Switch to lyra-ecs systems, move ecs mod to scene mod, reexport lyra-ecs as ecs

Cargo.lock

@@ -2335,7 +2335,6 @@ dependencies = [
  "anyhow",
  "async-std",
  "fps_counter",
- "lyra-ecs",
  "lyra-engine",
  "tracing",
 ]

examples/testbed/Cargo.toml

@@ -7,7 +7,7 @@ edition = "2021"
 
 [dependencies]
 lyra-engine = { path = "../../", version = "0.0.1" }
-lyra-ecs = { path = "../../lyra-ecs"}
+#lyra-ecs = { path = "../../lyra-ecs"}
 anyhow = "1.0.75"
 async-std = "1.12.0"
 tracing = "0.1.37"

examples/testbed/src/free_fly_camera.rs

@@ -1,12 +1,10 @@
-use std::ops::Deref;
+use std::{ops::Deref, ptr::NonNull};
 
-use lyra_ecs::{Component, world::World};
 use lyra_engine::{
-    ecs::{components::{camera::CameraComponent, DeltaTime}, EventQueue, SimpleSystem},
     game::Game,
     input::{InputButtons, KeyCode, MouseMotion},
     math::{Quat, Vec3, EulerRot},
-    plugin::Plugin,
+    plugin::Plugin, ecs::{system::System, world::World, Access, Component}, DeltaTime, EventQueue, scene::CameraComponent,
 };
 
 #[derive(Clone, Component)]
@@ -44,14 +42,15 @@ impl FreeFlyCamera {
 
 pub struct FreeFlyCameraPlugin;
 
-impl SimpleSystem for FreeFlyCameraPlugin {
-    fn execute_mut(&mut self, world: &mut World) -> anyhow::Result<()> {
+impl System for FreeFlyCameraPlugin {
+    fn execute(&mut self, mut world: NonNull<World>) -> anyhow::Result<()> {
+        let world = unsafe { world.as_mut() };
         let mut camera_rot = Vec3::default();
 
         let delta_time = **world.get_resource::<DeltaTime>();
 
         let events = world
-            .try_get_resource_mut::<EventQueue>()
+            .try_get_resource::<EventQueue>()
             .and_then(|q| q.read_events::<MouseMotion>());
 
         let keys = world
@@ -153,6 +152,10 @@ impl SimpleSystem for FreeFlyCameraPlugin {
 
         Ok(())
     }
+
+    fn world_access(&self) -> lyra_engine::ecs::Access {
+        Access::Write
+    }
 }
 
 impl Plugin for FreeFlyCameraPlugin {

examples/testbed/src/main.rs

@@ -1,4 +1,6 @@
-use lyra_engine::{math::{self, Vec3}, ecs::{components::{transform::TransformComponent, camera::CameraComponent, model::ModelComponent, DeltaTime}, EventQueue, SimpleSystem, Criteria, CriteriaSchedule, BatchedSystem, lyra_ecs::{Component, world::World}}, math::Transform, input::{KeyCode, InputButtons, MouseMotion, ActionHandler, Layout, Action, ActionKind, LayoutId, ActionMapping, Binding, ActionSource, ActionMappingId, InputActionPlugin, ActionState}, game::Game, plugin::Plugin, render::{window::{CursorGrabMode, WindowOptions}, light::{PointLight, directional::DirectionalLight, SpotLight}}, change_tracker::Ct};
+use std::ptr::NonNull;
+
+use lyra_engine::{math::{self, Vec3}, math::Transform, input::{KeyCode, InputButtons, MouseMotion, ActionHandler, Layout, Action, ActionKind, LayoutId, ActionMapping, Binding, ActionSource, ActionMappingId, InputActionPlugin, ActionState}, game::Game, plugin::Plugin, render::{window::{CursorGrabMode, WindowOptions}, light::{PointLight, directional::DirectionalLight, SpotLight}}, change_tracker::Ct, ecs::{system::{Criteria, CriteriaSchedule, BatchedSystem, IntoSystem}, world::World, Component}, DeltaTime, scene::{TransformComponent, ModelComponent, CameraComponent}};
 use lyra_engine::assets::{ResourceManager, Model};
 
 mod free_fly_camera;
@@ -39,7 +41,8 @@ impl FixedTimestep {
 }
 
 impl Criteria for FixedTimestep {
-    fn can_run(&mut self, world: &mut World, check_count: u32) -> CriteriaSchedule {
+    fn can_run(&mut self, mut world: NonNull<World>, check_count: u32) -> CriteriaSchedule {
+        let world = unsafe { world.as_mut() };
         if check_count == 0 {
             let delta_time = world.get_resource::<DeltaTime>();
             self.accumulator += **delta_time;
@@ -218,7 +221,7 @@ async fn main() {
         
         let mut sys = BatchedSystem::new();
         sys.with_criteria(FixedTimestep::new(45));
-        sys.with_system(spin_system);
+        sys.with_system(spin_system.into_system());
         //sys.with_system(fps_system);
 
         game.with_system("fixed", sys, &[]);
@@ -263,7 +266,7 @@ async fn main() {
     
     Game::initialize().await
         .with_plugin(lyra_engine::DefaultPlugins)
-        .with_startup_system(setup_sys)
+        .with_startup_system(setup_sys.into_system())
         .with_plugin(action_handler_plugin)
         //.with_plugin(fps_plugin)
         .with_plugin(jiggle_plugin)

lyra-ecs/lyra-ecs-derive/src/lib.rs

@@ -1,21 +1,16 @@
 use quote::quote;
 use syn::{parse_macro_input, DeriveInput};
 
-
 #[proc_macro_derive(Component)]
 pub fn derive_component(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
     let input = parse_macro_input!(input as DeriveInput);
-
-    //let generics = input.generics.clone()
     let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
 
     let type_ident = &input.ident;
-    //type_ident.span().
-
     let type_name = type_ident.to_string();
 
     proc_macro::TokenStream::from(quote! {
-        impl #impl_generics ::lyra_ecs::Component for #type_ident #ty_generics #where_clause {
+        impl #impl_generics lyra_engine::ecs::Component for #type_ident #ty_generics #where_clause {
             fn name() -> &'static str {
                 #type_name
             }

lyra-ecs/src/lib.rs

@@ -3,31 +3,37 @@ use crate::world::World;
 extern crate self as lyra_ecs;
 //mod lyra_ecs { pub use super::*; }
 
-mod archetype;
+pub(crate) mod lyra_engine {
+    pub(crate) mod ecs {
+        pub use super::super::*;
+    }
+}
+
+pub mod archetype;
 pub use archetype::*;
 
 pub mod world;
 pub use world::*;
 
-mod bundle;
+pub mod bundle;
 pub use bundle::*;
 
-mod component;
+pub mod component;
 pub use component::*;
 
-mod query;
-pub use query::*;
+pub mod query;
+//pub use query::*;
 
-mod component_info;
+pub mod component_info;
 pub use component_info::*;
 
-mod resource;
+pub mod resource;
 pub use resource::*;
 
-mod system;
-pub use system::*;
+pub mod system;
+//pub use system::*;
 
-mod tick;
+pub mod tick;
 pub use tick::*;
 
 pub use lyra_ecs_derive::*;

lyra-ecs/src/query/borrow.rs

@@ -208,7 +208,7 @@ impl<T: 'static> AsQuery for &mut T {
 mod tests {
     use std::{any::TypeId, mem::size_of, marker::PhantomData, ptr::NonNull};
 
-    use crate::{world::{World, Entity, EntityId}, archetype::{Archetype, ArchetypeId}, query::View, tests::Vec2, bundle::Bundle, Fetch, DynTypeId, Tick};
+    use crate::{world::{World, Entity, EntityId}, archetype::{Archetype, ArchetypeId}, query::{View, Fetch}, tests::Vec2, bundle::Bundle, DynTypeId, Tick};
 
     use super::{QueryBorrow, QueryBorrowMut, FetchBorrowMut};
 

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

@@ -1,10 +1,12 @@
 use std::{ptr::NonNull, cell::Ref};
 
-use crate::{Fetch, world::World, Query, ComponentColumn, ComponentInfo};
+use crate::{world::World, ComponentColumn, ComponentInfo};
 
 pub mod view;
 pub use view::*;
 
+use super::Fetch;
+
 /// Data that rust does not know the type of
 pub struct DynamicType {
     pub info: ComponentInfo,

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

@@ -1,6 +1,6 @@
 use std::ops::Range;
 
-use crate::{world::World, Archetype, ArchetypeEntityId, Fetch, ArchetypeId};
+use crate::{world::World, Archetype, ArchetypeEntityId, ArchetypeId, query::Fetch};
 
 use super::{QueryDynamicType, FetchDynamicType, DynamicType};
 
@@ -104,7 +104,7 @@ impl<'a> Iterator for DynamicViewIter<'a> {
 mod tests {
     use std::{alloc::Layout, ptr::NonNull};
 
-    use crate::{world::World, MemoryLayout, ComponentInfo, DynTypeId, DynamicBundle, dynamic::QueryDynamicType};
+    use crate::{world::World, MemoryLayout, ComponentInfo, DynTypeId, DynamicBundle, query::dynamic::QueryDynamicType};
 
     use super::DynamicView;
 

lyra-ecs/src/query/entities.rs

@@ -1,6 +1,6 @@
-use crate::{world::{Entity, World}, archetype::{Archetype, ArchetypeId}, AsQuery};
+use crate::{world::{Entity, World}, archetype::{Archetype, ArchetypeId}};
 
-use super::{Fetch, Query};
+use super::{Fetch, Query, AsQuery};
 
 pub struct EntitiesFetch {
     entities: Vec<Entity>,

lyra-ecs/src/query/resource.rs

@@ -152,7 +152,7 @@ impl<R: ResourceObject> AsQuery for QueryResourceMut<R> {
 }
 #[cfg(test)]
 mod tests {
-    use crate::{world::World, tests::{Vec2, Vec3}, QueryResourceMut};
+    use crate::{world::World, tests::{Vec2, Vec3}, query::QueryResourceMut};
 
     use super::QueryResource;
 

lyra-ecs/src/query/tick.rs

@@ -1,6 +1,8 @@
 use std::marker::PhantomData;
 
-use crate::{ComponentColumn, Fetch, Tick, DynTypeId, Query, world::World, AsQuery};
+use crate::{ComponentColumn, Tick, DynTypeId, world::World};
+
+use super::{Query, Fetch, AsQuery};
 
 #[derive(Clone, Copy, Debug, Default)]
 pub struct TickOf<T> {

lyra-ecs/src/system/batched.rs

@@ -1,12 +1,14 @@
 use lyra_ecs::world::World;
 
-use super::{SimpleSystem, Criteria};
+use crate::Access;
+
+use super::{System, Criteria};
 
 /// A system that executes a batch of systems in order that they were given.
 /// You can optionally add criteria that must pass before the systems are
 /// executed.
 pub struct BatchedSystem {
-    systems: Vec<Box<dyn SimpleSystem>>,
+    systems: Vec<Box<dyn System>>,
     criteria: Vec<Box<dyn Criteria>>,
     criteria_checks: u32,
 }
@@ -23,7 +25,7 @@ impl BatchedSystem {
 
     pub fn with_system<S>(&mut self, system: S) -> &mut Self
     where
-        S: SimpleSystem + 'static
+        S: System + 'static
     {
         self.systems.push(Box::new(system));
         self
@@ -38,8 +40,16 @@ impl BatchedSystem {
     }
 }
 
-impl SimpleSystem for BatchedSystem {
-    fn execute_mut(&mut self, world: &mut World) -> anyhow::Result<()> {
+impl System for BatchedSystem {
+    fn world_access(&self) -> crate::Access {
+        if self.systems.iter().any(|s| s.world_access() == Access::Write) {
+            Access::Write
+        } else {
+            Access::Read
+        }
+    }
+
+    fn execute(&mut self, world: std::ptr::NonNull<World>) -> anyhow::Result<()> {
         let mut can_run = true;
         let mut check_again = false;
 
@@ -60,13 +70,13 @@ impl SimpleSystem for BatchedSystem {
 
         if can_run {
             for system in self.systems.iter_mut() {
-                system.execute_mut(world)?;
+                system.execute(world)?;
             }
         }
 
         if check_again {
             self.criteria_checks += 1;
-            self.execute_mut(world)?;
+            self.execute(world)?;
         }
 
         self.criteria_checks = 0;

lyra-ecs/src/system/criteria.rs

@@ -1,5 +1,8 @@
+use std::ptr::NonNull;
+
 use lyra_ecs::world::World;
 
+#[derive(Clone, Copy, Debug, Hash, PartialEq, Eq, PartialOrd, Ord)]
 pub enum CriteriaSchedule {
     Yes,
     No,
@@ -13,13 +16,14 @@ pub trait Criteria {
     /// Parameters:
     /// * `world` - The ecs world.
     /// * `check_count` - The amount of times the Criteria has been checked this tick.
-    fn can_run(&mut self, world: &mut World, check_count: u32) -> CriteriaSchedule;
+    fn can_run(&mut self, world: NonNull<World>, check_count: u32) -> CriteriaSchedule;
 }
 
 impl<F> Criteria for F
     where F: FnMut(&mut World, u32) -> CriteriaSchedule
 {
-    fn can_run(&mut self, world: &mut World, check_count: u32) -> CriteriaSchedule {
-        self(world, check_count)
+    fn can_run(&mut self, mut world: NonNull<World>, check_count: u32) -> CriteriaSchedule {
+        let world_mut = unsafe { world.as_mut() };
+        self(world_mut, check_count)
     }
 }

lyra-ecs/src/system/graph.rs

@@ -1,6 +1,8 @@
 use std::{collections::{HashMap, VecDeque, HashSet}, ptr::NonNull};
 
-use crate::{System, world::World};
+use super::System;
+
+use crate::world::World;
 
 #[derive(thiserror::Error, Debug)]
 pub enum GraphExecutorError {
@@ -55,8 +57,7 @@ impl GraphExecutor {
     }
 
     /// Executes the systems in the graph
-    pub fn execute(&mut self, world: &World, stop_on_error: bool) -> Result<Vec<GraphExecutorError>, GraphExecutorError> {
-        let world = NonNull::from(world);
+    pub fn execute(&mut self, world: NonNull<World>, stop_on_error: bool) -> Result<Vec<GraphExecutorError>, GraphExecutorError> {
         let mut stack = VecDeque::new();
         let mut visited = HashSet::new();
 
@@ -106,7 +107,9 @@ impl GraphExecutor {
 
 #[cfg(test)]
 mod tests {
-    use crate::{View, QueryBorrow, tests::Vec2, IntoSystem, world::World, Resource, ResourceMut};
+    use std::ptr::NonNull;
+
+    use crate::{world::World, query::{ResourceMut, View}, system::IntoSystem};
 
     use super::GraphExecutor;
 
@@ -150,7 +153,7 @@ mod tests {
         exec.insert_system("a", a_system.into_system(), &[]);
         exec.insert_system("b", b_system.into_system(), &["a"]);
 
-        exec.execute(&world, true).unwrap();
+        exec.execute(NonNull::from(&world), true).unwrap();
         println!("Executed systems");
 
         let order = world.get_resource::<Vec<String>>();

lyra-ecs/src/system/mod.rs

@@ -1,16 +1,30 @@
 use std::{ptr::NonNull, marker::PhantomData, cell::{Ref, RefMut}};
 
-use crate::{world::World, View, Query, Access, ResourceObject};
+use crate::{world::World, Access, ResourceObject, query::{Query, View}};
 
 pub mod graph;
+pub use graph::*;
+
+pub mod criteria;
+pub use criteria::*;
+
+pub mod batched;
+pub use batched::*;
 
 /// A system that does not mutate the world
 pub trait System {
+    /// A method that indicates the type of access of the world the system requires.
     fn world_access(&self) -> Access;
+
+    /// The actual execution of the system.
     fn execute(&mut self, world: NonNull<World>) -> anyhow::Result<()>;
+
+    /// A setup step of the System, called before `execute` ever runs.
+    fn setup(&self, world: NonNull<World>) -> anyhow::Result<()> {
+        Ok(())
+    }
 }
 
-/// A trait for converting something into a system.
 pub trait IntoSystem<T> {
     type System: System;
 
@@ -61,6 +75,21 @@ macro_rules! impl_fn_system_tuple {
             }
         }
 
+        /* impl<F, $($name: FnArg,)+> IntoSystem for F
+        where
+            F: FnMut($($name,)+) -> anyhow::Result<()>,
+            F: for<'a> FnMut($(<$name::Fetcher as FnArgFetcher>::Arg<'a>,)+) -> anyhow::Result<()>,
+        {
+            type System = FnSystem<F, ($($name::Fetcher,)+)>;
+
+            fn into_system(self) -> Self::System {
+                FnSystem {
+                    args: ($($name::Fetcher::new(),)+),
+                    inner: self
+                }
+            }
+        } */
+
         impl<F, $($name: FnArg,)+> IntoSystem<($($name,)+)> for F
         where
             F: FnMut($($name,)+) -> anyhow::Result<()>,
@@ -223,7 +252,7 @@ impl<R: ResourceObject> FnArgFetcher for ResourceMutArgFetcher<R> {
 mod tests {
     use std::{ptr::NonNull, cell::RefMut};
 
-    use crate::{tests::{Vec2, Vec3}, View, QueryBorrow, world::World};
+    use crate::{tests::{Vec2, Vec3}, world::World, query::{QueryBorrow, View}};
     use super::{System, IntoSystem};
 
     struct SomeCounter(u32);
@@ -311,6 +340,35 @@ mod tests {
         assert_eq!(counter.0, 20);
     }
 
+    #[test]
+    fn function_system() {
+        let mut world = World::new();
+        world.spawn((Vec2::rand(), Vec3::rand()));
+        world.spawn((Vec2::rand(), Vec3::rand()));
+        world.add_resource(SomeCounter(0));
+
+        let test_system = |world: &World| -> anyhow::Result<()> {
+            let mut counter = world.get_resource_mut::<SomeCounter>();
+            counter.0 += 10;
+
+            Ok(())
+        };
+
+        test_system.into_system().execute(NonNull::from(&world)).unwrap();
+
+        fn test_system(world: &mut World) -> anyhow::Result<()> {
+            let mut counter = world.get_resource_mut::<SomeCounter>();
+            counter.0 += 10;
+
+            Ok(())
+        }
+
+        test_system.into_system().execute(NonNull::from(&world)).unwrap();
+
+        let counter = world.get_resource::<SomeCounter>();
+        assert_eq!(counter.0, 20);
+    }
+
     #[test]
     fn resource_system() {
         let mut world = World::new();

lyra-ecs/src/tests.rs

@@ -1,15 +1,23 @@
-use lyra_ecs_derive::Component;
 use rand::Rng;
+
+use crate::Component;
+use crate::lyra_engine;
 //use crate::lyra_ecs;
 
 /// This source file includes some common things that tests are using.
 
-#[derive(Debug, Default, Clone, Copy, PartialEq, PartialOrd, Component)]
+#[derive(Debug, Default, Clone, Copy, PartialEq, PartialOrd)]
 pub struct Vec2 {
     pub x: f32,
     pub y: f32,
 }
 
+impl Component for Vec2 {
+    fn name() -> &'static str {
+        "Vec2"
+    }
+}
+
 impl Vec2 {
     pub fn new(x: f32, y: f32) -> Self {
         Self {

lyra-ecs/src/world.rs

@@ -1,6 +1,6 @@
 use std::{collections::{HashMap, VecDeque}, any::TypeId, cell::{Ref, RefMut}, ptr::NonNull};
 
-use crate::{archetype::{ArchetypeId, Archetype}, bundle::Bundle, component::Component, query::{ViewIter, View}, resource::ResourceData, Query, AsQuery, dynamic::{DynamicViewIter, QueryDynamicType, DynamicView}, ViewOne, ComponentInfo, DynTypeId, TickTracker, Tick};
+use crate::{archetype::{ArchetypeId, Archetype}, bundle::Bundle, component::Component, query::{Query, ViewIter, View, AsQuery}, resource::ResourceData, query::{dynamic::{DynamicViewIter, QueryDynamicType, DynamicView}, ViewOne}, ComponentInfo, DynTypeId, TickTracker, Tick};
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 pub struct EntityId(pub u64);
@@ -300,7 +300,7 @@ impl World {
 mod tests {
     use std::ops::Deref;
 
-    use crate::{tests::{Vec2, Vec3}, TickOf};
+    use crate::{tests::{Vec2, Vec3}, query::TickOf};
 
     use super::World;
 

src/delta_time.rs

@@ -1,7 +1,7 @@
 use std::borrow::BorrowMut;
 
 use instant::Instant;
-use lyra_ecs::{Component, world::World};
+use lyra_ecs::{Component, world::World, system::IntoSystem};
 
 use crate::plugin::Plugin;
 
@@ -36,6 +36,6 @@ pub struct DeltaTimePlugin;
 impl Plugin for DeltaTimePlugin {
     fn setup(&self, game: &mut crate::game::Game) {
         game.world().add_resource(DeltaTime(0.0, None));
-        game.with_system("delta_time", delta_time_system, &[]);
+        game.with_system("delta_time", delta_time_system.into_system(), &[]);
     }
 }

src/ecs/mod.rs

@@ -1,9 +0,0 @@
-pub use lyra_ecs;
-
-pub mod components;
-
-pub mod events;
-pub use events::*;
-
-pub mod system;
-pub use system::*;

src/ecs/system/mod.rs

@@ -1,127 +0,0 @@
-pub mod batched;
-pub use batched::*;
-
-pub mod criteria;
-pub use criteria::*;
-use lyra_ecs::world::World;
-
-use std::collections::HashMap;
-use petgraph::{stable_graph::{StableDiGraph, NodeIndex}, visit::Topo};
-use tracing::warn;
-
-/// A trait that represents a simple system
-pub trait SimpleSystem {
-    fn setup(&mut self, _world: &mut World) -> anyhow::Result<()> {
-        Ok(())
-    }
-
-    // todo: make async?
-    fn execute_mut(&mut self, world: &mut World) -> anyhow::Result<()>;
-}
-
-impl<S> SimpleSystem for S
-    where S: FnMut(&mut World) -> anyhow::Result<()>
-{
-    fn execute_mut(&mut self, world: &mut World) -> anyhow::Result<()> {
-        self(world)
-    }
-}
-
-struct SystemGraphNode {
-    name: String,
-    #[allow(dead_code)]
-    dependent_on: Vec<String>, // TODO
-    system: Box<dyn SimpleSystem>,
-}
-
-struct SystemGraphEdge {
-    
-}
-
-/// Dispatcher for multiple systems.
-/// 
-/// This struct uses a graph for finding executing systems with dependencies.
-/// At some point this will be multithreaded.
-pub struct SystemDispatcher {
-    graph: StableDiGraph<SystemGraphNode, SystemGraphEdge>,
-    node_refs: HashMap<String, NodeIndex>,
-}
-
-impl Default for SystemDispatcher {
-    fn default() -> Self {
-        Self {
-            graph: StableDiGraph::new(),
-            node_refs: HashMap::new(),
-        }
-    }
-}
-
-impl SystemDispatcher {
-    pub fn new() -> Self {
-        Self::default()
-    }
-
-    /// Adds a SimpleSystem to the SystemGraph.
-    ///  
-    /// WARN: Ensure that no cycles are created, this will cause the systems graph to not be sortable by topological sort,
-    /// and will cause a panic later on in the engine.
-    /// 
-    /// TODO: Return false if a cycle was created, making it impossible to know when to dispatch them. This will mean that the System would not of had been added.
-    pub fn add_system<S>(&mut self, name: &str, system: S, dependencies: &[&str]) -> bool
-    where
-        S: SimpleSystem + 'static
-    {
-        let name = name.to_string();
-        let dependencies: Vec<String> = dependencies.iter().map(|s| s.to_string()).collect();
-        let system = Box::new(system) as Box<dyn SimpleSystem>;
-
-        let added_index =
-            self.graph.add_node(SystemGraphNode {
-                name: name.to_string(),
-                dependent_on: dependencies.clone(),
-                system,
-            });
-
-        // store name ref to the graph node
-        self.node_refs.insert(name, added_index);
-
-        // find the dependencies in node_refs and add edges directed towards the new node
-        for depend in dependencies.into_iter() {
-            let idx = self.node_refs
-                .get(&depend)
-                .expect("Dependency not found!");
-
-            self.graph.add_edge(*idx, added_index, SystemGraphEdge { });
-        }
-
-        true
-    }
-
-    pub(crate) fn execute_systems(&mut self, world: &mut World) {
-        let mut topo = Topo::new(&self.graph);
-
-        while let Some(nx) = topo.next(&self.graph) {
-            let node = self.graph.node_weight_mut(nx).unwrap();
-
-            match node.system.execute_mut(world) {
-                Ok(()) => {},
-                Err(e) => {
-                    warn!("System execution of {} resulted in an error! '{}'.", node.name, e);
-
-                    // TODO: Find some way to stop traversing down a topopath in the graph executor and continue down a different one.
-                    // This might require a custom topopath implementation (preferably iterative). It would have to ensure that it
-                    // doesn't run other systems that are dependent on that failed system.
-                    return;
-                }
-            }
-        }
-    }
-}
-
-impl SimpleSystem for SystemDispatcher {
-    fn execute_mut(&mut self, world: &mut World) -> anyhow::Result<()> {
-        self.execute_systems(world);
-
-        Ok(())
-    }
-}

src/game.rs

@@ -1,8 +1,8 @@
-use std::{sync::Arc, collections::VecDeque};
+use std::{sync::Arc, collections::VecDeque, ptr::NonNull};
 
 use async_std::task::block_on;
 
-use lyra_ecs::world::World;
+use lyra_ecs::{world::World, system::{GraphExecutor, System}};
 use tracing::{info, error, Level, debug};
 use tracing_appender::non_blocking;
 use tracing_subscriber::{
@@ -13,7 +13,7 @@ use tracing_subscriber::{
 
 use winit::{window::{WindowBuilder, Window}, event::{Event, WindowEvent, KeyboardInput, ElementState, VirtualKeyCode, DeviceEvent}, event_loop::{EventLoop, ControlFlow}};
 
-use crate::{render::{renderer::{Renderer, BasicRenderer}, window::WindowOptions}, input::InputEvent, ecs::{SimpleSystem, SystemDispatcher, EventQueue, Events}, plugin::Plugin, change_tracker::Ct};
+use crate::{render::{renderer::{Renderer, BasicRenderer}, window::WindowOptions}, input::InputEvent, plugin::Plugin, change_tracker::Ct, EventQueue};
 
 pub struct Controls<'a> {
     pub world: &'a mut World,
@@ -37,18 +37,18 @@ struct GameLoop {
     
     world: World,
     /// higher priority systems
-    engine_sys_dispatcher: SystemDispatcher,
-    user_sys_dispatcher: SystemDispatcher,
+    engine_sys_dispatcher: GraphExecutor,
+    user_sys_dispatcher: GraphExecutor,
 }
 
 impl GameLoop {
-    pub async fn new(window: Arc<Window>, world: World, user_systems: SystemDispatcher) -> GameLoop {
+    pub async fn new(window: Arc<Window>, world: World, user_systems: GraphExecutor) -> GameLoop {
         Self {
             window: Arc::clone(&window),
             renderer: Box::new(BasicRenderer::create_with_window(window).await),
 
             world,
-            engine_sys_dispatcher: SystemDispatcher::new(),
+            engine_sys_dispatcher: GraphExecutor::new(),
             user_sys_dispatcher: user_systems,
         }
     }
@@ -67,11 +67,12 @@ impl GameLoop {
     }
 
     async fn update(&mut self) {
-        if let Err(e) = self.engine_sys_dispatcher.execute_mut(&mut self.world) {
+        let world_ptr = NonNull::from(&self.world);
+        if let Err(e) = self.engine_sys_dispatcher.execute(world_ptr, true) {
             error!("Error when executing engine ecs systems: '{}'", e);
         }
 
-        if let Err(e) = self.user_sys_dispatcher.execute_mut(&mut self.world) {
+        if let Err(e) = self.user_sys_dispatcher.execute(world_ptr, true) {
             error!("Error when executing user ecs systems: '{}'", e);
         }
     }
@@ -205,8 +206,8 @@ impl GameLoop {
 pub struct Game {
     world: Option<World>,
     plugins: VecDeque<Box<dyn Plugin>>,
-    system_dispatcher: Option<SystemDispatcher>,
-    startup_systems: VecDeque<Box<dyn SimpleSystem>>,
+    system_dispatcher: Option<GraphExecutor>,
+    startup_systems: VecDeque<Box<dyn System>>,
 }
 
 impl Default for Game {
@@ -214,7 +215,7 @@ impl Default for Game {
         Self {
             world: Some(World::new()),
             plugins: VecDeque::new(),
-            system_dispatcher: Some(SystemDispatcher::new()),
+            system_dispatcher: Some(GraphExecutor::new()),
             startup_systems: VecDeque::new(),
         }
     }
@@ -234,10 +235,10 @@ impl Game {
     /// Add a system to the ecs world
     pub fn with_system<S>(&mut self, name: &str, system: S, depends: &[&str]) -> &mut Self
     where
-        S: SimpleSystem + 'static
+        S: System + 'static
     {
         let system_dispatcher = self.system_dispatcher.as_mut().unwrap();
-        system_dispatcher.add_system(name, system, depends);
+        system_dispatcher.insert_system(name, system, depends);
 
         self
     }
@@ -246,7 +247,7 @@ impl Game {
     /// They will only be ran once
     pub fn with_startup_system<S>(&mut self, system: S) -> &mut Self
     where
-        S: SimpleSystem + 'static
+        S: System + 'static
     {
         self.startup_systems.push_back(Box::new(system));
 
@@ -294,8 +295,9 @@ impl Game {
         // run startup systems
         while let Some(mut startup) = self.startup_systems.pop_front() {
             let startup = startup.as_mut();
-            startup.setup(&mut world).expect("World returned an error!");
-            startup.execute_mut(&mut world).expect("World returned an error!");
+            let world_ptr = NonNull::from(&world);
+            startup.setup(world_ptr).expect("World returned an error!");
+            startup.execute(world_ptr).expect("World returned an error!");
         }
 
         // start winit event loops

src/input/action.rs

@@ -1,6 +1,6 @@
 use std::{collections::HashMap, cell::RefCell, borrow::BorrowMut, ops::Deref};
 
-use lyra_ecs::world::World;
+use lyra_ecs::{world::World, system::IntoSystem};
 
 use crate::{castable_any::CastableAny, plugin::Plugin};
 
@@ -424,6 +424,6 @@ pub struct InputActionPlugin;
 
 impl Plugin for InputActionPlugin {
     fn setup(&self, game: &mut crate::game::Game) {
-        game.with_system("input_actions", actions_system, &[]);
+        game.with_system("input_actions", actions_system.into_system(), &[]);
     }
 }

src/input/system.rs

@@ -1,8 +1,10 @@
+use std::ptr::NonNull;
+
 use glam::Vec2;
 use lyra_ecs::world::World;
 use winit::event::MouseScrollDelta;
 
-use crate::{ecs::{SimpleSystem, EventQueue}, plugin::Plugin,};
+use crate::{EventQueue, plugin::Plugin};
 
 use super::{events::*, InputButtons, InputEvent};
 
@@ -96,8 +98,9 @@ impl InputSystem {
     }
 }
 
-impl SimpleSystem for InputSystem {
-    fn execute_mut(&mut self, world: &mut World) -> anyhow::Result<()> {
+impl crate::ecs::system::System for InputSystem {
+    fn execute(&mut self, mut world: NonNull<World>) -> anyhow::Result<()> {
+        let world = unsafe { world.as_mut() };
         let queue = world.try_get_resource_mut::<EventQueue>()
             .and_then(|q| q.read_events::<InputEvent>());
 
@@ -113,6 +116,10 @@ impl SimpleSystem for InputSystem {
 
         Ok(())
     }
+
+    fn world_access(&self) -> lyra_ecs::Access {
+        lyra_ecs::Access::Write
+    }
 }
 
 /// Plugin that runs InputSystem

src/lib.rs

@@ -2,16 +2,26 @@
 #![feature(lint_reasons)]
 #![feature(trait_alias)]
 
+extern crate self as lyra_engine;
+
 pub mod game;
 pub mod render;
 pub mod resources;
-pub mod ecs;
 pub mod math;
 pub mod input;
 pub mod castable_any;
 pub mod plugin;
 pub mod change_tracker;
 
+pub mod events;
+pub use events::*;
+
+pub mod delta_time;
+pub use delta_time::*;
+
+pub mod scene;
+
 pub use lyra_resource as assets;
+pub use lyra_ecs as ecs;
 
 pub use plugin::DefaultPlugins;

src/plugin.rs

@@ -1,7 +1,7 @@
 use lyra_resource::ResourceManager;
 
-use crate::ecs::EventsPlugin;
-use crate::ecs::components::DeltaTimePlugin;
+use crate::EventsPlugin;
+use crate::DeltaTimePlugin;
 use crate::game::Game;
 use crate::input::InputPlugin;
 use crate::render::window::WindowPlugin;

src/render/camera.rs

@@ -1,6 +1,6 @@
 use winit::dpi::PhysicalSize;
 
-use crate::{math::{Angle, OPENGL_TO_WGPU_MATRIX}, ecs::components::camera::CameraComponent};
+use crate::{math::{Angle, OPENGL_TO_WGPU_MATRIX}, scene::CameraComponent};
 
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub enum CameraProjectionMode {

src/render/light/mod.rs

@@ -2,7 +2,7 @@ pub mod point;
 pub mod directional;
 pub mod spotlight;
 
-use lyra_ecs::{Entity, Tick, world::World, Entities, TickOf};
+use lyra_ecs::{Entity, Tick, world::World, query::{Entities, TickOf}};
 pub use point::*;
 pub use directional::*;
 pub use spotlight::*;
@@ -15,7 +15,7 @@ use wgpu::util::DeviceExt;
 
 use std::mem;
 
-use crate::{math::Transform, ecs::components::TransformComponent};
+use crate::{math::Transform, scene::TransformComponent};
 
 use self::directional::DirectionalLight;
 

src/render/renderer.rs

@@ -7,20 +7,19 @@ use std::borrow::Cow;
 use glam::Vec3;
 use instant::Instant;
 use itertools::izip;
-use lyra_ecs::{Entity, Entities, TickOf};
+use lyra_ecs::Entity;
+use lyra_ecs::query::{Entities, TickOf};
 use lyra_ecs::world::World;
 use tracing::{debug, warn};
 use wgpu::{BindGroup, BindGroupLayout, Limits};
 use wgpu::util::DeviceExt;
 use winit::window::Window;
 
-use crate::ecs::components::camera::CameraComponent;
-use crate::ecs::components::model::ModelComponent;
-use crate::ecs::components::transform::TransformComponent;
 use crate::math::{Transform, self};
 use crate::render::light::PointLightUniform;
 use crate::render::material::MaterialUniform;
 use crate::render::render_buffer::{BufferWrapperBuilder, BindGroupPair};
+use crate::scene::{ModelComponent, TransformComponent, CameraComponent};
 
 use super::camera::{RenderCamera, CameraUniform};
 use super::desc_buf_lay::DescVertexBufferLayout;

src/render/window.rs

@@ -1,13 +1,13 @@
 use std::{sync::Arc, collections::VecDeque};
 
 use glam::{Vec2, IVec2};
-use lyra_ecs::world::World;
+use lyra_ecs::{world::World, system::IntoSystem};
 use tracing::{warn, error};
 use winit::{window::{Window, Fullscreen}, dpi::{LogicalPosition, LogicalSize, PhysicalPosition}, error::ExternalError};
 
 pub use winit::window::{CursorGrabMode, CursorIcon, Icon, Theme, WindowButtons, WindowLevel};
 
-use crate::{plugin::Plugin, change_tracker::Ct, ecs::EventQueue, input::InputEvent};
+use crate::{plugin::Plugin, change_tracker::Ct, input::InputEvent, EventQueue};
 
 #[derive(Default, Clone)]
 pub enum WindowMode {
@@ -374,6 +374,6 @@ impl Plugin for WindowPlugin {
         let window_options = WindowOptions::default();
 
         game.world().add_resource(Ct::new(window_options));
-        game.with_system("window_updater", window_updater_system, &[]);
+        game.with_system("window_updater", window_updater_system.into_system(), &[]);
     }
 }

src/scene/mod.rs

@@ -12,6 +12,3 @@ pub use camera::*;
 
 pub mod free_fly_camera;
 pub use free_fly_camera::*;
-
-pub mod delta_time;
-pub use delta_time::*;