From efd874957331d8bff1cefa0f43d81685690391bf Mon Sep 17 00:00:00 2001
From: mat <github@matdoes.dev>
Date: Mon, 20 Jun 2022 01:19:59 -0500
Subject: add gametick event and find_one_entity

---
 azalea-client/src/client.rs | 46 +++++++++++++++++++++++++++++++++++++++------
 1 file changed, 40 insertions(+), 6 deletions(-)

(limited to 'azalea-client/src')

diff --git a/azalea-client/src/client.rs b/azalea-client/src/client.rs
index 3dd206b5..828578de 100644
--- a/azalea-client/src/client.rs
+++ b/azalea-client/src/client.rs
@@ -26,7 +26,10 @@ use std::{
     fmt::Debug,
     sync::{Arc, Mutex},
 };
-use tokio::sync::mpsc::{self, UnboundedReceiver, UnboundedSender};
+use tokio::{
+    sync::mpsc::{self, UnboundedReceiver, UnboundedSender},
+    time::{self, MissedTickBehavior},
+};
 
 #[derive(Default)]
 pub struct ClientState {
@@ -38,6 +41,8 @@ pub struct ClientState {
 pub enum Event {
     Login,
     Chat(ChatPacket),
+    /// A game tick, happens 20 times per second.
+    GameTick,
 }
 
 #[derive(Debug, Clone)]
@@ -153,20 +158,22 @@ impl Client {
             conn: conn.clone(),
             state: Arc::new(Mutex::new(ClientState::default())),
         };
-        // let client = Arc::new(Mutex::new(client));
-        // let weak_client = Arc::<_>::downgrade(&client);
 
         // just start up the game loop and we're ready!
-        // tokio::spawn(Self::game_loop(conn, tx, handler, state))
 
         let game_loop_state = client.state.clone();
 
-        tokio::spawn(Self::game_loop(conn, tx, game_loop_state));
+        tokio::spawn(Self::protocol_loop(
+            conn.clone(),
+            tx.clone(),
+            game_loop_state.clone(),
+        ));
+        tokio::spawn(Self::game_tick_loop(conn, tx, game_loop_state));
 
         Ok(client)
     }
 
-    async fn game_loop(
+    async fn protocol_loop(
         conn: Arc<tokio::sync::Mutex<GameConnection>>,
         tx: UnboundedSender<Event>,
         state: Arc<Mutex<ClientState>>,
@@ -487,6 +494,33 @@ impl Client {
         self.event_receiver.recv().await
     }
 
+    /// Runs game_tick every 50 milliseconds.
+    async fn game_tick_loop(
+        conn: Arc<tokio::sync::Mutex<GameConnection>>,
+        tx: UnboundedSender<Event>,
+        state: Arc<Mutex<ClientState>>,
+    ) {
+        let mut game_tick_interval = time::interval(time::Duration::from_millis(50));
+        // TODO: Minecraft bursts up to 10 ticks and then skips, we should too
+        game_tick_interval.set_missed_tick_behavior(time::MissedTickBehavior::Burst);
+        loop {
+            game_tick_interval.tick().await;
+            Self::game_tick(&conn, &tx, &state).await;
+        }
+    }
+
+    /// Runs every 50 milliseconds.
+    async fn game_tick(
+        conn: &Arc<tokio::sync::Mutex<GameConnection>>,
+        tx: &UnboundedSender<Event>,
+        state: &Arc<Mutex<ClientState>>,
+    ) {
+        if state.lock().unwrap().world.is_none() {
+            return;
+        }
+        tx.send(Event::GameTick).unwrap();
+    }
+
     /// Gets the `World` the client is in.
     ///
     /// This is basically a shortcut for `let world = client.state.lock().unwrap().world.as_ref().unwrap()`.
-- 
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