bxc#10522: GLSLShader: DrawView on main thread

GLSLShader/MyOpenGLView.cs

@@ -179,7 +179,7 @@ namespace GLSLShader
 			using (NSAutoreleasePool pool = new NSAutoreleasePool ()) {
 
 				// Update the animation
-				DrawView ();
+				BeginInvokeOnMainThread (DrawView);
 			}
 
 			return CVReturn.Success;