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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - texture array layer update</title>
		<meta charset="UTF-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<link type="text/css" rel="stylesheet" href="main.css">
	</head>
	<script id="vs" type="x-shader/x-vertex">
	uniform vec2 size;
	attribute uint instancedIndex;
	flat out uint diffuseIndex; 
	out vec2 vUv;

	void main() {

		vec3 translation = vec3(0, float(instancedIndex) * size.y - size.y, 0);
		gl_Position = projectionMatrix * modelViewMatrix * vec4( position + translation, 1.0 );

		diffuseIndex = instancedIndex;

		// Convert position.xy to 1.0-0.0

		vUv.xy = position.xy / size + 0.5;
		vUv.y = 1.0 - vUv.y; // original data is upside down

	}
	</script>

	<script id="fs" type="x-shader/x-fragment">
	precision highp float;
	precision highp int;
	precision highp sampler2DArray;

	uniform sampler2DArray diffuse;
	in vec2 vUv;
	flat in uint diffuseIndex;

	out vec4 outColor;

	void main() {

		outColor = texture( diffuse, vec3( vUv, diffuseIndex ) );

	}
	</script>
	<body>
		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - 2D Compressed Texture Array Layer Updates<br />
			Loop from the movie Spirited away
			by the <a href="https://www.ghibli.jp/" target="_blank" rel="noopener">Studio Ghibli</a><br />
		</div>

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

		<script type="module">

			import * as THREE from 'three';

			import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
			import { KTX2Loader } from 'three/addons/loaders/KTX2Loader.js';

			let camera, scene, mesh, renderer;

			const planeWidth = 20;
			const planeHeight = 10;

			init();

			async function init() {

				const container = document.createElement( 'div' );
				document.body.appendChild( container );

				camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 0.1, 2000 );
				camera.position.z = 70;

				scene = new THREE.Scene();

				// Configure the renderer.

				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				container.appendChild( renderer.domElement );

				// Configure the KTX2 loader.

				const ktx2Loader = new KTX2Loader();
				ktx2Loader.setTranscoderPath( 'jsm/libs/basis/' );
				ktx2Loader.detectSupport( renderer );

				// Load several KTX2 textures which will later be used to modify
				// specific texture array layers.

				const spiritedaway = await ktx2Loader.loadAsync( 'textures/spiritedaway.ktx2' );

				// Create a texture array for rendering.

				const layerByteLength = THREE.TextureUtils.getByteLength(
					spiritedaway.image.width,
					spiritedaway.image.height,
					spiritedaway.format,
					spiritedaway.type,
				);

				const textureArray = new THREE.CompressedArrayTexture( [
					{
						data: new Uint8Array( layerByteLength * 3 ),
						width: spiritedaway.image.width,
						height: spiritedaway.image.height,
					}
				], spiritedaway.image.width, spiritedaway.image.height, 3, spiritedaway.format, spiritedaway.type );

				// Setup the GUI

				const formData = {
					srcLayer: 0,
					destLayer: 0,
					transfer() {
						const layerElementLength = layerByteLength / spiritedaway.mipmaps[ 0 ].data.BYTES_PER_ELEMENT;
						textureArray.mipmaps[ 0 ].data.set(
							spiritedaway.mipmaps[ 0 ].data.subarray(
								layerElementLength * ( formData.srcLayer % spiritedaway.image.depth ),
								layerElementLength * ( ( formData.srcLayer % spiritedaway.image.depth ) + 1 ),
							),
							layerByteLength * formData.destLayer,
						);
						textureArray.addLayerUpdate( formData.destLayer );
						textureArray.needsUpdate = true;

						renderer.render( scene, camera );
					},
				};

				const gui = new GUI();
				gui.add( formData, 'srcLayer', 0, spiritedaway.image.depth - 1, 1 );
				gui.add( formData, 'destLayer', 0, textureArray.image.depth - 1, 1 );
				gui.add( formData, 'transfer' );

				/// Setup the scene.

				const material = new THREE.ShaderMaterial( {
					uniforms: {
						diffuse: { value: textureArray },
						size: { value: new THREE.Vector2( planeWidth, planeHeight ) }
					},
					vertexShader: document.getElementById( 'vs' ).textContent.trim(),
					fragmentShader: document.getElementById( 'fs' ).textContent.trim(),
					glslVersion: THREE.GLSL3
				} );

				const geometry = new THREE.InstancedBufferGeometry();
				geometry.copy( new THREE.PlaneGeometry( planeWidth, planeHeight ) );
				geometry.instanceCount = 3;

				const instancedIndexAttribute = new THREE.InstancedBufferAttribute(
					new Uint16Array( [ 0, 1, 2 ] ), 1, false, 1
				);
				instancedIndexAttribute.gpuType = THREE.IntType;
				geometry.setAttribute( 'instancedIndex', instancedIndexAttribute );

				mesh = new THREE.InstancedMesh( geometry, material, 3 );

				scene.add( mesh );

				window.addEventListener( 'resize', onWindowResize );

				// Initialize the texture array by first rendering the spirited away
				// frames in order.

				textureArray.mipmaps[ 0 ].data.set(
					spiritedaway.mipmaps[ 0 ].data.subarray( 0, textureArray.mipmaps[ 0 ].data.length )
				);
				textureArray.needsUpdate = true;
				renderer.render( scene, camera );

			}

			function onWindowResize() {

				renderer.setSize( window.innerWidth, window.innerHeight );

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.render( scene, camera );

			}

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