
     * 加载CubeTexture
     * @param {object} params 加载参数
     * @param {boolean} params.crossOrigin 是否跨域，不传将自动判断
     * @param {Array.<string>} params.images 纹理图片地址数组，顺序为 right, left, top, bottom, front, back
     * @param {string} params.right 右面的图片地址
     * @param {string} params.left 左面的图片地址
     * @param {string} params.top 上面的图片地址
     * @param {string} params.bottom 下面的图片地址
     * @param {string} params.front 前面的图片地址
     * @param {string} params.back 背面的图片地址
     * @async
     * @return {Promise<CubeTexture, Error>} 返回加载完的CubeTexture对象
     */
    load(params) {
        let images;
        if (params.images && Array.isArray(params.images)) {
            images = params.images;
        } else {
            images = [params.right, params.left, params.top, params.bottom, params.front, params.back];
        }
        return Promise.all(images.map((img) => {
            return this.loadImg(img, params.crossOrigin);
        })).then((images) => {
            const args = Object.assign({}, params);
            delete args.images;
            delete args.type;
            delete args.right;
            delete args.left;
            delete args.top;
            delete args.bottom;
            delete args.front;
            delete args.back;
            args.image = images;
            return new CubeTexture(args);
        }).catch((err) => {
            log.error('load CubeTexture failed', err.message, err.stack);
            throw err;
        });
    }
});

Loader.addLoader('CubeTexture', CubeTextureLoader);

export default CubeTextureLoader;