Add music and voice assets

src/game/audio/SoundDirector.ts

@@ -1,42 +1,82 @@
+type AudioTrackMap = Record<string, string>;
+export type VoiceRole = 'narrator' | 'liuBei' | 'guanYu' | 'zhangFei';
+
+type PitchSafeAudio = HTMLAudioElement & {
+  preservesPitch?: boolean;
+  mozPreservesPitch?: boolean;
+  webkitPreservesPitch?: boolean;
+};
+
+const rolePlayback: Record<VoiceRole, { rate: number; volume: number }> = {
+  narrator: { rate: 0.98, volume: 0.9 },
+  liuBei: { rate: 0.96, volume: 0.92 },
+  guanYu: { rate: 0.84, volume: 0.95 },
+  zhangFei: { rate: 1.05, volume: 1 }
+};
+
 class SoundDirector {
   private context?: AudioContext;
   private master?: GainNode;
-  private musicGain?: GainNode;
   private started = false;
   private muted = false;
-  private sequenceTimer?: number;
+  private musicTracks: AudioTrackMap = {};
+  private voiceTracks: AudioTrackMap = {};
+  private music?: HTMLAudioElement;
+  private voice?: HTMLAudioElement;
+  private currentMusicKey?: string;
+  private pendingMusicKey?: string;
+  private musicFadeTimer?: number;
+  private musicRampTimer?: number;
+  private readonly musicVolume = 0.46;
+  private readonly duckedMusicVolume = 0.18;
+
+  registerMusicTracks(tracks: AudioTrackMap) {
+    this.musicTracks = tracks;
+  }
+
+  registerVoiceTracks(tracks: AudioTrackMap) {
+    this.voiceTracks = tracks;
+  }
 
   start() {
     if (this.started) {
+      this.resume();
+      if (this.pendingMusicKey) {
+        this.playMusic(this.pendingMusicKey);
+      }
       return;
     }
 
     const AudioContextCtor = window.AudioContext ?? window.webkitAudioContext;
-    if (!AudioContextCtor) {
-      return;
+    if (AudioContextCtor) {
+      this.context = new AudioContextCtor();
+      this.master = this.context.createGain();
+      this.master.gain.value = this.muted ? 0 : 0.34;
+      this.master.connect(this.context.destination);
     }
 
-    this.context = new AudioContextCtor();
-    this.master = this.context.createGain();
-    this.master.gain.value = this.muted ? 0 : 0.34;
-    this.master.connect(this.context.destination);
-
-    this.musicGain = this.context.createGain();
-    this.musicGain.gain.value = 0.0;
-    this.musicGain.connect(this.master);
     this.started = true;
-
-    this.createAmbientBed();
-    this.schedulePlucks();
-    this.musicGain.gain.linearRampToValueAtTime(0.72, this.context.currentTime + 2.4);
+    this.resume();
+    if (this.pendingMusicKey) {
+      this.playMusic(this.pendingMusicKey);
+    }
   }
 
   resume() {
     void this.context?.resume();
+    if (this.started && this.music) {
+      void this.music.play().catch(() => undefined);
+    }
   }
 
   setMuted(muted: boolean) {
     this.muted = muted;
+    if (this.music) {
+      this.music.muted = muted;
+    }
+    if (this.voice) {
+      this.voice.muted = muted;
+    }
 
     if (!this.context || !this.master) {
       return;
@@ -59,60 +99,110 @@ class SoundDirector {
     window.setTimeout(() => this.playTone(495, 0.1, 0.08, 'triangle'), 65);
   }
 
-  private createAmbientBed() {
-    if (!this.context || !this.musicGain) {
+  playMusic(key?: string) {
+    if (!key) {
       return;
     }
 
-    const base = this.context.createOscillator();
-    const fifth = this.context.createOscillator();
-    const filter = this.context.createBiquadFilter();
-    const bedGain = this.context.createGain();
+    this.pendingMusicKey = key;
+    if (!this.started) {
+      return;
+    }
 
-    base.type = 'sine';
-    fifth.type = 'sine';
-    base.frequency.value = 110;
-    fifth.frequency.value = 165;
-    filter.type = 'lowpass';
-    filter.frequency.value = 520;
-    bedGain.gain.value = 0.08;
+    const src = this.musicTracks[key];
+    if (!src) {
+      return;
+    }
 
-    base.connect(filter);
-    fifth.connect(filter);
-    filter.connect(bedGain);
-    bedGain.connect(this.musicGain);
-    base.start();
-    fifth.start();
+    if (this.currentMusicKey === key && this.music) {
+      this.music.muted = this.muted;
+      void this.music.play().catch(() => undefined);
+      return;
+    }
+
+    const previous = this.music;
+    const next = new Audio(src);
+    next.loop = true;
+    next.preload = 'auto';
+    next.muted = this.muted;
+    next.volume = 0;
+
+    this.music = next;
+    this.currentMusicKey = key;
+    void next.play().catch(() => undefined);
+    this.fadeMusic(previous, next, this.voice ? this.duckedMusicVolume : this.musicVolume);
   }
 
-  private schedulePlucks() {
-    if (!this.context) {
+  playVoice(key?: string, role: VoiceRole = 'narrator') {
+    if (!key || !this.started) {
+      this.stopVoice();
+      return;
+    }
+    this.stopVoice(false);
+
+    const src = this.voiceTracks[key];
+    if (!src) {
       return;
     }
 
-    const notes = [220, 247, 294, 330, 392, 330, 294, 247];
-    let index = 0;
-    this.sequenceTimer = window.setInterval(() => {
-      this.playTone(notes[index % notes.length], 0.18, 0.09, 'triangle', true);
-      index += 1;
-    }, 1800);
+    const profile = rolePlayback[role] ?? rolePlayback.narrator;
+    const voice = new Audio(src) as PitchSafeAudio;
+    voice.preload = 'auto';
+    voice.muted = this.muted;
+    voice.volume = profile.volume;
+    voice.playbackRate = profile.rate;
+    voice.preservesPitch = false;
+    voice.mozPreservesPitch = false;
+    voice.webkitPreservesPitch = false;
+    voice.addEventListener('ended', () => {
+      if (this.voice === voice) {
+        this.voice = undefined;
+        this.duckMusic(false);
+      }
+    });
+    voice.addEventListener('error', () => {
+      if (this.voice === voice) {
+        this.voice = undefined;
+        this.duckMusic(false);
+      }
+    });
+
+    this.voice = voice;
+    this.duckMusic(true);
+    void voice.play().catch(() => {
+      if (this.voice === voice) {
+        this.voice = undefined;
+        this.duckMusic(false);
+      }
+    });
+  }
+
+  stopVoice(restoreMusic = true) {
+    if (!this.voice) {
+      return;
+    }
+
+    this.voice.pause();
+    this.voice.currentTime = 0;
+    this.voice = undefined;
+    if (restoreMusic) {
+      this.duckMusic(false);
+    }
   }
 
   private playTone(
     frequency: number,
     duration: number,
     gainValue: number,
-    type: OscillatorType,
-    routeToMusic = false
+    type: OscillatorType
   ) {
-    if (!this.context) {
+    if (!this.context || this.muted) {
       return;
     }
 
     const oscillator = this.context.createOscillator();
     const gain = this.context.createGain();
     const now = this.context.currentTime;
-    const destination = routeToMusic && this.musicGain ? this.musicGain : this.master;
 
     oscillator.type = type;
     oscillator.frequency.value = frequency;
@@ -121,10 +211,73 @@ class SoundDirector {
     gain.gain.exponentialRampToValueAtTime(0.0001, now + duration);
 
     oscillator.connect(gain);
-    gain.connect(destination ?? this.context.destination);
+    gain.connect(this.master ?? this.context.destination);
     oscillator.start(now);
     oscillator.stop(now + duration + 0.04);
   }
+
+  private fadeMusic(previous: HTMLAudioElement | undefined, next: HTMLAudioElement, targetVolume: number) {
+    if (this.musicFadeTimer) {
+      window.clearInterval(this.musicFadeTimer);
+    }
+
+    const duration = 900;
+    const startedAt = performance.now();
+    const previousStartVolume = previous?.volume ?? 0;
+
+    this.musicFadeTimer = window.setInterval(() => {
+      const progress = Math.min(1, (performance.now() - startedAt) / duration);
+      next.volume = targetVolume * progress;
+
+      if (previous) {
+        previous.volume = previousStartVolume * (1 - progress);
+      }
+
+      if (progress >= 1) {
+        if (this.musicFadeTimer) {
+          window.clearInterval(this.musicFadeTimer);
+          this.musicFadeTimer = undefined;
+        }
+        if (previous) {
+          previous.pause();
+          previous.src = '';
+        }
+      }
+    }, 32);
+  }
+
+  private duckMusic(ducked: boolean) {
+    if (!this.music) {
+      return;
+    }
+
+    if (ducked && this.musicFadeTimer) {
+      window.clearInterval(this.musicFadeTimer);
+      this.musicFadeTimer = undefined;
+    }
+
+    if (this.musicRampTimer) {
+      window.clearInterval(this.musicRampTimer);
+    }
+
+    const from = this.music.volume;
+    const to = ducked ? this.duckedMusicVolume : this.musicVolume;
+    const duration = 260;
+    const startedAt = performance.now();
+
+    this.musicRampTimer = window.setInterval(() => {
+      if (!this.music) {
+        return;
+      }
+
+      const progress = Math.min(1, (performance.now() - startedAt) / duration);
+      this.music.volume = from + (to - from) * progress;
+      if (progress >= 1 && this.musicRampTimer) {
+        window.clearInterval(this.musicRampTimer);
+        this.musicRampTimer = undefined;
+      }
+    }, 32);
+  }
 }
 
 declare global {

src/game/audio/audioAssets.ts

@@ -0,0 +1,39 @@
+import battlePrepUrl from '../../assets/audio/bgm/battle-prep.wav';
+import militiaThemeUrl from '../../assets/audio/bgm/militia-theme.wav';
+import oathThemeUrl from '../../assets/audio/bgm/oath-theme.wav';
+import storyDarkUrl from '../../assets/audio/bgm/story-dark.wav';
+import titleThemeUrl from '../../assets/audio/bgm/title-theme.wav';
+import battleBriefingVoiceUrl from '../../assets/audio/voice/prologue/battle-briefing.wav';
+import firstSortieVoiceUrl from '../../assets/audio/voice/prologue/first-sortie.wav';
+import guanYuJoinsVoiceUrl from '../../assets/audio/voice/prologue/guan-yu-joins.wav';
+import liuBeiResolveVoiceUrl from '../../assets/audio/voice/prologue/liu-bei-resolve.wav';
+import militiaRisesVoiceUrl from '../../assets/audio/voice/prologue/militia-rises.wav';
+import oathBrothersVoiceUrl from '../../assets/audio/voice/prologue/oath-brothers.wav';
+import oathLiuBeiVoiceUrl from '../../assets/audio/voice/prologue/oath-liu-bei.wav';
+import oathNarrationVoiceUrl from '../../assets/audio/voice/prologue/oath-narration.wav';
+import yellowTurbanChaosVoiceUrl from '../../assets/audio/voice/prologue/yellow-turban-chaos.wav';
+import zhangFeiJoinsVoiceUrl from '../../assets/audio/voice/prologue/zhang-fei-joins.wav';
+
+export const musicTracks = {
+  'title-theme': titleThemeUrl,
+  'story-dark': storyDarkUrl,
+  'oath-theme': oathThemeUrl,
+  'militia-theme': militiaThemeUrl,
+  'battle-prep': battlePrepUrl
+} as const;
+
+export const voiceTracks = {
+  'yellow-turban-chaos': yellowTurbanChaosVoiceUrl,
+  'liu-bei-resolve': liuBeiResolveVoiceUrl,
+  'zhang-fei-joins': zhangFeiJoinsVoiceUrl,
+  'guan-yu-joins': guanYuJoinsVoiceUrl,
+  'oath-narration': oathNarrationVoiceUrl,
+  'oath-liu-bei': oathLiuBeiVoiceUrl,
+  'oath-brothers': oathBrothersVoiceUrl,
+  'militia-rises': militiaRisesVoiceUrl,
+  'first-sortie': firstSortieVoiceUrl,
+  'battle-briefing': battleBriefingVoiceUrl
+} as const;
+
+export type MusicTrackKey = keyof typeof musicTracks;
+export type VoiceTrackKey = keyof typeof voiceTracks;

src/game/data/scenario.ts

@@ -1,4 +1,5 @@
 export type PortraitKey = 'liuBei' | 'guanYu' | 'zhangFei';
+export type VoiceRole = 'narrator' | PortraitKey;
 
 export type StoryPage = {
   id: string;
@@ -6,6 +7,9 @@ export type StoryPage = {
   background: string;
   speaker?: string;
   portrait?: PortraitKey;
+  bgm?: string;
+  voice?: string;
+  voiceRole?: VoiceRole;
   text: string;
 };
 
@@ -33,12 +37,18 @@ export type BattleMap = {
 export const prologuePages: StoryPage[] = [
   {
     id: 'yellow-turban-chaos',
+    bgm: 'story-dark',
+    voice: 'yellow-turban-chaos',
+    voiceRole: 'narrator',
     chapter: '난세의 시작',
     background: 'story-chaos',
     text: '중평 원년, 황건의 깃발이 각지에서 일어났다. 관군은 흩어지고, 마을마다 피난 행렬이 이어졌다.'
   },
   {
     id: 'liu-bei-resolve',
+    bgm: 'story-dark',
+    voice: 'liu-bei-resolve',
+    voiceRole: 'liuBei',
     chapter: '탁현의 방',
     background: 'story-liu-bei',
     speaker: '유비',
@@ -47,6 +57,9 @@ export const prologuePages: StoryPage[] = [
   },
   {
     id: 'zhang-fei-joins',
+    bgm: 'story-dark',
+    voice: 'zhang-fei-joins',
+    voiceRole: 'zhangFei',
     chapter: '뜻이 모이다',
     background: 'story-three-heroes',
     speaker: '장비',
@@ -55,6 +68,9 @@ export const prologuePages: StoryPage[] = [
   },
   {
     id: 'guan-yu-joins',
+    bgm: 'story-dark',
+    voice: 'guan-yu-joins',
+    voiceRole: 'guanYu',
     chapter: '뜻이 모이다',
     background: 'story-three-heroes',
     speaker: '관우',
@@ -63,12 +79,18 @@ export const prologuePages: StoryPage[] = [
   },
   {
     id: 'oath-narration',
+    bgm: 'oath-theme',
+    voice: 'oath-narration',
+    voiceRole: 'narrator',
     chapter: '도원결의',
     background: 'title-taoyuan',
     text: '복숭아꽃이 흩날리는 동산에서 세 사람은 하늘과 땅에 고했다.'
   },
   {
     id: 'oath-liu-bei',
+    bgm: 'oath-theme',
+    voice: 'oath-liu-bei',
+    voiceRole: 'liuBei',
     chapter: '도원결의',
     background: 'title-taoyuan',
     speaker: '유비',
@@ -77,6 +99,9 @@ export const prologuePages: StoryPage[] = [
   },
   {
     id: 'oath-brothers',
+    bgm: 'oath-theme',
+    voice: 'oath-brothers',
+    voiceRole: 'guanYu',
     chapter: '도원결의',
     background: 'title-taoyuan',
     speaker: '관우',
@@ -85,6 +110,9 @@ export const prologuePages: StoryPage[] = [
   },
   {
     id: 'militia-rises',
+    bgm: 'militia-theme',
+    voice: 'militia-rises',
+    voiceRole: 'zhangFei',
     chapter: '의용군 모집',
     background: 'story-militia',
     speaker: '장비',
@@ -93,6 +121,9 @@ export const prologuePages: StoryPage[] = [
   },
   {
     id: 'first-sortie',
+    bgm: 'battle-prep',
+    voice: 'first-sortie',
+    voiceRole: 'liuBei',
     chapter: '첫 출진',
     background: 'story-sortie',
     speaker: '유비',
@@ -101,6 +132,9 @@ export const prologuePages: StoryPage[] = [
   },
   {
     id: 'battle-briefing',
+    bgm: 'battle-prep',
+    voice: 'battle-briefing',
+    voiceRole: 'narrator',
     chapter: '황건적 토벌',
     background: 'story-sortie',
     text: '의용군은 마을 어귀로 향했다. 첫 싸움은 곧 시작된다.'

src/game/scenes/BattleScene.ts

@@ -1,4 +1,5 @@
 import Phaser from 'phaser';
+import { soundDirector } from '../audio/SoundDirector';
 import { firstBattleMap, firstBattleUnits, type TerrainType, type UnitData } from '../data/scenario';
 import { palette } from '../ui/palette';
 
@@ -24,6 +25,8 @@ export class BattleScene extends Phaser.Scene {
 
   create() {
     const { width, height } = this.scale;
+    soundDirector.stopVoice();
+    soundDirector.playMusic('battle-prep');
     this.add.rectangle(0, 0, width, height, 0x0f1418).setOrigin(0);
     this.drawMap();
     this.drawUnits();

src/game/scenes/StoryScene.ts

@@ -1,4 +1,5 @@
 import Phaser from 'phaser';
+import { soundDirector } from '../audio/SoundDirector';
 import { prologuePages, type PortraitKey, type StoryPage } from '../data/scenario';
 import { palette } from '../ui/palette';
 
@@ -114,6 +115,8 @@ export class StoryScene extends Phaser.Scene {
   }
 
   private applyPage(page: StoryPage) {
+    soundDirector.playMusic(page.bgm);
+    soundDirector.playVoice(page.voice, page.voiceRole ?? page.portrait ?? 'narrator');
     this.applyBackground(page.background);
     this.chapterText?.setText(page.chapter);
 

src/game/scenes/TitleScene.ts

@@ -17,8 +17,15 @@ export class TitleScene extends Phaser.Scene {
     this.drawTitleMark(width, height);
     this.drawMenu(width, height);
 
-    this.input.once('pointerdown', () => soundDirector.start());
-    this.input.keyboard?.once('keydown', () => soundDirector.start());
+    soundDirector.playMusic('title-theme');
+    const unlockAudio = () => {
+      soundDirector.start();
+      soundDirector.resume();
+      soundDirector.playMusic('title-theme');
+    };
+
+    this.input.once('pointerdown', unlockAudio);
+    this.input.keyboard?.once('keydown', unlockAudio);
     this.input.keyboard?.once('keydown-ENTER', () => this.startGame());
   }
 
@@ -275,6 +282,8 @@ export class TitleScene extends Phaser.Scene {
   }
 
   private startGame() {
+    soundDirector.start();
+    soundDirector.resume();
     soundDirector.playSelect();
     this.scene.start('StoryScene');
   }