add colour

src/window/renderer.h

@@ -1,12 +1,26 @@
 #pragma once
 #include <SDL2/SDL.h>
+
 #include "../game/game.h"
 
 #define SCREEN_WIDTH 256
 #define SCREEN_HEIGHT (SCREEN_WIDTH * 2)
-#define BLOCK_WIDTH (SCREEN_WIDTH / 16)
+#define BLOCK_WIDTH (SCREEN_WIDTH / COLUMNS)
 #define BLOCK_HEIGHT (SCREEN_HEIGHT / (BLOCK_WIDTH * 2))
 
+// fits colours in a 3 bit length
+// 4th bit is unused
+typedef enum {
+    BLACK = 0,
+    RED = 1,
+    GREEN = 2,
+    BLUE = 4,
+    YELLOW = RED | GREEN,
+    CYAN = GREEN | BLUE,
+    MAGENTA = BLUE | RED,
+    WHITE = RED | GREEN | BLUE,
+} Colour;
+
 typedef struct {
     SDL_Window* window;
     SDL_Renderer* renderer;