From Cedric Pinson, "Here a patch to be able to clone stateattribute, in order to do that i

moved the StateAttribute::Callback structure to a file
StateAttributeCallback with the same behavior as NodeCallback.
"

src/osg/CMakeLists.txt

@@ -140,6 +140,7 @@ SET(LIB_PUBLIC_HEADERS
     ${HEADER_PATH}/ShapeDrawable
     ${HEADER_PATH}/State
     ${HEADER_PATH}/StateAttribute
+    ${HEADER_PATH}/StateAttributeCallback
     ${HEADER_PATH}/StateSet
     ${HEADER_PATH}/Stats
     ${HEADER_PATH}/Stencil

src/osg/CopyOp.cpp

@@ -18,6 +18,7 @@
 #include <osg/Array>
 #include <osg/PrimitiveSet>
 #include <osg/Shape>
+#include <osg/StateAttribute>
 
 using namespace osg;
 
@@ -67,7 +68,7 @@ StateAttribute* CopyOp::operator() (const StateAttribute* attr) const
 
 NodeCallback* CopyOp::operator() (const NodeCallback* nc) const
 {
-    if (nc && _flags&DEEP_COPY_NODECALLBACKS)
+    if (nc && _flags&DEEP_COPY_CALLBACKS)
     {
         // deep copy the full chain of callback
         osg::NodeCallback* first = dynamic_cast<osg::NodeCallback*>(nc->clone(*this));
@@ -85,3 +86,17 @@ NodeCallback* CopyOp::operator() (const NodeCallback* nc) const
     else
         return const_cast<NodeCallback*>(nc);
 }
+
+
+StateAttributeCallback* CopyOp::operator() (const StateAttributeCallback* sc) const
+{
+    if (sc && _flags&DEEP_COPY_CALLBACKS)
+    {
+        // deep copy the full chain of callback
+        StateAttributeCallback* cb = dynamic_cast<StateAttributeCallback*>(sc->clone(*this));
+        return cb;
+    }
+    else
+        return const_cast<StateAttributeCallback*>(sc);
+}
+

src/osg/StateAttribute.cpp

@@ -42,7 +42,7 @@ void StateAttribute::removeParent(osg::StateSet* object)
 }
 
 
-void StateAttribute::setUpdateCallback(Callback* uc)
+void StateAttribute::setUpdateCallback(StateAttributeCallback* uc)
 {
     osg::notify(osg::INFO)<<"StateAttribute::Setting Update callbacks"<<std::endl;
 
@@ -69,7 +69,7 @@ void StateAttribute::setUpdateCallback(Callback* uc)
     }
 }
 
-void StateAttribute::setEventCallback(Callback* ec)
+void StateAttribute::setEventCallback(StateAttributeCallback* ec)
 {
     osg::notify(osg::INFO)<<"StateAttribute::Setting Event callbacks"<<std::endl;
 

src/osg/StateSet.cpp

@@ -1673,7 +1673,7 @@ void StateSet::runUpdateCallbacks(osg::NodeVisitor* nv)
             itr!=_attributeList.end();
             ++itr)
         {
-            StateAttribute::Callback* callback = itr->second.first->getUpdateCallback();
+            StateAttributeCallback* callback = itr->second.first->getUpdateCallback();
             if (callback) (*callback)(itr->second.first.get(),nv);
         }
 
@@ -1686,7 +1686,7 @@ void StateSet::runUpdateCallbacks(osg::NodeVisitor* nv)
                 itr!=attributeList.end();
                 ++itr)
             {
-                StateAttribute::Callback* callback = itr->second.first->getUpdateCallback();
+                StateAttributeCallback* callback = itr->second.first->getUpdateCallback();
                 if (callback) (*callback)(itr->second.first.get(),nv);
             }
         }
@@ -1747,7 +1747,7 @@ void StateSet::runEventCallbacks(osg::NodeVisitor* nv)
             itr!=_attributeList.end();
             ++itr)
         {
-            StateAttribute::Callback* callback = itr->second.first->getEventCallback();
+            StateAttributeCallback* callback = itr->second.first->getEventCallback();
             if (callback) (*callback)(itr->second.first.get(),nv);
         }
 
@@ -1760,7 +1760,7 @@ void StateSet::runEventCallbacks(osg::NodeVisitor* nv)
                 itr!=attributeList.end();
                 ++itr)
             {
-                StateAttribute::Callback* callback = itr->second.first->getEventCallback();
+                StateAttributeCallback* callback = itr->second.first->getEventCallback();
                 if (callback) (*callback)(itr->second.first.get(),nv);
             }
         }