#ifndef OSG_VIEWPORT
#define OSG_VIEWPORT 1

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

namespace osg {

/** Encapsulte OpenGL glViewport.
*/     
class SG_EXPORT Viewport : public StateAttribute
{
    public :
    
    
        Viewport();
        virtual bool isSameKindAs(const Object* obj) const { return dynamic_cast<const Viewport*>(obj)!=0L; }
        virtual Object* clone() const { return new Viewport(); }
        virtual const char* className() const { return "Viewport"; }
    
        virtual const Type getType() const { return VIEWPORT; }
        
        inline void setViewport(const int x,const int y,const int width,const int height)
        {
            _x = x;
            _y = y;
            _width = width;
            _height = height;
        }
        
        void getViewport(int& x,int& y,int& width,int& height)
        {
            x = _x;
            y = _y;
            width = _width;
            height = _height;
        }

        inline const int x() const { return _x; }
        inline const int y() const { return _y; }
        inline const int width() const { return _width; }
        inline const int height() const { return _height; }

        /** return the aspcetRatio of the viewport, which is equal to width/height.*/
        inline const float aspectRatio() const { return (float)_width/(float)_height; }

        virtual void apply(State& state) const;

    protected:
    
        virtual ~Viewport();

        int _x;
        int _y;
        int _width;
        int _height;

};

};

#endif