code: func (ml MetalLayer) SetDisplaySyncEnabled(enabled bool) {
  	switch enabled {
  	case true:
  		C.MetalLayer_SetDisplaySyncEnabled(ml.metalLayer, 1)
  	case false:
  		C.MetalLayer_SetDisplaySyncEnabled(ml.metalLayer, 0)
  	}
  }
docs: // SetDisplaySyncEnabled controls whether the Metal layer and its drawables
  // are synchronized with the display's refresh rate.
  //
  // Reference: https://developer.apple.com/documentation/quartzcore/cametallayer/2887087-displaysyncenabled.