OgreDistanceLodStrategy.h

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/*
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This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2013 Torus Knot Software Ltd

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*/
#ifndef __Distance_Lod_Strategy_H__
#define __Distance_Lod_Strategy_H__

#include "OgrePrerequisites.h"

#include "OgreLodStrategy.h"
#include "OgreSingleton.h"
#include "OgreNode.h"

namespace Ogre {
    class _OgreExport DistanceLodStrategy : public LodStrategy
    {
    protected:
        virtual Real getValueImpl(const MovableObject *movableObject, const Camera *camera) const;

    public:
        DistanceLodStrategy(const String& name);

        virtual Real getBaseValue() const;

        virtual Real transformBias(Real factor) const;

        virtual Real transformUserValue(Real userValue) const;

        virtual ushort getIndex(Real value, const Mesh::MeshLodUsageList& meshLodUsageList) const;

        virtual ushort getIndex(Real value, const Material::LodValueList& materialLodValueList) const;

        virtual void sort(Mesh::MeshLodUsageList& meshLodUsageList) const;

        virtual bool isSorted(const Mesh::LodValueList& values) const;

        virtual Real getSquaredDepth(const MovableObject *movableObject, const Ogre::Camera *camera) const = 0;

        void setReferenceView(Real viewportWidth, Real viewportHeight, Radian fovY);

        void setReferenceViewEnabled(bool value);

        bool isReferenceViewEnabled() const;

    private:
        bool mReferenceViewEnabled;
        Real mReferenceViewValue;

    };
    class _OgreExport DistanceLodSphereStrategy : public DistanceLodStrategy, public Singleton<DistanceLodSphereStrategy>
    {
    public:
        DistanceLodSphereStrategy();

        Real getSquaredDepth(const MovableObject *movableObject, const Ogre::Camera *camera) const;

        static DistanceLodSphereStrategy& getSingleton(void);
        static DistanceLodSphereStrategy* getSingletonPtr(void);
    };
    class _OgreExport DistanceLodBoxStrategy : public DistanceLodStrategy, public Singleton<DistanceLodBoxStrategy>
    {
    public:
        DistanceLodBoxStrategy();

        Real getSquaredDepth(const MovableObject *movableObject, const Ogre::Camera *camera) const;

        static DistanceLodBoxStrategy& getSingleton(void);
        static DistanceLodBoxStrategy* getSingletonPtr(void);
    };
} // namespace

#endif