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+<!doctype html>
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+<html lang="en">
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+ <head>
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+ <title>three.js - webgl</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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+ <style>
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+ body {
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+ background:#fff;
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+ padding:0;
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+ margin:0;
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+ overflow:hidden;
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+ }
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+
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+ </style>
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+ </head>
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+
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+ <body>
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+ <script type="x-shader/x-fragment" id="fragmentShader">
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+
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+ void main() {
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+
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+ if ( mod ( gl_FragCoord.x, 4.0001 ) < 1.0 || mod ( gl_FragCoord.y, 4.0001 ) < 1.0 )
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+
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+ gl_FragColor = vec4( XXX, 1.0 );
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+
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+ else
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+
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+ gl_FragColor = vec4( 1.0 );
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+
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+ }
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+
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+ </script>
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+
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+ <script type="x-shader/x-vertex" id="vertexShader">
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+
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+ void main() {
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+
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+ vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );
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+ gl_Position = projectionMatrix * mvPosition;
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+
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+ }
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+
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+ </script>
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+
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+ <script src="../build/Three.js"></script>
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+
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+ <script>
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+
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+ var N = 100;
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+
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+ var container;
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+
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+ var camera, scene, renderer;
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+
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+ var geometry, meshes = [];
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+
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+ var fragmentShader, vertexShader;
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+
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+ init();
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+ setInterval( render, 1000 / 60 );
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+
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+ function init() {
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+
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+ container = document.createElement( 'div' );
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+ document.body.appendChild( container );
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+
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+ vertexShader = document.getElementById( "vertexShader" ).textContent;
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+ fragmentShader = document.getElementById( "fragmentShader" ).textContent;
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+
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+ scene = new THREE.Scene();
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+
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+ camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 10000 );
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+ camera.position.z = 2000;
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+ scene.add( camera );
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+
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+ geometry = new THREE.SphereGeometry( 15, 64, 32 );
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+
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+ for ( var i = 0; i < N; i ++ ) {
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+
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+ var material = new THREE.ShaderMaterial( { vertexShader: vertexShader, fragmentShader: generateFragmentShader() } );
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+
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+ mesh = new THREE.Mesh( geometry, material );
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+
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+ mesh.position.x = ( 0.5 - Math.random() ) * 1000;
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+ mesh.position.y = ( 0.5 - Math.random() ) * 1000;
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+ mesh.position.z = ( 0.5 - Math.random() ) * 1000;
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+
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+ scene.add( mesh );
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+
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+ meshes.push( mesh );
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+
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+ }
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+
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+ renderer = new THREE.WebGLRenderer();
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+ container.appendChild( renderer.domElement );
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+
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+ }
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+
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+ //
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+
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+ function generateFragmentShader() {
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+
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+ return fragmentShader.replace( "XXX", Math.random() + "," + Math.random() + "," + Math.random() );
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+
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+ }
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+
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+ //
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+
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+ function animate() {
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+
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+ requestAnimationFrame( animate );
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+
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+ render();
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+
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+ }
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+
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+ function render() {
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+
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+ for ( var i = 0; i < N; i ++ ) {
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+
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+ var mesh = meshes[ i ];
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+ mesh.material = new THREE.ShaderMaterial( { vertexShader: vertexShader, fragmentShader: generateFragmentShader() } );
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+
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+ }
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+
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+ renderer.render( scene, camera );
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+
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+ console.log( "before", renderer.info.memory.programs );
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+
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+ for ( var i = 0; i < N; i ++ ) {
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+
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+ var mesh = meshes[ i ];
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+ renderer.deallocateMaterial( mesh.material );
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+
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+ }
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+
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+ console.log( "after", renderer.info.memory.programs );
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+
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+ }
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+
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+ </script>
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+
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+ </body>
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+</html>
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alteredq