SFML community forums
Help => Window => Topic started by: Zhiren on June 14, 2014, 10:20:41 am
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I am writing a game and set the frame rate limit to 60 FPS. However the frames actually run at about 30 FPS. So I just am curious why that is. If I set the Vsync on and turn off the limit, it runs at 60. Would this change from computer to computer with different refresh rates? Also, I probably shouldn't be putting timed events based on a frame count should I? I probably should use the built in Time functions, right?
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Would this change from computer to computer with different refresh rates?
Yes. Also different processor speeds and OS scheduling behavior.
Also, I probably shouldn't be putting timed events based on a frame count should I? I probably should use the built in Time functions, right?
Yes. A frame is not a unit of time.
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Game logic should not depend on the actual time passed in a frame, otherwise you get non-deterministic and non-reproducible behavior. The typical approach is to let the logic run at a constant rate independent of the frame rate, and adapt the graphics dynamically. Fix your timestep (http://gafferongames.com/game-physics/fix-your-timestep/) is a more sophisticated article on that topic, there have also been several forum discussions in the past.