Vendor dependencies for 0.3.0 release

vendor/bevy/examples/audio/pitch.rs

@@ -0,0 +1,55 @@
+//! This example illustrates how to play a single-frequency sound (aka a pitch)
+
+use bevy::prelude::*;
+use std::time::Duration;
+
+fn main() {
+    App::new()
+        .add_plugins(DefaultPlugins)
+        .add_event::<PlayPitch>()
+        .add_systems(Startup, setup)
+        .add_systems(Update, (play_pitch, keyboard_input_system))
+        .run();
+}
+
+#[derive(Event, Default)]
+struct PlayPitch;
+
+#[derive(Resource)]
+struct PitchFrequency(f32);
+
+fn setup(mut commands: Commands) {
+    commands.insert_resource(PitchFrequency(220.0));
+}
+
+fn play_pitch(
+    mut pitch_assets: ResMut<Assets<Pitch>>,
+    frequency: Res<PitchFrequency>,
+    mut events: EventReader<PlayPitch>,
+    mut commands: Commands,
+) {
+    for _ in events.read() {
+        info!("playing pitch with frequency: {}", frequency.0);
+        commands.spawn((
+            AudioPlayer(pitch_assets.add(Pitch::new(frequency.0, Duration::new(1, 0)))),
+            PlaybackSettings::DESPAWN,
+        ));
+        info!("number of pitch assets: {}", pitch_assets.len());
+    }
+}
+
+fn keyboard_input_system(
+    keyboard_input: Res<ButtonInput<KeyCode>>,
+    mut frequency: ResMut<PitchFrequency>,
+    mut events: EventWriter<PlayPitch>,
+) {
+    if keyboard_input.just_pressed(KeyCode::ArrowUp) {
+        frequency.0 *= ops::powf(2.0f32, 1.0 / 12.0);
+    }
+    if keyboard_input.just_pressed(KeyCode::ArrowDown) {
+        frequency.0 /= ops::powf(2.0f32, 1.0 / 12.0);
+    }
+    if keyboard_input.just_pressed(KeyCode::Space) {
+        events.write(PlayPitch);
+    }
+}