javascript
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three.js
mirror of https://github.com/tazdij/three.js.git


			
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							<!DOCTYPE HTML>
<html lang="en">
	<head>
		<title>three.js webgl - deferred rendering</title>
		<meta charset="utf-8" />
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	<body>
		<div id="info">
			<a href="http://threejs.org" target="_blank">three.js</a> - deferred point lights WebGL demo by <a href="http://de.redplant.de" target=_blank>redPlant</a>.<br />
			Walt Disney head by <a href="http://davidoreilly.com/post/18087489343/disneyhead" target="_blank">David OReilly</a><br>
			Point Light attenuation formula by <a href="http://imdoingitwrong.wordpress.com/tag/glsl/" target=_blank>Tom Madams</a>
		</div>
		<div id="container"></div>

		<script src="../build/three.min.js"></script>

		<script src="js/Detector.js"></script>
		<script src="js/libs/stats.min.js"></script>

		<script src="js/shaders/CopyShader.js"></script>

		<script src="js/postprocessing/EffectComposer.js"></script>
		<script src="js/postprocessing/RenderPass.js"></script>
		<script src="js/postprocessing/ShaderPass.js"></script>
		<script src="js/postprocessing/MaskPass.js"></script>

		<script src="js/controls/TrackballControls.js"></script>

		<script src="js/loaders/ctm/lzma.js"></script>
		<script src="js/loaders/ctm/ctm.js"></script>
		<script src="js/loaders/ctm/CTMLoader.js"></script>

		<script src="js/loaders/UTF8Loader.js"></script>
		<script src="js/loaders/MTLLoader.js"></script>

		<script>

			if ( ! Detector.webgl ) Detector.addGetWebGLMessage();

			var WIDTH = window.innerWidth;
			var HEIGHT = window.innerHeight;

			var NEAR = 1.0, FAR = 250.0;
			var VIEW_ANGLE = 45;
			var ASPECT = WIDTH / HEIGHT;

			// core

			var renderer, camera, controls, stats, clock;

			// scenes and scene nodes

			var lightScene, lightNode, scene, sceneNode, emitterScene, emitterNode, quadScene, quadNode;

			// rendertargets

			var rtNormals, rtDepth, rtLightBuffer, rtEmitter;

			// composer

			var compNormals, compDepth, compLightBuffer, compFinal, compEmitter, compositePass;

			// materials

			var matNormal, matClipDepth, matBasic, matUnlit;

			var numLights = 0;
			var lights = new Array();

			// -----------------------
			// shader definitions
			// -----------------------

			var clipdepth_frag = ""+

			"varying vec4 clipPos;"+

			"void main() {"+

				"gl_FragColor = vec4( clipPos.z / clipPos.w, 1.0, 1.0, 1.0 );"+

			"}";


			var clipdepth_vert = "" +

			"varying vec4 clipPos;"+

			"void main() {"+

				"gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );"+
				"clipPos = gl_Position;"+

			"}";


			// -----------------------

			var normals_vert = "" +

			"varying vec3 normalView;"+

			"void main() {"+

				"gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );"+
				"normalView = normalize( normalMatrix * normal );"+

			"}";

			var normals_frag = "" +

			"varying vec3 normalView;"+

			"void main() {"+

				"gl_FragColor = vec4( vec3( normalView * 0.5 + 0.5 ), 1.0 );"+

			"}";

			// -----------------------

			var unlit_vert = "" +

			"varying vec4 clipPos;"+

			"void main() {"+

				"gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );"+
				"clipPos = gl_Position;"+

			"}";

			var unlit_frag = "" +

			"varying vec4 clipPos;"+
			"uniform sampler2D samplerDepth;"+

			"uniform float viewHeight;"+
			"uniform float viewWidth;"+

			"uniform vec3 lightColor;" +

			"void main() {"+

				"vec2 texCoord = gl_FragCoord.xy / vec2( viewWidth, viewHeight );"+
				"float z = texture2D( samplerDepth, texCoord ).x;"+
				"vec4 color = vec4( lightColor, 1.0 );"+
				"float depth = clipPos.z / clipPos.w;"+
				"if( depth > z && z > 0.0 ) color.w = 0.0;"+
				"gl_FragColor = color;"+

			"}";

			// -----------------------

			var deferredlight_vert = "" +

			"varying vec3 lightView;" +
			"uniform vec3 lightPos;" +
			"uniform mat4 matView;" +

			"void main() { " +

				"gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );"+
				"lightView = vec3( matView * vec4( lightPos, 1.0 ) );" +

			"}"

			var deferredlight_frag = "" +

			"varying vec3 lightView;"+

			"uniform sampler2D samplerDepth;"+
			"uniform sampler2D samplerNormals;"+
			"uniform sampler2D samplerLightBuffer;"+

			"uniform float lightRadius;"+
			"uniform float lightIntensity;"+
			"uniform float viewHeight;"+
			"uniform float viewWidth;"+

			"uniform vec3 lightColor;"+

			"uniform mat4 matProjInverse;"+

			"void main() {"+

				"vec2 texCoord = gl_FragCoord.xy / vec2( viewWidth, viewHeight );"+

				"float z = texture2D( samplerDepth, texCoord ).x;"+

				"if ( z == 0.0 ) {"+

					"gl_FragColor = vec4( vec3( 0.0 ), 1.0 );"+
					"return;"+

				"}"+

				"float x = texCoord.x * 2.0 - 1.0;"+
				"float y = texCoord.y * 2.0 - 1.0;"+

				"vec4 projectedPos = vec4( x, y, z, 1.0 );"+

				"vec4 viewPos = matProjInverse * projectedPos;"+
				"viewPos.xyz /= viewPos.w;"+
				"viewPos.w = 1.0;"+

				"vec3 lightDir = lightView - viewPos.xyz;"+
				"float dist = length( lightDir );"+

				"float cutoff = 0.3;"+
				"float denom = dist/lightRadius + 1.0;"+
				"float attenuation = 1.0 / ( denom * denom );"+
				"attenuation = ( attenuation - cutoff ) / ( 1.0 - cutoff );"+
				"attenuation = max( attenuation, 0.0 );"+

				"vec3 normal = texture2D( samplerNormals, texCoord ).xyz * 2.0 - 1.0;" +
				"float diffuse = max( dot( normal, normalize( lightDir ) ), 0.0 );" +

				"vec4 color = vec4( 0.0 );"+
				"color.xyz = lightColor * lightIntensity;"+
				"color.w = attenuation;"+
				"gl_FragColor = color * diffuse;"+

			"}";

			var composite_vert = "" +

			"varying vec2 texCoord;"+

			"void main() {"+

				"vec4 pos = vec4( sign( position.xy ), 0.0, 1.0 );"+
				"texCoord = pos.xy * vec2( 0.5, 0.5 ) + 0.5;"+
				"gl_Position = pos;"+

			"}";

			var composite_frag = "" +

			"varying vec2 texCoord;"+
			"uniform sampler2D samplerLightBuffer;" +
			"uniform sampler2D samplerEmitter;" +
			"uniform vec3 lightPos;" +

			"void main() {" +

				"vec3 color = texture2D( samplerLightBuffer, texCoord ).xyz;" +
				"vec3 emitter = texture2D( samplerEmitter, texCoord ).xyz;"+

				"if ( emitter != vec3( 0.0 ) ) {"+

					"gl_FragColor = vec4( emitter, 1.0 );" +

				"} else {"+

					"gl_FragColor = vec4( color, 1.0 );" +

				"}"+

			"}"

			// -----------------------

			var normalShader = {

				uniforms: {},

				vertexShader: normals_vert,
				fragmentShader: normals_frag

			};

			// -----------------------

			var clipDepthShader = {

				uniforms: {},

				vertexShader: clipdepth_vert,
				fragmentShader: clipdepth_frag

			};

			// -----------------------

			var unlitShader = {

				uniforms: {

					samplerDepth: { type: "t", value: null },
					viewWidth: { type: "f", value: WIDTH },
					viewHeight: { type: "f", value: HEIGHT },
					lightColor: { type: "v3", value: new THREE.Vector3( 0, 0, 0 ) }

				},

				vertexShader: unlit_vert,
				fragmentShader: unlit_frag

			};

			// -----------------------

			var lightShader = {

				uniforms: {

					samplerLightBuffer: { type: "t", value: null },
					samplerNormals: { type: "t", value: null },
					samplerDepth: { type: "t", value: null },
					matView : { type: "m4", value: new THREE.Matrix4() },
					matProjInverse : { type: "m4", value: new THREE.Matrix4() },
					viewWidth: { type: "f", value: WIDTH },
					viewHeight: { type: "f", value: HEIGHT },
					lightPos: { type: "v3", value: new THREE.Vector3( 0, 0, 0 ) },
					lightColor: { type: "v3", value: new THREE.Vector3( 0, 0, 0 ) },
					lightIntensity: { type: "f", value: 1.0 },
					lightRadius: { type: "f", value: 1.0 }

				},

				vertexShader: deferredlight_vert,
				fragmentShader: deferredlight_frag

			};

			// -----------------------

			var compositeShader = {

				uniforms: {

					samplerLightBuffer: { type: "t", value: null },
					samplerEmitter: { type: "t", value: null }
				},

				vertexShader: composite_vert,
				fragmentShader: composite_frag

			};

			// -----------------------------

			function bootstrap() {

				renderer = new THREE.WebGLRenderer();
				renderer.setSize( WIDTH, HEIGHT );
				renderer.setClearColorHex( 0x000000 );

				var container = document.getElementById( 'container' );
				container.appendChild( renderer.domElement );

				// scene camera

				camera = new THREE.PerspectiveCamera( VIEW_ANGLE, ASPECT, NEAR, FAR );
				camera.position.z = 150;

				controls = new THREE.TrackballControls( camera, renderer.domElement );

				// scene for walt's head model

				scene = new THREE.Scene();
				sceneNode = new THREE.Object3D();
				scene.add( sceneNode );
				scene.add( camera );

				// scene for light proxy geometry

				lightScene = new THREE.Scene();
				lightNode = new THREE.Object3D();
				lightScene.add( lightNode );

				// scene for the coloured emitter spheres

				emitterScene = new THREE.Scene();
				emitterNode = new THREE.Object3D();
				emitterScene.add( emitterNode );

				// full screen quad for compositing

				quadScene = new THREE.Scene();
				quadNode = new THREE.Object3D();
				quadScene.add( quadNode );
				quadNode.add( new THREE.Mesh( new THREE.PlaneGeometry( 1, 1 ) ) );

				// stats

				stats = new Stats();
				stats.domElement.style.position = 'absolute';
				stats.domElement.style.top = '8px';
				stats.domElement.style.zIndex = 100;
				container.appendChild( stats.domElement );

				// clock

				clock = new THREE.Clock();

			}

			// -----------------------------

			function createRenderTargets() {

				var rtParams = { minFilter: THREE.NearestFilter, magFilter: THREE.NearestFilter,
							     format: THREE.RGBAFormat, type: THREE.FloatType };

				// ----------------------------------------------------------
				// g-buffer
				// ----------------------------------------------------------

				rtNormals = new THREE.WebGLRenderTarget( WIDTH, HEIGHT, rtParams );
				rtDepth = new THREE.WebGLRenderTarget( WIDTH, HEIGHT, rtParams );

				var passNormals = new THREE.RenderPass( scene, camera );
				compNormals = new THREE.EffectComposer( renderer, rtNormals );
				compNormals.addPass( passNormals );

				var passDepth = new THREE.RenderPass( scene, camera );
				compDepth = new THREE.EffectComposer( renderer, rtDepth );
				compDepth.addPass( passDepth );

				// ----------------------------------------------------------
				// light emitter spheres
				// ----------------------------------------------------------

				var emitterPass = new THREE.RenderPass( emitterScene, camera );
				rtEmitter = new THREE.WebGLRenderTarget( WIDTH, HEIGHT, rtParams );
				compEmitter = new THREE.EffectComposer( renderer, rtEmitter );
				compEmitter.addPass( emitterPass );

				// ----------------------------------------------------------
				// lighting pass
				// ----------------------------------------------------------

				rtLightBuffer = new THREE.WebGLRenderTarget( WIDTH, HEIGHT, rtParams );
				rtLightBuffer.generateMipmaps = false;

				var passLight = new THREE.RenderPass( lightScene, camera );
				compLightBuffer = new THREE.EffectComposer( renderer, rtLightBuffer );
				compLightBuffer.addPass( passLight );

				lightShader.uniforms['samplerNormals'].value = compNormals.renderTarget2;
				lightShader.uniforms['samplerDepth'].value = compDepth.renderTarget2;
				lightShader.uniforms['samplerLightBuffer'].value = rtLightBuffer;

				for ( var x = 0; x < numLights; x ++ ) {

					// setup material

					var matLight = new THREE.ShaderMaterial({

						uniforms:       THREE.UniformsUtils.clone( lightShader.uniforms ),
						vertexShader:   lightShader.vertexShader,
						fragmentShader: lightShader.fragmentShader

					});

					matLight.blending = THREE.AdditiveBlending;
					matLight.transparent = true;
					matLight.depthWrite = false;
					matLight.uniforms["lightPos"].value = lights[x].position;
					matLight.uniforms["lightRadius"].value = lights[x].distance;
					matLight.uniforms["lightIntensity"].value = lights[x].intensity;
					matLight.uniforms["lightColor"].value = lights[x].color;

					// setup proxy geometry for this light

					var geomLight = new THREE.SphereGeometry( lights[x].distance, 16, 10 );
					var meshLight = new THREE.Mesh( geomLight, matLight );
					lightNode.add( meshLight );

					// create emitter sphere

					var geomEmitter = new THREE.SphereGeometry( 0.7, 7, 7 );
					var matEmitter = new THREE.ShaderMaterial({

						uniforms:       THREE.UniformsUtils.clone( unlitShader.uniforms ),
						vertexShader:   unlitShader.vertexShader,
						fragmentShader: unlitShader.fragmentShader

					});

					var meshEmitter = new THREE.Mesh( geomEmitter, matEmitter );
					meshEmitter.position = lights[ x ].position;
					emitterNode.add( meshEmitter );

					// add emitter to light node

					meshLight.emitter = meshEmitter;

				}

				// ----------------------------------------------------------
				// composite
				// ----------------------------------------------------------

				compositeShader.uniforms['samplerLightBuffer'].value = compLightBuffer.renderTarget2;
				compositeShader.uniforms['samplerEmitter'].value = compEmitter.renderTarget2;

				compositePass = new THREE.ShaderPass( compositeShader );
				compositePass.needsSwap = true;
				compositePass.renderToScreen = true;

				compFinal = new THREE.EffectComposer( renderer );
				compFinal.addPass( compositePass );

			}

			// -----------------------------

			function initScene( object ) {

				object.traverse( function( node ) {

					if ( node.material ) {

						node.material = new THREE.MeshBasicMaterial();

					}

				} );

				object.position.y = -35;
				sceneNode.add( object );

			}

			// -----------------------------

			function initMaterials() {


				matNormal = new THREE.ShaderMaterial({

					uniforms:       normalShader.uniforms,
					vertexShader:   normalShader.vertexShader,
					fragmentShader: normalShader.fragmentShader

				});

				matClipDepth = new THREE.ShaderMaterial({

					uniforms:       clipDepthShader.uniforms,
					vertexShader:   clipDepthShader.vertexShader,
					fragmentShader: clipDepthShader.fragmentShader

				});

			}

			// -----------------------------

			function initLights() {

				var distance = 50;

				var tmp = new THREE.PointLight();
				tmp.color = new THREE.Vector3( 0.0, 0.0, 1.0 );
				tmp.intensity = 1.0;
				tmp.distance = distance;
				lights[ 0 ] = tmp;

				var tmp = new THREE.PointLight();
				tmp.color = new THREE.Vector3( 0.0, 1.0, 0.0 );
				tmp.intensity = 1.0;
				tmp.distance = distance;
				lights[ 1 ] = tmp;

				var tmp = new THREE.PointLight();
				tmp.color = new THREE.Vector3( 1.0, 0.0, 0.0 );
				tmp.intensity = 1.0;
				tmp.distance = distance;
				lights[ 2 ] = tmp;

				var tmp = new THREE.PointLight();
				tmp.color = new THREE.Vector3( 0.0, 1.0, 1.0 );
				tmp.intensity = 1.0;
				tmp.distance = distance;
				lights[ 3 ] = tmp;

				numLights = 4;

			}

			// -----------------------------

			function animate() {

				var delta = clock.getDelta();

				requestAnimationFrame( animate );

				controls.update( delta );
				stats.update();
				render();

			}

			// -----------------------------

			function render() {

				// -----------------------------
				// g-buffer depth
				// -----------------------------

				sceneNode.traverse( function( node ) {

					if ( node.material ) {

						node.material = matClipDepth;

					}

				} );

				compDepth.render();

				// -----------------------------
				// g-buffer normals
				// -----------------------------

				sceneNode.traverse( function( node ) {

					if ( node.material ) {

						node.material = matNormal;

					}

				} );

				compNormals.render();

				// -----------------------------
				// emitter pass
				// -----------------------------

				for ( var idx in lightNode.children ) {

					var light = lightNode.children[idx];
					var color = light.material.uniforms["lightColor"].value;
					var emitter = light.emitter;
					emitter.material.uniforms['samplerDepth'].value = compDepth.renderTarget2;
					emitter.material.uniforms["lightColor"].value = color;

				}

				compEmitter.render();

				// -----------------------------
				// light pass
				// -----------------------------

				for ( var idx in lightNode.children ) {

					camera.projectionMatrixInverse.getInverse( camera.projectionMatrix );
					lightNode.children[idx].material.uniforms["matProjInverse"].value = camera.projectionMatrixInverse;
					lightNode.children[idx].material.uniforms["matView"].value = camera.matrixWorldInverse;

				}

				var time = Date.now() * 0.0005;

				// update lights

				var lightPosition = lightNode.children[0].material.uniforms["lightPos"].value;
				lightPosition.x = Math.sin( time * 0.7 ) * 30;
				lightPosition.y = Math.cos( time * 0.5 ) * 40;
				lightPosition.z = Math.cos( time * 0.3 ) * 30;
				lightNode.children[0].emitter.position = lightPosition;
				lightNode.children[0].position = lightPosition;
				lightNode.children[0].frustumCulled = false;

				lightPosition = lightNode.children[1].material.uniforms["lightPos"].value;
				lightPosition.x = Math.sin( time * 0.5 ) * 30;
				lightPosition.y = Math.cos( time * 0.5 ) * 40;
				lightPosition.z = Math.cos( time * 0.7 ) * 30;
				lightNode.children[1].emitter.position = lightPosition;
				lightNode.children[1].position = lightPosition;
				lightNode.children[1].frustumCulled = false;

				lightPosition = lightNode.children[2].material.uniforms["lightPos"].value;
				lightPosition.x = Math.sin( time * 0.7 ) * 30;
				lightPosition.y = Math.cos( time * 0.3 ) * 40;
				lightPosition.z = Math.cos( time * 0.5 ) * 30;
				lightNode.children[2].emitter.position = lightPosition;
				lightNode.children[2].position = lightPosition;
				lightNode.children[2].frustumCulled = false;

				lightPosition = lightNode.children[3].material.uniforms["lightPos"].value;
				lightPosition.x = Math.sin( time * 0.3 ) * 30;
				lightPosition.y = Math.cos( time * 0.7 ) * 40;
				lightPosition.z = Math.cos( time * 0.5 ) * 30;
				lightNode.children[3].emitter.position = lightPosition;
				lightNode.children[3].position = lightPosition;
				lightNode.children[3].frustumCulled = false;

				compLightBuffer.render();

				// -----------------------------
				// composite pass
				// -----------------------------

				compFinal.render();

			}

			// -----------------------------
			// entry point
			// -----------------------------

			var loader = new THREE.UTF8Loader();

			loader.load( "models/utf8/WaltHi.js", function ( object ) {

				bootstrap();
				initScene( object );
				initMaterials();
				initLights();
				createRenderTargets();
				animate();

			}, { normalizeRGB: true } );

		</script>
	</body>

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