FpsManager – A C++ helper class for framerate independent movement

Update – September 2013: Fixed an issue whereby the enforceFPS function only returned the time it took to run the enforceFPS function itself because I forgot to add the frameDuration. Fixed another issue where I reset the frameCount to 1 when it should have been reset to 0. Oops…


I wrote only a few months back that I didn’t want to write another piece of FPS code, ever. But this was before I started taking framerate independent movement seriously. In my past coding I’ve just enabled VSync and been done with it – as long as the machine had enough processing capacity to perform at 60fps everything was fine, and nearly everything I wrote was so simple that it didn’t task the box too much.

However, as I’ve been working on a lot of Android code recently where the processing capacity of the device can easily vary by orders of magnitude, I’ve started thinking more that I really need to be able to cater to framerate changes gracefully. And for this, I’ve reinvented the wheel – if only to be absolutely sure in no uncertain terms about how the wheel frickn’ works.

So to put this to the test, I wrote the FpsManager class, and rewrote the camera from my old post on Simple OpenGL FPS Controls into a proper class suitable for reuse in multiple projects and capable of working in a framerate independent manner. That’s the next post…

…first things first: The FpsManager! ;-)

FpsManager.hpp

Comments? Suggestions? Think I’ve designed it badly, or quite well? Know why it works just fine (from a usability standpoint) but provides a framerate just under that requested?

Feel free to let me know in the comments below! Cheers! =D