在directx中如何设置垂直同步

来源：互联网发布：哈萨克软件大全编辑：程序博客网时间：2024/04/29 05:18

在使用CreateDevice创建设备时，设置参数D3DPRESENT_PARAMETERS中的PresentationInterval为D3DPRESENT_INTERVAL_ONE或者D3DPRESENT_INTERVAL_DEFAULT，表示在绘图是使用Present操作时，会等待在垂直重扫完毕以后，进行front buffer的切换（若检测到垂直同步完毕，则马上flip调换frontbuffer和backbuffer）。这样，画面的帧率就不会超过显示器（显卡）的刷新率，一般为60HZ。

SDK文档原话：The driver will wait for the vertical retrace period (the runtime will "beam follow" to prevent tearing).Present operations will not be affected more frequently than the screen refresh; the runtime will complete at most one Present operation per adapter refresh period. This is equivalent to using D3DSWAPEFFECT_COPYVSYNC in DirectX 8.1. This option is always available for both windowed and full-screen swap chains.