Re: Grabbing the pointer with OpenGL

["Mark Collins" <me@thisisnurgle.org.uk>]

Can you *please*stop hitting 'reply to all'?

====
The Infamous Mark 'Nurgle' Collins
Lead Author - 'Linux Game Programming' (ISBN: 0-7615-3255-2)
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----- Original Message -----
From: Mads Bondo Dydensborg <madsdyd@challenge.dk>
To: <linuxgames@sunsite.dk>
Cc: Linux Games <linuxgames@sunsite.auc.dk>
Sent: Friday, April 13, 2001 11:17 AM
Subject: Re: Grabbing the pointer with OpenGL


> On Thu, 12 Apr 2001, Steve Baker wrote:
>
> > > > > I warp the pointer in the glut callback function. (And sets a flag
to
> > > > > avoid endless loops - is there a smarter way to avoid this?)
> > > >
> > > > The glut *render* callback - right?
> > >
> > > No, actually in the callbacks from glutPassiveMotionFunc and
> > > glutMotionFunc. I choose this, to try an keep the mouse at the center.
> >
> > Hmmm - I wonder if that could be a part of your problem.
> >
> > Try it in the render callback.
>
> OK, I will. Although I fail to grasp why it should make a difference. It
> makes it a bit harder to avoid looping, I think.
>
> >
> > > But this is software rendering. And, I do not cull to the viewfrustrum
(I
> > > read all your faqs, btw ;-) yet.
> >
> > If you are truly intending to stick with software rendering, I wouldn't
spend
> > too much time on view frustum culling. Probably 90% or more of your CPU
time is
> > going into filling pixels - and hence any effort spent on optimising the
rest of
> > the code can at most get you a few percent frame rate increase.
>
> I do not intend on software rendering, it is just that my 3d hardware can
> not render to a window, and it is often convenient to run the program in a
> window. I understand that people that have DRI support often run in a
> window, and I would like to test my program running as such.
>
> >
> > Instead, look into techniques like portal culling that reduce the number
of
> > pixels that you draw that are actually only going to be tossed out by
Z-buffer
> > culling.
> >
> The stuff I am rendering is a terrain. I was under the impression that
> portal techniques were not very appropiate for outdoor rendering? I intend
> to implement something like ROAM eventually.
>
> > Personally, I think it's time to dump software rendering.  You can pick
up
> > really amazing 3D hardware for virtually nothing these days.  One small
hit
> > on your credit card and you have a 50x speedup.
>
> I do not want to bore you with the details of my system or my economy or
> the fact that my wife need 50 pairs of shoes (at least it seems that way
> :-). Upgrading only the videocard is not really an option - there are no
> AGP bus in this system, and I do not want to buy a highend video card with
> a PCI bus. Very quickly I will be looking at $1000 and basically have to
> upgrade 80 % of my system (no SDram slots either, btw, and I do not own a
> ATX cabinet, and so on).
>
> For now, I will simply assume that the low Hz is the reason, and not mind.
>
> Thanks,
>
> Mads
>
> --
> Mads Bondo Dydensborg.                               madsdyd@challenge.dk
> Microsoft's stance in this brouhaha is, of course, hypocritical to the
> point of being nauseating.
>     -     Eric S. Raymond on MS's demand that AOL use open protocols for
IM
>
>
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