DSO Example

In the exampleDSO.tar.gz you'll get the files:
exampleDSO/
exampleDSO/GNUmakefile
exampleDSO/exampleDSO.cpp

untar it, cd to exampleDSO, type
make and run the DSO. (Don't forget to have dgl-config and dtk-config in
your $PATH.)

You can then run it using the command:
> export DGL_DSO_FILES=desktopGroup

:exampleDSO
> dosg-fly --examine cow.osg

The DSO doesn't do much except print out the size of the first graphics
window, but does show you how to get the the Producer::RenderSurface
corresponding to the window, which might be handy. Eventually you'll want
to get all render surfaces for all windows, but we can deal with that later.

Here's an example of using a different DSO to get different behavior, and
might be handy for testing with multiple windows:
> export DGL_DSO_FILES=desktopGroup:hyperDisplay:exampleDSO
> dosg-fly --examine cow.osg

This DSO doesn't have every single callback used- it's not clear what
callbacks you need, and what you want the DSO to do. Let's get this one
working first, then later when the DSO's functionality is defined, I can
help you add more callbacks if they're needed.

If you need to add a DSO to the DIVERSE package itself, send it to me and
I'll test it and install it in DIVERSE for you. I think this would be saner
than you trying to mess with the DIVERSE package itself.