GTKCGLcodingHelpDemo-1

Open 'side4linux' and click on 'Project>New Project' in the Main Menue.
Select 'GTKBUILDER 'C' GUI Program with OpenGL' as in figure-1 below and click on 'NEXT' in the Dialog Box.
Select the 'PRODUCTS' Product Area in the Product Selection Dialog and click on 'OK' as in figure-2,
Select 'MC-1' from the Product Area selection Combo Box ( figure-3 ) and click on the 'Next' button,
In the New Project dialog enter the name of 'Sample' as in figure-4 and click on 'Build'.
Once the Project is Built, close the project.
'Project>Close Project'
Note that it will be stored in the 'GTKCGL' section of the 'MC-1' Product.
Change directory to your new program ( that is '~/SIDE/PRODUCTS/MC1/GTKCGL3/Sample/src' ).
and run the program in a terminal, ( in my case that is 'db@wks1:~/Data/Projects/SIDE/PRODUCTS/MC1/GTKCGL3/Sample1/src$ ./sample1' ).
Note: Do not forget the 'dot forward slash' which says look in the 'current' directory for the program.
This brings up the program 'sample' as in figure-5 ( not much to see here as we have not yet created the OpenGL widget ).
Look at the text behind the program ( a good place to start when something does not work as expected ) and see the startup output generated.

Draw3D_CheckForOpenGL, OpenGL is supported
Trying local 'glade' file
Local 'glade' file found!

(sample:13212): Gtk-WARNING **: Could not find signal handler 'on_programQuitToolbutton_clicked'
(sample:13212): Gtk-WARNING **: Could not find signal handler 'on_fileSaveAsToolbutton_clicked'
(sample:13212): Gtk-WARNING **: Could not find signal handler 'on_fileSaveToolbutton_clicked'
(sample:13212): Gtk-WARNING **: Could not find signal handler 'on_fileOpenToolbutton_clicked'
(sample:13212): Gtk-WARNING **: Could not find signal handler 'on_fileOpenToolbutton_clicked'
(sample:13212): Gtk-WARNING **: Could not find signal handler 'on_aboutMenuitem_activate'
(sample:13212): Gtk-WARNING **: Could not find signal handler 'on_programQuitMenuitem_activate'
(sample:13212): Gtk-WARNING **: Could not find signal handler 'on_saveFileAsMenuitem_activate'
(sample:13212): Gtk-WARNING **: Could not find signal handler 'on_openFileMenuitem_activate'
(sample:13212): Gtk-WARNING **: Could not find signal handler 'on_newFileMenuitem_activate'

So as you can see the only 3D command is output from the function Draw3D_CheckForOpenGL
This function is in the libdraw3dS4L library added when the project was built by the IDE.
The function outputs that in this case that we have a working 3d environment!

Also note,

We have found the Glade GUI build file ( 'sample.glade' ) needed for GTK+ Builder to build our Widgets.
and a host of unsatisfied 'callback' signals that will need 'handlers' written for them. ( check GTKC projects in the Help for callback handlers ).
We have not yet generated a 3D widget ( we do this in Demo-2 next ) so there is nothing else to see in figure-5!

Now go down to Exercise-2.

ReOpen the newly created 'Sample' project 'Project>Open Project' in the IDE.
Note that it will be stored in the 'GTKCGL3' section of the 'MC-1' Product.
Open 'main.c' in the Code Notebook of the IDE ( click on 'TXT' button in the Toolbar ).

Notice ( in main.c ) that all of the widgets are instantiated in the call to mainWindow = buildWidgets(cmdString);
Notice ( in main.c ) that all of the callback signals are created in the call to gtk_builder_connect_signals(builder,NULL);
Notice ( in main.c ) 'mainWindow = GTK_WIDGET(gtk_builder_get_object(builder,"mainWindow"));' <-- to set the pointer to mainWindow.
Notice ( in main.c) 'g_signal_connect(GTK_OBJECT(mainWindow),"destroy",G_CALLBACK(gtkQuit),NULL);
Notice that gtkQuit() is in callbacks.c
Close the 'sample' program window by clicking on the top right 'X'.
Close the newly created project 'Project>Close Project'.

Fig-1	Fig-2
Fig-3	Fig-4
Fig-5

OpenGL(R) Programming Guide: The Official Guide to Learning OpenGL(R), Version 2.1 (6th Edition) (Paperback)