Using GTK w/ Unity

Unity Engine
1

Anyone had any success on using GTK# with Unity?

I am on OSX and trying to create a simple window from my game, but, when I do, I get a “DLLNotFoundException: glibsharpglue-2” error. Right now I’ve just got the GTK DLLs copied over to my project (atk-sharp, gdk-sharp, glade-sharp, glib-sharp, gtk-sharp, and pango-sharp) that I copied from the MonoDevelop install that came with Unity.

Any advice or suggestions?

2

Gtk# is just a set of bindings for Gtk+ from what I can tell. You still need to have Gtk+ libraries, and possibly some Gnome bits too.

3

Yeah, I have the libraries, it just looks like it can’t find them.

Right now I’ve copied the glue SO files from /Library/Frameworks/Mono.framework/Versions/2.10.9/lib to /Applications/Unity/Unity.app/Contents/Frameworks/Mono/lib and this seems to resolve the namespace/location issue. (I tried editing Unity’s mono config file (mono/etc/config) to include DLL maps to the SOs but this didn’t seem to do anything)

Of course, Unity crashes when I invoke Gtk, so, I seem to still be missing something. Perhaps I am using the wrong version of the libraries.

4

It should support the same version or higher of Gtk+ if the Mono libraries track Gtk+ versions. So Gtk# and glue libs 2.10.0 should work with Gtk+ 2.10.0 or higher (as long as they’re within the 2.x line).

5

Well, I figured out the first issue with the Not Found errors. Solution:

  1. Copy the GTK wrapper DLLs from /Library/Frameworks/Mono.framework/Versions/2.10/lib/mono/gtk-sharp-2.0 to your project (Plugins, presumably).
  2. Then edit /Applications/Unity/Unity.app/Contents/Frameworks/Mono/etc/mono/config and add the references to the actual GTK SO files from the 2.10 install. In particular, I added
	<dllmap os="osx" dll="libgtk-win32-2.0-0.dll" target="/Library/Frameworks/Mono.framework/Versions/2.10/lib/libgtk-quartz-2.0.0.dylib" />
	<dllmap os="osx" dll="glibsharpglue-2" target="/Library/Frameworks/Mono.framework/Versions/2.10/lib/libglibsharpglue-2.so" />
	<dllmap os="osx" dll="libgthread-2.0-0" target="/Library/Frameworks/Mono.framework/Versions/2.10/lib/libgthread-2.0.0.dylib" />
	<dllmap os="osx" dll="libgthread-2.0-0.dll" target="/Library/Frameworks/Mono.framework/Versions/2.10/lib/libgthread-2.0.0.dylib" />
	<dllmap os="osx" dll="libglib-2.0-0.dll" target="/Library/Frameworks/Mono.framework/Versions/2.10/lib/libglib-2.0.0.dylib" />
	<dllmap os="osx" dll="libgobject-2.0-0.dll" target="/Library/Frameworks/Mono.framework/Versions/2.10/lib/libgobject-2.0.0.dylib" />
	<dllmap os="osx" dll="gtksharpglue-2" target="/Library/Frameworks/Mono.framework/Versions/2.10/lib/libgtksharpglue-2.so" />
  1. Then restart Unity so that it picks up on the references.

I even got a Gtk window to appear! :slight_smile:

Unfortunately the Gtk loop seems to be interfering with Unity in some way, so, once I do Gtk.Application.Run() Unity appears to lock up but it looks like it’s just waiting on the Gtk main loop to finish or something like that.

1 Like
6

Having trouble integrating the GTK event loop with Unity. Anyone have any suggestions?

7

Well, what have you tried? I assume you’re running the GTK stuff in its own thread so that they can both be doing their thing at once?

8

One attempt has been to Init GTK and instead of calling Run, pump the event loop in a co-routine. For example:

class InterpreterTest1 (MonoBehaviour):

	def _create_window():
		w = Window("test window")
		b = Button("click me")
		b.Clicked += EventHandler(_click_event)
		w.Add(b)
		w.ShowAll()

	static def _click_event(obj as object, args as EventArgs):
		Debug.Log("You clicked on the button.")

	def _pump_gtk():
		while true:
			if Gtk.Application.EventsPending():
				Gtk.Application.RunIteration()
			yield

	def Start():
		Gtk.Application.Init()
		StartCoroutine("_pump_gtk")

	def OnApplicationQuit():
		Gtk.Application.Quit()

This, however, has some issues with Gtk that I haven’t figured out, namely, that Gtk thinks there is no main loop and trips a bunch of asserts. (Gtk-CRITICAL **: gtk_main_quit: assertion `main_loops != NULL’ failed) This isn’t really related to Unity at all.

So, then I figured, well, I’ll just put it in a Thread. Except that this has similar problems but also trips up Unity. When Gtk.Widget:gtk_widget_show_all(IntPtr) is called, it kicks off an “ArgumentException: CompareBaseObjectsInternal can only be called from the main thread.” error that is related to the Editor losing focus after the native call, along with a bunch of Gtk context errors.

class InterpreterTest2 (MonoBehaviour):

	def _create_window():
		def _helper():
			Gtk.Application.Init()
			w = Window("hi")
			b = Button("print")
			b.Clicked += EventHandler(_click_event)
			w.Add(b)
			w.ShowAll()
			Gtk.Application.Run()
		t = Thread(ThreadStart(_helper))
		t.Start()

	static def _click_event(obj as object, args as EventArgs):
		Debug.Log("You clicked on the button.")

	def OnApplicationQuit():
		def _helper():
			Gtk.Application.Quit()	
		Gtk.Application.Invoke(_helper)
9

Anyone have any suggestions? :slight_smile: