shells

Cargo.toml

@@ -3,7 +3,13 @@ name = "time_travel"
 version = "0.1.0"
 edition = "2024"
 
+[features]
+default = ["client", "server"]
+client = []
+server = []
+
 [dependencies]
 avian2d = "0.5.0"
 bevy = "0.18.0"
-bevy_egui = "0.39.1"
+clap = { version = "4.5.56", features = ["derive"] }
+

src/cli.rs

@@ -0,0 +1,27 @@
+use clap::{Parser, Subcommand};
+
+#[derive(Parser, Debug)]
+#[command(author, version, about)]
+pub struct Cli {
+    #[command(subcommand)]
+    pub mode: Option<Mode>,
+}
+
+#[derive(Subcommand, Debug, Default)]
+pub enum Mode {
+    /// Run a headless server (no rendering)
+    #[cfg(feature = "server")]
+    #[cfg_attr(all(feature = "server", not(feature = "client")), default)]
+    Headless,
+    /// Run a server that renders
+    #[cfg(feature = "server")]
+    Server,
+    /// Run the client application
+    #[cfg(feature = "client")]
+    #[cfg_attr(all(feature = "client", not(feature = "server")), default)]
+    Client,
+    /// Run both client and server in one process
+    #[cfg(all(feature = "client", feature = "server"))]
+    #[cfg_attr(all(feature = "client", feature = "server"), default)]
+    Host,
+}

src/main.rs

@@ -1,29 +1,75 @@
-use crate::avian::{CharacterControllerBundle, CharacterControllerPlugin};
+use crate::{
+    avian::{CharacterControllerBundle, CharacterControllerPlugin},
+    cli::Cli,
+};
 use avian2d::{
     PhysicsPlugins,
     math::Vector,
     prelude::{Collider, Gravity, RigidBody},
 };
 use bevy::{camera::ScalingMode, color::palettes::css::GREEN, prelude::*};
-use bevy_egui::{EguiContexts, EguiPlugin, EguiPrimaryContextPass, egui};
+use clap::Parser;
 
 pub mod avian;
+pub mod cli;
+pub mod net;
 
 fn main() {
-    App::new()
+    let cli = match Cli::try_parse() {
-        .add_plugins((
+        Ok(cli) => cli,
-            DefaultPlugins,
+        Err(err) => {
-            EguiPlugin::default(),
+            err.print().expect("failed to print clap error");
-            // Add physics plugins and specify a units-per-meter scaling factor, 1 meter = 20 pixels.
+            std::process::exit(1);
-            // The unit allows the engine to tune its parameters for the scale of the world, improving stability.
+        }
-            PhysicsPlugins::default().with_length_unit(20.0),
+    };
-            CharacterControllerPlugin,
+
-        ))
+    #[cfg(all(feature = "client", not(feature = "server")))]
-        .add_systems(Startup, setup)
+    let mode = cli.mode.unwrap_or(cli::Mode::Client);
-        .add_systems(Update, debug_border)
+    #[cfg(all(feature = "server", not(feature = "client")))]
-        .add_systems(EguiPrimaryContextPass, connection_ui)
+    let mode = cli.mode.unwrap_or(cli::Mode::Server);
-        .insert_resource(Gravity(Vector::ZERO))
+    #[cfg(all(feature = "client", feature = "server"))]
-        .run();
+    let mode = cli.mode.unwrap_or(cli::Mode::Host);
+    #[cfg(all(not(feature = "client"), not(feature = "server")))]
+    panic!("You must enable either the client or server feature");
+
+    let mut app = App::new();
+
+    match mode {
+        #[cfg(feature = "server")]
+        cli::Mode::Headless => {
+            app.add_plugins((MinimalPlugins, net::server::GameServerPlugin));
+        }
+
+        #[cfg(feature = "server")]
+        cli::Mode::Server => {
+            app.add_plugins((DefaultPlugins, net::server::GameServerPlugin));
+        }
+
+        #[cfg(feature = "client")]
+        cli::Mode::Client => {
+            app.add_plugins((DefaultPlugins, net::client::GameClientPlugin));
+        }
+
+        #[cfg(all(feature = "client", feature = "server"))]
+        cli::Mode::Host => {
+            app.add_plugins((
+                DefaultPlugins,
+                net::server::GameServerPlugin,
+                net::client::GameClientPlugin,
+            ));
+        }
+    }
+
+    app.add_plugins((
+        // Add physics plugins and specify a units-per-meter scaling factor, 1 meter = 20 pixels.
+        // The unit allows the engine to tune its parameters for the scale of the world, improving stability.
+        PhysicsPlugins::default().with_length_unit(20.0),
+        CharacterControllerPlugin,
+    ))
+    .add_systems(Startup, setup)
+    .add_systems(Update, debug_border)
+    .insert_resource(Gravity(Vector::ZERO))
+    .run();
 }
 
 fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
@@ -57,12 +103,3 @@ fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
 fn debug_border(mut gizmos: Gizmos) {
     gizmos.rect_2d(Isometry2d::IDENTITY, Vec2::new(1920., 1080.), GREEN);
 }
-
-fn connection_ui(mut contexts: EguiContexts) -> Result {
-    let mut text = String::from("hello");
-    egui::Window::new("Connection").show(contexts.ctx_mut()?, |ui| {
-        ui.label("connection:");
-        ui.text_edit_singleline(&mut text)
-    });
-    Ok(())
-}

src/net/client.rs

@@ -0,0 +1,18 @@
+use bevy::prelude::*;
+
+pub struct GameClientPlugin;
+
+impl Plugin for GameClientPlugin {
+    fn build(&self, app: &mut App) {
+        // app.add_systems(
+        //     FixedPreUpdate,
+        //     // Inputs have to be buffered in the WriteClientInputs set
+        //     buffer_input.in_set(InputSystems::WriteClientInputs),
+        // );
+        // app.add_systems(FixedUpdate, player_movement);
+
+        // app.add_systems(Update, receive_message1);
+        // app.add_observer(handle_predicted_spawn);
+        // app.add_observer(handle_interpolated_spawn);
+    }
+}

src/net/mod.rs

@@ -0,0 +1,6 @@
+#[cfg(feature = "client")]
+pub mod client;
+pub mod protocol;
+#[cfg(feature = "server")]
+pub mod server;
+pub mod shared;

src/net/protocol.rs

@@ -0,0 +1,30 @@
+use bevy::prelude::*;
+
+#[derive(Clone)]
+pub struct ProtocolPlugin;
+
+impl Plugin for ProtocolPlugin {
+    fn build(&self, app: &mut App) {
+        // messages
+        app.register_message::<Message1>()
+            .add_direction(NetworkDirection::ServerToClient);
+
+        // inputs
+        app.add_plugins(input::native::InputPlugin::<Inputs>::default());
+        // components
+        app.register_component::<PlayerId>();
+
+        app.register_component::<PlayerPosition>()
+            .add_prediction()
+            .add_linear_interpolation();
+
+        app.register_component::<PlayerColor>();
+
+        // channels
+        app.add_channel::<Channel1>(ChannelSettings {
+            mode: ChannelMode::OrderedReliable(ReliableSettings::default()),
+            ..default()
+        })
+        .add_direction(NetworkDirection::ServerToClient);
+    }
+}

src/net/server.rs

@@ -0,0 +1,13 @@
+use bevy::prelude::*;
+
+pub struct GameServerPlugin;
+
+impl Plugin for GameServerPlugin {
+    fn build(&self, app: &mut App) {
+        // // the physics/FixedUpdates systems that consume inputs should be run in this set.
+        // app.add_systems(FixedUpdate, movement);
+        // app.add_observer(handle_new_client);
+        // app.add_observer(handle_connected);
+        // app.add_systems(Update, send_message);
+    }
+}

src/net/shared.rs

@@ -0,0 +1 @@
+