prototypes/life: fix some audio jank, still janky just less

prototypes/src/bin/life.rs

@@ -2,7 +2,7 @@
 
 use std::time::Duration;
 
-use bevy::{picking::hover::Hovered, platform::collections::HashMap};
+use bevy::{audio::Volume, picking::hover::Hovered, platform::collections::HashMap};
 use engine::*;
 
 const TILE: &str = "tileGrey_01.png";
@@ -27,6 +27,7 @@ fn main() {
         .init_resource::<Coordinates>()
         .init_resource::<CellAssets>()
         .init_state::<SimulationState>()
+        .insert_resource(GlobalVolume::new(Volume::Linear(1.0)))
         .add_message::<Lifecycle>()
         .add_message::<SimulationState>()
         .add_systems(Startup, setup)
@@ -37,6 +38,10 @@ fn main() {
             Update,
             update_grid_position.run_if(on_message::<CursorMoved>),
         )
+        .add_systems(
+            Update,
+            modulate_volume // TODO: .run_if(any_component_added::<AudioSink>)
+        )
         .add_systems(Update, grid_gizmo)
         .add_systems(
             Update,
@@ -58,6 +63,10 @@ fn main() {
                 .run_if(in_state(SimulationState::Run))
                 .run_if(cooldown_secs(FRAME_DURATION)),
         )
+        .add_systems(
+            Update,
+            start_audio_synced.run_if(cooldown_secs(FRAME_DURATION))
+        )
         .add_systems(
             Update,
             simulation_step.run_if(on_message::<SimulationState>),
@@ -325,7 +334,17 @@ fn on_add_coordinates(
     commands.entity(trigger.entity).insert(t);
 
     let p = cell_assets.pitches.get(&c.as_cell_pitch()).unwrap();
-    commands.entity(trigger.entity).insert((AudioPlayer(p.clone()), PlaybackSettings::LOOP));
+    commands.entity(trigger.entity).insert((AudioPlayer(p.clone()), PlaybackSettings::ONCE));
+}
+
+/// All audio starts paused so we can keep them in sync
+/// This starts audios when the system is triggered, which is on a timer
+fn start_audio_synced(query: Query<&AudioSink, With<Cell>>) {
+    query.iter().for_each(|sink| {
+        if sink.is_paused() {
+            sink.play()
+        }
+    });
 }
 
 /// When the cursor moves, update the Coordiantes
@@ -552,6 +571,12 @@ enum Note {
 }
 
 impl Note {
+    /// Pitches:
+    /// A -440 Hz
+    /// B - 493.88 Hz
+    /// C# - 554.37 Hz
+    /// E - 659.25 Hz
+    /// F# - 698.46 Hz
     fn as_frequency(&self) -> f32 {
         match self {
             Note::A => 440.0,
@@ -570,26 +595,13 @@ struct CellPitch {
 }
 
 impl CellPitch {
-    /// Pitches:
-    /// A -440 Hz
-    /// B - 493.88 Hz
-    /// C# - 554.37 Hz
-    /// E - 659.25 Hz
-    /// F# - 698.46 Hz
     fn to_frequency(&self) -> f32 {
-        let base_note = self.note.as_frequency();
-        match self.octave {
-            // Negative octave values -> lower notes
-            ..=-1 => base_note / (self.octave as f32),
-            0 => base_note,
-            // Positive octave values -> higher notes
-            1.. => base_note * (self.octave as f32),
-        }
+        // Thanks Claude Opus 4.8
+        self.note.as_frequency() * 2f32.powi(self.octave as i32)
     }
 }
 
 fn load_audio_tones(mut pitches: ResMut<Assets<Pitch>>, mut cell_assets: ResMut<CellAssets>) {
-    let duration = Duration::from_secs_f32(FRAME_DURATION);
     let notes = [Note::A, Note::B, Note::CSharp, Note::E, Note::FSharp];
     let octaves = [-2, -1, 0, 1, 2];
 
@@ -600,6 +612,7 @@ fn load_audio_tones(mut pitches: ResMut<Assets<Pitch>>, mut cell_assets: ResMut<
                 octave: *octave,
             };
             let frequency = cell_pitch.to_frequency();
+            let duration = Duration::from_secs(100);
             let handle = pitches.add(Pitch {
                 frequency,
                 duration,
@@ -610,6 +623,11 @@ fn load_audio_tones(mut pitches: ResMut<Assets<Pitch>>, mut cell_assets: ResMut<
     debug_assert!(cell_assets.pitches.iter().len() == 25);
 }
 
+fn modulate_volume(mut gv: ResMut<GlobalVolume>, active: Query<Entity, With<AudioSink>>) {
+    let ratio = 1.0 / active.count() as f32;
+    gv.volume = Volume::Linear(ratio);
+}
+
 fn load_materials(
     server: ResMut<AssetServer>,
     mut cell_assets: ResMut<CellAssets>,
@@ -638,14 +656,3 @@ fn load_materials(
 fn load_meshes(mut cell_assets: ResMut<CellAssets>, mut meshes: ResMut<Assets<Mesh>>) {
     cell_assets.mesh = meshes.add(Rectangle::new(SCALE, SCALE));
 }
-
-fn play_audio_tone(cell_assets: Res<CellAssets>, mut commands: Commands) {
-    let handle = cell_assets
-        .pitches
-        .get(&CellPitch {
-            note: Note::A,
-            octave: 0,
-        })
-        .unwrap();
-    commands.spawn((AudioPlayer(handle.clone()), PlaybackSettings::LOOP));
-}