Dispersion.h

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/*
 * Dispersion.h
 *
 * Copyright (c) 2023 Lost Robot <r94231/at/gmail/dot/com>
 *
 * This file is part of LMMS - https://lmms.io
 *
 * 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 (see COPYING); if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA.
 *
 */
 
 
#ifndef LMMS_DISPERSION_H
#define LMMS_DISPERSION_H
 
#include "DispersionControls.h"
#include "Effect.h"
 
 
namespace lmms
{
 
constexpr inline int MAX_DISPERSION_FILTERS = 999;
 
class DispersionEffect : public Effect
{
public:
        DispersionEffect(Model* parent, const Descriptor::SubPluginFeatures::Key* key);
        ~DispersionEffect() override = default;
 
        ProcessStatus processImpl(SampleFrame* buf, const f_cnt_t frames) override;
 
        EffectControls* controls() override
        {
                return &m_dispersionControls;
        }
        
        void runDispersionAP(const int filtNum, const float apCoeff1, const float apCoeff2, std::array<sample_t, 2> &put);
 
private:
        DispersionControls m_dispersionControls;
        
        float m_sampleRate;
        
        int m_amountVal;
        
        using Filter = std::array<sample_t, MAX_DISPERSION_FILTERS * 2>;
        struct FilterState {
                Filter x0{};
                Filter x1{};
                Filter y0{};
                Filter y1{};
        };
        FilterState m_state = {};
        
        std::array<float, 2> m_feedbackVal{};
        std::array<float, 2> m_integrator{};
 
        friend class DispersionControls;
};
 
 
} // namespace lmms
 
#endif // LMMS_DISPERSION_H