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c++frame-rate

C++: Calculating Moving FPS

I would like to calculate the FPS of the last 2-4 seconds of a game. What would be the best way to do this?

Thanks.

Edit: To be more specific, I only have access to a timer with one second increments.

Solution

  • Near miss of a very recent posting. See my response there on using exponential weighted moving averages.

    C++: Counting total frames in a game

    Here's sample code.

    Initially:

    avgFps = 1.0; // Initial value should be an estimate, but doesn't matter much.

    Every second (assuming the total number of frames in the last second is in framesThisSecond):

    // Choose alpha depending on how fast or slow you want old averages to decay.
// 0.9 is usually a good choice.
avgFps = alpha * avgFps + (1.0 - alpha) * framesThisSecond;