OgreVolumeCacheSource.h

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/*
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This source file is part of OGRE
(Object-oriented Graphics Rendering Engine)
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Copyright (c) 2000-2013 Torus Knot Software Ltd

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*/
#ifndef __Ogre_Volume_CacheSource_H__
#define __Ogre_Volume_CacheSource_H__

#include "OgreVector3.h"
#include "OgreVector4.h"

#include "OgreVolumeSource.h"
#include "OgreVolumePrerequisites.h"

namespace Ogre {
namespace Volume {
    
    bool _OgreVolumeExport operator<(const Vector3& a, const Vector3& b);

    class _OgreVolumeExport CacheSource : public Source
    {
    protected:
        
        typedef map<Vector3, Vector4>::type UMapPositionValue;
        mutable UMapPositionValue mCache;

        const Source *mSrc;
        
        inline Vector4 getFromCache(const Vector3 &position) const
        {
            Vector4 result;
            map<Vector3, Vector4>::iterator it = mCache.find(position);
            if (it == mCache.end())
            {
                result = mSrc->getValueAndGradient(position);
                mCache[position] = result;
            }
            else
            {
                result = it->second;
            }
            return result;
        }

    public:
        
        CacheSource(const Source *src);
        
        virtual Vector4 getValueAndGradient(const Vector3 &position) const;
        
        virtual Real getValue(const Vector3 &position) const;

    };

}
}

#endif