1 files changed, 62 insertions, 0 deletions
diff --git a/ROMs/life.c b/ROMs/life.c
new file mode 100644
index 0000000..f35f9d0
--- /dev/null
+++ b/ROMs/life.c
@@ -0,0 +1,62 @@
+#include "std.c"
+#include "hid.c"
+#include "screen.c"
+
+#define GRID_SIZE   64
+#define GRID_BYTES  8
+#define GRID_WIDTH  8
+#define GRID_HEIGHT 8
+
+char getState(char* grid, int index)
+{
+    int byteIndex = index / 8;
+    int bitIndex  = index % 8;
+    int byte      = grid[byteIndex];
+
+    return ((byte >> bitIndex) & 1) != 0;
+}
+
+int setState(char* grid, int index, int state)
+{
+    int byteIndex = index / 8;
+    int bitIndex  = index % 8;
+    int byte      = grid[byteIndex];
+    
+    if (state)
+        byte |= (1 << bitIndex);
+    else
+        byte &= ~(1 << bitIndex);
+    
+    grid[byteIndex] = byte;
+}
+
+int drawGrid(char* grid)
+{
+    screen_clear(COLOR_BLACK);
+
+    for (int y = 0; y < GRID_HEIGHT; y++)
+    {
+        for (int x = 0; x < GRID_WIDTH; x++)
+        {
+            int index = (y * GRID_WIDTH) + x;
+            if (getState(grid, index))
+                screen_setPixel(x, y, COLOR_WHITE);
+        }
+    }
+}
+
+int main()
+{
+    char* grid = new char[GRID_BYTES];
+
+    // clear memory
+    for (int i = 0; i < GRID_BYTES; i++)
+        grid[i] = 0;
+
+    // turn on pixel at (0,0)
+    setState(grid, 0, 1);
+
+    drawGrid(grid);
+
+    while (1) { }
+}
+\ No newline at end of file