text: /**
   * @author alteredq / http://alteredqualia.com/
   */
  
  THREE.EffectComposer = function ( renderer, renderTarget ) {
  
  	this.renderer = renderer;
  
  	if ( renderTarget === undefined ) {
  
  		var parameters = {
  			minFilter: THREE.LinearFilter,
  			magFilter: THREE.LinearFilter,
  			format: THREE.RGBAFormat,
  			stencilBuffer: false
  		};
  
  		var size = renderer.getDrawingBufferSize( new THREE.Vector2() );
  		renderTarget = new THREE.WebGLRenderTarget( size.width, size.height, parameters );
  		renderTarget.texture.name = 'EffectComposer.rt1';
  
  	}
  
  	this.renderTarget1 = renderTarget;
  	this.renderTarget2 = renderTarget.clone();
  	this.renderTarget2.texture.name = 'EffectComposer.rt2';
  
  	this.writeBuffer = this.renderTarget1;
  	this.readBuffer = this.renderTarget2;
  
  	this.passes = [];
  
  	// dependencies
  
  	if ( THREE.CopyShader === undefined ) {
  
  		console.error( 'THREE.EffectComposer relies on THREE.CopyShader' );
  
  	}
  
  	if ( THREE.ShaderPass === undefined ) {
  
  		console.error( 'THREE.EffectComposer relies on THREE.ShaderPass' );
  
  	}
  
  	this.copyPass = new THREE.ShaderPass( THREE.CopyShader );
  
  	this._previousFrameTime = Date.now();
  
  };
  
  Object.assign( THREE.EffectComposer.prototype, {
  
  	swapBuffers: function () {
  
  		var tmp = this.readBuffer;
  		this.readBuffer = this.writeBuffer;
  		this.writeBuffer = tmp;
  
  	},
  
  	addPass: function ( pass ) {
  
  		this.passes.push( pass );
  
  		var size = this.renderer.getDrawingBufferSize( new THREE.Vector2() );
  		pass.setSize( size.width, size.height );
  
  	},
  
  	insertPass: function ( pass, index ) {
  
  		this.passes.splice( index, 0, pass );
  
  	},
  
  	render: function ( deltaTime ) {
  
  		// deltaTime value is in seconds
  
  		if ( deltaTime === undefined ) {
  
  			deltaTime = ( Date.now() - this._previousFrameTime ) * 0.001;
  
  		}
  
  		this._previousFrameTime = Date.now();
  
  		var currentRenderTarget = this.renderer.getRenderTarget();
  
  		var maskActive = false;
  
  		var pass, i, il = this.passes.length;
  
  		for ( i = 0; i < il; i ++ ) {
  
  			pass = this.passes[ i ];
  
  			if ( pass.enabled === false ) continue;
  
  			pass.render( this.renderer, this.writeBuffer, this.readBuffer, deltaTime, maskActive );
  
  			if ( pass.needsSwap ) {
  
  				if ( maskActive ) {
  
  					var context = this.renderer.context;
  
  					context.stencilFunc( context.NOTEQUAL, 1, 0xffffffff );
  
  					this.copyPass.render( this.renderer, this.writeBuffer, this.readBuffer, deltaTime );
  
  					context.stencilFunc( context.EQUAL, 1, 0xffffffff );
  
  				}
  
  				this.swapBuffers();
  
  			}
  
  			if ( THREE.MaskPass !== undefined ) {
  
  				if ( pass instanceof THREE.MaskPass ) {
  
  					maskActive = true;
  
  				} else if ( pass instanceof THREE.ClearMaskPass ) {
  
  					maskActive = false;
  
  				}
  
  			}
  
  		}
  
  		this.renderer.setRenderTarget( currentRenderTarget );
  
  	},
  
  	reset: function ( renderTarget ) {
  
  		if ( renderTarget === undefined ) {
  
  			var size = this.renderer.getDrawingBufferSize( new THREE.Vector2() );
  
  			renderTarget = this.renderTarget1.clone();
  			renderTarget.setSize( size.width, size.height );
  
  		}
  
  		this.renderTarget1.dispose();
  		this.renderTarget2.dispose();
  		this.renderTarget1 = renderTarget;
  		this.renderTarget2 = renderTarget.clone();
  
  		this.writeBuffer = this.renderTarget1;
  		this.readBuffer = this.renderTarget2;
  
  	},
  
  	setSize: function ( width, height ) {
  
  		this.renderTarget1.setSize( width, height );
  		this.renderTarget2.setSize( width, height );
  
  		for ( var i = 0; i < this.passes.length; i ++ ) {
  
  			this.passes[ i ].setSize( width, height );
  
  		}
  
  	}
  
  } );
  
  
  THREE.Pass = function () {
  
  	// if set to true, the pass is processed by the composer
  	this.enabled = true;
  
  	// if set to true, the pass indicates to swap read and write buffer after rendering
  	this.needsSwap = true;
  
  	// if set to true, the pass clears its buffer before rendering
  	this.clear = false;
  
  	// if set to true, the result of the pass is rendered to screen
  	this.renderToScreen = false;
  
  };
  
  Object.assign( THREE.Pass.prototype, {
  
  	setSize: function ( width, height ) {},
  
  	render: function ( renderer, writeBuffer, readBuffer, deltaTime, maskActive ) {
  
  		console.error( 'THREE.Pass: .render() must be implemented in derived pass.' );
  
  	}
  
  } );
  