Re: Ada, games and frame rate calculation

[Simon Wright <simon@pushface.org>]

tmoran@acm.org writes:

> > GNAT, IIRC, has an accuracy of 1 ns, so 0.0333 is going to be a lot
>   Type Duration has a small 'small, but the Windows Performance Counter
> only ticks (approximately) every 1/nth of a microsecond, where n = 3 on
> the machine I'm using now.  So two successive clock reads, if they don't
> give the same value, will differ at least by 300 or so nanoseconds.
>   You may want to look up "Time the Clock" on AdaPower.

The Booch Components (http://www.pushface.org/components/bc/) contain
an i86 high-res clock. On i86 the resolution is the timestamp counter,
ie basically the clock rate; I have a PowerPC implementation (but I
don't own the copyright), using the timebase, which has a coarser
resolution -- but 40 ns ain't bad!

-- 
Simon Wright                               100% Ada, no bugs.