Sample C code for GTK and OpenGL contexts, using GtkGLExt.

IIR · **Posted:** Tue Feb 10, 2009 1:44 pm

Hi folks, to help out anyone who is looking into using OpenGL within GTK windows (using GtkGLExt) I have released fully documented sample code in C to be used freely as you wish.

It provides safe render-process locking and smooth timer-based rendering while being simple, efficient and easy to understand what is going on.

Edit July 2009: The demo has been updated to use GtkBuilder and is now hosted on Sourceforge: http://gtkglapp.sourceforge.net/

Edit December 2010: Now with realtime GStreamer rendering (see below). Update at: http://sourceforge.net/projects/gtkglapp/files/Release/GtkGLAppGStreamer.tar.gz/download

To import the project into Eclipse IDE:
Open the menu 'File->Import...'.
From the 'General' options folder, select 'Existing Projects into Workspace' and click on the 'Next >' button.
Choose the 'Select archive file:' option and next to it click on the 'Browse...' button to navigate to the project archive (ending in '.tgz') you downloaded.
The project name will appear below - click on 'Finish'.
The project will be imported and opened in your Eclipse workspace.

For command-line users:
Please note that to run the application successfully outside of the Eclipse IDE environment (e.g. from a 'make' within the "../Debug/" directory) the GUI file "gtk_gl_tester.gtk" must reside in the same directory as the compiled binary for it to run.

caracal · **Posted:** Thu Feb 12, 2009 3:29 am

Nice and clean good job and thanks :)

IIR · **Posted:** Fri Jul 31, 2009 9:36 pm

Updated to use GtkBuilder and new host on Sourceforge.

IIR · **Posted:** Fri Dec 10, 2010 3:50 am

From demand to see a more advanced form of GStreamer video working within GTK+ the example now renders GStreamer realtime into multiple OpenGL drawables inside a GTK+ Builder window. It's also easy to read. :)

Update is at: http://sourceforge.net/projects/gtkglapp/files/Release/GtkGLAppGStreamer.tar.gz/download

jpka · **Joined:** Tue Jan 03, 2012 7:07 am **Posts:** 2

Hi IIR! Thank you for your work. But i currently can't run this code. I use Ubuntu and Eclipse, and i follow your step-by-step instructions. But i get linker error in Eclipse console:

Quote:

Building target: GtkGLAppGStreamer
Invoking: GCC C Linker
gcc -pthread -lgtk-x11-2.0 -lgdk-x11-2.0 -latk-1.0 -lgio-2.0 -lpangoft2-1.0 -lpangocairo-1.0 -lgdk_pixbuf-2.0 -lcairo -lpango-1.0 -lfreetype -lfontconfig -lgstreamer-0.10 -lgobject-2.0 -lgmodule-2.0 -lxml2 -lgthread-2.0 -lrt -lglib-2.0 -rdynamic -o"GtkGLAppGStreamer" ./src/main.o -lxml2 -lGLU -lgtkglext-x11-1.0 -lGL -lgstapp-0.10 -lglut
/usr/bin/ld: ./src/main.o: undefined reference to symbol 'gdk_gl_context_new'
/usr/bin/ld: note: 'gdk_gl_context_new' is defined in DSO /usr/lib/libgdkglext-x11-1.0.so.0 so try adding it to the linker command line
/usr/lib/libgdkglext-x11-1.0.so.0: could not read symbols: Invalid operation
collect2: ld returned 1 exit status
make: *** [GtkGLAppGStreamer] Error 1

...but it already added to linker command line, as i see.
The same error raises when i try to run this command from command line, outside the Eclipse.
I'm too novice in C, and can't find solutions for similar problems on the web. I also see this file is exist:

Quote:

$ sudo find / -name "*gtkglext-x11-1.0*"
/usr/lib/libgtkglext-x11-1.0.so.0.0.0
/usr/lib/pkgconfig/gtkglext-x11-1.0.pc
/usr/lib/libgtkglext-x11-1.0.a
/usr/lib/libgtkglext-x11-1.0.so.0
/usr/lib/libgtkglext-x11-1.0.la
/usr/lib/libgtkglext-x11-1.0.so

Can you help me please? Thank you very much!

IIR · **Posted:** Tue Feb 14, 2012 1:02 pm

Hi! Just spotted this! Due to some goalposts being moved in pkg-config, I have redone the project file to use the needed libraries directly; update is on SourceForge :)

jpka · **Joined:** Tue Jan 03, 2012 7:07 am **Posts:** 2

Hi IIR!
Thank you so much!
Now it works out-of-box!
It is really important for me.
Thank you for your work!
:-)

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Sample C code for GTK and OpenGL contexts, using GtkGLExt.

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