_updateDrawingBufferSize(width, height, pixelRatio) {
    const renderer = this._threeRenderer
    renderer.getSize(tmpVec2)
    if (tmpVec2.width !== width || tmpVec2.height !== height || renderer.getPixelRatio() !== pixelRatio) {
      renderer.setDrawingBufferSize(width, height, pixelRatio)
    }
  }
Update the renderer's drawing buffer size
@protected