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POI can't figure out why this fps counter is inaccurate
 

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  1. POI can't figure out why this fps counter is inaccurate
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    <p>I'm trying to track frames per second in my game. I don't want the fps to show as an average. I want to see how the frame rate is affected when I push keys and add models etc. So I am using a variable to store the current time and previous time, and when they differ by 1 second, then I update the fps.</p> <p>My problem is that it is showing around 33fps but when I move the mouse around really fast, the fps jumps up to 49fps. Other times, if I change a simple line of code elsewhere not related to the frame counter, or close the project and open it later, the fps will be around 60. Vsync is on so I can't tell if the mouse is still effecting the fps.</p> <p>Here is my code which is in an update function that happens every frame:</p> <pre><code>FrameCount++; currentTime = timeGetTime (); static unsigned long prevTime = currentTime; TimeDelta = (currentTime - prevTime) / 1000; if (TimeDelta &gt; 1.0f) { fps = FrameCount / TimeDelta; prevTime = currentTime; FrameCount = 0; TimeDelta = 0; } </code></pre> <p>Here are the variable declarations:</p> <pre><code>int FrameCount; double fps, currentTime, prevTime, TimeDelta, TimeElapsed; </code></pre> <p>Please let me know what is wrong here and how to fix it, or if you have a better way to count fps. Thanks!!!!!!</p> <p>I am using DirectX 9 btw but I doubt that is relevant, and I am using PeekMessage. Should I be using an if else statement instead? Here is my message processing loop:</p> <pre><code>MSG msg; ZeroMemory (&amp;msg, sizeof (MSG)); while (msg.message != WM_QUIT) { if (PeekMessage(&amp;msg, NULL, 0, 0, PM_REMOVE)) { TranslateMessage (&amp;msg); DispatchMessage (&amp;msg); } Update (); RenderFrame (); } </code></pre>
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    1. COThe answer to this is going to depend on how you are generating your frames and where this code is in your render loop.
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