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224 lines
5.4 KiB
224 lines
5.4 KiB
<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>three.js webgl - framebuffer - texture</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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<style>
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#selection {
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position: fixed;
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display: flex;
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flex-direction: column;
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justify-content: center;
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align-items: center;
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height: 100%;
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width: 100%;
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top: 0;
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z-index: 999;
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}
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#selection > div {
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height: 128px;
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width: 128px;
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border: 1px solid white;
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}
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</style>
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</head>
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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 noreferrer">three.js</a> framebuffer to texture
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</div>
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<div id="selection">
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<div></div>
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</div>
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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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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 { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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import * as GeometryUtils from 'three/addons/utils/GeometryUtils.js';
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let camera, scene, renderer;
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let line, sprite, texture;
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let cameraOrtho, sceneOrtho;
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let offset = 0;
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const dpr = window.devicePixelRatio;
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const textureSize = 128 * dpr;
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const vector = new THREE.Vector2();
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const color = new THREE.Color();
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init();
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animate();
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function init() {
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//
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const width = window.innerWidth;
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const height = window.innerHeight;
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camera = new THREE.PerspectiveCamera( 70, width / height, 1, 1000 );
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camera.position.z = 20;
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cameraOrtho = new THREE.OrthographicCamera( - width / 2, width / 2, height / 2, - height / 2, 1, 10 );
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cameraOrtho.position.z = 10;
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scene = new THREE.Scene();
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sceneOrtho = new THREE.Scene();
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//
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const points = GeometryUtils.gosper( 8 );
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const geometry = new THREE.BufferGeometry();
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const positionAttribute = new THREE.Float32BufferAttribute( points, 3 );
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geometry.setAttribute( 'position', positionAttribute );
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geometry.center();
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const colorAttribute = new THREE.BufferAttribute( new Float32Array( positionAttribute.array.length ), 3 );
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colorAttribute.setUsage( THREE.DynamicDrawUsage );
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geometry.setAttribute( 'color', colorAttribute );
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const material = new THREE.LineBasicMaterial( { vertexColors: true } );
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line = new THREE.Line( geometry, material );
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line.scale.setScalar( 0.05 );
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scene.add( line );
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//
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texture = new THREE.FramebufferTexture( textureSize, textureSize, THREE.RGBAFormat );
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texture.minFilter = THREE.NearestFilter;
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texture.magFilter = THREE.NearestFilter;
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//
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const spriteMaterial = new THREE.SpriteMaterial( { map: texture } );
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sprite = new THREE.Sprite( spriteMaterial );
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sprite.scale.set( textureSize, textureSize, 1 );
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sceneOrtho.add( sprite );
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updateSpritePosition();
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//
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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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renderer.autoClear = false;
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document.body.appendChild( renderer.domElement );
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//
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const selection = document.getElementById( 'selection' );
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const controls = new OrbitControls( camera, selection );
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controls.enablePan = false;
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//
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window.addEventListener( 'resize', onWindowResize );
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}
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function onWindowResize() {
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const width = window.innerWidth;
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const height = window.innerHeight;
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camera.aspect = width / height;
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camera.updateProjectionMatrix();
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cameraOrtho.left = - width / 2;
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cameraOrtho.right = width / 2;
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cameraOrtho.top = height / 2;
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cameraOrtho.bottom = - height / 2;
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cameraOrtho.updateProjectionMatrix();
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renderer.setSize( window.innerWidth, window.innerHeight );
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updateSpritePosition();
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}
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function updateSpritePosition() {
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const halfWidth = window.innerWidth / 2;
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const halfHeight = window.innerHeight / 2;
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const halfImageWidth = textureSize / 2;
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const halfImageHeight = textureSize / 2;
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sprite.position.set( - halfWidth + halfImageWidth, halfHeight - halfImageHeight, 1 );
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}
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function animate() {
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requestAnimationFrame( animate );
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const colorAttribute = line.geometry.getAttribute( 'color' );
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updateColors( colorAttribute );
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// scene rendering
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renderer.clear();
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renderer.render( scene, camera );
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// calculate start position for copying data
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vector.x = ( window.innerWidth * dpr / 2 ) - ( textureSize / 2 );
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vector.y = ( window.innerHeight * dpr / 2 ) - ( textureSize / 2 );
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renderer.copyFramebufferToTexture( vector, texture );
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renderer.clearDepth();
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renderer.render( sceneOrtho, cameraOrtho );
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}
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function updateColors( colorAttribute ) {
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const l = colorAttribute.count;
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for ( let i = 0; i < l; i ++ ) {
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const h = ( ( offset + i ) % l ) / l;
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color.setHSL( h, 1, 0.5 );
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colorAttribute.setX( i, color.r );
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colorAttribute.setY( i, color.g );
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colorAttribute.setZ( i, color.b );
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}
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colorAttribute.needsUpdate = true;
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offset -= 25;
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}
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</script>
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</body>
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</html>
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