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copied!<p>The way I do it (gtkmm / C++ code) is like this:</p> <pre><code>#include <gtkmm.h> #include <gtkglmm.h> class GLWidget : public Gtk::GL::DrawingArea { public: GLWidget(Glib::RefPtr<Gdk::GL::Config> glconfig) : Gtk::GL::DrawingArea(glconfig) {} ~GLWidget() {} virtual bool on_expose_event(GdkEventExpose* event); }; bool GLWidget::on_expose_event(GdkEventExpose* event) { Glib::RefPtr<Gdk::GL::Drawable> d = get_gl_drawable(); d->gl_begin(get_gl_context()); // make this as complex as you need glClear(GL_COLOR_BUFFER_BIT); d->swap_buffers(); d->gl_end(); return true; } int main(int argc, char **argv) { Gtk::Main kit(argc, argv); Gtk::GL::init(argc, argv); Glib::RefPtr<Gtk::Builder> builder = Gtk::Builder::create_from_file("ui.glade"); Gtk::Window* mainWindow; Gtk::Alignment* container; builder->get_widget("mainWindow", mainWindow); builder->get_widget("Box", container); if (mainWindow == NULL || container == NULL) { g_critical("Gtk Builder failed to load mainWindow and/or container !\n"); return -1; } Glib::RefPtr<Gdk::GL::Config> glconfig; glconfig = Gdk::GL::Config::create(Gdk::GL::MODE_RGBA | Gdk::GL::MODE_DOUBLE); if (!glconfig) glconfig = Gdk::GL::Config::create(Gdk::GL::MODE_RGB); if (!glconfig) { g_critical("Cannot create OpenGL-capable config\n"); return -1; } GLWidget drawingArea(glconfig); drawingArea.set_size_request(640, 480); drawingArea.show(); container->add(drawingArea); kit.run(*mainWindow); return 0; </code></pre> <p>I.e. I'm simply loading a UI that contains an <em>empty</em> container widget, get the handle to that by name, then create the GL-enabled drawing area in code and add it to the empty container. Supposedly, it's possible to "load-time" substitute an ordinary Gtk DrawingArea for a GtkGL one (see <a href="https://stackoverflow.com/questions/1904481/opengl-gtkglextmm-glade">this posting</a>) but that method didn't work for me; the above, programmatically creating it, always did.</p> <p>You need gtkglext / gtkglextmm for the GL Drawingarea widget.</p>

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