game: improve event handling, update input systems to use new event handling

Cargo.lock

@@ -2107,6 +2107,7 @@ dependencies = [
  "anyhow",
  "async-std",
  "async-trait",
+ "atomic_refcell",
  "bind_match",
  "bytemuck",
  "cfg-if",

lyra-game/Cargo.toml

@@ -40,6 +40,7 @@ petgraph = { version = "0.6.5", features = ["matrix_graph"] }
 bind_match = "0.1.2"
 round_mult = "0.1.3"
 fast_poisson = { version = "1.0.0", features = ["single_precision"] }
+atomic_refcell = "0.1.13"
 
 [features]
 tracy = ["dep:tracing-tracy"]

lyra-game/src/event.rs

@@ -0,0 +1,137 @@
+use std::sync::Arc;
+
+use atomic_refcell::AtomicRefCell;
+use lyra_ecs::{query::{ResMut, WorldTick}, system::FnArgFetcher, Tick};
+
+pub trait Event: Clone + Send + Sync + 'static {}
+impl<T: Clone + Send + Sync + 'static> Event for T {}
+
+pub struct Events<T: Event> {
+    events: Arc<AtomicRefCell<Vec<T>>>,
+    last_updated_tick: Option<Tick>,
+}
+
+impl<T: Event> Default for Events<T> {
+    fn default() -> Self {
+        Self { events: Default::default(), last_updated_tick: None }
+    }
+}
+
+impl<T: Event> Events<T> {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    pub fn push_event(&mut self, event: T) {
+        let mut events = self.events.borrow_mut();
+        events.push(event);
+    }
+
+    pub fn reader(&self) -> EventReader<T> {
+        EventReader {
+            events: self.events.clone(),
+            cursor: 0,
+        }
+    }
+
+    pub fn writer(&self) -> EventWriter<T> {
+        EventWriter {
+            events: self.events.clone(),
+        }
+    }
+}
+
+pub struct EventReader<T: Event> {
+    events: Arc<AtomicRefCell<Vec<T>>>,
+    cursor: usize,
+}
+
+impl<T: Event> EventReader<T> {
+    pub fn read(&mut self) -> Option<atomic_refcell::AtomicRef<T>> {
+        let events = self.events.borrow();
+        
+        if self.cursor >= events.len() {
+            None
+        } else {
+            let e = atomic_refcell::AtomicRef::map(events, 
+                |e| e.get(self.cursor).unwrap());
+            self.cursor += 1;
+            Some(e)
+        }
+    }
+}
+
+pub struct EventWriter<T: Event> {
+    events: Arc<AtomicRefCell<Vec<T>>>,
+}
+
+impl<T: Event> EventWriter<T> {
+    pub fn write(&mut self, event: T) {
+        let mut events = self.events.borrow_mut();
+        events.push(event);
+    }
+}
+
+/// Clean events of event type `T` every 2 ticks.
+pub fn event_cleaner_system<T>(tick: WorldTick, mut events: ResMut<Events<T>>) -> anyhow::Result<()>
+where 
+    T: Event
+{
+    let last_tick = *events.last_updated_tick.unwrap_or(*tick);
+    let world_tick = **tick;
+
+    if last_tick + 2 < world_tick {
+        events.last_updated_tick = Some(*tick);
+
+        let mut events = events.events.borrow_mut();
+        events.clear();
+    }
+
+    Ok(())
+}
+
+impl<T: Event> FnArgFetcher for EventReader<T> {
+    type State = usize;
+
+    type Arg<'a, 'state> = EventReader<T>;
+
+    fn create_state(_: std::ptr::NonNull<lyra_ecs::World>) -> Self::State {
+        0
+    }
+
+    unsafe fn get<'a, 'state>(state: &'state mut Self::State, world: std::ptr::NonNull<lyra_ecs::World>) -> Self::Arg<'a, 'state> {
+        let world = world.as_ref();
+        let events = world.get_resource::<Events<T>>();
+
+        // reset the reader cursor when the events are cleared
+        let world_tick = world.current_tick();
+        if world_tick == events.last_updated_tick.unwrap_or(world_tick) {
+            *state = 0;
+        }
+
+        let mut reader = events.reader();
+        reader.cursor = *state;
+
+        reader
+    }
+
+    fn apply_deferred(_: Self::State, _: std::ptr::NonNull<lyra_ecs::World>) { }
+}
+
+impl<T: Event> FnArgFetcher for EventWriter<T> {
+    type State = ();
+
+    type Arg<'a, 'state> = EventWriter<T>;
+
+    fn create_state(_: std::ptr::NonNull<lyra_ecs::World>) -> Self::State {
+        ()
+    }
+
+    unsafe fn get<'a, 'state>(_: &'state mut Self::State, world: std::ptr::NonNull<lyra_ecs::World>) -> Self::Arg<'a, 'state> {
+        let world = world.as_ref();
+        let events = world.get_resource::<Events<T>>();
+        events.writer()
+    }
+
+    fn apply_deferred(_: Self::State, _: std::ptr::NonNull<lyra_ecs::World>) { }
+}

lyra-game/src/events.rs

@@ -1,202 +0,0 @@
-use std::{any::{Any, TypeId}, collections::{HashMap, VecDeque}, marker::PhantomData, mem::{self, MaybeUninit}, ops::Range};
-
-use crate::plugin::Plugin;
-
-pub trait Event: Clone + Send + Sync + 'static {}
-impl<T: Clone + Send + Sync + 'static> Event for T {}
-
-pub type Events<T> = VecDeque<T>;
-
-#[derive(Clone)]
-struct TypeErasedBuffer {
-    type_id: TypeId,
-    item_size: usize,
-    data: Vec<MaybeUninit<u8>>,
-    fn_drop_item: fn(item: *mut ()),
-}
-
-impl Drop for TypeErasedBuffer {
-    fn drop(&mut self) {
-        let range = self.data.as_mut_ptr_range();
-        let mut current = range.start;
-        let end = range.end;
-
-        while current < end {
-            // SAFETY: current pointer will either be the start of the buffer, or at the start of
-            // the next item
-            (self.fn_drop_item)(current.cast());
-
-            // SAFETY: the items are placed right after eachother
-            current = unsafe { current.add(self.item_size) };
-        }
-
-        // Safety: all of the events were just dropped
-        unsafe { self.data.set_len(0) };
-    }
-}
-
-impl TypeErasedBuffer {
-    pub fn new<T: 'static>() -> Self {
-        Self {
-            type_id: TypeId::of::<T>(),
-            item_size: mem::size_of::<T>(),
-            data: Default::default(),
-            // dropped immediately after the read
-            fn_drop_item: |item| unsafe { item.cast::<T>().drop_in_place() },
-        }
-    }
-
-    pub fn push<T: 'static>(&mut self, value: T) {
-        debug_assert!(TypeId::of::<T>() == self.type_id, "The type of the buffer does not match the type that was added to it");
-
-        // reserve enough bytes to store T
-        let old_len = self.data.len();
-        self.data.reserve(mem::size_of::<T>());
-
-        // Get a pointer to the end of the data.
-        // SAFETY: we just reserved enough memory to store the data.
-        let end_ptr = unsafe { self.data.as_mut_ptr().add(old_len) };
-
-        unsafe {
-            // write the command and its runner into the buffer
-            end_ptr.cast::<T>()
-                // written unaligned to keep everything packed
-                .write_unaligned(value);
-
-            // we wrote to the vec's buffer without using its api, so we need manually
-            // set the length of the vec.
-            self.data.set_len(old_len + mem::size_of::<T>());
-        }
-    }
-
-    pub fn len(&self) -> usize {
-        self.data.len() / self.item_size
-    }
-}
-
-pub struct EventQueue {
-    events: HashMap<TypeId, TypeErasedBuffer>,
-    event_write_queue: HashMap<TypeId, TypeErasedBuffer>,
-}
-
-impl Default for EventQueue {
-    fn default() -> Self {
-        Self::new()
-    }
-}
-
-impl EventQueue {
-    pub fn new() -> Self {
-        Self {
-            event_write_queue: HashMap::new(),
-            events: HashMap::new(),
-        }
-    }
-
-    /// Trigger an event
-    pub fn trigger_event<E>(&mut self, event: E)
-    where
-        E: Event
-    {
-        // the compiler wants me to explicit right here for some reason
-        /* let default = || RefCell::new(Box::<Events::<E>>::default() as Box<dyn AsSyncAny>);
-
-        // Get, or create, a list of events of this type
-        let type_id = event.type_id();
-        let mut events = self.event_write_queue.entry(type_id)
-            .or_insert_with(default)
-            .borrow_mut();
-
-        // downcast resource as an events storage
-        let e: &mut Events<E> = events.as_mut().as_any_mut().downcast_mut().unwrap();
-        e.push_back(event); */
-
-        let type_id = event.type_id();
-        let events = self.event_write_queue.entry(type_id)
-            .or_insert_with(|| TypeErasedBuffer::new::<E>());
-
-        events.push(event);
-    }
-
-    // Clear events, this should happen at the start of every tick since events are cloned
-    // before being given to the reader.
-    pub fn update_events(&mut self) {
-        self.events.clear();
-
-        // get all keys of events
-        let keys: Vec<TypeId> = self.event_write_queue.keys().copied().collect();
-
-        // remove all elements from self.event_write_queue and insert them to events
-        for k in keys.into_iter() {
-            let v = self.event_write_queue.remove(&k).unwrap();
-            self.events.insert(k, v);
-        }
-    }
-
-    pub fn read_events<E>(&self) -> Option<EventReader<E>>
-    where
-        E: Event
-    {
-        self.events.get(&TypeId::of::<E>())
-            .map(|event| EventReader::new(event.clone()))
-    }
-}
-
-pub struct EventReader<E: Event> {
-    buf: TypeErasedBuffer,
-    range: Option<Range<*mut MaybeUninit<u8>>>,
-    _marker: PhantomData<E>,
-}
-
-impl<E: Event> EventReader<E> {
-    fn new(buffer: TypeErasedBuffer) -> Self {
-        Self {
-            buf: buffer,
-            range: None,
-            _marker: PhantomData,
-        }
-    }
-
-    pub fn len(&self) -> usize {
-        self.buf.len()
-    }
-    
-    pub fn is_empty(&self) -> bool {
-        self.len() == 0
-    }
-}
-
-impl<E: Event> Iterator for EventReader<E> {
-    type Item = E;
-
-    fn next(&mut self) -> Option<Self::Item> {
-        if self.range.is_none() {
-            self.range = Some(self.buf.data.as_mut_ptr_range());
-        }
-
-        let range = self.range.as_mut().unwrap();
-
-        if range.start < range.end {
-            // Retrieve the event in the buffer.
-            // SAFETY: current pointer will either be the start of the buffer, or at the start
-            // of the next event.
-            let event = unsafe { range.start.cast::<E>().read_unaligned() };
-
-            // Advance the pointer to be after this event.
-            range.start = unsafe { range.start.add(mem::size_of::<E>()) };
-
-            Some(event)
-        } else {
-            None
-        }
-    }
-}
-
-#[derive(Default)]
-pub struct EventsPlugin;
-
-impl Plugin for EventsPlugin {
-    fn setup(&mut self, app: &mut crate::game::App) {
-        app.world.add_resource(EventQueue::new());
-    }
-}

lyra-game/src/game.rs

@@ -10,7 +10,7 @@ use tracing_subscriber::{
     util::SubscriberInitExt, fmt,
 };
 
-use crate::{plugin::Plugin, render::renderer::Renderer, Stage, StagedExecutor};
+use crate::{event_cleaner_system, plugin::Plugin, render::renderer::Renderer, Event, Events, Stage, StagedExecutor};
 
 #[derive(Clone, Copy, Hash, Debug)]
 pub enum GameStages {
@@ -214,4 +214,21 @@ impl App {
             .expect("No run function set");
         f(self);
     }
+
+    pub fn register_event<T: Event>(&mut self) {
+        let world = &mut self.world;
+        // only register the event if it isn't already registered.
+        if !world.has_resource::<Events<T>>() {
+            world.add_resource_default::<Events<T>>();
+            let sys_name = format!("{}_event_cleaner_system", std::any::type_name::<T>().to_lowercase());
+            self.add_system_to_stage(GameStages::First, &sys_name, event_cleaner_system::<T>, &[]);
+        }
+    }
+
+    pub fn push_event<T: Event>(&mut self, event: T) {
+        let world = &mut self.world;
+        let mut events = world.try_get_resource_mut::<Events<T>>()
+            .expect("missing events for event type! Must use `App::register_event` first");
+        events.push_event(event);
+    }
 }

lyra-game/src/input/action.rs

@@ -1,10 +1,10 @@
-use std::{collections::HashMap, ops::Deref, hash::{Hash, DefaultHasher, Hasher}, fmt::Debug};
+use std::{collections::HashMap, hash::{Hash, DefaultHasher, Hasher}, fmt::Debug};
 
 use glam::Vec2;
-use lyra_ecs::World;
+use lyra_ecs::query::{Res, ResMut};
 use lyra_reflect::Reflect;
 
-use crate::{plugin::Plugin, game::GameStages, EventQueue};
+use crate::{game::GameStages, plugin::Plugin, EventReader};
 
 use super::{Button, InputButtons, KeyCode, MouseButton, MouseMotion};
 
@@ -497,64 +497,64 @@ impl ActionHandlerBuilder {
     }
 }
 
-fn actions_system(world: &mut World) -> anyhow::Result<()> {
+//fn actions_system(world: &mut World) -> anyhow::Result<()> {
-    let keys = world.try_get_resource::<InputButtons<KeyCode>>()
+fn actions_system(
-        .map(|r| r.deref().clone());
+    input_btns: Res<InputButtons<KeyCode>>,
-    let mouse_events = world
+    mut mouse_ev: EventReader<MouseMotion>,
-        .try_get_resource::<EventQueue>()
+    mut handler: ResMut<ActionHandler>,
-        .and_then(|q| q.read_events::<MouseMotion>());
+) -> anyhow::Result<()> {
-    //let mouse = world.try_get_resource()
-
     // clear the states of all axises each frame
-    {
-        let mut handler = world.try_get_resource_mut::<ActionHandler>()
-            .expect("No Input Action handler was created in the world!");
-
     let layout = handler.layouts.get(&handler.current_layout).expect("No active layout");
     let mapping = layout.mappings.get(&layout.active_mapping).expect("No active mapping");
-        
     for (action, _) in mapping.action_binds.clone().iter() {
         let action = handler.actions.get_mut(action).expect("Action name for binding is invalid!");
         if action.kind == ActionKind::Axis {
             action.state = ActionState::Axis(0.0);
         }
     }
-    }
     
-    let motion_avg = if let Some(mouse_events) = mouse_events {
+    // collect all events to a list
+    let mouse_events = {
+        let mut evs = vec![];
+        while let Some(ev) = mouse_ev.read() {
+            evs.push(ev.clone());
+        }
+        evs
+    };
+
+    // get the average motion from the events that were collected last frame
+    let motion_avg = if !mouse_events.is_empty() {
         let count = mouse_events.len();
         let mut sum = Vec2::ZERO;
+        
         for mm in mouse_events {
             sum += mm.delta;
         }
-        Some(sum / count as f32)
-    } else { None };
 
-    let mut handler = world.try_get_resource_mut::<ActionHandler>()
+        sum / count as f32
-        .expect("No Input Action handler was created in the world!");
+    } else { Vec2::new(0.0, 0.0) };
 
     let layout = handler.layouts.get(&handler.current_layout).expect("No active layout");
     let mapping = layout.mappings.get(&layout.active_mapping).expect("No active mapping");
-
     for (action_lbl, binds) in mapping.action_binds.clone().iter() {
         let action = handler.actions.get_mut(action_lbl).expect("Action name for binding is invalid!");
         let mut new_state = None;
 
         for bind in binds.iter() {
             match bind.source {
-                ActionSource::Keyboard(key) => if let Some(keys) = &keys {
+                ActionSource::Keyboard(key) => {
                     // JustPressed needs to be first, since is_pressed includes buttons that
                     // were just pressed.
                     match action.kind {
                         ActionKind::Button => {
-                            if keys.was_just_pressed(key) {
+                            if input_btns.was_just_pressed(key) {
                                 new_state = Some(ActionState::JustPressed(bind.modifier));
-                            } else if keys.is_pressed(key) {
+                            } else if input_btns.is_pressed(key) {
                                 new_state = Some(ActionState::Pressed(bind.modifier));
                             }
                         },
                         ActionKind::Axis => {
-                            if keys.is_pressed(key) {
+                            if input_btns.is_pressed(key) {
                                 new_state = Some(ActionState::Axis(bind.modifier));
                             }
                         }
@@ -564,7 +564,7 @@ fn actions_system(world: &mut World) -> anyhow::Result<()> {
                 ActionSource::Gamepad(_, _) => todo!(),
                 ActionSource::Mouse(m) => match m {
                     MouseInput::Button(_) => todo!(),
-                    MouseInput::Axis(a) => if let Some(motion_avg) = motion_avg {
+                    MouseInput::Axis(a) => {
                         match a {
                             MouseAxis::X => {
                                 new_state = Some(ActionState::Axis(motion_avg.x));

lyra-game/src/input/system.rs

@@ -1,49 +1,14 @@
-use std::ptr::NonNull;
+use std::ops::Deref;
 
 use glam::Vec2;
-use lyra_ecs::{World, system::IntoSystem};
+use lyra_ecs::query::ResMut;
-use winit::{event::MouseScrollDelta, keyboard::PhysicalKey};
+use winit::{event::{MouseScrollDelta, WindowEvent}, keyboard::PhysicalKey};
 
-use crate::{EventQueue, plugin::Plugin, game::GameStages};
+use crate::{game::GameStages, plugin::Plugin, winit::DeviceEventPair, EventReader, EventWriter};
 
 use super::{events::*, InputButtons, InputEvent};
 
-#[derive(Default)]
+fn write_scroll_delta(mouse_scroll_ev: &mut EventWriter<MouseScroll>, delta: &MouseScrollDelta) {
-pub struct InputSystem;
-
-impl InputSystem {
-    pub fn process_event(&mut self, world: &mut World, event: &InputEvent) -> bool {
-        let event_queue = world.try_get_resource_mut::<EventQueue>();
-        if event_queue.is_none() {
-            return false;
-        }
-        let mut event_queue = event_queue.unwrap();
-
-        match event {
-            InputEvent::KeyboardInput { device_id, event, .. } => {
-                if let PhysicalKey::Code(code) = event.physical_key {
-                    drop(event_queue);
-                    let mut e = world.get_resource_or_else(InputButtons::<winit::keyboard::KeyCode>::new);
-                    //let mut e = with_resource_mut(world, || InputButtons::<KeyCode>::new());
-                    e.add_input_from_winit(code, event.state);
-                }
-            },
-            InputEvent::CursorMoved { position, .. } => {
-                let exact = MouseExact {
-                    pos: Vec2::new(position.x as f32, position.y as f32)
-                };
-
-                event_queue.trigger_event(exact);
-            },
-            InputEvent::CursorEntered { .. } => {
-                let event = CursorEnteredWindow {};
-                event_queue.trigger_event(event);
-            },
-            InputEvent::CursorLeft { .. } => {
-                let event = CursorLeftWindow {};
-                event_queue.trigger_event(event);
-            },
-            InputEvent::MouseWheel { delta, .. } => {
     let event = match delta {
         MouseScrollDelta::LineDelta(x, y) => MouseScroll {
             unit: MouseScrollUnit::Line(Vec2::new(*x, *y)),
@@ -53,9 +18,46 @@ impl InputSystem {
         },
     };
 
-                event_queue.trigger_event(event);
+    mouse_scroll_ev.write(event);
-            }, //MouseButton
+}
-            InputEvent::MouseInput { button, state, .. } => {
+
+pub fn input_system(
+    mut key_code_res: ResMut<InputButtons<winit::keyboard::KeyCode>>,
+    mut mouse_btn_res: ResMut<InputButtons<MouseButton>>,
+    mut touches_res: ResMut<Touches>,
+    mut window_ev: EventReader<WindowEvent>,
+    mut device_ev: EventReader<DeviceEventPair>,
+    mut mouse_scroll_ev: EventWriter<MouseScroll>,
+    mut mouse_btn_ev: EventWriter<MouseButton>,
+    mut mouse_exact_ev: EventWriter<MouseExact>,
+    mut mouse_entered_ev: EventWriter<CursorEnteredWindow>,
+    mut mouse_left_ev: EventWriter<CursorLeftWindow>,
+    mut mouse_motion_ev: EventWriter<MouseMotion>,
+) -> anyhow::Result<()> {
+    while let Some(event) = window_ev.read() {
+        match event.deref() {
+            WindowEvent::KeyboardInput { event, .. } => {
+                if let PhysicalKey::Code(code) = event.physical_key {
+                    key_code_res.add_input_from_winit(code, event.state);
+                }
+            },
+            WindowEvent::CursorMoved { position, .. } => {
+                let exact = MouseExact {
+                    pos: Vec2::new(position.x as f32, position.y as f32)
+                };
+
+                mouse_exact_ev.write(exact);
+            },
+            WindowEvent::CursorEntered { .. } => {
+                mouse_entered_ev.write(CursorEnteredWindow);
+            },
+            WindowEvent::CursorLeft { .. } => {
+                mouse_left_ev.write(CursorLeftWindow);
+            },
+            WindowEvent::MouseWheel { delta, .. } => {
+                write_scroll_delta(&mut mouse_scroll_ev, delta);
+            },
+            WindowEvent::MouseInput { button, state, .. } => {
                 let button_event = match button {
                     winit::event::MouseButton::Left => MouseButton::Left,
                     winit::event::MouseButton::Right => MouseButton::Right,
@@ -65,15 +67,10 @@ impl InputSystem {
                     winit::event::MouseButton::Other(v) => MouseButton::Other(*v),
                 };
 
-                event_queue.trigger_event(button_event);
+                mouse_btn_ev.write(button_event);
-                drop(event_queue);
+                mouse_btn_res.add_input_from_winit(button_event, *state);
-
-                let mut e = world.get_resource_or_else(InputButtons::<MouseButton>::new);
-                e.add_input_from_winit(button_event, *state);
             },
-            InputEvent::Touch(t) => {
+            WindowEvent::Touch(t) => {
-                drop(event_queue);
-
                 let touch = Touch {
                     phase: TouchPhase::from(t.phase),
                     location: Vec2::new(t.location.x as f32, t.location.y as f32),
@@ -81,61 +78,55 @@ impl InputSystem {
                     finger_id: t.id,
                 };
 
-                let mut touches = world.get_resource_or_else(Touches::new);
+                touches_res.touches.push(touch);
-                touches.touches.push(touch);
             },
             _ => {},
         }
-
-        false
-    }
     }
 
-impl crate::ecs::system::System for InputSystem {
+    while let Some(device) = device_ev.read() {
-    fn execute(&mut self, mut world: NonNull<World>) -> anyhow::Result<()> {
+        match &device.event {
-        let world = unsafe { world.as_mut() };
+            winit::event::DeviceEvent::Motion { .. } => {
-        let queue = world.try_get_resource_mut::<EventQueue>()
+                // TODO: handle device motion events
-            .and_then(|q| q.read_events::<InputEvent>());
+                // A todo! isn't used since these are triggered alongside MouseMotion events
-
-        let mut e = world.get_resource_or_else(InputButtons::<winit::keyboard::KeyCode>::new);
-        e.update();
-        drop(e);
-
-        if queue.is_none() {
-            return Ok(());
             }
+            winit::event::DeviceEvent::MouseMotion { delta } => {
+                let delta = MouseMotion {
+                    delta: Vec2::new(delta.0 as f32, delta.1 as f32)
+                };
 
-        let events = queue.unwrap();
+                mouse_motion_ev.write(delta);
-        for event in events {
+            },
-            self.process_event(world, &event);
+            winit::event::DeviceEvent::MouseWheel { delta } => {
+                write_scroll_delta(&mut mouse_scroll_ev, delta);
+            },
+            _ => {
+                todo!("unhandled device event: {:?}", device.event);
+            }
+        }
     }
 
     Ok(())
 }
 
-    fn world_access(&self) -> lyra_ecs::Access {
-        lyra_ecs::Access::Write
-    }
-    
-    fn execute_deferred(&mut self, _: NonNull<World>) -> anyhow::Result<()> {
-        Ok(())
-    }
-}
-
-impl IntoSystem<()> for InputSystem {
-    type System = Self;
-
-    fn into_system(self) -> Self::System {
-        self
-    }
-}
-
 /// Plugin that runs InputSystem
 #[derive(Default)]
 pub struct InputPlugin;
 
 impl Plugin for InputPlugin {
     fn setup(&mut self, app: &mut crate::game::App) {
-        app.add_system_to_stage(GameStages::PreUpdate, "input", InputSystem, &[]);
+        app.add_resource(InputButtons::<winit::keyboard::KeyCode>::default());
+        app.add_resource(InputButtons::<MouseButton>::default());
+        app.add_resource(Touches::default());
+        
+        app.register_event::<InputEvent>();
+        app.register_event::<MouseScroll>();
+        app.register_event::<MouseButton>();
+        app.register_event::<MouseMotion>();
+        app.register_event::<MouseExact>();
+        app.register_event::<CursorEnteredWindow>();
+        app.register_event::<CursorLeftWindow>();
+
+        app.add_system_to_stage(GameStages::PreUpdate, "input", input_system, &[]);
     }
 }

lyra-game/src/lib.rs

@@ -1,5 +1,4 @@
 #![feature(hash_extract_if)]
-#![feature(lint_reasons)]
 #![feature(trait_alias)]
 #![feature(map_many_mut)]
 
@@ -14,8 +13,8 @@ pub mod as_any;
 pub mod plugin;
 pub mod change_tracker;
 
-pub mod events;
+mod event;
-pub use events::*;
+pub use event::*;
 
 pub mod stage;
 pub use stage::*;

lyra-game/src/plugin.rs

@@ -3,7 +3,6 @@ use lyra_resource::ResourceManager;
 
 use crate::game::App;
 use crate::winit::WinitPlugin;
-use crate::EventsPlugin;
 use crate::DeltaTimePlugin;
 use crate::input::InputPlugin;
 use crate::render::window::WindowPlugin;
@@ -113,7 +112,6 @@ impl Plugin for DefaultPlugins {
     fn setup(&mut self, app: &mut App) {
         WinitPlugin::default().setup(app);
         CommandQueuePlugin.setup(app);
-        EventsPlugin.setup(app);
         InputPlugin.setup(app);
         ResourceManagerPlugin.setup(app);
         WindowPlugin::default().setup(app);

lyra-game/src/render/window.rs

@@ -1,13 +1,13 @@
 use std::ops::{Deref, DerefMut};
 
-use lyra_ecs::{query::{filter::Changed, Entities, ResMut}, Component, World};
+use lyra_ecs::{query::{filter::Changed, Entities, Res, View}, Component};
 use lyra_resource::Image;
 use tracing::error;
 use winit::window::{CustomCursor, Fullscreen, Window};
 
 pub use winit::window::{CursorGrabMode, CursorIcon, Icon, Theme, WindowButtons, WindowLevel};
 
-use crate::{change_tracker::Ct, plugin::Plugin, winit::WinitWindows};
+use crate::{plugin::Plugin, winit::WinitWindows};
 
 #[derive(Default, Clone, Copy, PartialEq)]
 pub struct Area {
@@ -485,8 +485,12 @@ impl WindowOptions {
     }
 }
 
+/// The state of the window last time it was changed.
+/// 
+/// This is used in [`window_sync_system`] to see what fields of [`WindowOptions`] changed
+/// when syncing the winit window with the component.
 #[derive(Clone, Component)]
-struct LastWindow {
+pub struct LastWindow {
     last: WindowOptions,
 }
 
@@ -511,8 +515,8 @@ pub struct WindowPlugin {
 }
 
 /// A system that syncs Winit Windows with [`WindowOptions`] components.
-pub fn window_sync_system(world: &mut World) -> anyhow::Result<()> {
+pub fn window_sync_system(windows: Res<WinitWindows>, view: View<(Entities, &WindowOptions, &mut LastWindow), Changed<WindowOptions>>) -> anyhow::Result<()> {
-    for (entity, opts, mut last, windows) in world.filtered_view_iter::<(Entities, &WindowOptions, &mut LastWindow, ResMut<WinitWindows>), Changed<WindowOptions>>() {
+    for (entity, opts, mut last) in view.iter() {
         let window = windows.get_entity_window(entity)
             .expect("entity's window is missing");
 
@@ -644,9 +648,6 @@ pub fn window_sync_system(world: &mut World) -> anyhow::Result<()> {
 
 impl Plugin for WindowPlugin {
     fn setup(&mut self, app: &mut crate::game::App) {
-        let window_options = WindowOptions::default();
-
-        app.world.add_resource(Ct::new(window_options));
         app.with_system("window_sync", window_sync_system, &[]);
     }
 }

lyra-game/src/winit/mod.rs

@@ -4,10 +4,30 @@ use async_std::task::block_on;
 use glam::IVec2;
 use lyra_ecs::Entity;
 use rustc_hash::FxHashMap;
-use tracing::{debug, error, info, warn};
+use tracing::{debug, error, warn};
-use winit::{application::ApplicationHandler, event::WindowEvent, event_loop::{ActiveEventLoop, EventLoop}, window::{Window, WindowAttributes, WindowId}};
+use winit::{
+    application::ApplicationHandler,
+    event::WindowEvent,
+    event_loop::{ActiveEventLoop, EventLoop},
+    window::{Window, WindowAttributes, WindowId},
+};
 
-use crate::{game::{App, WindowState}, input::InputEvent, plugin::Plugin, render::{renderer::BasicRenderer, window::{PrimaryWindow, Size, WindowOptions}}, EventQueue};
+use crate::{
+    game::{App, WindowState},
+    plugin::Plugin,
+    render::{
+        renderer::BasicRenderer,
+        window::{PrimaryWindow, Size, WindowOptions},
+    },
+};
+
+/// A struct that contains a [`DeviceEvent`](winit::event::DeviceEvent) with its source
+/// [`DeviceId`](winit::event::DeviceId).
+#[derive(Debug, Clone)]
+pub struct DeviceEventPair {
+    pub device_src: winit::event::DeviceId,
+    pub event: winit::event::DeviceEvent,
+}
 
 pub struct WinitPlugin {
     /// The primary window that will be created.
@@ -20,13 +40,17 @@ pub struct WinitPlugin {
 
 impl Default for WinitPlugin {
     fn default() -> Self {
-        Self { primary_window: Some(WindowOptions::default()) }
+        Self {
+            primary_window: Some(WindowOptions::default()),
+        }
     }
 }
 
 impl Plugin for WinitPlugin {
     fn setup(&mut self, app: &mut crate::game::App) {
         app.set_run_fn(winit_app_runner);
+        app.register_event::<WindowEvent>();
+        app.register_event::<DeviceEventPair>();
 
         if let Some(prim) = self.primary_window.take() {
             app.add_resource(WinitWindows::with_window(prim));
@@ -39,13 +63,9 @@ impl Plugin for WinitPlugin {
         true
     }
 
-    fn complete(&self, _app: &mut crate::game::App) {
+    fn complete(&self, _app: &mut crate::game::App) {}
 
-    }
+    fn cleanup(&self, _app: &mut crate::game::App) {}
-    
-    fn cleanup(&self, _app: &mut crate::game::App) {
-    
-    }
 }
 
 #[derive(Default)]
@@ -65,7 +85,12 @@ impl WinitWindows {
         }
     }
 
-    pub fn create_window(&mut self, event_loop: &ActiveEventLoop, entity: Entity, attr: WindowAttributes) -> Result<WindowId, winit::error::OsError> {
+    pub fn create_window(
+        &mut self,
+        event_loop: &ActiveEventLoop,
+        entity: Entity,
+        attr: WindowAttributes,
+    ) -> Result<WindowId, winit::error::OsError> {
         let win = event_loop.create_window(attr)?;
         let id = win.id();
 
@@ -77,37 +102,34 @@ impl WinitWindows {
     }
 
     pub fn get_entity_window(&self, entity: Entity) -> Option<&Arc<Window>> {
-        self.entity_to_window.get(&entity)
+        self.entity_to_window
+            .get(&entity)
             .and_then(|id| self.windows.get(id))
     }
 }
 
 pub fn winit_app_runner(app: App) {
-    let evloop = EventLoop::new()
+    let evloop = EventLoop::new().expect("failed to create winit EventLoop");
-        .expect("failed to create winit EventLoop");
 
-    let mut winit_runner = WinitRunner {
+    let mut winit_runner = WinitRunner { app };
-        app,
+    evloop.run_app(&mut winit_runner).expect("loop error");
-    };
-    evloop.run_app(&mut winit_runner)
-        .expect("loop error");
 }
 
 struct WinitRunner {
-    app: App
+    app: App,
 }
 
 impl ApplicationHandler for WinitRunner {
     fn about_to_wait(&mut self, event_loop: &winit::event_loop::ActiveEventLoop) {
         self.app.update();
 
-        let renderer = self.app.renderer.get_mut().expect("renderer was not initialized");
+        let renderer = self
+            .app
+            .renderer
+            .get_mut()
+            .expect("renderer was not initialized");
         renderer.prepare(&mut self.app.world);
 
-        if let Some(mut event_queue) = self.app.world.try_get_resource_mut::<EventQueue>() {
-            event_queue.update_events();
-        }
-
         match renderer.render() {
             Ok(_) => {}
             // Reconfigure the surface if lost
@@ -149,86 +171,107 @@ impl ApplicationHandler for WinitRunner {
         }
     }
 
+    fn device_event(
+        &mut self,
+        _: &ActiveEventLoop,
+        device_src: winit::event::DeviceId,
+        event: winit::event::DeviceEvent,
+    ) {
+        self.app.push_event(DeviceEventPair { device_src, event });
+    }
+
     fn window_event(
         &mut self,
         event_loop: &winit::event_loop::ActiveEventLoop,
         window_id: winit::window::WindowId,
         event: WindowEvent,
     ) {
-        let windows = self.app.world.get_resource::<WinitWindows>();
+        /* let windows = self.app.world.get_resource::<WinitWindows>();
         let window = match windows.windows.get(&window_id) {
             Some(w) => w.clone(),
             None => return,
         };
-        drop(windows);
+        drop(windows); */
-
-        // If try_from failed, that means that the WindowEvent is not an
-        // input related event.
-        if let Some(input_ev) = InputEvent::from_window_event(&event) {
-            // Its possible to receive multiple input events before the update event for
-            // the InputSystem is called, so we must use a queue for the events.
-            if let Some(mut event_queue) = self.app.world.try_get_resource_mut::<EventQueue>() {
-                event_queue.trigger_event(input_ev.clone());
-            }
-        } else {
 
+        self.app.push_event(event.clone());
         match event {
-                WindowEvent::ActivationTokenDone { serial, token } => todo!(),
+            WindowEvent::ActivationTokenDone { .. } => todo!(),
             WindowEvent::Resized(physical_size) => {
                 self.app.on_resize(physical_size);
 
-                    let mut window_opts = self.app.world.get_resource::<WinitWindows>()
+                let mut window_opts = self
-                        .window_to_entity.get(&window_id)
+                    .app
+                    .world
+                    .get_resource::<WinitWindows>()
+                    .window_to_entity
+                    .get(&window_id)
                     .and_then(|e| self.app.world.view_one::<&mut WindowOptions>(*e).get())
                     .unwrap();
                 window_opts.size = Size::new_physical(physical_size.width, physical_size.height);
-                },
+            }
             WindowEvent::Moved(physical_position) => {
                 let mut state = self.app.world.get_resource_or_else(WindowState::new);
                 state.position = IVec2::new(physical_position.x, physical_position.y);
-                },
+            }
             WindowEvent::CloseRequested => {
                 self.app.on_exit();
                 event_loop.exit();
-                },
+            }
             WindowEvent::Destroyed => todo!(),
-                WindowEvent::DroppedFile(path_buf) => todo!(),
+            WindowEvent::DroppedFile(_path_buf) => todo!(),
-                WindowEvent::HoveredFile(path_buf) => todo!(),
+            WindowEvent::HoveredFile(_path_buf) => todo!(),
             WindowEvent::HoveredFileCancelled => todo!(),
             WindowEvent::Focused(focused) => {
-                    let mut window_opts = self.app.world.get_resource::<WinitWindows>()
+                let mut window_opts = self
-                        .window_to_entity.get(&window_id)
+                    .app
+                    .world
+                    .get_resource::<WinitWindows>()
+                    .window_to_entity
+                    .get(&window_id)
                     .and_then(|e| self.app.world.view_one::<&mut WindowOptions>(*e).get())
                     .unwrap();
                 window_opts.focused = focused;
-                },
+            }
-                WindowEvent::ModifiersChanged(modifiers) => debug!("modifiers changed: {:?}", modifiers),
+            WindowEvent::ModifiersChanged(modifiers) => {
+                debug!("modifiers changed: {:?}", modifiers)
+            }
             WindowEvent::ScaleFactorChanged { scale_factor, .. } => {
-                    let mut window_opts = self.app.world.get_resource::<WinitWindows>()
+                let mut window_opts = self
-                        .window_to_entity.get(&window_id)
+                    .app
+                    .world
+                    .get_resource::<WinitWindows>()
+                    .window_to_entity
+                    .get(&window_id)
                     .and_then(|e| self.app.world.view_one::<&mut WindowOptions>(*e).get())
                     .unwrap();
                 window_opts.scale_factor = scale_factor;
-                },
+            }
             WindowEvent::ThemeChanged(theme) => {
-                    let mut window_opts = self.app.world.get_resource::<WinitWindows>()
+                let mut window_opts = self
-                        .window_to_entity.get(&window_id)
+                    .app
+                    .world
+                    .get_resource::<WinitWindows>()
+                    .window_to_entity
+                    .get(&window_id)
                     .and_then(|e| self.app.world.view_one::<&mut WindowOptions>(*e).get())
                     .unwrap();
                 window_opts.theme = Some(theme);
-                },
+            }
             WindowEvent::Occluded(occ) => {
-                    let mut window_opts = self.app.world.get_resource::<WinitWindows>()
+                let mut window_opts = self
-                        .window_to_entity.get(&window_id)
+                    .app
+                    .world
+                    .get_resource::<WinitWindows>()
+                    .window_to_entity
+                    .get(&window_id)
                     .and_then(|e| self.app.world.view_one::<&mut WindowOptions>(*e).get())
                     .unwrap();
                 window_opts.occluded = occ;
-                },
+            }
             WindowEvent::RedrawRequested => {
                 //debug!("should redraw");
-                },
+            }
             _ => {}
         }
     }
 }
-}