From 816d0c9bdd9e6d1022c5654ffdef186d73c02d5c Mon Sep 17 00:00:00 2001
From: Carter Anderson <mcanders1@gmail.com>
Date: Tue, 3 Dec 2019 00:30:30 -0800
Subject: [PATCH] wander spawner

---
 Cargo.toml               |   3 +-
 examples/simple.rs       | 189 +++++++++++++++++++++++++++++++++------
 src/application.rs       |  70 +++++++--------
 src/asset/mod.rs         |  28 +++++-
 src/core/mod.rs          |   3 +
 src/core/time.rs         |  26 ++++++
 src/render/shadow/mod.rs |  30 ++++++-
 tiny-town/README.md      |   3 +-
 8 files changed, 279 insertions(+), 73 deletions(-)
 create mode 100644 src/core/time.rs

diff --git a/Cargo.toml b/Cargo.toml
index eb8e53b035..48a24c66d1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,4 +13,5 @@ winit = "0.20.0-alpha4"
 glsl-to-spirv = "0.1"
 zerocopy = "0.2"
 log = "0.4"
-env_logger = "0.7"
\ No newline at end of file
+env_logger = "0.7"
+rand = "0.7.2"
\ No newline at end of file
diff --git a/examples/simple.rs b/examples/simple.rs
index b95ebe4643..3d2a1adc62 100644
--- a/examples/simple.rs
+++ b/examples/simple.rs
@@ -1,28 +1,149 @@
 use bevy::*;
-use bevy::{render::*, asset::{Asset, AssetStorage}, math};
+use bevy::{render::*, asset::{Asset, AssetStorage, Handle}, math, Schedulable};
+use rand::{rngs::StdRng, Rng, SeedableRng, random};
 
-// fn build_move_system() -> Box<dyn Scheduleable> {
-//     SystemBuilder::new("MoveSystem")
-//         .with_query(<>)
-// }
+fn build_wander_system(world: &mut World) -> Box<dyn Schedulable> {
+    let mut rng = StdRng::from_entropy();
+
+    SystemBuilder::new("Wander")
+        .read_resource::<Time>()
+        .with_query(<(
+            Read<Person>,
+            Read<Translation>,
+            Write<Wander>,
+            Write<NavigationPoint>,
+        )>::query())
+        .build(move |_, world, time , person_query| {
+            for (_, translation, mut wander, mut navigation_point) in person_query.iter(world) {
+                wander.elapsed += time.delta_seconds;
+                if wander.elapsed >= wander.duration {
+                    let direction = math::vec3(
+                        rng.gen_range(-1.0, 1.0),
+                        rng.gen_range(-1.0, 1.0),
+                        rng.gen_range(0.0, 0.001),
+                    ).normalize();
+                    let distance = rng.gen_range(wander.distance_bounds.x, wander.distance_bounds.y);
+                    navigation_point.target = translation.vector + direction * distance;
+                    wander.elapsed = 0.0;
+                    wander.duration = rng.gen_range(wander.duration_bounds.x, wander.duration_bounds.y);
+                }
+            }
+        })
+}
+
+fn build_navigate_system(world: &mut World) -> Box<dyn Schedulable> {
+    SystemBuilder::new("Navigate")
+        .with_query(<(
+            Read<Person>,
+            Write<Translation>,
+            Write<Velocity>,
+            Write<NavigationPoint>,
+        )>::query())
+        .build(move |_, world, _, person_query| {
+            for (_, mut translation, mut velocity, mut navigation_point) in person_query.iter(world) {
+                let distance = navigation_point.target - translation.vector;
+                if math::length(&distance) > 0.01 {
+                    let direction = distance.normalize();
+                    velocity.value = direction * 2.0;
+                } else {
+                    velocity.value = math::vec3(0.0, 0.0, 0.0);
+                }
+            }
+        })
+}
+
+fn build_move_system(world: &mut World) -> Box<dyn Schedulable> {
+    SystemBuilder::new("Move")
+        .read_resource::<Time>()
+        .with_query(<(
+            Write<Translation>,
+            Read<Velocity>,
+        )>::query())
+        .build(move |_, world, time , person_query| {
+            for (mut translation, velocity) in person_query.iter(world) {
+                translation.vector += velocity.value * time.delta_seconds;
+            }
+        })
+}
+
+fn build_print_status_system(world: &mut World) -> Box<dyn Schedulable> {
+    let mut elapsed = 0.0;
+    SystemBuilder::new("PrintStatus")
+        .read_resource::<Time>()
+        .with_query(<(
+            Read<Person>,
+        )>::query())
+        .build(move |_, world, time , person_query| {
+            elapsed += time.delta_seconds;
+            if elapsed > 1.0 {
+                println!("fps: {}", if time.delta_seconds == 0.0 { 0.0 } else { 1.0 / time.delta_seconds });
+                println!("peeps: {}", person_query.iter(world).count());
+                elapsed = 0.0;
+            }
+        })
+}
+
+fn build_spawner_system(world: &mut World) -> Box<dyn Schedulable> {
+    let mesh_handle = {
+        let mut mesh_storage = world.resources.get_mut::<AssetStorage<Mesh, MeshType>>().unwrap();
+        mesh_storage.get_named("cube").unwrap()
+    };
+    let mut elapsed = 0.0;
+    SystemBuilder::new("Spawner")
+        .read_resource::<Time>()
+        .with_query(<(
+            Read<Person>,
+        )>::query())
+        .build(move |command_buffer, world, time , person_query| {
+            elapsed += time.delta_seconds;
+            if elapsed > 0.5 {
+                for i in 0..20 {
+                    spawn_person(command_buffer, mesh_handle.clone());
+                }
+                elapsed = 0.0;
+            }
+        })
+}
+
+struct Person {
+}
+
+struct Velocity {
+    pub value: math::Vec3,
+}
+
+struct NavigationPoint {
+    pub target: math::Vec3,
+}
+
+struct Wander {
+    pub duration_bounds: math::Vec2,
+    pub distance_bounds: math::Vec2,
+    pub duration: f32,
+    pub elapsed: f32,
+}
 
 fn main() {
     let universe = Universe::new();
     let mut world = universe.create_world();
     let mut scheduler = SystemScheduler::<ApplicationStage>::new();
-    let transform_system_bundle = transform_system_bundle::build(&mut world);
-    scheduler.add_systems(ApplicationStage::Update, transform_system_bundle);
-    // Create a query which finds all `Position` and `Velocity` components
-    // let mut query = Read::<Transform>::query();
+
     let cube = Mesh::load(MeshType::Cube);
-    let plane = Mesh::load(MeshType::Plane{ size: 10 });
+    let plane = Mesh::load(MeshType::Plane{ size: 25 });
     let mut mesh_storage = AssetStorage::<Mesh, MeshType>::new();
 
-    // this currently breaks because Arcs cant be modified after they are cloned :(
-    let mesh_handle = mesh_storage.add(cube);
-    let plane_handle = mesh_storage.add(plane);
+    let mesh_handle = mesh_storage.add(cube, "cube");
+    let plane_handle = mesh_storage.add(plane, "plane");
     world.resources.insert(mesh_storage);
 
+    let transform_system_bundle = transform_system_bundle::build(&mut world);
+    scheduler.add_systems(ApplicationStage::Update, transform_system_bundle);
+    scheduler.add_system(ApplicationStage::Update, build_wander_system(&mut world));
+    scheduler.add_system(ApplicationStage::Update, build_navigate_system(&mut world));
+    scheduler.add_system(ApplicationStage::Update, build_move_system(&mut world));
+    scheduler.add_system(ApplicationStage::Update, build_spawner_system(&mut world));
+    scheduler.add_system(ApplicationStage::Update, build_print_status_system(&mut world));
+
     world.insert((), vec![
         // plane
         (
@@ -31,20 +152,8 @@ fn main() {
             LocalToWorld::identity(),
             Translation::new(0.0, 0.0, 0.0)
         ),
-        // cubes
-        (
-            Material::new(math::vec4(0.1, 0.1, 0.6, 1.0)),
-            mesh_handle.clone(),
-            LocalToWorld::identity(),
-            Translation::new(1.5, 0.0, 1.0)
-        ),
-        (
-            Material::new(math::vec4(0.6, 0.1, 0.1, 1.0)),
-            mesh_handle,
-            LocalToWorld::identity(),
-            Translation::new(-1.5, 0.0, 1.0)
-        ),
     ]);
+
     world.insert((), vec![
         // lights
         (
@@ -80,6 +189,7 @@ fn main() {
             Translation::new(-5.0, 7.0, 10.0)
         ),
     ]);
+
     world.insert((), vec![
         // camera
         (
@@ -90,7 +200,7 @@ fn main() {
                 aspect_ratio: 1.0,
             }),
             LocalToWorld(math::look_at_rh(
-                &math::vec3(3.0, -10.0, 6.0),
+                &math::vec3(6.0, -40.0, 20.0),
                 &math::vec3(0.0, 0.0, 0.0),
                 &math::vec3(0.0, 0.0, 1.0),)),
             // Translation::new(0.0, 0.0, 0.0),
@@ -98,4 +208,29 @@ fn main() {
     ]);
 
     Application::run(universe, world, scheduler);
+}
+
+
+fn spawn_person(command_buffer: &mut CommandBuffer, mesh_handle: Handle<Mesh>) {
+    command_buffer.insert((), vec![
+        (
+            Person{},
+            Wander {
+                duration_bounds: math::vec2(3.0, 10.0),
+                distance_bounds: math::vec2(-50.0, 50.0),
+                elapsed: 0.0,
+                duration: 0.0,
+            },
+            NavigationPoint {
+                target: math::vec3(0.0, 0.0, 0.0),
+            },
+            Velocity {
+                value: math::vec3(0.0, 0.0, 0.0),
+            },
+            Material::new(math::vec4(0.5, 0.3, 0.3, 1.0) * random::<f32>()),
+            mesh_handle.clone(),
+            LocalToWorld::identity(),
+            Translation::new(0.0, 0.0, 1.0)
+        ),
+    ]);
 }
\ No newline at end of file
diff --git a/src/application.rs b/src/application.rs
index bf1d48d403..7614a5c930 100644
--- a/src/application.rs
+++ b/src/application.rs
@@ -9,11 +9,12 @@ use zerocopy::AsBytes;
 use legion::prelude::*;
 
 use std::sync::Arc;
+use std::rc::Rc;
 use std::mem;
 
 use wgpu::{Surface, Device, Queue, SwapChain, SwapChainDescriptor};
 
-use crate::{vertex::*, render::*, math, LocalToWorld, ApplicationStage};
+use crate::{vertex::*, render::*, math, LocalToWorld, ApplicationStage, Time};
 
 pub struct Application
 {
@@ -37,13 +38,13 @@ impl Application {
         (Self::MAX_LIGHTS * mem::size_of::<LightRaw>()) as wgpu::BufferAddress;
 
         let local_bind_group_layout =
-            self.device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+            Rc::new(self.device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
                 bindings: &[wgpu::BindGroupLayoutBinding {
                     binding: 0,
                     visibility: wgpu::ShaderStage::VERTEX | wgpu::ShaderStage::FRAGMENT,
                     ty: wgpu::BindingType::UniformBuffer { dynamic: false },
                 }],
-            });
+            }));
 
         let light_uniform_buffer = Arc::new(UniformBuffer {
             buffer: self.device.create_buffer(&wgpu::BufferDescriptor {
@@ -55,29 +56,6 @@ impl Application {
             size: light_uniform_size,
         });
 
-        let mut materials = <Write<Material>>::query();
-        for mut material in materials.iter(&mut self.world) {
-            let entity_uniform_size = mem::size_of::<MaterialUniforms>() as wgpu::BufferAddress;
-            let uniform_buf = self.device.create_buffer(&wgpu::BufferDescriptor {
-                size: entity_uniform_size,
-                usage: wgpu::BufferUsage::UNIFORM | wgpu::BufferUsage::COPY_DST,
-            });
-
-            let bind_group = self.device.create_bind_group(&wgpu::BindGroupDescriptor {
-                layout: &local_bind_group_layout,
-                bindings: &[wgpu::Binding {
-                    binding: 0,
-                    resource: wgpu::BindingResource::Buffer {
-                        buffer: &uniform_buf,
-                        range: 0 .. entity_uniform_size,
-                    },
-                }],
-            });
-
-            material.bind_group = Some(bind_group);
-            material.uniform_buf = Some(uniform_buf);
-        }
-
         let light_count = <Read<Light>>::query().iter(&mut self.world).count();
         let forward_uniforms = ForwardUniforms {
             proj: math::Mat4::identity().into(),
@@ -103,12 +81,25 @@ impl Application {
             ],
         };
 
-        let shadow_pass = ShadowPass::new(&mut self.device, &mut self.world, light_uniform_buffer.clone(), vb_desc.clone(), &local_bind_group_layout, Self::MAX_LIGHTS as u32);
+        let shadow_pass = ShadowPass::new(&mut self.device, &mut self.world, light_uniform_buffer.clone(), vb_desc.clone(), local_bind_group_layout.clone(), Self::MAX_LIGHTS as u32);
         let forward_pass = ForwardPass::new(&mut self.device, forward_uniforms, light_uniform_buffer.clone(), &shadow_pass, vb_desc, &local_bind_group_layout, &self.swap_chain_descriptor);
         self.render_passes.push(Box::new(shadow_pass));
         self.render_passes.push(Box::new(forward_pass));
     }
 
+    fn update(&mut self) {
+        {
+            let mut time = self.world.resources.get_mut::<Time>().unwrap();
+            time.start();
+        }
+        self.scheduler.execute(&mut self.world);
+        self.render();
+        {
+            let mut time = self.world.resources.get_mut::<Time>().unwrap();
+            time.stop();
+        }
+    }
+
     fn resize(&mut self, width: u32, height: u32)
     {
         self.swap_chain_descriptor.width = width;
@@ -137,7 +128,7 @@ impl Application {
         self.queue.submit(&[command_buffer]);
     }
 
-    fn update(&mut self, _: WindowEvent)
+    fn handle_event(&mut self, _: WindowEvent)
     {
     }
 
@@ -150,7 +141,7 @@ impl Application {
         let mut encoder =
             self.device.create_command_encoder(&wgpu::CommandEncoderDescriptor { todo: 0 });
 
-        let mut entities = <(Read<Material>, Read<LocalToWorld>)>::query();
+        let mut entities = <(Write<Material>, Read<LocalToWorld>)>::query();
         let entities_count = entities.iter(&mut self.world).count();
         let size = mem::size_of::<MaterialUniforms>();
         let temp_buf_data = self.device
@@ -174,7 +165,12 @@ impl Application {
         }
 
         let temp_buf = temp_buf_data.finish();
+        
+        for pass in self.render_passes.iter_mut() {
+            pass.render(&mut self.device, &mut frame, &mut encoder, &mut self.world);
+        }
 
+        // TODO: this should happen before rendering
         for (i, (entity, _)) in entities.iter(&mut self.world).enumerate() {
             encoder.copy_buffer_to_buffer(
                 &temp_buf,
@@ -185,16 +181,12 @@ impl Application {
             );
         }
 
-        for pass in self.render_passes.iter_mut() {
-            pass.render(&mut self.device, &mut frame, &mut encoder, &mut self.world);
-        }
-
         let command_buffer = encoder.finish();
         self.queue.submit(&[command_buffer]);
     }
 
     #[allow(dead_code)]
-    pub fn run(universe: Universe, world: World, system_scheduler: SystemScheduler<ApplicationStage>) {
+    pub fn run(universe: Universe, mut world: World, system_scheduler: SystemScheduler<ApplicationStage>) {
         env_logger::init();
         let event_loop = EventLoop::new();
         log::info!("Initializing the window...");
@@ -217,6 +209,7 @@ impl Application {
         let (window, hidpi_factor, size, surface) = {
             let window = winit::window::Window::new(&event_loop).unwrap();
             window.set_title("bevy");
+            window.set_inner_size((1920, 1080).into());
             let hidpi_factor = window.hidpi_factor();
             let size = window.inner_size().to_physical(hidpi_factor);
             let surface = wgpu::Surface::create(&window);
@@ -231,7 +224,9 @@ impl Application {
             present_mode: wgpu::PresentMode::Vsync,
         };
         let swap_chain = device.create_swap_chain(&surface, &swap_chain_descriptor);
-    
+        
+        world.resources.insert(Time::new());
+
         log::info!("Initializing the example...");
         let mut app = Application {
             universe,
@@ -280,12 +275,11 @@ impl Application {
                         *control_flow = ControlFlow::Exit;
                     }
                     _ => {
-                        app.update(event);
+                        app.handle_event(event);
                     }
                 },
                 event::Event::EventsCleared => {
-                    app.scheduler.execute(&mut app.world);
-                    app.render();
+                    app.update();
                 }
                 _ => (),
             }
diff --git a/src/asset/mod.rs b/src/asset/mod.rs
index b4bc5a71b5..db45beab6d 100644
--- a/src/asset/mod.rs
+++ b/src/asset/mod.rs
@@ -1,4 +1,4 @@
-use std::{sync::{Arc, RwLock}, marker::PhantomData, ops::Drop};
+use std::{sync::{Arc, RwLock}, marker::PhantomData, ops::Drop, collections::HashMap};
 
 pub struct Handle<T>
 {
@@ -35,6 +35,7 @@ pub trait Asset<D> {
 pub struct AssetStorage<T, D> where T: Asset<D> {
     assets: Vec<Option<T>>,
     free_indices: Arc<RwLock<Vec<usize>>>,
+    names: HashMap<String, Arc<RwLock<usize>>>,
     marker: PhantomData<D>,
 }
 
@@ -43,24 +44,43 @@ impl<T, D> AssetStorage<T, D> where T: Asset<D> {
         AssetStorage {
             assets: Vec::new(),
             free_indices: Arc::new(RwLock::new(Vec::new())),
+            names: HashMap::new(),
             marker: PhantomData,
         }
     }
 
-    pub fn add(&mut self, asset: T) -> Handle<T> {
+    pub fn get_named(&self, name: &str) -> Option<Handle<T>> {
+        match self.names.get(name) {
+            Some(id) => {
+                Some(Handle {
+                    id: id.clone(),
+                    marker: PhantomData,
+                    free_indices: self.free_indices.clone()
+                })
+            },
+            None => None,
+        }
+    }
+
+    pub fn add(&mut self, asset: T, name: &str) -> Handle<T> {
         match self.free_indices.write().unwrap().pop() {
             Some(id) => {
                 self.assets[id as usize] = Some(asset);
+                let handle = Arc::new(RwLock::new(id));
+                self.names.insert(name.to_string(), handle.clone());
                 Handle {
-                    id: Arc::new(RwLock::new(id)),
+                    id: handle,
                     marker: PhantomData,
                     free_indices: self.free_indices.clone()
                 }
             },
             None => {
                 self.assets.push(Some(asset));
+                let id = self.assets.len() - 1;
+                let handle = Arc::new(RwLock::new(id));
+                self.names.insert(name.to_string(), handle.clone());
                 Handle {
-                    id: Arc::new(RwLock::new(self.assets.len() - 1)),
+                    id: handle,
                     marker: PhantomData,
                     free_indices: self.free_indices.clone()
                 }
diff --git a/src/core/mod.rs b/src/core/mod.rs
index 59e3155311..e8cb882c4a 100644
--- a/src/core/mod.rs
+++ b/src/core/mod.rs
@@ -1,5 +1,8 @@
 use legion::schedule::Stage;
 
+pub mod time;
+pub use time::Time;
+
 #[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
 pub enum ApplicationStage {
     Update,
diff --git a/src/core/time.rs b/src/core/time.rs
new file mode 100644
index 0000000000..fe5cd86177
--- /dev/null
+++ b/src/core/time.rs
@@ -0,0 +1,26 @@
+use std::time::{Duration, Instant};
+
+pub struct Time {
+    pub delta: Duration,
+    pub instant: Instant,
+    pub delta_seconds: f32
+}
+
+impl Time {
+    pub fn new() -> Time {
+        Time {
+            delta: Duration::from_secs(0),
+            instant: Instant::now(),
+            delta_seconds: 0.0,
+        }
+    }
+
+    pub fn start(&mut self) {
+        self.instant = Instant::now();
+    }
+
+    pub fn stop(&mut self) {
+        self.delta = Instant::now() - self.instant;
+        self.delta_seconds = self.delta.as_secs() as f32 + (self.delta.subsec_nanos() as f32 / 1.0e9);
+    }
+}
\ No newline at end of file
diff --git a/src/render/shadow/mod.rs b/src/render/shadow/mod.rs
index 408185f60b..80effce9b3 100644
--- a/src/render/shadow/mod.rs
+++ b/src/render/shadow/mod.rs
@@ -2,7 +2,7 @@ use crate::{render::*, asset::*, LocalToWorld};
 use wgpu::{BindGroupLayout, Buffer, CommandEncoder, Device, VertexBufferDescriptor, SwapChainOutput, SwapChainDescriptor};
 use legion::prelude::*;
 use zerocopy::AsBytes;
-use std::{mem, sync::Arc};
+use std::{mem, sync::Arc, rc::Rc};
 
 pub struct ShadowPass {
     pub pipeline: wgpu::RenderPipeline,
@@ -11,6 +11,7 @@ pub struct ShadowPass {
     pub shadow_texture: wgpu::Texture,
     pub shadow_view: wgpu::TextureView,
     pub shadow_sampler: wgpu::Sampler,
+    pub local_bind_group_layout: Rc<BindGroupLayout>,
     pub light_uniform_buffer: Arc::<UniformBuffer>,
     pub lights_are_dirty: bool,
 }
@@ -47,6 +48,30 @@ impl Pass for ShadowPass {
             );
         }
 
+        for mut material in <Write<Material>>::query().iter(world) {
+            if let None = material.bind_group {
+                let entity_uniform_size = mem::size_of::<MaterialUniforms>() as wgpu::BufferAddress;
+                let uniform_buf = device.create_buffer(&wgpu::BufferDescriptor {
+                    size: entity_uniform_size,
+                    usage: wgpu::BufferUsage::UNIFORM | wgpu::BufferUsage::COPY_DST,
+                });
+
+                let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
+                    layout: &self.local_bind_group_layout,
+                    bindings: &[wgpu::Binding {
+                        binding: 0,
+                        resource: wgpu::BindingResource::Buffer {
+                            buffer: &uniform_buf,
+                            range: 0 .. entity_uniform_size,
+                        },
+                    }],
+                });
+
+                material.bind_group = Some(bind_group);
+                material.uniform_buf = Some(uniform_buf);
+            }
+        }
+
         for (i, (mut light, _)) in <(Write<Light>, Read<LocalToWorld>)>::query().iter(world).enumerate() {
             if let None = light.target_view {
                 light.target_view = Some(self.shadow_texture.create_view(&wgpu::TextureViewDescriptor {
@@ -114,7 +139,7 @@ impl ShadowPass {
         depth: 1,
     };
 
-    pub fn new(device: &Device, _: &World, light_uniform_buffer: Arc::<UniformBuffer>, vertex_buffer_descriptor: VertexBufferDescriptor, local_bind_group_layout: &BindGroupLayout, max_lights: u32) -> ShadowPass {
+    pub fn new(device: &Device, _: &World, light_uniform_buffer: Arc::<UniformBuffer>, vertex_buffer_descriptor: VertexBufferDescriptor, local_bind_group_layout: Rc<BindGroupLayout>, max_lights: u32) -> ShadowPass {
         // Create pipeline layout
         let bind_group_layout =
             device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
@@ -222,6 +247,7 @@ impl ShadowPass {
             shadow_view,
             shadow_sampler,
             light_uniform_buffer,
+            local_bind_group_layout,
             lights_are_dirty: true,
         }
     }
diff --git a/tiny-town/README.md b/tiny-town/README.md
index 7bfd75f916..4075cba7aa 100644
--- a/tiny-town/README.md
+++ b/tiny-town/README.md
@@ -4,6 +4,7 @@
 # run using one of these commands
 # lld linker makes compiles faster
 # rust backtrace gives you a nice backtrace on panics
+# -Zshare-generics=y makes generics slightly faster for some reason
 env RUSTFLAGS="-C link-arg=-fuse-ld=lld" cargo run --release
-env RUSTFLAGS="-C link-arg=-fuse-ld=lld" RUST_BACKTRACE=1 cargo run --release
+env RUSTFLAGS="-C link-arg=-fuse-ld=lld -Zshare-generics=y" RUST_BACKTRACE=1 cargo run --release
 ```
\ No newline at end of file