Add game source, converter pipeline, and web port

web/src/SoundManager.ts

@@ -0,0 +1,61 @@
+const audioCtx = new (window.AudioContext || (window as any).webkitAudioContext)();
+
+const sounds: Record<string, AudioBuffer> = {};
+
+async function loadSound(name: string): Promise<AudioBuffer> {
+  const response = await fetch(`./sounds/${name}.ogg`);
+  const arrayBuffer = await response.arrayBuffer();
+  return audioCtx.decodeAudioData(arrayBuffer);
+}
+
+export async function initSounds() {
+  const names = ['fireball', 'explosion', 'sword_hit1', 'teleport', 'damage', 'spiderwalking', 'spawn', 'gameover'];
+  for (const name of names) {
+    try {
+      sounds[name] = await loadSound(name);
+    } catch {
+      console.warn(`Sound ${name} not found`);
+    }
+  }
+}
+
+export function resumeContext() {
+  if (audioCtx.state === 'suspended') {
+    audioCtx.resume();
+  }
+}
+
+export function playSound(name: string, volume = 1) {
+  const buffer = sounds[name];
+  if (!buffer) return;
+  if (audioCtx.state === 'suspended') return;
+  const source = audioCtx.createBufferSource();
+  source.buffer = buffer;
+  const gain = audioCtx.createGain();
+  gain.gain.value = volume;
+  source.connect(gain);
+  gain.connect(audioCtx.destination);
+  source.start(0);
+}
+
+export function playLoopingSound(name: string, volume = 1): (() => void) | null {
+  const buffer = sounds[name];
+  if (!buffer) return null;
+  if (audioCtx.state === 'suspended') return null;
+  const source = audioCtx.createBufferSource();
+  source.buffer = buffer;
+  source.loop = true;
+  const gain = audioCtx.createGain();
+  gain.gain.value = volume;
+  source.connect(gain);
+  gain.connect(audioCtx.destination);
+  source.start(0);
+  return () => {
+    try {
+      source.stop();
+    } catch {
+      // already stopped
+    }
+    source.disconnect();
+  };
+}