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Timing

Started by Sappharos Mar 21, 2009 at 8:21 AM 1 reply 900+ views

Original Post

Mar 21, 2009 at 8:21 AM

I'm trying to find a neat and reliable method for making an OpenGL program run at precisely 60 fps, while allowing for a frame-rate display. I've tried searching, but every site I've found gives a different method, and none of these seem to be ideal. The official OpenGL site recommends GLUT, but I'm reluctant to use this unless it's absolutely necessary. Could anyone give some advice please? Thanks.

razorjack

Mar 21, 2009 at 9:58 AM

It's maybe this v-synch you can enable or disable.
Take a look at: http://www.devmaster.net/forums/showthread.php?t=443

AndyEsser

108

AndyEsser

Mar 22, 2009 at 3:14 AM

Although this isn't 100% precise (you will never get a 100% precise timer), the way that I implement a framerate limiter is:

1. Start Timer before Rendering
2. Render
3. After rendering, check Timer, if time elapsed < (1000 / 60) then loop
4. When time elapsed > (1000 / 60) then move onto next frame

You can also implement it slightly more accurately by altering (1000 / 60) to represent the actual time and frames left in that second, so if your first frame took 24ms then the 2nd frames calculationg should be (976 / 59) to get the correct frame time.

Hope this helps

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