Re: [Mesa3d-users] Need help regarding OpenGL 2.0 Calls

[Karl S. <kar...@gm...>]

That is a feature of WinXP.  It will repair system DLL's that it thinks are
damaged or changed.

You should put the Mesa-compiled OpenGL32.dll in the same directory as your
application executable.  It will find it there first, before the one in
System32.

On Thu, May 14, 2009 at 1:45 AM, vinit bansal <ban...@gm...>wrote:

> Hi Brian,
> Thanks for your reply.
> I have one very basic question.
> As OpenGL 2.0 needs h/w support, Mesa provides s/w sln for it, right ?
>
> One funny things is happening with me.
> Mesa is giving me OpenGL32.lib/OpenGL32.dll, which contains all def
> for 2.0 calls.
> When i m making any 2.0 calls, it is refering to
> C:/Windows/System32/OpenGL32.dll.
> which is for GL 1.1 and does not contain any 2.0 call. So its getting
> unresolved symbol.
> When i m trying to replace it with my Mesa genreted OpenGL32.dll, its
> not able to replace.
> I mean, again it is reverting back to the old one.
> I dont know why this surprising behaviour is happening.
>
> Thanks in advance
> Regards
>
> On Wed, May 13, 2009 at 7:08 PM, Brian Paul <br...@vm...> wrote:
> > vinit bansal wrote:
> >>
> >> Hi,
> >>
> >> I have downloaded MESA v7.4.
> >> I need to run a sample program which uses openGL 2.0 calls on Windows.
> >> I have noticed that 2.0 calls are under a flag GL_GLEXT_PROTOTYPES in
> >> glext.h
> >> I have defined this flag and I have tried to use a 2.0 call (in this
> >> case glCreateShader(GLenum)). But it gives linker errors:
> >> 1>gears.obj : error LNK2019: unresolved external symbol
> >> _glCreateShader@0 referenced in function _init
> >> 1>.\Debug/gears.exe : fatal error LNK1120: 1 unresolved externals.
> >>
> >> I am a beginner to openGL.
> >> I don't think the gears sample program uses any 2.0 calls.
> >>
> >> I need help urgently.
> >
> > On Windows you need to use function pointers obtained with
> > wglGetProcAddress() to call the OpenGL 2.0 functions (actually, OpenGL
> 1.3
> > and later, I believe).
> >
> > Probably the best thing to do is use GLEW:  http://glew.sourceforge.net/
> >
> > -Brian
> >
>
>
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