From 4ca3a4fd45f0bce7eaaf2ef489279e9e5b5286ae Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Wed, 23 Nov 2005 15:25:56 +0000
Subject: [PATCH] Changed the linux implement of getGLExtensionFuncPtr to
 querry for glXGetProcAddressARB and then use this if its available, otherwise
 fallback to the original dlsym usage.

---
 src/osg/GLExtensions.cpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/osg/GLExtensions.cpp b/src/osg/GLExtensions.cpp
index d445b6787..26d72defb 100644
--- a/src/osg/GLExtensions.cpp
+++ b/src/osg/GLExtensions.cpp
@@ -245,6 +245,20 @@ void* osg::getGLExtensionFuncPtr(const char *funcName)
 
     return dlsym( RTLD_DEFAULT, funcName );
 
+#elif defined (__linux__)
+
+    typedef void (*__GLXextFuncPtr)(void);
+    typedef __GLXextFuncPtr (*GetProcAddressARBProc)(const char*);
+    static GetProcAddressARBProc s_glXGetProcAddressARB = (GetProcAddressARBProc)dlsym(0, "glXGetProcAddressARB");
+    if (s_glXGetProcAddressARB)
+    {
+        return (void*) (s_glXGetProcAddressARB)(funcName);
+    }
+    else
+    {
+        return dlsym(0, funcName);
+    }
+
 #else // all other unixes
 
     return dlsym(0, funcName);