function RenderTexture(baseRenderTexture, frame) {
        var _this = _super.call(this, baseRenderTexture, frame) || this;
        _this.valid = true;
        _this.filterFrame = null;
        _this.filterPoolKey = null;
        _this.updateUvs();
        return _this;
    }
@param baseRenderTexture - The base texture object that this texture uses.
@param frame - The rectangle frame of the texture to show.