RE: [AD] vsync and SVGAlib (was Problems: Grabber and windowing)

["Matt Witherspoon" <spoon@xxxxxxxxxx>]

  No no, this is exactly what I'm saying too :) (sorry I was unclear...).
However, if you noticed earlier when I first mentioned this problem, some
people told me that show_video_bitmap does not guarantee vsync. That is
because the docs do say "This function will wait for a vertical retrace **if
the graphics card requires it**."  If in must wait for a vsync then how
about saying "This function will wait for a vertical retrace." Instead of
this 'if requires' confusion.

   --Matt Witherspoon

-----Original Message-----
From: alleg-developers-admin@xxxxxxxxxx
[mailto:alleg-developers-admin@xxxxxxxxxx Behalf Of Eric
Botcazou
Sent: Tuesday, January 21, 2003 8:02 AM
To: alleg-developers@xxxxxxxxxx
Subject: Re: [AD] vsync and SVGAlib (was Problems: Grabber and windowing)

But it has the opposite behavior: show_video_bitmap()/scroll_screen() are
used for page flipping and _must_ both wait for the vertical retrace, while
request_video_bitmap()/request_scroll() are used for triple buffering and
_must_ both not wait for the vertical retrace (otherwise, triple buffering
is not supported).