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

[Brian P. <br...@vm...>]

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