Animation timing

[TB-Rex]

This is no real OpneGL problem but I thing it is near enoth to write it on this board.

I know how to time my animation. But there are some questions about the timer functions in C++. Is clock(); the best way to get the acurate time in ms?

I think clock(); returns the time while my EXE is running in ms. Right?

Are there better functions?
How acurate are the timers under Win9x?

Thanks for every replies.

[DFrey]

In Windows, the message driven timers are extremely inaccurate. I've never used clock() for timing so I don't know how well it behaves under Windows. For maximum accuracy and precision under Windows, use the high performace counter by way of QueryPerformanceCounter(...) and QueryPerformanceFrequency(...).
I've also used GetTickCount() for a fairly accurate timer, but only to millisecond precision.

There is no STANDARD high-resolution timer
in C/C++.

If you're using Windows, QueryPerformanceCounter()
is the way to go.
If you're using BeOS, the microsecond timer
used for kernel scheduling is available as
system_time().
If you're using some UNIX derivative, you
can set up your own high-resolution timer
using setitimer() and later read it with
getitimer().

[TB-Rex]

Thanks Thanks Thanks Thanks!

Now I've got my floating animation. It had been the **** ****ing clock() function. QueryPerformanceCounter() is much better. And again: Thanks for this tip.

[This message has been edited by TB-Rex (edited 10-31-2000).]