marvin_SVF.h

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// ========================================================================================================
//  _______ _______ ______ ___ ___ _______ _______
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// |       |       |      <   |   |_|   |_|       |
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//
// This file is part of the Marvin open source library and is licensed under the terms of the MIT License.
//
// ========================================================================================================
 
#ifndef MARVIN_SVF_H
#define MARVIN_SVF_H
 
#include <marvin/library/marvin_Concepts.h>
namespace marvin::dsp::filters {
    template <FloatType SampleType>
    struct SVFResult {
        SampleType highpass;
        SampleType bandpass;
        SampleType lowpass;
        SampleType normalisedBandpass;
        SampleType bandShelf;
        SampleType lowShelf;
        SampleType highShelf;
        SampleType notch;
        SampleType allpass;
    };

    template <FloatType SampleType>
    class SVF {
    public:
        enum class FilterType {
            Highpass,
            Bandpass,
            Lowpass,
            NormalisedBandpass,
            BandShelf,
            LowShelf,
            HighShelf,
            Notch,
            Allpass
        };

        void initialise(double sampleRate);

        void setFrequency(SampleType newFrequency);

        void setResonance(SampleType newResonance);

        void setGainDb(SampleType newGainDb);

        [[nodiscard]] SVFResult<SampleType> operator()(SampleType x);

        [[nodiscard]] SampleType operator()(FilterType type, SampleType x);

        void reset();
 
    private:
        double m_sampleRate;
        SampleType m_g;
        SampleType m_R;
        SampleType m_k{ static_cast<SampleType>(0.0) };
        SampleType m_s1{ static_cast<SampleType>(0.0) };
        SampleType m_s2{ static_cast<SampleType>(0.0) };
    };
} // namespace marvin::dsp::filters
 
#endif