class AbstractMaskSystem {
  /**
   * @param renderer - The renderer this System works for.
   */
  constructor(renderer) {
    this.renderer = renderer, this.maskStack = [], this.glConst = 0;
  }
  /** Gets count of masks of certain type. */
  getStackLength() {
    return this.maskStack.length;
  }
  /**
   * Changes the mask stack that is used by this System.
   * @param {PIXI.MaskData[]} maskStack - The mask stack
   */
  setMaskStack(maskStack) {
    const { gl } = this.renderer, curStackLen = this.getStackLength();
    this.maskStack = maskStack;
    const newStackLen = this.getStackLength();
    newStackLen !== curStackLen && (newStackLen === 0 ? gl.disable(this.glConst) : (gl.enable(this.glConst), this._useCurrent()));
  }
  /**
   * Setup renderer to use the current mask data.
   * @private
   */
  _useCurrent() {
  }
  /** Destroys the mask stack. */
  destroy() {
    this.renderer = null, this.maskStack = null;
  }
}
export {
  AbstractMaskSystem
};
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