Re: [Mesa3d-users] using osmesa together with nvidia GL implementation

[Viral P. <Vir...@an...>]

Hi Alex,

You can link in both Mesa and Non-Mesa gl implementations, the key is to
use 
mesa in mangled mode, such that, when calling into mesa all gl calls
are:

mgl*

but calling into non-mesa the calls are,

gl*

This either means you need to write all your code twice or preferably
use function 
pointers/virtual interfaces to reference each implementation.

You will also need to be careful to use mgl calls only when using with
an OSMesa gl 
context.

What you are currently doing is linking in 2 different libraries with
the conflicting
symbols, simplistically the linker is using some functions from mesa and
some from 
nvogl.

I would look at the mangled_* headers in mesa, and the mesa doc has a
section on 
mangling the api entry points. 

Hope this helps.

Viral Patel 

Ansys Inc,


-----Original Message-----
From: Alex Flint [mailto:ale...@gm...] 
Sent: 17 February 2010 12:27
To: mes...@li...
Subject: [Mesa3d-users] using osmesa together with nvidia GL
implementation

Hi there,

My program is happily linking to the nvidia OpenGL implementation for
its normal onscreen rendering. I would like within a small part of
this program to use the offscreen rendering capabilities of OSMesa. If
I link to both /usr/lib/libGL.so and /usr/lib/libOSMesa.so then I get
strange results: either my offscreen-rendered images are blank or GL
crashes, depending on which order I do the linking.

My first question is: is this even supposed to work? If so I will
investigate further and post much more detailed info about what's
going wrong.

If not, is there any other way that I can get both 3D acceleration for
onscreen rendering and (un-accelerated) offscreen rendering working in
the same binary?

Thanks in advance,
Alex

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