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/**
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 * @author alteredq / http://alteredqualia.com/
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 */
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THREE.MaskPass = function ( scene, camera ) {
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	this.scene = scene;
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	this.camera = camera;
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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.inverse = false;
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};
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THREE.MaskPass.prototype = {
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	render: function ( renderer, writeBuffer, readBuffer, delta ) {
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		var context = renderer.context;
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		// don't update color or depth
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		context.colorMask( false, false, false, false );
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		context.depthMask( false );
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		// set up stencil
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		var writeValue, clearValue;
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		if ( this.inverse ) {
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			writeValue = 0;
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			clearValue = 1;
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		} else {
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			writeValue = 1;
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			clearValue = 0;
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		}
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		context.enable( context.STENCIL_TEST );
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		context.stencilOp( context.REPLACE, context.REPLACE, context.REPLACE );
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		context.stencilFunc( context.ALWAYS, writeValue, 0xffffffff );
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		context.clearStencil( clearValue );
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		// draw into the stencil buffer
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		renderer.render( this.scene, this.camera, readBuffer, this.clear );
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		renderer.render( this.scene, this.camera, writeBuffer, this.clear );
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		// re-enable update of color and depth
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		context.colorMask( true, true, true, true );
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		context.depthMask( true );
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		// only render where stencil is set to 1
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		context.stencilFunc( context.EQUAL, 1, 0xffffffff );  // draw if == 1
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		context.stencilOp( context.KEEP, context.KEEP, context.KEEP );
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	}
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};
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THREE.ClearMaskPass = function () {
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	this.enabled = true;
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};
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THREE.ClearMaskPass.prototype = {
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	render: function ( renderer, writeBuffer, readBuffer, delta ) {
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		var context = renderer.context;
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		context.disable( context.STENCIL_TEST );
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	}
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};
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