frustum.h

/* Copyright (c) 2009-2014, Stefan Eilemann <eile@equalizergraphics.com>
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License version 2.1 as published
 * by the Free Software Foundation.
 *
 * 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 GNU Lesser General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef EQFABRIC_FRUSTUM_H
#define EQFABRIC_FRUSTUM_H

#include <eq/fabric/projection.h> // member
#include <eq/fabric/wall.h>       // member
#include <eq/fabric/api.h>       // decl

namespace eq
{
namespace fabric
{
class Frustum
{
public:
    EQFABRIC_API Frustum();

    EQFABRIC_API virtual ~Frustum();

    enum Type
    {
        TYPE_NONE,        
        TYPE_WALL,        
        TYPE_PROJECTION   
    };

    EQFABRIC_API void setWall( const Wall& wall );

    EQFABRIC_API void setProjection( const Projection& projection );

    const Wall& getWall() const { return _data.wall; }

    const Projection& getProjection() const { return _data.projection; }

    Type getCurrentType() const { return _data.current; }

    EQFABRIC_API void unsetFrustum();

    EQFABRIC_API void serialize( co::DataOStream& os ); 
    EQFABRIC_API void deserialize( co::DataIStream& is ); 

    EQFABRIC_API virtual void backup(); 
    EQFABRIC_API virtual void restore(); 

protected:
    virtual void updateFrustum() {}
    virtual void notifyFrustumChanged() {}

private:
    struct BackupData
    {
        BackupData() : current( TYPE_NONE ) {}

        Wall wall;

        Projection projection;

        Type current;
    }
        _data, _backup;
};
EQFABRIC_API std::ostream& operator << ( std::ostream& os, const Frustum& );
}
}

namespace lunchbox
{
template<> inline void byteswap( eq::fabric::Frustum::Type& value )
    { byteswap( reinterpret_cast< uint32_t& >( value )); }
}

#endif // EQFABRIC_FRUSTUM_H