Fix Changed<T> by rewriting ecs `Filter`s, position `TileMapPos` entities with ChildOf relations

crates/lyra-ecs/src/archetype.rs

@@ -56,12 +56,15 @@ impl ComponentColumn {
     pub unsafe fn new(info: ComponentInfo, capacity: usize) -> Self {
         let data = ComponentColumn::alloc(info.layout(), capacity);
 
+        let mut ticks = Vec::with_capacity(capacity);
+        ticks.resize(capacity, Tick::from(0));
+
         Self {
             data: RefCell::new(data),
             capacity,
             info,
             len: 0,
-            entity_ticks: Vec::new(),
+            entity_ticks: ticks,
         }
     }
 
@@ -99,9 +102,7 @@ impl ComponentColumn {
         let dest = NonNull::new_unchecked(data.as_ptr().add(entity_index * size));
         ptr::copy_nonoverlapping(comp_src.as_ptr(), dest.as_ptr(), size);
 
-        // check if a component spot is being set twice and that the entity's tick is
-        // already stored
-        self.entity_ticks.push(tick);
+        self.entity_ticks[entity_index] = tick;
         self.len += 1;
     }
 
@@ -175,6 +176,7 @@ impl ComponentColumn {
             *data = new_ptr;
         }
 
+        self.entity_ticks.resize(new_capacity, Tick::from(0));
         self.capacity = new_capacity;
     }
 

crates/lyra-ecs/src/bundle.rs

@@ -272,11 +272,11 @@ mod tests {
         let mut world = World::new();
         let e = world.spawn(b);
 
-        let pos = world.view_one::<&Vec2>(e).get()
+        let pos = world.view_one::<&Vec2>(e)
             .expect("failed to find spawned Vec2 from Bundle on Entity");
         assert!(pos.x == b_pos.x && pos.y == b_pos.y, "Spawned Vec2 values were not correct, got: {:?}, expected: {:?}", *pos, b_pos);
         
-        let flag = world.view_one::<&SomeFlag>(e).get()
+        let flag = world.view_one::<&SomeFlag>(e)
             .expect("failed to find spawned SomeFlag from Bundle on Entity");
         assert_eq!(*flag, b_flag);
     }

crates/lyra-ecs/src/command.rs

@@ -1,6 +1,6 @@
 use std::{any::Any, cell::RefMut, mem::{self, MaybeUninit}, ptr::{self, NonNull}};
 
-use crate::{system::FnArgFetcher, Access, Bundle, Entities, Entity, World};
+use crate::{system::FnArgFetcher, Access, Bundle, Entities, Entity, Relation, World};
 
 /// A Command be used to delay mutation of the world until after this system is ran.
 pub trait Command: Any {
@@ -175,6 +175,12 @@ impl<'a, 'b> Commands<'a, 'b> {
         });
     }
 
+    pub fn add_relation<R: Relation>(&mut self, origin: Entity, relation: R, target: Entity){
+        self.add(move | world: &mut World| {
+            world.add_relation(origin, relation, target);
+        });
+    }
+
     /// Execute all commands in the queue, in order of insertion
     pub fn execute(&mut self, world: &mut World) {
         self.queue.execute(Some(world));

crates/lyra-ecs/src/query/filter/changed.rs

@@ -1,6 +1,6 @@
 use std::marker::PhantomData;
 
-use crate::{query::{AsFilter, AsQuery, Fetch, Filter, Query}, Component, ComponentColumn, DynTypeId, Tick, World};
+use crate::{query::{AsQuery, Fetch, Query}, Component, ComponentColumn, DynTypeId, Tick, World};
 
 pub struct ChangedFetcher<'a, T> {
     col: &'a ComponentColumn,
@@ -20,7 +20,10 @@ where
 
     unsafe fn get_item(&mut self, entity: crate::world::ArchetypeEntityId) -> Self::Item {
         let tick = self.col.entity_ticks[entity.0 as usize];
-        *tick >= (*self.tick) - 1
+        if *tick > 50 {
+            //debug!("tick: {}, world tick: {}", *tick, *self.tick);
+        }
+        *tick >= *self.tick
     }
 }
 
@@ -77,10 +80,10 @@ where
         archetype.has_column(self.type_id)
     }
 
-    unsafe fn fetch<'a>(&self, w: &'a World, a: &'a crate::archetype::Archetype, _: crate::Tick) -> Self::Fetch<'a> {
+    unsafe fn fetch<'a>(&self, _: &'a World, a: &'a crate::archetype::Archetype, tick: crate::Tick) -> Self::Fetch<'a> {
         ChangedFetcher {
             col: a.get_column(self.type_id).unwrap(),
-            tick: w.current_tick(),
+            tick,
             _phantom: PhantomData::<&T>,
         }
     }
@@ -89,9 +92,3 @@ where
 impl<T: Component> AsQuery for Changed<T> {
     type Query = Self;
 }
-
-impl<T: Component> Filter for Changed<T> { }
-
-impl<T: Component> AsFilter for Changed<T> {
-    type Filter = Self;
-}

crates/lyra-ecs/src/query/filter/has.rs

@@ -1,6 +1,6 @@
 use std::marker::PhantomData;
 
-use crate::{query::{AsFilter, AsQuery, Filter, Query}, Archetype, Component, DynTypeId, World};
+use crate::{query::{AsQuery, Query}, Archetype, Component, DynTypeId, World};
 
 use super::StaticFetcher;
 
@@ -45,8 +45,8 @@ impl<C: Component> AsQuery for Has<C> {
     type Query = Self;
 }
 
-impl<C: Component> Filter for Has<C> { }
+//impl<C: Component> Filter for Has<C> { }
 
-impl<C: Component> AsFilter for Has<C> {
+/* impl<C: Component> AsFilter for Has<C> {
     type Filter = Self;
-}
+} */

crates/lyra-ecs/src/query/filter/mod.rs

@@ -10,7 +10,73 @@ pub use not::*;
 mod changed;
 pub use changed::*;
 
-use super::Fetch;
+use crate::{Archetype, ArchetypeEntityId, Tick, World};
+
+use super::{Fetch, Query};
+
+pub trait FilterFetch<'a> {
+    /// Returns true if the entity should be visited or skipped.
+    fn can_visit(&mut self, entity: ArchetypeEntityId) -> bool;
+}
+
+pub trait Filter: Copy {
+    /// The fetcher used for the filter
+    type Fetch<'a>: FilterFetch<'a>;
+
+    fn new() -> Self;
+
+    /// Returns true if the archetype should be visited or skipped.
+    fn can_visit_archetype(&self, archetype: &Archetype) -> bool;
+
+    unsafe fn fetch<'a>(&self, world: &'a World, archetype: &'a Archetype, tick: Tick) -> Self::Fetch<'a>;
+
+    /// Returns a fetcher that doesn't fetch from an archetype.
+    unsafe fn fetch_world<'a>(&self, world: &'a World) -> Option<Self::Fetch<'a>> {
+        let _ = world;
+        None
+    }
+}
+
+/// A trait for getting the filter of a type.
+pub trait AsFilter {
+    /// The query for this type
+    type Filter: Filter;
+}
+
+impl<Q> Filter for Q
+where 
+    Q: for <'a> Query<Item<'a> = bool>,
+{
+    type Fetch<'a> = Q::Fetch<'a>;
+
+    fn new() -> Self {
+        Query::new()
+    }
+
+    fn can_visit_archetype(&self, archetype: &Archetype) -> bool {
+        Query::can_visit_archetype(self, archetype)
+    }
+
+    unsafe fn fetch<'a>(&self, world: &'a World, archetype: &'a Archetype, tick: Tick) -> Self::Fetch<'a> {
+        Query::fetch(self, world, archetype, tick)
+    }
+}
+
+impl<'a, F> FilterFetch<'a> for F
+where
+    F: Fetch<'a, Item = bool>
+{
+    fn can_visit(&mut self, entity: ArchetypeEntityId) -> bool {
+        Fetch::can_visit_item(self, entity) && unsafe { Fetch::get_item(self, entity) }
+    }
+}
+
+impl<Q> AsFilter for Q
+where 
+    Q: for <'a> Query<Item<'a> = bool>
+{
+    type Filter = Q;
+}
 
 /// A fetcher that just returns a provided value
 pub struct StaticFetcher<T: Clone> {

crates/lyra-ecs/src/query/filter/not.rs

@@ -1,4 +1,4 @@
-use crate::{query::{AsFilter, AsQuery, Filter, Query}, Archetype, World};
+use crate::{query::{AsQuery, Query}, Archetype, World};
 
 use super::StaticFetcher;
 
@@ -44,9 +44,3 @@ impl<Q: Query> Query for Not<Q> {
 impl<Q: Query> AsQuery for Not<Q> {
     type Query = Self;
 }
-
-impl<Q: Query> Filter for Not<Q> { }
-
-impl<Q: Query> AsFilter for Not<Q> {
-    type Filter = Self;
-}

crates/lyra-ecs/src/query/mod.rs

@@ -38,6 +38,7 @@ pub use world_tick::*;
 pub mod dynamic;
 
 pub mod filter;
+pub use filter::{Filter, AsFilter};
 
 /// A [`Fetch`]er implementation gets data out of an archetype.
 pub trait Fetch<'a> {
@@ -93,30 +94,24 @@ pub trait AsQuery {
     type Query: Query;
 }
 
-/// A trait for getting the filter of a type.
-pub trait AsFilter {
-    /// The query for this type
-    type Filter: Filter;
-}
-
 pub trait IntoQuery {
     fn into_query(self) -> Self;
 }
 
 impl<'a> Fetch<'a> for () {
-    type Item = ();
+    type Item = bool;
 
     fn dangling() -> Self {
         unreachable!()
     }
 
     unsafe fn get_item(&mut self, _: ArchetypeEntityId) -> Self::Item {
-        ()
+        true
     }
 }
 
 impl Query for () {
-    type Item<'a> = ();
+    type Item<'a> = bool;
 
     type Fetch<'a> = ();
 
@@ -135,22 +130,10 @@ impl Query for () {
     }
 }
 
-impl Filter for () {
-    type Item<'a> = bool;
-}
-
 impl AsQuery for () {
     type Query = ();
 }
 
-pub trait Filter: Query {
-    type Item<'a> = bool;
-}
-
-impl AsFilter for () {
-    type Filter = ();
-}
-
 #[cfg(test)]
 mod tests {
     use crate::{World, archetype::Archetype, tests::Vec2};

crates/lyra-ecs/src/query/tuple.rs

@@ -1,6 +1,6 @@
 use crate::World;
 
-use super::{Query, Fetch, AsQuery, Filter, AsFilter};
+use super::{Query, Fetch, AsQuery, Filter, AsFilter, filter::FilterFetch, ArchetypeEntityId};
 
 /* impl<'a, F1> Fetch<'a> for (F1,)
 where
@@ -139,10 +139,7 @@ macro_rules! impl_bundle_tuple {
 
             fn can_visit_archetype(&self, archetype: &crate::archetype::Archetype) -> bool {
                 let ( $($name,)+ ) = self;
-
-                // this is the only way I could figure out how to do an 'and'
-                let bools = vec![$($name.can_visit_archetype(archetype),)+];
-                bools.iter().all(|b| *b)
+                $($name.can_visit_archetype(archetype)) &&+
             }
 
             unsafe fn fetch<'a>(&self, world: &'a World, archetype: &'a crate::archetype::Archetype, tick: crate::Tick) -> Self::Fetch<'a> {
@@ -156,26 +153,30 @@ macro_rules! impl_bundle_tuple {
         }
 
         #[allow(non_snake_case)]
-        impl<$($name: Filter),+> Filter for ($($name,)+) {
-            //type Item<'a> = ($(<$name as Query>::Item<'a>,)+);
-            //type Fetch<'a> = ($(<$name as Query>::Fetch<'a>,)+);
+        impl<'a, $($name: FilterFetch<'a>),+> FilterFetch<'a> for ($($name,)+) {
+            fn can_visit(&mut self, entity: ArchetypeEntityId) -> bool {
+                let ( $($name,)+ ) = self;
+                $($name.can_visit(entity)) &&+
+            }
+        }
 
-            /* fn new() -> Self {
+        #[allow(non_snake_case)]
+        impl<$($name: Filter),+> Filter for ($($name,)+) {
+            type Fetch<'a> = ($(<$name as Filter>::Fetch<'a>,)+);
+
+            fn new() -> Self {
                 ( $($name::new(),)+ )
             }
 
             fn can_visit_archetype(&self, archetype: &crate::archetype::Archetype) -> bool {
                 let ( $($name,)+ ) = self;
-
-                // this is the only way I could figure out how to do an 'and'
-                let bools = vec![$($name.can_visit_archetype(archetype),)+];
-                bools.iter().all(|b| *b)
+                $($name.can_visit_archetype(archetype)) &&+
             }
 
             unsafe fn fetch<'a>(&self, world: &'a World, archetype: &'a crate::archetype::Archetype, tick: crate::Tick) -> Self::Fetch<'a> {
                 let ( $($name,)+ ) = self;
                 ( $($name.fetch(world, archetype, tick),)+ )
-            } */
+            }
         }
 
         impl<$($name: AsFilter),+> AsFilter for ($($name,)+) {

crates/lyra-ecs/src/query/view.rs

@@ -1,8 +1,8 @@
-use std::ops::Range;
+use std::{ops::Range, ptr::NonNull};
 
-use crate::{archetype::Archetype, world::{ArchetypeEntityId, World}, EntityId, Tick};
+use crate::{archetype::Archetype, system::FnArgFetcher, world::{ArchetypeEntityId, World}, Entity, Tick};
 
-use super::{AsFilter, AsQuery, Fetch, Filter, Query};
+use super::{filter::{AsFilter, Filter, FilterFetch}, AsQuery, Fetch, Query};
 
 pub type View<'a, Q, F = ()> = ViewState<'a, <Q as AsQuery>::Query, <F as AsQuery>::Query>;
 
@@ -109,7 +109,7 @@ where
                 let filter_fetcher = self.filter_fetcher.as_mut().unwrap();
                 let entity_index = ArchetypeEntityId(entity_index);
 
-                if fetcher.can_visit_item(entity_index) && filter_fetcher.can_visit_item(entity_index) {
+                if fetcher.can_visit_item(entity_index) && filter_fetcher.can_visit(entity_index) {
                     let i = unsafe { fetcher.get_item(entity_index) };
                     return Some(i);
                 }
@@ -138,27 +138,27 @@ where
     }
 }
 
-pub struct ViewOne<'a, Q: Query> {
+pub type ViewOne<'a, Q> = ViewOneState<'a, <Q as AsQuery>::Query>;
+
+pub struct ViewOneState<'a, Q: Query> {
     world: &'a World,
     tick: Tick,
-    entity: EntityId,
     query: Q,
 }
 
-impl<'a, Q: Query> ViewOne<'a, Q> {
-    pub fn new(world: &'a World, entity: EntityId, query: Q) -> Self {
+impl<'a, Q: Query> ViewOneState<'a, Q> {
+    pub fn new(world: &'a World, query: Q) -> Self {
         //let tick = world.tick_tracker().tick_when(Q::MUTATES);
 
         Self {
             world,
             tick: world.current_tick(),
-            entity,
             query
         }
     }
 
-    pub fn get(self) -> Option<Q::Item<'a>> {
-        if let Some(record) = self.world.entities.arch_index.get(&self.entity) {
+    pub fn get(&self, entity: Entity) -> Option<Q::Item<'a>> {
+        if let Some(record) = self.world.entities.arch_index.get(&entity.id()) {
             let arch = self.world.archetypes.get(&record.id)
                 .expect("An invalid record was specified for an entity");
 
@@ -173,3 +173,17 @@ impl<'a, Q: Query> ViewOne<'a, Q> {
         None
     }
 }
+
+impl<Q: Query> FnArgFetcher for ViewOneState<'_, Q> {
+    type State = ();
+    type Arg<'a, 'state> = ViewOneState<'a, Q>;
+
+    unsafe fn get<'a, 'state>(_: &'state mut Self::State, world: NonNull<World>) -> Self::Arg<'a, 'state> {
+        let world = world.as_ref();
+        ViewOneState::<Q>::new(world, Q::new())
+    }
+
+    fn apply_deferred(_: Self::State, _: NonNull<World>) { }
+    
+    fn create_state(_: NonNull<World>) -> Self::State { () }
+}

crates/lyra-ecs/src/world.rs

@@ -2,7 +2,7 @@ use std::{any::TypeId, collections::HashMap, ops::Deref, ptr::NonNull};
 
 use atomic_refcell::{AtomicRef, AtomicRefMut};
 
-use crate::{archetype::{Archetype, ArchetypeId}, bundle::Bundle, query::{dynamic::DynamicView, AsFilter, AsQuery, Query, Res, ResMut, ViewIter, ViewOne, ViewState}, resource::ResourceData, ComponentInfo, DynTypeId, DynamicBundle, Entities, Entity, ResourceObject, Tick, TickTracker, TrackedResource};
+use crate::{archetype::{Archetype, ArchetypeId}, bundle::Bundle, query::{dynamic::DynamicView, Filter, AsFilter, AsQuery, Query, Res, ResMut, ViewIter, ViewOneState, ViewState}, resource::ResourceData, ComponentInfo, DynTypeId, DynamicBundle, Entities, Entity, ResourceObject, Tick, TickTracker, TrackedResource};
 
 /// The id of the entity for the Archetype.
 /// 
@@ -397,8 +397,8 @@ impl World {
         DynamicView::new(self)
     }
 
-    pub fn view_one<T: AsQuery>(&self, entity: Entity) -> ViewOne<T::Query> {
-        ViewOne::new(self, entity.id, T::Query::new())
+    pub fn view_one<T: AsQuery>(&self, entity: Entity) -> Option<<T::Query as Query>::Item<'_>> {
+        ViewOneState::<T::Query>::new(self, T::Query::new()).get(entity)
     }
 
     /// Add a resource to the world.
@@ -688,7 +688,7 @@ mod tests {
 
         world.insert(e, (Vec3::rand(),));
 
-        assert!(world.view_one::<&Vec3>(e).get().is_some())
+        assert!(world.view_one::<&Vec3>(e).is_some())
     }
 
     #[test]
@@ -698,7 +698,7 @@ mod tests {
 
         world.insert(e, (Vec3::rand(),));
 
-        assert!(world.view_one::<&Vec3>(e).get().is_some())
+        assert!(world.view_one::<&Vec3>(e).is_some())
     }
 
     #[test]
@@ -712,7 +712,7 @@ mod tests {
         let e3 = world.spawn(v2s[2]);
         println!("Spawned entities");
 
-        let ev2 = world.view_one::<&Vec2>(e2).get()
+        let ev2 = world.view_one::<&Vec2>(e2)
             .expect("Failed to find Vec2 and Vec3 on inserted entity!");
         assert_eq!(*ev2, v2s[1]);
         drop(ev2);
@@ -722,7 +722,7 @@ mod tests {
             world.insert(e, (v3,));
             println!("inserted entity");
 
-            let (ev2, ev3) = world.view_one::<(&Vec2, &Vec3)>(e).get()
+            let (ev2, ev3) = world.view_one::<(&Vec2, &Vec3)>(e)
                 .expect("Failed to find Vec2 and Vec3 on inserted entity!");
             assert_eq!(*ev2, v2);
             assert_eq!(*ev3, v3);
@@ -747,7 +747,7 @@ mod tests {
         let e = world.spawn((v,));
 
         let view = world.view_one::<&Vec2>(e);
-        assert_eq!(*view.get().unwrap(), v);
+        assert_eq!(*view.unwrap(), v);
     }
 
     #[test]
@@ -782,11 +782,11 @@ mod tests {
 
         world.insert(first, Vec2::new(50.0, 50.0));
 
-        let pos = world.view_one::<&mut Vec2>(first).get().unwrap();
+        let pos = world.view_one::<&mut Vec2>(first).unwrap();
         assert_eq!(*pos, Vec2::new(50.0, 50.0));
         drop(pos);
 
-        let pos = world.view_one::<&mut Vec2>(second).get().unwrap();
+        let pos = world.view_one::<&mut Vec2>(second).unwrap();
         assert_eq!(*pos, Vec2::new(5.0, 5.0));
     }
 

crates/lyra-game/src/render/graph/passes/transform.rs

@@ -43,8 +43,6 @@ impl TransformsNode {
 
 fn process_component_queue(world: &mut lyra_ecs::World, component_queue: Vec<(Entity, Option<InterpTransform>, Option<TransformIndex>)>) {
     for (en, interp, index) in component_queue {
-        println!("writing index {:?} for entity {}", index, en.id().0);
-
         match (interp, index) {
             (None, None) => unreachable!(),
             (None, Some(index)) => world.insert(en, index),
@@ -94,7 +92,7 @@ fn update_transforms(
         // Interpolate the transform for this entity using a component.
         // If the entity does not have the component then it will be queued to be added
         // to it after all the entities are prepared for rendering.
-        let transform = match interp_tran {
+        /* let transform = match interp_tran {
             Some(mut interp_transform) => {
                 // found in https://youtu.be/YJB1QnEmlTs?t=472
                 interp_transform.alpha = 1.0 - interp_transform.alpha.powf(*delta_time);
@@ -112,6 +110,21 @@ fn update_transforms(
                 component_queue.push((entity, Some(interp), None));
                 transform
             }
+        }; */
+
+        let transform = match interp_tran {
+            Some(mut interp_transform) => {
+                interp_transform.last_transform = transform;
+                transform
+            }
+            None => {
+                let interp = InterpTransform {
+                    last_transform: transform,
+                    alpha: 1.0,
+                };
+                component_queue.push((entity, Some(interp), None));
+                transform
+            }
         };
 
         // Get the TransformIndex from the entity, or reserve a new one if the entity doesn't have
@@ -120,11 +133,6 @@ fn update_transforms(
             Some(i) => *i,
             None => {
                 let i = buffers.reserve_transform(&device);
-                debug!(
-                    "Reserved transform index {:?} for entity {}",
-                    i,
-                    entity.id().0
-                );
 
                 component_queue.push((entity, None, Some(i)));
                 i

crates/lyra-game/src/sprite/tilemap.rs

@@ -1,24 +1,25 @@
-use std::collections::VecDeque;
-
 use glam::{UVec2, UVec3, Vec2, Vec3};
 use lyra_ecs::{
-    query::{Entities, View},
-    relation::ChildOf,
-    Commands, Component, Entity, World,
+    query::{
+        filter::{Changed, Has, Not},
+        Entities, View, ViewOne,
+    },
+    relation::{ChildOf, RelationOriginComponent},
+    Commands, Component, Entity,
 };
 use lyra_math::Transform;
 use lyra_reflect::Reflect;
 use lyra_resource::ResHandle;
 use lyra_scene::WorldTransform;
-use tracing::{debug, error};
+use tracing::error;
 
 use crate::{game::GameStages, plugin::Plugin};
 
 use super::{AtlasSprite, TextureAtlas};
 
-/// A position relative to a tile on a tilemap
+/// A position on a tile map
 #[derive(Clone, Copy, Component, Reflect)]
-pub struct RelativeToTile {
+pub struct TileMapPos {
     #[reflect(skip)] // TODO: impl reflect for Entity
     pub tilemap_entity: Entity,
     /// The position of the tile to spawn at.
@@ -107,9 +108,9 @@ impl TileMap {
 /// A system to update the tilemap when tiles are inserted/removed.
 pub fn system_tilemap_update(
     mut commands: Commands,
-    view: View<(&mut TileMap, &Transform)>,
+    view: View<(Entities, &mut TileMap)>,
 ) -> anyhow::Result<()> {
-    for (mut map, pos) in view.into_iter() {
+    for (map_en, mut map) in view.into_iter() {
         let tile_size = map.tile_size;
         let atlas_handle = map.atlas.clone();
         let atlas = match atlas_handle.data_ref() {
@@ -128,15 +129,32 @@ pub fn system_tilemap_update(
                         };
 
                         let grid = tile.tile.position * tile_size;
-                        let sprite_pos = *pos
-                            + Transform::from_xyz(
-                                grid.x as _,
-                                grid.y as _,
-                                tile.tile.z_level as _,
-                            );
+                        let sprite_pos = Transform::from_xyz(
+                            grid.x as _,
+                            // expand the grid downwards so 0,0 is top left of the tilemap
+                            -(grid.y as f32),
+                            tile.tile.z_level as _,
+                        );
 
-                        tile.entity = Some(commands.spawn((sprite, sprite_pos, WorldTransform::default())));
-                        debug!("Spawned tile at ({}, {})", grid.x, grid.y);
+                        let tile_en = commands.spawn((
+                            sprite,
+                            TileMapPos {
+                                tilemap_entity: map_en,
+                                position: tile.tile.position,
+                                z_level: tile.tile.z_level,
+                            },
+                            tile.tile,
+                            sprite_pos,
+                            WorldTransform::default(),
+                        ));
+                        commands.add_relation(tile_en, ChildOf, map_en);
+                        tile.entity = Some(tile_en);
+                        //debug!("Spawned tile at ({}, {})", grid.x, grid.y);
+
+                        /* let tile_en = commands.spawn((sprite, sprite_pos, WorldTransform::default()));
+                        commands.add_relation(tile_en, ChildOf, map_en);
+                        tile.entity = Some(tile_en);
+                        debug!("Spawned tile at ({}, {})", grid.x, grid.y); */
                     } else {
                         error!(
                             "Invalid atlas index '{}' for tile at pos '{:?}'",
@@ -152,17 +170,22 @@ pub fn system_tilemap_update(
 }
 
 fn system_relative_tile_position_update(
-    world: &mut World,
-    view: View<(Entities, &RelativeToTile)>,
+    mut commands: Commands,
+    view: View<
+        (
+            Entities,
+            &TileMapPos,
+            Option<&mut Transform>,
+            Option<&WorldTransform>,
+        ),
+        (Changed<TileMapPos>, Not<Has<Tile>>),
+    >,
+    tile_map_view: ViewOne<&TileMap>,
+    child_of_rel_view: ViewOne<&RelationOriginComponent<ChildOf>>,
 ) -> anyhow::Result<()> {
-    let mut to_relate = VecDeque::new();
-
-    for (en, rel) in view.into_iter() {
-        match world
-            .view_one::<(&TileMap, &Transform)>(rel.tilemap_entity)
-            .get()
-        {
-            Some((map, pos)) => {
+    for (en, rel, pos, wpos) in view.into_iter() {
+        match tile_map_view.get(rel.tilemap_entity) {
+            Some(map) => {
                 let layer = map.layers.last().unwrap();
 
                 if let Some(tile_en) = layer
@@ -171,7 +194,27 @@ fn system_relative_tile_position_update(
                     .find(|t| t.tile.position == rel.position)
                     .and_then(|t| t.entity)
                 {
-                    to_relate.push_back((en, tile_en, Transform::from_translation(Vec3::new(0.0, 0.0, rel.z_level as _))));
+                    if child_of_rel_view
+                        .get(en)
+                        .map(|rel| rel.target() != tile_en)
+                        .unwrap_or(true)
+                    {
+                        commands.add_relation(en, ChildOf, tile_en);
+                    }
+
+                    if let Some(mut pos) = pos {
+                        *pos = Transform::from_translation(Vec3::new(0.0, 0.0, rel.z_level as _));
+
+                        if wpos.is_none() {
+                            commands.insert(en, WorldTransform::from(*pos));
+                        }
+                    } else {
+                        let pos =
+                            Transform::from_translation(Vec3::new(0.0, 0.0, rel.z_level as _));
+                        commands.insert(en, (pos, WorldTransform::from(pos)));
+                    }
+                } else {
+                    error!("Unknown tile in map at {:?}", rel.position);
                 }
             }
             None => {
@@ -183,13 +226,6 @@ fn system_relative_tile_position_update(
         }
     }
 
-    while let Some((from, to, pos)) = to_relate.pop_front() {
-        if world.view_one::<&WorldTransform>(from).get().is_none() {
-            world.add_relation(from, ChildOf, to);
-            world.insert(from, (pos, WorldTransform::default()));
-        }
-    }
-
     Ok(())
 }
 

crates/lyra-game/src/winit/plugin.rs

@@ -226,7 +226,7 @@ impl ApplicationHandler for WinitRunner {
                     .expect("missing window entity");
 
                 // update the window and its cache so the sync system doesn't try to update the window
-                let (mut en_window, mut en_last_win) = self.app.world.view_one::<(&mut WindowOptions, &mut LastWindow)>(*en).get().unwrap();
+                let (mut en_window, mut en_last_win) = self.app.world.view_one::<(&mut WindowOptions, &mut LastWindow)>(*en).unwrap();
                 let pos = Some(DVec2::new(position.x, position.y));
                 en_window.set_physical_cursor_position(pos);
                 en_last_win.set_physical_cursor_position(pos);
@@ -242,7 +242,7 @@ impl ApplicationHandler for WinitRunner {
                     .expect("world missing WinitWindows resource")
                     .window_to_entity
                     .get(&window_id)
-                    .and_then(|e| self.app.world.view_one::<(&mut WindowOptions, &mut LastWindow)>(*e).get())
+                    .and_then(|e| self.app.world.view_one::<(&mut WindowOptions, &mut LastWindow)>(*e))
                     .unwrap();
 
                 // update the window and its cache so the sync system doesn't try to update the window
@@ -259,7 +259,7 @@ impl ApplicationHandler for WinitRunner {
                     .expect("world missing WinitWindows resource")
                     .window_to_entity
                     .get(&window_id)
-                    .and_then(|e| self.app.world.view_one::<(&mut WindowOptions, &mut LastWindow)>(*e).get())
+                    .and_then(|e| self.app.world.view_one::<(&mut WindowOptions, &mut LastWindow)>(*e))
                     .unwrap();
                 window.set_physical_cursor_position(None);
                 last_window.set_physical_cursor_position(None);
@@ -284,7 +284,7 @@ impl ApplicationHandler for WinitRunner {
                     .expect("world missing WinitWindows resource")
                     .window_to_entity
                     .get(&window_id)
-                    .and_then(|e| self.app.world.view_one::<&mut WindowOptions>(*e).get())
+                    .and_then(|e| self.app.world.view_one::<&mut WindowOptions>(*e))
                     .unwrap();
                 window_opts.focused = focused;
             },
@@ -299,7 +299,7 @@ impl ApplicationHandler for WinitRunner {
                     .expect("world missing WinitWindows resource")
                     .window_to_entity
                     .get(&window_id)
-                    .and_then(|e| self.app.world.view_one::<&mut WindowOptions>(*e).get())
+                    .and_then(|e| self.app.world.view_one::<&mut WindowOptions>(*e))
                     .unwrap();
                 window_opts.scale_factor = scale_factor;
             },
@@ -311,7 +311,7 @@ impl ApplicationHandler for WinitRunner {
                     .expect("world missing WinitWindows resource")
                     .window_to_entity
                     .get(&window_id)
-                    .and_then(|e| self.app.world.view_one::<&mut WindowOptions>(*e).get())
+                    .and_then(|e| self.app.world.view_one::<&mut WindowOptions>(*e))
                     .unwrap();
                 window_opts.theme = Some(theme);
             },
@@ -323,7 +323,7 @@ impl ApplicationHandler for WinitRunner {
                     .expect("world missing WinitWindows resource")
                     .window_to_entity
                     .get(&window_id)
-                    .and_then(|e| self.app.world.view_one::<&mut WindowOptions>(*e).get())
+                    .and_then(|e| self.app.world.view_one::<&mut WindowOptions>(*e))
                     .unwrap();
                 window_opts.occluded = occ;
             },

crates/lyra-gltf/src/loader.rs

@@ -224,7 +224,8 @@ impl ResourceLoader for GltfLoader {
                 }
 
                 for en in graph.world().view_iter::<query::Entities>() {
-                    graph.world().view_one::<(&WorldTransform, &Transform)>(en).get().expect("Scene node is missing world and local transform bundle!");
+                    graph.world().view_one::<(&WorldTransform, &Transform)>(en)
+                        .expect("Scene node is missing world and local transform bundle!");
                 }
 
                 let graph = ResHandle::new_ready(Some(path.as_str()), graph);
@@ -300,14 +301,14 @@ mod tests {
         let mut node = None;
         //scene.world().view::<SceneNodeFlag()
         scene.traverse_down::<_, &WorldTransform>(|_, no, tran| {
-            tran.get().expect("scene node is missing a WorldTransform");
+            tran.expect("scene node is missing a WorldTransform");
             node = Some(no.clone());
         });
 
         let world = scene.world();
         let node = node.unwrap();
         
-        let data = world.view_one::<(&ResHandle<Mesh>, &Transform)>(node.entity()).get();
+        let data = world.view_one::<(&ResHandle<Mesh>, &Transform)>(node.entity());
         debug_assert!(data.is_some(), "The mesh was not loaded"); // transform will always be there
         let data = data.unwrap();
 

crates/lyra-reflect/src/component.rs

@@ -73,17 +73,17 @@ impl<C: Component + Reflect> FromType<C> for ReflectedComponent {
             },
             fn_reflect: |world: &World, entity: Entity| {
                 world.view_one::<&C>(entity)
-                    .get().map(|c| c as Ref<dyn Reflect>)
+                    .map(|c| c as Ref<dyn Reflect>)
             },
             fn_reflect_mut: |world: &mut World, entity: Entity| {
                 world.view_one::<&mut C>(entity)
-                    .get().map(|c| c as RefMut<dyn Reflect>)
+                    .map(|c| c as RefMut<dyn Reflect>)
             },
             fn_reflect_tick: |world: &World, entity: Entity| {
-                world.view_one::<TickOf<C>>(entity).get()
+                world.view_one::<TickOf<C>>(entity)
             },
             fn_reflect_is_changed: |world: &World, entity: Entity| {
-                world.view_one::<Changed<C>>(entity).get()
+                world.view_one::<Changed<C>>(entity)
             }
         }
     }

crates/lyra-scene/src/lib.rs

@@ -6,7 +6,7 @@ pub use node::*;
 mod world_transform;
 pub use world_transform::*;
 
-use lyra_ecs::{query::{Entities, ViewOne}, relation::ChildOf, Bundle, Component, World};
+use lyra_ecs::{query::{Entities, Query}, relation::ChildOf, Bundle, Component, World};
 use lyra_math::Transform;
 
 // So we can use lyra_ecs::Component derive macro
@@ -95,7 +95,7 @@ impl SceneGraph {
     /// The traversal does not include the root scene node.
     pub fn traverse_down<F, Q>(&self, mut callback: F)
     where
-        F: FnMut(&World, &SceneNode, ViewOne<Q::Query>),
+        F: FnMut(&World, &SceneNode, Option<<Q::Query as Query>::Item<'_>>),
         Q: lyra_ecs::query::AsQuery,
     {
         self.traverse_down_from::<F, Q>(self.root_node.clone(), &mut callback);
@@ -105,7 +105,7 @@ impl SceneGraph {
     /// SceneNode and its world transform.
     fn traverse_down_from<F, Q>(&self, start: SceneNode, callback: &mut F)
     where
-        F: FnMut(&World, &SceneNode, ViewOne<Q::Query>),
+        F: FnMut(&World, &SceneNode, Option<<Q::Query as Query>::Item<'_>>),
         Q: lyra_ecs::query::AsQuery,
     {
         let v = self.world
@@ -211,7 +211,7 @@ pub mod tests {
 
         let mut idx = 0;
         scene.traverse_down::<_, &WorldTransform>(|_, _, v| {
-            let pos = v.get().unwrap();
+            let pos = v.unwrap();
             if idx == 0 {
                 assert_eq!(**pos, Transform::from_translation(v2s[idx]));
             } else if idx == 1 {

crates/lyra-scene/src/node.rs

@@ -25,7 +25,7 @@ impl SceneNode {
         if let Some(parent) = self.parent {
             let v = graph.world.view_one::<&RelationOriginComponent<ChildOf>>(parent);
             
-            let p_parent = if let Some(pp) = v.get() {
+            let p_parent = if let Some(pp) = v {
                 Some(pp.target())
             } else { None };
 
@@ -81,7 +81,7 @@ mod tests {
         let view = scene.world.filtered_view::<(Entities, &mut WorldTransform, &Transform, Option<&ResHandle<SceneGraph>>), Not<Has<RelationOriginComponent<ChildOf>>>>();
         crate::system_update_world_transforms(&scene.world, view).unwrap();
 
-        let tran = scene.world.view_one::<&WorldTransform>(b.entity).get().unwrap();
+        let tran = scene.world.view_one::<&WorldTransform>(b.entity).unwrap();
         assert_eq!(**tran, Transform::from_translation(Vec3::new(60.0, 60.0, 60.0)));
     }
 }

crates/lyra-scene/src/world_transform.rs

@@ -104,7 +104,7 @@ mod tests {
         let view = world.filtered_view::<(Entities, &mut WorldTransform, &Transform, Option<&ResHandle<SceneGraph>>), Not<Has<RelationOriginComponent<ChildOf>>>>();
         system_update_world_transforms(&world, view).unwrap();
 
-        let g = world.view_one::<&WorldTransform>(child).get().unwrap();
+        let g = world.view_one::<&WorldTransform>(child).unwrap();
         assert_eq!(**g, Transform::from_xyz(25.0, 25.0, 25.0));
     }
 
@@ -131,7 +131,7 @@ mod tests {
 
         let mut base_offset = 25.0;
         for child in children.into_iter() {
-            let g = world.view_one::<&WorldTransform>(child).get().unwrap();
+            let g = world.view_one::<&WorldTransform>(child).unwrap();
             println!("Child {:?} at {:?}", child, g.translation);
             assert_eq!(**g, Transform::from_xyz(base_offset, base_offset, base_offset));
 
@@ -162,7 +162,7 @@ mod tests {
         let view = world.filtered_view::<(Entities, &mut WorldTransform, &Transform, Option<&ResHandle<SceneGraph>>), Not<Has<RelationOriginComponent<ChildOf>>>>();
         system_update_world_transforms(&world, view).unwrap();
 
-        let g = world.view_one::<&WorldTransform>(five_child).get().unwrap();
+        let g = world.view_one::<&WorldTransform>(five_child).unwrap();
         assert_eq!(**g, Transform::from_xyz(611.0, 248.0, 899.0));
     }
 
@@ -189,13 +189,13 @@ mod tests {
         let view = world.filtered_view::<(Entities, &mut WorldTransform, &Transform, Option<&ResHandle<SceneGraph>>), Not<Has<RelationOriginComponent<ChildOf>>>>();
         system_update_world_transforms(&world, view).unwrap();
 
-        let g = world.view_one::<&WorldTransform>(five_child).get().unwrap();
+        let g = world.view_one::<&WorldTransform>(five_child).unwrap();
         assert_eq!(**g, Transform::from_xyz(536.0, 102.0, 817.0));
 
-        let g = world.view_one::<&WorldTransform>(thir_chi).get().unwrap();
+        let g = world.view_one::<&WorldTransform>(thir_chi).unwrap();
         assert_eq!(**g, Transform::from_xyz(76.0, 110.0, 42.0));
 
-        let g = world.view_one::<&WorldTransform>(four_child).get().unwrap();
+        let g = world.view_one::<&WorldTransform>(four_child).unwrap();
         assert_eq!(**g, Transform::from_xyz(100.0, 171.0, 107.0));
     }
 }

examples/2d/src/main.rs

@@ -1,9 +1,11 @@
 use lyra_engine::{
     assets::{Image, ResourceManager},
     ecs::{
-        query::{Res, ResMut, View}, Commands, Component, Entity, World
+        query::{Res, View, WorldTick},
+        relation::{ChildOf, RelationOriginComponent},
+        Commands, Component, Entity, World,
     },
-    game::App,
+    game::{App, GameStages},
     gltf::Gltf,
     input::{
         Action, ActionHandler, ActionKind, ActionMapping, ActionMappingId, ActionSource,
@@ -18,8 +20,8 @@ use lyra_engine::{
         ACTLBL_MOVE_LEFT_RIGHT, ACTLBL_MOVE_UP_DOWN,
     },
     sprite::{
-        self, AtlasAnimations, AtlasSprite, Pivot, RelativeToTile, Sprite, SpriteAnimation,
-        TextureAtlas, TileMap, TileMapPlugin,
+        self, AtlasAnimations, AtlasSprite, Pivot, Sprite, SpriteAnimation, TextureAtlas, Tile,
+        TileMap, TileMapPlugin, TileMapPos,
     },
     DeltaTime,
 };
@@ -27,7 +29,6 @@ use rand::{
     distributions::{Distribution, WeightedIndex},
     Rng,
 };
-use tracing::debug;
 
 #[async_std::main]
 async fn main() {
@@ -105,41 +106,21 @@ async fn main() {
         .with_plugin(setup_scene_plugin)
         .with_plugin(action_handler_plugin)
         .with_plugin(TileMapPlugin)
-        //.with_plugin(camera_debug_plugin)
         .with_plugin(TopDown2dCameraPlugin)
-        .with_system(
+        .add_system_to_stage(
+            GameStages::Last,
             "update_world_transforms",
             system_update_world_transforms,
             &[],
-        ).with_system(
-            "spawn_egg",
-            system_spawn_egg,
-            &[],
-        ).with_system(
-            "egg_location",
-            system_egg_location,
-            &[],
-        );
+        )
+        .with_system("spawn_egg", system_spawn_egg, &[]);
     a.run();
 }
 
 fn setup_scene_plugin(app: &mut App) {
-    /* app.with_system(
-        "sprite_atlas_animation",
-        sprite::system_sprite_atlas_animation,
-        &[],
-    ); */
-
     let world = &mut app.world;
     let resman = world.get_resource_mut::<ResourceManager>().unwrap();
 
-    let cube_gltf = resman
-        .request::<Gltf>("../assets/cube-texture-embedded.gltf")
-        .unwrap();
-
-    cube_gltf.wait_recurse_dependencies_load().unwrap();
-    let cube_mesh = &cube_gltf.data_ref().unwrap().scenes[0];
-
     let grass_tileset = resman
         .request::<Image>("../assets/sprout_lands/Tilesets/Grass.png")
         .unwrap();
@@ -209,7 +190,7 @@ fn setup_scene_plugin(app: &mut App) {
         },
         Transform::from_xyz(
             (map_size.x * tile_size.x) as f32 * 0.5,
-            (map_size.y * tile_size.y) as f32 * 0.5,
+            (map_size.y * tile_size.y) as f32 * -0.5,
             0.0,
         ),
         TopDown2dCamera {
@@ -223,25 +204,13 @@ fn setup_scene_plugin(app: &mut App) {
 
 struct GroundTileMap(Entity);
 
-#[derive(Component)]
-struct EggEntity;
-
-fn system_egg_location(view: View<(&WorldTransform, &EggEntity)>) -> anyhow::Result<()> {
-    for (pos, _) in view.into_iter() {
-        println!("Found egg at world pos {:?}", **pos);
-    }
-
-    Ok(())
-}
-
 fn system_spawn_egg(
     mut commands: Commands,
     inputs: Res<ActionHandler>,
     tile_map: Res<GroundTileMap>,
     resman: Res<ResourceManager>,
+    wtick: WorldTick,
 ) -> anyhow::Result<()> {
-    let debug_state = inputs.get_action_state("Debug").unwrap();
-
     if inputs.was_action_just_pressed("Debug").unwrap() {
         let egg = resman
             .request::<Image>("../assets/sprout_lands/Objects/Egg_item.png")
@@ -250,12 +219,14 @@ fn system_spawn_egg(
         let x = rand::thread_rng().gen_range(0..32);
         let y = rand::thread_rng().gen_range(0..16);
 
-        let rtt = RelativeToTile {
+        let rtt = TileMapPos {
             tilemap_entity: tile_map.0,
             position: UVec2::new(x, y),
-            z_level: -9,
+            z_level: 2,
         };
 
+        //println!("Spawned egg at ({}, {}) on tick {}", x, y, **wtick);
+
         commands.spawn((
             Sprite {
                 texture: egg,
@@ -263,7 +234,6 @@ fn system_spawn_egg(
                 pivot: Pivot::TopLeft,
             },
             rtt,
-            EggEntity
         ));
     }