From: Chris Chuter (cchuter++at++yahoo.com)
Date: 02/16/2000 08:19:49
Now hold on there. I'll admit I'm a little ingnorant on xinerama (I'll know
more when I get it running my Linux box - XFree86 4.0). But, I think you're
trivializing the problem. It's not just an origin reset in most cases - you
actually lose XEvent information when crossing screens - try this with perfly
on a dual screen.
load an object
Do a motion event that crosses the screen (i.e. hold the 1st button down and
cross the screen)
What you'll see is that the object gets bad x,y data, but what's worse is that
it doesn't update the x,y as you keep performing the motion event. This is bad.
Here's some printf output of the Motion event to prove it:
mouseMoved: x:1273, y:471 same screen:1
mouseMoved: x:1276, y:471 same screen:1
mouseMoved: x:1277, y:471 same screen:1
mouseMoved: x:1278, y:471 same screen:1
mouseMoved: x:1279, y:471 same screen:1
mouseMoved: x:0, y:1024 same screen:0
mouseMoved: x:0, y:1024 same screen:0
mouseMoved: x:0, y:1024 same screen:0
mouseMoved: x:0, y:1024 same screen:0
mouseMoved: x:0, y:1024 same screen:0
You don't get correct x,y values unless you release the button and re-pick.
This is a major pain for Performer programs that use a lot of picking (like
ours).
I agree with your other point 'Multipipe performer scales well', thats why
we're here ;)
If you have any solutions to the above problems, I'm all ears. Otherwise, I
anxiously await SGI's move to X11R6.4 or I'll do some porting to Linux.
-chris
--- Angus Dorbie <dorbie++at++sgi.com> wrote:
> Well it might add a few problems of it's own.
>
> The xinerama stuff AFAIK is a single stream of input.
>
> The origin reset is easily fixed in software by tracking input window
> and the multipipe performance scales well fairly transparently with
> performer, that's one of the huge advantages of using Performer.
>
> Carefull what you wish for.
>
> Cheers,ANgus.
>
> Chris Chuter wrote:
> >
> > Are there any plans for SGI to upgrade to X11R4 or higher in the future?
> We've
> > been sitting on X11R3 for a while. X11R4+ promises Xinerama which would
> solve
> > many of the multiple head problems (mouse x,y getting reset, dragging
> windows
> > across, etc.).
> >
> > -chris
> >
=====
Chris Chuter
Software Engineer
Mojave Computer Graphics
cchuter++at++texas.net
http://www.texas.net/~cchuter/
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