I'm writing a game, and I noticed the framerate is not stable. What basic logic do I need to limit the framerate of my game reliably? How do I calculate the sleep time?
I know how long it took to update the game one frame in microseconds and of course the frame rate (in frames per second (FPS)) I want to reach.
The number of microseconds per frame is 1000000 / frames_per_second. If you know that you've spent elapsed_microseconds calculating, then the time that you need to sleep is:
(1000000 / frames_per_second) - elapsed_microseconds