From 105c93e012e10effbe27ca0a87953e765729e0c3 Mon Sep 17 00:00:00 2001
From: Felix Ableitner <me@nutomic.com>
Date: Sat, 2 Jan 2021 22:34:05 +0100
Subject: [PATCH] Move mouse event reader into system local variable

---
 src/player.rs | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/src/player.rs b/src/player.rs
index b15d22d..bad44e4 100644
--- a/src/player.rs
+++ b/src/player.rs
@@ -17,18 +17,12 @@ pub struct PlayerPlugin;
 impl Plugin for PlayerPlugin {
   fn build(&self, app: &mut AppBuilder) {
     app
-      .init_resource::<State>()
       .add_system(player_movement_system.system())
       .add_system(player_look_system.system())
       .add_startup_system(init_player.system());
   }
 }
 
-#[derive(Default)]
-struct State {
-  mouse_motion_event_reader: EventReader<MouseMotion>,
-}
-
 #[derive(Default)]
 struct PlayerMarker;
 
@@ -133,12 +127,12 @@ fn movement_axis(input: &Res<Input<KeyCode>>, plus: KeyCode, minus: KeyCode) ->
 
 fn player_look_system(
   time: Res<Time>,
-  mut state: ResMut<State>,
+  mut mouse_event_reader: Local<EventReader<MouseMotion>>,
   mouse_motion_events: Res<Events<MouseMotion>>,
   mut query: Query<(&mut Transform, &mut CameraData)>,
 ) {
   let mut delta: Vec2 = Vec2::zero();
-  for event in state.mouse_motion_event_reader.iter(&mouse_motion_events) {
+  for event in mouse_event_reader.iter(&mouse_motion_events) {
     delta += event.delta;
   }
   if delta.is_nan() {