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203 lines
5.6 KiB
HTML
203 lines
5.6 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>three.js webgl - texture array layer update</title>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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<link type="text/css" rel="stylesheet" href="main.css">
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</head>
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<script id="vs" type="x-shader/x-vertex">
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uniform vec2 size;
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attribute uint instancedIndex;
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flat out uint diffuseIndex;
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out vec2 vUv;
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void main() {
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vec3 translation = vec3(0, float(instancedIndex) * size.y - size.y, 0);
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gl_Position = projectionMatrix * modelViewMatrix * vec4( position + translation, 1.0 );
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diffuseIndex = instancedIndex;
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// Convert position.xy to 1.0-0.0
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vUv.xy = position.xy / size + 0.5;
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vUv.y = 1.0 - vUv.y; // original data is upside down
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}
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</script>
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<script id="fs" type="x-shader/x-fragment">
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precision highp float;
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precision highp int;
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precision highp sampler2DArray;
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uniform sampler2DArray diffuse;
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in vec2 vUv;
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flat in uint diffuseIndex;
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out vec4 outColor;
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void main() {
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outColor = texture( diffuse, vec3( vUv, diffuseIndex ) );
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}
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</script>
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<body>
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<div id="info">
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<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - 2D Compressed Texture Array Layer Updates<br />
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Loop from the movie Spirited away
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by the <a href="https://www.ghibli.jp/" target="_blank" rel="noopener">Studio Ghibli</a><br />
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</div>
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<script type="importmap">
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{
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"imports": {
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"three": "../build/three.module.js",
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"three/addons/": "./jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
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import { KTX2Loader } from 'three/addons/loaders/KTX2Loader.js';
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let camera, scene, mesh, renderer;
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const planeWidth = 20;
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const planeHeight = 10;
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init();
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async function init() {
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const container = document.createElement( 'div' );
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document.body.appendChild( container );
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camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 0.1, 2000 );
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camera.position.z = 70;
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scene = new THREE.Scene();
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// Configure the renderer.
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renderer = new THREE.WebGLRenderer( { antialias: true } );
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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container.appendChild( renderer.domElement );
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// Configure the KTX2 loader.
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const ktx2Loader = new KTX2Loader();
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ktx2Loader.setTranscoderPath( 'jsm/libs/basis/' );
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ktx2Loader.detectSupport( renderer );
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// Load several KTX2 textures which will later be used to modify
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// specific texture array layers.
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const spiritedaway = await ktx2Loader.loadAsync( 'textures/spiritedaway.ktx2' );
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// Create a texture array for rendering.
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const layerByteLength = THREE.TextureUtils.getByteLength(
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spiritedaway.image.width,
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spiritedaway.image.height,
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spiritedaway.format,
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spiritedaway.type,
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);
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const textureArray = new THREE.CompressedArrayTexture( [
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{
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data: new Uint8Array( layerByteLength * 3 ),
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width: spiritedaway.image.width,
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height: spiritedaway.image.height,
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}
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], spiritedaway.image.width, spiritedaway.image.height, 3, spiritedaway.format, spiritedaway.type );
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// Setup the GUI
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const formData = {
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srcLayer: 0,
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destLayer: 0,
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transfer() {
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const layerElementLength = layerByteLength / spiritedaway.mipmaps[ 0 ].data.BYTES_PER_ELEMENT;
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textureArray.mipmaps[ 0 ].data.set(
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spiritedaway.mipmaps[ 0 ].data.subarray(
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layerElementLength * ( formData.srcLayer % spiritedaway.image.depth ),
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layerElementLength * ( ( formData.srcLayer % spiritedaway.image.depth ) + 1 ),
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),
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layerByteLength * formData.destLayer,
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);
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textureArray.addLayerUpdate( formData.destLayer );
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textureArray.needsUpdate = true;
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renderer.render( scene, camera );
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},
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};
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const gui = new GUI();
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gui.add( formData, 'srcLayer', 0, spiritedaway.image.depth - 1, 1 );
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gui.add( formData, 'destLayer', 0, textureArray.image.depth - 1, 1 );
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gui.add( formData, 'transfer' );
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/// Setup the scene.
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const material = new THREE.ShaderMaterial( {
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uniforms: {
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diffuse: { value: textureArray },
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size: { value: new THREE.Vector2( planeWidth, planeHeight ) }
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},
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vertexShader: document.getElementById( 'vs' ).textContent.trim(),
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fragmentShader: document.getElementById( 'fs' ).textContent.trim(),
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glslVersion: THREE.GLSL3
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} );
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const geometry = new THREE.InstancedBufferGeometry();
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geometry.copy( new THREE.PlaneGeometry( planeWidth, planeHeight ) );
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geometry.instanceCount = 3;
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const instancedIndexAttribute = new THREE.InstancedBufferAttribute(
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new Uint16Array( [ 0, 1, 2 ] ), 1, false, 1
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);
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instancedIndexAttribute.gpuType = THREE.IntType;
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geometry.setAttribute( 'instancedIndex', instancedIndexAttribute );
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mesh = new THREE.InstancedMesh( geometry, material, 3 );
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scene.add( mesh );
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window.addEventListener( 'resize', onWindowResize );
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// Initialize the texture array by first rendering the spirited away
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// frames in order.
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textureArray.mipmaps[ 0 ].data.set(
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spiritedaway.mipmaps[ 0 ].data.subarray( 0, textureArray.mipmaps[ 0 ].data.length )
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);
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textureArray.needsUpdate = true;
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renderer.render( scene, camera );
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}
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function onWindowResize() {
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renderer.setSize( window.innerWidth, window.innerHeight );
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camera.aspect = window.innerWidth / window.innerHeight;
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camera.updateProjectionMatrix();
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renderer.render( scene, camera );
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}
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</script>
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</body>
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</html>
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