backend/libs/three/loaders/CubeTextureLoader.js

import { ImageLoader } from './ImageLoader.js';
import { CubeTexture } from '../textures/CubeTexture.js';
import { Loader } from './Loader.js';

class CubeTextureLoader extends Loader {
	constructor(manager) {
		super(manager);
	}

	load(urls, onLoad, onProgress, onError) {
		const texture = new CubeTexture();

		const loader = new ImageLoader(this.manager);
		loader.setCrossOrigin(this.crossOrigin);
		loader.setPath(this.path);

		let loaded = 0;

		function loadTexture(i) {
			loader.load(
				urls[i],
				function (image) {
					texture.images[i] = image;

					loaded++;

					if (loaded === 6) {
						texture.needsUpdate = true;

						if (onLoad) onLoad(texture);
					}
				},
				undefined,
				onError
			);
		}

		for (let i = 0; i < urls.length; ++i) {
			loadTexture(i);
		}

		return texture;
	}
}

export { CubeTextureLoader };