5-7. 7조 AudioSource & AudioMixer, SaveLoad

1. AudioMixer

• 씬이 넘어가더라도 볼륨이 유지되도록 수정
• 기본값을 정해두고 변경값은 저장

  [SerializeField] private AudioMixer m_AudioMixer;
  [SerializeField] private Slider m_MusicMasterSlider;
  [SerializeField] private Slider m_MusicBGMSlider;
  [SerializeField] private Slider m_MusicSFXSlider;
  
  private const string MasterVolumeKey = "MasterVolume";
  private const string BGMVolumeKey = "BGMVolume";
  private const string SFXVolumeKey = "SFXVolume";
  
  private void Awake()
  {
      m_MusicMasterSlider.onValueChanged.AddListener(SetMasterVolume);
      m_MusicBGMSlider.onValueChanged.AddListener(SetMusicVolume);
      m_MusicSFXSlider.onValueChanged.AddListener(SetSFXVolume);
  }
  
  private void Start()
  {
      LoadVolumeSettings();
  }
  
  public void SetMasterVolume(float volume)
  {
      m_AudioMixer.SetFloat("Master", Mathf.Log10(volume) * 20);
      PlayerPrefs.SetFloat(MasterVolumeKey, volume);
      PlayerPrefs.Save();
  }
  
  public void SetMusicVolume(float volume)
  {
      m_AudioMixer.SetFloat("BGM", Mathf.Log10(volume) * 20);
      PlayerPrefs.SetFloat(BGMVolumeKey, volume);
      PlayerPrefs.Save();
  }
  
  public void SetSFXVolume(float volume)
  {
      m_AudioMixer.SetFloat("SFX", Mathf.Log10(volume) * 20);
      PlayerPrefs.SetFloat(SFXVolumeKey, volume);
      PlayerPrefs.Save();
  }
  
  public void LoadVolumeSettings()
  {
      float masterVolume = PlayerPrefs.GetFloat(MasterVolumeKey, 1f);
      float bgmVolume = PlayerPrefs.GetFloat(BGMVolumeKey, 1f);
      float sfxVolume = PlayerPrefs.GetFloat(SFXVolumeKey, 1f);
  
      m_MusicMasterSlider.value = masterVolume;
      m_MusicBGMSlider.value = bgmVolume;
      m_MusicSFXSlider.value = sfxVolume;
  
      ApplyVolumeToMixer(masterVolume, bgmVolume, sfxVolume);
  }
  
  private void ApplyVolumeToMixer(float masterVolume, float bgmVolume, float sfxVolume)
  {
      m_AudioMixer.SetFloat("Master", Mathf.Log10(masterVolume) * 20);
      m_AudioMixer.SetFloat("BGM", Mathf.Log10(bgmVolume) * 20);
      m_AudioMixer.SetFloat("SFX", Mathf.Log10(sfxVolume) * 20);
  }

2. SaveLoad

• 스테이지 이름을 JSON으로 저장

  public class SaveLoad : MonoBehaviour
  {
      public static SaveLoad Instance { get; private set; }
  
      private string saveFilePath;
  
      private void Awake()
      {
          if (Instance == null)
          {
              Instance = this;
              DontDestroyOnLoad(gameObject);
  
              saveFilePath = Application.persistentDataPath + "/saveData.json";
          }
          else
          {
              Destroy(gameObject);
          }
      }
  
      [System.Serializable]
      private class SaveData
      {
          public string savedStage;
      }
  
      public void SaveCurrentStage(string stageName)
      {
          try
          {
              SaveData data = new SaveData { savedStage = stageName };
              string json = JsonUtility.ToJson(data, true);
              File.WriteAllText(saveFilePath, json);
              Debug.Log($"�������� '{stageName}'�� {saveFilePath}�� ����Ǿ����ϴ�.");
          }
          catch (IOException e)
          {
              Debug.LogError($"�������� ���� �� ���� �߻�: {e.Message}");
          }
      }
  
      public string LoadSavedStage()
      {
          StorySceneManager.firstStoryCount = StorySceneManager.fullStoryCount;
          try
          {
              if (File.Exists(saveFilePath))
              {
                  string json = File.ReadAllText(saveFilePath); // ���� �б�
                  SaveData data = JsonUtility.FromJson<SaveData>(json);
                  Debug.Log($"����� �������� '{data.savedStage}'�� �ε�Ǿ����ϴ�.");
                  return data.savedStage;
              }
              else
              {
                  Debug.LogWarning("���� ������ �������� �ʾ� �⺻��('Stage1')�� ��ȯ�մϴ�.");
                  return "Stage1";
              }
          }
          catch (IOException e)
          {
              Debug.LogError($"�������� �ε� �� ���� �߻�: {e.Message}");
              return "Stage1";
          }
      }
  }

+ 스크립트로 AudioSource를 가져오고 AudioMixer를 활용

• 하나의 씬에서 경우에 따라 다른 음악 재생

  (코드의 일부)

  [SerializeField] private AudioClip successBGM;
  [SerializeField] private AudioClip failureBGM;
  [SerializeField] private AudioSource audioSource;	// bgm재생용
  [SerializeField] private AudioMixerGroup bgmMixerGroup;
  
  private void Awake()
  {
    if (audioSource == null)
    {
        audioSource = gameObject.AddComponent<AudioSource>();
    }
    audioSource.outputAudioMixerGroup = bgmMixerGroup;
  }
  
  private void StorySceneFirstImage()
  {
    if (firstStoryCount == 0 && !Finish.AllClearCheck)
    {
    }
    else if (firstStoryCount == fullStoryCount && !Finish.AllClearCheck)
    {
        PlayBGM(failureBGM);
    }
    else if (firstStoryCount == fullStoryCount &&Finish.AllClearCheck)
    {
        PlayBGM(successBGM);
    }
  }
  
  private void PlayBGM(AudioClip clip)
  {
    if (clip == null)
    {
        return;
    }
    audioSource.clip = clip;
    audioSource.Play();
  }