Re: [Chromium-dev] glXGetProcAddressARB and IRIX

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

Sean Ahern wrote:
> 
> One thing that's been really annoying about Chromium and IRIX has been
> the use of glXGetProcAddressARB.  It doesn't exist on IRIX.
> 
> In hopes of learning more about this issue, I wandered google for a
> while.  I found the following article very intersting:
> http://lists.debian.org/debian-devel/2001/debian-
> devel-200107/msg00046.html
> 
> It suggests that if we don't have glXGetProcAddress, we should just
> dlopen(NULL, ...) and use the local gl library.  The snippet of code
> that might replace the call would be:
> 
>         #ifndef HAVE_GLXGETPROCADDRESS
>         #include <dlfcn.h>
>         void*
>         glXGetProcAddressARB(char *name)
>         {
>             void *dlhand;
> 
>             if ((dlhand = dlopen(NULL, RTLD_LAZY))) {
>                 void *handle;
> 
>                 handle = dlsym(dlhand, name);
>                 dlclose(dlhand);
>                 return handle;
>             }
>             return NULL;
>         }
>         #endif
> 
> This allows things like "tiletest" to at least link on IRIX.  However, I
> have almost *zero* knowledge about glXGetProcAddress, so I wanted to see
> if someone more knowledgeable than me on this list had any comments
> about this.

I think the simpler way would be to simply do this:

#ifndef HAVE_GLXGETPROCADDRESS   /* or may #ifdef IRIX */
void*
glXGetProcAddressARB(const char *name)
{
	return crGetProcAddress(name);
}
#endif

However, the crGetProcAddress() function doesn't have entries for all the GLX
functions.

glXGetProcAddress() is pretty simple, it just returns a pointer to the named
GL or GLX function.

-Brian