Changed the osg::LightSource so its Light attribute is now generalised to

be a StateAttribute.  This allows alternative implementations of Lights
other than the standard osg::Light.

src/osg/LightSource.cpp

@@ -18,7 +18,7 @@ LightSource::~LightSource()
 }
 
 
-void LightSource::setLight(Light* light)
+void LightSource::setLight(StateAttribute* light)
 {
     _light = light;
     setLocalStateSetModes(_value);

src/osgPlugins/osg/LightSource.cpp

@@ -27,9 +27,7 @@ bool LightSource_readLocalData(Object& obj, Input& fr)
 
     LightSource& lightsource = static_cast<LightSource&>(obj);
 
-    static ref_ptr<Light> s_light =  osgNew osg::Light;
-
-    Light* light = static_cast<Light*>(fr.readObjectOfType(*s_light));
+    StateAttribute* light=fr.readStateAttribute();
     if (light)
     {
         lightsource.setLight(light);

src/osgUtil/CullVisitor.cpp

@@ -383,7 +383,7 @@ void CullVisitor::apply(LightSource& node)
     if (node_state) pushStateSet(node_state);
 
     Matrix& matrix = getModelViewMatrix();
-    Light* light = node.getLight();
+    StateAttribute* light = node.getLight();
     if (light)
     {
         addPositionedAttribute(&matrix,light);