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/**
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 * @author alteredq / http://alteredqualia.com/
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 */
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THREE.EffectComposer = function ( renderer, renderTarget ) {
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	this.renderer = renderer;
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	this.renderTarget1 = renderTarget;
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	if ( this.renderTarget1 === undefined ) {
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		var width = window.innerWidth || 1;
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		var height = window.innerHeight || 1;
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		this.renderTargetParameters = { minFilter: THREE.LinearFilter, magFilter: THREE.LinearFilter, format: THREE.RGBFormat, stencilBuffer: false };
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		this.renderTarget1 = new THREE.WebGLRenderTarget( width, height, this.renderTargetParameters );
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	}
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	this.renderTarget2 = this.renderTarget1.clone();
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	this.writeBuffer = this.renderTarget1;
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	this.readBuffer = this.renderTarget2;
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	this.passes = [];
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	this.copyPass = new THREE.ShaderPass( THREE.ShaderExtras[ "screen" ] );
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};
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THREE.EffectComposer.prototype = {
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	swapBuffers: function() {
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		var tmp = this.readBuffer;
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		this.readBuffer = this.writeBuffer;
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		this.writeBuffer = tmp;
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	},
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	addPass: function ( pass ) {
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		this.passes.push( pass );
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	},
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	render: function ( delta ) {
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		this.writeBuffer = this.renderTarget1;
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		this.readBuffer = this.renderTarget2;
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		var maskActive = false;
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		var pass, i, il = this.passes.length;
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		for ( i = 0; i < il; i ++ ) {
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			pass = this.passes[ i ];
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			if ( !pass.enabled ) continue;
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			pass.render( this.renderer, this.writeBuffer, this.readBuffer, delta, maskActive );
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			if ( pass.needsSwap ) {
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				if ( maskActive ) {
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					var context = this.renderer.context;
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					context.stencilFunc( context.NOTEQUAL, 1, 0xffffffff );
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					this.copyPass.render( this.renderer, this.writeBuffer, this.readBuffer, delta );
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					context.stencilFunc( context.EQUAL, 1, 0xffffffff );
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				}
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				this.swapBuffers();
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			}
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			if ( pass instanceof THREE.MaskPass ) {
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				maskActive = true;
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			} else if ( pass instanceof THREE.ClearMaskPass ) {
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				maskActive = false;
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			}
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		}
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	},
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	reset: function ( renderTarget ) {
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		this.renderTarget1 = renderTarget;
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		if ( this.renderTarget1 === undefined ) {
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			this.renderTarget1 = new THREE.WebGLRenderTarget( window.innerWidth, window.innerHeight, this.renderTargetParameters );
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		}
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		this.renderTarget2 = this.renderTarget1.clone();
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		this.writeBuffer = this.renderTarget1;
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		this.readBuffer = this.renderTarget2;
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		THREE.EffectComposer.quad.scale.set( window.innerWidth, window.innerHeight, 1 );
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		THREE.EffectComposer.camera.left = window.innerWidth / - 2;
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		THREE.EffectComposer.camera.right = window.innerWidth / 2;
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		THREE.EffectComposer.camera.top = window.innerHeight / 2;
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		THREE.EffectComposer.camera.bottom = window.innerHeight / - 2;
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		THREE.EffectComposer.camera.updateProjectionMatrix();
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	}
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};
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// shared ortho camera
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THREE.EffectComposer.initWidth = window.innerWidth || 1;
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THREE.EffectComposer.initHeight = window.innerHeight || 1;
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THREE.EffectComposer.camera = new THREE.OrthographicCamera( THREE.EffectComposer.initWidth / - 2, THREE.EffectComposer.initWidth / 2, THREE.EffectComposer.initHeight / 2, THREE.EffectComposer.initHeight / - 2, -10000, 10000 );
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// shared fullscreen quad scene
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THREE.EffectComposer.geometry = new THREE.PlaneGeometry( 1, 1 );
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THREE.EffectComposer.geometry.applyMatrix( new THREE.Matrix4().makeRotationX( Math.PI / 2 ) );
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THREE.EffectComposer.quad = new THREE.Mesh( THREE.EffectComposer.geometry, null );
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THREE.EffectComposer.quad.position.z = -100;
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THREE.EffectComposer.quad.scale.set( THREE.EffectComposer.initWidth, THREE.EffectComposer.initHeight, 1 );
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THREE.EffectComposer.scene = new THREE.Scene();
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THREE.EffectComposer.scene.add( THREE.EffectComposer.quad );
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THREE.EffectComposer.scene.add( THREE.EffectComposer.camera );
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