/**
 * @author Mat Groves http://matgroves.com/ @Doormat23
 */

/**
 * 
 * This inverts your displayObjects colors.
 * @class InvertFilter
 * @contructor
 */
PIXI.InvertFilter = function()
{
	PIXI.AbstractFilter.call( this );
	
	this.passes = [this];
	
	// set the uniforms
	this.uniforms = {
		invert: {type: 'f', value: 1},
	};
	
	this.fragmentSrc = [
	  "precision mediump float;",
	  "varying vec2 vTextureCoord;",
	  "varying float vColor;",
	  "uniform float invert;",
	  "uniform sampler2D uSampler;",
	  "void main(void) {",
	    "gl_FragColor = texture2D(uSampler, vTextureCoord);",
		"gl_FragColor.rgb = mix( (vec3(1)-gl_FragColor.rgb) * gl_FragColor.a, gl_FragColor.rgb, 1.0 - invert);",
		//"gl_FragColor.rgb = gl_FragColor.rgb  * gl_FragColor.a;",
	    "gl_FragColor = gl_FragColor * vColor;",
	  "}"
	];
	
}

PIXI.InvertFilter.prototype = Object.create( PIXI.AbstractFilter.prototype );
PIXI.InvertFilter.prototype.constructor = PIXI.InvertFilter;

/**
The strength of the invert. 1 will fully invert the colors, 0 will make the object its normal color
@property invert
*/
Object.defineProperty(PIXI.InvertFilter.prototype, 'invert', {
    get: function() {
        return this.uniforms.invert.value;
    },
    set: function(value) {
    	this.uniforms.invert.value = value;
    }
});