OpAmp.h

/*
 * This file is part of libsidplayfp, a SID player engine.
 *
 * Copyright 2011-2015 Leandro Nini <drfiemost@users.sourceforge.net>
 * Copyright 2007-2010 Antti Lankila
 * Copyright 2004,2010 Dag Lem
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
 
#ifndef OPAMP_H
#define OPAMP_H
 
#include <memory>
 
#include "Spline.h"
 
#include "sidcxx11.h"
 
namespace reSIDfp
{
 
class OpAmp
{
private:
    mutable double x;
 
    const double kVddt;
    const double vmin;
    const double vmax;
 
    std::unique_ptr<Spline> const opamp;
 
public:
    OpAmp(const Spline::Point opamp[], int opamplength, double kVddt) :
        x(0.),
        kVddt(kVddt),
        vmin(opamp[0].x),
        vmax(opamp[opamplength - 1].x),
        opamp(new Spline(opamp, opamplength)) {}
 
    void reset() const
    {
        x = vmin;
    }
 
    double solve(double n, double vi) const;
};
 
} // namespace reSIDfp
 
#endif