convert colour to a 2 bit format

src/window/colour.h

@@ -0,0 +1,22 @@
+#pragma once
+
+// fits colours with each channel having a width of 2 bits
+#include <stdint.h>
+
+typedef union {
+    uint8_t packed;
+    struct {
+        uint8_t a : 2;
+        uint8_t b : 2;
+        uint8_t g : 2;
+        uint8_t r : 2;
+    };
+} Colour;
+
+#define COLOUR_RED      ((Colour){0b11000011})
+#define COLOUR_YELLOW   ((Colour){0b11110011})
+#define COLOUR_ORANGE   ((Colour){0b11100011})
+#define COLOUR_GREEN    ((Colour){0b00110011})
+#define COLOUR_CYAN     ((Colour){0b00111111})
+#define COLOUR_BLUE     ((Colour){0b00001111})
+#define COLOUR_MAGENTA  ((Colour){0b11001111})

src/window/renderer.c

@@ -5,6 +5,7 @@
 #include <stdio.h>
 
 #include "../errors.h"
+#include "colour.h"
 #include "renderer.h"
 
 
@@ -40,12 +41,12 @@ void renderer_update(const RenderData* render_data) {
         Row row = data->row[y];
 
         for (uint8_t x = 0; x < COLUMNS; x++) {
-            if (row.columns[x].block != 0) {
+            if (row.columns[x].packed != 0) {
                 success |= SDL_SetRenderDrawColor(renderer,
-                                                  0xFF * !!(row.columns[x].block & RED),
-                                                  0xFF * !!(row.columns[x].block & GREEN),
-                                                  0xFF * !!(row.columns[x].block & BLUE),
-                                                  0xFF);
+                                                  0x55 * row.columns[x].r, // repeat the 2 bits by multiplying by 0x55
+                                                  0x55 * row.columns[x].g,
+                                                  0x55 * row.columns[x].b,
+                                                  0x55 * row.columns[x].a);
                 success |= SDL_RenderFillRect(renderer, &(SDL_Rect){x * BLOCK_WIDTH + 1, y * BLOCK_HEIGHT + 1, BLOCK_WIDTH - 1, BLOCK_HEIGHT - 1});
             }
         }

src/window/renderer.h

@@ -1,5 +1,6 @@
 #pragma once
 #include <SDL2/SDL.h>
+#include <stdint.h>
 
 #include "../game/game.h"
 
@@ -8,19 +9,6 @@
 #define BLOCK_WIDTH (SCREEN_WIDTH / COLUMNS)
 #define BLOCK_HEIGHT (SCREEN_HEIGHT / ROWS)
 
-// 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;