ardour/ardour/scale.h

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/*
 * Copyright (C) 2026 Paul Davis <paul@linuxaudiosystems.com>
 *
 * 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.
 */
 
#pragma once
 
#include <string>
#include <vector>
 
#include "pbd/signals.h"
 
namespace ARDOUR {
 
enum MusicalModeType {
        AbsolutePitch,
        SemitoneSteps,
        WholeToneSteps,
        RatioSteps,
        RatioFromRoot,
        MidiNote,
};
 
enum MusicalModeCulture {
        WesternEurope12TET,
        Byzantine,
        Maqams,
        Hindustani,
        Carnatic,
        SEAsia,
        China
};
 
class MusicalMode {
   public:
 
        enum Name {
                IonianMajor,
                AeolianMinor,
                Dorian,
                HarmonicMinor,
                MelodicMinorAscending,
                MelodicMinorDescending,
                Phrygian,
                Lydian,
                Mixolydian,
                Locrian,
                PentatonicMajor,
                PentatonicMinor,
                Chromatic,
                BluesScale,
                NeapolitanMinor,
                NeapolitanMajor,
                Oriental,
                DoubleHarmonic,
                Enigmatic,
                Hirajoshi,
                HungarianMinor,
                HungarianMajor,
                Kumoi,
                Iwato,
                Hindu,
                Spanish8Tone,
                Pelog,
                HungarianGypsy,
                Overtone,
                LeadingWholeTone,
                Arabian,
                Balinese,
                Gypsy,
                Mohammedan,
                Javanese,
                Persian,
                Algerian
        };
 
        MusicalMode (std::string const & name, MusicalModeType type, std::vector<float> const & elements);
        MusicalMode (MusicalMode const & other);
        MusicalMode (MusicalMode::Name);
        MusicalMode (std::ifstream& file); /* Read from a Scala file */
 
        MusicalMode operator= (MusicalMode const & other);
 
        std::string name() const { return _name; }
        MusicalModeType type() const { return _type; }
        int size() const { return _elements.size(); }
        std::vector<float> const & elements() const { return _elements; }
 
        std::vector<float> pitches_from_root (float root, int steps) const;
        std::vector<int> as_midi (int scale_root) const;
        void set_name (std::string const & str);
 
        PBD::Signal<void()> NameChanged;
        PBD::Signal<void()> Changed;
 
   protected:
        std::string _name;
        MusicalModeType _type;
        std::vector<float> _elements;
 
        void fill (Name);
 
        std::vector<float> absolute_pitch_pitches_from_root (float root, int steps) const;
        std::vector<float> semitone_steps_pitches_from_root (float root, int steps) const;
        std::vector<float> wholetone_steps_pitches_from_root (float root, int steps) const;
        std::vector<float> ratio_steps_pitches_from_root (float root, int steps) const;
        std::vector<float> ratio_from_root_pitches_from_root (float root, int steps) const;
        std::vector<float> midi_note_pitches_from_root (float root, int steps) const;
 
        std::vector<int> absolute_pitch_as_midi (int root) const;
        std::vector<int> semitone_steps_as_midi (int root) const;
        std::vector<int> wholetone_steps_as_midi (int root) const;
        std::vector<int> ratio_steps_as_midi (int root) const;
        std::vector<int> ratio_from_root_as_midi (int root) const;
        std::vector<int> midi_note_as_midi (int root) const;
};
 
 
class MusicalKey : public MusicalMode
{
    public:
        MusicalKey (float root, MusicalMode const &);
        MusicalKey (MusicalKey const & other);
 
        MusicalKey operator= (MusicalKey const & other);
 
        float root() const { return _root; }
        float nth (int n) const;
 
   private:
        float _root;
 
};
 
} // namespace