extended display mode handling to accept WXMODE env. variable

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@13230 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/mgl/window.cpp

@@ -469,12 +469,14 @@ END_EVENT_TABLE()
 // constructors and such
 // ----------------------------------------------------------------------------
 
+extern wxDisplayModeInfo wxGetDefaultDisplayMode();
+
 void wxWindowMGL::Init()
 {
     // First of all, make sure window manager is up and running. If it is
     // not the case, initialize it in default display mode
     if ( !g_winMng )
-        wxTheApp->SetDisplayMode(wxDisplayModeInfo(640, 480, 16));
+        wxTheApp->SetDisplayMode(wxGetDefaultDisplayMode());
 
     // generic:
     InitBase();