IDirect3DRMDevice::SetBufferCount

HRESULT SetBufferCount(DWORD dwCount);

Sets the number of buffers currently being used by the application.

·Returns D3DRM_OK if successful, or an error otherwise. For a list of possible return codes, see Direct3D Retained-Mode Return Values.

dwCount

Specifies the number of buffers—one for single-buffering, two for double-buffering, and so on. The default value is 1, which is correct only for single-buffered window operation.

An application that employs double-buffering or triple-buffering must use this method to inform the system of how many buffers it is using so that the system can calculate how much of the window to clear and update on each frame.