/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 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_CLUSTERCULLINGCALLBACK
#define OSG_CLUSTERCULLINGCALLBACK 1

#include <osg/Drawable>

namespace osg {

/** Drawable CullCallback for adding cluster culling to cull back facing
  * drawables.*/
class SG_EXPORT ClusterCullingCallback : public Drawable::CullCallback
{
    public:

        ClusterCullingCallback();
        ClusterCullingCallback(const ClusterCullingCallback& ccc,const CopyOp& copyop);
        ClusterCullingCallback(const osg::Vec3& controlPoint, const osg::Vec3& normal, float deviation);
        ClusterCullingCallback(const osg::Drawable* drawable);

        META_Object(osg,ClusterCullingCallback)

        /** compute the control point, normal and deviation from the contents of the drawable.*/
        void computeFrom(const osg::Drawable* drawable);

        void set(const osg::Vec3& controlPoint, const osg::Vec3& normal, float deviation, float radius);

        void setControlPoint(const osg::Vec3& controlPoint) { _controlPoint = controlPoint; }
        const osg::Vec3& getControlPoint() const { return _controlPoint; }

        void setNormal(const osg::Vec3& normal) { _normal = normal; }
        const osg::Vec3& getNormal() const { return _normal; }

        void setRadius(float radius) { _radius = radius; }
        float getRadius() const { return _radius; }

        void setDeviation(float deviation) { _deviation = deviation; }
        float getDeviation() const { return _deviation; }

        virtual bool cull(osg::NodeVisitor*, osg::Drawable*, osg::State*) const;

    protected:

        virtual ~ClusterCullingCallback() {}

        osg::Vec3    _controlPoint;
        osg::Vec3    _normal;
        float        _radius;
        float        _deviation;
};


}

#endif