Re: PBuffers

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Mario Veraart (rioj7++at++fel.tno.nl)
Wed, 5 Nov 1997 11:32:40 +0100 (MET)

>
> I saw from the info-performer alias that some have been attempting to
> render into a Pbuffer with performer. Have you gotten it to work?
>
> I've been having a little difficulty getting this to work myself. I've
> been able to get performer to render into a motif window. But if I
> switch that to a pbuffer, it dies in a call to XGetWindowAttributes
> which is called from pfWindow::open.
>
> In your implementation, did you just do this:
>
> pipeWindow->setWSDrawable(0, p_buffer_drawable);
>
> This is all I did for the motif case but have the above problem when
> trying to do this with a pbuffer.
>
> Are there other things you can suggest I check into?
>
> Thanks for any help,
>
> Wade
>

I have found a mail concerning pbuffers that contains a few URLs

Mario
-----------------------------
Subject: Re: PixelBuffer on RE2 With irix6.4
From: brianp++at++ra.avid.com
Date: Fri, 16 May 1997 08:44:45 -0500
To: Yann Argotti <Yann.Argotti++at++imag.fr>
Reply-To: brianp++at++ra.avid.com
Sender: brianp++at++ra.avid.com
Cc: info-performer++at++sgi.com

On May 15, 2:35pm, Yann Argotti wrote:

> I want to make offcreen Rendering with an Onyx Re2 (2xR10000, 1 Gbytes
for RAM
> and irix 6.4). PixelBuffer solution appears the good way for that.
>
> My problem is that, when I create PBuffer with glXCreateGLXPbufferSGIX
> (an OpenGL instruction), a "BadAlloc" error (ie: insufficient resources
> for operation) stops the programme.
>
> I just try to create a PBuffer of 2x3 pixels, with a red, green, blue
size
> of 4, depth size of 23, in a single buffer mode and aPBuffer drawable
type.
> glXChooseFBConfigSGIX function gives me 3 suitable FBconfigs (I decide
to use
> the first one (the best) where GLX_MAX_PBUFFER_WIDTH_SGIX is 2048 and
> GLX_MAX_PBUFFER_HEIGHT_SGIX is 1120).
>
> Also, I suppose having enought ressources to allocate this little
PBuffer
> and the solution, to solve current problem, is not very clear.
> Is it a bug from me, from OpenGL or from Hardware ??

As part of the SIGGRAPH '97 course on OpenGL and Window System Integration
which I'm doing with Mark Kilgard one of the subjects I investigated was
off-screen rendering methods, including pbuffers.

Pbuffers are a pain to use. I think I finally figured them out though.
Check out my notes on the subject at
http://www.ssec.wisc.edu/~brianp/sig97/offscrn.htm
See the "SGI Pbuffers" section.

It explains the "BadAlloc" problem.

Then, grab http://www.ssec.wisc.edu/~brianp/sig97/pbuffer.trz which contains
pbuffer utility code and a demo program.

Hope this helps.

-Brian

-- 
--------------------------------------------------------------------
Brian Paul   Avid Technology   Madison, WI   brianp++at++elastic.avid.com


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