From 26526038cac9b7cb6ccc83a18559f3f5ed305750 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Mon, 24 Mar 2008 18:03:19 +0000
Subject: [PATCH] Added mutex to prevent multiple cull threads changing the
 MultiTextureControl at one time.

---
 examples/osgmultitexturecontrol/osgmultitexturecontrol.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/examples/osgmultitexturecontrol/osgmultitexturecontrol.cpp b/examples/osgmultitexturecontrol/osgmultitexturecontrol.cpp
index e9135ff4a..05ade529d 100644
--- a/examples/osgmultitexturecontrol/osgmultitexturecontrol.cpp
+++ b/examples/osgmultitexturecontrol/osgmultitexturecontrol.cpp
@@ -104,6 +104,8 @@ class ElevationLayerBlendingCallback : public osg::NodeCallback
                 return;
             }
             
+            OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_mutex);
+            
             float deltaTime = 0.01f;
             if (_previousFrame!=-1)
             {
@@ -172,6 +174,8 @@ class ElevationLayerBlendingCallback : public osg::NodeCallback
         float                                           _animationTime;
         osg::observer_ptr<osgFX::MultiTextureControl>   _mtc;
         Elevations                                      _elevations;
+        
+        OpenThreads::Mutex                              _mutex;
 };