/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield 
 *
 * This library is open source and may be redistributed and/or modified under  
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
 * OpenSceneGraph Public License for more details.
*/

#ifndef OSG_HINT
#define OSG_HINT 1

#include <osg/StateAttribute>

namespace osg
{

class OSG_EXPORT Hint : public StateAttribute
{
public:

        Hint():
            _target(GL_NONE),
            _mode(GL_NONE) {}

        Hint(GLenum target, GLenum mode):
            _target(target),
            _mode(mode) {}

        /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
        Hint(const Hint& hint,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
            StateAttribute(hint,copyop),
            _target(hint._target),
            _mode(hint._mode) {}

        META_StateAttribute(osg, Hint, HINT);

        virtual int compare(const StateAttribute& sa) const
        {
	    // check the types are equal and then create the rhs variable
	    // used by the COMPARE_StateAttribute_Parameter macro's below.
	    COMPARE_StateAttribute_Types(Hint,sa)

            // compare each paramter in turn against the rhs.
            COMPARE_StateAttribute_Parameter(_target)
            COMPARE_StateAttribute_Parameter(_mode)
            
            return 0;
        }

        /** Return the member identifier within the attribute's class type. Used for light number/clip plane number etc.*/
        virtual unsigned int getMember() const { return static_cast<unsigned int>(_target); }
        
        inline void setTarget(GLenum target) { _target = target;  }
        inline GLenum getTarget() const { return _target;  }
        
        inline void setMode(GLenum mode) { _mode = mode; }
        inline GLenum getMode() const { return _mode; }

        virtual void apply(State& state) const;

protected:

        
        GLenum _target;
        GLenum _mode;
};


}

#endif
