63 lines
2.4 KiB
C++
63 lines
2.4 KiB
C++
#ifndef CELLULAR_AUTOMATA_STRATEGY_H
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#define CELLULAR_AUTOMATA_STRATEGY_H
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#include "MelodyStrategy.h"
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#include <Arduino.h>
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class CellularAutomataStrategy : public MelodyStrategy {
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public:
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void generate(Step (*sequence)[NUM_STEPS], int track, int numSteps, int* scaleNotes, int numScaleNotes, int* chordNotes, int numChordNotes, int seed, int intensity) override {
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randomSeed(seed);
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int* sourceNotes = (numChordNotes > 0) ? chordNotes : scaleNotes;
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int sourceNoteCount = (numChordNotes > 0) ? numChordNotes : numScaleNotes;
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if (sourceNoteCount == 0) return;
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bool cells[NUM_STEPS];
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for (int i = 0; i < numSteps; i++) {
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cells[i] = (random(100) < (intensity * 8)); // Initial density
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}
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int rule = random(256); // Wolfram rule
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for (int gen = 0; gen < 4; gen++) { // A few generations
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bool next_cells[NUM_STEPS];
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for (int i = 0; i < numSteps; i++) {
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bool left = cells[(i - 1 + numSteps) % numSteps];
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bool middle = cells[i];
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bool right = cells[(i + 1) % numSteps];
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int index = (left << 2) | (middle << 1) | right;
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next_cells[i] = (rule >> index) & 1;
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}
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memcpy(cells, next_cells, sizeof(cells));
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}
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for (int i = 0; i < numSteps; i++) {
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if (cells[i]) {
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int octave = 3 + random(3);
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sequence[track][i].note = 12 * octave + sourceNotes[random(sourceNoteCount)];
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sequence[track][i].accent = (random(100) < 20);
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sequence[track][i].tie = false;
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} else {
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sequence[track][i].note = -1;
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sequence[track][i].accent = false;
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sequence[track][i].tie = false;
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}
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}
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randomSeed(micros());
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}
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void generateScale(int* scaleNotes, int& numScaleNotes) override {
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// This strategy doesn't generate its own scales, but the method must be implemented.
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}
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void mutate(Step (*sequence)[NUM_STEPS], int track, int numSteps, int* scaleNotes, int numScaleNotes, int* chordNotes, int numChordNotes, int intensity) override {
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// For simplicity, just regenerate with a new seed.
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generate(sequence, track, numSteps, scaleNotes, numScaleNotes, chordNotes, numChordNotes, random(65536), intensity);
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}
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const char* getName() override {
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return "Cellular";
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}
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};
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#endif |