TransformationHistory.h

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#ifndef __TRANFORMATION_HISTORY_H
#define __TRANFORMATION_HISTORY_H

#include "RakNetTypes.h"
#include "OgreVector3.h"
#include "OgreQuaternion.h"
#include "DS_Queue.h"
#include "RakMemoryOverride.h"

struct TransformationHistoryCell
{
        TransformationHistoryCell();
        TransformationHistoryCell(RakNetTime t, const Ogre::Vector3& pos, const Ogre::Vector3& vel, const Ogre::Quaternion& quat  );

        RakNetTime time;
        Ogre::Vector3 position;
        Ogre::Quaternion orientation;
        Ogre::Vector3 velocity;
};

class TransformationHistory
{
public:
        void Init(RakNetTime maxWriteInterval, RakNetTime maxHistoryTime);
        void Write(const Ogre::Vector3 &position, const Ogre::Vector3 &velocity, const Ogre::Quaternion &orientation, RakNetTime curTimeMS);
        void Overwrite(const Ogre::Vector3 &position, const Ogre::Vector3 &velocity, const Ogre::Quaternion &orientation, RakNetTime when);
        enum ReadResult
        {
                // We are reading so far in the past there is no data yet
                READ_OLDEST,
                // We are not reading in the past, so the input parameters stay the same
                VALUES_UNCHANGED,
                // We are reading in the past
                INTERPOLATED
        };
        // Parameters are in/out, modified to reflect the history
        ReadResult Read(Ogre::Vector3 *position, Ogre::Vector3 *velocity, Ogre::Quaternion *orientation,
                RakNetTime when, RakNetTime curTime);
        void Clear(void);
protected:
        DataStructures::Queue<TransformationHistoryCell> history;
        unsigned maxHistoryLength;
        RakNetTime writeInterval;
};

#endif