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/**
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 * @author alteredq / http://alteredqualia.com/
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 */
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THREE.RenderPass = function ( scene, camera, overrideMaterial, clearColor, clearAlpha ) {
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	this.scene = scene;
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	this.camera = camera;
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	this.overrideMaterial = overrideMaterial;
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	this.clearColor = clearColor;
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	this.clearAlpha = ( clearAlpha !== undefined ) ? clearAlpha : 1;
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	this.oldClearColor = new THREE.Color();
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	this.oldClearAlpha = 1;
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	this.enabled = true;
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	this.clear = true;
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	this.needsSwap = false;
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	this.prePass = null;
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	this.postPass = null;
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};
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THREE.RenderPass.prototype = {
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	render: function ( renderer, writeBuffer, readBuffer, delta ) {
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		if( this.prePass )
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		{
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			this.prePass.call(this, renderer);
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		}
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		this.scene.overrideMaterial = this.overrideMaterial;
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		if ( this.clearColor ) {
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			this.oldClearColor.copy( renderer.getClearColor() );
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			this.oldClearAlpha = renderer.getClearAlpha();
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			renderer.setClearColor( this.clearColor, this.clearAlpha );
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		}
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		renderer.render( this.scene, this.camera, readBuffer, this.clear );
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		if ( this.clearColor ) {
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			renderer.setClearColor( this.oldClearColor, this.oldClearAlpha );
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		}
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		this.scene.overrideMaterial = null;
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		if( this.postPass )
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		{
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			this.postPass.call(this, renderer);
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		}
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	}
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};
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