Win32 gtkglarea...

[Suboner aol com]

I noticed gtkglarea was not available for the work in progress win32 version 
of the gtk+, so I took the *liberty* and hacked one together. You can see (a 
pic) and play (exes and sources) with the results here...

http://members.aol.com/suboner/opengl/gtkgl/

So far the modified version of gtkglarea and the example hello world program 
works with OpenGL with my hardware, but goes blank with software opengl. In 
another example program I was working on, both software and hardware OpenGL 
worked, but a weird problem occured where the window would have to be resized 
before it was viewable, and when it was resized it appears as though an 
alternate screen redrawn was occuring (same thing happens in MFC if you do 
not handle background redraw messages).

As far as the gtkglarea is concerned, the archecture for opengl on win32 and 
xwindows/glx was totally diffrent, I had to add a realize function into the 
deal, and skip the gdk for making glcontexts, and this brings about an 
non-crucial error message as it seems that reshaping occurs before 
realization of a widget.

To use it in a win32 gtk program, you have to link with the gdkgl.obj and 
gtkglarea.obj, look at the example make file in HWorld to get a better 
understanding.