Message-ID:	<1.5.4.32.19970424055459.00692f70@ubeclu.unibe.ch>
MIME-Version:	1.0
Date:	Thu, 24 Apr 1997 07:54:59 +0200
To:	tgrand AT canvaslink DOT com
From:	Roger Noss <noss AT pupk DOT unibe DOT ch>
Subject:	Re: timer interrupt - sample code anyone?
CC:	djgpp AT delorie DOT com

At 02:57 PM 4/23/97 -0400, you wrote:

>Ok, I have a system of measuring the frame rate in my game that I
>think is pretty foolproof.  I have a variable called frame_count that
>is incremented at the end of every frame.  I then have an ISR which
>is called once per second.  In this ISR, I copy frame_count into
>a variable called fps, then I set frame_count back to 0.
>
>	Tom Grandgent

And how do you detect the end of every frame?  From VGA specs I found on the
Web I read that bit 3 of 0x3CA is set during vertical retrace but I have not
been able to capture it.  Am I barking up the wrong tree?  Is there a
function in djgpp or Allegro that does this with less effort?

Roger Noss

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