Re: GtkGLArea with GtkOffscreenWindow

Rob Conde <rob.conde@xxxxxxxxxxxxxxxx> · Thu, 4 Oct 2018 18:36:30 +0000

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@xxxxxxxxx> on behalf of Rob Conde <rob.conde@xxxxxxxxxxxxxxxx>

Sent: Thursday, October 4, 2018 8:17:59 AM

To: gtk-list@xxxxxxxxx

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

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