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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 - materials - HDR 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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- <style>
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- body {
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- color: #fff;
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- font-family:Monospace;
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- font-size:13px;
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- text-align:center;
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- font-weight: bold;
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-
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- background-color: #000;
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- margin: 0px;
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- overflow: hidden;
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- }
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-
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- #info {
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- color:#fff;
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- position: absolute;
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- top: 0px; width: 100%;
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- padding: 5px;
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-
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- }
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-
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- a { color: red; }
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-
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- </style>
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- </head>
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- <body>
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-
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- <div id="container"></div>
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- <div id="info">
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- <a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> - webgl HDR texture example -
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- based on <a href="http://spidergl.org/example.php?id=13" target="_blank" rel="noopener">SpiderGL</a>
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- </div>
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-
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- <script src="../build/three.js"></script>
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-
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- <script src="js/WebGL.js"></script>
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- <script src="js/libs/stats.min.js"></script>
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-
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- <!-- HDR fragment shader -->
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-
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- <script id="fs-hdr" type="x-shader/x-fragment">
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-
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- uniform sampler2D tDiffuse;
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- uniform float exposure;
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- uniform float brightMax;
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-
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- varying vec2 vUv;
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-
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- vec3 decode_pnghdr( const in vec4 color ) {
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-
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- // remove gamma correction
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- vec4 res = color * color;
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-
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- // decoded RI
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- float ri = pow( 2.0, res.w * 32.0 - 16.0 );
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-
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- // decoded HDR pixel
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- res.xyz = res.xyz * ri;
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- return res.xyz;
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-
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- }
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-
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- void main() {
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-
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- vec4 color = texture2D( tDiffuse, vUv );
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- color.xyz = decode_pnghdr( color );
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-
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- // apply gamma correction and exposure
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- //gl_FragColor = vec4( pow( exposure * color.xyz, vec3( 0.474 ) ), 1.0 );
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-
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- // Perform tone-mapping
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- float Y = dot(vec4(0.30, 0.59, 0.11, 0.0), color);
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- float YD = exposure * (exposure/brightMax + 1.0) / (exposure + 1.0);
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- color *= YD;
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-
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- gl_FragColor = vec4( color.xyz, 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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- <!-- HDR vertex shader -->
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-
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- <script id="vs-hdr" type="x-shader/x-vertex">
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-
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- varying vec2 vUv;
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-
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- void main() {
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-
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- vUv = uv;
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- gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 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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-
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- <script>
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-
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- if ( WEBGL.isWebGLAvailable() === false ) {
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-
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- document.body.appendChild( WEBGL.getWebGLErrorMessage() );
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-
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- }
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-
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- var container, stats;
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-
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- var camera, scene, renderer;
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- var materialHDR, quad;
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-
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- var sign = 1, rate = 1;
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-
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- var clock = new THREE.Clock();
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-
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- init();
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- animate();
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-
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- function init() {
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-
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- container = document.getElementById( 'container' );
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-
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- camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 10000 );
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- camera.position.z = 900;
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-
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- scene = new THREE.Scene();
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-
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- var texture = new THREE.TextureLoader().load( "textures/memorial.png" );
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- texture.minFilter = THREE.LinearFilter;
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- texture.magFilter = THREE.NearestFilter;
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-
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- materialHDR = new THREE.ShaderMaterial( {
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-
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- uniforms: {
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- "tDiffuse": { value: texture },
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- "exposure": { value: 0.125 },
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- "brightMax": { value: 0.5 }
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- },
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- vertexShader: getText( 'vs-hdr' ),
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- fragmentShader: getText( 'fs-hdr' )
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-
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- } );
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-
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- var plane = new THREE.PlaneBufferGeometry( 512, 768 );
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-
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- quad = new THREE.Mesh( plane, materialHDR );
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- quad.position.z = - 100;
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- scene.add( quad );
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-
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- renderer = new THREE.WebGLRenderer();
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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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-
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- stats = new Stats();
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- container.appendChild( stats.dom );
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-
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- //
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-
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- window.addEventListener( 'resize', onWindowResize, false );
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-
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- }
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-
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- function onWindowResize() {
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-
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- camera.aspect = window.innerWidth / window.innerHeight;
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- camera.updateProjectionMatrix();
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-
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- renderer.setSize( window.innerWidth, window.innerHeight );
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-
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- }
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-
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- function getText( id ) {
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-
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- return document.getElementById( id ).textContent;
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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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- stats.update();
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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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- var delta = clock.getDelta() * 5;
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-
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- if ( materialHDR.uniforms[ "exposure" ].value > 0 || materialHDR.uniforms[ "exposure" ].value < 1 ) {
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-
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- rate = 0.25;
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-
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- } else {
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-
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- rate = 1;
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-
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- }
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-
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- if ( materialHDR.uniforms[ "exposure" ].value > 5 || materialHDR.uniforms[ "exposure" ].value <= 0 ) {
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-
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- sign *= - 1;
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-
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- }
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-
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- materialHDR.uniforms[ "exposure" ].value += sign * rate * delta;
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-
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- renderer.render( scene, camera );
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-
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- }
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-
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- </script>
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- </body>
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-</html>
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Mr.doob