Accurately measuring time (primarily for calculating the frame rate)

Quick question that I suspect has an obvious answer that I've overlooked: How can I accurately measure the passage of time on Wii? I previously used SDL_GetTicks (which returns the number of milliseconds that have passed since SDL was initialized) but that isn't an option when I'm not using SDL.

I use ticks_to_millisecs(gettime()); from the #include ogc/lwp_watchdog.h library in devkitpro. I don't know much else about it though.



Edited 1 time(s). Last edit at 05/20/2011 09:57AM by owen.

I think the "gettimeofday" function is a good alternative. It's pretty portable (mingw, linux, wii) and gives time as accurate as possible. (up to microseconds)

Here's what I've used in the past.

Uint64 get_tick_count()
{
	const Uint64 ticks = gettime();
	const Uint64 ms = ticks / TB_TIMER_CLOCK;
	return ms;
}

Edited 1 time(s). Last edit at 05/20/2011 05:17PM by scanff.

thanks everyone :)

Just take care with anything that might use time_t as at machine level it’s defined as long. ( so something may return u64, but internally uses far less resolution)

Can’t remember exactly but when I tried the library supplied timer methods, think it was somewhere around 15 seconds before time wrapped around.

This caught me out big time in my timer even code!

To get a true u64 high resolution timer for the Wii see nukes code… [wiibrew.org]

Quote
Titmouse
To get a true u64 high resolution timer for the Wii see nukes code… [wiibrew.org]

Ugh. Please don't introduce some external(obscure) dependency to your code just to reimplement something that is already in libogc - gettime() uses the same code and is definitely "true u64 high resolution".

D'oh, gettime() does indeed give exactly the same u64 results, nice (I problably used something like time() in the past).