//C++ header - Open Scene Graph - Copyright (C) 1998-2001 Robert Osfield
//Distributed under the terms of the GNU Library General Public License (LGPL)
//as published by the Free Software Foundation.

#ifndef OSG_SHADEMODEL
#define OSG_SHADEMODEL 1

#include <osg/GL>
#include <osg/StateAttribute>
#include <osg/StateSet>

namespace osg {

/** Class which encapsulates glShadeModel(..).
*/     
class SG_EXPORT ShadeModel : public StateAttribute
{
    public :
    
        ShadeModel();

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

        META_StateAttribute(ShadeModel, SHADEMODEL);
        
        /** return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.*/
        virtual int compare(const StateAttribute& sa) const
        {
            // check the types are equal and then create the rhs variable
            // used by the COMPARE_StateAttribute_Paramter macro's below.
            COMPARE_StateAttribute_Types(ShadeModel,sa)

            // compare each paramter in turn against the rhs.
            COMPARE_StateAttribute_Parameter(_mode)

            return 0; // passed all the above comparison macro's, must be equal.
        }

        enum Mode {
            FLAT = GL_FLAT,
            SMOOTH = GL_SMOOTH
        };
    
        inline void setMode(const Mode mode) { _mode = mode; }

        inline const Mode getMode() const { return _mode; }
    
        virtual void apply(State& state) const;
        
    protected:
    
        virtual ~ShadeModel();
        
        Mode _mode;

};

}

#endif