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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>
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