synchronise with the template

- use the version of audio management which doesn't crash the
application if something goes wrong
- include colour32
- update error management to be more reflective of the one defined in
the template
- modify the renderer functions to be more reflective of the template
- modify the game functions to be more reflective of the template (& use
a more failproof method of initializing)
- add gametime
- remove set_gamestatus logic and just use a run boolean in gamedata
- remove emscripten preprocessors as those haven't really been used

src/game/game.h

@@ -1,10 +1,19 @@
 #pragma once
-
+#include <SDL_scancode.h>
+#include <math.h>
+#include <stdbool.h>
 #include <stdint.h>
 
 #include "../window/audio.h"
-#include "../window/colour8.h"
-#include "tetromino/shapes.h"
+#include "../window/colour/colour8.h"
+#include "./tetromino/shapes.h"
+#include "gametime.h"
+
+// constants for pi(π) and tau(τ)
+#define PI   (M_PI)         // π constant
+#define TAU  (M_PI * 2.0)   // τ constant
+#define PIf  (M_PIf)        // π constant as a 32-bit floating point
+#define TAUf (M_PIf * 2.0F) // τ constant as a 32-bit floating point
 
 // stores the data used in the game
 #define COLUMNS ((int8_t)10)
@@ -15,8 +24,9 @@ typedef colour8* row;
 
 typedef struct {
     row rows[ROWS];
-    audio_device* audio_device;
-    audio_data music;
+    gametime* time;
+    audiodevice* audio_device;
+    audiodata music;
     uint32_t timer_music;
     uint32_t timer_update;
     uint32_t timer_input;
@@ -25,9 +35,10 @@ typedef struct {
     uint8_t curr_idx; // current shape index
     int8_t sel_x;     // selected shape x position
     int8_t sel_y;     // selected shape y position
-} game_data;
+    bool run;
+} gamedata;
 
-void next_shape(game_data* dat);
-void game_init(game_data* dat);                        // initializes the game
-void game_update(game_data* dat, uint8_t const* keys); // updates the game's state
-void game_free(game_data* dat);                        // free all data stored with the game
+void next_shape(gamedata*);           // initializes everything needed to start the game; outputs to gamedata
+void game_init(gamedata*, gametime*); // initializes the game
+void game_update(gamedata*);          // causes an update to occur within the game
+void game_free(gamedata*);            // frees the resources associated with the game