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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - tiled forward lighting</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
		<style>
			body {
				font-family: Monospace;
				background-color: #101010;
				color: #fff;
				margin: 0px;
				overflow: hidden;
			}
			a { color: #f00; }

			#info {
				position: absolute;
				left: 0;
				top: 0px; width: 100%;
				padding: 5px;
				display: inline-block;
				text-align:center;
			}
		</style>
	</head>
	<body>
		<div id="info">
			<a href="http://threejs.org" target="_blank" rel="noopener">threejs</a> - Tiled forward lighting<br/>
			Created by <a href="https://github.com/wizgrav" target="_blank" rel="noopener">wizgrav</a>.
		</div>
		<script src="../build/three.js"></script>
		<script src="js/loaders/OBJLoader.js"></script>
		<script src="js/controls/OrbitControls.js"></script>
		<script src="js/postprocessing/EffectComposer.js"></script>
		<script src="js/postprocessing/RenderPass.js"></script>
		<script src="js/postprocessing/MaskPass.js"></script>
		<script src="js/postprocessing/ShaderPass.js"></script>
		<script src="js/shaders/CopyShader.js"></script>
		<script src="js/shaders/ConvolutionShader.js"></script>
		<script src="js/shaders/LuminosityHighPassShader.js"></script>
		<script src="js/postprocessing/UnrealBloomPass.js"></script>
		<script src="js/WebGL.js"></script>
		<script src="js/libs/stats.min.js"></script>

		<script>

		// Simple form of tiled forward lighting
		// using texels as bitmasks of 32 lights

		var RADIUS = 75;

		THREE.ShaderChunk[ 'lights_pars_begin' ] += [
			'',
			'#if defined TILED_FORWARD',
			'uniform vec4 tileData;',
			'uniform sampler2D tileTexture;',
			'uniform sampler2D lightTexture;',
			'#endif'
		].join( '\n' );

		THREE.ShaderChunk[ 'lights_fragment_end' ] += [
			'',
			'#if defined TILED_FORWARD',
			'vec2 tUv = floor(gl_FragCoord.xy / tileData.xy * 32.) / 32. + tileData.zw;',
			'vec4 tile = texture2D(tileTexture, tUv);',
			'for (int i=0; i < 4; i++) {',
			'	float tileVal = tile.x * 255.;',
			'  	tile.xyzw = tile.yzwx;',
			'	if(tileVal == 0.){ continue; }',
			'  	float tileDiv = 128.;',
			'	for (int j=0; j < 8; j++) {',
			'  		if (tileVal < tileDiv) {  tileDiv *= 0.5; continue; }',
			'		tileVal -= tileDiv;',
			'		tileDiv *= 0.5;',
			'  		PointLight pointlight;',
			'		float uvx = (float(8 * i + j) + 0.5) / 32.;',
			'  		vec4 lightData = texture2D(lightTexture, vec2(uvx, 0.));',
			'  		vec4 lightColor = texture2D(lightTexture, vec2(uvx, 1.));',
			'  		pointlight.position = lightData.xyz;',
			'  		pointlight.distance = lightData.w;',
			'  		pointlight.color = lightColor.rgb;',
			'  		pointlight.decay = lightColor.a;',
			'  		getPointDirectLightIrradiance( pointlight, geometry, directLight );',
			'		RE_Direct( directLight, geometry, material, reflectedLight );',
			'	}',
			'}',
			'#endif'
		].join( '\n' );

		var lights = [];

		var State = {
			rows: 0,
			cols: 0,
			width: 0,
			height: 0,
			tileData: { value: null },
			tileTexture: { value: null },
			lightTexture: {
				value: new THREE.DataTexture( new Float32Array( 32 * 2 * 4 ), 32, 2, THREE.RGBAFormat, THREE.FloatType )
			},
		};

		function resizeTiles() {

			var width = window.innerWidth;
			var height = window.innerHeight;

			State.width = width;
			State.height = height;
			State.cols = Math.ceil( width / 32 );
			State.rows = Math.ceil( height / 32 );
			State.tileData.value = [ width, height, 0.5 / Math.ceil( width / 32 ), 0.5 / Math.ceil( height / 32 ) ];
			State.tileTexture.value = new THREE.DataTexture( new Uint8Array( State.cols * State.rows * 4 ), State.cols, State.rows );

		}

		// Generate the light bitmasks and store them in the tile texture
		function tileLights( renderer, scene, camera ) {

			if ( ! camera.projectionMatrix ) return;

			var d = State.tileTexture.value.image.data;
			var ld = State.lightTexture.value.image.data;

			var viewMatrix = camera.matrixWorldInverse;

			d.fill( 0 );

			var vector = new THREE.Vector3();

			lights.forEach( function ( light, index ) {

				vector.setFromMatrixPosition( light.matrixWorld );

				var bs = lightBounds( camera, vector, light._light.radius );

				vector.applyMatrix4( viewMatrix );
				vector.toArray( ld, 4 * index );
				ld[ 4 * index + 3 ] = light._light.radius;
				light._light.color.toArray( ld, 32 * 4 + 4 * index );
				ld[ 32 * 4 + 4 * index + 3 ] = light._light.decay;

				if ( bs[ 1 ] < 0 || bs[ 0 ] > State.width || bs[ 3 ] < 0 || bs[ 2 ] > State.height ) return;
				if ( bs[ 0 ] < 0 ) bs[ 0 ] = 0;
				if ( bs[ 1 ] > State.width ) bs[ 1 ] = State.width;
				if ( bs[ 2 ] < 0 ) bs[ 2 ] = 0;
				if ( bs[ 3 ] > State.height ) bs[ 3 ] = State.height;

				var i4 = Math.floor( index / 8 ), i8 = 7 - ( index % 8 );

				for ( var i = Math.floor( bs[ 2 ] / 32 ); i <= Math.ceil( bs[ 3 ] / 32 ); i ++ ) {

					for ( var j = Math.floor( bs[ 0 ] / 32 ); j <= Math.ceil( bs[ 1 ] / 32 ); j ++ ) {

						d[ ( State.cols * i + j ) * 4 + i4 ] |= 1 << i8;

					}

				}

			} );

			State.tileTexture.value.needsUpdate = true;
			State.lightTexture.value.needsUpdate = true;

		}

		// Screen rectangle bounds from light sphere's world AABB
		var lightBounds = function () {

			var v = new THREE.Vector3();
			return function ( camera, pos, r ) {

				var minX = State.width, maxX = 0, minY = State.height, maxY = 0, hw = State.width / 2, hh = State.height / 2;

				for ( var i = 0; i < 8; i ++ ) {

					v.copy( pos );
					v.x += i & 1 ? r : - r;
					v.y += i & 2 ? r : - r;
					v.z += i & 4 ? r : - r;
					var vector = v.project( camera );
					var x = ( vector.x * hw ) + hw;
					var y = ( vector.y * hh ) + hh;
					minX = Math.min( minX, x );
					maxX = Math.max( maxX, x );
					minY = Math.min( minY, y );
					maxY = Math.max( maxY, y );

				}

				return [ minX, maxX, minY, maxY ];

			};

		}();


		// Rendering

		var container = document.createElement( 'div' );
		document.body.appendChild( container );
		var camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 2000 );
		camera.position.set( 0.0, 0.0, 240.0 );
		var scene = new THREE.Scene();
		scene.background = new THREE.Color( 0x111111 );

		var renderer = new THREE.WebGLRenderer();
		renderer.toneMapping = THREE.LinearToneMapping;
		container.appendChild( renderer.domElement );

		var renderTarget = new THREE.WebGLRenderTarget();

		scene.add( new THREE.AmbientLight( 0xffffff, 0.33 ) );
		// At least one regular Pointlight is needed to activate light support
		scene.add( new THREE.PointLight( 0xff0000, 0.1, 0.1 ) );

		var bloom = new THREE.UnrealBloomPass( new THREE.Vector2(), 0.8, 0.6, 0.8 );
		bloom.renderToScreen = true;

		var stats = new Stats();
		container.appendChild( stats.dom );

		var controls = new THREE.OrbitControls( camera, renderer.domElement );
		controls.minDistance = 120;
		controls.maxDistance = 320;

		var materials = [];

		var Heads = [
			{ type: 'physical', uniforms: { diffuse: 0x888888, metalness: 1.0, roughness: 0.66 }, defines: {} },
			{ type: 'standard', uniforms: { diffuse: 0x666666, metalness: 0.1, roughness: 0.33 }, defines: {} },
			{ type: 'phong', uniforms: { diffuse: 0x777777, shininess: 20 }, defines: {} },
			{ type: 'phong', uniforms: { diffuse: 0x555555, shininess: 10 }, defines: { TOON: 1 } }
		];

		function init( geom ) {

			var sphereGeom = new THREE.SphereBufferGeometry( 0.5, 32, 32 );
			var tIndex = Math.round( Math.random() * 3 );

			Object.keys( Heads ).forEach( function ( t, index ) {

				var g = new THREE.Group();
				var conf = Heads[ t ];
				var ml = THREE.ShaderLib[ conf.type ];
				var mtl = new THREE.ShaderMaterial( {
					lights: true,
					fragmentShader: ml.fragmentShader,
					vertexShader: ml.vertexShader,
					uniforms: THREE.UniformsUtils.clone( ml.uniforms ),
					defines: conf.defines,
					transparent: tIndex === index ? true : false,
				} );

				mtl.uniforms.opacity.value = tIndex === index ? 0.9 : 1;
				mtl.uniforms.tileData = State.tileData;
				mtl.uniforms.tileTexture = State.tileTexture;
				mtl.uniforms.lightTexture = State.lightTexture;

				for ( var u in conf.uniforms ) {

					var vu = conf.uniforms[ u ];

					if ( mtl.uniforms[ u ].value.set ) {

						mtl.uniforms[ u ].value.set( vu );

					} else {

						mtl.uniforms[ u ].value = vu;

					}

				}

				mtl.defines[ 'TILED_FORWARD' ] = 1;
				materials.push( mtl );

				var obj = new THREE.Mesh( geom, mtl );
				obj.position.y = - 37;
				mtl.side = tIndex === index ? THREE.FrontSide : THREE.DoubleSide;

				g.rotation.y = index * Math.PI / 2;
				g.position.x = Math.sin( index * Math.PI / 2 ) * RADIUS;
				g.position.z = Math.cos( index * Math.PI / 2 ) * RADIUS;
				g.add( obj );

				for ( var i = 0; i < 8; i ++ ) {

					var color = new THREE.Color().setHSL( Math.random(), 1.0, 0.5 );
					var l = new THREE.Group();

					l.add( new THREE.Mesh(
						sphereGeom,
						new THREE.MeshBasicMaterial( {
							color: color
						} )
					) );

					l.add( new THREE.Mesh(
						sphereGeom,
						new THREE.MeshBasicMaterial( {
							color: color,
							transparent: true,
							opacity: 0.033
						} )
					) );

					l.children[ 1 ].scale.set( 6.66, 6.66, 6.66 );

					l._light = {
						color: color,
						radius: RADIUS,
						decay: 1,
						sy: Math.random(),
						sr: Math.random(),
						sc: Math.random(),
						py: Math.random() * Math.PI,
						pr: Math.random() * Math.PI,
						pc: Math.random() * Math.PI,
						dir: Math.random() > 0.5 ? 1 : - 1
					};

					lights.push( l );
					g.add( l );

				}

				scene.add( g );

			} );

		}

		function update( now ) {

			lights.forEach( function ( l ) {

				var ld = l._light;
				var radius = 0.8 + 0.2 * Math.sin( ld.pr + ( 0.6 + 0.3 * ld.sr ) * now );
				l.position.x = ( Math.sin( ld.pc + ( 0.8 + 0.2 * ld.sc ) * now * ld.dir ) ) * radius * RADIUS;
				l.position.z = ( Math.cos( ld.pc + ( 0.8 + 0.2 * ld.sc ) * now * ld.dir ) ) * radius * RADIUS;
				l.position.y = Math.sin( ld.py + ( 0.8 + 0.2 * ld.sy ) * now ) * radius * 32;

			} );

		}

		function resize() {

			renderer.setPixelRatio( window.devicePixelRatio );
			renderer.setSize( window.innerWidth, window.innerHeight );
			renderTarget.setSize( window.innerWidth, window.innerHeight );
			bloom.setSize( window.innerWidth, window.innerHeight );
			camera.aspect = window.innerWidth / window.innerHeight;
			camera.updateProjectionMatrix();
			resizeTiles();

		}

		function postEffect( renderer ) {

			bloom.render( renderer, null, renderTarget );

		}

		scene.onBeforeRender = tileLights;

		scene.onAfterRender = postEffect;

		var loader = new THREE.OBJLoader();

		loader.load( 'models/obj/walt/WaltHead.obj', function ( object ) {

			var geometry = object.children[ 0 ].geometry;

			window.addEventListener( 'resize', resize );

			init( geometry );
			resize();

			renderer.setAnimationLoop( function ( time ) {

				update( time / 1000 );
				stats.begin();
				renderer.render( scene, camera, renderTarget );
				stats.end();

			} );

		} );

		</script>
	</body>
</html>