Fast timer, NOT win32
Author
I am programming a 3D engine to support multiple OS''s. So, for Win32 I can use timeGetTime(), etc.
But what would I use in Linux? clock() is waaaay too slow! Completely stumped.
I''d be very greatful for some info on this. Thanks
Author
So ASM is the only way? OK I suppose I could handle that. Strange though that there''s not a nice standard C func for that....
Thanks a lot
Thanks a lot
Have you had a look what's in the Linux time.h header? Some of the functions there might be of use to you.
--
Very simple ideas lie within the reach only of complex minds.
Edited by - SabreMan on February 17, 2002 9:22:47 AM
--
Very simple ideas lie within the reach only of complex minds.
Edited by - SabreMan on February 17, 2002 9:22:47 AM
Author
Why, is the time.h header different for Linux than for Windows? I thought it was a standard C header.
quote:Original post by dusik
Why, is the time.h header different for Linux than for Windows? I thought it was a standard C header.
Whoops, yes. I was working from memory which often isn''t the most accurate of techniques. Especially when I haven''t used the header in question for over a year!
--
Very simple ideas lie within the reach only of complex minds.
i would create a simple function, inline probably. along the lines of this:
then you would use it by first creating a timer variable and then calling the checktimer() to see if the timer had occured:
(http://www.ironfroggy.com/)
(http://www.ironfroggy.com/pinch)
int checktimer(long timer) { if (timer <= time()) { return 1; } return 0;} then you would use it by first creating a timer variable and then calling the checktimer() to see if the timer had occured:
long timer = time() + 1000; // set a timer for in a secondwhile (checktimer(timer) == 0) { }printf("Second is over.\n"); (http://www.ironfroggy.com/)
(http://www.ironfroggy.com/pinch)
Author
I still don''t see, though, how this would allow me to calculate, say, frames per second. Say, I''ve got 100 FPS. That means, each frame takes 10 milliseconds to render. So I would do something like:
That is similar to what I''ve got now (though simplified) but instead of time() I use timeGetTime() using the Win32 API. The reason is, timeGetTime is accurate to 1 millisecon, which is what I need, whereas the functions in (clock(), time()) are way too inaccurate.
Also, if I''m not mistaken, ironfroggy, the code you wrote is a delay, not a measure of time. I need to measure how much time the frame has been rendering, not pause the programme for any amount of time.
But thanks anyway.
void TimerTick(){ static long prevtime = time(); long currtime = time(); g_FPS = (1.0f / (float)(currtime-prevtime)); prevtime = currtime;} That is similar to what I''ve got now (though simplified) but instead of time() I use timeGetTime() using the Win32 API. The reason is, timeGetTime is accurate to 1 millisecon, which is what I need, whereas the functions in (clock(), time()) are way too inaccurate.
Also, if I''m not mistaken, ironfroggy, the code you wrote is a delay, not a measure of time. I need to measure how much time the frame has been rendering, not pause the programme for any amount of time.
But thanks anyway.
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