Vespula/musicgenerator.cpp at master · noah-black/Vespula · GitHub

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#include "musicgenerator.h"

MusicGenerator::MusicGenerator(Keyboard **keyboard, NoteFactory *noteFactory,
                               WaveTable *waveTable)
    : keyboard(keyboard), noteFactory(noteFactory), waveTable(waveTable) {
  srand(time(NULL));
  notes.push_back(std::vector<PossibleNote>());
  notes.push_back(std::vector<PossibleNote>());
  notes.push_back(std::vector<PossibleNote>());
  notes.push_back(std::vector<PossibleNote>());
  notes.push_back(std::vector<PossibleNote>());
  notes.push_back(std::vector<PossibleNote>());

  notes[0].push_back(PossibleNote(n1, 40));
  notes[0].push_back(PossibleNote(n5, 40));

  notes[1].push_back(PossibleNote(n1, 40));
  notes[1].push_back(PossibleNote(n3, 40));
  notes[1].push_back(PossibleNote(n5, 40));

  notes[2].push_back(PossibleNote(n1, 30));
  notes[2].push_back(PossibleNote(n2, 1));
  notes[2].push_back(PossibleNote(n3, 30));
  notes[2].push_back(PossibleNote(n5, 30));
  notes[2].push_back(PossibleNote(n6, 1));
  notes[2].push_back(PossibleNote(n7, 8));

  notes[3].push_back(PossibleNote(n1, 20));
  notes[3].push_back(PossibleNote(n2, 3));
  notes[3].push_back(PossibleNote(n3, 20));
  notes[3].push_back(PossibleNote(n5, 20));
  notes[3].push_back(PossibleNote(n6, 3));
  notes[3].push_back(PossibleNote(n7, 8));

  notes[4].push_back(PossibleNote(n1, 20));
  notes[4].push_back(PossibleNote(n2, 3));
  notes[4].push_back(PossibleNote(n3, 20));
  notes[4].push_back(PossibleNote(n5, 20));
  notes[4].push_back(PossibleNote(n6, 3));
  notes[4].push_back(PossibleNote(n7, 8));

  notes[5].push_back(PossibleNote(n1, 20));
  notes[5].push_back(PossibleNote(n2, 3));
  notes[5].push_back(PossibleNote(n3, 20));
  notes[5].push_back(PossibleNote(n5, 20));
  notes[5].push_back(PossibleNote(n6, 3));
  notes[5].push_back(PossibleNote(n7, 8));

  waveforms.push_back(&WaveTable::triangle);
  waveforms.push_back(&WaveTable::sine);
  waveforms.push_back(&WaveTable::square);
  waveforms.push_back(&WaveTable::sawtooth);
}

void MusicGenerator::advance() {
  return;
  if (rand() % (int)(SAMPLE_RATE) / 12 == 0) {
    int octave, durationInSamples, left, weightTotal;
    unsigned i, j;
    double velocity, freq, freq1, freq2;
    PossibleNote n;
    Note *note1, *note2;
    Oscillator *oscillator1, *oscillator2;
    Envelope *envelope;
    waveformType waveform;

    durationInSamples =
        rand() % ((int)SAMPLE_RATE * 4) + (int)(SAMPLE_RATE / 4);

    weightTotal = 0;
    for (i = 0; i < notes.size(); i++) {
      for (j = 0; j < notes[i].size(); j++) {
        weightTotal += notes[i][j].prob;
      }
    }

    left = rand() % weightTotal;
    for (i = 0; i < notes.size(); i++) {
      for (j = 0; j < notes[i].size(); j++) {
        if (left - notes[i][j].prob < 0) {
          n = notes[i][j];
          break;
        } else
          left -= notes[i][j].prob;
      }
      if (left - notes[i][j].prob < 0)
        break;
    }

    velocity = ((double)((rand() % 80) + 20)) / 100;
    octave = i - 3;
    freq = (*keyboard)->getFreq(n.n, octave);
    freq1 = freq * (1 + (1.0 / 400.0));
    freq2 = freq * (1 - (1.0 / 400.0));
    envelope = noteFactory->getEnvelope(0);
    waveform = waveforms[rand() % waveforms.size()];
    oscillator1 = new Oscillator(waveTable, waveform, freq1);
    oscillator2 = new Oscillator(waveTable, waveform, freq2);
    oscillator1 = noteFactory->getOscillator(freq1, waveform);
    oscillator2 = noteFactory->getOscillator(freq2, waveform);
    note1 = new Note(oscillator1, envelope, freq1, n.n, velocity);
    note2 = new Note(oscillator2, envelope, freq2, n.n, velocity);
    noteFactory->prepareNote(note1);
    noteFactory->prepareNote(note2);
    note1->setReleaseSample(durationInSamples);
    note2->setReleaseSample(durationInSamples);
    (*keyboard)->playNote(note1);
    (*keyboard)->playNote(note2);
  }
}