peacock/plugin/ic29.hpp

/*
   Peacock-8 VA polysynth

   Copyright 2024 Gordon JC Pearce <gordonjcp@gjcp.net>

   Permission to use, copy, modify, and/or distribute this software for any
   purpose with or without fee is hereby granted, provided that the above
   copyright notice and this permission notice appear in all copies.

   THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
   SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
   OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
   CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#pragma once

#include "peacock.hpp"

class Envelope {
   public:
    Envelope();
    void run();
    void on() {
        phase = ENV_ATK;
    }

    void off() {
        phase = ENV_RLS;
    }

    bool inRelease() {
        return phase == ENV_RLS;
    }

    uint16_t level;

    // private:
    enum {
        ENV_ATK,
        ENV_DCY,
        ENV_RLS,
        ENV_IDLE
    } phase;
};

class Voice {
   public:
    Voice();
    uint8_t note = 0x3c;  // middle C
    void run(float *buffer, uint32_t samples);
    void update();
    void on(uint8_t note);
    void off();

   private:
    Envelope env;             // calculated envelope value
    uint16_t pitch = 0x1818;  // calculated pitch value with porta and master pitch etc
    float phase = 0, omega = 0;
    enum { V_DONE,
           V_OFF,
           V_ON } voiceState;

    void calcPitch();
};

class Synth {
    friend Envelope;
    friend Voice;

   public:
    Synth();
    void run();
    void voiceOn(uint8_t voice, uint8_t note);
    void voiceOff(uint8_t voice);
    void sustainSwitch(uint8_t val);
    void pitchBend(int16_t bend);
    void modWheel(uint8_t wheel);
    void buildTables(double sampleRate);

    double sampleRate;
    uint16_t masterPitch;  // sum of bend and LFO, plus any other pitch-setting value
                           // protected:
    uint16_t envAtk, envDcy, envStn, envRls;
    int8_t portaCoeff;
    bool sustained;
    double pitchTable[104];

    // private:
    int16_t lfoPitch;
    int16_t bendPitch;
    Voice voices[NUM_VOICES];

    void runLfo();
    void basePitch();
};

// global
extern Synth ic29;