mirror of
https://github.com/Doodle3D/Doodle3D-Slicer.git
synced 2024-12-25 04:23:47 +01:00
236 lines
5.2 KiB
HTML
236 lines
5.2 KiB
HTML
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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 loader</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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background-color: #000;
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margin: 0px;
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overflow: hidden;
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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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a { color: red; }
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</style>
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</head>
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<body>
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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">three.js</a> - webgl HDR texture loader example -
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based on <a href="http://spidergl.org/example.php?id=13" target="_blank">SpiderGL</a>
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</div>
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<script src="../build/three.min.js"></script>
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<script src="js/loaders/RGBELoader.js"></script>
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<script src="js/Detector.js"></script>
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<script src="js/libs/stats.min.js"></script>
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<!-- HDR fragment shader -->
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<script id="fs-hdr" type="x-shader/x-fragment">
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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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varying vec2 vUv;
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vec3 decode_pnghdr( const in vec4 color ) {
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vec4 rgbcolor = vec4( 0.0, 0.0, 0.0, 0.0 );
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if ( color.w > 0.0 ) {
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float f = pow(2.0, 127.0*(color.w-0.5));
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rgbcolor.xyz = color.xyz * f;
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}
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return rgbcolor.xyz;
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/*
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// remove gamma correction
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vec4 res = color * color;
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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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// 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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void main() {
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vec4 color = texture2D( tDiffuse, vUv );
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color.xyz = decode_pnghdr( color );
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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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// 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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gl_FragColor = vec4( color.xyz, 1.0 );
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}
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</script>
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<!-- HDR vertex shader -->
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<script id="vs-hdr" type="x-shader/x-vertex">
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varying vec2 vUv;
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void main() {
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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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</script>
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<script>
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if ( ! Detector.webgl ) Detector.addGetWebGLMessage();
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var container, stats;
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var camera, scene, renderer;
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var materialHDR, quad, gamma, exposure;
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var sign = 1, rate = 1;
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var clock = new THREE.Clock();
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init();
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function init() {
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container = document.getElementById( 'container' );
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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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scene = new THREE.Scene();
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var loader = new THREE.RGBELoader();
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var texture = loader.load( "textures/miranda_uncropped.hdr", function( texture, textureData ){
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console.log( textureData.header ); // header string
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console.log( [textureData.width, textureData.height] ); // dimensions
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materialHDR = new THREE.ShaderMaterial( {
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uniforms: {
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tDiffuse: { type: "t", value: texture },
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exposure: { type: "f", value: textureData.exposure },
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brightMax: { type: "f", value: textureData.gamma }
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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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quad = new THREE.Mesh( new THREE.PlaneBufferGeometry( textureData.width, textureData.height ), materialHDR );
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quad.position.z = -100;
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scene.add( quad );
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animate();
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} );
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texture.minFilter = THREE.LinearFilter;
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texture.magFilter = THREE.NearestFilter;
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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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stats = new Stats();
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stats.domElement.style.position = 'absolute';
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stats.domElement.style.top = '0px';
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container.appendChild( stats.domElement );
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//
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window.addEventListener( 'resize', onWindowResize, false );
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}
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function onWindowResize() {
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camera.aspect = window.innerWidth / window.innerHeight;
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camera.updateProjectionMatrix();
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renderer.setSize( window.innerWidth, window.innerHeight );
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}
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function getText( id ) {
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return document.getElementById( id ).textContent;
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}
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//
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function animate() {
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requestAnimationFrame( animate );
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render();
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stats.update();
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}
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function render() {
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delta = clock.getDelta() * 5;
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if ( materialHDR.uniforms.exposure.value > 0 || materialHDR.uniforms.exposure.value < 1 ) {
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rate = 0.25;
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} else {
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rate = 1;
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}
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if ( materialHDR.uniforms.exposure.value > 5 || materialHDR.uniforms.exposure.value <= 0 ) {
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sign *= -1;
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}
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materialHDR.uniforms.exposure.value += sign * rate * delta;
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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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