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Docs/Architecture/11_AudioModule.md
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Docs/Architecture/11_AudioModule.md
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# 11 · 音频模块
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> **命名空间** `BaseGames.Audio`
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> **程序集** `BaseGames.Audio`
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> **路径** `Assets/Scripts/Audio/`
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> **依赖** `BaseGames.Core.Events`、`Unity AudioMixer`
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---
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## 目录
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1. [AudioMixer 架构](#1-audiomixer-架构)
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2. [AudioManager](#2-audiomanager)
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3. [BGMController](#3-bgmcontroller)
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4. [AudioZone](#4-audiozone)
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5. [AudioEventSO（SFX 集成）](#5-audioeventsso)
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6. [GlobalSFXPlayer](#6-globalsfxplayer)
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7. [AudioConfigSO](#7-audioconfigso)
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8. [音频事件频道清单](#8-音频事件频道清单)
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---
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## 1. AudioMixer 架构
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**资产路径**：`Assets/Audio/MainMixer.mixer`
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### 混音组层级
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```
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Master
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├── BGM (背景音乐)
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├── SFX (所有音效)
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│ ├── SFX_Player
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│ ├── SFX_Enemy
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│ └── SFX_World
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└── Ambient (环境音)
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```
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### Exposed Parameters（代码用字符串常量）
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```csharp
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// 路径: Assets/Scripts/Audio/AudioMixerKeys.cs
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public static class AudioMixerKeys
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{
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public const string Master = "MasterVolume";
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public const string BGM = "BGMVolume";
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public const string SFX = "SFXVolume";
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public const string Ambient = "AmbientVolume";
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}
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```
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所有参数范围：`-80 ~ 0 dB`
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### AudioMixer 快照
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| 快照名 | 触发条件 | 主要差异 |
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|--------|---------|---------|
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| `Default` | 正常 Gameplay | 全组正常 |
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| `Paused` | `GameState.Paused` | BGM/SFX -12 dB + 低通滤波 |
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| `Dead` | 玩家死亡 | BGM 渐出 -80 dB（1.5s）|
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| `BossFight` | Boss 战开始 | Ambient -20 dB |
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切换方式：
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```csharp
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_mixer.TransitionToSnapshots(new[] { snapshot }, new[] { 1f }, transitionTime);
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```
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---
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## 2. AudioManager
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```csharp
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// 路径: Assets/Scripts/Audio/AudioManager.cs
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[DefaultExecutionOrder(-500)]
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public class AudioManager : MonoBehaviour
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{
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[Header("AudioMixer")]
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[SerializeField] private AudioMixer _mixer;
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[Header("BGM Sources（双 Source 交叉淡入淡出）")]
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[SerializeField] private AudioSource _bgmSourceA;
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[SerializeField] private AudioSource _bgmSourceB;
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[Header("SFX Pool（4~8 源轮转，防高密度战斗音效戳断）")]
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[SerializeField] private AudioSource[] _sfxSources; // Inspector 预挂，建议 6 个，均路由到 SFX MixerGroup
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private int _sfxRoundRobin; // 轮转指针（无锁）
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[Header("Event Channels - Subscribe")]
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[SerializeField] private GameStateEventChannelSO _onGameStateChanged;
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[SerializeField] private StringEventChannelSO _onBossFightStarted; // ⚠️ bossId: string（与 02_EventSystem §4 / §3 BGMController 一致）
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// ── Singleton（已废弃：新代码请使用 ServiceLocator.Get<IAudioService>()）─────────────
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/// <summary>
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/// 已废弃。请改用 ServiceLocator.Get<IAudioService>() 访问音频服务。
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/// 保留此属性仅为历史层兴范过渡期兼容，将在下一个大版本移除。
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/// </summary>
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[System.Obsolete("Use ServiceLocator.Get<IAudioService>() instead. AudioManager.Instance will be removed in a future version.")]
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public static AudioManager Instance { get; private set; }
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private void Awake()
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{
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if (Instance != null) { Destroy(gameObject); return; }
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Instance = this;
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_activeBGMSource = _bgmSourceA;
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_inactiveBGMSource = _bgmSourceB;
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}
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private AudioSource _activeBGMSource;
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private AudioSource _inactiveBGMSource;
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private Coroutine _crossfadeCoroutine;
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// ── 音量（统一入口；SettingsManager / 设置面板调用）────────────
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public void Initialize(); // 读取 GlobalSettings 并应用所有音量
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/// <summary>
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/// 将指定混音器参数设置为 0-1 线性值（内部转换为 dB）。
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/// 唯一音量写入入口——所有调用方均使用此方法。
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/// </summary>
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/// <param name="exposedParam">AudioMixerKeys.* 常量（Master / BGM / SFX / Ambient）</param>
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public void SetVolume(string exposedParam, float linear)
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=> _mixer.SetFloat(exposedParam, LinearToDecibel(linear));
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// BGM 播放（带两段淡变时长）
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public void PlayBGM(AudioClip clip, float fadeOutDur = 1f, float fadeInDur = 1f);
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public void StopBGM(float fadeDuration = 1f);
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// SFX 一次性播放（轮转多源，避免高密度战斗时音效相互戳断）
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public void PlaySFX(AudioClip clip, float volumeScale = 1f)
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{
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var src = NextSFXSource();
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src.volume = volumeScale;
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src.PlayOneShot(clip); // PlayOneShot 不打断当前正在播放的其他音效
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}
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// 2D 游戏中位置参数不做 3D 衰减，统一个多源池路由
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public void PlaySFXAtPosition(AudioClip clip, Vector2 pos, float volumeScale = 1f)
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=> PlaySFX(clip, volumeScale);
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// 轮转返回下一个 AudioSource；PlayOneShot 下无需检查 isPlaying
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private AudioSource NextSFXSource()
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=> _sfxSources[_sfxRoundRobin++ % _sfxSources.Length];
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// 快照切换
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public void TransitionToSnapshot(string snapshotName, float transitionTime = 0.5f);
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private IEnumerator CrossfadeCoroutine(AudioClip newClip, float fadeOutDur, float fadeInDur);
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private static float LinearToDecibel(float linear)
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=> linear > 0.0001f ? 20f * Mathf.Log10(linear) : -80f;
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}
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```
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---
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## 3. BGMController
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```csharp
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// 路径: Assets/Scripts/Audio/BGMController.cs
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// 订阅世界 / Boss 事件，指挥 AudioManager 切换 BGM
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public class BGMController : MonoBehaviour
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{
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[SerializeField] private AudioManager _audioManager;
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[SerializeField] private AudioConfigSO _config;
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[Header("Event Channels - Subscribe")]
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[SerializeField] private GameStateEventChannelSO _onGameStateChanged;
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[SerializeField] private BoolEventChannelSO _onBossFightToggled; // true=开始, false=结束
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[SerializeField] private StringEventChannelSO _onRegionEntered; // region id
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private MusicState _musicState = MusicState.Exploration;
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private string _currentRegion = "Forest";
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private void OnEnable()
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{
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_onBossFightToggled.OnEventRaised += OnBossFightToggled;
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_onRegionEntered.OnEventRaised += OnRegionEntered;
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_onGameStateChanged.OnEventRaised += HandleStateChanged;
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}
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private void OnDisable() { /* -= */ }
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private void OnBossFightToggled(bool started)
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{
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if (started)
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{
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_musicState = MusicState.Boss;
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var clip = _config.GetBossBGM(_currentRegion);
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_audioManager.PlayBGM(clip, fadeOutDur: 1f, fadeInDur: 0.5f);
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_audioManager.TransitionToSnapshot("BossFight", 0.5f);
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}
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else
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{
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StartCoroutine(PlayVictoryThenRestore());
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}
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}
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private IEnumerator PlayVictoryThenRestore()
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{
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_musicState = MusicState.Victory;
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_audioManager.PlayBGM(_config.VictoryStingBGM, fadeOutDur: 0.3f, fadeInDur: 0.1f);
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yield return new WaitForSecondsRealtime(_config.VictoryStingDuration);
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_musicState = MusicState.Exploration;
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OnRegionEntered(_currentRegion);
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_audioManager.TransitionToSnapshot("Default", 1.0f);
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}
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private void OnRegionEntered(string regionId)
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{
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if (regionId == _currentRegion) return;
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_currentRegion = regionId;
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if (_musicState == MusicState.Exploration)
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{
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var clip = _config.GetZoneBGM(regionId);
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_audioManager.PlayBGM(clip, fadeOutDur: 1f, fadeInDur: 1f);
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}
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}
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private void HandleStateChanged(GameStateId state)
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{
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// ⚠️ GameStateId 是 struct，不能用 switch；使用 if/else + GameStates 常量（架构 03_CoreModule §2）
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if (state == GameStates.MainMenu)
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_audioManager.PlayBGM(_config.MainMenuBGM, fadeOutDur: 0.5f, fadeInDur: 1.0f);
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else if (state == GameStates.Paused)
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_audioManager.TransitionToSnapshot("Paused", 0.2f);
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else if (state == GameStates.Dead)
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_audioManager.TransitionToSnapshot("Dead", 1.5f);
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else if (state == GameStates.Gameplay)
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_audioManager.TransitionToSnapshot("Default", 0.3f);
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}
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}
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```
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---
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## 3.5 MusicState 音乐状态机
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```csharp
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// 路径: Assets/Scripts/Audio/BGMController.cs
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// 由 BGMController 内部维护，控制 BGM 切换逻辑
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public enum MusicState
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{
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Exploration, // 默认：区域探索 BGM
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Boss, // Boss 战：Boss 主题 BGM
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Victory, // Boss 击败后短暂胜利音乐
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None, // 过场/死亡/主菜单时由 BGMController 直接切换
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}
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```
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**状态转换**：
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```
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Exploration ──[开始 Boss 战]─────────────► Boss
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◄─[结束 Boss 战]──────────────
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Boss ──[Boss 击败]────────────────► Victory
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Victory ──[VictorySting 播放完毕]─────► Exploration
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Exploration ──[OnRegionEntered]─────────► Exploration（切换同状态内不同曲目）
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```
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---
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## 4. AudioZone
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```csharp
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// 路径: Assets/Scripts/Audio/AudioZone.cs
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// 触发器：进入区域时切换 BGM
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[RequireComponent(typeof(Collider2D))]
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public class AudioZone : MonoBehaviour
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{
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[SerializeField] private string _zoneId; // 与 AudioConfigSO 中的 key 对应
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[Header("Event Channel")]
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[SerializeField] private StringEventChannelSO _onRegionEntered;
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private void OnTriggerEnter2D(Collider2D other)
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{
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if (other.CompareTag("Player"))
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_onRegionEntered.Raise(_zoneId);
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}
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}
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```
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---
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## 5. AudioEventSO
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```csharp
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// 路径: Assets/Scripts/Audio/AudioEventSO.cs
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// 可在 Inspector 配置的 SFX 数据：支持随机音量/音调、随机片段
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[CreateAssetMenu(menuName = "Audio/AudioEvent")]
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public class AudioEventSO : ScriptableObject
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{
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public AudioClip[] Clips; // 随机挑选一个播放
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[Range(0f, 1f)]
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public float VolumeMin = 0.9f;
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[Range(0f, 1f)]
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public float VolumeMax = 1.0f;
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[Range(0.5f, 2f)]
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public float PitchMin = 0.95f;
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[Range(0.5f, 2f)]
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public float PitchMax = 1.05f;
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public AudioMixerGroup MixerGroup; // 指定路由到哪个子混音组（如 SFX_Player）
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public void Play(AudioSource source)
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{
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if (Clips == null || Clips.Length == 0) return;
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source.outputAudioMixerGroup = MixerGroup;
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source.clip = Clips[Random.Range(0, Clips.Length)];
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source.volume = Random.Range(VolumeMin, VolumeMax);
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source.pitch = Random.Range(PitchMin, PitchMax);
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source.Play();
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}
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public void PlayOneShot(AudioSource source)
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{
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if (Clips == null || Clips.Length == 0) return;
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var clip = Clips[Random.Range(0, Clips.Length)];
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source.outputAudioMixerGroup = MixerGroup;
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source.PlayOneShot(clip, Random.Range(VolumeMin, VolumeMax));
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}
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}
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```
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**资产路径**：`Assets/ScriptableObjects/Audio/`
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**命名规范**：`AUD_{Category}_{Name}.asset`（例 `AUD_Player_SwordSlash.asset`）
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---
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## 6. GlobalSFXPlayer
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```csharp
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// 路径: Assets/Scripts/Audio/GlobalSFXPlayer.cs
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// 提供静态方法入口，配合 AudioEventSO 在任何地方播放 SFX
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// Feel（MMF_Player）的 MMSoundManagerSoundSO 也通过此路由
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public class GlobalSFXPlayer : MonoBehaviour
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{
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private static GlobalSFXPlayer _instance;
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[SerializeField] private AudioMixerGroup _sfxGroup;
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private void Awake()
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{
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if (_instance != null) { Destroy(gameObject); return; }
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_instance = this;
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}
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// 路由到 AudioManager.PlaySFX（多源轮转池，见 §2）
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// AudioEventSO.GetClip() 返回对应音频片段（含随机变体支持）
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public static void Play(AudioEventSO audioEvent, Vector2? worldPos = null)
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{
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// 2D 游戏不需要 3D 空间音效衰减；统一委托 AudioManager 多源池播放
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var clip = audioEvent.GetClip();
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if (clip != null)
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AudioManager.Instance.PlaySFX(clip);
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}
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}
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```
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---
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## 7. AudioConfigSO
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```csharp
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// 路径: Assets/Scripts/Audio/AudioConfigSO.cs
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[CreateAssetMenu(menuName = "Audio/AudioConfig")]
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public class AudioConfigSO : ScriptableObject
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{
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[System.Serializable]
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public struct ZoneBGMEntry
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{
|
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public string ZoneId;
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public AudioClip BGMClip;
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public float FadeDuration;
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}
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||||
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[System.Serializable]
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public struct BossBGMEntry
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{
|
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public string BossId;
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public AudioClip BGMClip;
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||||
}
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||||
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public ZoneBGMEntry[] ZoneBGMs;
|
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public BossBGMEntry[] BossBGMs;
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public AudioClip MainMenuBGM;
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public AudioClip GameOverSting; // 死亡时短音乐片段
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public AudioClip VictoryStingBGM; // Boss 击败后胜利音乐片段
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public float VictoryStingDuration = 4f; // 胜利音乐播放时长（秒）
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public AudioClip GetZoneBGM(string zoneId)
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{
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foreach (var e in ZoneBGMs)
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if (e.ZoneId == zoneId) return e.BGMClip;
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return null;
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}
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public AudioClip GetBossBGM(string bossId)
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{
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foreach (var e in BossBGMs)
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if (e.BossId == bossId) return e.BGMClip;
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return null;
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||||
}
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||||
}
|
||||
```
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||||
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||||
**资产路径**：`Assets/ScriptableObjects/Audio/AUD_Config.asset`
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||||
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||||
---
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||||
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||||
## 8. 音频事件频道清单
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||||
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||||
| 资产名 | 类型 | Raise 方 | Subscribe 方 |
|
||||
|--------|------|---------|-------------|
|
||||
| `EVT_RegionEntered` | `StringEventChannelSO` | `AudioZone` | `BGMController` |
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||||
| `EVT_BossFightStarted` | `StringEventChannelSO` | `BossOrchestrator` | `BGMController`、`BossHPBar` |
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||||
| `EVT_BossFightEnded` | `BoolEventChannelSO` | `BossBase` | `BGMController` |
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||||
| `EVT_GameStateChanged` | `GameStateEventChannelSO` | `GameManager` | `BGMController`（暂停/恢复）、`AudioManager`（快照） |
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||||
| `EVT_PlayerDied` | `VoidEventChannelSO` | `PlayerStats` | `AudioManager`（播放 GameOverSting、切 Dead 快照） |
|
||||
|
||||
---
|
||||
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||||
## 9. 脚步声材质分层（Footstep Material System）
|
||||
|
||||
> **Design 来源**：[12_AudioSystem](../Design/12_AudioSystem.md) §14
|
||||
|
||||
脚步声根据脚下地面材质动态切换，不使用单一 SFX 以增强环境真实感。
|
||||
|
||||
```csharp
|
||||
// 路径: Assets/Scripts/Audio/FootstepMaterial.cs
|
||||
public enum FootstepMaterial
|
||||
{
|
||||
Stone, // 石板地（默认）
|
||||
Dirt, // 泥土/草地
|
||||
Wood, // 木板
|
||||
Metal, // 金属格栅
|
||||
Water, // 浅水区（溅水声）
|
||||
Sand, // 沙地
|
||||
Grass, // 草丛
|
||||
Cave, // 洞穴（回响加强）
|
||||
}
|
||||
|
||||
// 路径: Assets/Scripts/Audio/FootstepAudioConfigSO.cs
|
||||
[CreateAssetMenu(menuName = "BaseGames/Audio/FootstepAudioConfig")]
|
||||
public class FootstepAudioConfigSO : ScriptableObject
|
||||
{
|
||||
[System.Serializable]
|
||||
public struct MaterialEntry
|
||||
{
|
||||
public FootstepMaterial material;
|
||||
public AudioClip[] clips; // 随机选一个，防止重复感
|
||||
[Range(0f, 1f)] public float volume;
|
||||
[Range(0.8f, 1.2f)] public float pitchVariance; // 每次随机 pitch 偏移范围
|
||||
}
|
||||
|
||||
public MaterialEntry[] entries;
|
||||
|
||||
public MaterialEntry? GetEntry(FootstepMaterial mat)
|
||||
{
|
||||
foreach (var e in entries)
|
||||
if (e.material == mat) return e;
|
||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
// 路径: Assets/Scripts/Audio/FootstepMaterialMarker.cs
|
||||
// 挂载到地面碰撞体所在 GameObject（Tilemap 图层 or 单体地形 Prefab）
|
||||
public class FootstepMaterialMarker : MonoBehaviour
|
||||
{
|
||||
public FootstepMaterial material;
|
||||
}
|
||||
```
|
||||
|
||||
**播放时机**：
|
||||
- **落地**：`PlayerController.OnLanded()` 触发（同 MaterialEntry，音量 ×1.5）
|
||||
- **行走**：Animancer 动画事件 `FootstepL` / `FootstepR`（见 `24_AnimEventModule`）触发
|
||||
- **冲刺起步**：Dash 动画第 2 帧触发专属 `DashSFX`（不走 Footstep 通道）
|
||||
|
||||
玩家若脚下 GameObject 无 `FootstepMaterialMarker`，默认使用 `Stone`。
|
||||
|
||||
---
|
||||
|
||||
## 10. 水下音效处理（Underwater Audio）
|
||||
|
||||
> **Design 来源**：[12_AudioSystem](../Design/12_AudioSystem.md) §15
|
||||
|
||||
进入 `LiquidZone`（见 `21_LiquidPuzzleModule`）时，全局音效自动应用水下 DSP 处理。
|
||||
|
||||
```csharp
|
||||
// 路径: Assets/Scripts/Audio/UnderwaterAudioController.cs
|
||||
// 挂载于 PlayerController 所在 GameObject；LiquidZone 调用 EnterWater/ExitWater
|
||||
public class UnderwaterAudioController : MonoBehaviour
|
||||
{
|
||||
[SerializeField] AudioMixer _mixer;
|
||||
[SerializeField] float _transitionDuration = 0.3f;
|
||||
|
||||
/// <summary>LiquidZone.OnTriggerEnter2D 时调用</summary>
|
||||
public void EnterWater()
|
||||
{
|
||||
_mixer.FindSnapshot("Underwater")
|
||||
.TransitionTo(_transitionDuration);
|
||||
}
|
||||
|
||||
/// <summary>LiquidZone.OnTriggerExit2D 时调用</summary>
|
||||
public void ExitWater()
|
||||
{
|
||||
_mixer.FindSnapshot("Default")
|
||||
.TransitionTo(_transitionDuration);
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
**Underwater Snapshot DSP 配置**（AudioMixer 中预设）：
|
||||
|
||||
| Bus | 处理 |
|
||||
|-----|------|
|
||||
| BGM | Low-Pass 800 Hz（水下声音沉闷）|
|
||||
| SFX | Low-Pass 1200 Hz + Volume ×0.7 |
|
||||
| Ambient | Volume ×0，替换为水下环境音（气泡声）|
|
||||
| PlayerSFX | Low-Pass 1000 Hz |
|
||||
|
||||
**水下专属 SFX 对照**：
|
||||
|
||||
| 动作 | 水上 SFX | 水下 SFX |
|
||||
|------|---------|---------|
|
||||
| 攻击 | `sfx_player_slash` | `sfx_player_slash_underwater` |
|
||||
| 浮出水面 | — | `sfx_splash_exit` |
|
||||
| 入水 | — | `sfx_splash_enter` |
|
||||
| 游泳移动 | — | `sfx_swim_loop`（循环，pitch 随速度变化）|
|
||||
Reference in New Issue
Block a user