Add support for glutGetProcAddress() on Mac OS X and other platforms

via dlsym() (STR #1582)


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@5673 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

configh.in

@@ -287,6 +287,12 @@
 #  define strtoll(nptr,endptr,base) strtol((nptr), (endptr), (base))
 #endif /* !HAVE_STRTOLL */
 
+/*
+ * Do we have the dlsym() function?
+ */
+
+#undef HAVE_DLSYM
+
 /*
  * End of "$Id$".
  */

configure.in

@@ -433,6 +433,9 @@ fi
 
 AC_CHECK_FUNC(strtoll, AC_DEFINE(HAVE_STRTOLL))
 
+dnl Check for dlopen/dlsym...
+AC_SEARCH_LIBS(dlsym, dl, AC_DEFINE(HAVE_DLSYM))
+
 dnl Check for audio libraries...
 AUDIOLIBS=""
 

src/glut_compatability.cxx

@@ -43,6 +43,9 @@
 #    define GLX_GLXEXT_LEGACY
 #    include <GL/glx.h>
 #  endif // HAVE_GLXGETPROCADDRESSARB
+#  ifdef HAVE_DLSYM
+#    include <dlfcn.h>
+#  endif // HAVE_DLSYM
 #  define MAXWINDOWS 32
 static Fl_Glut_Window *windows[MAXWINDOWS+1];
 
@@ -439,8 +442,17 @@ int glutDeviceGet(GLenum type) {
 GLUTproc glutGetProcAddress(const char *procName) {
 #  ifdef WIN32
   return (GLUTproc)wglGetProcAddress((LPCSTR)procName);
+
+#  elif defined(HAVE_DLSYM)
+  char symbol[1024];
+
+  snprintf(symbol, sizeof(symbol), "_%s", procName);
+
+  return (GLUTproc)dlsym(RTLD_DEFAULT, symbol);
+
 #  elif defined(HAVE_GLXGETPROCADDRESSARB)
   return (GLUTproc)glXGetProcAddressARB((const GLubyte *)procName);
+
 #  else
   return (GLUTproc)0;
 #  endif // WIN32