[GtkGLExt] flipping Pixbuf images

["Phillip Neiswanger" <sigsegv prodigy net>]

Hello,

I am slowly learning gtkglextmm and opengl.  I wrote a small program that  
does texturing, and I've run into a small problem I was wondering if you  
could help me with.  I used Gdk::Pixbuf::create_from_file() to load the  
image and later a call to glTexImage2D() setup the texture.  However, the  
image is displayed backwards on its quad.  The image has text in it, so I  
couldn't leave it that way.  I ended up flipping the image with a paint  
program.

I am wondering if Gdk or GL provides a ready made function that could have  
done the flipping for me at run time.
--
phil