Path: chuka.playstation.co.uk!news
From: Developer Support <dev_support@interactive.sony.com>
Newsgroups: scea.yaroze.programming.2d_graphics,scee.yaroze.programming.2d_graphics
Subject: System timers
Date: Wed, 28 May 1997 17:43:32 +0100
Organization: Sony Computer Entertainment Europe
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Message-ID: <338C60B4.6490@interactive.sony.com>
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Developer Support wrote:
> As for system timers there are 3 functions long StartRCnt(unsigned
> long), long ResetRCnt(unsigned long) and long GetRCnt(unsigned long).
> The only values that do anything in the calls are 0,1 and 2. 0 and 2
> seem to be pixel counts (time to draw a pixel, or of that order, there
> isn't much in the way of details on how they were set up), and 1 seems
> to be a scanline count.
> 
> To use the root counters just call StartRCnt with the number you want.
> ResetRCnt as necessary and GetRCnt to get a value. The value returned is
> in the range 0-65535, after which the counters wrap around.
> 
> Example
> 
> #include <libps.h>
> 
> void main()
>    {
>    unsigned long counter;
> 
>    counter = 0;   // could also be 1 or 2
> 
>    StartRCnt(counter);
> 
>    while(*program terminate condition*)
>       {
>       ResetRCnt(counter);
> 
>       *all the code*
> 
>       printf("Time taken: %d\n",GetRCnt(counter));
>       }
>    }
> 
> Stuart


I've just been told that timer 0 can fail some times, and timer 1 is
used internally (VSync(1) uses it, so its best not to reset it). This
leaves timer 2, which doesn't seem to have any problems associated with
it.

Stuart