OK, I eventually got my Ogre + Gtk app to work. For those interested,
have a look at the GtkOgre app on the Ogre wiki, and replace
gtk_ogre_realize() with this version (which creates a GdkWindow first,
then passes it as external window handle to Ogre when creating the
RenderWindow) :
static void gtk_ogre_realize(GtkWidget *widget)
{
GtkOgre* ogre;
g_return_if_fail(widget != NULL);
g_return_if_fail(GTK_IS_OGRE(widget));
ogre = GTK_OGRE(widget);
g_return_if_fail(ogre->mRenderWindowName != NULL);
g_return_if_fail(ogre->mRenderWindow == NULL);
GdkWindow* parent = gtk_widget_get_parent_window(widget);
//Create the GdkWindow:
GdkWindowAttr attributes;
memset(&attributes, 0, sizeof(attributes));
//Set initial position and size of the Gdk::Window:
attributes.x = widget->allocation.x;
attributes.y = widget->allocation.y;
attributes.width = widget->allocation.width;
attributes.height = widget->allocation.height;
//Set event mask as needed here
attributes.event_mask = GDK_ALL_EVENTS_MASK;
attributes.window_type = GDK_WINDOW_CHILD;
attributes.wclass = GDK_INPUT_OUTPUT;
GTK_WIDGET_UNSET_FLAGS(widget, GTK_NO_WINDOW);
widget->window = GDK_DRAWABLE(gdk_window_new(parent, &attributes,
GDK_WA_X | GDK_WA_Y));
Ogre::NameValuePairList params;
params["externalWindowHandle"] =
Ogre::StringConverter::toString((unsigned
long)GDK_WINDOW_HWND(widget->window));
ogre->mRenderWindow =
Ogre::Root::getSingleton().createRenderWindow("GtkOgreWidget" +
Ogre::StringConverter::toString(++s_wid),
widget->allocation.width, widget->allocation.height, false,
¶ms);
gtk_widget_set_double_buffered(widget, FALSE);
gdk_window_set_user_data(widget->window, G_OBJECT(widget));
gdk_window_set_back_pixmap(widget->window, NULL, FALSE);
/* Set realized flag */
GTK_WIDGET_SET_FLAGS(widget, GTK_REALIZED);
}
Also, see this thread for details :
http://www.ogre3d.org/phpBB2/viewtopic.php?t=21731&postdays=0&postorder=asc&start=0
Vincent Delannoy a écrit :
> Hi,
>
> I'm looking for a way to embed an Ogre3D visualisation in a GTK child
> widget while still being able to receive keyboard/mouse events in such
> a widget.
>
> The ogre-gtk example app from the Ogre wiki successfully displays Ogre
> in child widgets, but for some reason, events can't be received
> anymore, despite gtk-signal-connect'ing them, as well as setting
> GDK_ALL_EVENTS_MASK on these widgets
>
> There must be a way around this problem since I know it to be working
> with GTKmm.
>
> Does anyone have suggestions/sample code regarding this issue?
>
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