1 files changed, 47 insertions, 0 deletions
diff --git a/src/game.h b/src/game.h
new file mode 100644
index 0000000..5f14541
--- /dev/null
+++ b/src/game.h
@@ -0,0 +1,47 @@
+#include <array>
+#include <random>
+#include "screen.h"
+
+using Array2D = std::array<std::array<int, SCREEN_HEIGHT>, SCREEN_WIDTH>;
+
+// Two-dimensional array of ints
+struct Game {
+    Array2D display {};
+    Array2D swap {};
+};
+
+// random number generator function:
+int zeroOrOne() {
+    std::random_device rd;
+    std::mt19937 gen(rd());
+    std::uniform_int_distribution<> dis(0, 1);
+    return dis(gen);
+}
+
+// function to check if the cell will be alive or dead in the next generation
+bool isAlive(Array2D &game, int x, int y) {
+    int alive = 0;
+
+    // left test
+    if (x > 0 && game[x - 1][y] == 1) alive++;
+    // right test
+    if (x < SCREEN_WIDTH && game[x + 1][y] == 1) alive++;
+    // top test
+    if (y > 0 && game[x][y - 1] == 1) alive++;
+    // bottom test
+    if (y < SCREEN_HEIGHT && game[x][y + 1] == 1) alive++;
+    // top left test
+    if (x > 0 && y > 0 && game[x - 1][y - 1] == 1) alive++;
+    // top right test
+    if (x < SCREEN_WIDTH && y > 0 && game[x + 1][y - 1] == 1) alive++;
+    // bottom left test
+    if (x > 0 && y < SCREEN_HEIGHT && game[x - 1][y + 1] == 1) alive++;
+    // bottom right test
+    if (x < SCREEN_WIDTH && y < SCREEN_HEIGHT && game[x + 1][y + 1] == 1) alive++;
+
+    // if the cell is alive and has 2 or 3 neighbors, it stays alive or
+    // if the cell is dead and has exactly 3 neighbors, it comes to life
+    if ((game[x][y] == 1 && (alive == 2 || alive == 3)) || (game[x][y] == 0 && alive == 3)) return true;
+        // otherwise, the cell dies
+    else return false;
+}