Re: GtkGLArea with GtkOffscreenWindow

[Rob Conde <rob conde ai-solutions com>]

Replying to myself:

Talked to Emmanuele on IRC...the gist is:

• no, this won't work
  
• GtkOffscreenWindow shouldn't be used in general
• The desired effect can be achieved by using a GtkWindow, not showing it, and explicitly mapping the widget

Rob

---

From: gtk-list <gtk-list-bounces gnome org> on behalf of Rob Conde <rob conde ai-solutions com>
Sent: Thursday, October 4, 2018 8:17:59 AM
To: gtk-list gnome org
Subject: GtkGLArea with GtkOffscreenWindow

 

Hello,

   Consider the following program:

int main()

{

gtk_init(nullptr,nullptr);

auto window = gtk_offscreen_window_new();

auto gl_area = gtk_gl_area_new();

gtk_container_add(GTK_CONTAINER(window),gl_area);

gtk_widget_realize(gl_area);

gtk_widget_show_all(window);

auto glContext = gtk_gl_area_get_context(GTK_GL_AREA(gl_area));

std::cout << "Context is " << glContext << std::endl;

gtk_main();

}

  

The glContext is null. Can GtkGLArea work with GtkOffscreenWindow?

Thanks,

Rob Conde