Sound volume is controllable from settings menu

#7

3 files changed, 21 insertions, 3 deletions

@@ -65,8 +65,11 @@ void MenuSystem::openPauseMenu() {
                                     game_.getMixer().setMusicVolume(menuItem.value);
                                   }),
                      MenuBuilder().Slider("Sound Volume: ")
-                                  .InitialValue(10)
-                                  .MaxValue(10),
+                                  .InitialValue(game_.getMixer().getSoundVolume())
+                                  .MaxValue(10)
+                                  .SelectionChangedFunction([this] (MenuItem& menuItem) {
+                                    game_.getMixer().setSoundVolume(menuItem.value);
+                                  }),
                      MenuBuilder().Command("Back")
                                   .ActivationFunction([this] (Game& game) {
                                     closePauseMenu();
@@ -4,9 +4,12 @@
 void Mixer::playSound(std::string_view filename) {
   Mix_Chunk* chunk = getChunkByFilename(std::string(filename));
 
-  if (Mix_PlayChannel(-1, chunk, 0) == -1) {
+  int ret = Mix_PlayChannel(-1, chunk, 0);
+  if (ret == -1) {
     throw mix_error();
   }
+
+  Mix_Volume(ret, soundVolume_);
 }
 
 int Mixer::loopSound(std::string_view filename) {
@@ -17,6 +20,8 @@ int Mixer::loopSound(std::string_view filename) {
     throw mix_error();
   }
 
+  Mix_Volume(ret, soundVolume_);
+
   return ret;
 }
 
@@ -32,6 +37,11 @@ void Mixer::unpauseSounds() {
   Mix_Resume(-1);
 }
 
+void Mixer::setSoundVolume(int vol) {
+  soundVolume_ = MIX_MAX_VOLUME / 10.0 * vol;
+  Mix_Volume(-1, soundVolume_);
+}
+
 void Mixer::playMusic(std::string_view name, int ms) {
   Mix_Music* song = getMusicByName(name);
   int ret;
@@ -77,6 +77,10 @@ public:
 
   void unpauseSounds();
 
+  int getSoundVolume() const { return std::round(static_cast<double>(soundVolume_) / MIX_MAX_VOLUME * 10); }
+
+  void setSoundVolume(int vol);
+
   // name is the name of the file, not containing the extension
   // ms is the time in milliseconds to fade in
   void playMusic(std::string_view name, int ms = 0);
@@ -113,6 +117,7 @@ private:
   std::string playingTrack_;
   int musicVolume_ = MIX_MAX_VOLUME;
   bool musicMuted_ = false;
+  int soundVolume_ = MIX_MAX_VOLUME;
 };
 
 #endif /* end of include guard: MIXER_H_6DF82000 */