dial m for... mute/unmute

life/src/main.rs

@@ -65,6 +65,7 @@ fn main() {
                 // Run if any component added/removed: AudioSink
                 // Run if state changed: AudioPlayback
                 control_volume,
+                toggle_audio_state.run_if(input_just_pressed(KeyCode::KeyM)),
                 de_spawn_cells
                     .run_if(not(is_ui_hovered))
                     .run_if(not(is_panning))
@@ -981,6 +982,21 @@ fn load_audio_tones(mut pitches: ResMut<Assets<Pitch>>, mut cell_assets: ResMut<
     debug_assert_eq!(cell_assets.pitches.iter().len(), 132);
 }
 
+// When volume is toggled on/off make the following updates:
+// * AudioPlayback state is flipped
+fn toggle_audio_state(
+    mut next_state: ResMut<NextState<AudioPlayback>>,
+    curr_state: Res<State<AudioPlayback>>,
+) {
+    // Set next audio playback state
+    next_state.set(
+        match curr_state.get() {
+            AudioPlayback::Play => AudioPlayback::Mute,
+            AudioPlayback::Mute => AudioPlayback::Play,
+        }
+    );
+}
+
 fn control_volume(
     audio_state: Res<State<AudioPlayback>>,
     simulation_state: Res<State<SimulationPlayback>>,