function RenderTexturePool(textureOptions) {
        this.texturePool = {};
        this.textureOptions = textureOptions || {};
        this.enableFullScreen = false;
        this._pixelsWidth = 0;
        this._pixelsHeight = 0;
    }
@param textureOptions - options that will be passed to BaseRenderTexture constructor
@param {PIXI.SCALE_MODES} [textureOptions.scaleMode] - See {@link PIXI.SCALE_MODES} for possible values.