Re: [Plib-devel] Texture and blend modes

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

"Curtis L. Olson" wrote:

> Question ... in the man page GL_DEPTH_TEST and GL_FOG are both listed
> under multiple "bits".  Does this mean I can pick one or the other?
> Do I need all of them?

One or the other.

They are supposedly grouped into 'helpful' subsets of the full OpenGL state
because there is generally some cost to doing a push/pop for some of the
attributes - so it's best to deal with the MINIMUM set.
 
> The prototype for glPopAttrib() is "void glPopAttrib( void )".  My
> understanding is that it just takes the top thing off the stack and
> restores which ever states had been previously pushed there.

Yes.
 
> My code doesn't work though ... this could be due to:
> 
> a) my misunderstanding of how these things really work.
> 
> b) $#@$#@ mesa bugs
>    ^^^^^^ -> is this ok for the .mil filter? :-)

Yes - so long as you don't say things like "President Assassination
Bomb Threat Terrorism Iraq" because that sets off their autodetection
circuits and forces some hapless individual to have to *read* the mail
personally.

<wave> Hi! </wave>

   :-)
 
> But, I haven't seen mesa break this badly before so perhaps (a) is
> more likely?

Well, as I explained in my last email - although you have basically
the right idea - the devil is in the details - but I do know for sure
that Mesa *has* had problems with some combinations of glPush/PopAttrib.

Try the extra getState()->apply() - and if *that* doesn't fix it then
you are probably looking at a Mesa error.

-- 
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