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<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - panorama</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
		<link type="text/css" rel="stylesheet" href="main.css">
	</head>
	<body>
		<div id="container"></div>
		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - cube panorama demo
		</div>

		<!-- Import maps polyfill -->
		<!-- Remove this when import maps will be widely supported -->
		<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>

		<script type="importmap">
			{
				"imports": {
					"three": "../build/three.module.js",
					"three/addons/": "./jsm/"
				}
			}
		</script>

		<script type="module">
			import * as THREE from 'three';
			import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
			let camera, controls;
			let renderer;
			let scene;
			init();
			animate();
			function init() {
				const container = document.getElementById( 'container' );
				renderer = new THREE.WebGLRenderer();
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				container.appendChild( renderer.domElement );
				scene = new THREE.Scene();
				camera = new THREE.PerspectiveCamera( 90, window.innerWidth / window.innerHeight, 0.1, 100 );
				camera.position.z = 0.01;
				controls = new OrbitControls( camera, renderer.domElement );
				controls.enableZoom = false;
				controls.enablePan = false;
				controls.enableDamping = true;
				controls.rotateSpeed = - 0.25;
				const textures = getTexturesFromAtlasFile( 'textures/cube/sun_temple_stripe.jpg', 6 );
				const materials = [];
				for ( let i = 0; i < 6; i ++ ) {
					materials.push( new THREE.MeshBasicMaterial( { map: textures[ i ] } ) );
				}
				const skyBox = new THREE.Mesh( new THREE.BoxGeometry( 1, 1, 1 ), materials );
				skyBox.geometry.scale( 1, 1, - 1 );
				scene.add( skyBox );
				window.addEventListener( 'resize', onWindowResize );
			}
			function getTexturesFromAtlasFile( atlasImgUrl, tilesNum ) {
				const textures = [];
				for ( let i = 0; i < tilesNum; i ++ ) {
					textures[ i ] = new THREE.Texture();
				}
				new THREE.ImageLoader()
					.load( atlasImgUrl, ( image ) => {

						let canvas, context;
						const tileWidth = image.height;

						for ( let i = 0; i < textures.length; i ++ ) {

							canvas = document.createElement( 'canvas' );
							context = canvas.getContext( '2d' );
							canvas.height = tileWidth;
							canvas.width = tileWidth;
							context.drawImage( image, tileWidth * i, 0, tileWidth, tileWidth, 0, 0, tileWidth, tileWidth );
							textures[ i ].image = canvas;
							textures[ i ].needsUpdate = true;
						}
					} );
				return textures;
			}
			function onWindowResize() {
				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();
				renderer.setSize( window.innerWidth, window.innerHeight );
			}
			function animate() {
				requestAnimationFrame( animate );
				controls.update(); // required when damping is enabled
				renderer.render( scene, camera );

			}

		</script>
	</body>
</html>