OgreLodStrategy.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

Permission is hereby granted, free of charge, to any person obtaining a copy
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*/
#ifndef __Lod_Strategy_H__
#define __Lod_Strategy_H__

#include "OgrePrerequisites.h"

#include "OgreMesh.h"

#include "OgreMovableObject.h"
#include "OgreCamera.h"
#include "OgreHeaderPrefix.h"

namespace Ogre {

    class _OgreExport LodStrategy : public LodAlloc
    {
    protected:
        String mName;

        virtual Real getValueImpl(const MovableObject *movableObject, const Camera *camera) const = 0;

    public:
        LodStrategy(const String& name);

        virtual ~LodStrategy();

        virtual Real getBaseValue() const = 0;

        virtual Real transformBias(Real factor) const = 0;

        virtual Real transformUserValue(Real userValue) const;

        Real getValue(const MovableObject *movableObject, const Camera *camera) const;

        virtual ushort getIndex(Real value, const Mesh::MeshLodUsageList& meshLodUsageList) const = 0;

        virtual ushort getIndex(Real value, const Material::LodValueList& materialLodValueList) const = 0;

        virtual void sort(Mesh::MeshLodUsageList& meshLodUsageList) const = 0;

        virtual bool isSorted(const Mesh::LodValueList& values) const = 0;

        void assertSorted(const Mesh::LodValueList& values) const;

        const String& getName() const { return mName; }

    protected:
        static bool isSortedAscending(const Mesh::LodValueList& values);
        static bool isSortedDescending(const Mesh::LodValueList& values);

        static void sortAscending(Mesh::MeshLodUsageList& meshLodUsageList);
        static void sortDescending(Mesh::MeshLodUsageList& meshLodUsageList);

        static ushort getIndexAscending(Real value, const Mesh::MeshLodUsageList& meshLodUsageList);
        static ushort getIndexDescending(Real value, const Mesh::MeshLodUsageList& meshLodUsageList);

        static ushort getIndexAscending(Real value, const Material::LodValueList& materialLodValueList);
        static ushort getIndexDescending(Real value, const Material::LodValueList& materialLodValueList);

    };
} // namespace

#include "OgreHeaderSuffix.h"

#endif