/*
  https://www.youtube.com/watch?v=FWSR_7kZuYg
  https://en.wikipedia.org/wiki/Conway's_Game_of_Life
  - Any live cell with fewer than two live neighbours dies, as if by underpopulation.
  - Any live cell with two or three live neighbours lives on to the next generation.
  - Any live cell with more than three live neighbours dies, as if by overpopulation.
  - Any dead cell with exactly three live neighbours becomes a live cell, as if by reproduction.
*/

#include <Adafruit_SSD1306.h>
#define WIDTH  128
#define HEIGHT  64
#define RESET      4
#define ADDRESS 0x3C
Adafruit_SSD1306 display(WIDTH, HEIGHT, &Wire, RESET);

#define ARRAY_SIZE WIDTH * HEIGHT
bool oldworld[WIDTH][HEIGHT];
bool newworld[WIDTH][HEIGHT];

unsigned long timer, timeout = 250; // 250ms

void setup()
{
  randomSeed(analogRead(0)); // invoke pseudo-randomn rather than static-random (without it)
  Serial.begin(115200);
  display.begin(SSD1306_SWITCHCAPVCC, ADDRESS);
  display.clearDisplay();
  display.display();
}

void loop()
{
  if (millis() - timer > timeout) {
    makeworld();
  }
}

void makeworld()
{
  for (int y = 0; y < HEIGHT; y++) {
    for (int x = 0; x < WIDTH; x++) {
      byte life = random(2);
      display.drawPixel(x, y, life);
      newworld[x][y] = life;
    }
  }
  display.display();
}