javascript
/
three.js
镜像自地址 https://github.com/tazdij/three.js.git


			
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - Depth Texture</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<style>
			body {
				color: #fff;
				font-family:Monospace;
				font-size:13px;
				text-align:center;
				background-color: #000;
				margin: 0px;
				overflow: hidden;
			}
			a {
				color: #B2E9FF;
				font-weight: bold;
				pointer-events: auto;
			}

			canvas {
				position: absolute;
				top: 0;
				left: 0;
			}

			#info {
				pointer-events: none;
				position: absolute;
				left: 0;
				top: 0px; width: 100%;
				padding: 5px;
				display: inline-block;
			}

			#error {
				margin: auto;
				margin-top: 40px;
				display: block;
				max-width: 400px;
				padding: 20px;
				background: #CE0808;
			}
		</style>

		<script id="post-vert" type="x-shader/x-vertex">
			varying vec2 vUv;

			void main() {
				vUv = uv;
				gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
			}
		</script>
		<script id="post-frag" type="x-shader/x-fragment">
			#include <packing>

			varying vec2 vUv;
			uniform sampler2D tDiffuse;
			uniform sampler2D tDepth;
			uniform float cameraNear;
			uniform float cameraFar;


			float readDepth (sampler2D depthSampler, vec2 coord) {
				float fragCoordZ = texture2D(depthSampler, coord).x;
				float viewZ = perspectiveDepthToViewZ( fragCoordZ, cameraNear, cameraFar );
				return viewZToOrthographicDepth( viewZ, cameraNear, cameraFar );
			}

			void main() {
				vec3 diffuse = texture2D(tDiffuse, vUv).rgb;
				float depth = readDepth(tDepth, vUv);

				gl_FragColor.rgb = vec3(depth);
				gl_FragColor.a = 1.0;
			}
		</script>

	</head>
	<body>
		<canvas></canvas>
		<div id="info">
			<a href="http://threejs.org" target="_blank">threejs</a> - WebGL - Depth Texture<br/>
			Stores render target depth in a texture attachment.<br/>
			Created by <a href="http://twitter.com/mattdesl" target="_blank">@mattdesl</a>.

			<div id="error" style="display: none;">
			Your browser does not support <strong>WEBGL_depth_texture</strong>.<br/><br/>
			This demo will not work.
			</div>
		</div>

		<script src="../build/three.js"></script>
		<script src="js/shaders/SSAOShader.js"></script>
		<script src="js/controls/OrbitControls.js"></script>

		<script>

			var camera, scene, renderer, controls;
			var target;
			var postScene, postCamera;
			var supportsExtension = true;

			init();
			animate();

			function init() {

				renderer = new THREE.WebGLRenderer( { canvas: document.querySelector('canvas') } );

				if ( !renderer.extensions.get('WEBGL_depth_texture') ) {
					supportsExtension = false;
					document.querySelector('#error').style.display = 'block';
					return;
				}

				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );

				//

				camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 0.01, 50 );
				camera.position.z = -4;

				controls = new THREE.OrbitControls( camera, renderer.domElement );
				controls.enableDamping = true;
				controls.dampingFactor = 0.25;
				controls.rotateSpeed = 0.35;

				// Create a multi render target with Float buffers
				target = new THREE.WebGLRenderTarget( window.innerWidth, window.innerHeight );
				target.texture.format = THREE.RGBFormat;
				target.texture.minFilter = THREE.NearestFilter;
				target.texture.magFilter = THREE.NearestFilter;
				target.texture.generateMipmaps = false;
				target.stencilBuffer = false;
				target.depthBuffer = true;
				target.depthTexture = new THREE.DepthTexture();
				target.depthTexture.type = THREE.UnsignedShortType;

				// Our scene
				scene = new THREE.Scene();
				setupScene();

				// Setup post-processing step
				setupPost();

				onWindowResize();
				window.addEventListener( 'resize', onWindowResize, false );

			}

			function setupPost () {

				// Setup post processing stage
				postCamera = new THREE.OrthographicCamera(-1, 1, 1, -1, 0, 1);
				var postMaterial = new THREE.ShaderMaterial({
					vertexShader: document.querySelector('#post-vert').textContent.trim(),
					fragmentShader: document.querySelector('#post-frag').textContent.trim(),
					uniforms: {
						cameraNear: { value: camera.near },
						cameraFar:  { value: camera.far },
						tDiffuse:   { value: target.texture },
						tDepth:     { value: target.depthTexture }
					}
				});
				var postPlane = new THREE.PlaneGeometry(2, 2);
				var postQuad = new THREE.Mesh(postPlane, postMaterial);
				postScene = new THREE.Scene();
				postScene.add(postQuad);

			}

			function setupScene () {
				var diffuse = new THREE.TextureLoader().load('textures/brick_diffuse.jpg');
				diffuse.wrapS = diffuse.wrapT = THREE.RepeatWrapping;

				// Setup some geometries
				var geometry = new THREE.TorusKnotGeometry(1, 0.3, 128, 64);
				var material = new THREE.MeshBasicMaterial({ color: 'blue' });

				var count = 50;
				var scale = 5;

				for ( var i = 0; i < count; i ++ ) {

					var r = Math.random() * 2.0 * Math.PI;
					var z = (Math.random() * 2.0) - 1.0;
					var zScale = Math.sqrt(1.0 - z * z) * scale;

					var mesh = new THREE.Mesh(geometry, material);
					mesh.position.set(
						Math.cos(r) * zScale,
						Math.sin(r) * zScale,
						z * scale
					);
					mesh.rotation.set(Math.random(), Math.random(), Math.random());
					scene.add(mesh);

				}

			}

			function onWindowResize() {

				var aspect = window.innerWidth / window.innerHeight;
				camera.aspect = aspect;
				camera.updateProjectionMatrix();

				var dpr = renderer.getPixelRatio();
				target.setSize( window.innerWidth * dpr, window.innerHeight * dpr );
				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			function animate() {

				if ( !supportsExtension ) return;

				requestAnimationFrame( animate );
				controls.update();

				// render scene into target
				renderer.render( scene, camera, target );

				// render post FX
				renderer.render( postScene, postCamera );

			}

		</script>

	</body>
</html>