//C++ header - Open Scene Graph - Copyright (C) 1998-2002 Robert Osfield
//Distributed under the terms of the GNU Library General Public License (LGPL)
//as published by the Free Software Foundation.

#ifndef OSG_LIGHTSOURCE
#define OSG_LIGHTSOURCE 1

#include <osg/NodeVisitor>
#include <osg/Light>
#include <osg/Group>

namespace osg {

/** Leaf Node for defining a light in the scene.*/
class SG_EXPORT LightSource : public Group
{
    public:
    
        LightSource();

        LightSource(const LightSource& ls, const CopyOp& copyop=CopyOp::SHALLOW_COPY):
            Group(ls,copyop),
            _value(ls._value),
            _light(dynamic_cast<osg::StateAttribute*>(copyop(ls._light.get()))) {}

        META_Node(osg, LightSource);

        /** Set the attached light.*/
        void setLight(StateAttribute* light);

        /** Get the attached light.*/
        inline StateAttribute* getLight() { return _light.get(); }

        /** Get the const attached light.*/
        inline const StateAttribute* getLight() const { return _light.get(); }

        /** Set the GLModes on StateSet associated with the LightSource.*/
        void setStateSetModes(StateSet&,const StateAttribute::GLModeValue) const;

        /** Set up the local StateSet */
        void setLocalStateSetModes(const StateAttribute::GLModeValue=StateAttribute::ON);

    protected:

        virtual ~LightSource();

        virtual const bool computeBound() const;

        StateAttribute::GLModeValue     _value;
        ref_ptr<StateAttribute>         _light;
};

}

#endif