Re: Problem deriving GLArea widget

[Bill McGrory <wdmcgrory gmail com>]

Following up:
I got the included test program to work by making the following change 
in glarea.cc
At this point, I'm not sure if this is a complete and total fix, as I 
need to see if my full featured class can be used correctly.

588,592c588,590
<   if(base && base->create_context) {
<       Glib::RefPtr<Gdk::GLContext> 
retval(Glib::wrap((*base->create_context)(gobj()),true));
<       return retval;
<   }
<
---
>   if(base && base->create_context)
>     return Glib::wrap((*base->create_context)(gobj()));
>

I'm assuming it's the take_copy argument passed to wrap?


On 04/22/2016 12:23 PM, Bill McGrory wrote:
> I am trying to derive a widget off of Gtk::GLArea,
> when I do, I get GLib-GObject-CRITICAL **: g_value_take_object: 
> assertion 'G_IS_OBJECT (v_object)' failed
> and "OpenGL context creation failed.
>
> I have tracked this to
> GdkGLContext* GLArea_Class::create_context_callback(GtkGLArea* self)
>
> where a different path is taken whether or not the GtkGLArea self is 
> derived or not.
> However, I don't know if I am not doing something correctly, or if 
> this is a bug.
>
> Any help would be apprectiate.
>
> the following example demonstrates the problem under a ubuntu 16.04.
>
> TIA
> Bill