Reduce rewind data being stored

src/bin/flappy/main.rs

@@ -130,13 +130,9 @@ enum PlayerState {
 // A tape tracking the bird's state every frame
 #[derive(Component, Default)]
 struct Tape {
-    accumulated_translations: Vec<AccumulatedTranslation>,
     linear_velocities: Vec<LinearVelocity>,
     angular_velocities: Vec<AngularVelocity>,
-    external_angular_impulses: Vec<ExternalAngularImpulse>,
-    external_forces: Vec<ExternalForce>,
     external_impulses: Vec<ExternalImpulse>,
-    external_torques: Vec<ExternalTorque>,
     positions: Vec<Position>,
     rotations: Vec<Rotation>,
 }
@@ -418,7 +414,7 @@ struct RewindSfx;
 #[derive(Component)]
 struct RewindButton;
 
-fn init_ui(mut commands: Commands, mut server: ResMut<AssetServer>) {
+fn init_ui(mut commands: Commands, server: Res<AssetServer>) {
     commands
         .spawn((
             Node {
@@ -525,10 +521,6 @@ fn init_ui(mut commands: Commands, mut server: ResMut<AssetServer>) {
         })
         .observe(hide_credits);
 
-    fn start_game(_trigger: Trigger<Pointer<Click>>, mut next: ResMut<NextState<PlayerState>>) {
-        next.set(PlayerState::Alive);
-    }
-
     commands.spawn((
         Node {
             align_self: AlignSelf::Center,
@@ -738,13 +730,9 @@ fn record(
     #[cfg(debug_assertions)] state: Res<State<PlayerState>>,
     mut birds: Query<
         (
-            &AccumulatedTranslation,
             &LinearVelocity,
             &AngularVelocity,
-            &ExternalAngularImpulse,
-            &ExternalForce,
             &ExternalImpulse,
-            &ExternalTorque,
             &Position,
             &Rotation,
             &mut Tape,
@@ -760,14 +748,10 @@ fn record(
 
     birds
         .iter_mut()
-        .for_each(|(at, lv, av, eai, ef, ei, et, p, r, mut tape)| {
+        .for_each(|(lv, av, ei, p, r, mut tape)| {
-            tape.accumulated_translations.push(*at);
             tape.linear_velocities.push(*lv);
             tape.angular_velocities.push(*av);
-            tape.external_angular_impulses.push(*eai);
-            tape.external_forces.push(*ef);
             tape.external_impulses.push(*ei);
-            tape.external_torques.push(*et);
             tape.positions.push(*p);
             tape.rotations.push(*r);
         });
@@ -778,13 +762,9 @@ fn rewind(
     mut next: ResMut<NextState<PlayerState>>,
     mut birds: Query<
         (
-            &mut AccumulatedTranslation,
             &mut LinearVelocity,
             &mut AngularVelocity,
-            &mut ExternalAngularImpulse,
-            &mut ExternalForce,
             &mut ExternalImpulse,
-            &mut ExternalTorque,
             &mut Position,
             &mut Rotation,
             &mut Tape,
@@ -800,26 +780,15 @@ fn rewind(
     );
 
     birds.iter_mut().for_each(
-        |(mut at, mut lv, mut av, mut eai, mut ef, mut ei, mut et, mut p, mut r, mut tape)| {
+        |(mut lv, mut av, mut ei, mut p, mut r, mut tape)| {
             if tape.positions.is_empty() {
                 next.set(PlayerState::Pause);
             } else {
-                // TODO: Only record/restore variables that we manage!
-                at.0 = tape.accumulated_translations.pop().unwrap().0;
                 lv.0 = tape.linear_velocities.pop().unwrap().0;
                 av.0 = tape.angular_velocities.pop().unwrap().0;
-                eai.set_impulse(tape.external_angular_impulses.pop().unwrap().impulse());
-                ef.set_force(tape.external_forces.pop().unwrap().force());
                 ei.set_impulse(tape.external_impulses.pop().unwrap().impulse());
-                et.set_torque(tape.external_torques.pop().unwrap().torque());
                 p.0 = tape.positions.pop().unwrap().0;
-                *r = {
+                *r = tape.rotations.pop().unwrap();
-                    let curr = tape.rotations.pop().unwrap();
-                    Rotation {
-                        cos: curr.cos,
-                        sin: curr.sin,
-                    }
-                };
                 frames.0 += 1;
             }
         },