Re: [Mesa3d-users] link error with USE_MGL_NAMESPACE

[Sam E. <em...@ya...>]

Thanks for your help Karl. Besides adding _mglapi_get_context to mesa.def, I
found that I also had to rename gl_dispatch_stub_*() to
mgl_dispatch_stub_*() in wmesa.c and rename glu* to mglu* in glu.def ...

I later noticed that glprocs.h has:

#ifdef USE_MGL_NAMESPACE
#define gl_dispatch_stub_343 mgl_dispatch_stub_343
#define gl_dispatch_stub_344 mgl_dispatch_stub_344
...

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).



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?
>>
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> Enterprise
> -Strategies to boost innovation and cut costs with open source
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