[CSC 415] Locking the Frame Rate

[Andrew J. Pounds]

I have been experimenting with the GLFW timers and have come up with a 
workable solution for locking the frame rates to a desired value 
(something we must have in order to get the physics to display correctly).

First:  you need to set glfwSwapInterval to ZERO.  If you have it set at 
one, it will lock you framerate a 60fps.

Second: you need a function to lock your framerate to a desired value.  
Here is one I wrote:

void glfwLockFrameRate( float desiredFrameRate ){

      double secondsToWait = 1.0 / desiredFrameRate;
      double startTime = glfwGetTime();
      do { /* twiddle thumbs */ }
      while ( glfwGetTime() - startTime < secondsToWait );
}

Now, my home system is running at about 4000 FPS on my code, so I cannot 
set the framerate above that.  But if I wanted to lock the framerate at 
120 FPS I could simply call

       glfwLockFrameRate(120);

in the code.  I put this in my main just before calling the display 
function.   The next trick (and this will have to wait until I get back 
from my trip)  is to show you how do determine what framerate you need.


-- 
*/Andrew J. Pounds, Ph.D./*
/Professor of Chemistry and Computer Science/
/Director of the Computational Science Program/
/Mercer University, Macon, GA 31207 (478) 301-5627/
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