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fastneuron.h

/***************************************************************************
                          fastneuron.h  -  description
                             -------------------
    begin                : Tue Jan 22 2002
    copyright            : (C) 2002 by Matt Grover
    email                : mgrover@amygdala.org
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef FASTNEURON_H
#define FASTNEURON_H

#include <amygdala/neuron.h>

class FastNeuron : public Neuron  {
public: 
    FastNeuron(AmIdInt neuronId);
    virtual ~FastNeuron();

    virtual float* InitializeLookupTable(int index);

    virtual float* GetTableParams(int index, int& numParams);

    virtual const char* ClassId() { return "FastNeuron"; }

protected:
    // Functions:

    virtual void InputSpike(SynapseItr& inSynapse,
                            AmTimeInt inTime,
                            unsigned int numSyn = 0);

    virtual int SetLookupTables(FunctionLookup* funcRef);

    virtual int FillLookupTables(int index);

    virtual void SetMaxScaledWeight();

private:
    inline void PspKernel(float calcTime, float* pspElement);

    /*
     * Tables used to cache value of PSP function
     * for each time step (number of steps cached is specified by
     * pspLSize)
     */
    float* pspLookup;

    /*
     * Index into the begining point of inputHist.  This is used
     * to avoid parsing over old and non-contributing input.
     */
    unsigned int histBgnIdx;

    /*
     * The inverse of the step size.  Used in input spike
     * rather than dividing by stepSize as an optimization.
     */
    float stepSizeInv;
};

#endif

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