feat(audio): add per-channel volume control and config reload

include/Cubed/app.hpp

@@ -49,6 +49,7 @@ public:
     ClientWorld& client_world();
     ServerWorld& server_world();
     const Argument& argument() const;
+    AudioEngine& audio();
 
 private:
     Camera m_camera;

include/Cubed/audio/audio_engine.hpp

@@ -30,7 +30,10 @@ public:
                  bool check = false);
     void update_listener(const glm::vec3& pos, const glm::vec3& forward,
                          const glm::vec3& up);
-    void update(float dt);
+    void update();
+    void reload_config();
+
+    float& bgm_target_volume();
 
 private:
     using FadeMap = std::unordered_map<std::string, AudioFade>;
@@ -42,5 +45,8 @@ private:
     FadeMap m_fade_map;
     SoundManager m_sounds;
     std::shared_ptr<SourcePool> m_pool;
+
+    float m_music_volume = 1.0f;
+    float m_sfx_volume = 1.0f;
 };
 } // namespace Cubed

include/Cubed/audio/audio_fade.hpp

@@ -12,7 +12,6 @@ private:
     float m_in_duration = 0.0f;
     float m_out_duration = 0.0f;
     float m_start_gain = 0.0f;
-    float m_end_gain = 0.0f;
     bool m_fade_in = true;
     bool m_active = true;
 };

include/Cubed/audio/audio_source.hpp

@@ -9,7 +9,7 @@ enum class AudioState { INITIAL, PLAYING, PAUSED, STOPPED };
 
 class AudioSource {
 public:
-    AudioSource();
+    AudioSource(float volume = 1.0f);
     ~AudioSource();
 
     void set_buffer_2d(const AudioBuffer& buffer);
@@ -25,7 +25,9 @@ public:
     void pause();
     float duration() const;
     float current_time() const;
-    float volume() const;
+    float target_volume() const;
+    float& target_volume();
+    void set_target_volume(float volume);
     AudioState state() const;
 
     void mark_in_use();
@@ -34,7 +36,7 @@ public:
 
 private:
     ALuint m_source = 0;
-    float m_volume = 1.0f;
+    float m_target_volume = 1.0f;
     float m_duration = 0.0f;
     bool m_using;
 };

include/Cubed/dev_panel.hpp

@@ -20,6 +20,8 @@ class DevPanel {
         bool is_enable_aniso = false;
         bool is_support_aniso = true;
         bool is_reload = true;
+        float volume_music = 1.0f;
+        float volume_sfx = 1.0f;
     };
     struct PlayerProfile {
         int game_mode = 0;