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squimmy

SDL - Time since last frame

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I'm playing around with SDL and am trying to find a way to make a TimeSinceLastFrame() kinda function. I've created a function which blits all my stuff to the screen, and to do any smooth movement I need a time since last frame function. this is in c++. I've looked at QueryPerformanceCounter() QueryPerformanceFrequency() but they don't seem to be that accurate. I must be using them wrong. Any help would be appreciated. Thanks.

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Guest Anonymous Poster
Quote:
..QueryPerformanceCounter()
QueryPerformanceFrequency()

but they don't seem to be that accurate. I must be using them wrong...


Well seeing as these as these are windows high resolution counters, I would say so yes.
SDL_GetTicks() or timeGetTime() may well be good enough for this tho.

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Quote:
Original post by Anonymous Poster
Quote:
..QueryPerformanceCounter()
QueryPerformanceFrequency()

but they don't seem to be that accurate. I must be using them wrong...


Well seeing as these as these are windows high resolution counters, I would say so yes.
SDL_GetTicks() or timeGetTime() may well be good enough for this tho.



They work accurate and its NO windows counter. Its the high performance counter on modern mainboards.

squimmy: Show us your code. Nobody can tell you whats wrong if you dont give informations.

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Here's some of the code:



lastFrameTime = thisFrameTime;
QueryPerformanceCounter(&count);
time = ((double)count.QuadPart/(double)freq.QuadPart);
thisFrameTime = time;





lastFrameTime,thisFrameTime and time are all double, they are all set up in a constructor.

I have a method called getTimeEllapsed which has:

return (thisFrameTime - lastFrameTime);


I get very strange results from it so I've obviously done something wrong, and I obviously don't understand something.


Help is very much appreciated.

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