Added call to State::initializeExtensionsProcs() to prevent crashes before

these variables are initialized.

src/osg/GraphicsContext.cpp

@@ -431,6 +431,10 @@ bool GraphicsContext::makeCurrent()
     if (result)
     {
         _threadOfLastMakeCurrent = OpenThreads::Thread::CurrentThread();
+
+        // initialize extension proces, not only initializes on first
+        // call, will be a non-op on subsequent calls.        
+        getState()->initializeExtensionProcs();
     }
     
     return result;
@@ -443,6 +447,10 @@ bool GraphicsContext::makeContextCurrent(GraphicsContext* readContext)
     if (result)
     {
         _threadOfLastMakeCurrent = OpenThreads::Thread::CurrentThread();
+
+        // initialize extension proces, not only initializes on first
+        // call, will be a non-op on subsequent calls.        
+        getState()->initializeExtensionProcs();
     }
     
     return result;

src/osg/GraphicsThread.cpp

@@ -30,6 +30,8 @@ void GraphicsThread::run()
     if (graphicsContext)
     {        
         graphicsContext->makeCurrent();
+        
+        graphicsContext->getState()->initializeExtensionProcs();
     }
 
     OperationThread::run();