[CSC 415] Computing FPS

[Timothy Herold]

Hello everyone,

I did a little research and I think this is the way to go for computing our
frames per second easily.

GLUT has a built in value for GLUT_ELAPSED_TIME which records the number of
milliseconds since the last call to glutInit().

So here's what we do.

// frames: the number of frames since FPS was last calculated
// time: the current time elapsed
// time2: the time elapsed since FPS was last calculated
int fps, frames, time, time2;

frames=0;
time=0;

// put the following into the idle function

frame++;
time=glutGet(GLUT_ELAPSED_TIME);
if ( time - time2 > 1000 ) {   // or however often we want to update FPS
    fps = frames * 1000.0 / ( time - time2 );
    time = time2;
    frames = 0;
}

and voila, FPS without using system calls for time.

-- 
Timothy Herold
timothy.herold at gmail.com
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