phaser/build/custom/pixi.js

/**
* @author       Richard Davey <rich@photonstorm.com>
* @copyright    2015 Photon Storm Ltd.
* @license      {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
*
* @overview
*
* Phaser - http://phaser.io
*
* v2.4.6 "Baerlon" - Built: Thu Feb 18 2016 14:40:25
*
* By Richard Davey http://www.photonstorm.com @photonstorm
*
* Phaser is a fun, free and fast 2D game framework for making HTML5 games
* for desktop and mobile web browsers, supporting Canvas and WebGL rendering.
*
* Phaser uses Pixi.js for rendering, created by Mat Groves http://matgroves.com @Doormat23
* Phaser uses p2.js for full-body physics, created by Stefan Hedman https://github.com/schteppe/p2.js @schteppe
* Phaser contains a port of N+ Physics, converted by Richard Davey, original by http://www.metanetsoftware.com
*
* Many thanks to Adam Saltsman (@ADAMATOMIC) for releasing Flixel, from which both Phaser
* and my love of framework development originate.
*
* Follow development at http://phaser.io and on our forum
*
* "If you want your children to be intelligent,  read them fairy tales."
* "If you want them to be more intelligent, read them more fairy tales."
*                                                     -- Albert Einstein
*/

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

(function(){

    var root = this;

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

/**
 * The [pixi.js](http://www.pixijs.com/) module/namespace.
 *
 * @module PIXI
 */
 
/**
 * Namespace-class for [pixi.js](http://www.pixijs.com/).
 *
 * Contains assorted static properties and enumerations.
 *
 * @class PIXI
 * @static
 */
var PIXI = PIXI || {};

/**
 * A reference to the Phaser Game instance that owns this Pixi renderer.
 * @property {Phaser.Game} game
 * @static 
 */
PIXI.game = null;

/**
 * @property {Number} WEBGL_RENDERER
 * @protected
 * @static 
 */
PIXI.WEBGL_RENDERER = 0;

/**
 * @property {Number} CANVAS_RENDERER
 * @protected
 * @static
 */
PIXI.CANVAS_RENDERER = 1;

/**
 * Version of pixi that is loaded.
 * @property {String} VERSION
 * @static 
 */
PIXI.VERSION = "v2.2.9";

// used to create uids for various pixi objects.
PIXI._UID = 0;

if (typeof(Float32Array) != 'undefined')
{
    PIXI.Float32Array = Float32Array;
    PIXI.Uint16Array = Uint16Array;

    // Uint32Array and ArrayBuffer only used by WebGL renderer
    // We can suppose that if WebGL is supported then typed arrays are supported too
    // as they predate WebGL support for all browsers:
    // see typed arrays support: http://caniuse.com/#search=TypedArrays
    // see WebGL support: http://caniuse.com/#search=WebGL
    PIXI.Uint32Array = Uint32Array;
    PIXI.ArrayBuffer = ArrayBuffer;
}
else
{
    PIXI.Float32Array = Array;
    PIXI.Uint16Array = Array;
}

/**
 * @property {Number} PI_2
 * @static
 */
PIXI.PI_2 = Math.PI * 2;

/**
 * @property {Number} RAD_TO_DEG
 * @static
 */
PIXI.RAD_TO_DEG = 180 / Math.PI;

/**
 * @property {Number} DEG_TO_RAD
 * @static
 */
PIXI.DEG_TO_RAD = Math.PI / 180;

/**
 * @property {String} RETINA_PREFIX
 * @protected
 * @static
 */
PIXI.RETINA_PREFIX = "@2x";

/**
 * The default render options if none are supplied to
 * {{#crossLink "WebGLRenderer"}}{{/crossLink}} or {{#crossLink "CanvasRenderer"}}{{/crossLink}}.
 *
 * @property {Object} defaultRenderOptions
 * @property {Object} defaultRenderOptions.view=null
 * @property {Boolean} defaultRenderOptions.transparent=false
 * @property {Boolean} defaultRenderOptions.antialias=false
 * @property {Boolean} defaultRenderOptions.preserveDrawingBuffer=false
 * @property {Number} defaultRenderOptions.resolution=1
 * @property {Boolean} defaultRenderOptions.clearBeforeRender=true
 * @property {Boolean} defaultRenderOptions.autoResize=false
 * @static
PIXI.defaultRenderOptions = {
    view: null,
    transparent: false,
    antialias: false, 
    preserveDrawingBuffer: false,
    resolution: 1,
    clearBeforeRender: true,
    autoResize: false
};
 */

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

/**
 * The base class for all objects that are rendered on the screen.
 * This is an abstract class and should not be used on its own rather it should be extended.
 *
 * @class DisplayObject
 * @constructor
 */
PIXI.DisplayObject = function()
{
    /**
     * The coordinate of the object relative to the local coordinates of the parent.
     *
     * @property position
     * @type Point
     */
    this.position = new PIXI.Point(0, 0);

    /**
     * The scale factor of the object.
     *
     * @property scale
     * @type Point
     */
    this.scale = new PIXI.Point(1, 1);

    /**
     * The pivot point of the displayObject that it rotates around
     *
     * @property pivot
     * @type Point
     */
    this.pivot = new PIXI.Point(0, 0);

    /**
     * The rotation of the object in radians.
     *
     * @property rotation
     * @type Number
     */
    this.rotation = 0;

    /**
     * The opacity of the object.
     *
     * @property alpha
     * @type Number
     */
    this.alpha = 1;

    /**
     * The visibility of the object.
     *
     * @property visible
     * @type Boolean
     */
    this.visible = true;

    /**
     * This is the defined area that will pick up mouse / touch events. It is null by default.
     * Setting it is a neat way of optimising the hitTest function that the interactionManager will use (as it will not need to hit test all the children)
     *
     * @property hitArea
     * @type Rectangle|Circle|Ellipse|Polygon
     */
    this.hitArea = null;

    /**
     * Can this object be rendered
     *
     * @property renderable
     * @type Boolean
     */
    this.renderable = false;

    /**
     * [read-only] The display object container that contains this display object.
     *
     * @property parent
     * @type DisplayObjectContainer
     * @readOnly
     */
    this.parent = null;

    /**
     * [read-only] The stage the display object is connected to, or undefined if it is not connected to the stage.
     *
     * @property stage
     * @type Stage
     * @readOnly
     */
    this.stage = null;

    /**
     * [read-only] The multiplied alpha of the displayObject
     *
     * @property worldAlpha
     * @type Number
     * @readOnly
     */
    this.worldAlpha = 1;

    /**
     * [read-only] Current transform of the object based on world (parent) factors
     *
     * @property worldTransform
     * @type Matrix
     * @readOnly
     * @private
     */
    this.worldTransform = new PIXI.Matrix();

    /**
     * The position of the Display Object based on the world transform.
     * This value is updated at the end of updateTransform and takes all parent transforms into account.
     *
     * @property worldPosition
     * @type Point
     * @readOnly
     */
    this.worldPosition = new PIXI.Point(0, 0);

    /**
     * The scale of the Display Object based on the world transform.
     * This value is updated at the end of updateTransform and takes all parent transforms into account.
     *
     * @property worldScale
     * @type Point
     * @readOnly
     */
    this.worldScale = new PIXI.Point(1, 1);

    /**
     * The rotation of the Display Object, in radians, based on the world transform.
     * This value is updated at the end of updateTransform and takes all parent transforms into account.
     *
     * @property worldRotation
     * @type Number
     * @readOnly
     */
    this.worldRotation = 0;

    /**
     * cached sin rotation and cos rotation
     *
     * @property _sr
     * @type Number
     * @private
     */
    this._sr = 0;

    /**
     * cached sin rotation and cos rotation
     *
     * @property _cr
     * @type Number
     * @private
     */
    this._cr = 1;

    /**
     * The area the filter is applied to like the hitArea this is used as more of an optimisation
     * rather than figuring out the dimensions of the displayObject each frame you can set this rectangle
     *
     * @property filterArea
     * @type Rectangle
     */
    this.filterArea = null;

    /**
     * The original, cached bounds of the object
     *
     * @property _bounds
     * @type Rectangle
     * @private
     */
    this._bounds = new PIXI.Rectangle(0, 0, 1, 1);

    /**
     * The most up-to-date bounds of the object
     *
     * @property _currentBounds
     * @type Rectangle
     * @private
     */
    this._currentBounds = null;

    /**
     * The original, cached mask of the object
     *
     * @property _mask
     * @type Rectangle
     * @private
     */
    this._mask = null;

    /**
     * Cached internal flag.
     *
     * @property _cacheAsBitmap
     * @type Boolean
     * @private
     */
    this._cacheAsBitmap = false;

    /**
     * Cached internal flag.
     *
     * @property _cacheIsDirty
     * @type Boolean
     * @private
     */
    this._cacheIsDirty = false;

};

// constructor
PIXI.DisplayObject.prototype.constructor = PIXI.DisplayObject;

/**
 * Destroy this DisplayObject.
 * Removes all references to transformCallbacks, its parent, the stage, filters, bounds, mask and cached Sprites.
 *
 * @method destroy
 */
PIXI.DisplayObject.prototype.destroy = function()
{
    if (this.children)
    {
        var i = this.children.length;

        while (i--)
        {
            this.children[i].destroy();
        }

        this.children = [];
    }

    this.hitArea = null;
    this.parent = null;
    this.stage = null;
    this.worldTransform = null;
    this.filterArea = null;
    this._bounds = null;
    this._currentBounds = null;
    this._mask = null;

    //  In case Pixi is still going to try and render it even though destroyed
    this.renderable = false;

    this._destroyCachedSprite();
};

/**
 * [read-only] Indicates if the sprite is globally visible.
 *
 * @property worldVisible
 * @type Boolean
 */
Object.defineProperty(PIXI.DisplayObject.prototype, 'worldVisible', {

    get: function() {

        var item = this;

        do
        {
            if (!item.visible) return false;
            item = item.parent;
        }
        while(item);

        return true;
    }

});

/**
 * Sets a mask for the displayObject. A mask is an object that limits the visibility of an object to the shape of the mask applied to it.
 * In PIXI a regular mask must be a PIXI.Graphics object. This allows for much faster masking in canvas as it utilises shape clipping.
 * To remove a mask, set this property to null.
 *
 * @property mask
 * @type Graphics
 */
Object.defineProperty(PIXI.DisplayObject.prototype, 'mask', {

    get: function() {
        return this._mask;
    },

    set: function(value) {

        if (this._mask) this._mask.isMask = false;

        this._mask = value;

        if (this._mask) this._mask.isMask = true;
    }

});

/**
 * Sets the filters for the displayObject.
 * IMPORTANT: This is a webGL only feature and will be ignored by the Canvas renderer.
 * 
 * To remove filters simply set this property to 'null'.
 * 
 * You cannot have a filter and a multiply blend mode active at the same time. Setting a filter will reset
 * this objects blend mode to NORMAL.
 * 
 * @property filters
 * @type Array(Filter)
 */
Object.defineProperty(PIXI.DisplayObject.prototype, 'filters', {

    get: function() {
        return this._filters;
    },

    set: function(value) {

        if (value)
        {
            // now put all the passes in one place..
            var passes = [];

            for (var i = 0; i < value.length; i++)
            {
                var filterPasses = value[i].passes;

                for (var j = 0; j < filterPasses.length; j++)
                {
                    passes.push(filterPasses[j]);
                }
            }

            // TODO change this as it is legacy
            this._filterBlock = { target: this, filterPasses: passes };
        }

        this._filters = value;

        if (this.blendMode && this.blendMode === PIXI.blendModes.MULTIPLY)
        {
            this.blendMode = PIXI.blendModes.NORMAL;
        }
    }
});

/**
 * Set if this display object is cached as a bitmap.
 * This basically takes a snap shot of the display object as it is at that moment. It can provide a performance benefit for complex static displayObjects.
 * To remove simply set this property to 'null'
 * @property cacheAsBitmap
 * @type Boolean
 */
Object.defineProperty(PIXI.DisplayObject.prototype, 'cacheAsBitmap', {

    get: function() {
        return  this._cacheAsBitmap;
    },

    set: function(value) {

        if (this._cacheAsBitmap === value)
        {
            return;
        }

        if (value)
        {
            this._generateCachedSprite();
        }
        else
        {
            this._destroyCachedSprite();
        }

        this._cacheAsBitmap = value;
    }

});

/*
 * Updates the object transform for rendering.
 *
 * If the object has no parent, and no parent parameter is provided, it will default to Phaser.Game.World as the parent.
 * If that is unavailable the transform fails to take place.
 *
 * The `parent` parameter has priority over the actual parent. Use it as a parent override.
 * Setting it does **not** change the actual parent of this DisplayObject, it just uses the parent for the transform update.
 *
 * @method updateTransform
 * @param {DisplayObject} [parent] - Optional parent to parent this DisplayObject transform from.
 */
PIXI.DisplayObject.prototype.updateTransform = function(parent)
{
    if (!parent && !this.parent && !this.game)
    {
        return;
    }

    var p = this.parent;

    if (parent)
    {
        p = parent;
    }
    else if (!this.parent)
    {
        p = this.game.world;
    }

    // create some matrix refs for easy access
    var pt = p.worldTransform;
    var wt = this.worldTransform;

    // temporary matrix variables
    var a, b, c, d, tx, ty;

    // so if rotation is between 0 then we can simplify the multiplication process..
    if (this.rotation % PIXI.PI_2)
    {
        // check to see if the rotation is the same as the previous render. This means we only need to use sin and cos when rotation actually changes
        if (this.rotation !== this.rotationCache)
        {
            this.rotationCache = this.rotation;
            this._sr = Math.sin(this.rotation);
            this._cr = Math.cos(this.rotation);
        }

        // get the matrix values of the displayobject based on its transform properties..
        a  =  this._cr * this.scale.x;
        b  =  this._sr * this.scale.x;
        c  = -this._sr * this.scale.y;
        d  =  this._cr * this.scale.y;
        tx =  this.position.x;
        ty =  this.position.y;
        
        // check for pivot.. not often used so geared towards that fact!
        if (this.pivot.x || this.pivot.y)
        {
            tx -= this.pivot.x * a + this.pivot.y * c;
            ty -= this.pivot.x * b + this.pivot.y * d;
        }

        // concat the parent matrix with the objects transform.
        wt.a  = a  * pt.a + b  * pt.c;
        wt.b  = a  * pt.b + b  * pt.d;
        wt.c  = c  * pt.a + d  * pt.c;
        wt.d  = c  * pt.b + d  * pt.d;
        wt.tx = tx * pt.a + ty * pt.c + pt.tx;
        wt.ty = tx * pt.b + ty * pt.d + pt.ty;
    }
    else
    {
        // lets do the fast version as we know there is no rotation..
        a  = this.scale.x;
        d  = this.scale.y;

        tx = this.position.x - this.pivot.x * a;
        ty = this.position.y - this.pivot.y * d;

        wt.a  = a  * pt.a;
        wt.b  = a  * pt.b;
        wt.c  = d  * pt.c;
        wt.d  = d  * pt.d;
        wt.tx = tx * pt.a + ty * pt.c + pt.tx;
        wt.ty = tx * pt.b + ty * pt.d + pt.ty;
    }

    // multiply the alphas..
    this.worldAlpha = this.alpha * p.worldAlpha;

    this.worldPosition.set(wt.tx, wt.ty);
    this.worldScale.set(Math.sqrt(wt.a * wt.a + wt.b * wt.b), Math.sqrt(wt.c * wt.c + wt.d * wt.d));
    this.worldRotation = Math.atan2(-wt.c, wt.d);

    // reset the bounds each time this is called!
    this._currentBounds = null;

    //  Custom callback?
    if (this.transformCallback)
    {
        this.transformCallback.call(this.transformCallbackContext, wt, pt);
    }

};

// performance increase to avoid using call.. (10x faster)
PIXI.DisplayObject.prototype.displayObjectUpdateTransform = PIXI.DisplayObject.prototype.updateTransform;

/**
 * Retrieves the bounds of the displayObject as a rectangle object
 *
 * @method getBounds
 * @param matrix {Matrix}
 * @return {Rectangle} the rectangular bounding area
 */
PIXI.DisplayObject.prototype.getBounds = function(matrix)
{
    matrix = matrix;//just to get passed js hinting (and preserve inheritance)
    return PIXI.EmptyRectangle;
};

/**
 * Retrieves the local bounds of the displayObject as a rectangle object
 *
 * @method getLocalBounds
 * @return {Rectangle} the rectangular bounding area
 */
PIXI.DisplayObject.prototype.getLocalBounds = function()
{
    return this.getBounds(PIXI.identityMatrix);///PIXI.EmptyRectangle();
};

/**
 * Sets the object's stage reference, the stage this object is connected to
 *
 * @method setStageReference
 * @param stage {Stage} the stage that the object will have as its current stage reference
 */
PIXI.DisplayObject.prototype.setStageReference = function(stage)
{
    this.stage = stage;
};

/**
 * Empty, to be overridden by classes that require it.
 *
 * @method preUpdate
 */
PIXI.DisplayObject.prototype.preUpdate = function()
{
};

/**
 * Useful function that returns a texture of the displayObject object that can then be used to create sprites
 * This can be quite useful if your displayObject is static / complicated and needs to be reused multiple times.
 *
 * @method generateTexture
 * @param resolution {Number} The resolution of the texture being generated
 * @param scaleMode {Number} See {{#crossLink "PIXI/scaleModes:property"}}PIXI.scaleModes{{/crossLink}} for possible values
 * @param renderer {CanvasRenderer|WebGLRenderer} The renderer used to generate the texture.
 * @return {Texture} a texture of the graphics object
 */
PIXI.DisplayObject.prototype.generateTexture = function(resolution, scaleMode, renderer)
{
    var bounds = this.getLocalBounds();

    var renderTexture = new PIXI.RenderTexture(bounds.width | 0, bounds.height | 0, renderer, scaleMode, resolution);
    
    PIXI.DisplayObject._tempMatrix.tx = -bounds.x;
    PIXI.DisplayObject._tempMatrix.ty = -bounds.y;
    
    renderTexture.render(this, PIXI.DisplayObject._tempMatrix);

    return renderTexture;
};

/**
 * Generates and updates the cached sprite for this object.
 *
 * @method updateCache
 */
PIXI.DisplayObject.prototype.updateCache = function()
{
    this._generateCachedSprite();
};

/**
 * Calculates the global position of the display object
 *
 * @method toGlobal
 * @param position {Point} The world origin to calculate from
 * @return {Point} A point object representing the position of this object
 */
PIXI.DisplayObject.prototype.toGlobal = function(position)
{
    // don't need to u[date the lot
    this.displayObjectUpdateTransform();
    return this.worldTransform.apply(position);
};

/**
 * Calculates the local position of the display object relative to another point
 *
 * @method toLocal
 * @param position {Point} The world origin to calculate from
 * @param [from] {DisplayObject} The DisplayObject to calculate the global position from
 * @return {Point} A point object representing the position of this object
 */
PIXI.DisplayObject.prototype.toLocal = function(position, from)
{
    if (from)
    {
        position = from.toGlobal(position);
    }

    // don't need to u[date the lot
    this.displayObjectUpdateTransform();

    return this.worldTransform.applyInverse(position);
};

/**
 * Internal method.
 *
 * @method _renderCachedSprite
 * @param renderSession {Object} The render session
 * @private
 */
PIXI.DisplayObject.prototype._renderCachedSprite = function(renderSession)
{
    this._cachedSprite.worldAlpha = this.worldAlpha;

    if (renderSession.gl)
    {
        PIXI.Sprite.prototype._renderWebGL.call(this._cachedSprite, renderSession);
    }
    else
    {
        PIXI.Sprite.prototype._renderCanvas.call(this._cachedSprite, renderSession);
    }
};

/**
 * Internal method.
 *
 * @method _generateCachedSprite
 * @private
 */
PIXI.DisplayObject.prototype._generateCachedSprite = function()
{
    this._cacheAsBitmap = false;

    var bounds = this.getLocalBounds();

    //  Round it off and force non-zero dimensions
    bounds.width = Math.max(1, Math.ceil(bounds.width));
    bounds.height = Math.max(1, Math.ceil(bounds.height));

    this.updateTransform();

    if (!this._cachedSprite)
    {
        var renderTexture = new PIXI.RenderTexture(bounds.width, bounds.height);
        this._cachedSprite = new PIXI.Sprite(renderTexture);
        this._cachedSprite.worldTransform = this.worldTransform;
    }
    else
    {
        this._cachedSprite.texture.resize(bounds.width, bounds.height);
    }

    //  Remove filters
    var tempFilters = this._filters;
    this._filters = null;
    this._cachedSprite.filters = tempFilters;

    // PIXI.DisplayObject._tempMatrix.identity();
    PIXI.DisplayObject._tempMatrix.tx = -bounds.x;
    PIXI.DisplayObject._tempMatrix.ty = -bounds.y;

    this._cachedSprite.texture.render(this, PIXI.DisplayObject._tempMatrix, true);
    this._cachedSprite.anchor.x = -(bounds.x / bounds.width);
    this._cachedSprite.anchor.y = -(bounds.y / bounds.height);

    this._filters = tempFilters;

    this._cacheAsBitmap = true;
};

/**
* Destroys the cached sprite.
*
* @method _destroyCachedSprite
* @private
*/
PIXI.DisplayObject.prototype._destroyCachedSprite = function()
{
    if (!this._cachedSprite) return;

    this._cachedSprite.texture.destroy(true);

    // TODO could be object pooled!
    this._cachedSprite = null;
};

/**
* Renders the object using the WebGL renderer
*
* @method _renderWebGL
* @param renderSession {RenderSession}
* @private
*/
PIXI.DisplayObject.prototype._renderWebGL = function(renderSession)
{
    // OVERWRITE;
    // this line is just here to pass jshinting :)
    renderSession = renderSession;
};

/**
* Renders the object using the Canvas renderer
*
* @method _renderCanvas
* @param renderSession {RenderSession}
* @private
*/
PIXI.DisplayObject.prototype._renderCanvas = function(renderSession)
{
    // OVERWRITE;
    // this line is just here to pass jshinting :)
    renderSession = renderSession;
};

/**
 * The position of the displayObject on the x axis relative to the local coordinates of the parent.
 *
 * @property x
 * @type Number
 */
Object.defineProperty(PIXI.DisplayObject.prototype, 'x', {

    get: function() {
        return  this.position.x;
    },

    set: function(value) {
        this.position.x = value;
    }

});

/**
 * The position of the displayObject on the y axis relative to the local coordinates of the parent.
 *
 * @property y
 * @type Number
 */
Object.defineProperty(PIXI.DisplayObject.prototype, 'y', {

    get: function() {
        return  this.position.y;
    },

    set: function(value) {
        this.position.y = value;
    }

});

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

/**
 * A DisplayObjectContainer represents a collection of display objects.
 * It is the base class of all display objects that act as a container for other objects.
 *
 * @class DisplayObjectContainer
 * @extends DisplayObject
 * @constructor
 */
PIXI.DisplayObjectContainer = function()
{
    PIXI.DisplayObject.call(this);

    /**
     * [read-only] The array of children of this container.
     *
     * @property children
     * @type Array(DisplayObject)
     * @readOnly
     */
    this.children = [];
    
};

// constructor
PIXI.DisplayObjectContainer.prototype = Object.create( PIXI.DisplayObject.prototype );
PIXI.DisplayObjectContainer.prototype.constructor = PIXI.DisplayObjectContainer;

/**
 * The width of the displayObjectContainer, setting this will actually modify the scale to achieve the value set
 *
 * @property width
 * @type Number
 */
Object.defineProperty(PIXI.DisplayObjectContainer.prototype, 'width', {

    get: function() {
        return this.scale.x * this.getLocalBounds().width;
    },

    set: function(value) {
        
        var width = this.getLocalBounds().width;

        if (width !== 0)
        {
            this.scale.x = value / width;
        }
        else
        {
            this.scale.x = 1;
        }
        
        this._width = value;
    }
});

/**
 * The height of the displayObjectContainer, setting this will actually modify the scale to achieve the value set
 *
 * @property height
 * @type Number
 */
Object.defineProperty(PIXI.DisplayObjectContainer.prototype, 'height', {

    get: function() {
        return  this.scale.y * this.getLocalBounds().height;
    },

    set: function(value) {

        var height = this.getLocalBounds().height;

        if (height !== 0)
        {
            this.scale.y = value / height;
        }
        else
        {
            this.scale.y = 1;
        }

        this._height = value;
    }

});

/**
 * Adds a child to the container.
 *
 * @method addChild
 * @param child {DisplayObject} The DisplayObject to add to the container
 * @return {DisplayObject} The child that was added.
 */
PIXI.DisplayObjectContainer.prototype.addChild = function(child)
{
    return this.addChildAt(child, this.children.length);
};

/**
 * Adds a child to the container at a specified index. If the index is out of bounds an error will be thrown
 *
 * @method addChildAt
 * @param child {DisplayObject} The child to add
 * @param index {Number} The index to place the child in
 * @return {DisplayObject} The child that was added.
 */
PIXI.DisplayObjectContainer.prototype.addChildAt = function(child, index)
{
    if(index >= 0 && index <= this.children.length)
    {
        if(child.parent)
        {
            child.parent.removeChild(child);
        }

        child.parent = this;

        this.children.splice(index, 0, child);

        if(this.stage)child.setStageReference(this.stage);

        return child;
    }
    else
    {
        throw new Error(child + 'addChildAt: The index '+ index +' supplied is out of bounds ' + this.children.length);
    }
};

/**
 * Swaps the position of 2 Display Objects within this container.
 *
 * @method swapChildren
 * @param child {DisplayObject}
 * @param child2 {DisplayObject}
 */
PIXI.DisplayObjectContainer.prototype.swapChildren = function(child, child2)
{
    if(child === child2) {
        return;
    }

    var index1 = this.getChildIndex(child);
    var index2 = this.getChildIndex(child2);

    if(index1 < 0 || index2 < 0) {
        throw new Error('swapChildren: Both the supplied DisplayObjects must be a child of the caller.');
    }

    this.children[index1] = child2;
    this.children[index2] = child;

};

/**
 * Returns the index position of a child DisplayObject instance
 *
 * @method getChildIndex
 * @param child {DisplayObject} The DisplayObject instance to identify
 * @return {Number} The index position of the child display object to identify
 */
PIXI.DisplayObjectContainer.prototype.getChildIndex = function(child)
{
    var index = this.children.indexOf(child);
    if (index === -1)
    {
        throw new Error('The supplied DisplayObject must be a child of the caller');
    }
    return index;
};

/**
 * Changes the position of an existing child in the display object container
 *
 * @method setChildIndex
 * @param child {DisplayObject} The child DisplayObject instance for which you want to change the index number
 * @param index {Number} The resulting index number for the child display object
 */
PIXI.DisplayObjectContainer.prototype.setChildIndex = function(child, index)
{
    if (index < 0 || index >= this.children.length)
    {
        throw new Error('The supplied index is out of bounds');
    }
    var currentIndex = this.getChildIndex(child);
    this.children.splice(currentIndex, 1); //remove from old position
    this.children.splice(index, 0, child); //add at new position
};

/**
 * Returns the child at the specified index
 *
 * @method getChildAt
 * @param index {Number} The index to get the child from
 * @return {DisplayObject} The child at the given index, if any.
 */
PIXI.DisplayObjectContainer.prototype.getChildAt = function(index)
{
    if (index < 0 || index >= this.children.length)
    {
        throw new Error('getChildAt: Supplied index '+ index +' does not exist in the child list, or the supplied DisplayObject must be a child of the caller');
    }
    return this.children[index];
    
};

/**
 * Removes a child from the container.
 *
 * @method removeChild
 * @param child {DisplayObject} The DisplayObject to remove
 * @return {DisplayObject} The child that was removed.
 */
PIXI.DisplayObjectContainer.prototype.removeChild = function(child)
{
    var index = this.children.indexOf( child );
    if(index === -1)return;
    
    return this.removeChildAt( index );
};

/**
 * Removes a child from the specified index position.
 *
 * @method removeChildAt
 * @param index {Number} The index to get the child from
 * @return {DisplayObject} The child that was removed.
 */
PIXI.DisplayObjectContainer.prototype.removeChildAt = function(index)
{
    var child = this.getChildAt( index );
    if(this.stage)
        child.removeStageReference();

    child.parent = undefined;
    this.children.splice( index, 1 );
    return child;
};

/**
* Removes all children from this container that are within the begin and end indexes.
*
* @method removeChildren
* @param beginIndex {Number} The beginning position. Default value is 0.
* @param endIndex {Number} The ending position. Default value is size of the container.
*/
PIXI.DisplayObjectContainer.prototype.removeChildren = function(beginIndex, endIndex)
{
    var begin = beginIndex || 0;
    var end = typeof endIndex === 'number' ? endIndex : this.children.length;
    var range = end - begin;

    if (range > 0 && range <= end)
    {
        var removed = this.children.splice(begin, range);
        for (var i = 0; i < removed.length; i++) {
            var child = removed[i];
            if(this.stage)
                child.removeStageReference();
            child.parent = undefined;
        }
        return removed;
    }
    else if (range === 0 && this.children.length === 0)
    {
        return [];
    }
    else
    {
        throw new Error( 'removeChildren: Range Error, numeric values are outside the acceptable range' );
    }
};

/*
 * Updates the transform on all children of this container for rendering
 *
 * @method updateTransform
 * @private
 */
PIXI.DisplayObjectContainer.prototype.updateTransform = function()
{
    if (!this.visible)
    {
        return;
    }

    this.displayObjectUpdateTransform();

    if (this._cacheAsBitmap)
    {
        return;
    }

    for (var i = 0; i < this.children.length; i++)
    {
        this.children[i].updateTransform();
    }
};

// performance increase to avoid using call.. (10x faster)
PIXI.DisplayObjectContainer.prototype.displayObjectContainerUpdateTransform = PIXI.DisplayObjectContainer.prototype.updateTransform;

/**
 * Retrieves the bounds of the displayObjectContainer as a rectangle. The bounds calculation takes all visible children into consideration.
 *
 * @method getBounds
 * @return {Rectangle} The rectangular bounding area
 */
PIXI.DisplayObjectContainer.prototype.getBounds = function()
{
    if(this.children.length === 0)return PIXI.EmptyRectangle;

    // TODO the bounds have already been calculated this render session so return what we have

    var minX = Infinity;
    var minY = Infinity;

    var maxX = -Infinity;
    var maxY = -Infinity;

    var childBounds;
    var childMaxX;
    var childMaxY;

    var childVisible = false;

    for(var i=0,j=this.children.length; i<j; i++)
    {
        var child = this.children[i];
        
        if(!child.visible)continue;

        childVisible = true;

        childBounds = this.children[i].getBounds();
     
        minX = minX < childBounds.x ? minX : childBounds.x;
        minY = minY < childBounds.y ? minY : childBounds.y;

        childMaxX = childBounds.width + childBounds.x;
        childMaxY = childBounds.height + childBounds.y;

        maxX = maxX > childMaxX ? maxX : childMaxX;
        maxY = maxY > childMaxY ? maxY : childMaxY;
    }

    if(!childVisible)
        return PIXI.EmptyRectangle;

    var bounds = this._bounds;

    bounds.x = minX;
    bounds.y = minY;
    bounds.width = maxX - minX;
    bounds.height = maxY - minY;

    // TODO: store a reference so that if this function gets called again in the render cycle we do not have to recalculate
    //this._currentBounds = bounds;
   
    return bounds;
};

/**
 * Retrieves the non-global local bounds of the displayObjectContainer as a rectangle. The calculation takes all visible children into consideration.
 *
 * @method getLocalBounds
 * @return {Rectangle} The rectangular bounding area
 */
PIXI.DisplayObjectContainer.prototype.getLocalBounds = function()
{
    var matrixCache = this.worldTransform;

    this.worldTransform = PIXI.identityMatrix;

    for(var i=0,j=this.children.length; i<j; i++)
    {
        this.children[i].updateTransform();
    }

    var bounds = this.getBounds();

    this.worldTransform = matrixCache;

    return bounds;
};

/**
 * Sets the containers Stage reference. This is the Stage that this object, and all of its children, is connected to.
 *
 * @method setStageReference
 * @param stage {Stage} the stage that the container will have as its current stage reference
 */
PIXI.DisplayObjectContainer.prototype.setStageReference = function(stage)
{
    this.stage = stage;
    
    for (var i=0; i < this.children.length; i++)
    {
        this.children[i].setStageReference(stage)
    }
};

/**
 * Removes the current stage reference from the container and all of its children.
 *
 * @method removeStageReference
 */
PIXI.DisplayObjectContainer.prototype.removeStageReference = function()
{
    for (var i = 0; i < this.children.length; i++)
    {
        this.children[i].removeStageReference();
    }

    this.stage = null;
};

/**
* Renders the object using the WebGL renderer
*
* @method _renderWebGL
* @param renderSession {RenderSession} 
* @private
*/
PIXI.DisplayObjectContainer.prototype._renderWebGL = function(renderSession)
{
    if (!this.visible || this.alpha <= 0) return;
    
    if (this._cacheAsBitmap)
    {
        this._renderCachedSprite(renderSession);
        return;
    }
    
    var i;

    if (this._mask || this._filters)
    {
        // push filter first as we need to ensure the stencil buffer is correct for any masking
        if (this._filters)
        {
            renderSession.spriteBatch.flush();
            renderSession.filterManager.pushFilter(this._filterBlock);
        }

        if (this._mask)
        {
            renderSession.spriteBatch.stop();
            renderSession.maskManager.pushMask(this.mask, renderSession);
            renderSession.spriteBatch.start();
        }

        // simple render children!
        for (i = 0; i < this.children.length; i++)
        {
            this.children[i]._renderWebGL(renderSession);
        }

        renderSession.spriteBatch.stop();

        if (this._mask) renderSession.maskManager.popMask(this._mask, renderSession);
        if (this._filters) renderSession.filterManager.popFilter();
        
        renderSession.spriteBatch.start();
    }
    else
    {
        // simple render children!
        for (i = 0; i < this.children.length; i++)
        {
            this.children[i]._renderWebGL(renderSession);
        }
    }
};

/**
* Renders the object using the Canvas renderer
*
* @method _renderCanvas
* @param renderSession {RenderSession} 
* @private
*/
PIXI.DisplayObjectContainer.prototype._renderCanvas = function(renderSession)
{
    if (this.visible === false || this.alpha === 0) return;

    if (this._cacheAsBitmap)
    {
        this._renderCachedSprite(renderSession);
        return;
    }

    if (this._mask)
    {
        renderSession.maskManager.pushMask(this._mask, renderSession);
    }

    for (var i = 0; i < this.children.length; i++)
    {
        this.children[i]._renderCanvas(renderSession);
    }

    if (this._mask)
    {
        renderSession.maskManager.popMask(renderSession);
    }

};

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

/**
 * The Sprite object is the base for all textured objects that are rendered to the screen
 *
 * @class Sprite
 * @extends DisplayObjectContainer
 * @constructor
 * @param texture {Texture} The texture for this sprite
 *
 * A sprite can be created directly from an image like this :
 * var sprite = new PIXI.Sprite.fromImage('assets/image.png');
 * yourStage.addChild(sprite);
 * then obviously don't forget to add it to the stage you have already created
 */
PIXI.Sprite = function(texture)
{
    PIXI.DisplayObjectContainer.call(this);

    /**
     * The anchor sets the origin point of the texture.
     * The default is 0,0 this means the texture's origin is the top left
     * Setting than anchor to 0.5,0.5 means the textures origin is centered
     * Setting the anchor to 1,1 would mean the textures origin points will be the bottom right corner
     *
     * @property anchor
     * @type Point
     */
    this.anchor = new PIXI.Point();

    /**
     * The texture that the sprite is using
     *
     * @property texture
     * @type Texture
     */
    this.texture = texture || PIXI.Texture.emptyTexture;

    /**
     * The width of the sprite (this is initially set by the texture)
     *
     * @property _width
     * @type Number
     * @private
     */
    this._width = 0;

    /**
     * The height of the sprite (this is initially set by the texture)
     *
     * @property _height
     * @type Number
     * @private
     */
    this._height = 0;

    /**
     * The tint applied to the sprite. This is a hex value. A value of 0xFFFFFF will remove any tint effect.
     *
     * @property tint
     * @type Number
     * @default 0xFFFFFF
     */
    this.tint = 0xFFFFFF;

    /**
     * The tint applied to the sprite. This is a hex value. A value of 0xFFFFFF will remove any tint effect.
     *
     * @property cachedTint
     * @private
     * @type Number
     * @default -1
     */
    this.cachedTint = -1;

    /**
     * A canvas that contains the tinted version of the Sprite (in Canvas mode, WebGL doesn't populate this)
     *
     * @property tintedTexture
     * @type Canvas
     * @default null
     */
    this.tintedTexture = null;

    /**
     * The blend mode to be applied to the sprite. Set to PIXI.blendModes.NORMAL to remove any blend mode.
     *
     * Warning: You cannot have a blend mode and a filter active on the same Sprite. Doing so will render the sprite invisible.
     *
     * @property blendMode
     * @type Number
     * @default PIXI.blendModes.NORMAL;
     */
    this.blendMode = PIXI.blendModes.NORMAL;

    /**
     * The shader that will be used to render the texture to the stage. Set to null to remove a current shader.
     *
     * @property shader
     * @type AbstractFilter
     * @default null
     */
    this.shader = null;

    if (this.texture.baseTexture.hasLoaded)
    {
        this.onTextureUpdate();
    }

    this.renderable = true;

};

// constructor
PIXI.Sprite.prototype = Object.create(PIXI.DisplayObjectContainer.prototype);
PIXI.Sprite.prototype.constructor = PIXI.Sprite;

/**
 * The width of the sprite, setting this will actually modify the scale to achieve the value set
 *
 * @property width
 * @type Number
 */
Object.defineProperty(PIXI.Sprite.prototype, 'width', {

    get: function() {
        return this.scale.x * this.texture.frame.width;
    },

    set: function(value) {
        this.scale.x = value / this.texture.frame.width;
        this._width = value;
    }

});

/**
 * The height of the sprite, setting this will actually modify the scale to achieve the value set
 *
 * @property height
 * @type Number
 */
Object.defineProperty(PIXI.Sprite.prototype, 'height', {

    get: function() {
        return  this.scale.y * this.texture.frame.height;
    },

    set: function(value) {
        this.scale.y = value / this.texture.frame.height;
        this._height = value;
    }

});

/**
 * Sets the texture of the sprite. Be warned that this doesn't remove or destroy the previous
 * texture this Sprite was using.
 *
 * @method setTexture
 * @param texture {Texture} The PIXI texture that is displayed by the sprite
 * @param [destroy=false] {boolean} Call Texture.destroy on the current texture before replacing it with the new one?
 */
PIXI.Sprite.prototype.setTexture = function(texture, destroyBase)
{
    if (destroyBase !== undefined)
    {
        this.texture.baseTexture.destroy();
    }

    //  Over-ridden by loadTexture as needed
    this.texture.baseTexture.skipRender = false;
    this.texture = texture;
    this.texture.valid = true;
};

/**
 * When the texture is updated, this event will fire to update the scale and frame
 *
 * @method onTextureUpdate
 * @param event
 * @private
 */
PIXI.Sprite.prototype.onTextureUpdate = function()
{
    // so if _width is 0 then width was not set..
    if (this._width) this.scale.x = this._width / this.texture.frame.width;
    if (this._height) this.scale.y = this._height / this.texture.frame.height;
};

/**
* Returns the bounds of the Sprite as a rectangle. The bounds calculation takes the worldTransform into account.
*
* @method getBounds
* @param matrix {Matrix} the transformation matrix of the sprite
* @return {Rectangle} the framing rectangle
*/
PIXI.Sprite.prototype.getBounds = function(matrix)
{
    var width = this.texture.frame.width;
    var height = this.texture.frame.height;

    var w0 = width * (1-this.anchor.x);
    var w1 = width * -this.anchor.x;

    var h0 = height * (1-this.anchor.y);
    var h1 = height * -this.anchor.y;

    var worldTransform = matrix || this.worldTransform;

    var a = worldTransform.a;
    var b = worldTransform.b;
    var c = worldTransform.c;
    var d = worldTransform.d;
    var tx = worldTransform.tx;
    var ty = worldTransform.ty;

    var maxX = -Infinity;
    var maxY = -Infinity;

    var minX = Infinity;
    var minY = Infinity;

    if (b === 0 && c === 0)
    {
        // scale may be negative!
        if (a < 0)
        {
            a *= -1;
            var temp = w0;
            w0 = -w1;
            w1 = -temp; 
        }

        if (d < 0)
        {
            d *= -1;
            var temp = h0;
            h0 = -h1;
            h1 = -temp; 
        }

        // this means there is no rotation going on right? RIGHT?
        // if thats the case then we can avoid checking the bound values! yay         
        minX = a * w1 + tx;
        maxX = a * w0 + tx;
        minY = d * h1 + ty;
        maxY = d * h0 + ty;
    }
    else
    {
        var x1 = a * w1 + c * h1 + tx;
        var y1 = d * h1 + b * w1 + ty;

        var x2 = a * w0 + c * h1 + tx;
        var y2 = d * h1 + b * w0 + ty;

        var x3 = a * w0 + c * h0 + tx;
        var y3 = d * h0 + b * w0 + ty;

        var x4 =  a * w1 + c * h0 + tx;
        var y4 =  d * h0 + b * w1 + ty;

        minX = x1 < minX ? x1 : minX;
        minX = x2 < minX ? x2 : minX;
        minX = x3 < minX ? x3 : minX;
        minX = x4 < minX ? x4 : minX;

        minY = y1 < minY ? y1 : minY;
        minY = y2 < minY ? y2 : minY;
        minY = y3 < minY ? y3 : minY;
        minY = y4 < minY ? y4 : minY;

        maxX = x1 > maxX ? x1 : maxX;
        maxX = x2 > maxX ? x2 : maxX;
        maxX = x3 > maxX ? x3 : maxX;
        maxX = x4 > maxX ? x4 : maxX;

        maxY = y1 > maxY ? y1 : maxY;
        maxY = y2 > maxY ? y2 : maxY;
        maxY = y3 > maxY ? y3 : maxY;
        maxY = y4 > maxY ? y4 : maxY;
    }

    var bounds = this._bounds;

    bounds.x = minX;
    bounds.width = maxX - minX;

    bounds.y = minY;
    bounds.height = maxY - minY;

    // store a reference so that if this function gets called again in the render cycle we do not have to recalculate
    this._currentBounds = bounds;

    return bounds;
};

/**
* Renders the object using the WebGL renderer
*
* @method _renderWebGL
* @param renderSession {RenderSession}
* @param {Matrix} [matrix] - Optional matrix. If provided the Display Object will be rendered using this matrix, otherwise it will use its worldTransform.
* @private
*/
PIXI.Sprite.prototype._renderWebGL = function(renderSession, matrix)
{
    // if the sprite is not visible or the alpha is 0 then no need to render this element
    if (!this.visible || this.alpha <= 0 || !this.renderable) return;

    //  They provided an alternative rendering matrix, so use it
    var wt = this.worldTransform;

    if (matrix)
    {
        wt = matrix;
    }

    //  A quick check to see if this element has a mask or a filter.
    if (this._mask || this._filters)
    {
        var spriteBatch = renderSession.spriteBatch;

        // push filter first as we need to ensure the stencil buffer is correct for any masking
        if (this._filters)
        {
            spriteBatch.flush();
            renderSession.filterManager.pushFilter(this._filterBlock);
        }

        if (this._mask)
        {
            spriteBatch.stop();
            renderSession.maskManager.pushMask(this.mask, renderSession);
            spriteBatch.start();
        }

        // add this sprite to the batch
        spriteBatch.render(this);

        // now loop through the children and make sure they get rendered
        for (var i = 0; i < this.children.length; i++)
        {
            this.children[i]._renderWebGL(renderSession);
        }

        // time to stop the sprite batch as either a mask element or a filter draw will happen next
        spriteBatch.stop();

        if (this._mask) renderSession.maskManager.popMask(this._mask, renderSession);
        if (this._filters) renderSession.filterManager.popFilter();

        spriteBatch.start();
    }
    else
    {
        renderSession.spriteBatch.render(this);

        //  Render children!
        for (var i = 0; i < this.children.length; i++)
        {
            this.children[i]._renderWebGL(renderSession, wt);
        }

    }
};

/**
* Renders the object using the Canvas renderer
*
* @method _renderCanvas
* @param renderSession {RenderSession}
* @param {Matrix} [matrix] - Optional matrix. If provided the Display Object will be rendered using this matrix, otherwise it will use its worldTransform.
* @private
*/
PIXI.Sprite.prototype._renderCanvas = function(renderSession, matrix)
{
    // If the sprite is not visible or the alpha is 0 then no need to render this element
    if (!this.visible || this.alpha === 0 || !this.renderable || this.texture.crop.width <= 0 || this.texture.crop.height <= 0)
    {
        return;
    }

    var wt = this.worldTransform;

    //  If they provided an alternative rendering matrix then use it
    if (matrix)
    {
        wt = matrix;
    }

    if (this.blendMode !== renderSession.currentBlendMode)
    {
        renderSession.currentBlendMode = this.blendMode;
        renderSession.context.globalCompositeOperation = PIXI.blendModesCanvas[renderSession.currentBlendMode];
    }

    if (this._mask)
    {
        renderSession.maskManager.pushMask(this._mask, renderSession);
    }

    //  Ignore null sources
    if (this.texture.valid)
    {
        var resolution = this.texture.baseTexture.resolution / renderSession.resolution;

        renderSession.context.globalAlpha = this.worldAlpha;

         //  If smoothingEnabled is supported and we need to change the smoothing property for this texture
        if (renderSession.smoothProperty && renderSession.scaleMode !== this.texture.baseTexture.scaleMode)
        {
            renderSession.scaleMode = this.texture.baseTexture.scaleMode;
            renderSession.context[renderSession.smoothProperty] = (renderSession.scaleMode === PIXI.scaleModes.LINEAR);
        }

        //  If the texture is trimmed we offset by the trim x/y, otherwise we use the frame dimensions
        var dx = (this.texture.trim) ? this.texture.trim.x - this.anchor.x * this.texture.trim.width : this.anchor.x * -this.texture.frame.width;
        var dy = (this.texture.trim) ? this.texture.trim.y - this.anchor.y * this.texture.trim.height : this.anchor.y * -this.texture.frame.height;

        //  Allow for pixel rounding
        if (renderSession.roundPixels)
        {
            renderSession.context.setTransform(wt.a, wt.b, wt.c, wt.d, (wt.tx * renderSession.resolution) | 0, (wt.ty * renderSession.resolution) | 0);
            dx |= 0;
            dy |= 0;
        }
        else
        {
            renderSession.context.setTransform(wt.a, wt.b, wt.c, wt.d, wt.tx * renderSession.resolution, wt.ty * renderSession.resolution);
        }

        var cw = this.texture.crop.width;
        var ch = this.texture.crop.height;

        dx /= resolution;
        dy /= resolution;

        if (this.tint !== 0xFFFFFF)
        {
            if (this.texture.requiresReTint || this.cachedTint !== this.tint)
            {
                this.tintedTexture = PIXI.CanvasTinter.getTintedTexture(this, this.tint);

                this.cachedTint = this.tint;
            }

            renderSession.context.drawImage(this.tintedTexture, 0, 0, cw, ch, dx, dy, cw / resolution, ch / resolution);
        }
        else
        {
            var cx = this.texture.crop.x;
            var cy = this.texture.crop.y;
            renderSession.context.drawImage(this.texture.baseTexture.source, cx, cy, cw, ch, dx, dy, cw / resolution, ch / resolution);
        }
    }

    for (var i = 0; i < this.children.length; i++)
    {
        this.children[i]._renderCanvas(renderSession);
    }

    if (this._mask)
    {
        renderSession.maskManager.popMask(renderSession);
    }

};

// some helper functions..

/**
 *
 * Helper function that creates a sprite that will contain a texture from the TextureCache based on the frameId
 * The frame ids are created when a Texture packer file has been loaded
 *
 * @method fromFrame
 * @static
 * @param frameId {String} The frame Id of the texture in the cache
 * @return {Sprite} A new Sprite using a texture from the texture cache matching the frameId
 */
PIXI.Sprite.fromFrame = function(frameId)
{
    var texture = PIXI.TextureCache[frameId];

    if (!texture) throw new Error('The frameId "' + frameId + '" does not exist in the texture cache' + this);

    return new PIXI.Sprite(texture);
};

/**
 *
 * Helper function that creates a sprite that will contain a texture based on an image url
 * If the image is not in the texture cache it will be loaded
 *
 * @method fromImage
 * @static
 * @param imageId {String} The image url of the texture
 * @return {Sprite} A new Sprite using a texture from the texture cache matching the image id
 */
PIXI.Sprite.fromImage = function(imageId, crossorigin, scaleMode)
{
    var texture = PIXI.Texture.fromImage(imageId, crossorigin, scaleMode);

    return new PIXI.Sprite(texture);
};

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

/**
 * The SpriteBatch class is a really fast version of the DisplayObjectContainer 
 * built solely for speed, so use when you need a lot of sprites or particles.
 * And it's extremely easy to use : 

    var container = new PIXI.SpriteBatch();
 
    stage.addChild(container);
 
    for(var i  = 0; i < 100; i++)
    {
        var sprite = new PIXI.Sprite.fromImage("myImage.png");
        container.addChild(sprite);
    }
 * And here you have a hundred sprites that will be renderer at the speed of light
 *
 * @class SpriteBatch
 * @constructor
 * @param texture {Texture}
 */
PIXI.SpriteBatch = function(texture)
{
    PIXI.DisplayObjectContainer.call( this);

    this.textureThing = texture;

    this.ready = false;
};

PIXI.SpriteBatch.prototype = Object.create(PIXI.DisplayObjectContainer.prototype);
PIXI.SpriteBatch.prototype.constructor = PIXI.SpriteBatch;

/*
 * Initialises the spriteBatch
 *
 * @method initWebGL
 * @param gl {WebGLContext} the current WebGL drawing context
 */
PIXI.SpriteBatch.prototype.initWebGL = function(gl)
{
    // TODO only one needed for the whole engine really?
    this.fastSpriteBatch = new PIXI.WebGLFastSpriteBatch(gl);

    this.ready = true;
};

/*
 * Updates the object transform for rendering
 *
 * @method updateTransform
 * @private
 */
PIXI.SpriteBatch.prototype.updateTransform = function()
{
    // TODO don't need to!
    this.displayObjectUpdateTransform();
    //  PIXI.DisplayObjectContainer.prototype.updateTransform.call( this );
};

/**
* Renders the object using the WebGL renderer
*
* @method _renderWebGL
* @param renderSession {RenderSession} 
* @private
*/
PIXI.SpriteBatch.prototype._renderWebGL = function(renderSession)
{
    if (!this.visible || this.alpha <= 0 || !this.children.length) return;

    if (!this.ready)
    {
        this.initWebGL(renderSession.gl);
    }
    
    if (this.fastSpriteBatch.gl !== renderSession.gl)
    {
        this.fastSpriteBatch.setContext(renderSession.gl);
    }

    renderSession.spriteBatch.stop();
    
    renderSession.shaderManager.setShader(renderSession.shaderManager.fastShader);
    
    this.fastSpriteBatch.begin(this, renderSession);
    this.fastSpriteBatch.render(this);

    renderSession.spriteBatch.start();
 
};

/**
* Renders the object using the Canvas renderer
*
* @method _renderCanvas
* @param renderSession {RenderSession} 
* @private
*/
PIXI.SpriteBatch.prototype._renderCanvas = function(renderSession)
{
    if (!this.visible || this.alpha <= 0 || !this.children.length) return;
    
    var context = renderSession.context;

    context.globalAlpha = this.worldAlpha;

    this.displayObjectUpdateTransform();

    var transform = this.worldTransform;
       
    var isRotated = true;

    for (var i = 0; i < this.children.length; i++)
    {
        var child = this.children[i];

        if (!child.visible) continue;

        var texture = child.texture;
        var frame = texture.frame;

        context.globalAlpha = this.worldAlpha * child.alpha;

        if (child.rotation % (Math.PI * 2) === 0)
        {
            if (isRotated)
            {
                context.setTransform(transform.a, transform.b, transform.c, transform.d, transform.tx, transform.ty);
                isRotated = false;
            }

            // this is the fastest  way to optimise! - if rotation is 0 then we can avoid any kind of setTransform call
            context.drawImage(texture.baseTexture.source,
                                 frame.x,
                                 frame.y,
                                 frame.width,
                                 frame.height,
                                 ((child.anchor.x) * (-frame.width * child.scale.x) + child.position.x  + 0.5) | 0,
                                 ((child.anchor.y) * (-frame.height * child.scale.y) + child.position.y  + 0.5) | 0,
                                 frame.width * child.scale.x,
                                 frame.height * child.scale.y);
        }
        else
        {
            if (!isRotated) isRotated = true;
    
            child.displayObjectUpdateTransform();
           
            var childTransform = child.worldTransform;

            // allow for trimming
           
            if (renderSession.roundPixels)
            {
                context.setTransform(childTransform.a, childTransform.b, childTransform.c, childTransform.d, childTransform.tx | 0, childTransform.ty | 0);
            }
            else
            {
                context.setTransform(childTransform.a, childTransform.b, childTransform.c, childTransform.d, childTransform.tx, childTransform.ty);
            }

            context.drawImage(texture.baseTexture.source,
                                 frame.x,
                                 frame.y,
                                 frame.width,
                                 frame.height,
                                 ((child.anchor.x) * (-frame.width) + 0.5) | 0,
                                 ((child.anchor.y) * (-frame.height) + 0.5) | 0,
                                 frame.width,
                                 frame.height);
        }
    }

};

/**
 * @author Mat Groves http://matgroves.com/ @Doormat23
 */
 
/**
 * Converts a hex color number to an [R, G, B] array
 *
 * @method hex2rgb
 * @param hex {Number}
 */
PIXI.hex2rgb = function(hex) {
    return [(hex >> 16 & 0xFF) / 255, ( hex >> 8 & 0xFF) / 255, (hex & 0xFF)/ 255];
};

/**
 * Converts a color as an [R, G, B] array to a hex number
 *
 * @method rgb2hex
 * @param rgb {Array}
 */
PIXI.rgb2hex = function(rgb) {
    return ((rgb[0]*255 << 16) + (rgb[1]*255 << 8) + rgb[2]*255);
};

/**
 * Checks whether the Canvas BlendModes are supported by the current browser for drawImage
 *
 * @method canUseNewCanvasBlendModes
 * @return {Boolean} whether they are supported
 */
PIXI.canUseNewCanvasBlendModes = function()
{
    if (document === undefined) return false;

    var pngHead = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAABAQMAAADD8p2OAAAAA1BMVEX/';
    var pngEnd = 'AAAACklEQVQI12NgAAAAAgAB4iG8MwAAAABJRU5ErkJggg==';

    var magenta = new Image();
    magenta.src = pngHead + 'AP804Oa6' + pngEnd;

    var yellow = new Image();
    yellow.src = pngHead + '/wCKxvRF' + pngEnd;

    var canvas = PIXI.CanvasPool.create(this, 6, 1);
    var context = canvas.getContext('2d');
    context.globalCompositeOperation = 'multiply';
    context.drawImage(magenta, 0, 0);
    context.drawImage(yellow, 2, 0);

    if (!context.getImageData(2,0,1,1))
    {
        return false;
    }

    var data = context.getImageData(2,0,1,1).data;

    PIXI.CanvasPool.remove(this);

    return (data[0] === 255 && data[1] === 0 && data[2] === 0);

};

/**
 * Given a number, this function returns the closest number that is a power of two
 * this function is taken from Starling Framework as its pretty neat ;)
 *
 * @method getNextPowerOfTwo
 * @param number {Number}
 * @return {Number} the closest number that is a power of two
 */
PIXI.getNextPowerOfTwo = function(number)
{
    if (number > 0 && (number & (number - 1)) === 0) // see: http://goo.gl/D9kPj
        return number;
    else
    {
        var result = 1;
        while (result < number) result <<= 1;
        return result;
    }
};

/**
 * checks if the given width and height make a power of two texture
 * @method isPowerOfTwo
 * @param width {Number}
 * @param height {Number}
 * @return {Boolean} 
 */
PIXI.isPowerOfTwo = function(width, height)
{
    return (width > 0 && (width & (width - 1)) === 0 && height > 0 && (height & (height - 1)) === 0);

};

/**
* @author       Richard Davey <rich@photonstorm.com>
* @copyright    2015 Photon Storm Ltd.
* @license      {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
*/

/**
* The CanvasPool is a global static object that allows Pixi and Phaser to pool canvas DOM elements.
*
* @class CanvasPool
* @static
*/
PIXI.CanvasPool = {

    /**
    * Creates a new Canvas DOM element, or pulls one from the pool if free.
    * 
    * @method create
    * @static
    * @param parent {any} The parent of the canvas element.
    * @param width {number} The width of the canvas element.
    * @param height {number} The height of the canvas element.
    * @return {HTMLCanvasElement} The canvas element.
    */
    create: function (parent, width, height) {

        var idx = PIXI.CanvasPool.getFirst();
        var canvas;

        if (idx === -1)
        {
            var container = {
                parent: parent,
                canvas: document.createElement('canvas')
            }

            PIXI.CanvasPool.pool.push(container);

            canvas = container.canvas;
        }
        else
        {
            PIXI.CanvasPool.pool[idx].parent = parent;

            canvas = PIXI.CanvasPool.pool[idx].canvas;
        }

        if (width !== undefined)
        {
            canvas.width = width;
            canvas.height = height;
        }

        return canvas;

    },

    /**
    * Gets the first free canvas index from the pool.
    * 
    * @method getFirst
    * @static
    * @return {number}
    */
    getFirst: function () {

        var pool = PIXI.CanvasPool.pool;

        for (var i = 0; i < pool.length; i++)
        {
            if (pool[i].parent === null)
            {
                return i;
            }
        }

        return -1;

    },

    /**
    * Removes the parent from a canvas element from the pool, freeing it up for re-use.
    * 
    * @method remove
    * @param parent {any} The parent of the canvas element.
    * @static
    */
    remove: function (parent) {

        var pool = PIXI.CanvasPool.pool;

        for (var i = 0; i < pool.length; i++)
        {
            if (pool[i].parent === parent)
            {
                pool[i].parent = null;
            }
        }

    },

    /**
    * Removes the parent from a canvas element from the pool, freeing it up for re-use.
    * 
    * @method removeByCanvas
    * @param canvas {HTMLCanvasElement} The canvas element to remove
    * @static
    */
    removeByCanvas: function (canvas) {

        var pool = PIXI.CanvasPool.pool;

        for (var i = 0; i < pool.length; i++)
        {
            if (pool[i].canvas === canvas)
            {
                pool[i].parent = null;
            }
        }

    },

    /**
    * Gets the total number of used canvas elements in the pool.
    * 
    * @method getTotal
    * @static
    * @return {number} The number of in-use (parented) canvas elements in the pool.
    */
    getTotal: function () {

        var pool = PIXI.CanvasPool.pool;
        var c = 0;

        for (var i = 0; i < pool.length; i++)
        {
            if (pool[i].parent !== null)
            {
                c++;
            }
        }

        return c;

    },

    /**
    * Gets the total number of free canvas elements in the pool.
    * 
    * @method getFree
    * @static
    * @return {number} The number of free (un-parented) canvas elements in the pool.
    */
    getFree: function () {

        var pool = PIXI.CanvasPool.pool;
        var c = 0;

        for (var i = 0; i < pool.length; i++)
        {
            if (pool[i].parent === null)
            {
                c++;
            }
        }

        return c;

    }

};

/**
 * The pool into which the canvas dom elements are placed.
 *
 * @property pool
 * @type Array
 * @static
 */
PIXI.CanvasPool.pool = [];

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

/**
* @method initDefaultShaders
* @static
* @private
*/
PIXI.initDefaultShaders = function()
{
};

/**
* @method CompileVertexShader
* @static
* @param gl {WebGLContext} the current WebGL drawing context
* @param shaderSrc {Array}
* @return {Any}
*/
PIXI.CompileVertexShader = function(gl, shaderSrc)
{
    return PIXI._CompileShader(gl, shaderSrc, gl.VERTEX_SHADER);
};

/**
* @method CompileFragmentShader
* @static
* @param gl {WebGLContext} the current WebGL drawing context
* @param shaderSrc {Array}
* @return {Any}
*/
PIXI.CompileFragmentShader = function(gl, shaderSrc)
{
    return PIXI._CompileShader(gl, shaderSrc, gl.FRAGMENT_SHADER);
};

/**
* @method _CompileShader
* @static
* @private
* @param gl {WebGLContext} the current WebGL drawing context
* @param shaderSrc {Array}
* @param shaderType {Number}
* @return {Any}
*/
PIXI._CompileShader = function(gl, shaderSrc, shaderType)
{
    var src = shaderSrc;

    if (Array.isArray(shaderSrc))
    {
        src = shaderSrc.join("\n");
    }

    var shader = gl.createShader(shaderType);
    gl.shaderSource(shader, src);
    gl.compileShader(shader);

    if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS))
    {
        window.console.log(gl.getShaderInfoLog(shader));
        return null;
    }

    return shader;
};

/**
* @method compileProgram
* @static
* @param gl {WebGLContext} the current WebGL drawing context
* @param vertexSrc {Array}
* @param fragmentSrc {Array}
* @return {Any}
*/
PIXI.compileProgram = function(gl, vertexSrc, fragmentSrc)
{
    var fragmentShader = PIXI.CompileFragmentShader(gl, fragmentSrc);
    var vertexShader = PIXI.CompileVertexShader(gl, vertexSrc);

    var shaderProgram = gl.createProgram();

    gl.attachShader(shaderProgram, vertexShader);
    gl.attachShader(shaderProgram, fragmentShader);
    gl.linkProgram(shaderProgram);

    if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS))
    {
        window.console.log("Could not initialise shaders");
    }

    return shaderProgram;
};

/**
 * @author Mat Groves http://matgroves.com/ @Doormat23
 * @author Richard Davey http://www.photonstorm.com @photonstorm
 */

/**
* @class PixiShader
* @constructor
* @param gl {WebGLContext} the current WebGL drawing context
*/
PIXI.PixiShader = function(gl)
{
    /**
     * @property _UID
     * @type Number
     * @private
     */
    this._UID = PIXI._UID++;

    /**
     * @property gl
     * @type WebGLContext
     */
    this.gl = gl;

    /**
     * The WebGL program.
     * @property program
     * @type Any
     */
    this.program = null;

    /**
     * The fragment shader.
     * @property fragmentSrc
     * @type Array
     */
    this.fragmentSrc = [
        'precision lowp float;',
        'varying vec2 vTextureCoord;',
        'varying vec4 vColor;',
        'uniform sampler2D uSampler;',
        'void main(void) {',
        '   gl_FragColor = texture2D(uSampler, vTextureCoord) * vColor ;',
        '}'
    ];

    /**
     * A local texture counter for multi-texture shaders.
     * @property textureCount
     * @type Number
     */
    this.textureCount = 0;

    /**
     * A local flag
     * @property firstRun
     * @type Boolean
     * @private
     */
    this.firstRun = true;

    /**
     * A dirty flag
     * @property dirty
     * @type Boolean
     */
    this.dirty = true;

    /**
     * Uniform attributes cache.
     * @property attributes
     * @type Array
     * @private
     */
    this.attributes = [];

    this.init();
};

PIXI.PixiShader.prototype.constructor = PIXI.PixiShader;

/**
* Initialises the shader.
*
* @method init
*/
PIXI.PixiShader.prototype.init = function()
{
    var gl = this.gl;

    var program = PIXI.compileProgram(gl, this.vertexSrc || PIXI.PixiShader.defaultVertexSrc, this.fragmentSrc);

    gl.useProgram(program);

    // get and store the uniforms for the shader
    this.uSampler = gl.getUniformLocation(program, 'uSampler');
    this.projectionVector = gl.getUniformLocation(program, 'projectionVector');
    this.offsetVector = gl.getUniformLocation(program, 'offsetVector');
    this.dimensions = gl.getUniformLocation(program, 'dimensions');

    // get and store the attributes
    this.aVertexPosition = gl.getAttribLocation(program, 'aVertexPosition');
    this.aTextureCoord = gl.getAttribLocation(program, 'aTextureCoord');
    this.colorAttribute = gl.getAttribLocation(program, 'aColor');

    // Begin worst hack eva //

    // WHY??? ONLY on my chrome pixel the line above returns -1 when using filters?
    // maybe its something to do with the current state of the gl context.
    // I'm convinced this is a bug in the chrome browser as there is NO reason why this should be returning -1 especially as it only manifests on my chrome pixel
    // If theres any webGL people that know why could happen please help :)
    if(this.colorAttribute === -1)
    {
        this.colorAttribute = 2;
    }

    this.attributes = [this.aVertexPosition, this.aTextureCoord, this.colorAttribute];

    // End worst hack eva //

    // add those custom shaders!
    for (var key in this.uniforms)
    {
        // get the uniform locations..
        this.uniforms[key].uniformLocation = gl.getUniformLocation(program, key);
    }

    this.initUniforms();

    this.program = program;
};

/**
* Initialises the shader uniform values.
*
* Uniforms are specified in the GLSL_ES Specification: http://www.khronos.org/registry/webgl/specs/latest/1.0/
* http://www.khronos.org/registry/gles/specs/2.0/GLSL_ES_Specification_1.0.17.pdf
*
* @method initUniforms
*/
PIXI.PixiShader.prototype.initUniforms = function()
{
    this.textureCount = 1;
    var gl = this.gl;
    var uniform;

    for (var key in this.uniforms)
    {
        uniform = this.uniforms[key];

        var type = uniform.type;

        if (type === 'sampler2D')
        {
            uniform._init = false;

            if (uniform.value !== null)
            {
                this.initSampler2D(uniform);
            }
        }
        else if (type === 'mat2' || type === 'mat3' || type === 'mat4')
        {
            //  These require special handling
            uniform.glMatrix = true;
            uniform.glValueLength = 1;

            if (type === 'mat2')
            {
                uniform.glFunc = gl.uniformMatrix2fv;
            }
            else if (type === 'mat3')
            {
                uniform.glFunc = gl.uniformMatrix3fv;
            }
            else if (type === 'mat4')
            {
                uniform.glFunc = gl.uniformMatrix4fv;
            }
        }
        else
        {
            //  GL function reference
            uniform.glFunc = gl['uniform' + type];

            if (type === '2f' || type === '2i')
            {
                uniform.glValueLength = 2;
            }
            else if (type === '3f' || type === '3i')
            {
                uniform.glValueLength = 3;
            }
            else if (type === '4f' || type === '4i')
            {
                uniform.glValueLength = 4;
            }
            else
            {
                uniform.glValueLength = 1;
            }
        }
    }

};

/**
* Initialises a Sampler2D uniform (which may only be available later on after initUniforms once the texture has loaded)
*
* @method initSampler2D
*/
PIXI.PixiShader.prototype.initSampler2D = function(uniform)
{
    if (!uniform.value || !uniform.value.baseTexture || !uniform.value.baseTexture.hasLoaded)
    {
        return;
    }

    var gl = this.gl;

    gl.activeTexture(gl['TEXTURE' + this.textureCount]);
    gl.bindTexture(gl.TEXTURE_2D, uniform.value.baseTexture._glTextures[gl.id]);

    //  Extended texture data
    if (uniform.textureData)
    {
        var data = uniform.textureData;

        // GLTexture = mag linear, min linear_mipmap_linear, wrap repeat + gl.generateMipmap(gl.TEXTURE_2D);
        // GLTextureLinear = mag/min linear, wrap clamp
        // GLTextureNearestRepeat = mag/min NEAREST, wrap repeat
        // GLTextureNearest = mag/min nearest, wrap clamp
        // AudioTexture = whatever + luminance + width 512, height 2, border 0
        // KeyTexture = whatever + luminance + width 256, height 2, border 0

        //  magFilter can be: gl.LINEAR, gl.LINEAR_MIPMAP_LINEAR or gl.NEAREST
        //  wrapS/T can be: gl.CLAMP_TO_EDGE or gl.REPEAT

        var magFilter = (data.magFilter) ? data.magFilter : gl.LINEAR;
        var minFilter = (data.minFilter) ? data.minFilter : gl.LINEAR;
        var wrapS = (data.wrapS) ? data.wrapS : gl.CLAMP_TO_EDGE;
        var wrapT = (data.wrapT) ? data.wrapT : gl.CLAMP_TO_EDGE;
        var format = (data.luminance) ? gl.LUMINANCE : gl.RGBA;

        if (data.repeat)
        {
            wrapS = gl.REPEAT;
            wrapT = gl.REPEAT;
        }

        gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, !!data.flipY);

        if (data.width)
        {
            var width = (data.width) ? data.width : 512;
            var height = (data.height) ? data.height : 2;
            var border = (data.border) ? data.border : 0;

            // void texImage2D(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, ArrayBufferView? pixels);
            gl.texImage2D(gl.TEXTURE_2D, 0, format, width, height, border, format, gl.UNSIGNED_BYTE, null);
        }
        else
        {
            //  void texImage2D(GLenum target, GLint level, GLenum internalformat, GLenum format, GLenum type, ImageData? pixels);
            gl.texImage2D(gl.TEXTURE_2D, 0, format, gl.RGBA, gl.UNSIGNED_BYTE, uniform.value.baseTexture.source);
        }

        gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, magFilter);
        gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, minFilter);
        gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, wrapS);
        gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, wrapT);
    }

    gl.uniform1i(uniform.uniformLocation, this.textureCount);

    uniform._init = true;

    this.textureCount++;

};

/**
* Updates the shader uniform values.
*
* @method syncUniforms
*/
PIXI.PixiShader.prototype.syncUniforms = function()
{
    this.textureCount = 1;
    var uniform;
    var gl = this.gl;

    //  This would probably be faster in an array and it would guarantee key order
    for (var key in this.uniforms)
    {
        uniform = this.uniforms[key];

        if (uniform.glValueLength === 1)
        {
            if (uniform.glMatrix === true)
            {
                uniform.glFunc.call(gl, uniform.uniformLocation, uniform.transpose, uniform.value);
            }
            else
            {
                uniform.glFunc.call(gl, uniform.uniformLocation, uniform.value);
            }
        }
        else if (uniform.glValueLength === 2)
        {
            uniform.glFunc.call(gl, uniform.uniformLocation, uniform.value.x, uniform.value.y);
        }
        else if (uniform.glValueLength === 3)
        {
            uniform.glFunc.call(gl, uniform.uniformLocation, uniform.value.x, uniform.value.y, uniform.value.z);
        }
        else if (uniform.glValueLength === 4)
        {
            uniform.glFunc.call(gl, uniform.uniformLocation, uniform.value.x, uniform.value.y, uniform.value.z, uniform.value.w);
        }
        else if (uniform.type === 'sampler2D')
        {
            if (uniform._init)
            {
                gl.activeTexture(gl['TEXTURE' + this.textureCount]);

                if(uniform.value.baseTexture._dirty[gl.id])
                {
                    PIXI.instances[gl.id].updateTexture(uniform.value.baseTexture);
                }
                else
                {
                    // bind the current texture
                    gl.bindTexture(gl.TEXTURE_2D, uniform.value.baseTexture._glTextures[gl.id]);
                }

                //  gl.bindTexture(gl.TEXTURE_2D, uniform.value.baseTexture._glTextures[gl.id] || PIXI.createWebGLTexture( uniform.value.baseTexture, gl));
                gl.uniform1i(uniform.uniformLocation, this.textureCount);
                this.textureCount++;
            }
            else
            {
                this.initSampler2D(uniform);
            }
        }
    }

};

/**
* Destroys the shader.
*
* @method destroy
*/
PIXI.PixiShader.prototype.destroy = function()
{
    this.gl.deleteProgram( this.program );
    this.uniforms = null;
    this.gl = null;

    this.attributes = null;
};

/**
* The Default Vertex shader source.
*
* @property defaultVertexSrc
* @type String
*/
PIXI.PixiShader.defaultVertexSrc = [
    'attribute vec2 aVertexPosition;',
    'attribute vec2 aTextureCoord;',
    'attribute vec4 aColor;',

    'uniform vec2 projectionVector;',
    'uniform vec2 offsetVector;',

    'varying vec2 vTextureCoord;',
    'varying vec4 vColor;',

    'const vec2 center = vec2(-1.0, 1.0);',

    'void main(void) {',
    '   gl_Position = vec4( ((aVertexPosition + offsetVector) / projectionVector) + center , 0.0, 1.0);',
    '   vTextureCoord = aTextureCoord;',
    '   vColor = vec4(aColor.rgb * aColor.a, aColor.a);',
    '}'
];
/**
 * @author Mat Groves http://matgroves.com/ @Doormat23
 */

/**
* @class PixiFastShader
* @constructor
* @param gl {WebGLContext} the current WebGL drawing context
*/
PIXI.PixiFastShader = function(gl)
{
    /**
     * @property _UID
     * @type Number
     * @private
     */
    this._UID = PIXI._UID++;
    
    /**
     * @property gl
     * @type WebGLContext
     */
    this.gl = gl;

    /**
     * The WebGL program.
     * @property program
     * @type Any
     */
    this.program = null;

    /**
     * The fragment shader.
     * @property fragmentSrc
     * @type Array
     */
    this.fragmentSrc = [
        'precision lowp float;',
        'varying vec2 vTextureCoord;',
        'varying float vColor;',
        'uniform sampler2D uSampler;',
        'void main(void) {',
        '   gl_FragColor = texture2D(uSampler, vTextureCoord) * vColor ;',
        '}'
    ];

    /**
     * The vertex shader.
     * @property vertexSrc
     * @type Array
     */
    this.vertexSrc = [
        'attribute vec2 aVertexPosition;',
        'attribute vec2 aPositionCoord;',
        'attribute vec2 aScale;',
        'attribute float aRotation;',
        'attribute vec2 aTextureCoord;',
        'attribute float aColor;',

        'uniform vec2 projectionVector;',
        'uniform vec2 offsetVector;',
        'uniform mat3 uMatrix;',

        'varying vec2 vTextureCoord;',
        'varying float vColor;',

        'const vec2 center = vec2(-1.0, 1.0);',

        'void main(void) {',
        '   vec2 v;',
        '   vec2 sv = aVertexPosition * aScale;',
        '   v.x = (sv.x) * cos(aRotation) - (sv.y) * sin(aRotation);',
        '   v.y = (sv.x) * sin(aRotation) + (sv.y) * cos(aRotation);',
        '   v = ( uMatrix * vec3(v + aPositionCoord , 1.0) ).xy ;',
        '   gl_Position = vec4( ( v / projectionVector) + center , 0.0, 1.0);',
        '   vTextureCoord = aTextureCoord;',
      //  '   vec3 color = mod(vec3(aColor.y/65536.0, aColor.y/256.0, aColor.y), 256.0) / 256.0;',
        '   vColor = aColor;',
        '}'
    ];

    /**
     * A local texture counter for multi-texture shaders.
     * @property textureCount
     * @type Number
     */
    this.textureCount = 0;
    
    this.init();
};

PIXI.PixiFastShader.prototype.constructor = PIXI.PixiFastShader;

/**
* Initialises the shader.
* 
* @method init
*/
PIXI.PixiFastShader.prototype.init = function()
{
    var gl = this.gl;

    var program = PIXI.compileProgram(gl, this.vertexSrc, this.fragmentSrc);
    
    gl.useProgram(program);

    // get and store the uniforms for the shader
    this.uSampler = gl.getUniformLocation(program, 'uSampler');

    this.projectionVector = gl.getUniformLocation(program, 'projectionVector');
    this.offsetVector = gl.getUniformLocation(program, 'offsetVector');
    this.dimensions = gl.getUniformLocation(program, 'dimensions');
    this.uMatrix = gl.getUniformLocation(program, 'uMatrix');

    // get and store the attributes
    this.aVertexPosition = gl.getAttribLocation(program, 'aVertexPosition');
    this.aPositionCoord = gl.getAttribLocation(program, 'aPositionCoord');

    this.aScale = gl.getAttribLocation(program, 'aScale');
    this.aRotation = gl.getAttribLocation(program, 'aRotation');

    this.aTextureCoord = gl.getAttribLocation(program, 'aTextureCoord');
    this.colorAttribute = gl.getAttribLocation(program, 'aColor');
   
    // Begin worst hack eva //

    // WHY??? ONLY on my chrome pixel the line above returns -1 when using filters?
    // maybe its somthing to do with the current state of the gl context.
    // Im convinced this is a bug in the chrome browser as there is NO reason why this should be returning -1 especially as it only manifests on my chrome pixel
    // If theres any webGL people that know why could happen please help :)
    if(this.colorAttribute === -1)
    {
        this.colorAttribute = 2;
    }

    this.attributes = [this.aVertexPosition, this.aPositionCoord,  this.aScale, this.aRotation, this.aTextureCoord, this.colorAttribute];
    
    // End worst hack eva //

    this.program = program;
};

/**
* Destroys the shader.
* 
* @method destroy
*/
PIXI.PixiFastShader.prototype.destroy = function()
{
    this.gl.deleteProgram( this.program );
    this.uniforms = null;
    this.gl = null;

    this.attributes = null;
};

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

/**
* @class StripShader
* @constructor
* @param gl {WebGLContext} the current WebGL drawing context
*/
PIXI.StripShader = function(gl)
{
    /**
     * @property _UID
     * @type Number
     * @private
     */
    this._UID = PIXI._UID++;
    
    /**
     * @property gl
     * @type WebGLContext
     */
    this.gl = gl;

    /**
     * The WebGL program.
     * @property program
     * @type Any
     */
    this.program = null;

    /**
     * The fragment shader.
     * @property fragmentSrc
     * @type Array
     */
    this.fragmentSrc = [
        'precision mediump float;',
        'varying vec2 vTextureCoord;',
     //   'varying float vColor;',
        'uniform float alpha;',
        'uniform sampler2D uSampler;',

        'void main(void) {',
        '   gl_FragColor = texture2D(uSampler, vec2(vTextureCoord.x, vTextureCoord.y)) * alpha;',
      //  '   gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);',//gl_FragColor * alpha;',
        '}'
    ];

    /**
     * The vertex shader.
     * @property vertexSrc
     * @type Array
     */
    this.vertexSrc  = [
        'attribute vec2 aVertexPosition;',
        'attribute vec2 aTextureCoord;',
        'uniform mat3 translationMatrix;',
        'uniform vec2 projectionVector;',
        'uniform vec2 offsetVector;',
      //  'uniform float alpha;',
       // 'uniform vec3 tint;',
        'varying vec2 vTextureCoord;',
      //  'varying vec4 vColor;',

        'void main(void) {',
        '   vec3 v = translationMatrix * vec3(aVertexPosition , 1.0);',
        '   v -= offsetVector.xyx;',
        '   gl_Position = vec4( v.x / projectionVector.x -1.0, v.y / -projectionVector.y + 1.0 , 0.0, 1.0);',
        '   vTextureCoord = aTextureCoord;',
       // '   vColor = aColor * vec4(tint * alpha, alpha);',
        '}'
    ];

    this.init();
};

PIXI.StripShader.prototype.constructor = PIXI.StripShader;

/**
* Initialises the shader.
* 
* @method init
*/
PIXI.StripShader.prototype.init = function()
{
    var gl = this.gl;

    var program = PIXI.compileProgram(gl, this.vertexSrc, this.fragmentSrc);
    gl.useProgram(program);

    // get and store the uniforms for the shader
    this.uSampler = gl.getUniformLocation(program, 'uSampler');
    this.projectionVector = gl.getUniformLocation(program, 'projectionVector');
    this.offsetVector = gl.getUniformLocation(program, 'offsetVector');
    this.colorAttribute = gl.getAttribLocation(program, 'aColor');
    //this.dimensions = gl.getUniformLocation(this.program, 'dimensions');

    // get and store the attributes
    this.aVertexPosition = gl.getAttribLocation(program, 'aVertexPosition');
    this.aTextureCoord = gl.getAttribLocation(program, 'aTextureCoord');

    this.attributes = [this.aVertexPosition, this.aTextureCoord];

    this.translationMatrix = gl.getUniformLocation(program, 'translationMatrix');
    this.alpha = gl.getUniformLocation(program, 'alpha');

    this.program = program;
};

/**
* Destroys the shader.
* 
* @method destroy
*/
PIXI.StripShader.prototype.destroy = function()
{
    this.gl.deleteProgram( this.program );
    this.uniforms = null;
    this.gl = null;

    this.attribute = null;
};

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

/**
* @class PrimitiveShader
* @constructor
* @param gl {WebGLContext} the current WebGL drawing context
*/
PIXI.PrimitiveShader = function(gl)
{
    /**
     * @property _UID
     * @type Number
     * @private
     */
    this._UID = PIXI._UID++;
 
    /**
     * @property gl
     * @type WebGLContext
     */
    this.gl = gl;

    /**
     * The WebGL program.
     * @property program
     * @type Any
     */
    this.program = null;

    /**
     * The fragment shader.
     * @property fragmentSrc
     * @type Array
     */
    this.fragmentSrc = [
        'precision mediump float;',
        'varying vec4 vColor;',

        'void main(void) {',
        '   gl_FragColor = vColor;',
        '}'
    ];

    /**
     * The vertex shader.
     * @property vertexSrc
     * @type Array
     */
    this.vertexSrc  = [
        'attribute vec2 aVertexPosition;',
        'attribute vec4 aColor;',
        'uniform mat3 translationMatrix;',
        'uniform vec2 projectionVector;',
        'uniform vec2 offsetVector;',
        'uniform float alpha;',
        'uniform float flipY;',
        'uniform vec3 tint;',
        'varying vec4 vColor;',

        'void main(void) {',
        '   vec3 v = translationMatrix * vec3(aVertexPosition , 1.0);',
        '   v -= offsetVector.xyx;',
        '   gl_Position = vec4( v.x / projectionVector.x -1.0, (v.y / projectionVector.y * -flipY) + flipY , 0.0, 1.0);',
        '   vColor = aColor * vec4(tint * alpha, alpha);',
        '}'
    ];

    this.init();
};

PIXI.PrimitiveShader.prototype.constructor = PIXI.PrimitiveShader;

/**
* Initialises the shader.
* 
* @method init
*/
PIXI.PrimitiveShader.prototype.init = function()
{
    var gl = this.gl;

    var program = PIXI.compileProgram(gl, this.vertexSrc, this.fragmentSrc);
    gl.useProgram(program);

    // get and store the uniforms for the shader
    this.projectionVector = gl.getUniformLocation(program, 'projectionVector');
    this.offsetVector = gl.getUniformLocation(program, 'offsetVector');
    this.tintColor = gl.getUniformLocation(program, 'tint');
    this.flipY = gl.getUniformLocation(program, 'flipY');

    // get and store the attributes
    this.aVertexPosition = gl.getAttribLocation(program, 'aVertexPosition');
    this.colorAttribute = gl.getAttribLocation(program, 'aColor');

    this.attributes = [this.aVertexPosition, this.colorAttribute];

    this.translationMatrix = gl.getUniformLocation(program, 'translationMatrix');
    this.alpha = gl.getUniformLocation(program, 'alpha');

    this.program = program;
};

/**
* Destroys the shader.
* 
* @method destroy
*/
PIXI.PrimitiveShader.prototype.destroy = function()
{
    this.gl.deleteProgram( this.program );
    this.uniforms = null;
    this.gl = null;

    this.attributes = null;
};

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

/**
* @class ComplexPrimitiveShader
* @constructor
* @param gl {WebGLContext} the current WebGL drawing context
*/
PIXI.ComplexPrimitiveShader = function(gl)
{
    /**
     * @property _UID
     * @type Number
     * @private
     */
    this._UID = PIXI._UID++;

    /**
     * @property gl
     * @type WebGLContext
     */
    this.gl = gl;

    /**
     * The WebGL program.
     * @property program
     * @type Any
     */
    this.program = null;

    /**
     * The fragment shader.
     * @property fragmentSrc
     * @type Array
     */
    this.fragmentSrc = [

        'precision mediump float;',

        'varying vec4 vColor;',

        'void main(void) {',
        '   gl_FragColor = vColor;',
        '}'
    ];

    /**
     * The vertex shader.
     * @property vertexSrc
     * @type Array
     */
    this.vertexSrc  = [
        'attribute vec2 aVertexPosition;',
        //'attribute vec4 aColor;',
        'uniform mat3 translationMatrix;',
        'uniform vec2 projectionVector;',
        'uniform vec2 offsetVector;',
        
        'uniform vec3 tint;',
        'uniform float alpha;',
        'uniform vec3 color;',
        'uniform float flipY;',
        'varying vec4 vColor;',

        'void main(void) {',
        '   vec3 v = translationMatrix * vec3(aVertexPosition , 1.0);',
        '   v -= offsetVector.xyx;',
        '   gl_Position = vec4( v.x / projectionVector.x -1.0, (v.y / projectionVector.y * -flipY) + flipY , 0.0, 1.0);',
        '   vColor = vec4(color * alpha * tint, alpha);',//" * vec4(tint * alpha, alpha);',
        '}'
    ];

    this.init();
};

PIXI.ComplexPrimitiveShader.prototype.constructor = PIXI.ComplexPrimitiveShader;

/**
* Initialises the shader.
* 
* @method init
*/
PIXI.ComplexPrimitiveShader.prototype.init = function()
{
    var gl = this.gl;

    var program = PIXI.compileProgram(gl, this.vertexSrc, this.fragmentSrc);
    gl.useProgram(program);

    // get and store the uniforms for the shader
    this.projectionVector = gl.getUniformLocation(program, 'projectionVector');
    this.offsetVector = gl.getUniformLocation(program, 'offsetVector');
    this.tintColor = gl.getUniformLocation(program, 'tint');
    this.color = gl.getUniformLocation(program, 'color');
    this.flipY = gl.getUniformLocation(program, 'flipY');

    // get and store the attributes
    this.aVertexPosition = gl.getAttribLocation(program, 'aVertexPosition');
   // this.colorAttribute = gl.getAttribLocation(program, 'aColor');

    this.attributes = [this.aVertexPosition, this.colorAttribute];

    this.translationMatrix = gl.getUniformLocation(program, 'translationMatrix');
    this.alpha = gl.getUniformLocation(program, 'alpha');

    this.program = program;
};

/**
* Destroys the shader.
* 
* @method destroy
*/
PIXI.ComplexPrimitiveShader.prototype.destroy = function()
{
    this.gl.deleteProgram( this.program );
    this.uniforms = null;
    this.gl = null;

    this.attribute = null;
};

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

PIXI.glContexts = []; // this is where we store the webGL contexts for easy access.
PIXI.instances = [];

/**
 * The WebGLRenderer draws the stage and all its content onto a webGL enabled canvas. This renderer
 * should be used for browsers that support webGL. This Render works by automatically managing webGLBatchs.
 * So no need for Sprite Batches or Sprite Clouds.
 * Don't forget to add the view to your DOM or you will not see anything :)
 *
 * @class WebGLRenderer
 * @constructor
 * @param game {Phaser.Game} A reference to the Phaser Game instance
 */
PIXI.WebGLRenderer = function(game) {

    /**
    * @property {Phaser.Game} game - A reference to the Phaser Game instance.
    */
    this.game = game;

    if (!PIXI.defaultRenderer)
    {
        PIXI.defaultRenderer = this;
    }

    /**
     * @property type
     * @type Number
     */
    this.type = PIXI.WEBGL_RENDERER;

    /**
     * The resolution of the renderer
     *
     * @property resolution
     * @type Number
     * @default 1
     */
    this.resolution = game.resolution;

    /**
     * Whether the render view is transparent
     *
     * @property transparent
     * @type Boolean
     */
    this.transparent = game.transparent;

    /**
     * Whether the render view should be resized automatically
     *
     * @property autoResize
     * @type Boolean
     */
    this.autoResize = false;

    /**
     * The value of the preserveDrawingBuffer flag affects whether or not the contents of the stencil buffer is retained after rendering.
     *
     * @property preserveDrawingBuffer
     * @type Boolean
     */
    this.preserveDrawingBuffer = game.preserveDrawingBuffer;

    /**
     * This sets if the WebGLRenderer will clear the context texture or not before the new render pass. If true:
     * If the Stage is NOT transparent, Pixi will clear to alpha (0, 0, 0, 0).
     * If the Stage is transparent, Pixi will clear to the target Stage's background color.
     * Disable this by setting this to false. For example: if your game has a canvas filling background image, you often don't need this set.
     *
     * @property clearBeforeRender
     * @type Boolean
     * @default
     */
    this.clearBeforeRender = game.clearBeforeRender;

    /**
     * The width of the canvas view
     *
     * @property width
     * @type Number
     */
    this.width = game.width;

    /**
     * The height of the canvas view
     *
     * @property height
     * @type Number
     */
    this.height = game.height;

    /**
     * The canvas element that everything is drawn to
     *
     * @property view
     * @type HTMLCanvasElement
     */
    this.view = game.canvas;

    /**
     * @property _contextOptions
     * @type Object
     * @private
     */
    this._contextOptions = {
        alpha: this.transparent,
        antialias: game.antialias,
        premultipliedAlpha: this.transparent && this.transparent !== 'notMultiplied',
        stencil: true,
        preserveDrawingBuffer: this.preserveDrawingBuffer
    };

    /**
     * @property projection
     * @type Point
     */
    this.projection = new PIXI.Point();

    /**
     * @property offset
     * @type Point
     */
    this.offset = new PIXI.Point();

    // time to create the render managers! each one focuses on managing a state in webGL

    /**
     * Deals with managing the shader programs and their attribs
     * @property shaderManager
     * @type WebGLShaderManager
     */
    this.shaderManager = new PIXI.WebGLShaderManager();

    /**
     * Manages the rendering of sprites
     * @property spriteBatch
     * @type WebGLSpriteBatch
     */
    this.spriteBatch = new PIXI.WebGLSpriteBatch();

    /**
     * Manages the masks using the stencil buffer
     * @property maskManager
     * @type WebGLMaskManager
     */
    this.maskManager = new PIXI.WebGLMaskManager();

    /**
     * Manages the filters
     * @property filterManager
     * @type WebGLFilterManager
     */
    this.filterManager = new PIXI.WebGLFilterManager();

    /**
     * Manages the stencil buffer
     * @property stencilManager
     * @type WebGLStencilManager
     */
    this.stencilManager = new PIXI.WebGLStencilManager();

    /**
     * Manages the blendModes
     * @property blendModeManager
     * @type WebGLBlendModeManager
     */
    this.blendModeManager = new PIXI.WebGLBlendModeManager();

    /**
     * @property renderSession
     * @type Object
     */
    this.renderSession = {};

    //  Needed?
    this.renderSession.game = this.game;
    this.renderSession.gl = this.gl;
    this.renderSession.drawCount = 0;
    this.renderSession.shaderManager = this.shaderManager;
    this.renderSession.maskManager = this.maskManager;
    this.renderSession.filterManager = this.filterManager;
    this.renderSession.blendModeManager = this.blendModeManager;
    this.renderSession.spriteBatch = this.spriteBatch;
    this.renderSession.stencilManager = this.stencilManager;
    this.renderSession.renderer = this;
    this.renderSession.resolution = this.resolution;

    // time init the context..
    this.initContext();

    // map some webGL blend modes..
    this.mapBlendModes();

};

// constructor
PIXI.WebGLRenderer.prototype.constructor = PIXI.WebGLRenderer;

/**
* @method initContext
*/
PIXI.WebGLRenderer.prototype.initContext = function()
{
    var gl = this.view.getContext('webgl', this._contextOptions) || this.view.getContext('experimental-webgl', this._contextOptions);

    this.gl = gl;

    if (!gl) {
        // fail, not able to get a context
        throw new Error('This browser does not support webGL. Try using the canvas renderer');
    }

    this.glContextId = gl.id = PIXI.WebGLRenderer.glContextId++;

    PIXI.glContexts[this.glContextId] = gl;

    PIXI.instances[this.glContextId] = this;

    // set up the default pixi settings..
    gl.disable(gl.DEPTH_TEST);
    gl.disable(gl.CULL_FACE);
    gl.enable(gl.BLEND);

    // need to set the context for all the managers...
    this.shaderManager.setContext(gl);
    this.spriteBatch.setContext(gl);
    this.maskManager.setContext(gl);
    this.filterManager.setContext(gl);
    this.blendModeManager.setContext(gl);
    this.stencilManager.setContext(gl);

    this.renderSession.gl = this.gl;

    // now resize and we are good to go!
    this.resize(this.width, this.height);
};

/**
 * Renders the stage to its webGL view
 *
 * @method render
 * @param stage {Stage} the Stage element to be rendered
 */
PIXI.WebGLRenderer.prototype.render = function(stage)
{
    // no point rendering if our context has been blown up!
    if (this.contextLost)
    {
        return;
    }

    // update the scene graph
    stage.updateTransform();

    var gl = this.gl;

    // -- Does this need to be set every frame? -- //
    gl.viewport(0, 0, this.width, this.height);

    // make sure we are bound to the main frame buffer
    gl.bindFramebuffer(gl.FRAMEBUFFER, null);

    if (this.game.clearBeforeRender)
    {
        gl.clearColor(stage._bgColor.r, stage._bgColor.g, stage._bgColor.b, stage._bgColor.a);

        gl.clear(gl.COLOR_BUFFER_BIT);
    }

    this.renderDisplayObject(stage, this.projection);
};

/**
 * Renders a Display Object.
 *
 * @method renderDisplayObject
 * @param displayObject {DisplayObject} The DisplayObject to render
 * @param projection {Point} The projection
 * @param buffer {Array} a standard WebGL buffer
 */
PIXI.WebGLRenderer.prototype.renderDisplayObject = function(displayObject, projection, buffer, matrix)
{
    this.renderSession.blendModeManager.setBlendMode(PIXI.blendModes.NORMAL);

    // reset the render session data..
    this.renderSession.drawCount = 0;

    // make sure to flip the Y if using a render texture..
    this.renderSession.flipY = buffer ? -1 : 1;

    // set the default projection
    this.renderSession.projection = projection;

    //set the default offset
    this.renderSession.offset = this.offset;

    // start the sprite batch
    this.spriteBatch.begin(this.renderSession);

    // start the filter manager
    this.filterManager.begin(this.renderSession, buffer);

    // render the scene!
    displayObject._renderWebGL(this.renderSession, matrix);

    // finish the sprite batch
    this.spriteBatch.end();
};

/**
 * Resizes the webGL view to the specified width and height.
 *
 * @method resize
 * @param width {Number} the new width of the webGL view
 * @param height {Number} the new height of the webGL view
 */
PIXI.WebGLRenderer.prototype.resize = function(width, height)
{
    this.width = width * this.resolution;
    this.height = height * this.resolution;

    this.view.width = this.width;
    this.view.height = this.height;

    if (this.autoResize) {
        this.view.style.width = this.width / this.resolution + 'px';
        this.view.style.height = this.height / this.resolution + 'px';
    }

    this.gl.viewport(0, 0, this.width, this.height);

    this.projection.x =  this.width / 2 / this.resolution;
    this.projection.y =  -this.height / 2 / this.resolution;
};

/**
 * Updates and Creates a WebGL texture for the renderers context.
 *
 * @method updateTexture
 * @param texture {Texture} the texture to update
 * @return {boolean} True if the texture was successfully bound, otherwise false.
 */
PIXI.WebGLRenderer.prototype.updateTexture = function(texture)
{
    if (!texture.hasLoaded)
    {
        return false;
    }

    var gl = this.gl;

    if (!texture._glTextures[gl.id])
    {
        texture._glTextures[gl.id] = gl.createTexture();
    }

    gl.bindTexture(gl.TEXTURE_2D, texture._glTextures[gl.id]);

    gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, texture.premultipliedAlpha);

    gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, texture.source);

    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, texture.scaleMode === PIXI.scaleModes.LINEAR ? gl.LINEAR : gl.NEAREST);

    if (texture.mipmap && PIXI.isPowerOfTwo(texture.width, texture.height))
    {
        gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, texture.scaleMode === PIXI.scaleModes.LINEAR ? gl.LINEAR_MIPMAP_LINEAR : gl.NEAREST_MIPMAP_NEAREST);
        gl.generateMipmap(gl.TEXTURE_2D);
    }
    else
    {
        gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, texture.scaleMode === PIXI.scaleModes.LINEAR ? gl.LINEAR : gl.NEAREST);
    }

    if (!texture._powerOf2)
    {
        gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
        gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
    }
    else
    {
        gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT);
        gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT);
    }

    texture._dirty[gl.id] = false;

    // return texture._glTextures[gl.id];
    return true;

};

/**
 * Removes everything from the renderer (event listeners, spritebatch, etc...)
 *
 * @method destroy
 */
PIXI.WebGLRenderer.prototype.destroy = function()
{
    PIXI.glContexts[this.glContextId] = null;

    this.projection = null;
    this.offset = null;

    this.shaderManager.destroy();
    this.spriteBatch.destroy();
    this.maskManager.destroy();
    this.filterManager.destroy();

    this.shaderManager = null;
    this.spriteBatch = null;
    this.maskManager = null;
    this.filterManager = null;

    this.gl = null;
    this.renderSession = null;

    PIXI.CanvasPool.remove(this);

    PIXI.instances[this.glContextId] = null;

    PIXI.WebGLRenderer.glContextId--;
};

/**
 * Maps Pixi blend modes to WebGL blend modes.
 *
 * @method mapBlendModes
 */
PIXI.WebGLRenderer.prototype.mapBlendModes = function()
{
    var gl = this.gl;

    if (!PIXI.blendModesWebGL)
    {
        var b = [];
        var modes = PIXI.blendModes;

        b[modes.NORMAL]        = [gl.ONE,       gl.ONE_MINUS_SRC_ALPHA];
        b[modes.ADD]           = [gl.SRC_ALPHA, gl.DST_ALPHA];
        b[modes.MULTIPLY]      = [gl.DST_COLOR, gl.ONE_MINUS_SRC_ALPHA];
        b[modes.SCREEN]        = [gl.SRC_ALPHA, gl.ONE];
        b[modes.OVERLAY]       = [gl.ONE,       gl.ONE_MINUS_SRC_ALPHA];
        b[modes.DARKEN]        = [gl.ONE,       gl.ONE_MINUS_SRC_ALPHA];
        b[modes.LIGHTEN]       = [gl.ONE,       gl.ONE_MINUS_SRC_ALPHA];
        b[modes.COLOR_DODGE]   = [gl.ONE,       gl.ONE_MINUS_SRC_ALPHA];
        b[modes.COLOR_BURN]    = [gl.ONE,       gl.ONE_MINUS_SRC_ALPHA];
        b[modes.HARD_LIGHT]    = [gl.ONE,       gl.ONE_MINUS_SRC_ALPHA];
        b[modes.SOFT_LIGHT]    = [gl.ONE,       gl.ONE_MINUS_SRC_ALPHA];
        b[modes.DIFFERENCE]    = [gl.ONE,       gl.ONE_MINUS_SRC_ALPHA];
        b[modes.EXCLUSION]     = [gl.ONE,       gl.ONE_MINUS_SRC_ALPHA];
        b[modes.HUE]           = [gl.ONE,       gl.ONE_MINUS_SRC_ALPHA];
        b[modes.SATURATION]    = [gl.ONE,       gl.ONE_MINUS_SRC_ALPHA];
        b[modes.COLOR]         = [gl.ONE,       gl.ONE_MINUS_SRC_ALPHA];
        b[modes.LUMINOSITY]    = [gl.ONE,       gl.ONE_MINUS_SRC_ALPHA];

        PIXI.blendModesWebGL = b;
    }
};

PIXI.WebGLRenderer.glContextId = 0;

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

/**
* @class WebGLBlendModeManager
* @constructor
* @param gl {WebGLContext} the current WebGL drawing context
*/
PIXI.WebGLBlendModeManager = function()
{
    /**
     * @property currentBlendMode
     * @type Number
     */
    this.currentBlendMode = 99999;
};

PIXI.WebGLBlendModeManager.prototype.constructor = PIXI.WebGLBlendModeManager;

/**
 * Sets the WebGL Context.
 *
 * @method setContext
 * @param gl {WebGLContext} the current WebGL drawing context
 */
PIXI.WebGLBlendModeManager.prototype.setContext = function(gl)
{
    this.gl = gl;
};

/**
* Sets-up the given blendMode from WebGL's point of view.
* 
* @method setBlendMode 
* @param blendMode {Number} the blendMode, should be a Pixi const, such as PIXI.BlendModes.ADD
*/
PIXI.WebGLBlendModeManager.prototype.setBlendMode = function(blendMode)
{
    if(this.currentBlendMode === blendMode)return false;

    this.currentBlendMode = blendMode;
    
    var blendModeWebGL = PIXI.blendModesWebGL[this.currentBlendMode];

    if (blendModeWebGL)
    {
        this.gl.blendFunc(blendModeWebGL[0], blendModeWebGL[1]);
    }
    
    return true;
};

/**
* Destroys this object.
* 
* @method destroy
*/
PIXI.WebGLBlendModeManager.prototype.destroy = function()
{
    this.gl = null;
};

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

/**
* @class WebGLMaskManager
* @constructor
* @private
*/
PIXI.WebGLMaskManager = function()
{
};

PIXI.WebGLMaskManager.prototype.constructor = PIXI.WebGLMaskManager;

/**
* Sets the drawing context to the one given in parameter.
* 
* @method setContext 
* @param gl {WebGLContext} the current WebGL drawing context
*/
PIXI.WebGLMaskManager.prototype.setContext = function(gl)
{
    this.gl = gl;
};

/**
* Applies the Mask and adds it to the current filter stack.
* 
* @method pushMask
* @param maskData {Array}
* @param renderSession {Object}
*/
PIXI.WebGLMaskManager.prototype.pushMask = function(maskData, renderSession)
{
    var gl = renderSession.gl;

    if (maskData.dirty)
    {
        PIXI.WebGLGraphics.updateGraphics(maskData, gl);
    }

    if (maskData._webGL[gl.id] === undefined || maskData._webGL[gl.id].data === undefined || maskData._webGL[gl.id].data.length === 0)
    {
        return;
    }

    renderSession.stencilManager.pushStencil(maskData, maskData._webGL[gl.id].data[0], renderSession);
};

/**
* Removes the last filter from the filter stack and doesn't return it.
* 
* @method popMask
* @param maskData {Array}
* @param renderSession {Object} an object containing all the useful parameters
*/
PIXI.WebGLMaskManager.prototype.popMask = function(maskData, renderSession)
{
    var gl = this.gl;

    if (maskData._webGL[gl.id] === undefined || maskData._webGL[gl.id].data === undefined || maskData._webGL[gl.id].data.length === 0)
    {
        return;
    }

    renderSession.stencilManager.popStencil(maskData, maskData._webGL[gl.id].data[0], renderSession);

};

/**
* Destroys the mask stack.
* 
* @method destroy
*/
PIXI.WebGLMaskManager.prototype.destroy = function()
{
    this.gl = null;
};

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

/**
* @class WebGLStencilManager
* @constructor
* @private
*/
PIXI.WebGLStencilManager = function()
{
    this.stencilStack = [];
    this.reverse = true;
    this.count = 0;
};

/**
* Sets the drawing context to the one given in parameter.
* 
* @method setContext 
* @param gl {WebGLContext} the current WebGL drawing context
*/
PIXI.WebGLStencilManager.prototype.setContext = function(gl)
{
    this.gl = gl;
};

/**
* Applies the Mask and adds it to the current filter stack.
* 
* @method pushMask
* @param graphics {Graphics}
* @param webGLData {Array}
* @param renderSession {Object}
*/
PIXI.WebGLStencilManager.prototype.pushStencil = function(graphics, webGLData, renderSession)
{
    var gl = this.gl;
    this.bindGraphics(graphics, webGLData, renderSession);

    if(this.stencilStack.length === 0)
    {
        gl.enable(gl.STENCIL_TEST);
        gl.clear(gl.STENCIL_BUFFER_BIT);
        this.reverse = true;
        this.count = 0;
    }

    this.stencilStack.push(webGLData);

    var level = this.count;

    gl.colorMask(false, false, false, false);

    gl.stencilFunc(gl.ALWAYS,0,0xFF);
    gl.stencilOp(gl.KEEP,gl.KEEP,gl.INVERT);

    // draw the triangle strip!

    if(webGLData.mode === 1)
    {
        gl.drawElements(gl.TRIANGLE_FAN,  webGLData.indices.length - 4, gl.UNSIGNED_SHORT, 0 );
       
        if(this.reverse)
        {
            gl.stencilFunc(gl.EQUAL, 0xFF - level, 0xFF);
            gl.stencilOp(gl.KEEP,gl.KEEP,gl.DECR);
        }
        else
        {
            gl.stencilFunc(gl.EQUAL,level, 0xFF);
            gl.stencilOp(gl.KEEP,gl.KEEP,gl.INCR);
        }

        // draw a quad to increment..
        gl.drawElements(gl.TRIANGLE_FAN, 4, gl.UNSIGNED_SHORT, ( webGLData.indices.length - 4 ) * 2 );
               
        if(this.reverse)
        {
            gl.stencilFunc(gl.EQUAL,0xFF-(level+1), 0xFF);
        }
        else
        {
            gl.stencilFunc(gl.EQUAL,level+1, 0xFF);
        }

        this.reverse = !this.reverse;
    }
    else
    {
        if(!this.reverse)
        {
            gl.stencilFunc(gl.EQUAL, 0xFF - level, 0xFF);
            gl.stencilOp(gl.KEEP,gl.KEEP,gl.DECR);
        }
        else
        {
            gl.stencilFunc(gl.EQUAL,level, 0xFF);
            gl.stencilOp(gl.KEEP,gl.KEEP,gl.INCR);
        }

        gl.drawElements(gl.TRIANGLE_STRIP,  webGLData.indices.length, gl.UNSIGNED_SHORT, 0 );

        if(!this.reverse)
        {
            gl.stencilFunc(gl.EQUAL,0xFF-(level+1), 0xFF);
        }
        else
        {
            gl.stencilFunc(gl.EQUAL,level+1, 0xFF);
        }
    }

    gl.colorMask(true, true, true, true);
    gl.stencilOp(gl.KEEP,gl.KEEP,gl.KEEP);

    this.count++;
};

/**
 * TODO this does not belong here!
 * 
 * @method bindGraphics
 * @param graphics {Graphics}
 * @param webGLData {Array}
 * @param renderSession {Object}
 */
PIXI.WebGLStencilManager.prototype.bindGraphics = function(graphics, webGLData, renderSession)
{
    //if(this._currentGraphics === graphics)return;
    this._currentGraphics = graphics;

    var gl = this.gl;

     // bind the graphics object..
    var projection = renderSession.projection,
        offset = renderSession.offset,
        shader;// = renderSession.shaderManager.primitiveShader;

    if(webGLData.mode === 1)
    {
        shader = renderSession.shaderManager.complexPrimitiveShader;

        renderSession.shaderManager.setShader( shader );

        gl.uniform1f(shader.flipY, renderSession.flipY);
       
        gl.uniformMatrix3fv(shader.translationMatrix, false, graphics.worldTransform.toArray(true));

        gl.uniform2f(shader.projectionVector, projection.x, -projection.y);
        gl.uniform2f(shader.offsetVector, -offset.x, -offset.y);

        gl.uniform3fv(shader.tintColor, PIXI.hex2rgb(graphics.tint));
        gl.uniform3fv(shader.color, webGLData.color);

        gl.uniform1f(shader.alpha, graphics.worldAlpha * webGLData.alpha);

        gl.bindBuffer(gl.ARRAY_BUFFER, webGLData.buffer);

        gl.vertexAttribPointer(shader.aVertexPosition, 2, gl.FLOAT, false, 4 * 2, 0);


        // now do the rest..
        // set the index buffer!
        gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, webGLData.indexBuffer);
    }
    else
    {
        //renderSession.shaderManager.activatePrimitiveShader();
        shader = renderSession.shaderManager.primitiveShader;
        renderSession.shaderManager.setShader( shader );

        gl.uniformMatrix3fv(shader.translationMatrix, false, graphics.worldTransform.toArray(true));

        gl.uniform1f(shader.flipY, renderSession.flipY);
        gl.uniform2f(shader.projectionVector, projection.x, -projection.y);
        gl.uniform2f(shader.offsetVector, -offset.x, -offset.y);

        gl.uniform3fv(shader.tintColor, PIXI.hex2rgb(graphics.tint));

        gl.uniform1f(shader.alpha, graphics.worldAlpha);
        
        gl.bindBuffer(gl.ARRAY_BUFFER, webGLData.buffer);

        gl.vertexAttribPointer(shader.aVertexPosition, 2, gl.FLOAT, false, 4 * 6, 0);
        gl.vertexAttribPointer(shader.colorAttribute, 4, gl.FLOAT, false,4 * 6, 2 * 4);

        // set the index buffer!
        gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, webGLData.indexBuffer);
    }
};

/**
 * @method popStencil
 * @param graphics {Graphics}
 * @param webGLData {Array}
 * @param renderSession {Object}
 */
PIXI.WebGLStencilManager.prototype.popStencil = function(graphics, webGLData, renderSession)
{
	var gl = this.gl;
    this.stencilStack.pop();
   
    this.count--;

    if(this.stencilStack.length === 0)
    {
        // the stack is empty!
        gl.disable(gl.STENCIL_TEST);

    }
    else
    {

        var level = this.count;

        this.bindGraphics(graphics, webGLData, renderSession);

        gl.colorMask(false, false, false, false);
    
        if(webGLData.mode === 1)
        {
            this.reverse = !this.reverse;

            if(this.reverse)
            {
                gl.stencilFunc(gl.EQUAL, 0xFF - (level+1), 0xFF);
                gl.stencilOp(gl.KEEP,gl.KEEP,gl.INCR);
            }
            else
            {
                gl.stencilFunc(gl.EQUAL,level+1, 0xFF);
                gl.stencilOp(gl.KEEP,gl.KEEP,gl.DECR);
            }

            // draw a quad to increment..
            gl.drawElements(gl.TRIANGLE_FAN, 4, gl.UNSIGNED_SHORT, ( webGLData.indices.length - 4 ) * 2 );
            
            gl.stencilFunc(gl.ALWAYS,0,0xFF);
            gl.stencilOp(gl.KEEP,gl.KEEP,gl.INVERT);

            // draw the triangle strip!
            gl.drawElements(gl.TRIANGLE_FAN,  webGLData.indices.length - 4, gl.UNSIGNED_SHORT, 0 );
           
            if(!this.reverse)
            {
                gl.stencilFunc(gl.EQUAL,0xFF-(level), 0xFF);
            }
            else
            {
                gl.stencilFunc(gl.EQUAL,level, 0xFF);
            }

        }
        else
        {
          //  console.log("<<>>")
            if(!this.reverse)
            {
                gl.stencilFunc(gl.EQUAL, 0xFF - (level+1), 0xFF);
                gl.stencilOp(gl.KEEP,gl.KEEP,gl.INCR);
            }
            else
            {
                gl.stencilFunc(gl.EQUAL,level+1, 0xFF);
                gl.stencilOp(gl.KEEP,gl.KEEP,gl.DECR);
            }

            gl.drawElements(gl.TRIANGLE_STRIP,  webGLData.indices.length, gl.UNSIGNED_SHORT, 0 );

            if(!this.reverse)
            {
                gl.stencilFunc(gl.EQUAL,0xFF-(level), 0xFF);
            }
            else
            {
                gl.stencilFunc(gl.EQUAL,level, 0xFF);
            }
        }

        gl.colorMask(true, true, true, true);
        gl.stencilOp(gl.KEEP,gl.KEEP,gl.KEEP);


    }
};

/**
* Destroys the mask stack.
* 
* @method destroy
*/
PIXI.WebGLStencilManager.prototype.destroy = function()
{
    this.stencilStack = null;
    this.gl = null;
};

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

/**
* @class WebGLShaderManager
* @constructor
* @private
*/
PIXI.WebGLShaderManager = function()
{
    /**
     * @property maxAttibs
     * @type Number
     */
    this.maxAttibs = 10;

    /**
     * @property attribState
     * @type Array
     */
    this.attribState = [];

    /**
     * @property tempAttribState
     * @type Array
     */
    this.tempAttribState = [];

    for (var i = 0; i < this.maxAttibs; i++)
    {
        this.attribState[i] = false;
    }

    /**
     * @property stack
     * @type Array
     */
    this.stack = [];

};

PIXI.WebGLShaderManager.prototype.constructor = PIXI.WebGLShaderManager;

/**
* Initialises the context and the properties.
* 
* @method setContext 
* @param gl {WebGLContext} the current WebGL drawing context
*/
PIXI.WebGLShaderManager.prototype.setContext = function(gl)
{
    this.gl = gl;
    
    // the next one is used for rendering primitives
    this.primitiveShader = new PIXI.PrimitiveShader(gl);

    // the next one is used for rendering triangle strips
    this.complexPrimitiveShader = new PIXI.ComplexPrimitiveShader(gl);

    // this shader is used for the default sprite rendering
    this.defaultShader = new PIXI.PixiShader(gl);

    // this shader is used for the fast sprite rendering
    this.fastShader = new PIXI.PixiFastShader(gl);

    // the next one is used for rendering triangle strips
    this.stripShader = new PIXI.StripShader(gl);
    this.setShader(this.defaultShader);
};

/**
* Takes the attributes given in parameters.
* 
* @method setAttribs
* @param attribs {Array} attribs 
*/
PIXI.WebGLShaderManager.prototype.setAttribs = function(attribs)
{
    // reset temp state
    var i;

    for (i = 0; i < this.tempAttribState.length; i++)
    {
        this.tempAttribState[i] = false;
    }

    // set the new attribs
    for (i = 0; i < attribs.length; i++)
    {
        var attribId = attribs[i];
        this.tempAttribState[attribId] = true;
    }

    var gl = this.gl;

    for (i = 0; i < this.attribState.length; i++)
    {
        if(this.attribState[i] !== this.tempAttribState[i])
        {
            this.attribState[i] = this.tempAttribState[i];

            if(this.tempAttribState[i])
            {
                gl.enableVertexAttribArray(i);
            }
            else
            {
                gl.disableVertexAttribArray(i);
            }
        }
    }
};

/**
* Sets the current shader.
* 
* @method setShader
* @param shader {Any}
*/
PIXI.WebGLShaderManager.prototype.setShader = function(shader)
{
    if(this._currentId === shader._UID)return false;
    
    this._currentId = shader._UID;

    this.currentShader = shader;

    this.gl.useProgram(shader.program);
    this.setAttribs(shader.attributes);

    return true;
};

/**
* Destroys this object.
* 
* @method destroy
*/
PIXI.WebGLShaderManager.prototype.destroy = function()
{
    this.attribState = null;

    this.tempAttribState = null;

    this.primitiveShader.destroy();

    this.complexPrimitiveShader.destroy();

    this.defaultShader.destroy();

    this.fastShader.destroy();

    this.stripShader.destroy();

    this.gl = null;
};

/**
 * @author Mat Groves
 * 
 * Big thanks to the very clever Matt DesLauriers <mattdesl> https://github.com/mattdesl/
 * for creating the original pixi version!
 * Also a thanks to https://github.com/bchevalier for tweaking the tint and alpha so that they now share 4 bytes on the vertex buffer
 * 
 * Heavily inspired by LibGDX's WebGLSpriteBatch:
 * https://github.com/libgdx/libgdx/blob/master/gdx/src/com/badlogic/gdx/graphics/g2d/WebGLSpriteBatch.java
 */

 /**
 *
 * @class WebGLSpriteBatch
 * @private
 * @constructor
 */
PIXI.WebGLSpriteBatch = function()
{
    /**
     * @property vertSize
     * @type Number
     */
    this.vertSize = 5;

    /**
     * The number of images in the SpriteBatch before it flushes
     * @property size
     * @type Number
     */
    this.size = 2000;//Math.pow(2, 16) /  this.vertSize;

    //the total number of bytes in our batch
    var numVerts = this.size * 4 * 4 * this.vertSize;
    //the total number of indices in our batch
    var numIndices = this.size * 6;

    /**
    * Holds the vertices
    *
    * @property vertices
    * @type ArrayBuffer
    */
    this.vertices = new PIXI.ArrayBuffer(numVerts);

    /**
    * View on the vertices as a Float32Array
    *
    * @property positions
    * @type Float32Array
    */
    this.positions = new PIXI.Float32Array(this.vertices);

    /**
    * View on the vertices as a Uint32Array
    *
    * @property colors
    * @type Uint32Array
    */
    this.colors = new PIXI.Uint32Array(this.vertices);

    /**
     * Holds the indices
     *
     * @property indices
     * @type Uint16Array
     */
    this.indices = new PIXI.Uint16Array(numIndices);
    
    /**
     * @property lastIndexCount
     * @type Number
     */
    this.lastIndexCount = 0;

    for (var i=0, j=0; i < numIndices; i += 6, j += 4)
    {
        this.indices[i + 0] = j + 0;
        this.indices[i + 1] = j + 1;
        this.indices[i + 2] = j + 2;
        this.indices[i + 3] = j + 0;
        this.indices[i + 4] = j + 2;
        this.indices[i + 5] = j + 3;
    }

    /**
     * @property drawing
     * @type Boolean
     */
    this.drawing = false;

    /**
     * @property currentBatchSize
     * @type Number
     */
    this.currentBatchSize = 0;

    /**
     * @property currentBaseTexture
     * @type BaseTexture
     */
    this.currentBaseTexture = null;

    /**
     * @property dirty
     * @type Boolean
     */
    this.dirty = true;

    /**
     * @property textures
     * @type Array
     */
    this.textures = [];

    /**
     * @property blendModes
     * @type Array
     */
    this.blendModes = [];

    /**
     * @property shaders
     * @type Array
     */
    this.shaders = [];

    /**
     * @property sprites
     * @type Array
     */
    this.sprites = [];

    /**
     * @property defaultShader
     * @type AbstractFilter
     */
    this.defaultShader = new PIXI.AbstractFilter([
        'precision lowp float;',
        'varying vec2 vTextureCoord;',
        'varying vec4 vColor;',
        'uniform sampler2D uSampler;',
        'void main(void) {',
        '   gl_FragColor = texture2D(uSampler, vTextureCoord) * vColor ;',
        '}'
    ]);
};

/**
* @method setContext
* @param gl {WebGLContext} the current WebGL drawing context
*/
PIXI.WebGLSpriteBatch.prototype.setContext = function(gl)
{
    this.gl = gl;

    // create a couple of buffers
    this.vertexBuffer = gl.createBuffer();
    this.indexBuffer = gl.createBuffer();

    // 65535 is max index, so 65535 / 6 = 10922.

    //upload the index data
    gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this.indexBuffer);
    gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, this.indices, gl.STATIC_DRAW);

    gl.bindBuffer(gl.ARRAY_BUFFER, this.vertexBuffer);
    gl.bufferData(gl.ARRAY_BUFFER, this.vertices, gl.DYNAMIC_DRAW);

    this.currentBlendMode = 99999;

    var shader = new PIXI.PixiShader(gl);

    shader.fragmentSrc = this.defaultShader.fragmentSrc;
    shader.uniforms = {};
    shader.init();

    this.defaultShader.shaders[gl.id] = shader;
};

/**
* @method begin
* @param renderSession {Object} The RenderSession object
*/
PIXI.WebGLSpriteBatch.prototype.begin = function(renderSession)
{
    this.renderSession = renderSession;
    this.shader = this.renderSession.shaderManager.defaultShader;

    this.start();
};

/**
* @method end
*/
PIXI.WebGLSpriteBatch.prototype.end = function()
{
    this.flush();
};

/**
* @method render
* @param sprite {Sprite} the sprite to render when using this spritebatch
* @param {Matrix} [matrix] - Optional matrix. If provided the Display Object will be rendered using this matrix, otherwise it will use its worldTransform.
*/
PIXI.WebGLSpriteBatch.prototype.render = function(sprite, matrix)
{
    var texture = sprite.texture;

    //  They provided an alternative rendering matrix, so use it
    var wt = sprite.worldTransform;

    if (matrix)
    {
        wt = matrix;
    }

    // check texture..
    if (this.currentBatchSize >= this.size)
    {
        this.flush();
        this.currentBaseTexture = texture.baseTexture;
    }

    // get the uvs for the texture
    var uvs = texture._uvs;

    // if the uvs have not updated then no point rendering just yet!
    if (!uvs)
    {
        return;
    }

    var aX = sprite.anchor.x;
    var aY = sprite.anchor.y;

    var w0, w1, h0, h1;
        
    if (texture.trim)
    {
        // if the sprite is trimmed then we need to add the extra space before transforming the sprite coords.
        var trim = texture.trim;

        w1 = trim.x - aX * trim.width;
        w0 = w1 + texture.crop.width;

        h1 = trim.y - aY * trim.height;
        h0 = h1 + texture.crop.height;
    }
    else
    {
        w0 = (texture.frame.width) * (1-aX);
        w1 = (texture.frame.width) * -aX;

        h0 = texture.frame.height * (1-aY);
        h1 = texture.frame.height * -aY;
    }

    var i = this.currentBatchSize * 4 * this.vertSize;
    var resolution = texture.baseTexture.resolution;

    var a = wt.a / resolution;
    var b = wt.b / resolution;
    var c = wt.c / resolution;
    var d = wt.d / resolution;
    var tx = wt.tx;
    var ty = wt.ty;

    var colors = this.colors;
    var positions = this.positions;

    if (this.renderSession.roundPixels)
    {
        // xy
        positions[i] = a * w1 + c * h1 + tx | 0;
        positions[i+1] = d * h1 + b * w1 + ty | 0;

        // xy
        positions[i+5] = a * w0 + c * h1 + tx | 0;
        positions[i+6] = d * h1 + b * w0 + ty | 0;

         // xy
        positions[i+10] = a * w0 + c * h0 + tx | 0;
        positions[i+11] = d * h0 + b * w0 + ty | 0;

        // xy
        positions[i+15] = a * w1 + c * h0 + tx | 0;
        positions[i+16] = d * h0 + b * w1 + ty | 0;
    }
    else
    {
        // xy
        positions[i] = a * w1 + c * h1 + tx;
        positions[i+1] = d * h1 + b * w1 + ty;

        // xy
        positions[i+5] = a * w0 + c * h1 + tx;
        positions[i+6] = d * h1 + b * w0 + ty;

         // xy
        positions[i+10] = a * w0 + c * h0 + tx;
        positions[i+11] = d * h0 + b * w0 + ty;

        // xy
        positions[i+15] = a * w1 + c * h0 + tx;
        positions[i+16] = d * h0 + b * w1 + ty;
    }
    
    // uv
    positions[i+2] = uvs.x0;
    positions[i+3] = uvs.y0;

    // uv
    positions[i+7] = uvs.x1;
    positions[i+8] = uvs.y1;

     // uv
    positions[i+12] = uvs.x2;
    positions[i+13] = uvs.y2;

    // uv
    positions[i+17] = uvs.x3;
    positions[i+18] = uvs.y3;

    // color and alpha
    var tint = sprite.tint;

    colors[i+4] = colors[i+9] = colors[i+14] = colors[i+19] = (tint >> 16) + (tint & 0xff00) + ((tint & 0xff) << 16) + (sprite.worldAlpha * 255 << 24);

    // increment the batchsize
    this.sprites[this.currentBatchSize++] = sprite;

};

/**
* Renders a TilingSprite using the spriteBatch.
* 
* @method renderTilingSprite
* @param sprite {TilingSprite} the sprite to render
*/
PIXI.WebGLSpriteBatch.prototype.renderTilingSprite = function(sprite)
{
    var texture = sprite.tilingTexture;

    // check texture..
    if (this.currentBatchSize >= this.size)
    {
        this.flush();
        this.currentBaseTexture = texture.baseTexture;
    }

    // set the textures uvs temporarily
    if (!sprite._uvs)
    {
        sprite._uvs = new PIXI.TextureUvs();
    }

    var uvs = sprite._uvs;

    var w = texture.baseTexture.width;
    var h = texture.baseTexture.height;

    // var w = sprite._frame.sourceSizeW;
    // var h = sprite._frame.sourceSizeH;

    // w = 16;
    // h = 16;

    sprite.tilePosition.x %= w * sprite.tileScaleOffset.x;
    sprite.tilePosition.y %= h * sprite.tileScaleOffset.y;

    var offsetX = sprite.tilePosition.x / (w * sprite.tileScaleOffset.x);
    var offsetY = sprite.tilePosition.y / (h * sprite.tileScaleOffset.y);

    var scaleX = (sprite.width / w) / (sprite.tileScale.x * sprite.tileScaleOffset.x);
    var scaleY = (sprite.height / h) / (sprite.tileScale.y * sprite.tileScaleOffset.y);

    uvs.x0 = 0 - offsetX;
    uvs.y0 = 0 - offsetY;

    uvs.x1 = (1 * scaleX) - offsetX;
    uvs.y1 = 0 - offsetY;

    uvs.x2 = (1 * scaleX) - offsetX;
    uvs.y2 = (1 * scaleY) - offsetY;

    uvs.x3 = 0 - offsetX;
    uvs.y3 = (1 * scaleY) - offsetY;

    //  Get the sprites current alpha and tint and combine them into a single color
    var tint = sprite.tint;
    var color = (tint >> 16) + (tint & 0xff00) + ((tint & 0xff) << 16) + (sprite.worldAlpha * 255 << 24);

    var positions = this.positions;
    var colors = this.colors;

    var width = sprite.width;
    var height = sprite.height;

    // TODO trim??
    var aX = sprite.anchor.x;
    var aY = sprite.anchor.y;
    var w0 = width * (1-aX);
    var w1 = width * -aX;

    var h0 = height * (1-aY);
    var h1 = height * -aY;

    var i = this.currentBatchSize * 4 * this.vertSize;

    var resolution = texture.baseTexture.resolution;

    var wt = sprite.worldTransform;

    var a = wt.a / resolution;
    var b = wt.b / resolution;
    var c = wt.c / resolution;
    var d = wt.d / resolution;
    var tx = wt.tx;
    var ty = wt.ty;

    // xy
    positions[i++] = a * w1 + c * h1 + tx;
    positions[i++] = d * h1 + b * w1 + ty;
    // uv
    positions[i++] = uvs.x0;
    positions[i++] = uvs.y0;
    // color
    colors[i++] = color;

    // xy
    positions[i++] = (a * w0 + c * h1 + tx);
    positions[i++] = d * h1 + b * w0 + ty;
    // uv
    positions[i++] = uvs.x1;
    positions[i++] = uvs.y1;
    // color
    colors[i++] = color;
    
    // xy
    positions[i++] = a * w0 + c * h0 + tx;
    positions[i++] = d * h0 + b * w0 + ty;
    // uv
    positions[i++] = uvs.x2;
    positions[i++] = uvs.y2;
    // color
    colors[i++] = color;

    // xy
    positions[i++] = a * w1 + c * h0 + tx;
    positions[i++] = d * h0 + b * w1 + ty;
    // uv
    positions[i++] = uvs.x3;
    positions[i++] = uvs.y3;
    // color
    colors[i++] = color;

    // increment the batchsize
    this.sprites[this.currentBatchSize++] = sprite;
};

/**
* Renders the content and empties the current batch.
*
* @method flush
*/
PIXI.WebGLSpriteBatch.prototype.flush = function()
{
    // If the batch is length 0 then return as there is nothing to draw
    if (this.currentBatchSize === 0)
    {
        return;
    }

    var gl = this.gl;
    var shader;

    if (this.dirty)
    {
        this.dirty = false;

        // bind the main texture
        gl.activeTexture(gl.TEXTURE0);

        // bind the buffers
        gl.bindBuffer(gl.ARRAY_BUFFER, this.vertexBuffer);
        gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this.indexBuffer);

        shader = this.defaultShader.shaders[gl.id];

        // this is the same for each shader?
        var stride = this.vertSize * 4;
        gl.vertexAttribPointer(shader.aVertexPosition, 2, gl.FLOAT, false, stride, 0);
        gl.vertexAttribPointer(shader.aTextureCoord, 2, gl.FLOAT, false, stride, 2 * 4);

        // color attributes will be interpreted as unsigned bytes and normalized
        gl.vertexAttribPointer(shader.colorAttribute, 4, gl.UNSIGNED_BYTE, true, stride, 4 * 4);
    }

    // upload the verts to the buffer  
    if (this.currentBatchSize > (this.size * 0.5))
    {
        gl.bufferSubData(gl.ARRAY_BUFFER, 0, this.vertices);
    }
    else
    {
        var view = this.positions.subarray(0, this.currentBatchSize * 4 * this.vertSize);
        gl.bufferSubData(gl.ARRAY_BUFFER, 0, view);
    }

    var nextTexture, nextBlendMode, nextShader;
    var batchSize = 0;
    var start = 0;

    var currentBaseTexture = null;
    var currentBlendMode = this.renderSession.blendModeManager.currentBlendMode;
    var currentShader = null;

    var blendSwap = false;
    var shaderSwap = false;
    var sprite;

    for (var i = 0, j = this.currentBatchSize; i < j; i++) {
        
        sprite = this.sprites[i];

        if (sprite.tilingTexture)
        {
            nextTexture = sprite.tilingTexture.baseTexture;
        }
        else
        {
            nextTexture = sprite.texture.baseTexture;
        }

        nextBlendMode = sprite.blendMode;
        nextShader = sprite.shader || this.defaultShader;

        blendSwap = currentBlendMode !== nextBlendMode;
        shaderSwap = currentShader !== nextShader; // should I use _UIDS???

        var skip = nextTexture.skipRender;

        if (skip && sprite.children.length > 0)
        {
            skip = false;
        }

        if ((currentBaseTexture !== nextTexture && !skip) || blendSwap || shaderSwap)
        {
            this.renderBatch(currentBaseTexture, batchSize, start);

            start = i;
            batchSize = 0;
            currentBaseTexture = nextTexture;

            if (blendSwap)
            {
                currentBlendMode = nextBlendMode;
                this.renderSession.blendModeManager.setBlendMode(currentBlendMode);
            }

            if (shaderSwap)
            {
                currentShader = nextShader;
                
                shader = currentShader.shaders[gl.id];

                if (!shader)
                {
                    shader = new PIXI.PixiShader(gl);

                    shader.fragmentSrc = currentShader.fragmentSrc;
                    shader.uniforms = currentShader.uniforms;
                    shader.init();

                    currentShader.shaders[gl.id] = shader;
                }

                // set shader function???
                this.renderSession.shaderManager.setShader(shader);

                if (shader.dirty)
                {
                    shader.syncUniforms();
                }
                
                // both these only need to be set if they are changing..
                // set the projection
                var projection = this.renderSession.projection;
                gl.uniform2f(shader.projectionVector, projection.x, projection.y);

                // TODO - this is temporary!
                var offsetVector = this.renderSession.offset;
                gl.uniform2f(shader.offsetVector, offsetVector.x, offsetVector.y);

                // set the pointers
            }
        }

        batchSize++;
    }

    this.renderBatch(currentBaseTexture, batchSize, start);

    // then reset the batch!
    this.currentBatchSize = 0;
};

/**
* @method renderBatch
* @param texture {Texture}
* @param size {Number}
* @param startIndex {Number}
*/
PIXI.WebGLSpriteBatch.prototype.renderBatch = function(texture, size, startIndex)
{
    if (size === 0)
    {
        return;
    }

    var gl = this.gl;

    // check if a texture is dirty..
    if (texture._dirty[gl.id])
    {
        if (!this.renderSession.renderer.updateTexture(texture))
        {
            //  If updateTexture returns false then we cannot render it, so bail out now
            return;
        }
    }
    else
    {
        // bind the current texture
        gl.bindTexture(gl.TEXTURE_2D, texture._glTextures[gl.id]);
    }

    // now draw those suckas!
    gl.drawElements(gl.TRIANGLES, size * 6, gl.UNSIGNED_SHORT, startIndex * 6 * 2);
    
    // increment the draw count
    this.renderSession.drawCount++;
};

/**
* @method stop
*/
PIXI.WebGLSpriteBatch.prototype.stop = function()
{
    this.flush();
    this.dirty = true;
};

/**
* @method start
*/
PIXI.WebGLSpriteBatch.prototype.start = function()
{
    this.dirty = true;
};

/**
* Destroys the SpriteBatch.
* 
* @method destroy
*/
PIXI.WebGLSpriteBatch.prototype.destroy = function()
{
    this.vertices = null;
    this.indices = null;
    
    this.gl.deleteBuffer(this.vertexBuffer);
    this.gl.deleteBuffer(this.indexBuffer);
    
    this.currentBaseTexture = null;
    
    this.gl = null;
};
/**
 * @author Mat Groves
 * 
 * Big thanks to the very clever Matt DesLauriers <mattdesl> https://github.com/mattdesl/
 * for creating the original pixi version!
 *
 * Heavily inspired by LibGDX's WebGLSpriteBatch:
 * https://github.com/libgdx/libgdx/blob/master/gdx/src/com/badlogic/gdx/graphics/g2d/WebGLSpriteBatch.java
 */

/**
* @class WebGLFastSpriteBatch
* @constructor
*/
PIXI.WebGLFastSpriteBatch = function(gl)
{
    /**
     * @property vertSize
     * @type Number
     */
    this.vertSize = 10;

    /**
     * @property maxSize
     * @type Number
     */
    this.maxSize = 6000;//Math.pow(2, 16) /  this.vertSize;

    /**
     * @property size
     * @type Number
     */
    this.size = this.maxSize;

    //the total number of floats in our batch
    var numVerts = this.size * 4 *  this.vertSize;

    //the total number of indices in our batch
    var numIndices = this.maxSize * 6;

    /**
     * Vertex data
     * @property vertices
     * @type Float32Array
     */
    this.vertices = new PIXI.Float32Array(numVerts);

    /**
     * Index data
     * @property indices
     * @type Uint16Array
     */
    this.indices = new PIXI.Uint16Array(numIndices);
    
    /**
     * @property vertexBuffer
     * @type Object
     */
    this.vertexBuffer = null;

    /**
     * @property indexBuffer
     * @type Object
     */
    this.indexBuffer = null;

    /**
     * @property lastIndexCount
     * @type Number
     */
    this.lastIndexCount = 0;

    for (var i=0, j=0; i < numIndices; i += 6, j += 4)
    {
        this.indices[i + 0] = j + 0;
        this.indices[i + 1] = j + 1;
        this.indices[i + 2] = j + 2;
        this.indices[i + 3] = j + 0;
        this.indices[i + 4] = j + 2;
        this.indices[i + 5] = j + 3;
    }

    /**
     * @property drawing
     * @type Boolean
     */
    this.drawing = false;

    /**
     * @property currentBatchSize
     * @type Number
     */
    this.currentBatchSize = 0;

    /**
     * @property currentBaseTexture
     * @type BaseTexture
     */
    this.currentBaseTexture = null;
   
    /**
     * @property currentBlendMode
     * @type Number
     */
    this.currentBlendMode = 0;

    /**
     * @property renderSession
     * @type Object
     */
    this.renderSession = null;
    
    /**
     * @property shader
     * @type Object
     */
    this.shader = null;

    /**
     * @property matrix
     * @type Matrix
     */
    this.matrix = null;

    this.setContext(gl);
};

PIXI.WebGLFastSpriteBatch.prototype.constructor = PIXI.WebGLFastSpriteBatch;

/**
 * Sets the WebGL Context.
 *
 * @method setContext
 * @param gl {WebGLContext} the current WebGL drawing context
 */
PIXI.WebGLFastSpriteBatch.prototype.setContext = function(gl)
{
    this.gl = gl;

    // create a couple of buffers
    this.vertexBuffer = gl.createBuffer();
    this.indexBuffer = gl.createBuffer();

    // 65535 is max index, so 65535 / 6 = 10922.

    //upload the index data
    gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this.indexBuffer);
    gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, this.indices, gl.STATIC_DRAW);

    gl.bindBuffer(gl.ARRAY_BUFFER, this.vertexBuffer);
    gl.bufferData(gl.ARRAY_BUFFER, this.vertices, gl.DYNAMIC_DRAW);
};

/**
 * @method begin
 * @param spriteBatch {WebGLSpriteBatch}
 * @param renderSession {Object}
 */
PIXI.WebGLFastSpriteBatch.prototype.begin = function(spriteBatch, renderSession)
{
    this.renderSession = renderSession;
    this.shader = this.renderSession.shaderManager.fastShader;

    this.matrix = spriteBatch.worldTransform.toArray(true);

    this.start();
};

/**
 * @method end
 */
PIXI.WebGLFastSpriteBatch.prototype.end = function()
{
    this.flush();
};

/**
 * @method render
 * @param spriteBatch {WebGLSpriteBatch}
 */
PIXI.WebGLFastSpriteBatch.prototype.render = function(spriteBatch)
{
    var children = spriteBatch.children;
    var sprite = children[0];

    // if the uvs have not updated then no point rendering just yet!
    
    // check texture.
    if(!sprite.texture._uvs)return;
   
    this.currentBaseTexture = sprite.texture.baseTexture;
    
    // check blend mode
    if(sprite.blendMode !== this.renderSession.blendModeManager.currentBlendMode)
    {
        this.flush();
        this.renderSession.blendModeManager.setBlendMode(sprite.blendMode);
    }
    
    for(var i=0,j= children.length; i<j; i++)
    {
        this.renderSprite(children[i]);
    }

    this.flush();
};

/**
 * @method renderSprite
 * @param sprite {Sprite}
 */
PIXI.WebGLFastSpriteBatch.prototype.renderSprite = function(sprite)
{
    //sprite = children[i];
    if(!sprite.visible)return;
    
    // TODO trim??
    if(sprite.texture.baseTexture !== this.currentBaseTexture && !sprite.texture.baseTexture.skipRender)
    {
        this.flush();
        this.currentBaseTexture = sprite.texture.baseTexture;
        
        if(!sprite.texture._uvs)return;
    }

    var uvs, vertices = this.vertices, width, height, w0, w1, h0, h1, index;

    uvs = sprite.texture._uvs;

    width = sprite.texture.frame.width;
    height = sprite.texture.frame.height;

    if (sprite.texture.trim)
    {
        // if the sprite is trimmed then we need to add the extra space before transforming the sprite coords..
        var trim = sprite.texture.trim;

        w1 = trim.x - sprite.anchor.x * trim.width;
        w0 = w1 + sprite.texture.crop.width;

        h1 = trim.y - sprite.anchor.y * trim.height;
        h0 = h1 + sprite.texture.crop.height;
    }
    else
    {
        w0 = (sprite.texture.frame.width ) * (1-sprite.anchor.x);
        w1 = (sprite.texture.frame.width ) * -sprite.anchor.x;

        h0 = sprite.texture.frame.height * (1-sprite.anchor.y);
        h1 = sprite.texture.frame.height * -sprite.anchor.y;
    }

    index = this.currentBatchSize * 4 * this.vertSize;

    // xy
    vertices[index++] = w1;
    vertices[index++] = h1;

    vertices[index++] = sprite.position.x;
    vertices[index++] = sprite.position.y;

    //scale
    vertices[index++] = sprite.scale.x;
    vertices[index++] = sprite.scale.y;

    //rotation
    vertices[index++] = sprite.rotation;

    // uv
    vertices[index++] = uvs.x0;
    vertices[index++] = uvs.y1;
    // color
    vertices[index++] = sprite.alpha;
 

    // xy
    vertices[index++] = w0;
    vertices[index++] = h1;

    vertices[index++] = sprite.position.x;
    vertices[index++] = sprite.position.y;

    //scale
    vertices[index++] = sprite.scale.x;
    vertices[index++] = sprite.scale.y;

     //rotation
    vertices[index++] = sprite.rotation;

    // uv
    vertices[index++] = uvs.x1;
    vertices[index++] = uvs.y1;
    // color
    vertices[index++] = sprite.alpha;
  

    // xy
    vertices[index++] = w0;
    vertices[index++] = h0;

    vertices[index++] = sprite.position.x;
    vertices[index++] = sprite.position.y;

    //scale
    vertices[index++] = sprite.scale.x;
    vertices[index++] = sprite.scale.y;

     //rotation
    vertices[index++] = sprite.rotation;

    // uv
    vertices[index++] = uvs.x2;
    vertices[index++] = uvs.y2;
    // color
    vertices[index++] = sprite.alpha;
 



    // xy
    vertices[index++] = w1;
    vertices[index++] = h0;

    vertices[index++] = sprite.position.x;
    vertices[index++] = sprite.position.y;

    //scale
    vertices[index++] = sprite.scale.x;
    vertices[index++] = sprite.scale.y;

     //rotation
    vertices[index++] = sprite.rotation;

    // uv
    vertices[index++] = uvs.x3;
    vertices[index++] = uvs.y3;
    // color
    vertices[index++] = sprite.alpha;

    // increment the batchs
    this.currentBatchSize++;

    if(this.currentBatchSize >= this.size)
    {
        this.flush();
    }
};

/**
 * @method flush
 */
PIXI.WebGLFastSpriteBatch.prototype.flush = function()
{
    // If the batch is length 0 then return as there is nothing to draw
    if (this.currentBatchSize===0)return;

    var gl = this.gl;
    
    // bind the current texture

    if(!this.currentBaseTexture._glTextures[gl.id])this.renderSession.renderer.updateTexture(this.currentBaseTexture, gl);

    gl.bindTexture(gl.TEXTURE_2D, this.currentBaseTexture._glTextures[gl.id]);

    // upload the verts to the buffer
   
    if(this.currentBatchSize > ( this.size * 0.5 ) )
    {
        gl.bufferSubData(gl.ARRAY_BUFFER, 0, this.vertices);
    }
    else
    {
        var view = this.vertices.subarray(0, this.currentBatchSize * 4 * this.vertSize);

        gl.bufferSubData(gl.ARRAY_BUFFER, 0, view);
    }
    
    // now draw those suckas!
    gl.drawElements(gl.TRIANGLES, this.currentBatchSize * 6, gl.UNSIGNED_SHORT, 0);
   
    // then reset the batch!
    this.currentBatchSize = 0;

    // increment the draw count
    this.renderSession.drawCount++;
};


/**
 * @method stop
 */
PIXI.WebGLFastSpriteBatch.prototype.stop = function()
{
    this.flush();
};

/**
 * @method start
 */
PIXI.WebGLFastSpriteBatch.prototype.start = function()
{
    var gl = this.gl;

    // bind the main texture
    gl.activeTexture(gl.TEXTURE0);

    // bind the buffers
    gl.bindBuffer(gl.ARRAY_BUFFER, this.vertexBuffer);
    gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this.indexBuffer);

    // set the projection
    var projection = this.renderSession.projection;
    gl.uniform2f(this.shader.projectionVector, projection.x, projection.y);

    // set the matrix
    gl.uniformMatrix3fv(this.shader.uMatrix, false, this.matrix);

    // set the pointers
    var stride =  this.vertSize * 4;

    gl.vertexAttribPointer(this.shader.aVertexPosition, 2, gl.FLOAT, false, stride, 0);
    gl.vertexAttribPointer(this.shader.aPositionCoord, 2, gl.FLOAT, false, stride, 2 * 4);
    gl.vertexAttribPointer(this.shader.aScale, 2, gl.FLOAT, false, stride, 4 * 4);
    gl.vertexAttribPointer(this.shader.aRotation, 1, gl.FLOAT, false, stride, 6 * 4);
    gl.vertexAttribPointer(this.shader.aTextureCoord, 2, gl.FLOAT, false, stride, 7 * 4);
    gl.vertexAttribPointer(this.shader.colorAttribute, 1, gl.FLOAT, false, stride, 9 * 4);
    
};

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

/**
* @class WebGLFilterManager
* @constructor
*/
PIXI.WebGLFilterManager = function()
{
    /**
     * @property filterStack
     * @type Array
     */
    this.filterStack = [];
    
    /**
     * @property offsetX
     * @type Number
     */
    this.offsetX = 0;

    /**
     * @property offsetY
     * @type Number
     */
    this.offsetY = 0;
};

PIXI.WebGLFilterManager.prototype.constructor = PIXI.WebGLFilterManager;

/**
* Initialises the context and the properties.
* 
* @method setContext 
* @param gl {WebGLContext} the current WebGL drawing context
*/
PIXI.WebGLFilterManager.prototype.setContext = function(gl)
{
    this.gl = gl;
    this.texturePool = [];

    this.initShaderBuffers();
};

/**
* @method begin
* @param renderSession {RenderSession} 
* @param buffer {ArrayBuffer} 
*/
PIXI.WebGLFilterManager.prototype.begin = function(renderSession, buffer)
{
    this.renderSession = renderSession;
    this.defaultShader = renderSession.shaderManager.defaultShader;

    var projection = this.renderSession.projection;
    this.width = projection.x * 2;
    this.height = -projection.y * 2;
    this.buffer = buffer;
};

/**
* Applies the filter and adds it to the current filter stack.
* 
* @method pushFilter
* @param filterBlock {Object} the filter that will be pushed to the current filter stack
*/
PIXI.WebGLFilterManager.prototype.pushFilter = function(filterBlock)
{
    var gl = this.gl;

    var projection = this.renderSession.projection;
    var offset = this.renderSession.offset;

    filterBlock._filterArea = filterBlock.target.filterArea || filterBlock.target.getBounds();
    
    // >>> modify by nextht
    filterBlock._previous_stencil_mgr = this.renderSession.stencilManager;
    this.renderSession.stencilManager = new PIXI.WebGLStencilManager();
    this.renderSession.stencilManager.setContext(gl);
    gl.disable(gl.STENCIL_TEST);
    // <<<  modify by nextht 
   
    // filter program
    // OPTIMISATION - the first filter is free if its a simple color change?
    this.filterStack.push(filterBlock);

    var filter = filterBlock.filterPasses[0];

    this.offsetX += filterBlock._filterArea.x;
    this.offsetY += filterBlock._filterArea.y;

    var texture = this.texturePool.pop();
    if(!texture)
    {
        texture = new PIXI.FilterTexture(this.gl, this.width * this.renderSession.resolution, this.height * this.renderSession.resolution);
    }
    else
    {
        texture.resize(this.width * this.renderSession.resolution, this.height * this.renderSession.resolution);
    }

    gl.bindTexture(gl.TEXTURE_2D,  texture.texture);

    var filterArea = filterBlock._filterArea;// filterBlock.target.getBounds();///filterBlock.target.filterArea;

    var padding = filter.padding;
    filterArea.x -= padding;
    filterArea.y -= padding;
    filterArea.width += padding * 2;
    filterArea.height += padding * 2;

    // cap filter to screen size..
    if(filterArea.x < 0)filterArea.x = 0;
    if(filterArea.width > this.width)filterArea.width = this.width;
    if(filterArea.y < 0)filterArea.y = 0;
    if(filterArea.height > this.height)filterArea.height = this.height;

    //gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA,  filterArea.width, filterArea.height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
    gl.bindFramebuffer(gl.FRAMEBUFFER, texture.frameBuffer);

    // set view port
    gl.viewport(0, 0, filterArea.width * this.renderSession.resolution, filterArea.height * this.renderSession.resolution);

    projection.x = filterArea.width/2;
    projection.y = -filterArea.height/2;

    offset.x = -filterArea.x;
    offset.y = -filterArea.y;

    // update projection
    // now restore the regular shader..
    // this.renderSession.shaderManager.setShader(this.defaultShader);
    //gl.uniform2f(this.defaultShader.projectionVector, filterArea.width/2, -filterArea.height/2);
    //gl.uniform2f(this.defaultShader.offsetVector, -filterArea.x, -filterArea.y);

    gl.colorMask(true, true, true, true);
    gl.clearColor(0,0,0, 0);
    gl.clear(gl.COLOR_BUFFER_BIT);

    filterBlock._glFilterTexture = texture;

};

/**
* Removes the last filter from the filter stack and doesn't return it.
* 
* @method popFilter
*/
PIXI.WebGLFilterManager.prototype.popFilter = function()
{
    var gl = this.gl;
    var filterBlock = this.filterStack.pop();
    var filterArea = filterBlock._filterArea;
    var texture = filterBlock._glFilterTexture;
    var projection = this.renderSession.projection;
    var offset = this.renderSession.offset;

    if(filterBlock.filterPasses.length > 1)
    {
        gl.viewport(0, 0, filterArea.width * this.renderSession.resolution, filterArea.height * this.renderSession.resolution);

        gl.bindBuffer(gl.ARRAY_BUFFER, this.vertexBuffer);

        this.vertexArray[0] = 0;
        this.vertexArray[1] = filterArea.height;

        this.vertexArray[2] = filterArea.width;
        this.vertexArray[3] = filterArea.height;

        this.vertexArray[4] = 0;
        this.vertexArray[5] = 0;

        this.vertexArray[6] = filterArea.width;
        this.vertexArray[7] = 0;

        gl.bufferSubData(gl.ARRAY_BUFFER, 0, this.vertexArray);

        gl.bindBuffer(gl.ARRAY_BUFFER, this.uvBuffer);
        // now set the uvs..
        this.uvArray[2] = filterArea.width/this.width;
        this.uvArray[5] = filterArea.height/this.height;
        this.uvArray[6] = filterArea.width/this.width;
        this.uvArray[7] = filterArea.height/this.height;

        gl.bufferSubData(gl.ARRAY_BUFFER, 0, this.uvArray);

        var inputTexture = texture;
        var outputTexture = this.texturePool.pop();
        if(!outputTexture)outputTexture = new PIXI.FilterTexture(this.gl, this.width * this.renderSession.resolution, this.height * this.renderSession.resolution);
        outputTexture.resize(this.width * this.renderSession.resolution, this.height * this.renderSession.resolution);

        // need to clear this FBO as it may have some left over elements from a previous filter.
        gl.bindFramebuffer(gl.FRAMEBUFFER, outputTexture.frameBuffer );
        gl.clear(gl.COLOR_BUFFER_BIT);

        gl.disable(gl.BLEND);

        for (var i = 0; i < filterBlock.filterPasses.length-1; i++)
        {
            var filterPass = filterBlock.filterPasses[i];

            gl.bindFramebuffer(gl.FRAMEBUFFER, outputTexture.frameBuffer );

            // set texture
            gl.activeTexture(gl.TEXTURE0);
            gl.bindTexture(gl.TEXTURE_2D, inputTexture.texture);

            // draw texture..
            //filterPass.applyFilterPass(filterArea.width, filterArea.height);
            this.applyFilterPass(filterPass, filterArea, filterArea.width, filterArea.height);

            // swap the textures..
            var temp = inputTexture;
            inputTexture = outputTexture;
            outputTexture = temp;
        }

        gl.enable(gl.BLEND);

        texture = inputTexture;
        this.texturePool.push(outputTexture);
    }

    var filter = filterBlock.filterPasses[filterBlock.filterPasses.length-1];

    this.offsetX -= filterArea.x;
    this.offsetY -= filterArea.y;

    var sizeX = this.width;
    var sizeY = this.height;

    var offsetX = 0;
    var offsetY = 0;

    var buffer = this.buffer;

    // time to render the filters texture to the previous scene
    if(this.filterStack.length === 0)
    {
        gl.colorMask(true, true, true, true);//this.transparent);
    }
    else
    {
        var currentFilter = this.filterStack[this.filterStack.length-1];
        filterArea = currentFilter._filterArea;

        sizeX = filterArea.width;
        sizeY = filterArea.height;

        offsetX = filterArea.x;
        offsetY = filterArea.y;

        buffer =  currentFilter._glFilterTexture.frameBuffer;
    }

    // TODO need to remove these global elements..
    projection.x = sizeX/2;
    projection.y = -sizeY/2;

    offset.x = offsetX;
    offset.y = offsetY;

    filterArea = filterBlock._filterArea;

    var x = filterArea.x-offsetX;
    var y = filterArea.y-offsetY;

    // update the buffers..
    // make sure to flip the y!
    gl.bindBuffer(gl.ARRAY_BUFFER, this.vertexBuffer);

    this.vertexArray[0] = x;
    this.vertexArray[1] = y + filterArea.height;

    this.vertexArray[2] = x + filterArea.width;
    this.vertexArray[3] = y + filterArea.height;

    this.vertexArray[4] = x;
    this.vertexArray[5] = y;

    this.vertexArray[6] = x + filterArea.width;
    this.vertexArray[7] = y;

    gl.bufferSubData(gl.ARRAY_BUFFER, 0, this.vertexArray);

    gl.bindBuffer(gl.ARRAY_BUFFER, this.uvBuffer);

    this.uvArray[2] = filterArea.width/this.width;
    this.uvArray[5] = filterArea.height/this.height;
    this.uvArray[6] = filterArea.width/this.width;
    this.uvArray[7] = filterArea.height/this.height;

    gl.bufferSubData(gl.ARRAY_BUFFER, 0, this.uvArray);

    gl.viewport(0, 0, sizeX * this.renderSession.resolution, sizeY * this.renderSession.resolution);

    // bind the buffer
    gl.bindFramebuffer(gl.FRAMEBUFFER, buffer );

    // set the blend mode! 
    //gl.blendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA)

    // set texture
    gl.activeTexture(gl.TEXTURE0);
    gl.bindTexture(gl.TEXTURE_2D, texture.texture);

    // >>> modify by nextht
    if (this.renderSession.stencilManager) {
        this.renderSession.stencilManager.destroy();
    }
    this.renderSession.stencilManager = filterBlock._previous_stencil_mgr;
    filterBlock._previous_stencil_mgr = null;
    if (this.renderSession.stencilManager.count > 0) {
        gl.enable(gl.STENCIL_TEST);
    }
    else {
        gl.disable(gl.STENCIL_TEST);
    }    
    // <<< modify by nextht

    // apply!
    this.applyFilterPass(filter, filterArea, sizeX, sizeY);

    // now restore the regular shader.. should happen automatically now..
    // this.renderSession.shaderManager.setShader(this.defaultShader);
    // gl.uniform2f(this.defaultShader.projectionVector, sizeX/2, -sizeY/2);
    // gl.uniform2f(this.defaultShader.offsetVector, -offsetX, -offsetY);

    // return the texture to the pool
    this.texturePool.push(texture);
    filterBlock._glFilterTexture = null;
};


/**
* Applies the filter to the specified area.
* 
* @method applyFilterPass
* @param filter {AbstractFilter} the filter that needs to be applied
* @param filterArea {Texture} TODO - might need an update
* @param width {Number} the horizontal range of the filter
* @param height {Number} the vertical range of the filter
*/
PIXI.WebGLFilterManager.prototype.applyFilterPass = function(filter, filterArea, width, height)
{
    // use program
    var gl = this.gl;
    var shader = filter.shaders[gl.id];

    if(!shader)
    {
        shader = new PIXI.PixiShader(gl);

        shader.fragmentSrc = filter.fragmentSrc;
        shader.uniforms = filter.uniforms;
        shader.init();

        filter.shaders[gl.id] = shader;
    }

    // set the shader
    this.renderSession.shaderManager.setShader(shader);

//    gl.useProgram(shader.program);

    gl.uniform2f(shader.projectionVector, width/2, -height/2);
    gl.uniform2f(shader.offsetVector, 0,0);

    if(filter.uniforms.dimensions)
    {
        filter.uniforms.dimensions.value[0] = this.width;//width;
        filter.uniforms.dimensions.value[1] = this.height;//height;
        filter.uniforms.dimensions.value[2] = this.vertexArray[0];
        filter.uniforms.dimensions.value[3] = this.vertexArray[5];//filterArea.height;
    }

    shader.syncUniforms();

    gl.bindBuffer(gl.ARRAY_BUFFER, this.vertexBuffer);
    gl.vertexAttribPointer(shader.aVertexPosition, 2, gl.FLOAT, false, 0, 0);

    gl.bindBuffer(gl.ARRAY_BUFFER, this.uvBuffer);
    gl.vertexAttribPointer(shader.aTextureCoord, 2, gl.FLOAT, false, 0, 0);

    gl.bindBuffer(gl.ARRAY_BUFFER, this.colorBuffer);
    gl.vertexAttribPointer(shader.colorAttribute, 2, gl.FLOAT, false, 0, 0);

    gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this.indexBuffer);

    // draw the filter...
    gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_SHORT, 0 );

    this.renderSession.drawCount++;
};

/**
* Initialises the shader buffers.
* 
* @method initShaderBuffers
*/
PIXI.WebGLFilterManager.prototype.initShaderBuffers = function()
{
    var gl = this.gl;

    // create some buffers
    this.vertexBuffer = gl.createBuffer();
    this.uvBuffer = gl.createBuffer();
    this.colorBuffer = gl.createBuffer();
    this.indexBuffer = gl.createBuffer();

    // bind and upload the vertexs..
    // keep a reference to the vertexFloatData..
    this.vertexArray = new PIXI.Float32Array([0.0, 0.0,
                                         1.0, 0.0,
                                         0.0, 1.0,
                                         1.0, 1.0]);

    gl.bindBuffer(gl.ARRAY_BUFFER, this.vertexBuffer);
    gl.bufferData(gl.ARRAY_BUFFER, this.vertexArray, gl.STATIC_DRAW);

    // bind and upload the uv buffer
    this.uvArray = new PIXI.Float32Array([0.0, 0.0,
                                     1.0, 0.0,
                                     0.0, 1.0,
                                     1.0, 1.0]);

    gl.bindBuffer(gl.ARRAY_BUFFER, this.uvBuffer);
    gl.bufferData(gl.ARRAY_BUFFER, this.uvArray, gl.STATIC_DRAW);

    this.colorArray = new PIXI.Float32Array([1.0, 0xFFFFFF,
                                        1.0, 0xFFFFFF,
                                        1.0, 0xFFFFFF,
                                        1.0, 0xFFFFFF]);

    gl.bindBuffer(gl.ARRAY_BUFFER, this.colorBuffer);
    gl.bufferData(gl.ARRAY_BUFFER, this.colorArray, gl.STATIC_DRAW);

    // bind and upload the index
    gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this.indexBuffer);
    gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array([0, 1, 2, 1, 3, 2]), gl.STATIC_DRAW);

};

/**
* Destroys the filter and removes it from the filter stack.
* 
* @method destroy
*/
PIXI.WebGLFilterManager.prototype.destroy = function()
{
    var gl = this.gl;

    this.filterStack = null;
    
    this.offsetX = 0;
    this.offsetY = 0;

    // destroy textures
    for (var i = 0; i < this.texturePool.length; i++) {
        this.texturePool[i].destroy();
    }
    
    this.texturePool = null;

    //destroy buffers..
    gl.deleteBuffer(this.vertexBuffer);
    gl.deleteBuffer(this.uvBuffer);
    gl.deleteBuffer(this.colorBuffer);
    gl.deleteBuffer(this.indexBuffer);
};

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

/**
* @class FilterTexture
* @constructor
* @param gl {WebGLContext} the current WebGL drawing context
* @param width {Number} the horizontal range of the filter
* @param height {Number} the vertical range of the filter
* @param scaleMode {Number} See {{#crossLink "PIXI/scaleModes:property"}}PIXI.scaleModes{{/crossLink}} for possible values
*/
PIXI.FilterTexture = function(gl, width, height, scaleMode)
{
    /**
     * @property gl
     * @type WebGLContext
     */
    this.gl = gl;

    // next time to create a frame buffer and texture

    /**
     * @property frameBuffer
     * @type Any
     */
    this.frameBuffer = gl.createFramebuffer();

    /**
     * @property texture
     * @type Any
     */
    this.texture = gl.createTexture();

    /**
     * @property scaleMode
     * @type Number
     */
    scaleMode = scaleMode || PIXI.scaleModes.DEFAULT;

    gl.bindTexture(gl.TEXTURE_2D,  this.texture);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, scaleMode === PIXI.scaleModes.LINEAR ? gl.LINEAR : gl.NEAREST);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, scaleMode === PIXI.scaleModes.LINEAR ? gl.LINEAR : gl.NEAREST);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
    gl.bindFramebuffer(gl.FRAMEBUFFER, this.frameBuffer );

    gl.bindFramebuffer(gl.FRAMEBUFFER, this.frameBuffer );
    gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, this.texture, 0);

    // required for masking a mask??
    this.renderBuffer = gl.createRenderbuffer();
    gl.bindRenderbuffer(gl.RENDERBUFFER, this.renderBuffer);
    gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_STENCIL_ATTACHMENT, gl.RENDERBUFFER, this.renderBuffer);
  
    this.resize(width, height);
};

PIXI.FilterTexture.prototype.constructor = PIXI.FilterTexture;

/**
* Clears the filter texture.
* 
* @method clear
*/
PIXI.FilterTexture.prototype.clear = function()
{
    var gl = this.gl;
    
    gl.clearColor(0,0,0, 0);
    gl.clear(gl.COLOR_BUFFER_BIT);
};

/**
 * Resizes the texture to the specified width and height
 *
 * @method resize
 * @param width {Number} the new width of the texture
 * @param height {Number} the new height of the texture
 */
PIXI.FilterTexture.prototype.resize = function(width, height)
{
    if(this.width === width && this.height === height) return;

    this.width = width;
    this.height = height;

    var gl = this.gl;

    gl.bindTexture(gl.TEXTURE_2D,  this.texture);
    gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA,  width , height , 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
    // update the stencil buffer width and height
    gl.bindRenderbuffer(gl.RENDERBUFFER, this.renderBuffer);
    gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_STENCIL, width , height );
};

/**
* Destroys the filter texture.
* 
* @method destroy
*/
PIXI.FilterTexture.prototype.destroy = function()
{
    var gl = this.gl;
    gl.deleteFramebuffer( this.frameBuffer );
    gl.deleteTexture( this.texture );

    this.frameBuffer = null;
    this.texture = null;
};

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

/**
 * Creates a Canvas element of the given size.
 *
 * @class CanvasBuffer
 * @constructor
 * @param width {Number} the width for the newly created canvas
 * @param height {Number} the height for the newly created canvas
 */
PIXI.CanvasBuffer = function(width, height)
{
    /**
     * The width of the Canvas in pixels.
     *
     * @property width
     * @type Number
     */
    this.width = width;

    /**
     * The height of the Canvas in pixels.
     *
     * @property height
     * @type Number
     */
    this.height = height;

    /**
     * The Canvas object that belongs to this CanvasBuffer.
     *
     * @property canvas
     * @type HTMLCanvasElement
     */
    this.canvas = PIXI.CanvasPool.create(this, this.width, this.height);

    /**
     * A CanvasRenderingContext2D object representing a two-dimensional rendering context.
     *
     * @property context
     * @type CanvasRenderingContext2D
     */
    this.context = this.canvas.getContext("2d");

    this.canvas.width = width;
    this.canvas.height = height;
};

PIXI.CanvasBuffer.prototype.constructor = PIXI.CanvasBuffer;

/**
 * Clears the canvas that was created by the CanvasBuffer class.
 *
 * @method clear
 * @private
 */
PIXI.CanvasBuffer.prototype.clear = function()
{
    this.context.setTransform(1, 0, 0, 1, 0, 0);
    this.context.clearRect(0,0, this.width, this.height);
};

/**
 * Resizes the canvas to the specified width and height.
 *
 * @method resize
 * @param width {Number} the new width of the canvas
 * @param height {Number} the new height of the canvas
 */
PIXI.CanvasBuffer.prototype.resize = function(width, height)
{
    this.width = this.canvas.width = width;
    this.height = this.canvas.height = height;
};

/**
 * Frees the canvas up for use again.
 *
 * @method destroy
 */
PIXI.CanvasBuffer.prototype.destroy = function()
{
    PIXI.CanvasPool.remove(this);
};

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

/**
 * A set of functions used to handle masking.
 *
 * @class CanvasMaskManager
 * @constructor
 */
PIXI.CanvasMaskManager = function()
{
};

PIXI.CanvasMaskManager.prototype.constructor = PIXI.CanvasMaskManager;

/**
 * This method adds it to the current stack of masks.
 *
 * @method pushMask
 * @param maskData {Object} the maskData that will be pushed
 * @param renderSession {Object} The renderSession whose context will be used for this mask manager.
 */
PIXI.CanvasMaskManager.prototype.pushMask = function(maskData, renderSession) {

	var context = renderSession.context;

    context.save();
    
    var cacheAlpha = maskData.alpha;
    var transform = maskData.worldTransform;

    var resolution = renderSession.resolution;

    context.setTransform(transform.a * resolution,
                         transform.b * resolution,
                         transform.c * resolution,
                         transform.d * resolution,
                         transform.tx * resolution,
                         transform.ty * resolution);

    PIXI.CanvasGraphics.renderGraphicsMask(maskData, context);

    context.clip();

    maskData.worldAlpha = cacheAlpha;
};

/**
 * Restores the current drawing context to the state it was before the mask was applied.
 *
 * @method popMask
 * @param renderSession {Object} The renderSession whose context will be used for this mask manager.
 */
PIXI.CanvasMaskManager.prototype.popMask = function(renderSession)
{
    renderSession.context.restore();
};

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

/**
 * Utility methods for Sprite/Texture tinting.
 *
 * @class CanvasTinter
 * @static
 */
PIXI.CanvasTinter = function() {};

/**
 * Basically this method just needs a sprite and a color and tints the sprite with the given color.
 * 
 * @method getTintedTexture 
 * @static
 * @param sprite {Sprite} the sprite to tint
 * @param color {Number} the color to use to tint the sprite with
 * @return {HTMLCanvasElement} The tinted canvas
 */
PIXI.CanvasTinter.getTintedTexture = function(sprite, color)
{
    var canvas = sprite.tintedTexture || PIXI.CanvasPool.create(this);
    
    PIXI.CanvasTinter.tintMethod(sprite.texture, color, canvas);

    return canvas;
};

/**
 * Tint a texture using the "multiply" operation.
 * 
 * @method tintWithMultiply
 * @static
 * @param texture {Texture} the texture to tint
 * @param color {Number} the color to use to tint the sprite with
 * @param canvas {HTMLCanvasElement} the current canvas
 */
PIXI.CanvasTinter.tintWithMultiply = function(texture, color, canvas)
{
    var context = canvas.getContext("2d");

    var crop = texture.crop;

    if (canvas.width !== crop.width || canvas.height !== crop.height)
    {
        canvas.width = crop.width;
        canvas.height = crop.height;
    }

    context.clearRect(0, 0, crop.width, crop.height);

    context.fillStyle = "#" + ("00000" + (color | 0).toString(16)).substr(-6);
    context.fillRect(0, 0, crop.width, crop.height);

    context.globalCompositeOperation = "multiply";
    context.drawImage(texture.baseTexture.source, crop.x, crop.y, crop.width, crop.height, 0, 0, crop.width, crop.height);

    context.globalCompositeOperation = "destination-atop";
    context.drawImage(texture.baseTexture.source, crop.x, crop.y, crop.width, crop.height, 0, 0, crop.width, crop.height);

};

/**
 * Tint a texture pixel per pixel.
 * 
 * @method tintPerPixel
 * @static
 * @param texture {Texture} the texture to tint
 * @param color {Number} the color to use to tint the sprite with
 * @param canvas {HTMLCanvasElement} the current canvas
 */ 
PIXI.CanvasTinter.tintWithPerPixel = function(texture, color, canvas)
{
    var context = canvas.getContext("2d");

    var crop = texture.crop;

    canvas.width = crop.width;
    canvas.height = crop.height;
  
    context.globalCompositeOperation = "copy";

    context.drawImage(texture.baseTexture.source, crop.x, crop.y, crop.width, crop.height, 0, 0, crop.width, crop.height);

    var rgbValues = PIXI.hex2rgb(color);
    var r = rgbValues[0], g = rgbValues[1], b = rgbValues[2];

    var pixelData = context.getImageData(0, 0, crop.width, crop.height);

    var pixels = pixelData.data;

    for (var i = 0; i < pixels.length; i += 4)
    {
        pixels[i + 0] *= r;
        pixels[i + 1] *= g;
        pixels[i + 2] *= b;

        if (!PIXI.CanvasTinter.canHandleAlpha)
        {
            var alpha = pixels[i + 3];

            pixels[i + 0] /= 255 / alpha;
            pixels[i + 1] /= 255 / alpha;
            pixels[i + 2] /= 255 / alpha;
        }
    }

    context.putImageData(pixelData, 0, 0);
};

/**
 * Checks if the browser correctly supports putImageData alpha channels.
 * 
 * @method checkInverseAlpha
 * @static
 */
PIXI.CanvasTinter.checkInverseAlpha = function()
{
    var canvas = new PIXI.CanvasBuffer(2, 1);

    canvas.context.fillStyle = "rgba(10, 20, 30, 0.5)";

    //  Draw a single pixel
    canvas.context.fillRect(0, 0, 1, 1);

    //  Get the color values
    var s1 = canvas.context.getImageData(0, 0, 1, 1);

    if (s1 === null)
    {
        return false;
    }

    //  Plot them to x2
    canvas.context.putImageData(s1, 1, 0);

    //  Get those values
    var s2 = canvas.context.getImageData(1, 0, 1, 1);

    //  Compare and return
    return (s2.data[0] === s1.data[0] && s2.data[1] === s1.data[1] && s2.data[2] === s1.data[2] && s2.data[3] === s1.data[3]);
};

/**
 * If the browser isn't capable of handling tinting with alpha this will be false.
 * This property is only applicable if using tintWithPerPixel.
 *
 * @property canHandleAlpha
 * @type Boolean
 * @static
 */
PIXI.CanvasTinter.canHandleAlpha = PIXI.CanvasTinter.checkInverseAlpha();

/**
 * Whether or not the Canvas BlendModes are supported, consequently the ability to tint using the multiply method.
 *
 * @property canUseMultiply
 * @type Boolean
 * @static
 */
PIXI.CanvasTinter.canUseMultiply = PIXI.canUseNewCanvasBlendModes();

/**
 * The tinting method that will be used.
 * 
 * @method tintMethod
 * @static
 */
PIXI.CanvasTinter.tintMethod = PIXI.CanvasTinter.canUseMultiply ? PIXI.CanvasTinter.tintWithMultiply :  PIXI.CanvasTinter.tintWithPerPixel;

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

/**
 * The CanvasRenderer draws the Stage and all its content onto a 2d canvas. This renderer should be used for browsers that do not support webGL.
 * Don't forget to add the CanvasRenderer.view to your DOM or you will not see anything :)
 *
 * @class CanvasRenderer
 * @constructor
 * @param game {Phaser.Game} A reference to the Phaser Game instance
 */
PIXI.CanvasRenderer = function (game) {

    /**
    * @property {Phaser.Game} game - A reference to the Phaser Game instance.
    */
    this.game = game;

    if (!PIXI.defaultRenderer)
    {
        PIXI.defaultRenderer = this;
    }

    /**
     * The renderer type.
     *
     * @property type
     * @type Number
     */
    this.type = PIXI.CANVAS_RENDERER;

    /**
     * The resolution of the canvas.
     *
     * @property resolution
     * @type Number
     */
    this.resolution = game.resolution;

    /**
     * This sets if the CanvasRenderer will clear the canvas or not before the new render pass.
     * If the Stage is NOT transparent Pixi will use a canvas sized fillRect operation every frame to set the canvas background color.
     * If the Stage is transparent Pixi will use clearRect to clear the canvas every frame.
     * Disable this by setting this to false. For example if your game has a canvas filling background image you often don't need this set.
     *
     * @property clearBeforeRender
     * @type Boolean
     * @default
     */
    this.clearBeforeRender = game.clearBeforeRender;

    /**
     * Whether the render view is transparent
     *
     * @property transparent
     * @type Boolean
     */
    this.transparent = game.transparent;

    /**
     * Whether the render view should be resized automatically
     *
     * @property autoResize
     * @type Boolean
     */
    this.autoResize = false;

    /**
     * The width of the canvas view
     *
     * @property width
     * @type Number
     * @default 800
     */
    this.width = game.width * this.resolution;

    /**
     * The height of the canvas view
     *
     * @property height
     * @type Number
     * @default 600
     */
    this.height = game.height * this.resolution;

    /**
     * The canvas element that everything is drawn to.
     *
     * @property view
     * @type HTMLCanvasElement
     */
    this.view = game.canvas;

    /**
     * The canvas 2d context that everything is drawn with
     * @property context
     * @type CanvasRenderingContext2D
     */
    this.context = this.view.getContext("2d", { alpha: this.transparent } );

    /**
     * Boolean flag controlling canvas refresh.
     *
     * @property refresh
     * @type Boolean
     */
    this.refresh = true;

    //  This is already done in the Game.setUpRenderer method.
    // this.view.width = this.width * this.resolution;
    // this.view.height = this.height * this.resolution;

    /**
     * Internal var.
     *
     * @property count
     * @type Number
     */
    this.count = 0;

    /**
     * Instance of a PIXI.CanvasMaskManager, handles masking when using the canvas renderer
     * @property CanvasMaskManager
     * @type CanvasMaskManager
     */
    this.maskManager = new PIXI.CanvasMaskManager();

    /**
     * The render session is just a bunch of parameter used for rendering
     * @property renderSession
     * @type Object
     */
    this.renderSession = {
        context: this.context,
        maskManager: this.maskManager,
        scaleMode: null,
        smoothProperty: Phaser.Canvas.getSmoothingPrefix(this.context),

        /**
         * If true Pixi will Math.floor() x/y values when rendering, stopping pixel interpolation.
         * Handy for crisp pixel art and speed on legacy devices.
         */
        roundPixels: false
    };

    this.mapBlendModes();
    
    this.resize(this.width, this.height);

};

// constructor
PIXI.CanvasRenderer.prototype.constructor = PIXI.CanvasRenderer;

/**
 * Renders the Stage to this canvas view
 *
 * @method render
 * @param stage {Stage} the Stage element to be rendered
 */
PIXI.CanvasRenderer.prototype.render = function (stage) {

    stage.updateTransform();

    this.context.setTransform(1, 0, 0, 1, 0, 0);

    this.context.globalAlpha = 1;

    this.renderSession.currentBlendMode = 0;
    this.context.globalCompositeOperation = 'source-over';

    if (navigator.isCocoonJS && this.view.screencanvas)
    {
        this.context.fillStyle = "black";
        this.context.clear();
    }
    
    if (this.clearBeforeRender)
    {
        if (this.transparent)
        {
            this.context.clearRect(0, 0, this.width, this.height);
        }
        else
        {
            this.context.fillStyle = stage._bgColor.rgba;
            this.context.fillRect(0, 0, this.width , this.height);
        }
    }
    
    this.renderDisplayObject(stage);

};

/**
 * Removes everything from the renderer and optionally removes the Canvas DOM element.
 *
 * @method destroy
 * @param [removeView=true] {boolean} Removes the Canvas element from the DOM.
 */
PIXI.CanvasRenderer.prototype.destroy = function(removeView)
{
    if (removeView === undefined) { removeView = true; }

    if (removeView && this.view.parent)
    {
        this.view.parent.removeChild(this.view);
    }

    this.view = null;
    this.context = null;
    this.maskManager = null;
    this.renderSession = null;

};

/**
 * Resizes the canvas view to the specified width and height
 *
 * @method resize
 * @param width {Number} the new width of the canvas view
 * @param height {Number} the new height of the canvas view
 */
PIXI.CanvasRenderer.prototype.resize = function(width, height)
{
    this.width = width * this.resolution;
    this.height = height * this.resolution;

    this.view.width = this.width;
    this.view.height = this.height;

    if (this.autoResize)
    {
        this.view.style.width = this.width / this.resolution + "px";
        this.view.style.height = this.height / this.resolution + "px";
    }
};

/**
 * Renders a display object
 *
 * @method renderDisplayObject
 * @param displayObject {DisplayObject} The displayObject to render
 * @param context {CanvasRenderingContext2D} the context 2d method of the canvas
 * @param [matrix] {Matrix} Optional matrix to apply to the display object before rendering.
 * @private
 */
PIXI.CanvasRenderer.prototype.renderDisplayObject = function (displayObject, context, matrix) {

    this.renderSession.context = context || this.context;
    this.renderSession.resolution = this.resolution;
    displayObject._renderCanvas(this.renderSession, matrix);

};

/**
 * Maps Pixi blend modes to canvas blend modes.
 *
 * @method mapBlendModes
 * @private
 */
PIXI.CanvasRenderer.prototype.mapBlendModes = function () {

    if (!PIXI.blendModesCanvas)
    {
        var b = [];
        var modes = PIXI.blendModes;
        var useNew = PIXI.canUseNewCanvasBlendModes();

        b[modes.NORMAL] = 'source-over';
        b[modes.ADD] = 'lighter';
        b[modes.MULTIPLY] = (useNew) ? 'multiply' : 'source-over';
        b[modes.SCREEN] = (useNew) ? 'screen' : 'source-over';
        b[modes.OVERLAY] = (useNew) ? 'overlay' : 'source-over';
        b[modes.DARKEN] = (useNew) ? 'darken' : 'source-over';
        b[modes.LIGHTEN] = (useNew) ? 'lighten' : 'source-over';
        b[modes.COLOR_DODGE] = (useNew) ? 'color-dodge' : 'source-over';
        b[modes.COLOR_BURN] = (useNew) ? 'color-burn' : 'source-over';
        b[modes.HARD_LIGHT] = (useNew) ? 'hard-light' : 'source-over';
        b[modes.SOFT_LIGHT] = (useNew) ? 'soft-light' : 'source-over';
        b[modes.DIFFERENCE] = (useNew) ? 'difference' : 'source-over';
        b[modes.EXCLUSION] = (useNew) ? 'exclusion' : 'source-over';
        b[modes.HUE] = (useNew) ? 'hue' : 'source-over';
        b[modes.SATURATION] = (useNew) ? 'saturation' : 'source-over';
        b[modes.COLOR] = (useNew) ? 'color' : 'source-over';
        b[modes.LUMINOSITY] = (useNew) ? 'luminosity' : 'source-over';

        PIXI.blendModesCanvas = b;
    }

};

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

PIXI.BaseTextureCache = {};

PIXI.BaseTextureCacheIdGenerator = 0;

/**
 * A texture stores the information that represents an image. All textures have a base texture.
 *
 * @class BaseTexture
 * @uses EventTarget
 * @constructor
 * @param source {String} the source object (image or canvas)
 * @param scaleMode {Number} See {{#crossLink "PIXI/scaleModes:property"}}PIXI.scaleModes{{/crossLink}} for possible values
 */
PIXI.BaseTexture = function(source, scaleMode)
{
    /**
     * The Resolution of the texture. 
     *
     * @property resolution
     * @type Number
     */
    this.resolution = 1;
    
    /**
     * [read-only] The width of the base texture set when the image has loaded
     *
     * @property width
     * @type Number
     * @readOnly
     */
    this.width = 100;

    /**
     * [read-only] The height of the base texture set when the image has loaded
     *
     * @property height
     * @type Number
     * @readOnly
     */
    this.height = 100;

    /**
     * The scale mode to apply when scaling this texture
     * 
     * @property scaleMode
     * @type {Number}
     * @default PIXI.scaleModes.LINEAR
     */
    this.scaleMode = scaleMode || PIXI.scaleModes.DEFAULT;

    /**
     * [read-only] Set to true once the base texture has loaded
     *
     * @property hasLoaded
     * @type Boolean
     * @readOnly
     */
    this.hasLoaded = false;

    /**
     * The image source that is used to create the texture.
     *
     * @property source
     * @type Image
     */
    this.source = source;

    this._UID = PIXI._UID++;

    /**
     * Controls if RGB channels should be pre-multiplied by Alpha  (WebGL only)
     *
     * @property premultipliedAlpha
     * @type Boolean
     * @default true
     */
    this.premultipliedAlpha = true;

    // used for webGL

    /**
     * @property _glTextures
     * @type Array
     * @private
     */
    this._glTextures = [];

    /**
     * Set this to true if a mipmap of this texture needs to be generated. This value needs to be set before the texture is used
     * Also the texture must be a power of two size to work
     * 
     * @property mipmap
     * @type {Boolean}
     */
    this.mipmap = false;

    /**
     * @property _dirty
     * @type Array
     * @private
     */
    this._dirty = [true, true, true, true];

    if (!source)
    {
        return;
    }

    if ((this.source.complete || this.source.getContext) && this.source.width && this.source.height)
    {
        this.hasLoaded = true;
        this.width = this.source.naturalWidth || this.source.width;
        this.height = this.source.naturalHeight || this.source.height;
        this.dirty();
    }

    /**
     * A BaseTexture can be set to skip the rendering phase in the WebGL Sprite Batch.
     * 
     * You may want to do this if you have a parent Sprite with no visible texture (i.e. uses the internal `__default` texture)
     * that has children that you do want to render, without causing a batch flush in the process.
     * 
     * @property skipRender
     * @type Boolean
     */
    this.skipRender = false;

    /**
     * @property imageUrl
     * @type String
     */
    this.imageUrl = null;

    /**
     * @property _powerOf2
     * @type Boolean
     * @private
     */
    this._powerOf2 = false;

};

PIXI.BaseTexture.prototype.constructor = PIXI.BaseTexture;

/**
 * Forces this BaseTexture to be set as loaded, with the given width and height.
 * Then calls BaseTexture.dirty.
 * Important for when you don't want to modify the source object by forcing in `complete` or dimension properties it may not have.
 *
 * @method forceLoaded
 * @param {number} width - The new width to force the BaseTexture to be.
 * @param {number} height - The new height to force the BaseTexture to be.
 */
PIXI.BaseTexture.prototype.forceLoaded = function(width, height)
{
    this.hasLoaded = true;
    this.width = width;
    this.height = height;
    this.dirty();

};

/**
 * Destroys this base texture
 *
 * @method destroy
 */
PIXI.BaseTexture.prototype.destroy = function()
{
    if (this.imageUrl)
    {
        delete PIXI.BaseTextureCache[this.imageUrl];
        delete PIXI.TextureCache[this.imageUrl];

        this.imageUrl = null;

        if (!navigator.isCocoonJS) this.source.src = '';
    }
    else if (this.source)
    {
        PIXI.CanvasPool.removeByCanvas(this.source);

        if (this.source._pixiId)
        {
            delete PIXI.BaseTextureCache[this.source._pixiId];
        }
    }

    this.source = null;

    this.unloadFromGPU();
};

/**
 * Changes the source image of the texture
 *
 * @method updateSourceImage
 * @param newSrc {String} the path of the image
 */
PIXI.BaseTexture.prototype.updateSourceImage = function(newSrc)
{
    this.hasLoaded = false;
    this.source.src = null;
    this.source.src = newSrc;
};

/**
 * Sets all glTextures to be dirty.
 *
 * @method dirty
 */
PIXI.BaseTexture.prototype.dirty = function()
{
    for (var i = 0; i < this._glTextures.length; i++)
    {
        this._dirty[i] = true;
    }
};

/**
 * Removes the base texture from the GPU, useful for managing resources on the GPU.
 * Atexture is still 100% usable and will simply be reuploaded if there is a sprite on screen that is using it.
 *
 * @method unloadFromGPU
 */
PIXI.BaseTexture.prototype.unloadFromGPU = function()
{
    this.dirty();

    // delete the webGL textures if any.
    for (var i = this._glTextures.length - 1; i >= 0; i--)
    {
        var glTexture = this._glTextures[i];
        var gl = PIXI.glContexts[i];

        if(gl && glTexture)
        {
            gl.deleteTexture(glTexture);
        }
        
    }

    this._glTextures.length = 0;

    this.dirty();
};

/**
 * Helper function that creates a base texture from the given image url.
 * If the image is not in the base texture cache it will be created and loaded.
 *
 * @static
 * @method fromImage
 * @param imageUrl {String} The image url of the texture
 * @param crossorigin {Boolean}
 * @param scaleMode {Number} See {{#crossLink "PIXI/scaleModes:property"}}PIXI.scaleModes{{/crossLink}} for possible values
 * @return {BaseTexture}
 */
PIXI.BaseTexture.fromImage = function(imageUrl, crossorigin, scaleMode)
{
    var baseTexture = PIXI.BaseTextureCache[imageUrl];

    if(crossorigin === undefined && imageUrl.indexOf('data:') === -1) crossorigin = true;

    if(!baseTexture)
    {
        // new Image() breaks tex loading in some versions of Chrome.
        // See https://code.google.com/p/chromium/issues/detail?id=238071
        var image = new Image();

        if (crossorigin)
        {
            image.crossOrigin = '';
        }

        image.src = imageUrl;
        baseTexture = new PIXI.BaseTexture(image, scaleMode);
        baseTexture.imageUrl = imageUrl;
        PIXI.BaseTextureCache[imageUrl] = baseTexture;

        // if there is an @2x at the end of the url we are going to assume its a highres image
        if( imageUrl.indexOf(PIXI.RETINA_PREFIX + '.') !== -1)
        {
            baseTexture.resolution = 2;
        }
    }

    return baseTexture;
};

/**
 * Helper function that creates a base texture from the given canvas element.
 *
 * @static
 * @method fromCanvas
 * @param canvas {Canvas} The canvas element source of the texture
 * @param scaleMode {Number} See {{#crossLink "PIXI/scaleModes:property"}}PIXI.scaleModes{{/crossLink}} for possible values
 * @return {BaseTexture}
 */
PIXI.BaseTexture.fromCanvas = function(canvas, scaleMode)
{
    if (!canvas._pixiId)
    {
        canvas._pixiId = 'canvas_' + PIXI.TextureCacheIdGenerator++;
    }

    if (canvas.width === 0)
    {
        canvas.width = 1;
    }

    if (canvas.height === 0)
    {
        canvas.height = 1;
    }

    var baseTexture = PIXI.BaseTextureCache[canvas._pixiId];

    if (!baseTexture)
    {
        baseTexture = new PIXI.BaseTexture(canvas, scaleMode);
        PIXI.BaseTextureCache[canvas._pixiId] = baseTexture;
    }

    return baseTexture;
};

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

PIXI.TextureCache = {};
PIXI.FrameCache = {};

/**
 * TextureSilentFail is a boolean that defaults to `false`. 
 * If `true` then `PIXI.Texture.setFrame` will no longer throw an error if the texture dimensions are incorrect. 
 * Instead `Texture.valid` will be set to `false` (#1556)
 *
 * @type {boolean}
 */
PIXI.TextureSilentFail = false;

PIXI.TextureCacheIdGenerator = 0;

/**
 * A texture stores the information that represents an image or part of an image. It cannot be added
 * to the display list directly. Instead use it as the texture for a PIXI.Sprite. If no frame is provided then the whole image is used.
 *
 * @class Texture
 * @uses EventTarget
 * @constructor
 * @param baseTexture {BaseTexture} The base texture source to create the texture from
 * @param frame {Rectangle} The rectangle frame of the texture to show
 * @param [crop] {Rectangle} The area of original texture 
 * @param [trim] {Rectangle} Trimmed texture rectangle
 */
PIXI.Texture = function(baseTexture, frame, crop, trim)
{
    /**
     * Does this Texture have any frame data assigned to it?
     *
     * @property noFrame
     * @type Boolean
     */
    this.noFrame = false;

    if (!frame)
    {
        this.noFrame = true;
        frame = new PIXI.Rectangle(0,0,1,1);
    }

    if (baseTexture instanceof PIXI.Texture)
    {
        baseTexture = baseTexture.baseTexture;
    }

    /**
     * The base texture that this texture uses.
     *
     * @property baseTexture
     * @type BaseTexture
     */
    this.baseTexture = baseTexture;

    /**
     * The frame specifies the region of the base texture that this texture uses
     *
     * @property frame
     * @type Rectangle
     */
    this.frame = frame;

    /**
     * The texture trim data.
     *
     * @property trim
     * @type Rectangle
     */
    this.trim = trim;

    /**
     * This will let the renderer know if the texture is valid. If it's not then it cannot be rendered.
     *
     * @property valid
     * @type Boolean
     */
    this.valid = false;

    /**
     * Is this a tiling texture? As used by the likes of a TilingSprite.
     *
     * @property isTiling
     * @type Boolean
     */
    this.isTiling = false;

    /**
     * This will let a renderer know that a texture has been updated (used mainly for webGL uv updates)
     *
     * @property requiresUpdate
     * @type Boolean
     */
    this.requiresUpdate = false;

    /**
     * This will let a renderer know that a tinted parent has updated its texture.
     *
     * @property requiresReTint
     * @type Boolean
     */
    this.requiresReTint = false;

    /**
     * The WebGL UV data cache.
     *
     * @property _uvs
     * @type Object
     * @private
     */
    this._uvs = null;

    /**
     * The width of the Texture in pixels.
     *
     * @property width
     * @type Number
     */
    this.width = 0;

    /**
     * The height of the Texture in pixels.
     *
     * @property height
     * @type Number
     */
    this.height = 0;

    /**
     * This is the area of the BaseTexture image to actually copy to the Canvas / WebGL when rendering,
     * irrespective of the actual frame size or placement (which can be influenced by trimmed texture atlases)
     *
     * @property crop
     * @type Rectangle
     */
    this.crop = crop || new PIXI.Rectangle(0, 0, 1, 1);

    if (baseTexture.hasLoaded)
    {
        if (this.noFrame) frame = new PIXI.Rectangle(0, 0, baseTexture.width, baseTexture.height);
        this.setFrame(frame);
    }

};

PIXI.Texture.prototype.constructor = PIXI.Texture;

/**
 * Called when the base texture is loaded
 *
 * @method onBaseTextureLoaded
 * @private
 */
PIXI.Texture.prototype.onBaseTextureLoaded = function()
{
    var baseTexture = this.baseTexture;

    if (this.noFrame)
    {
        this.frame = new PIXI.Rectangle(0, 0, baseTexture.width, baseTexture.height);
    }

    this.setFrame(this.frame);
};

/**
 * Destroys this texture
 *
 * @method destroy
 * @param destroyBase {Boolean} Whether to destroy the base texture as well
 */
PIXI.Texture.prototype.destroy = function(destroyBase)
{
    if (destroyBase) this.baseTexture.destroy();

    this.valid = false;
};

/**
 * Specifies the region of the baseTexture that this texture will use.
 *
 * @method setFrame
 * @param frame {Rectangle} The frame of the texture to set it to
 */
PIXI.Texture.prototype.setFrame = function(frame)
{
    this.noFrame = false;

    this.frame = frame;
    this.width = frame.width;
    this.height = frame.height;

    this.crop.x = frame.x;
    this.crop.y = frame.y;
    this.crop.width = frame.width;
    this.crop.height = frame.height;

    if (!this.trim && (frame.x + frame.width > this.baseTexture.width || frame.y + frame.height > this.baseTexture.height))
    {
        if (!PIXI.TextureSilentFail)
        {
            throw new Error('Texture Error: frame does not fit inside the base Texture dimensions ' + this);
        }

        this.valid = false;
        return;
    }

    this.valid = frame && frame.width && frame.height && this.baseTexture.source && this.baseTexture.hasLoaded;

    if (this.trim)
    {
        this.width = this.trim.width;
        this.height = this.trim.height;
        this.frame.width = this.trim.width;
        this.frame.height = this.trim.height;
    }
    
    if (this.valid) this._updateUvs();

};

/**
 * Updates the internal WebGL UV cache.
 *
 * @method _updateUvs
 * @private
 */
PIXI.Texture.prototype._updateUvs = function()
{
    if(!this._uvs)this._uvs = new PIXI.TextureUvs();

    var frame = this.crop;
    var tw = this.baseTexture.width;
    var th = this.baseTexture.height;
    
    this._uvs.x0 = frame.x / tw;
    this._uvs.y0 = frame.y / th;

    this._uvs.x1 = (frame.x + frame.width) / tw;
    this._uvs.y1 = frame.y / th;

    this._uvs.x2 = (frame.x + frame.width) / tw;
    this._uvs.y2 = (frame.y + frame.height) / th;

    this._uvs.x3 = frame.x / tw;
    this._uvs.y3 = (frame.y + frame.height) / th;
};

/**
 * Helper function that creates a Texture object from the given image url.
 * If the image is not in the texture cache it will be  created and loaded.
 *
 * @static
 * @method fromImage
 * @param imageUrl {String} The image url of the texture
 * @param crossorigin {Boolean} Whether requests should be treated as crossorigin
 * @param scaleMode {Number} See {{#crossLink "PIXI/scaleModes:property"}}PIXI.scaleModes{{/crossLink}} for possible values
 * @return {Texture}
 */
PIXI.Texture.fromImage = function(imageUrl, crossorigin, scaleMode)
{
    var texture = PIXI.TextureCache[imageUrl];

    if(!texture)
    {
        texture = new PIXI.Texture(PIXI.BaseTexture.fromImage(imageUrl, crossorigin, scaleMode));
        PIXI.TextureCache[imageUrl] = texture;
    }

    return texture;
};

/**
 * Helper function that returns a Texture objected based on the given frame id.
 * If the frame id is not in the texture cache an error will be thrown.
 *
 * @static
 * @method fromFrame
 * @param frameId {String} The frame id of the texture
 * @return {Texture}
 */
PIXI.Texture.fromFrame = function(frameId)
{
    var texture = PIXI.TextureCache[frameId];
    if(!texture) throw new Error('The frameId "' + frameId + '" does not exist in the texture cache ');
    return texture;
};

/**
 * Helper function that creates a new a Texture based on the given canvas element.
 *
 * @static
 * @method fromCanvas
 * @param canvas {Canvas} The canvas element source of the texture
 * @param scaleMode {Number} See {{#crossLink "PIXI/scaleModes:property"}}PIXI.scaleModes{{/crossLink}} for possible values
 * @return {Texture}
 */
PIXI.Texture.fromCanvas = function(canvas, scaleMode)
{
    var baseTexture = PIXI.BaseTexture.fromCanvas(canvas, scaleMode);

    return new PIXI.Texture(baseTexture);
};

/**
 * Adds a texture to the global PIXI.TextureCache. This cache is shared across the whole PIXI object.
 *
 * @static
 * @method addTextureToCache
 * @param texture {Texture} The Texture to add to the cache.
 * @param id {String} The id that the texture will be stored against.
 */
PIXI.Texture.addTextureToCache = function(texture, id)
{
    PIXI.TextureCache[id] = texture;
};

/**
 * Remove a texture from the global PIXI.TextureCache.
 *
 * @static
 * @method removeTextureFromCache
 * @param id {String} The id of the texture to be removed
 * @return {Texture} The texture that was removed
 */
PIXI.Texture.removeTextureFromCache = function(id)
{
    var texture = PIXI.TextureCache[id];
    delete PIXI.TextureCache[id];
    delete PIXI.BaseTextureCache[id];
    return texture;
};

PIXI.TextureUvs = function()
{
    this.x0 = 0;
    this.y0 = 0;

    this.x1 = 0;
    this.y1 = 0;

    this.x2 = 0;
    this.y2 = 0;

    this.x3 = 0;
    this.y3 = 0;
};

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

/**
 * A RenderTexture is a special texture that allows any Pixi display object to be rendered to it.
 *
 * __Hint__: All DisplayObjects (i.e. Sprites) that render to a RenderTexture should be preloaded otherwise black rectangles will be drawn instead.
 *
 * A RenderTexture takes a snapshot of any Display Object given to its render method. The position and rotation of the given Display Objects is ignored. For example:
 *
 *    var renderTexture = new PIXI.RenderTexture(800, 600);
 *    var sprite = PIXI.Sprite.fromImage("spinObj_01.png");
 *    sprite.position.x = 800/2;
 *    sprite.position.y = 600/2;
 *    sprite.anchor.x = 0.5;
 *    sprite.anchor.y = 0.5;
 *    renderTexture.render(sprite);
 *
 * The Sprite in this case will be rendered to a position of 0,0. To render this sprite at its actual position a DisplayObjectContainer should be used:
 *
 *    var doc = new PIXI.DisplayObjectContainer();
 *    doc.addChild(sprite);
 *    renderTexture.render(doc);  // Renders to center of renderTexture
 *
 * @class RenderTexture
 * @extends Texture
 * @constructor
 * @param width {Number} The width of the render texture
 * @param height {Number} The height of the render texture
 * @param renderer {CanvasRenderer|WebGLRenderer} The renderer used for this RenderTexture
 * @param scaleMode {Number} See {{#crossLink "PIXI/scaleModes:property"}}PIXI.scaleModes{{/crossLink}} for possible values
 * @param resolution {Number} The resolution of the texture being generated
 */
PIXI.RenderTexture = function(width, height, renderer, scaleMode, resolution)
{
    /**
     * The with of the render texture
     *
     * @property width
     * @type Number
     */
    this.width = width || 100;

    /**
     * The height of the render texture
     *
     * @property height
     * @type Number
     */
    this.height = height || 100;

    /**
     * The Resolution of the texture.
     *
     * @property resolution
     * @type Number
     */
    this.resolution = resolution || 1;

    /**
     * The framing rectangle of the render texture
     *
     * @property frame
     * @type Rectangle
     */
    this.frame = new PIXI.Rectangle(0, 0, this.width * this.resolution, this.height * this.resolution);

    /**
     * This is the area of the BaseTexture image to actually copy to the Canvas / WebGL when rendering,
     * irrespective of the actual frame size or placement (which can be influenced by trimmed texture atlases)
     *
     * @property crop
     * @type Rectangle
     */
    this.crop = new PIXI.Rectangle(0, 0, this.width * this.resolution, this.height * this.resolution);

    /**
     * The base texture object that this texture uses
     *
     * @property baseTexture
     * @type BaseTexture
     */
    this.baseTexture = new PIXI.BaseTexture();
    this.baseTexture.width = this.width * this.resolution;
    this.baseTexture.height = this.height * this.resolution;
    this.baseTexture._glTextures = [];
    this.baseTexture.resolution = this.resolution;

    this.baseTexture.scaleMode = scaleMode || PIXI.scaleModes.DEFAULT;

    this.baseTexture.hasLoaded = true;

    PIXI.Texture.call(this,
        this.baseTexture,
        new PIXI.Rectangle(0, 0, this.width * this.resolution, this.height * this.resolution)
    );

    /**
     * The renderer this RenderTexture uses. A RenderTexture can only belong to one renderer at the moment if its webGL.
     *
     * @property renderer
     * @type CanvasRenderer|WebGLRenderer
     */
    this.renderer = renderer || PIXI.defaultRenderer;

    if (this.renderer.type === PIXI.WEBGL_RENDERER)
    {
        var gl = this.renderer.gl;
        this.baseTexture._dirty[gl.id] = false;

        this.textureBuffer = new PIXI.FilterTexture(gl, this.width, this.height, this.baseTexture.scaleMode);
        this.baseTexture._glTextures[gl.id] =  this.textureBuffer.texture;

        this.render = this.renderWebGL;
        this.projection = new PIXI.Point(this.width * 0.5, -this.height * 0.5);
    }
    else
    {
        this.render = this.renderCanvas;
        this.textureBuffer = new PIXI.CanvasBuffer(this.width * this.resolution, this.height * this.resolution);
        this.baseTexture.source = this.textureBuffer.canvas;
    }

    /**
     * @property valid
     * @type Boolean
     */
    this.valid = true;

    this.tempMatrix = new Phaser.Matrix();

    this._updateUvs();
};

PIXI.RenderTexture.prototype = Object.create(PIXI.Texture.prototype);
PIXI.RenderTexture.prototype.constructor = PIXI.RenderTexture;

/**
 * Resizes the RenderTexture.
 *
 * @method resize
 * @param width {Number} The width to resize to.
 * @param height {Number} The height to resize to.
 * @param updateBase {Boolean} Should the baseTexture.width and height values be resized as well?
 */
PIXI.RenderTexture.prototype.resize = function(width, height, updateBase)
{
    if (width === this.width && height === this.height)return;

    this.valid = (width > 0 && height > 0);

    this.width = width;
    this.height = height;
    this.frame.width = this.crop.width = width * this.resolution;
    this.frame.height = this.crop.height = height * this.resolution;

    if (updateBase)
    {
        this.baseTexture.width = this.width * this.resolution;
        this.baseTexture.height = this.height * this.resolution;
    }

    if (this.renderer.type === PIXI.WEBGL_RENDERER)
    {
        this.projection.x = this.width / 2;
        this.projection.y = -this.height / 2;
    }

    if(!this.valid)return;

    this.textureBuffer.resize(this.width, this.height);
};

/**
 * Clears the RenderTexture.
 *
 * @method clear
 */
PIXI.RenderTexture.prototype.clear = function()
{
    if (!this.valid)
    {
        return;
    }

    if (this.renderer.type === PIXI.WEBGL_RENDERER)
    {
        this.renderer.gl.bindFramebuffer(this.renderer.gl.FRAMEBUFFER, this.textureBuffer.frameBuffer);
    }

    this.textureBuffer.clear();
};

/**
 * This function will draw the display object to the texture.
 *
 * @method renderWebGL
 * @param displayObject {DisplayObject} The display object to render this texture on
 * @param [matrix] {Matrix} Optional matrix to apply to the display object before rendering.
 * @param [clear] {Boolean} If true the texture will be cleared before the displayObject is drawn
 * @private
 */
PIXI.RenderTexture.prototype.renderWebGL = function(displayObject, matrix, clear)
{
    if (!this.valid || displayObject.alpha === 0)
    {
        return;
    }
   
    //  Let's create a nice matrix to apply to our display object.
    //  Frame buffers come in upside down so we need to flip the matrix.
    var wt = displayObject.worldTransform;
    wt.identity();
    wt.translate(0, this.projection.y * 2);

    if (matrix)
    {
        wt.append(matrix);
    }

    wt.scale(1, -1);

    //  Time to update all the children of the displayObject with the new matrix.
    for (var i = 0; i < displayObject.children.length; i++)
    {
        displayObject.children[i].updateTransform();
    }
    
    //  Time for the webGL fun stuff!
    var gl = this.renderer.gl;

    gl.viewport(0, 0, this.width * this.resolution, this.height * this.resolution);

    gl.bindFramebuffer(gl.FRAMEBUFFER, this.textureBuffer.frameBuffer );

    if (clear)
    {
        this.textureBuffer.clear();
    }

    this.renderer.spriteBatch.dirty = true;

    this.renderer.renderDisplayObject(displayObject, this.projection, this.textureBuffer.frameBuffer, matrix);

    this.renderer.spriteBatch.dirty = true;

};

/**
 * This function will draw the display object to the texture.
 *
 * @method renderCanvas
 * @param displayObject {DisplayObject} The display object to render this texture on
 * @param [matrix] {Matrix} Optional matrix to apply to the display object before rendering.
 * @param [clear] {Boolean} If true the texture will be cleared before the displayObject is drawn
 * @private
 */
PIXI.RenderTexture.prototype.renderCanvas = function(displayObject, matrix, clear)
{
    if (!this.valid || displayObject.alpha === 0)
    {
        return;
    }

    //  Let's create a nice matrix to apply to our display object.
    //  Frame buffers come in upside down so we need to flip the matrix.
    var wt = displayObject.worldTransform;
    wt.identity();

    if (matrix)
    {
        wt.append(matrix);
    }

    // Time to update all the children of the displayObject with the new matrix (what new matrix? there isn't one!)
    for (var i = 0; i < displayObject.children.length; i++)
    {
        displayObject.children[i].updateTransform();
    }

    if (clear)
    {
        this.textureBuffer.clear();
    }

    var realResolution = this.renderer.resolution;

    this.renderer.resolution = this.resolution;

    this.renderer.renderDisplayObject(displayObject, this.textureBuffer.context, matrix);

    this.renderer.resolution = realResolution;
};

/**
 * Will return a HTML Image of the texture
 *
 * @method getImage
 * @return {Image}
 */
PIXI.RenderTexture.prototype.getImage = function()
{
    var image = new Image();
    image.src = this.getBase64();
    return image;
};

/**
 * Will return a base64 encoded string of this texture. It works by calling RenderTexture.getCanvas and then running toDataURL on that.
 *
 * @method getBase64
 * @return {String} A base64 encoded string of the texture.
 */
PIXI.RenderTexture.prototype.getBase64 = function()
{
    return this.getCanvas().toDataURL();
};

/**
 * Creates a Canvas element, renders this RenderTexture to it and then returns it.
 *
 * @method getCanvas
 * @return {HTMLCanvasElement} A Canvas element with the texture rendered on.
 */
PIXI.RenderTexture.prototype.getCanvas = function()
{
    if (this.renderer.type === PIXI.WEBGL_RENDERER)
    {
        var gl =  this.renderer.gl;
        var width = this.textureBuffer.width;
        var height = this.textureBuffer.height;

        var webGLPixels = new Uint8Array(4 * width * height);

        gl.bindFramebuffer(gl.FRAMEBUFFER, this.textureBuffer.frameBuffer);
        gl.readPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, webGLPixels);
        gl.bindFramebuffer(gl.FRAMEBUFFER, null);

        var tempCanvas = new PIXI.CanvasBuffer(width, height);
        var canvasData = tempCanvas.context.getImageData(0, 0, width, height);
        canvasData.data.set(webGLPixels);

        tempCanvas.context.putImageData(canvasData, 0, 0);

        return tempCanvas.canvas;
    }
    else
    {
        return this.textureBuffer.canvas;
    }
};

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

/**
 * This is the base class for creating a PIXI filter. Currently only webGL supports filters.
 * If you want to make a custom filter this should be your base class.
 * @class AbstractFilter
 * @constructor
 * @param fragmentSrc {Array} The fragment source in an array of strings.
 * @param uniforms {Object} An object containing the uniforms for this filter.
 */
PIXI.AbstractFilter = function(fragmentSrc, uniforms)
{
    /**
    * An array of passes - some filters contain a few steps this array simply stores the steps in a liniear fashion.
    * For example the blur filter has two passes blurX and blurY.
    * @property passes
    * @type Array(Filter)
    * @private
    */
    this.passes = [this];

    /**
    * @property shaders
    * @type Array(Shader)
    * @private
    */
    this.shaders = [];
    
    /**
    * @property dirty
    * @type Boolean
    */
    this.dirty = true;

    /**
    * @property padding
    * @type Number
    */
    this.padding = 0;

    /**
    * @property uniforms
    * @type object
    * @private
    */
    this.uniforms = uniforms || {};

    /**
    * @property fragmentSrc
    * @type Array
    * @private
    */
    this.fragmentSrc = fragmentSrc || [];
};

PIXI.AbstractFilter.prototype.constructor = PIXI.AbstractFilter;

/**
 * Syncs the uniforms between the class object and the shaders.
 *
 * @method syncUniforms
 */
PIXI.AbstractFilter.prototype.syncUniforms = function()
{
    for(var i=0,j=this.shaders.length; i<j; i++)
    {
        this.shaders[i].dirty = true;
    }
};

/*
PIXI.AbstractFilter.prototype.apply = function(frameBuffer)
{
    // TODO :)
};
*/
/**
 * @author Mat Groves http://matgroves.com/
 */

 /**
 *
 * @class Strip
 * @extends DisplayObjectContainer
 * @constructor
 * @param texture {Texture} The texture to use
 * @param width {Number} the width
 * @param height {Number} the height
 *
 */
PIXI.Strip = function(texture)
{
    PIXI.DisplayObjectContainer.call( this );


    /**
     * The texture of the strip
     *
     * @property texture
     * @type Texture
     */
    this.texture = texture;

    // set up the main bits..
    this.uvs = new PIXI.Float32Array([0, 1,
                                      1, 1,
                                      1, 0,
                                      0, 1]);

    this.vertices = new PIXI.Float32Array([0, 0,
                                            100, 0,
                                            100, 100,
                                            0, 100]);

    this.colors = new PIXI.Float32Array([1, 1, 1, 1]);

    this.indices = new PIXI.Uint16Array([0, 1, 2, 3]);

    /**
     * Whether the strip is dirty or not
     *
     * @property dirty
     * @type Boolean
     */
    this.dirty = true;

    /**
     * The blend mode to be applied to the sprite. Set to PIXI.blendModes.NORMAL to remove any blend mode.
     *
     * @property blendMode
     * @type Number
     * @default PIXI.blendModes.NORMAL;
     */
    this.blendMode = PIXI.blendModes.NORMAL;

    /**
     * Triangles in canvas mode are automatically antialiased, use this value to force triangles to overlap a bit with each other.
     *
     * @property canvasPadding
     * @type Number
     */
    this.canvasPadding = 0;

    this.drawMode = PIXI.Strip.DrawModes.TRIANGLE_STRIP;

};

// constructor
PIXI.Strip.prototype = Object.create(PIXI.DisplayObjectContainer.prototype);
PIXI.Strip.prototype.constructor = PIXI.Strip;

PIXI.Strip.prototype._renderWebGL = function(renderSession)
{
    // if the sprite is not visible or the alpha is 0 then no need to render this element
    if(!this.visible || this.alpha <= 0)return;
    // render triangle strip..

    renderSession.spriteBatch.stop();

    // init! init!
    if(!this._vertexBuffer)this._initWebGL(renderSession);

    renderSession.shaderManager.setShader(renderSession.shaderManager.stripShader);

    this._renderStrip(renderSession);

    ///renderSession.shaderManager.activateDefaultShader();

    renderSession.spriteBatch.start();

    //TODO check culling
};

PIXI.Strip.prototype._initWebGL = function(renderSession)
{
    // build the strip!
    var gl = renderSession.gl;

    this._vertexBuffer = gl.createBuffer();
    this._indexBuffer = gl.createBuffer();
    this._uvBuffer = gl.createBuffer();
    this._colorBuffer = gl.createBuffer();

    gl.bindBuffer(gl.ARRAY_BUFFER, this._vertexBuffer);
    gl.bufferData(gl.ARRAY_BUFFER, this.vertices, gl.DYNAMIC_DRAW);

    gl.bindBuffer(gl.ARRAY_BUFFER, this._uvBuffer);
    gl.bufferData(gl.ARRAY_BUFFER,  this.uvs, gl.STATIC_DRAW);

    gl.bindBuffer(gl.ARRAY_BUFFER, this._colorBuffer);
    gl.bufferData(gl.ARRAY_BUFFER, this.colors, gl.STATIC_DRAW);

    gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this._indexBuffer);
    gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, this.indices, gl.STATIC_DRAW);
};

PIXI.Strip.prototype._renderStrip = function(renderSession)
{
    var gl = renderSession.gl;
    var projection = renderSession.projection,
        offset = renderSession.offset,
        shader = renderSession.shaderManager.stripShader;

    var drawMode = this.drawMode === PIXI.Strip.DrawModes.TRIANGLE_STRIP ? gl.TRIANGLE_STRIP : gl.TRIANGLES;

    // gl.uniformMatrix4fv(shaderProgram.mvMatrixUniform, false, mat4Real);

    renderSession.blendModeManager.setBlendMode(this.blendMode);


    // set uniforms
    gl.uniformMatrix3fv(shader.translationMatrix, false, this.worldTransform.toArray(true));
    gl.uniform2f(shader.projectionVector, projection.x, -projection.y);
    gl.uniform2f(shader.offsetVector, -offset.x, -offset.y);
    gl.uniform1f(shader.alpha, this.worldAlpha);

    if(!this.dirty)
    {

        gl.bindBuffer(gl.ARRAY_BUFFER, this._vertexBuffer);
        gl.bufferSubData(gl.ARRAY_BUFFER, 0, this.vertices);
        gl.vertexAttribPointer(shader.aVertexPosition, 2, gl.FLOAT, false, 0, 0);

        // update the uvs
        gl.bindBuffer(gl.ARRAY_BUFFER, this._uvBuffer);
        gl.vertexAttribPointer(shader.aTextureCoord, 2, gl.FLOAT, false, 0, 0);

        gl.activeTexture(gl.TEXTURE0);

        // check if a texture is dirty..
        if(this.texture.baseTexture._dirty[gl.id])
        {
            renderSession.renderer.updateTexture(this.texture.baseTexture);
        }
        else
        {
            // bind the current texture
            gl.bindTexture(gl.TEXTURE_2D, this.texture.baseTexture._glTextures[gl.id]);
        }

        // dont need to upload!
        gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this._indexBuffer);


    }
    else
    {

        this.dirty = false;
        gl.bindBuffer(gl.ARRAY_BUFFER, this._vertexBuffer);
        gl.bufferData(gl.ARRAY_BUFFER, this.vertices, gl.STATIC_DRAW);
        gl.vertexAttribPointer(shader.aVertexPosition, 2, gl.FLOAT, false, 0, 0);

        // update the uvs
        gl.bindBuffer(gl.ARRAY_BUFFER, this._uvBuffer);
        gl.bufferData(gl.ARRAY_BUFFER, this.uvs, gl.STATIC_DRAW);
        gl.vertexAttribPointer(shader.aTextureCoord, 2, gl.FLOAT, false, 0, 0);

        gl.activeTexture(gl.TEXTURE0);

        // check if a texture is dirty..
        if(this.texture.baseTexture._dirty[gl.id])
        {
            renderSession.renderer.updateTexture(this.texture.baseTexture);
        }
        else
        {
            gl.bindTexture(gl.TEXTURE_2D, this.texture.baseTexture._glTextures[gl.id]);
        }

        // dont need to upload!
        gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this._indexBuffer);
        gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, this.indices, gl.STATIC_DRAW);

    }
    //console.log(gl.TRIANGLE_STRIP)
    //
    //
    gl.drawElements(drawMode, this.indices.length, gl.UNSIGNED_SHORT, 0);


};



PIXI.Strip.prototype._renderCanvas = function(renderSession)
{
    var context = renderSession.context;

    var transform = this.worldTransform;

    if (renderSession.roundPixels)
    {
        context.setTransform(transform.a, transform.b, transform.c, transform.d, transform.tx | 0, transform.ty | 0);
    }
    else
    {
        context.setTransform(transform.a, transform.b, transform.c, transform.d, transform.tx, transform.ty);
    }

    if (this.drawMode === PIXI.Strip.DrawModes.TRIANGLE_STRIP)
    {
        this._renderCanvasTriangleStrip(context);
    }
    else
    {
        this._renderCanvasTriangles(context);
    }
};

PIXI.Strip.prototype._renderCanvasTriangleStrip = function(context)
{
    // draw triangles!!
    var vertices = this.vertices;
    var uvs = this.uvs;

    var length = vertices.length / 2;
    this.count++;

    for (var i = 0; i < length - 2; i++) {
        // draw some triangles!
        var index = i * 2;
        this._renderCanvasDrawTriangle(context, vertices, uvs, index, (index + 2), (index + 4));
    }
};

PIXI.Strip.prototype._renderCanvasTriangles = function(context)
{
    // draw triangles!!
    var vertices = this.vertices;
    var uvs = this.uvs;
    var indices = this.indices;

    var length = indices.length;
    this.count++;

    for (var i = 0; i < length; i += 3) {
        // draw some triangles!
        var index0 = indices[i] * 2, index1 = indices[i + 1] * 2, index2 = indices[i + 2] * 2;
        this._renderCanvasDrawTriangle(context, vertices, uvs, index0, index1, index2);
    }
};

PIXI.Strip.prototype._renderCanvasDrawTriangle = function(context, vertices, uvs, index0, index1, index2)
{
    var textureSource = this.texture.baseTexture.source;
    var textureWidth = this.texture.width;
    var textureHeight = this.texture.height;

    var x0 = vertices[index0], x1 = vertices[index1], x2 = vertices[index2];
    var y0 = vertices[index0 + 1], y1 = vertices[index1 + 1], y2 = vertices[index2 + 1];

    var u0 = uvs[index0] * textureWidth, u1 = uvs[index1] * textureWidth, u2 = uvs[index2] * textureWidth;
    var v0 = uvs[index0 + 1] * textureHeight, v1 = uvs[index1 + 1] * textureHeight, v2 = uvs[index2 + 1] * textureHeight;

    if (this.canvasPadding > 0) {
        var paddingX = this.canvasPadding / this.worldTransform.a;
        var paddingY = this.canvasPadding / this.worldTransform.d;
        var centerX = (x0 + x1 + x2) / 3;
        var centerY = (y0 + y1 + y2) / 3;

        var normX = x0 - centerX;
        var normY = y0 - centerY;

        var dist = Math.sqrt(normX * normX + normY * normY);
        x0 = centerX + (normX / dist) * (dist + paddingX);
        y0 = centerY + (normY / dist) * (dist + paddingY);

        //

        normX = x1 - centerX;
        normY = y1 - centerY;

        dist = Math.sqrt(normX * normX + normY * normY);
        x1 = centerX + (normX / dist) * (dist + paddingX);
        y1 = centerY + (normY / dist) * (dist + paddingY);

        normX = x2 - centerX;
        normY = y2 - centerY;

        dist = Math.sqrt(normX * normX + normY * normY);
        x2 = centerX + (normX / dist) * (dist + paddingX);
        y2 = centerY + (normY / dist) * (dist + paddingY);
    }

    context.save();
    context.beginPath();


    context.moveTo(x0, y0);
    context.lineTo(x1, y1);
    context.lineTo(x2, y2);

    context.closePath();

    context.clip();

    // Compute matrix transform
    var delta =  (u0 * v1)      + (v0 * u2)      + (u1 * v2)      - (v1 * u2)      - (v0 * u1)      - (u0 * v2);
    var deltaA = (x0 * v1)      + (v0 * x2)      + (x1 * v2)      - (v1 * x2)      - (v0 * x1)      - (x0 * v2);
    var deltaB = (u0 * x1)      + (x0 * u2)      + (u1 * x2)      - (x1 * u2)      - (x0 * u1)      - (u0 * x2);
    var deltaC = (u0 * v1 * x2) + (v0 * x1 * u2) + (x0 * u1 * v2) - (x0 * v1 * u2) - (v0 * u1 * x2) - (u0 * x1 * v2);
    var deltaD = (y0 * v1)      + (v0 * y2)      + (y1 * v2)      - (v1 * y2)      - (v0 * y1)      - (y0 * v2);
    var deltaE = (u0 * y1)      + (y0 * u2)      + (u1 * y2)      - (y1 * u2)      - (y0 * u1)      - (u0 * y2);
    var deltaF = (u0 * v1 * y2) + (v0 * y1 * u2) + (y0 * u1 * v2) - (y0 * v1 * u2) - (v0 * u1 * y2) - (u0 * y1 * v2);

    context.transform(deltaA / delta, deltaD / delta,
        deltaB / delta, deltaE / delta,
        deltaC / delta, deltaF / delta);

    context.drawImage(textureSource, 0, 0);
    context.restore();
};



/**
 * Renders a flat strip
 *
 * @method renderStripFlat
 * @param strip {Strip} The Strip to render
 * @private
 */
PIXI.Strip.prototype.renderStripFlat = function(strip)
{
    var context = this.context;
    var vertices = strip.vertices;

    var length = vertices.length/2;
    this.count++;

    context.beginPath();
    for (var i=1; i < length-2; i++)
    {
        // draw some triangles!
        var index = i*2;

        var x0 = vertices[index],   x1 = vertices[index+2], x2 = vertices[index+4];
        var y0 = vertices[index+1], y1 = vertices[index+3], y2 = vertices[index+5];

        context.moveTo(x0, y0);
        context.lineTo(x1, y1);
        context.lineTo(x2, y2);
    }

    context.fillStyle = '#FF0000';
    context.fill();
    context.closePath();
};

/*
PIXI.Strip.prototype.setTexture = function(texture)
{
    //TODO SET THE TEXTURES
    //TODO VISIBILITY

    // stop current texture
    this.texture = texture;
    this.width   = texture.frame.width;
    this.height  = texture.frame.height;
    this.updateFrame = true;
};
*/

/**
 * When the texture is updated, this event will fire to update the scale and frame
 *
 * @method onTextureUpdate
 * @param event
 * @private
 */

PIXI.Strip.prototype.onTextureUpdate = function()
{
    this.updateFrame = true;
};

/**
 * Returns the bounds of the mesh as a rectangle. The bounds calculation takes the worldTransform into account.
 *
 * @method getBounds
 * @param matrix {Matrix} the transformation matrix of the sprite
 * @return {Rectangle} the framing rectangle
 */
PIXI.Strip.prototype.getBounds = function(matrix)
{
    var worldTransform = matrix || this.worldTransform;

    var a = worldTransform.a;
    var b = worldTransform.b;
    var c = worldTransform.c;
    var d = worldTransform.d;
    var tx = worldTransform.tx;
    var ty = worldTransform.ty;

    var maxX = -Infinity;
    var maxY = -Infinity;

    var minX = Infinity;
    var minY = Infinity;

    var vertices = this.vertices;
    for (var i = 0, n = vertices.length; i < n; i += 2)
    {
        var rawX = vertices[i], rawY = vertices[i + 1];
        var x = (a * rawX) + (c * rawY) + tx;
        var y = (d * rawY) + (b * rawX) + ty;

        minX = x < minX ? x : minX;
        minY = y < minY ? y : minY;

        maxX = x > maxX ? x : maxX;
        maxY = y > maxY ? y : maxY;
    }

    if (minX === -Infinity || maxY === Infinity)
    {
        return PIXI.EmptyRectangle;
    }

    var bounds = this._bounds;

    bounds.x = minX;
    bounds.width = maxX - minX;

    bounds.y = minY;
    bounds.height = maxY - minY;

    // store a reference so that if this function gets called again in the render cycle we do not have to recalculate
    this._currentBounds = bounds;

    return bounds;
};

/**
 * Different drawing buffer modes supported
 *
 * @property
 * @type {{TRIANGLE_STRIP: number, TRIANGLES: number}}
 * @static
 */
PIXI.Strip.DrawModes = {
    TRIANGLE_STRIP: 0,
    TRIANGLES: 1
};

/**
 * @author Mat Groves http://matgroves.com/ @Doormat23
 * @copyright Mat Groves, Rovanion Luckey
 */

/**
 *
 * @class Rope
 * @constructor
 * @extends Strip
 * @param {Texture} texture - The texture to use on the rope.
 * @param {Array} points - An array of {PIXI.Point}.
 *
 */
PIXI.Rope = function(texture, points)
{
    PIXI.Strip.call( this, texture );
    this.points = points;

    this.vertices = new PIXI.Float32Array(points.length * 4);
    this.uvs = new PIXI.Float32Array(points.length * 4);
    this.colors = new PIXI.Float32Array(points.length * 2);
    this.indices = new PIXI.Uint16Array(points.length * 2);


    this.refresh();
};


// constructor
PIXI.Rope.prototype = Object.create( PIXI.Strip.prototype );
PIXI.Rope.prototype.constructor = PIXI.Rope;

/*
 * Refreshes
 *
 * @method refresh
 */
PIXI.Rope.prototype.refresh = function()
{
    var points = this.points;
    if(points.length < 1) return;

    var uvs = this.uvs;

    var lastPoint = points[0];
    var indices = this.indices;
    var colors = this.colors;

    this.count-=0.2;

    uvs[0] = 0;
    uvs[1] = 0;
    uvs[2] = 0;
    uvs[3] = 1;

    colors[0] = 1;
    colors[1] = 1;

    indices[0] = 0;
    indices[1] = 1;

    var total = points.length,
        point, index, amount;

    for (var i = 1; i < total; i++)
    {
        point = points[i];
        index = i * 4;
        // time to do some smart drawing!
        amount = i / (total-1);

        if(i%2)
        {
            uvs[index] = amount;
            uvs[index+1] = 0;

            uvs[index+2] = amount;
            uvs[index+3] = 1;
        }
        else
        {
            uvs[index] = amount;
            uvs[index+1] = 0;

            uvs[index+2] = amount;
            uvs[index+3] = 1;
        }

        index = i * 2;
        colors[index] = 1;
        colors[index+1] = 1;

        index = i * 2;
        indices[index] = index;
        indices[index + 1] = index + 1;

        lastPoint = point;
    }
};

/*
 * Updates the object transform for rendering
 *
 * @method updateTransform
 * @private
 */
PIXI.Rope.prototype.updateTransform = function()
{

    var points = this.points;
    if(points.length < 1)return;

    var lastPoint = points[0];
    var nextPoint;
    var perp = {x:0, y:0};

    this.count-=0.2;

    var vertices = this.vertices;
    var total = points.length,
        point, index, ratio, perpLength, num;

    for (var i = 0; i < total; i++)
    {
        point = points[i];
        index = i * 4;

        if(i < points.length-1)
        {
            nextPoint = points[i+1];
        }
        else
        {
            nextPoint = point;
        }

        perp.y = -(nextPoint.x - lastPoint.x);
        perp.x = nextPoint.y - lastPoint.y;

        ratio = (1 - (i / (total-1))) * 10;

        if(ratio > 1) ratio = 1;

        perpLength = Math.sqrt(perp.x * perp.x + perp.y * perp.y);
        num = this.texture.height / 2; //(20 + Math.abs(Math.sin((i + this.count) * 0.3) * 50) )* ratio;
        perp.x /= perpLength;
        perp.y /= perpLength;

        perp.x *= num;
        perp.y *= num;

        vertices[index] = point.x + perp.x;
        vertices[index+1] = point.y + perp.y;
        vertices[index+2] = point.x - perp.x;
        vertices[index+3] = point.y - perp.y;

        lastPoint = point;
    }

    PIXI.DisplayObjectContainer.prototype.updateTransform.call( this );
};
/*
 * Sets the texture that the Rope will use
 *
 * @method setTexture
 * @param texture {Texture} the texture that will be used
 */
PIXI.Rope.prototype.setTexture = function(texture)
{
    // stop current texture
    this.texture = texture;
    //this.updateFrame = true;
};

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

/**
 * A tiling sprite is a fast way of rendering a tiling image
 *
 * @class TilingSprite
 * @extends Sprite
 * @constructor
 * @param texture {Texture} the texture of the tiling sprite
 * @param width {Number}  the width of the tiling sprite
 * @param height {Number} the height of the tiling sprite
 */
PIXI.TilingSprite = function(texture, width, height)
{
    PIXI.Sprite.call(this, texture);

    /**
     * The width of the tiling sprite
     *
     * @property width
     * @type Number
     */
    this._width = width || 128;

    /**
     * The height of the tiling sprite
     *
     * @property height
     * @type Number
     */
    this._height = height || 128;

    /**
     * The scaling of the image that is being tiled
     *
     * @property tileScale
     * @type Point
     */
    this.tileScale = new PIXI.Point(1, 1);

    /**
     * A point that represents the scale of the texture object
     *
     * @property tileScaleOffset
     * @type Point
     */
    this.tileScaleOffset = new PIXI.Point(1, 1);
    
    /**
     * The offset position of the image that is being tiled
     *
     * @property tilePosition
     * @type Point
     */
    this.tilePosition = new PIXI.Point();

    /**
     * Whether this sprite is renderable or not
     *
     * @property renderable
     * @type Boolean
     * @default true
     */
    this.renderable = true;

    /**
     * The tint applied to the sprite. This is a hex value
     *
     * @property tint
     * @type Number
     * @default 0xFFFFFF
     */
    this.tint = 0xFFFFFF;

    /**
     * If enabled a green rectangle will be drawn behind the generated tiling texture, allowing you to visually
     * debug the texture being used.
     *
     * @property textureDebug
     * @type Boolean
     */
    this.textureDebug = false;
    
    /**
     * The blend mode to be applied to the sprite
     *
     * @property blendMode
     * @type Number
     * @default PIXI.blendModes.NORMAL;
     */
    this.blendMode = PIXI.blendModes.NORMAL;

    /**
     * The CanvasBuffer object that the tiled texture is drawn to.
     *
     * @property canvasBuffer
     * @type PIXI.CanvasBuffer
     */
    this.canvasBuffer = null;

    /**
     * An internal Texture object that holds the tiling texture that was generated from TilingSprite.texture.
     *
     * @property tilingTexture
     * @type PIXI.Texture
     */
    this.tilingTexture = null;

    /**
     * The Context fill pattern that is used to draw the TilingSprite in Canvas mode only (will be null in WebGL).
     *
     * @property tilePattern
     * @type PIXI.Texture
     */
    this.tilePattern = null;

    /**
     * If true the TilingSprite will run generateTexture on its **next** render pass.
     * This is set by the likes of Phaser.LoadTexture.setFrame.
     *
     * @property refreshTexture
     * @type Boolean
     * @default true
     */
    this.refreshTexture = true;

    this.frameWidth = 0;
    this.frameHeight = 0;

};

PIXI.TilingSprite.prototype = Object.create(PIXI.Sprite.prototype);
PIXI.TilingSprite.prototype.constructor = PIXI.TilingSprite;

PIXI.TilingSprite.prototype.setTexture = function(texture)
{
    if (this.texture !== texture)
    {
        this.texture = texture;
        this.refreshTexture = true;
        this.cachedTint = 0xFFFFFF;
    }

};

/**
* Renders the object using the WebGL renderer
*
* @method _renderWebGL
* @param renderSession {RenderSession} 
* @private
*/
PIXI.TilingSprite.prototype._renderWebGL = function(renderSession)
{
    if (!this.visible || !this.renderable || this.alpha === 0)
    {
        return;
    }

    if (this._mask)
    {
        renderSession.spriteBatch.stop();
        renderSession.maskManager.pushMask(this.mask, renderSession);
        renderSession.spriteBatch.start();
    }

    if (this._filters)
    {
        renderSession.spriteBatch.flush();
        renderSession.filterManager.pushFilter(this._filterBlock);
    }

    if (this.refreshTexture)
    {
        this.generateTilingTexture(true, renderSession);

        if (this.tilingTexture)
        {
            if (this.tilingTexture.needsUpdate)
            {
                renderSession.renderer.updateTexture(this.tilingTexture.baseTexture);
                this.tilingTexture.needsUpdate = false;
            }
        }
        else
        {
            return;
        }
    }
    
    renderSession.spriteBatch.renderTilingSprite(this);

    for (var i = 0; i < this.children.length; i++)
    {
        this.children[i]._renderWebGL(renderSession);
    }

    renderSession.spriteBatch.stop();

    if (this._filters)
    {
        renderSession.filterManager.popFilter();
    }

    if (this._mask)
    {
        renderSession.maskManager.popMask(this._mask, renderSession);
    }
    
    renderSession.spriteBatch.start();

};

/**
* Renders the object using the Canvas renderer
*
* @method _renderCanvas
* @param renderSession {RenderSession} 
* @private
*/
PIXI.TilingSprite.prototype._renderCanvas = function(renderSession)
{
    if (!this.visible || !this.renderable || this.alpha === 0)
    {
        return;
    }
    
    var context = renderSession.context;

    if (this._mask)
    {
        renderSession.maskManager.pushMask(this._mask, renderSession);
    }

    context.globalAlpha = this.worldAlpha;
    
    var wt = this.worldTransform;
    var resolution = renderSession.resolution;

    context.setTransform(wt.a * resolution, wt.b * resolution, wt.c * resolution, wt.d * resolution, wt.tx * resolution, wt.ty * resolution);

    if (this.refreshTexture)
    {
        this.generateTilingTexture(false, renderSession);
    
        if (this.tilingTexture)
        {
            this.tilePattern = context.createPattern(this.tilingTexture.baseTexture.source, 'repeat');
        }
        else
        {
            return;
        }
    }

    var sessionBlendMode = renderSession.currentBlendMode;

    //  Check blend mode
    if (this.blendMode !== renderSession.currentBlendMode)
    {
        renderSession.currentBlendMode = this.blendMode;
        context.globalCompositeOperation = PIXI.blendModesCanvas[renderSession.currentBlendMode];
    }

    var tilePosition = this.tilePosition;
    var tileScale = this.tileScale;

    tilePosition.x %= this.tilingTexture.baseTexture.width;
    tilePosition.y %= this.tilingTexture.baseTexture.height;

    //  Translate
    context.scale(tileScale.x, tileScale.y);
    context.translate(tilePosition.x + (this.anchor.x * -this._width), tilePosition.y + (this.anchor.y * -this._height));

    context.fillStyle = this.tilePattern;

    var tx = -tilePosition.x;
    var ty = -tilePosition.y;
    var tw = this._width / tileScale.x;
    var th = this._height / tileScale.y;

    //  Allow for pixel rounding
    if (renderSession.roundPixels)
    {
        tx |= 0;
        ty |= 0;
        tw |= 0;
        th |= 0;
    }

    context.fillRect(tx, ty, tw, th);

    //  Translate back again
    context.scale(1 / tileScale.x, 1 / tileScale.y);
    context.translate(-tilePosition.x + (this.anchor.x * this._width), -tilePosition.y + (this.anchor.y * this._height));

    if (this._mask)
    {
        renderSession.maskManager.popMask(renderSession);
    }

    for (var i = 0; i < this.children.length; i++)
    {
        this.children[i]._renderCanvas(renderSession);
    }

    //  Reset blend mode
    if (sessionBlendMode !== this.blendMode)
    {
        renderSession.currentBlendMode = sessionBlendMode;
        context.globalCompositeOperation = PIXI.blendModesCanvas[sessionBlendMode];
    }

};

/**
 * When the texture is updated, this event will fire to update the scale and frame
 *
 * @method onTextureUpdate
 * @param event
 * @private
 */
PIXI.TilingSprite.prototype.onTextureUpdate = function()
{
   // overriding the sprite version of this!
};

/**
* 
* @method generateTilingTexture
* 
* @param forcePowerOfTwo {Boolean} Whether we want to force the texture to be a power of two
* @param renderSession {RenderSession} 
*/
PIXI.TilingSprite.prototype.generateTilingTexture = function(forcePowerOfTwo, renderSession)
{
    if (!this.texture.baseTexture.hasLoaded)
    {
        return;
    }

    var texture = this.texture;
    var frame = texture.frame;

    console.log('generateTilingTexture', texture, frame);

    var targetWidth = this._frame.sourceSizeW;
    var targetHeight = this._frame.sourceSizeH;

    var dx = 0;
    var dy = 0;

    if (this._frame.trimmed)
    {
        dx = this._frame.spriteSourceSizeX;
        dy = this._frame.spriteSourceSizeY;
    }

    if (forcePowerOfTwo)
    {
        targetWidth = PIXI.getNextPowerOfTwo(targetWidth);
        targetHeight = PIXI.getNextPowerOfTwo(targetHeight);
    }

    if (this.canvasBuffer)
    {
        this.canvasBuffer.resize(targetWidth, targetHeight);
        this.tilingTexture.baseTexture.width = targetWidth;
        this.tilingTexture.baseTexture.height = targetHeight;
        this.tilingTexture.needsUpdate = true;
    }
    else
    {
        this.canvasBuffer = new PIXI.CanvasBuffer(targetWidth, targetHeight);
        this.tilingTexture = PIXI.Texture.fromCanvas(this.canvasBuffer.canvas);
        this.tilingTexture.isTiling = true;
        this.tilingTexture.needsUpdate = true;
    }

    if (this.textureDebug)
    {
        this.canvasBuffer.context.strokeStyle = '#00ff00';
        this.canvasBuffer.context.strokeRect(0, 0, targetWidth, targetHeight);
    }

    //  If a sprite sheet we need this:
    var w = texture.crop.width;
    var h = texture.crop.height;

    if (w !== targetWidth || h !== targetHeight)
    {
        w = targetWidth;
        h = targetHeight;
    }

    this.canvasBuffer.context.drawImage(texture.baseTexture.source,
                           texture.crop.x,
                           texture.crop.y,
                           texture.crop.width,
                           texture.crop.height,
                           dx,
                           dy,
                           w,
                           h);

    this.tileScaleOffset.x = frame.width / targetWidth;
    this.tileScaleOffset.y = frame.height / targetHeight;

    this.refreshTexture = false;

    this.tilingTexture.baseTexture._powerOf2 = true;

};

/**
* Returns the framing rectangle of the sprite as a PIXI.Rectangle object
*
* @method getBounds
* @return {Rectangle} the framing rectangle
*/
PIXI.TilingSprite.prototype.getBounds = function()
{
    var width = this._width;
    var height = this._height;

    var w0 = width * (1-this.anchor.x);
    var w1 = width * -this.anchor.x;

    var h0 = height * (1-this.anchor.y);
    var h1 = height * -this.anchor.y;

    var worldTransform = this.worldTransform;

    var a = worldTransform.a;
    var b = worldTransform.b;
    var c = worldTransform.c;
    var d = worldTransform.d;
    var tx = worldTransform.tx;
    var ty = worldTransform.ty;
    
    var x1 = a * w1 + c * h1 + tx;
    var y1 = d * h1 + b * w1 + ty;

    var x2 = a * w0 + c * h1 + tx;
    var y2 = d * h1 + b * w0 + ty;

    var x3 = a * w0 + c * h0 + tx;
    var y3 = d * h0 + b * w0 + ty;

    var x4 =  a * w1 + c * h0 + tx;
    var y4 =  d * h0 + b * w1 + ty;

    var maxX = -Infinity;
    var maxY = -Infinity;

    var minX = Infinity;
    var minY = Infinity;

    minX = x1 < minX ? x1 : minX;
    minX = x2 < minX ? x2 : minX;
    minX = x3 < minX ? x3 : minX;
    minX = x4 < minX ? x4 : minX;

    minY = y1 < minY ? y1 : minY;
    minY = y2 < minY ? y2 : minY;
    minY = y3 < minY ? y3 : minY;
    minY = y4 < minY ? y4 : minY;

    maxX = x1 > maxX ? x1 : maxX;
    maxX = x2 > maxX ? x2 : maxX;
    maxX = x3 > maxX ? x3 : maxX;
    maxX = x4 > maxX ? x4 : maxX;

    maxY = y1 > maxY ? y1 : maxY;
    maxY = y2 > maxY ? y2 : maxY;
    maxY = y3 > maxY ? y3 : maxY;
    maxY = y4 > maxY ? y4 : maxY;

    var bounds = this._bounds;

    bounds.x = minX;
    bounds.width = maxX - minX;

    bounds.y = minY;
    bounds.height = maxY - minY;

    // store a reference so that if this function gets called again in the render cycle we do not have to recalculate
    this._currentBounds = bounds;

    return bounds;
};

PIXI.TilingSprite.prototype.destroy = function () {

    PIXI.Sprite.prototype.destroy.call(this);

    if (this.canvasBuffer)
    {
        this.canvasBuffer.destroy();
        this.canvasBuffer = null;
    }

    this.tileScale = null;
    this.tileScaleOffset = null;
    this.tilePosition = null;

    if (this.tilingTexture)
    {
        this.tilingTexture.destroy(true);
        this.tilingTexture = null;
    }

};

/**
 * The width of the sprite, setting this will actually modify the scale to achieve the value set
 *
 * @property width
 * @type Number
 */
Object.defineProperty(PIXI.TilingSprite.prototype, 'width', {

    get: function() {
        return this._width;
    },

    set: function(value) {
        this._width = value;
    }

});

/**
 * The height of the TilingSprite, setting this will actually modify the scale to achieve the value set
 *
 * @property height
 * @type Number
 */
Object.defineProperty(PIXI.TilingSprite.prototype, 'height', {

    get: function() {
        return  this._height;
    },

    set: function(value) {
        this._height = value;
    }

});

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

    if (typeof exports !== 'undefined') {
        if (typeof module !== 'undefined' && module.exports) {
            exports = module.exports = PIXI;
        }
        exports.PIXI = PIXI;
    } else if (typeof define !== 'undefined' && define.amd) {
        define('PIXI', (function() { return root.PIXI = PIXI; })() );
    } else {
        root.PIXI = PIXI;
    }

    return PIXI;
}).call(this);