feat(objects): async tracked abstraction

src/objects/input/oxr_controller.rs

@@ -12,7 +12,7 @@ use crate::{
 		input::{INPUT_HANDLER_REGISTRY, InputDataType, InputHandler, InputMethod, Tip},
 		spatial::Spatial,
 	},
-	objects::{ObjectHandle, SpatialRef, Tracked},
+	objects::{AsyncTracked, ObjectHandle, SpatialRef, Tracked},
 };
 use bevy::{asset::Handle, ecs::resource::Resource};
 use bevy::{math::Affine3, prelude::*};
@@ -268,7 +268,7 @@ pub struct OxrControllerInput {
 	model_part: Arc<ModelPart>,
 	capture_manager: CaptureManager,
 	datamap: ControllerDatamap,
-	tracked: ObjectHandle<Tracked>,
+	tracked: AsyncTracked,
 	space: Option<XrSpace>,
 }
 impl OxrControllerInput {
@@ -279,7 +279,7 @@ impl OxrControllerInput {
 				HandSide::Right => "right",
 			};
 		let (spatial, object_handle) = SpatialRef::create(connection, &path);
-		let tracked = Tracked::new(connection, &path);
+		let tracked = AsyncTracked::new(connection, &path);
 		let tip = InputDataType::Tip(Tip::default());
 		let node = spatial.node().unwrap();
 		node.set_enabled(false);
@@ -314,13 +314,7 @@ impl OxrControllerInput {
 		if let Some(node) = self.input.spatial.node() {
 			node.set_enabled(enabled);
 		}
-		tokio::spawn({
-			// this is suboptimal since it probably allocates a fresh string every frame
-			let handle = self.tracked.clone();
-			async move {
-				handle.set_tracked(enabled).await;
-			}
-		});
+		self.tracked.set_tracked(enabled);
 	}
 	fn update(
 		&mut self,

src/objects/input/oxr_hand.rs

@@ -7,7 +7,7 @@ use crate::nodes::{
 	input::{Hand, InputMethod, Joint},
 	spatial::Spatial,
 };
-use crate::objects::{ObjectHandle, SpatialRef, Tracked};
+use crate::objects::{AsyncTracked, ObjectHandle, SpatialRef, Tracked};
 use crate::{BevyMaterial, DbusConnection, ObjectRegistryRes, PreFrameWait};
 use bevy::prelude::Transform as BevyTransform;
 use bevy::prelude::*;
@@ -52,23 +52,14 @@ fn update_hands(
 	joints_query: Query<&XrHandBoneEntities>,
 ) {
 	let (Some(session), Some(state), Some(ref_space)) = (session, state, ref_space) else {
-		tokio::task::spawn({
-			let left = hands.left.tracked.clone();
-			let right = hands.right.tracked.clone();
-			async move {
-				left.set_tracked(false);
-				right.set_tracked(false);
-			}
-		});
+		hands.left.tracked.set_tracked(false);
+		hands.right.tracked.set_tracked(false);
 		return;
 	};
 	let get_joints = |hand: &mut OxrHandInput| -> Option<openxr::HandJointLocations> {
 		let Some(tracker) = hand.tracker.as_ref() else {
 			hand.input.spatial.node().unwrap().set_enabled(false);
-			let handle = hand.tracked.clone();
-			tokio::task::spawn(async move {
-				handle.set_tracked(false);
-			});
+			hand.tracked.set_tracked(false);
 			return None;
 		};
 		// this won't be correct with pipelined rendering
@@ -182,7 +173,7 @@ pub struct OxrHandInput {
 	input: Arc<InputMethod>,
 	capture_manager: CaptureManager,
 	datamap: HandDatamap,
-	tracked: ObjectHandle<Tracked>,
+	tracked: AsyncTracked,
 	tracker: Option<openxr::HandTracker>,
 	captured: bool,
 	material: Handle<BevyMaterial>,
@@ -201,7 +192,7 @@ impl OxrHandInput {
 					HandSide::Right => "right",
 				} + "/palm"),
 		);
-		let tracked = Tracked::new(
+		let tracked = AsyncTracked::new(
 			connection,
 			&("/org/stardustxr/Hand/".to_string()
 				+ match side {
@@ -243,13 +234,7 @@ impl OxrHandInput {
 		if let Some(node) = self.input.spatial.node() {
 			node.set_enabled(enabled);
 		}
-		tokio::spawn({
-			// this is suboptimal since it probably allocates a fresh string every frame
-			let handle = self.tracked.clone();
-			async move {
-				handle.set_tracked(enabled).await;
-			}
-		});
+		self.tracked.set_tracked(enabled);
 	}
 	fn update(
 		&mut self,

src/objects/mod.rs

@@ -20,6 +20,7 @@ use std::{
 	marker::PhantomData,
 	sync::{Arc, atomic::Ordering},
 };
+use tokio::{sync::mpsc, task::AbortHandle};
 use zbus::{Connection, interface, object_server::Interface, zvariant::OwnedObjectPath};
 
 pub mod hmd;
@@ -43,6 +44,48 @@ impl<I: Interface> Drop for ObjectHandle<I> {
 	}
 }
 
+/// A wrapper around ObjectHandle<Tracked> that batches async updates
+/// instead of spawning a tokio task for each state change
+pub struct AsyncTracked {
+	pub sender: mpsc::UnboundedSender<bool>,
+	pub _handle: ObjectHandle<Tracked>,
+	pub _abort_handle: AbortHandle,
+}
+
+impl AsyncTracked {
+	pub fn new(connection: &Connection, path: &str) -> Self {
+		let handle = Tracked::new(connection, path);
+		let (sender, mut receiver) = mpsc::unbounded_channel::<bool>();
+
+		// Spawn a single long-running task that processes state updates
+		let task = tokio::task::spawn({
+			let handle = handle.clone();
+			async move {
+				while let Some(is_tracked) = receiver.recv().await {
+					let _ = handle.set_tracked(is_tracked).await;
+				}
+			}
+		});
+
+		Self {
+			sender,
+			_handle: handle,
+			_abort_handle: task.abort_handle(),
+		}
+	}
+
+	pub fn set_tracked(&self, is_tracked: bool) {
+		// Just send over channel instead of spawning a task
+		let _ = self.sender.send(is_tracked);
+	}
+}
+
+impl Drop for AsyncTracked {
+	fn drop(&mut self) {
+		self._abort_handle.abort();
+	}
+}
+
 pub struct SpatialRef(u64, OwnedNode);
 impl SpatialRef {
 	pub fn create(connection: &Connection, path: &str) -> (Arc<Spatial>, ObjectHandle<SpatialRef>) {

src/objects/play_space.rs

@@ -16,7 +16,7 @@ use zbus::{Connection, ObjectServer, interface};
 
 use crate::{DbusConnection, PreFrameWait, nodes::spatial::Spatial};
 
-use super::{ObjectHandle, SpatialRef, Tracked};
+use super::{AsyncTracked, ObjectHandle, SpatialRef, Tracked};
 
 pub struct PlaySpacePlugin;
 impl Plugin for PlaySpacePlugin {
@@ -31,7 +31,7 @@ impl Plugin for PlaySpacePlugin {
 fn setup(connection: Res<DbusConnection>, mut cmds: Commands) {
 	let (spatial, spatial_handle) = SpatialRef::create(&connection, "/org/stardustxr/PlaySpace");
 	// the OpenXR session might not exist quite yet
-	let tracked = Tracked::new(&connection, "/org/stardustxr/PlaySpace");
+	let tracked = AsyncTracked::new(&connection, "/org/stardustxr/PlaySpace");
 	let dbus_connection = connection.clone();
 	let play_space_data = Arc::new(RwLock::default());
 	tokio::task::spawn({
@@ -80,12 +80,7 @@ fn update(
 		(session, stage, ref_space, state)
 	else {
 		play_space.bounds.write().drain(..);
-		tokio::task::spawn({
-			let handle = play_space.tracked_handle.clone();
-			async move {
-				handle.set_tracked(false).await;
-			}
-		});
+		play_space.tracked_handle.set_tracked(false);
 
 		play_space
 			.spatial
@@ -103,12 +98,7 @@ fn update(
 				| SpaceLocationFlags::ORIENTATION_VALID
 				| SpaceLocationFlags::ORIENTATION_TRACKED,
 		);
-		tokio::task::spawn({
-			let handle = play_space.tracked_handle.clone();
-			async move {
-				handle.set_tracked(is_tracked).await;
-			}
-		});
+		play_space.tracked_handle.set_tracked(is_tracked);
 		if is_tracked {
 			play_space
 				.spatial
@@ -140,7 +130,7 @@ fn update(
 pub struct PlaySpace {
 	spatial: Arc<Spatial>,
 	_spatial_handle: ObjectHandle<SpatialRef>,
-	tracked_handle: ObjectHandle<Tracked>,
+	tracked_handle: AsyncTracked,
 	bounds: Arc<RwLock<Vec<(f64, f64)>>>,
 }
 pub struct PlaySpaceBounds(Arc<RwLock<Vec<(f64, f64)>>>);