Add sound, format code

Makefile

@@ -1,6 +1,6 @@
 CPPFLAGS = -D_DEFAULT_SOURCE -D_FOTIFY_SOURCE=2
 CFLAGS   = $(CPPFLAGS) -std=c99 -pedantic -Wall -Wextra -march=native -mtune=native -O2
-LDFLAGS  = -Wl,-z,relro,-z,now,-O2 -lSDL2
+LDFLAGS  = -Wl,-z,relro,-z,now,-O2 -lSDL2 -lSDL2_mixer
 
 default: bin obj bin/chip8
 

src/main.c

@@ -1,4 +1,5 @@
 #include "SDL2/SDL.h"
+#include <SDL2/SDL_mixer.h>
 #include <signal.h>
 #include <stdint.h>
 #include <stdio.h>
@@ -41,6 +42,8 @@ SDL_Event e;
 SDL_Surface* s;
 SDL_Window* w;
 
+Mix_Chunk* buzzer;
+
 Uint32 fg;
 Uint32 bg;
 
@@ -81,6 +84,8 @@ init_chip8(void)
 void
 cleanup(void)
 {
+    Mix_FreeChunk(buzzer);
+    Mix_Quit();
     SDL_FreeSurface(s);
     SDL_DestroyWindow(w);
     SDL_Quit();
@@ -89,14 +94,19 @@ cleanup(void)
 uint_fast8_t
 init_SDL(const char* path)
 {
-    if (SDL_Init(SDL_INIT_VIDEO)) {
+    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO)) {
         fputs("ERROR: Failed to initialize SDL\n", stderr);
         return 0;
     }
 
     char caption[7 + strlen(path)];
     sprintf(caption, "CHIP-8 - %s", path);
-    w = SDL_CreateWindow(caption, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 64 * SCALE, 32 * SCALE, SDL_WINDOW_SHOWN);
+    w = SDL_CreateWindow(caption,
+                         SDL_WINDOWPOS_UNDEFINED,
+                         SDL_WINDOWPOS_UNDEFINED,
+                         64 * SCALE,
+                         32 * SCALE,
+                         SDL_WINDOW_SHOWN);
     if (!w) {
         fputs("ERROR: Failed to create a window\n", stderr);
         return 0;
@@ -108,6 +118,17 @@ init_SDL(const char* path)
         return 0;
     }
 
+    if (Mix_OpenAudio(44100, MIX_DEFAULT_FORMAT, 1, 2048)) {
+        fputs("ERROR: Failed to open audio\n", stderr);
+        return 0;
+    }
+
+    buzzer = Mix_LoadWAV("resources/buzzer.wav");
+    if (!buzzer) {
+        fputs("ERROR: Failed to load sound effects\n", stderr);
+        return 0;
+    }
+
     if (atexit(cleanup)) {
         fputs("ERROR: Failed to set exit function\n", stderr);
         SDL_FreeSurface(s);
@@ -531,8 +552,10 @@ timers()
     if (dt)
         --dt;
 
-    if (st)
+    if (st) {
+        Mix_PlayChannel(-1, buzzer, 0);
         --st;
+    }
 }
 
 int