Re: [Dev-C++] FPS counter?

[JS <jsc...@gm...>]

Well you may use the timeticks as described in an email before -

but you will have to integrate several ticks in order to get a clear 
value :

I would reset a frames counter to zero and save the number of ticks
into startticks

then wait at least 100 frames - and read the ticks counter
and store a new starttickvalue

FPS =3D 100 *1000 * 10 / (newtickvalue - starttickvalue)

100 frames * 1000 millis * 10 accuracy factor

why do i explain this easy math ? - well

100 frames should be used for precision / accuracy :

windows reports not the real ticks - but a difference of some 
milliseoncs. taking only the ticks between one frame would lead to 
inacurate values.

100 is a good choice / compromise bettween accurr. and speed.

if your app leads to nuch less then 100 frames per second - the 
value might be reduced -

try to obtain at least around 1000 ticks

after having calculate a new actual FPS value , perform a 
smoothing :

average =3D average - (average >> 2) + (newvalue >> 2)

where 2 or more (up to eg 5) increases smoothing


after this



oldvalue =3D oldvalue - (oldvalue >> 2) + (newvalue >> 2)

 value 2 above is dynamic hysteresis and avoids toggling
(might be up to  4, where larger means quicker !!!)


if ((average > (oldvalue + 4) or (average < (oldvalue - 4) )-> 
	oldvalue =3D average;
	screenupdate using average / 10;


 value 2 above is static hysteresis and avoids toggling
(might be up to  4, where smaller means quicker)


remember :

value avarage / 10 ist the real FPS -> see accuracy factor


j=FCrgen



On 25 Sep 2001, at 23:00, Stein Nyg=E5rd wrote:

> Hi all...
> 
> I's been a while, cause I've been busy setting up my new Athlon 1400mhz.
> It's working great, so now I'm ready to move on with the OpenGL!
> So, I just can't figure out how to make a good, fast and precise
> FramesPerSecond-Counter. Any suggestions?
> Thanks!
> 
> Stein
> 
> 
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