add a thruster sound when accelerating

src/audio.rs

@@ -1,8 +1,12 @@
 use bevy::prelude::*;
+use bevy::audio::PlaybackMode;
 
 #[derive(Component)]
 pub struct ComponentBGM;
 
+#[derive(Component)]
+pub struct ComponentThrusterSound;
+
 #[derive(Resource)]
 struct SoundBGM(Handle<AudioSource>);
 
@@ -25,6 +29,17 @@ pub fn setup(
             settings: PlaybackSettings::DESPAWN,
         },
     ));
+    commands.spawn((
+        ComponentThrusterSound,
+        AudioBundle {
+            source: asset_server.load("restricted/loopingthrust-95548.ogg"),
+            settings: PlaybackSettings {
+                mode: PlaybackMode::Loop,
+                paused: true,
+                ..default()
+            },
+        },
+    ));
 }
 
 pub fn toggle_bgm(

src/camera.rs

@@ -2,6 +2,7 @@ use bevy::prelude::*;
 use bevy::input::mouse::MouseMotion;
 use bevy::window::PrimaryWindow;
 use std::{f32::consts::*, fmt};
+use crate::audio;
 
 pub struct CameraControllerPlugin;
 
@@ -96,11 +97,13 @@ fn run_camera_controller(
     mut mouse_events: EventReader<MouseMotion>,
     mouse_button_input: Res<ButtonInput<MouseButton>>,
     key_input: Res<ButtonInput<KeyCode>>,
+    thruster_sound_controller: Query<&AudioSink, With<audio::ComponentThrusterSound>>,
     mut toggle_cursor_grab: Local<bool>,
     mut mouse_cursor_grab: Local<bool>,
     mut query: Query<(&mut Transform, &mut CameraController), With<Camera>>,
 ) {
     let dt = time.delta_seconds();
+    let mut play_thruster_sound = false;
 
     let window_result = windows.get_single_mut();
     let mut focused = true;
@@ -164,6 +167,7 @@ fn run_camera_controller(
                 controller.walk_speed
             };
             controller.velocity = axis_input.normalize() * max_speed;
+            play_thruster_sound = true;
         } else {
             let friction = controller.friction.clamp(0.0, 1.0);
             controller.velocity *= 1.0 - friction;
@@ -196,5 +200,13 @@ fn run_camera_controller(
             transform.rotation =
                 Quat::from_euler(EulerRot::ZYX, 0.0, controller.yaw, controller.pitch);
         }
+
+        if let Ok(sink) = thruster_sound_controller.get_single() {
+            if play_thruster_sound {
+                sink.play()
+            } else {
+                sink.pause()
+            }
+        }
     }
 }