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To: Soren Schmidt <sos@freebsd.dk>
Cc: doconnor@gsoft.com.au (Daniel O'Connor), current@FreeBSD.ORG,
yokota@zodiac.mech.utsunomiya-u.ac.jp (Kazutaka YOKOTA),
mike@smith.net.au (Mike Smith)
Subject: Re: vga driver and signal
In-reply-to: Your message of "Fri, 05 Nov 1999 08:19:07 +0100."
<199911050719.IAA54980@freebsd.dk>
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Date: Thu, 04 Nov 1999 23:44:51 -0800
From: Amancio Hasty <hasty@rah.star-gate.com>
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> It seems Amancio Hasty wrote:
> > =
> > Just trying to prevent dragging the whole X server to the kernel --
> > Actually dragging the whole X server to the kernel is not a bad
> > idea --- however it is something that I can not afford to do right no=
w :(
> =
> Ahh, horror, Terry's old idea is coming back again :)
Actually is my old idea not Terry's.
> Seriously, you need (at least) all the code that deals with the videoHW=
> on the interrupt in the kernel, there is no way to get this to userland=
> reliably and without significant delay. This will drag in most off the
> ddx layer I'm afraid, so its really not practical.
> =
> Lets step back for a moment, this is clearly the wrong solution to
> everything, what exactly is it you want to do or want to accomplish??
> Lets see if we can come up with another way of doing that...
Okay,
The problem that the XFree86 group is trying to solve is that
when a user moves an opaque window it gets little tearings =
along the edges because the repaint of the window came in
in the middle of a vertical retrace also moving the window
is not that smooth. Apparently, the Accel-x folks have solved
this problem because according to some their X server
does not have any problems in moving opaque windows.
As Kevin Day, just posted this problem has other applications
for instance dedicated video players .
One solution that the XFree86 folks are trying is to sync up =
the mouse interrupts to the refresh rate. =
Mark Vojkovich <mvojkovich@varesearch.com> has reported
good success with this approach however the problem is that
we can not arbritraly set the mouse interrupt rate like we can =
with a vga card.
Actually, what we need is a dialogue between the XFree86 group
and this group . For now , I can serve as the bridge and it gets
too involved then we will have to cross-post between the =
two groups.
-- =
Amancio Hasty
hasty@rah.star-gate.com
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