Add music, fix main menu scene

game/game_state.h

@@ -5,6 +5,7 @@
 #include <flecs.h>
 
 #include "constants.h"
+#include "sounds.h"
 
 typedef enum GameScreen {
     SCREEN_GAME,
@@ -88,11 +89,28 @@ typedef struct Game {
     ecs_query_t *drawQuery;
 } Game;
 
+extern ecs_world_t *ECS;
 static void setScreen(Game *game, GameScreen newScreen) {
+    SoundState *soundState = ecs_singleton_get_mut(ECS, SoundState);
     game->nextScreen = newScreen;
+    switch (newScreen) {
+        case SCREEN_GAME:
+        case SCREEN_PAUSE_MENU:
+            if (game->screen == SCREEN_MAIN_MENU) {
+                soundsLoadMusicStream(soundState, "assets/music/mainloop.ogg");
+                soundsPlayMusicStream(soundState);
+            }
+            break;
+        case SCREEN_MAIN_MENU:
+        case SCREEN_SETTINGS:
+            if (game->screen == SCREEN_GAME || game->screen == SCREEN_PAUSE_MENU) {
+                soundsLoadMusicStream(soundState, "assets/music/title.ogg");
+                soundsPlayMusicStream(soundState);
+            }
+            break;
+    }
 }
 
-extern ecs_world_t *ECS;
 
 extern ECS_COMPONENT_DECLARE(Game); // defined in main.c