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Topic on Glossary talk:Vertical sync (Vsync)

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From the sounds of things the game uses the "1" / "2" value directly as the SyncInterval.

Long story short:

  • 0 - The presentation occurs immediately, there is no synchronization.
  • 1 through 4 - Synchronize presentation after the nth vertical blank.

In a sense, "1" and "2" don't necessarily have to have anything to do with the number of buffers being used. 1 means that a new frame will be presented on every "refresh" of the monitor, while 2 means a new frame will be presenter on every second "refresh" of the monitor.

If you'd use "1" on a 60 Hz monitor, you'd get a 60 FPS cap. If you'd use "2" on a 60 Hz monitor, you'd get a 30 FPS cap.

A lot of console games that are locked to 30 FPS output synchronizes the presentation to every second refresh of the monitor.