#ifndef OSG_TRANSPARENCY
#define OSG_TRANSPARENCY 1

#include <osg/Export>
#include <osg/Object>
#include <osg/GL>

namespace osg {


class SG_EXPORT Transparency : public Object
{
    public :

        enum TransparencyMode {
            DST_ALPHA            = GL_DST_ALPHA,
            DST_COLOR            = GL_DST_COLOR,
            ONE                  = GL_ONE,
            ONE_MINUS_DST_ALPHA  = GL_ONE_MINUS_DST_ALPHA,
            ONE_MINUS_DST_COLOR  = GL_ONE_MINUS_DST_COLOR,
            ONE_MINUS_SRC_ALPHA  = GL_ONE_MINUS_SRC_ALPHA,
            ONE_MINUS_SRC_COLOR  = GL_ONE_MINUS_SRC_COLOR,
            SRC_ALPHA            = GL_SRC_ALPHA,
            SRC_ALPHA_SATURATE   = GL_SRC_ALPHA_SATURATE,
            SRC_COLOR            = GL_SRC_COLOR,
            ZERO                 = GL_ZERO
        };

        Transparency();
        static Transparency * instance();
        virtual Object* clone() const { return new Transparency(); }
        virtual bool isSameKindAs(Object* obj) { return dynamic_cast<Transparency*>(obj)!=NULL; }
        virtual const char* className() const { return "Transparency"; }

        void setFunction( int source, int destination );
        static void enable( void );
        static void disable( void );
        void apply( void );

    protected :

        virtual ~Transparency();

        int _source_factor;
        int _destination_factor;
};

};

#endif