mute audio with `m`

src/audio.rs

@@ -21,13 +21,17 @@ impl Plugin for AudioPlugin {
             ],
         });
 
+        app.init_resource::<AudioVolume>();
         app.add_systems(OnEnter(GameState::Menu), play_background);
         app.add_systems(
             Update,
             (
                 play_audio.run_if(any_component_added::<AudioSource>),
                 audio_trigger.run_if(on_event::<AudioEvent>()),
-                // play_background.run_if(on_event::<AssetEvent<AudioSettings>>()), TODO: Handle music hot-reload
+                control_volume.run_if(resource_changed::<AudioVolume>()),
+                toggle_volume.run_if(|keys: Res<Input<KeyCode>>| -> bool {
+                    keys.just_pressed(KeyCode::M)
+                }),
             ),
         );
     }
@@ -46,6 +50,15 @@ pub enum AudioEvent {
     Invalid,
 }
 
+#[derive(Resource, Debug)]
+pub struct AudioVolume(f32);
+
+impl Default for AudioVolume {
+    fn default() -> Self {
+        AudioVolume(1.0)
+    }
+}
+
 fn play_background(mut events: EventWriter<AudioEvent>) {
     events.send(AudioEvent::MainMusic);
 }
@@ -62,6 +75,7 @@ fn audio_trigger(
     server: Res<AssetServer>,
     tweaks: Res<Assets<tweak::Tweaks>>,
     display_state: Res<State<DisplayState>>,
+    vol: Res<AudioVolume>,
 ) {
     let tweak = tweaks
         .get(&server.load("martian.tweak.toml"))
@@ -85,7 +99,6 @@ fn audio_trigger(
         if !aud.is_empty() {
             let event_str = format!("event:{}", aud);
             if let Ok(event_description) = studio.0.get_event(event_str.as_str()) {
-                let audio_source = AudioSource::new(event_description);
                 // We are stopping a playing event
                 match event {
                     // Find and stop playing instances of idle audio
@@ -113,6 +126,8 @@ fn audio_trigger(
                     // we are playing a sound
                     _ => {
                         info!("Playing audio {}", event_str);
+                        let audio_source = AudioSource::new(event_description);
+                        audio_source.set_volume(vol.0);
                         // TODO: Can we batch spawn all sounds at startup? Then Start/Stop/Reset at runtime?
                         commands.spawn((audio_source, event.clone()));
                     }
@@ -123,3 +138,22 @@ fn audio_trigger(
         }
     });
 }
+
+fn toggle_volume(
+    mut vol: ResMut<AudioVolume>,
+) {
+    if vol.0 > 0.0 {
+        vol.0 = 0.0;
+    } else {
+        vol.0 = 1.0;
+    }
+}
+
+fn control_volume(
+    vol: Res<AudioVolume>,
+    query: Query<&AudioSource>,
+) {
+    query.iter().for_each(|aud_src| {
+        aud_src.set_volume((*vol).0)
+    });
+}