examples/webgl_materials_blending_custom.html

<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - materials - custom blending</title>
		<meta charset="utf-8">
		<style>
			body {
				margin: 0px;
				background-color: #111;
				overflow: hidden;
				font-family: arial;
			}

			.menu { color: #fff; font-weight: bold; font-size: 12px; z-index: 100; width: 75px; position: absolute; top: 0px; padding: 16px; }
			.menu img, .menu canvas { width: 75px; margin: 10px 0 }

			#images { background: rgba(0,0,0,0); left: 0px; }
			#backgrounds { background: rgba(0,0,0,0.0); left: 107px; }
			#labels { background: rgba(0,0,0,0.75); left: 214px; width: 100px }

			.lbl { color: #fff; z-index: 150; float:left; padding: 0.25em; width: 75px; display: block  }
			#lbl_dst { background:#800; }
			#lbl_src { background:green; }

			.btn { background: darkorange; width: 100px; cursor: pointer }

			#btn_sub { background: transparent }
			#btn_rsub { background: transparent }

			#btn_pre { background: transparent }

			#btn_rsub, #btn_nopre { margin-bottom: 2em }
		</style>
	</head>
	<body>

		<div id="images" class="menu">
			Foreground
			<a id="img_0" href="#"><img src="textures/disturb.jpg" /></a>
			<a id="img_1" href="#"><img src="textures/sprite0.jpg" /></a>
			<a id="img_2" href="#"><img src="textures/sprite0.png" /></a>
			<a id="img_3" href="#"><img src="textures/lensflare/lensflare0.png" /></a>
			<a id="img_4" href="#"><img src="textures/lensflare/lensflare0_alpha.png" /></a>
			<a id="img_5" href="#"><img src="textures/sprites/ball.png" /></a>
			<a id="img_6" href="#"><img src="textures/sprites/snowflake7_alpha.png" /></a>
		</div>

		<div id="backgrounds" class="menu">
			Background
			<a id="bg_0" href="#"><img src="textures/disturb.jpg" /></a>
			<a id="bg_1" href="#"></a>
			<a id="bg_2" href="#"></a>
			<a id="bg_3" href="#"><img src="textures/crate.gif" /></a>
			<a id="bg_4" href="#"><img src="textures/lava/lavatile.jpg" /></a>
			<a id="bg_5" href="#"><img src="textures/water.jpg" /></a>
			<a id="bg_6" href="#"><img src="textures/lava/cloud.png" /></a>
		</div>

		<div id="labels" class="menu">
			Equation<br/><br/>
			<div class="lbl btn" id="btn_add">Add</div>
			<div class="lbl btn" id="btn_sub">Subtract</div>
			<div class="lbl btn" id="btn_rsub">ReverseSubtract</div>

			Premultiply alpha<br/><br/>
			<div class="lbl btn" id="btn_pre">On</div>
			<div class="lbl btn" id="btn_nopre">Off</div>

			Labels<br/><br/>
			<div class="lbl" id="lbl_src">Source</div>
			<div class="lbl" id="lbl_dst">Destination</div>
		</div>

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

		<script>

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

			var SCREEN_WIDTH = window.innerWidth - 215;
			var SCREEN_HEIGHT = window.innerHeight;

			var camera, scene, renderer;

			var materialBg;
			var materials = [];

			var mapsPre = [];
			var mapsNoPre = [];

			var currentMaps = mapsNoPre;
			var currentIndex = 4;

			init();
			animate();

			function init() {

				// CAMERA

				camera = new THREE.PerspectiveCamera( 70, SCREEN_WIDTH / SCREEN_HEIGHT, 1, 1000 );
				camera.position.z = 700;

				// SCENE

				scene = new THREE.Scene();

				// BACKGROUND IMAGES

				var x = document.createElement( "canvas" );
				var xc = x.getContext( "2d" );
				x.width = x.height = 128;
				xc.fillStyle = "#eee";
				xc.fillRect( 0, 0, 128, 128 );
				xc.fillStyle = "#999";
				xc.fillRect( 0, 0, 64, 64 );
				xc.fillStyle = "#aaa";
				xc.fillRect( 32, 32, 32, 32 );
				xc.fillStyle = "#999";
				xc.fillRect( 64, 64, 64, 64 );
				xc.fillStyle = "#bbb";
				xc.fillRect( 96, 96, 32, 32 );

				document.getElementById("bg_1").appendChild( x );

				var x2 = document.createElement( "canvas" );
				var xc2 = x2.getContext( "2d" );
				x2.width = x2.height = 128;
				xc2.fillStyle = "#444";
				xc2.fillRect( 0, 0, 128, 128 );
				xc2.fillStyle = "#000";
				xc2.fillRect( 0, 0, 64, 64 );
				xc2.fillStyle = "#111";
				xc2.fillRect( 32, 32, 32, 32 );
				xc2.fillStyle = "#000";
				xc2.fillRect( 64, 64, 64, 64 );
				xc2.fillStyle = "#222";
				xc2.fillRect( 96, 96, 32, 32 );

				document.getElementById("bg_1").appendChild( x );
				document.getElementById("bg_2").appendChild( x2 );

				var mapBg0 = new THREE.Texture( x );
				mapBg0.wrapS = mapBg0.wrapT = THREE.RepeatWrapping;
				mapBg0.repeat.set( 128, 64 );
				mapBg0.needsUpdate = true;

				var mapBg1 = new THREE.Texture( x2 );
				mapBg1.wrapS = mapBg1.wrapT = THREE.RepeatWrapping;
				mapBg1.repeat.set( 128, 64 );
				mapBg1.needsUpdate = true;

				var mapBg2 = THREE.ImageUtils.loadTexture( "textures/disturb.jpg" );
				mapBg2.wrapS = mapBg2.wrapT = THREE.RepeatWrapping;
				mapBg2.repeat.set( 8, 4 );

				var mapBg3 = THREE.ImageUtils.loadTexture( "textures/crate.gif" );
				mapBg3.wrapS = mapBg3.wrapT = THREE.RepeatWrapping;
				mapBg3.repeat.set( 32, 16 );

				var mapBg4 = THREE.ImageUtils.loadTexture( "textures/lava/lavatile.jpg" );
				mapBg4.wrapS = mapBg4.wrapT = THREE.RepeatWrapping;
				mapBg4.repeat.set( 8, 4 );

				var mapBg5 = THREE.ImageUtils.loadTexture( "textures/water.jpg" );
				mapBg5.wrapS = mapBg5.wrapT = THREE.RepeatWrapping;
				mapBg5.repeat.set( 8, 4 );

				var mapBg6 = THREE.ImageUtils.loadTexture( "textures/lava/cloud.png" );
				mapBg6.wrapS = mapBg6.wrapT = THREE.RepeatWrapping;
				mapBg6.repeat.set( 2, 1 );

				// BACKGROUND

				materialBg = new THREE.MeshBasicMaterial( { map: mapBg1 } );

				var meshBg = new THREE.Mesh( new THREE.PlaneGeometry( 4000, 2000 ), materialBg );
				meshBg.position.set( 0, 0, -1 );
				scene.add( meshBg );

				// FOREGROUND IMAGES

				var images = [ 'textures/disturb.jpg',
							   'textures/sprite0.jpg',
							   'textures/sprite0.png',
							   'textures/lensflare/lensflare0.png',
							   'textures/lensflare/lensflare0_alpha.png',
							   'textures/sprites/ball.png',
							   'textures/sprites/snowflake7_alpha.png' ];

				for ( var i = 0; i < images.length; i ++ ) {

					var map = THREE.ImageUtils.loadTexture( images[ i ] );

					var mapPre = map.clone();

					mapPre.premultiplyAlpha = true;
					mapPre.needsUpdate = true;

					mapsNoPre.push( map );
					mapsPre.push( mapPre );

				}

				// FOREGROUND OBJECTS

				var blendings = [ "NoBlending", "NormalBlending", "AdditiveBlending", "SubtractiveBlending", "MultiplyBlending", "AdditiveAlphaBlending" ];

				var src = [ "ZeroFactor", "OneFactor", "SrcAlphaFactor", "OneMinusSrcAlphaFactor", "DstAlphaFactor", "OneMinusDstAlphaFactor", "DstColorFactor", "OneMinusDstColorFactor", "SrcAlphaSaturateFactor" ];
				var dst = [ "ZeroFactor", "OneFactor", "SrcColorFactor", "OneMinusSrcColorFactor", "SrcAlphaFactor", "OneMinusSrcAlphaFactor", "DstAlphaFactor", "OneMinusDstAlphaFactor" ];

				var geo1 = new THREE.PlaneGeometry( 100, 100 );
				var geo2 = new THREE.PlaneGeometry( 100, 25 );

				var blending = "CustomBlending";

				for ( var i = 0; i < dst.length; i ++ ) {

					var blendDst = dst[ i ];

					for ( var j = 0; j < src.length; j ++ ) {

						var blendSrc = src[ j ];

						var material = new THREE.MeshBasicMaterial( { map: currentMaps[ currentIndex ] } );
						material.transparent = true;

						material.blending = THREE[ blending ];
						material.blendSrc = THREE[ blendSrc ];
						material.blendDst = THREE[ blendDst ];
						material.blendEquation = THREE.AddEquation;

						var x = ( j - src.length / 2 ) * 110;
						var z = 0;
						var y = ( i - dst.length / 2 ) * 110 + 50;

						var mesh = new THREE.Mesh( geo1, material );
						mesh.position.set( x, y, z );
						mesh.matrixAutoUpdate = false;
						mesh.updateMatrix();
						scene.add( mesh );

						materials.push( material );

					}

				}

				for ( var j = 0; j < src.length; j ++ ) {

					var blendSrc = src[ j ];

					var x = ( j - src.length / 2 ) * 110;
					var z = 0;
					var y = ( 0 - dst.length / 2 ) * 110 + 50;

					var mesh = new THREE.Mesh( geo2, generateLabelMaterial( blendSrc.replace( "Factor", "" ), "rgba( 0, 150, 0, 1 )" ) );
					mesh.position.set( x, - (y - 70), z );
					mesh.matrixAutoUpdate = false;
					mesh.updateMatrix();
					scene.add( mesh );

				}

				for ( var i = 0; i < dst.length; i ++ ) {

					var blendDst = dst[ i ];

					var x = ( 0 - src.length / 2 ) * 110 - 125;
					var z = 0;
					var y = ( i - dst.length / 2 ) * 110 + 165;

					var mesh = new THREE.Mesh( geo2, generateLabelMaterial( blendDst.replace( "Factor", "" ), "rgba( 150, 0, 0, 1 )" ) );
					mesh.position.set( x, - (y - 70), z );
					mesh.matrixAutoUpdate = false;
					mesh.updateMatrix();
					scene.add( mesh );

				}

				// RENDERER

				renderer = new THREE.WebGLRenderer( { clearColor: 0x000000, clearAlpha: 1 } );
				renderer.setSize( SCREEN_WIDTH, SCREEN_HEIGHT );

				renderer.domElement.style.position = "absolute";
				renderer.domElement.style.left = "215px";

				document.body.appendChild( renderer.domElement );

				// EVENTS

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

				addImgHandler( "img_0", 0 );
				addImgHandler( "img_1", 1 );
				addImgHandler( "img_2", 2 );
				addImgHandler( "img_3", 3 );
				addImgHandler( "img_4", 4 );
				addImgHandler( "img_5", 5 );
				addImgHandler( "img_6", 6 );

				addBgHandler( "bg_0", mapBg2 );
				addBgHandler( "bg_1", mapBg0 );
				addBgHandler( "bg_2", mapBg1 );
				addBgHandler( "bg_3", mapBg3 );
				addBgHandler( "bg_4", mapBg4 );
				addBgHandler( "bg_5", mapBg5 );
				addBgHandler( "bg_6", mapBg6 );

				addEqHandler( "btn_add", THREE.AddEquation );
				addEqHandler( "btn_sub", THREE.SubtractEquation );
				addEqHandler( "btn_rsub", THREE.ReverseSubtractEquation );

				addPreHandler( "btn_pre", mapsPre );
				addPreHandler( "btn_nopre", mapsNoPre );

			}

			//

			function addImgHandler( id, index ) {

				var el = document.getElementById( id );

				el.addEventListener( 'click', function () {

					for ( var i = 0; i < materials.length; i ++ ) {

						materials[ i ].map = currentMaps[ index ];

					}

					currentIndex = index;

				} );

			}

			function addEqHandler( id, eq ) {

				var el = document.getElementById( id );

				el.addEventListener( 'click', function () {

					for ( var i = 0; i < materials.length; i ++ ) {

						materials[ i ].blendEquation = eq;

					}

					document.getElementById( "btn_add" ).style.backgroundColor = "transparent";
					document.getElementById( "btn_sub" ).style.backgroundColor = "transparent";
					document.getElementById( "btn_rsub" ).style.backgroundColor = "transparent";

					el.style.backgroundColor = "darkorange";

				});

			}

			function addBgHandler( id, map ) {

				var el = document.getElementById( id );
				el.addEventListener( 'click', function () { materialBg.map = map; }	);

			}

			function addPreHandler( id, marray ) {

				var el = document.getElementById( id );
				el.addEventListener( 'click', function () {

					currentMaps = marray;

					for ( var i = 0; i < materials.length; i ++ ) {

						materials[ i ].map = currentMaps[ currentIndex ];

					}

					document.getElementById( "btn_pre" ).style.backgroundColor = "transparent";
					document.getElementById( "btn_nopre" ).style.backgroundColor = "transparent";

					el.style.backgroundColor = "darkorange";

				} );

			}

			//

			function onWindowResize( event ) {

				SCREEN_WIDTH = window.innerWidth;
				SCREEN_HEIGHT = window.innerHeight;

				renderer.setSize( SCREEN_WIDTH, SCREEN_HEIGHT );

				camera.aspect = SCREEN_WIDTH / SCREEN_HEIGHT;
				camera.updateProjectionMatrix();

			}

			//

			function generateLabelMaterial( text, bg ) {

				var x = document.createElement( "canvas" );
				var xc = x.getContext( "2d" );
				x.width = 128;
				x.height = 32;

				xc.fillStyle = bg;
				xc.fillRect( 0, 0, 128, 32 );

				//xc.shadowColor = "#000";
				//xc.shadowBlur = 3;
				xc.fillStyle = "white";
				xc.font = "10pt arial bold";
				xc.fillText( text, 8, 22 );

				var map = new THREE.Texture( x );
				map.needsUpdate = true;

				var material = new THREE.MeshBasicMaterial( { map: map, transparent: true } );
				return material;

			}

			function animate() {

				requestAnimationFrame( animate );

				var time = Date.now() * 0.00025;
				var ox = ( time * -0.01 * materialBg.map.repeat.x ) % 1;
				var oy = ( time * -0.01 * materialBg.map.repeat.y ) % 1;
				//var oy = Math.sin( 0.75 * time ) * 0.01 * materialBg.map.repeat.y;

				materialBg.map.offset.set( ox, oy );

				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>