OgreLodStrategy.h

Go to the documentation of this file.

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

Copyright (c) 2000-2012 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-----------------------------------------------------------------------------
*/
#ifndef __Lod_Strategy_H__
#define __Lod_Strategy_H__

#include "OgrePrerequisites.h"

#include "OgreMesh.h"

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

#endif