enable threaded ecs and implement some micro-optimizations

Author: mat-1

Cargo.toml

@@ -35,7 +35,9 @@ anyhow = "1.0.100"
 async-compat = "0.2.5"
 base64 = "0.22.1"
 bevy_app = "0.18.0"
-bevy_ecs = { version = "0.18.0", default-features = false }
+bevy_ecs = { version = "0.18.0", default-features = false, features = [
+    "multi_threaded",
+] }
 bevy_utils = { version = "0.18.0", default-features = false }
 bevy_log = "0.18.0"
 bevy_tasks = "0.18.0"

azalea-entity/src/plugin/mod.rs

@@ -254,10 +254,10 @@ pub struct InLoadedChunk;
 /// Update the [`InLoadedChunk`] component for all entities in the world.
 pub fn update_in_loaded_chunk(
     mut commands: bevy_ecs::system::Commands,
-    query: Query<(Entity, &WorldName, &Position)>,
+    query: Query<(Entity, &WorldName, &Position, Option<&InLoadedChunk>)>,
     worlds: Res<Worlds>,
 ) {
-    for (entity, world_name, position) in &query {
+    for (entity, world_name, position, last_in_loaded_chunk) in &query {
         let player_chunk_pos = ChunkPos::from(position);
         let Some(world_lock) = worlds.get(world_name) else {
             commands.entity(entity).remove::<InLoadedChunk>();
@@ -266,9 +266,13 @@ pub fn update_in_loaded_chunk(
 
         let in_loaded_chunk = world_lock.read().chunks.get(&player_chunk_pos).is_some();
         if in_loaded_chunk {
-            commands.entity(entity).insert(InLoadedChunk);
+            if last_in_loaded_chunk.is_none() {
+                commands.entity(entity).insert(InLoadedChunk);
+            }
         } else {
-            commands.entity(entity).remove::<InLoadedChunk>();
+            if last_in_loaded_chunk.is_some() {
+                commands.entity(entity).remove::<InLoadedChunk>();
+            }
         }
     }
 }