add colour definitions

src/window/colour/colour32.h

@@ -0,0 +1,24 @@
+#pragma once
+#include <stdint.h>
+
+// fits colours with each channel having a width of 2 bits
+typedef union {
+    uint32_t packed;
+    struct {
+        uint8_t a;
+        uint8_t b;
+        uint8_t g;
+        uint8_t r;
+    };
+} colour32;
+#define color32 colour32
+
+#define COLOUR32_BLACK   ((colour32){0x000000FF})
+#define COLOUR32_RED     ((colour32){0xFF0000FF})
+#define COLOUR32_YELLOW  ((colour32){0xFFFF00FF})
+#define COLOUR32_ORANGE  ((colour32){0xFF6D00FF})
+#define COLOUR32_GREEN   ((colour32){0x00FF00FF})
+#define COLOUR32_CYAN    ((colour32){0x00FFFFFF})
+#define COLOUR32_BLUE    ((colour32){0x0000FFFF})
+#define COLOUR32_MAGENTA ((colour32){0xFF00FFFF})
+#define COLOUR32_WHITE   ((colour32){0xFFFFFFFF})

src/window/colour/colour8.h

@@ -0,0 +1,39 @@
+#pragma once
+#include <stdint.h>
+
+// fits colours with each channel having a width of 2 bits
+typedef union {
+    uint8_t packed;
+    struct {
+        uint8_t b : 2;
+        uint8_t g : 3;
+        uint8_t r : 3;
+    };
+} colour8;
+#define color8 colour8
+
+/*                                          rrrg ggbb */
+#define COLOUR8_BLACK   ((colour8){0x00}) // 0000 0000
+#define COLOUR8_RED     ((colour8){0xE0}) // 1110 0000
+#define COLOUR8_YELLOW  ((colour8){0xFC}) // 1111 1100
+#define COLOUR8_ORANGE  ((colour8){0xEC}) // 1111 1100
+#define COLOUR8_GREEN   ((colour8){0x1C}) // 0001 1100
+#define COLOUR8_CYAN    ((colour8){0x1F}) // 0001 1111
+#define COLOUR8_BLUE    ((colour8){0x03}) // 0000 0011
+#define COLOUR8_MAGENTA ((colour8){0xE3}) // 1110 0011
+#define COLOUR8_WHITE   ((colour8){0xFF}) // 1111 1111
+
+// gets the red channel in 32 bit colour space
+static inline uint8_t colour8_red32(colour8 const colour) {
+    return colour.r * (255 / 7);
+}
+
+// gets the green channel in 32 bit colour space
+static inline uint8_t colour8_green32(colour8 const colour) {
+    return colour.g * (255 / 7);
+}
+
+// gets the blue channel in 32 bit colour space
+static inline uint8_t colour8_blue32(colour8 const colour) {
+    return colour.b * (255 / 3);
+}

src/window/renderer.c

@@ -7,6 +7,8 @@
 
 #include "../errors.h"
 #include "../game/game.h"
+#include "colour/colour32.h"
+#include "colour/colour8.h"
 
 
 // initializes the window and renderer
@@ -28,13 +30,23 @@ void renderer_init(render_data* const render_dat, game_data const* const game_da
     };
 }
 
+// sets the colour32 from the colour8
+static inline void set_colour32(SDL_Renderer* const renderer, colour32 const c) {
+    (void)SDL_SetRenderDrawColor(renderer, c.r, c.g, c.b, c.a);
+}
+
+// sets the colour32 from the colour8
+//static inline void set_colour8(SDL_Renderer* const renderer, colour8 const c) {
+//    (void)SDL_SetRenderDrawColor(renderer, colour8_red32(c), colour8_green32(c), colour8_blue32(c), 0xFF);
+//}
+
 void renderer_update(const render_data* render_data) {
     SDL_Renderer* renderer = render_data->renderer;
 
     int success = 0; // if an error occurs, this value is <0
 
     // clear render
-    success |= SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0x00, 0x50);
+    set_colour32(renderer, COLOUR32_BLACK);
     success |= SDL_RenderClear(renderer);
 
     if (success < 0) {