Subject: glxext.h: missing typedef - msg#00000

1) Is glXGetProcAddress() (and glXGetProcAddressARB()) supposed to be
defined as specified

void (*glXGetProcAddressARB(const GLubyte *procName))(...)

or as listed in the current glxext.h file (dated 2002/03/22)

typedef void (*__GLXextFuncPtr)(void);
extern __GLXextFuncPtr glXGetProcAddressARB (const GLubyte *);

I ask because...


2) The __GLXextFuncPtr typedef is unavailable if glxext.h is
used in conjunction with GL/gl.h.

The current glxext.h defines the __GLXextFuncPtr typedef and the
glXGetProcAddress() prototype:


#ifndef GLX_ARB_get_proc_address
typedef void (*__GLXextFuncPtr)(void);
#endif

#ifndef GLX_VERSION_1_4
#define GLX_VERSION_1_4 1
#ifdef GLX_GLXEXT_PROTOTYPES
extern __GLXextFuncPtr glXGetProcAddress (const GLubyte *);
#endif /* GLX_GLXEXT_PROTOTYPES */
typedef __GLXextFuncPtr ( * PFNGLXGETPROCADDRESSPROC) (const GLubyte
*procName);
#endif


Unfortunately, an implementation (such as XFree86-devel-4.2.0-8) which
defines the glXGetProcAddress() prototype will also define the
GLX_ARB_get_proc_address macro in GL/gl.h, and the GLXextFuncPtr
typedef won't get defined, causing a compile error.

With the latest glxext.h, the following simple source file
(foo.c) generates an error:

/*
cc -I. -c foo.c

In file included from foo.c:13:
glxext.h:362: parse error before `*'
glxext.h:362: `__GLXextFuncPtr' declared as function returning a function
*/

#include <GL/glx.h>
#include <glxext.h>
void foo(void)
{
glXGetProcAddress("func");
}

Joe


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Joseph Michaud SGI Applications Eng jmichaud@xxxxxxx
vmail: 650-933-9455 office: 781-839-2100