CullFace

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/* -*-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_CULLFACE
#define OSG_CULLFACE 1
 
#include <osg/GL>
#include <osg/StateAttribute>
 
namespace osg {

class OSG_EXPORT CullFace : public StateAttribute
{
    public :
 
        enum Mode {
            FRONT = GL_FRONT,
            BACK = GL_BACK,
            FRONT_AND_BACK = GL_FRONT_AND_BACK
        };
 
        CullFace(Mode mode=BACK):
            _mode(mode) {}

        CullFace(const CullFace& cf,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
            StateAttribute(cf,copyop),
            _mode(cf._mode) {}
 
        META_StateAttribute(osg, CullFace, CULLFACE);

        virtual int compare(const StateAttribute& sa) const
        {
            // check the types are equal and then create the rhs variable
            // used by the COMPARE_StateAttribute_Parameter macros below.
            COMPARE_StateAttribute_Types(CullFace,sa)
 
            // compare each parameter in turn against the rhs.
            COMPARE_StateAttribute_Parameter(_mode)
 
            return 0; // passed all the above comparison macros, must be equal.
        }
 
        virtual bool getModeUsage(StateAttribute::ModeUsage& usage) const
        {
            usage.usesMode(GL_CULL_FACE);
            return true;
        }
 
        inline void setMode(Mode mode) { _mode = mode; }
 
        inline Mode getMode() const { return _mode; }
 
        virtual void apply(State& state) const;
 
    protected:
 
        virtual ~CullFace();
 
        Mode _mode;
 
};
 
}
 
#endif