So I found this example: https://github.com/GNOME/gtkmm/blob/master/demos/gtk-demo/example_glarea.cc
And it has #include <epoxy/gl.h> , and I thought, "what is that?" So I found this: https://github.com/anholt/libepoxy And, gee, it just works! I'm not sure if this is enough, becase epoxy_gl_version() returns 0, but the glArea->get_required_version() returns 4.5. I'll pretend it doesn't matter for now and bug someone (else?) later if I'm again at my wit's end. On Sun, 2021-04-11 at 01:52 +0000, JLM via gtkmm-list wrote: > I am trying to make use of OpenGL 4.5 in a gtkGlArea. The code below > works. However, I have the OpenGL Programming Guide Ninth Edition, and > it uses this instead of glClearColor: > > static const float black[] = { 0.0, 0.0, 0.0, 0.0 }; > glClearBufferfv(GL_COLOR, 0, black); > > When I try to use that, the compile doesn't find it: > > gtkgl.cpp:32:5: error: 'glClearBufferfv' was not declared in this > scope; did you mean 'glReadBuffer'? > 32 | glClearBufferfv(GL_COLOR, 0, black); > > I also tried #include <GL/glext.h> but that didn't help. > > So then I thought maybe I need to make use of GLEW. When I #include > <GL/glew.h>, that compiles at least. But, then I can't run GLEW's > setup: > > GLenum glewError = glewInit(); > if(glewError != GLEW_OK) > { > std::cerr << "Error: " << glewGetErrorString(glewError) << > std::endl; > } > > When I run, it always says: > > Error: Missing GL version > > So then I found the gtkGlArea method, set_required_version, and set it: > > gl > Area->set_required_version(4, 5); > > But that still didn't help. So then I thought maybe the GLEW init needs > to be in the on_realize() section, as I saw that this is where you put > OpenGL init stuff, but that still didn't work. > > So, what do I need to #include? Should I make use of GLEW, or does > GTK(MM) do everything necessary to get OpenGL already? Are there any > tutorials or examples? Most everything I find is for OpenGL 3.3, but I > don't know how to align that with the book I've got. > > Thanks for any help you can provide. > > > #include <gtkmm.h> > #include <iostream> > #include <GL/gl.h> > #include <GL/glu.h> > > Gtk::Window* pDialog = nullptr; > > static > void on_button_clicked() > { > if(pDialog) > pDialog->hide(); //hide() will cause main::run() to end. > } > > bool glRender(const Glib::RefPtr<Gdk::GLContext>&) > { > glClearColor(1.0f, 0.3f, 0.3f, 1.0f); > glClear(GL_COLOR_BUFFER_BIT); > return true; > } > > int main (int argc, char **argv) > { > auto app = Gtk::App > lication::create(argc, argv, "org.test"); > > //Load the GtkBuilder file and instantiate its widgets: > auto refBuilder = Gtk::Builder::create(); > try > { > refBuilder->add_from_file("glarea.glade"); > } > catch(const Glib::FileError& ex) > { > std::cerr << "FileError: " << ex.what() << std::endl; > return 1; > } > catch(const Glib::MarkupError& ex) > { > std::cerr << "MarkupError: " << ex.what() << std::endl; > return 1; > } > catch(const Gtk::BuilderError& ex) > { > std::cerr << "BuilderError: " << ex.what() << std::endl; > return 1; > } > > //Get the GtkBuilder-instantiated Dialog: > refBuilder->get_widget("Window", pDialog); > if(pDialog) > { > //Get the GtkBuilder-instantiated Button, and connect a signal > handler: > Gtk::MenuItem* pButton = nullptr; > refBuilder->get_widget("quitMenuItem", pButton); > if(pButton) > { > pButton->signa > l_activate().connect( sigc::ptr_fun(on_button_clicked) ); > } > > Gtk::GLArea* glArea = nullptr; > refBuilder->get_widget("glarea", glArea); > if(glArea) > { > glArea->signal_render().connect(sigc::ptr_fun(glRender) ); > } > app->run(*pDialog); > } > > delete pDialog; > > return 0; > } > > _______________________________________________ > gtkmm-list mailing list > gtkmm-list@gnome.org > https://mail.gnome.org/mailman/listinfo/gtkmm-list
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