wade method

void wade(AudioScene scene, Iterable<Wader> waders, double dt)

This frame's waders heard on scene, dt seconds after the last: a splash as each goes into water at WadingHearing.splashFrom or faster, as loud as it goes, and not again for WadingHearing.hushSeconds; a wash (ElementCues.wash) held to each in water at WadingHearing.washFrom or faster, louder and faster the faster it goes; a wader not given this frame is let go.

What racing played of its cars through a ford, folded in here: the game says where its bodies are and whether they are in water, and this hears them.

Implementation

void wade(AudioScene scene, Iterable<Wader> waders, double dt) {
  final hearing = cues.wading;
  final washing = <Held>[];
  final seen = <int>{};
  for (final w in waders) {
    seen.add(w.key);
    final was = _waders[w.key];
    var hush = math.max(0.0, (was?.hush ?? 0.0) - dt);
    final goesIn = w.wet && !(was?.wet ?? false);
    if (goesIn && w.speed > hearing.splashFrom && hush <= 0.0) {
      hush = hearing.hushSeconds;
      scene.play(cues.splash, w.at, bus: bus).gain = (w.speed / hearing.loud)
          .clamp(0.3, 1.0);
    }
    _waders[w.key] = _WaderHeard(wet: w.wet, hush: hush);
    if (w.wet && w.speed > hearing.washFrom) {
      washing.add(
        Held(
          key: w.key,
          at: Vector3.copy(w.at),
          gain: (w.speed / hearing.washLoud).clamp(0.2, 1.0),
          rate: 0.9 + 0.3 * (w.speed / hearing.washFast).clamp(0.0, 1.0),
        ),
      );
    }
  }
  _waders.removeWhere((key, _) => !seen.contains(key));
  _washes.hold(scene, washing);
}