Add directional emit model and per-type emit range defaults

client/src/audio/radioStationRuntime.ts

@@ -113,12 +113,21 @@ function freshStreamUrl(streamUrl: string): string {
   return `${streamUrl}${separator}chgrid_start=${Date.now()}`;
 }
 
+type RadioSpatialConfig = {
+  range: number;
+  directional: boolean;
+  facingDeg: number;
+};
+
 export class RadioStationRuntime {
   private readonly sharedRadioSources = new Map<string, SharedRadioSource>();
   private readonly itemRadioOutputs = new Map<string, ItemRadioOutput>();
   private layerEnabled = true;
 
-  constructor(private readonly audio: AudioEngine) {}
+  constructor(
+    private readonly audio: AudioEngine,
+    private readonly getSpatialConfig: (item: WorldItem) => RadioSpatialConfig,
+  ) {}
 
   cleanup(itemId: string): void {
     const output = this.itemRadioOutputs.get(itemId);
@@ -203,14 +212,21 @@ export class RadioStationRuntime {
         output.gain.gain.linearRampToValueAtTime(0, audioCtx.currentTime + 0.05);
         continue;
       }
+      const spatialConfig = this.getSpatialConfig(item);
       const mix = resolveSpatialMix({
         dx: item.x - playerPosition.x,
         dy: item.y - playerPosition.y,
-        range: HEARING_RADIUS,
+        range: Math.max(1, spatialConfig.range || HEARING_RADIUS),
         baseGain: normalizedVolume,
         nearFieldDistance: 1,
         nearFieldGain: 1,
         nearFieldCenterPan: true,
+        directional: {
+          enabled: spatialConfig.directional,
+          facingDeg: spatialConfig.facingDeg,
+          coneDeg: 120,
+          rearGain: 0.5,
+        },
       });
       const gainValue = mix?.gain ?? 0;
       const panValue = mix?.pan ?? 0;