From 14a12afb6ceb6344712dea3cb028bac23f2f29d1 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Mon, 13 Dec 2010 10:46:18 +0000
Subject: [PATCH] From Eduardo Poyart, "The attached patch fixes a race
 condition that caused OSG to try to render the scene before the window is
 realized. It works ok in my osgviewerWX-derived application under Linux."

---
 examples/osgviewerWX/osgviewerWX.cpp | 3 +++
 examples/osgviewerWX/osgviewerWX.h   | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/examples/osgviewerWX/osgviewerWX.cpp b/examples/osgviewerWX/osgviewerWX.cpp
index 0a7ac616f..b9d34f4e3 100644
--- a/examples/osgviewerWX/osgviewerWX.cpp
+++ b/examples/osgviewerWX/osgviewerWX.cpp
@@ -106,6 +106,9 @@ void MainFrame::SetViewer(osgViewer::Viewer *viewer)
 
 void MainFrame::OnIdle(wxIdleEvent &event)
 {
+    if (!_viewer->isRealized())
+        return;
+
     _viewer->frame();
 
     event.RequestMore();
diff --git a/examples/osgviewerWX/osgviewerWX.h b/examples/osgviewerWX/osgviewerWX.h
index a79368c9e..db41d24a2 100644
--- a/examples/osgviewerWX/osgviewerWX.h
+++ b/examples/osgviewerWX/osgviewerWX.h
@@ -67,7 +67,7 @@ public:
     // not implemented yet...just use dummy implementation to get working.
     virtual bool valid() const { return true; }
     virtual bool realizeImplementation() { return true; }
-    virtual bool isRealizedImplementation() const  { return true; }
+    virtual bool isRealizedImplementation() const  { return _canvas->IsShownOnScreen(); }
     virtual void closeImplementation() {}
     virtual bool releaseContextImplementation() { return true; }