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/**
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 * @author alteredq / http://alteredqualia.com/
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 */
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THREE.BloomPass = function ( strength, kernelSize, sigma, resolution ) {
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	strength = ( strength !== undefined ) ? strength : 1;
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	kernelSize = ( kernelSize !== undefined ) ? kernelSize : 25;
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	sigma = ( sigma !== undefined ) ? sigma : 4.0;
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	resolution = ( resolution !== undefined ) ? resolution : 256;
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	// render targets
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	var pars = { minFilter: THREE.LinearFilter, magFilter: THREE.LinearFilter, format: THREE.RGBFormat };
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	this.renderTargetX = new THREE.WebGLRenderTarget( resolution, resolution, pars );
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	this.renderTargetY = new THREE.WebGLRenderTarget( resolution, resolution, pars );
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	// screen material
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	var screenShader = THREE.ShaderExtras[ "screen" ];
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	this.screenUniforms = THREE.UniformsUtils.clone( screenShader.uniforms );
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	this.screenUniforms[ "opacity" ].value = strength;
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	this.materialScreen = new THREE.ShaderMaterial( {
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		uniforms: this.screenUniforms,
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		vertexShader: screenShader.vertexShader,
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		fragmentShader: screenShader.fragmentShader,
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		blending: THREE.AdditiveBlending,
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		transparent: true
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	} );
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	// convolution material
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	var convolutionShader = THREE.ShaderExtras[ "convolution" ];
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	this.convolutionUniforms = THREE.UniformsUtils.clone( convolutionShader.uniforms );
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	this.convolutionUniforms[ "uImageIncrement" ].value = THREE.BloomPass.blurx;
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	this.convolutionUniforms[ "cKernel" ].value = THREE.ShaderExtras.buildKernel( sigma );
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	this.materialConvolution = new THREE.ShaderMaterial( {
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		uniforms: this.convolutionUniforms,
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		vertexShader:   "#define KERNEL_SIZE " + kernelSize + ".0\n" + convolutionShader.vertexShader,
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		fragmentShader: "#define KERNEL_SIZE " + kernelSize + "\n"   + convolutionShader.fragmentShader
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	} );
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	this.enabled = true;
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	this.needsSwap = false;
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	this.clear = false;
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};
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THREE.BloomPass.prototype = {
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	render: function ( renderer, writeBuffer, readBuffer, delta, maskActive ) {
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		if ( maskActive ) renderer.context.disable( renderer.context.STENCIL_TEST );
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		// Render quad with blured scene into texture (convolution pass 1)
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		THREE.EffectComposer.quad.material = this.materialConvolution;
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		this.convolutionUniforms[ "tDiffuse" ].texture = readBuffer;
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		this.convolutionUniforms[ "uImageIncrement" ].value = THREE.BloomPass.blurX;
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		renderer.render( THREE.EffectComposer.scene, THREE.EffectComposer.camera, this.renderTargetX, true );
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		// Render quad with blured scene into texture (convolution pass 2)
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		this.convolutionUniforms[ "tDiffuse" ].texture = this.renderTargetX;
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		this.convolutionUniforms[ "uImageIncrement" ].value = THREE.BloomPass.blurY;
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		renderer.render( THREE.EffectComposer.scene, THREE.EffectComposer.camera, this.renderTargetY, true );
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		// Render original scene with superimposed blur to texture
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		THREE.EffectComposer.quad.material = this.materialScreen;
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		this.screenUniforms[ "tDiffuse" ].texture = this.renderTargetY;
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		if ( maskActive ) renderer.context.enable( renderer.context.STENCIL_TEST );
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		renderer.render( THREE.EffectComposer.scene, THREE.EffectComposer.camera, readBuffer, this.clear );
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	}
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};
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THREE.BloomPass.blurX = new THREE.Vector2( 0.001953125, 0.0 );
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THREE.BloomPass.blurY = new THREE.Vector2( 0.0, 0.001953125 );
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