Re: [Plib-users] Bluey White Screen when running apps

[Steve B. <sjb...@ai...>]

Simon Foster wrote:
> 
> > Can you dive into the Tux/TuxKart source and change
> > the glEnable(GL_FOG) call(s) to glDisable(GL_FOG) ??
> > That'll prove or disprove the Fog theory.
> 
> Ok, I did it with Tux_AQFH and to my great suprise, I
> ran it and there was Tux sitting in his pen! The
> models are all being rendered fine now, except there
> is the problem that is I try to use the menu, the
> screen goes all blue again, and it stays that way
> until I exit the program. On different levels the bg
> colour is different, and on Antechamber the menu just
> looks like someone has scribbled all over the menu. I
> haven't tried Tux Kart yet.

...OK - so when you go to the 'Penguin Hell' level, I'm
betting that the screen goes dark reddish-orange.

That's *definitely* fog.

You may find it goes blue again when Tux dives underwater
too.

So I guess that the work-around of disabling fog is the
one you need - but you maybe missed some place where fog
is modified or something.

We can *DEFINITELY* say that there is a bug in your OpenGL/Mesa
implementation.

> I assume then that this must be a MESA specific
> problem (This ATI card has given me nothing but
> trouble!)

The older ATI cards had a pretty terrible reputation.
The new ATI Radion is supposed to be very good - but the
Linux drivers are pretty new and I don't know how good they
actually are.

Personally, I *LOVE* the nVidia GeForce cards - and since
the GeForce-3 appeared a month or two ago, the prices of
GeForce-2 cards have plummetted.  You should be able to
pick up a GeForce-2 for $120.

Your programs should run 50 times faster than on
those old ATI cards - more if you have a slower CPU.

> However, can you think of any reason why the
> fog effect comes back when I access the menu?

Well, Fog has to be disabled while the menu is being drawn - and
presumably re-enabled again afterwards - so you probably
didn't find *ALL* of the places where fog is set up??

However, that curious 'texturing' I saw in the menu on
your TuxAQFH screenshot - and the break-up of the track
outline in the TuxKart screenshot suggest to me that the
problem is more than just fog...that looked like texture
enable/disable wasn't working right either.

If I had to guess, I'd say it was something broken in the
attribute stack push/pop in PUI...that's just been shown
to be a problem for another version of Mesa on the Voodoo
cards.

This *may* mean that it's a software problem in Mesa - but
I can't tell for sure.
 
----------------------------- Steve Baker -------------------------------
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