Re: [Mesa3d-users] link error with USE_MGL_NAMESPACE

[tom f. <tf...@al...>]

Sam Eml <em...@ya...> writes:
[snip]
> so perhaps I just needed to include glprocs.h somewhere rather than change
> wmesa.c. Anyway, I managed to build opengl32.dll and osmesa32.dll with
> USE_MGL_NAMESPACE defined, but am still not sure how to use both this Mesa
> opengl32.dll and the default opengl32.dll at the same time at runtime (eg.
> call mgl*() functions in one context and gl*() functions in another).

I am currently working on getting exactly this [1] to work in GLEW, so
I would recommend going down that route.

First, though, I recommend you build MesaOpenGL32.dll when
USE_MGL_NAMESPACE is defined.  This will allow you to link both OpenGL
and mangled Mesa in the same program.

I only care about this on Linux, but it would be a neat feature-bullet
if it worked on Windows (and Mac, for that matter).  If you would be
interested in collaborating, please contact me off-list.

Best,

-tom

[1] Sort of.  I only care about one context per process, but I don't
    know which until I've gone through some runtime initialization.

> Karl Schultz wrote:
> > 
> > You probably have to change _glapi_get_context to _mglapi_get_context
> > in mesa.def.  I guess the leading '_' was to blame.
> > 
> > Here's how to solve the problem on your own:
> > 
> > You're in VS8, right?
> > 
> > Use "Find in Files" to find all occurrences of "glapi_get_context".
> > 
> > It shows up in mesa.def.  good
> > 
> > In glapi.h, we see:
> > 
> > #if defined(USE_MGL_NAMESPACE)
> > #define _glapi_set_dispatch _mglapi_set_dispatch
> > #define _glapi_get_dispatch _mglapi_get_dispatch
> > #define _glapi_set_context _mglapi_set_context
> > #define _glapi_get_context _mglapi_get_context
> > #define _glapi_Context _mglapi_Context
> > #define _glapi_Dispatch _mglapi_Dispatch
> > #endif
> > 
> > Ah, it does get mangled, so the def file needs to export the mangled
> > symbol.
> > 
> > Karl
> > 
> > 
> > On Thu, Feb 19, 2009 at 2:17 PM, Sam Eml <em...@ya...> wrote:
> >>
> >> Hi,
> >>
> >> I'm trying to build Mesa with mangled namespace in VC8 as described in
> >> the
> >> README.WIN32: I've specified the preprocessor flag USE_MGL_NAMESPACE in
> >> the
> >> project settings, and changed the gl* symbols to mgl* in mesa.def
> >> (drivers/windows/gdi/mesa.def).
> >>
> >> The mesa project of the solution builds ok, but the gdi project gives:
> >>
> >> error LNK2001: unresolved external symbol _glapi_get_context    mesa.def
> >> fatal error LNK1120: 1 unresolved externals
> >> ...\Mesa-7.3\windows\VC8\mesa\Debug\OPENGL32.lib
> >>
> >> Would anyone have any ideas?
> >>
> >> --
> >> View this message in context:
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> 2.html
> >> Sent from the mesa3d-users mailing list archive at Nabble.com.
> >>
> >>
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> -- 
> View this message in context: http://www.nabble.com/link-error-with-USE_MGL_N
> AMESPACE-tp22109892p22166971.html
> Sent from the mesa3d-users mailing list archive at Nabble.com.
> 
> 
> -----------------------------------------------------------------------------
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> -Strategies to boost innovation and cut costs with open source participation
> -Receive a $600 discount off the registration fee with the source code: SFAD
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