Filter6581.h

/*
 * This file is part of libsidplayfp, a SID player engine.
 *
 * Copyright 2011-2026 Leandro Nini <drfiemost@users.sourceforge.net>
 * Copyright 2007-2010 Antti Lankila
 * Copyright 2004,2010 Dag Lem <resid@nimrod.no>
 *
 * 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 FILTER6581_H
#define FILTER6581_H

#include "Filter.h"
#include "FilterModelConfig6581.h"
#include "Integrator6581.h"

#include "siddefs-fp.h"

namespace reSIDfp
{

class Integrator6581;

class Filter6581 final : public Filter
{
    friend class State;

private:
    Integrator6581 hpIntegrator;

    Integrator6581 bpIntegrator;

    const uint16_t* f0_dac;

protected:
    void updateCenterFrequency() override;

    void restartIntegrators() override { hpIntegrator.restart(); bpIntegrator.restart(); }

    /*
     * The filter input resistors on the 6581 are slightly bigger than the voice ones,
     * scale the values accordingly.
     */
    int32_t getNormalizedMixerVoice(float v, uint8_t env) const override
    {
        return getNormalizedVoice(v * static_cast<float>(FilterModelConfig6581::VF_TR_RATIO), env);
    }

public:
    Filter6581() :
        Filter(*FilterModelConfig6581::getInstance(), hpIntegrator, bpIntegrator),
        hpIntegrator(*FilterModelConfig6581::getInstance()),
        bpIntegrator(*FilterModelConfig6581::getInstance()),
        f0_dac(FilterModelConfig6581::getInstance()->getDAC(0.5))
    {}

    ~Filter6581() override;

    void setFilterCurve(double curvePosition);

    static void setFilterRange(double adjustment)
    {
        FilterModelConfig6581::getInstance()->setFilterRange(adjustment);
    }

    static void enableOldCaps(bool enable)
    {
        FilterModelConfig6581::getInstance()->enableOldCaps(enable);
    }
};

} // namespace reSIDfp

#endif