prediction.h

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#ifndef __PREDICTION_H
#define __PREDICTION_H

#include "clientptr.h"
#include "gfx/quaternion.h"
#include "cubicsplines.h"

enum    interpolationMethod {Linear, Spline};

class Prediction
{
protected:
//A2 is the predicted position after InitInterpolation()
    QVector    A0, B, A1, A2, A3;
    Vector     VA, VB, AA, AB;
    Quaternion OA, OB;

    double     deltatime;

public: Prediction();
    virtual ~Prediction();
    virtual void InitInterpolation( Unit *un,
                                    const ClientState &last_packet_state,
                                    double elapsed_since_last_packet,
                                    double deltatime );

//Interpolate between current received position and predicted position at time 0+deltatime
//On the first call, deltatime is the lag value between client and server
//for the following calls deltatime = lag+elapsed time since we received last packet
    virtual QVector InterpolatePosition( Unit *un, double deltatime ) const = 0;
    virtual Quaternion InterpolateOrientation( Unit *un, double deltatime ) const = 0;
    virtual Transformation Interpolate( Unit *un, double deltatime ) const;
};

class NullPrediction : public Prediction
{
public:
    virtual void InitInterpolation( Unit *un,
                                    const ClientState &last_packet_state,
                                    double elapsed_since_last_packet,
                                    double deltatime );
    virtual QVector InterpolatePosition( Unit *un, double deltatime ) const;
    virtual Quaternion InterpolateOrientation( Unit *un, double deltatime ) const;
};

class LinearPrediction : virtual public Prediction
{
public:
    virtual QVector InterpolatePosition( Unit *un, double deltatime ) const;
    virtual Quaternion InterpolateOrientation( Unit *un, double deltatime ) const;
    virtual Transformation Interpolate( Unit *un, double deltatime ) const;
};

class CubicSplinePrediction : virtual public Prediction
{
private:
    CubicSpline interpolation_spline;
public:
    virtual void InitInterpolation( Unit *un,
                                    const ClientState &last_packet_state,
                                    double elapsed_since_last_packet,
                                    double deltatime );
    virtual QVector InterpolatePosition( Unit *un, double deltatime ) const;
    virtual Quaternion InterpolateOrientation( Unit *un, double deltatime ) const;
};

class MixedPrediction : public CubicSplinePrediction
    , public LinearPrediction
{
public:
    virtual QVector InterpolatePosition( Unit *un, double deltatime ) const;
    virtual Quaternion InterpolateOrientation( Unit *un, double deltatime ) const;
    virtual Transformation Interpolate( Unit *un, double deltatime ) const;
};

#endif