Gl extensions

SDL Development
1

just a question, ive used glee and glux for loading OGL extensions,
is it just as easy to use
SDL_GL_GetProcAddress

to load the extensions i need so i can remove glee/glux from my project?
but then i also have to do some defines for the parameters, is there a
website you can goto that lists the function prototypes and defines you need
to load the appropriate extensions?-------------------------------
Fabian “SupaGu” Mathews

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2

Fabian Mathews wrote:

just a question, ive used glee and glux for loading OGL extensions,
is it just as easy to use SDL_GL_GetProcAddress

No, it’s not as easy.

is there a website you can goto that lists the function prototypes
and defines you need to load the appropriate extensions?

http://oss.sgi.com/projects/ogl-sample/registry/

  • get both the glext.h and glxext.h/wglext.h depending on which OS you use.

You can ease the work by using define-directives (I got this one from an
nvidia-paper somewhere)

#define INIT_ENTRY_POINT( funcname , type ) funcname = (type)
SDL_GL_GetProcAddress(#funcname);
if(!funcname) cerr << “#funcname() not initialized” << endl;

  • working like this
    INIT_ENTRY_POINT( glMultiTexCoord1dARB , PFNGLMULTITEXCOORD1DARBPROC );

Regards,
\Mikkel Gjoel

3

hi Fabian,

Before using any extension or to bind gl functions from extensions, try using
this in you C/C++ code, it worked for me. (still you have to insure you have
glext.h in your /usr/include/GL directory or elsewhere under windows). If you
don’t find glext.h, or your glext.h is too old, get it from www.opengl.org

#define GL_GLEXT_PROTOTYPES 1
#include <GL/glext.h>

this will declare typedefs for all gl extensions functions
for example :
PFNGLACTIVETEXTUREARBPROC is a typedef for glActiveTextureARB() function.
so you may use :
PFNGLACTIVETEXTUREARBPROC glActiveTextureARB;
(void*)&glActiveTextureARB = SDL_GL_GetProcAddress(“glActiveTextureARB”);
to bind your functions.

Regards,
William.On Thursday 08 April 2004 11:04, Fabian Mathews wrote:

just a question, ive used glee and glux for loading OGL extensions,
is it just as easy to use
SDL_GL_GetProcAddress

to load the extensions i need so i can remove glee/glux from my project?
but then i also have to do some defines for the parameters, is there a
website you can goto that lists the function prototypes and defines you
need to load the appropriate extensions?

Fabian “SupaGu” Mathews

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http://join.msn.com/?page=features/junkmail

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4

Hi Fabian

Perhaps you should have a look to http://www.levp.de/3d/ ; you can find
here a extension loading library, very useful.

Florent