Added Sensible Default ggrs::Config type GgrsConfig

examples/box_game/box_game.rs

@@ -1,10 +1,10 @@
 use bevy::{prelude::*, utils::HashMap};
 use bevy_ggrs::{
-    AddRollbackCommandExtension, LocalInputs, LocalPlayers, PlayerInputs, Rollback, Session,
+    AddRollbackCommandExtension, GgrsConfig, LocalInputs, LocalPlayers, PlayerInputs, Rollback,
+    Session,
 };
 use bytemuck::{Pod, Zeroable};
-use ggrs::Config;
-use std::{hash::Hash, net::SocketAddr};
+use std::hash::Hash;
 
 const BLUE: Color = Color::rgb(0.8, 0.6, 0.2);
 const ORANGE: Color = Color::rgb(0., 0.35, 0.8);
@@ -23,18 +23,12 @@ const FRICTION: f32 = 0.9;
 const PLANE_SIZE: f32 = 5.0;
 const CUBE_SIZE: f32 = 0.2;
 
-/// You need to define a config struct to bundle all the generics of GGRS. You can safely ignore `State` and leave it as u8 for all GGRS functionality.
-/// TODO: Find a way to hide the state type.
-#[derive(Debug)]
-pub struct GgrsConfig;
-impl Config for GgrsConfig {
-    type Input = BoxInput;
-    type State = u8;
-    type Address = SocketAddr;
-}
+// You need to define a config struct to bundle all the generics of GGRS. bevy_ggrs provides a sensible default in `GgrsConfig`.
+// (optional) You can define a type here for brevity.
+pub type BoxConfig = GgrsConfig<BoxInput>;
 
 #[repr(C)]
-#[derive(Copy, Clone, PartialEq, Eq, Pod, Zeroable)]
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Pod, Zeroable)]
 pub struct BoxInput {
     pub inp: u8,
 }
@@ -85,14 +79,14 @@ pub fn read_local_inputs(
         local_inputs.insert(*handle, BoxInput { inp: input });
     }
 
-    commands.insert_resource(LocalInputs::<GgrsConfig>(local_inputs));
+    commands.insert_resource(LocalInputs::<BoxConfig>(local_inputs));
 }
 
 pub fn setup_system(
     mut commands: Commands,
     mut meshes: ResMut<Assets<Mesh>>,
     mut materials: ResMut<Assets<StandardMaterial>>,
-    session: Res<Session<GgrsConfig>>,
+    session: Res<Session<BoxConfig>>,
 ) {
     let num_players = match &*session {
         Session::SyncTest(s) => s.num_players(),
@@ -166,7 +160,7 @@ pub fn increase_frame_system(mut frame_count: ResMut<FrameCount>) {
 #[allow(dead_code)]
 pub fn move_cube_system(
     mut query: Query<(&mut Transform, &mut Velocity, &Player), With<Rollback>>,
-    inputs: Res<PlayerInputs<GgrsConfig>>,
+    inputs: Res<PlayerInputs<BoxConfig>>,
 ) {
     for (mut t, mut v, p) in query.iter_mut() {
         let input = inputs[p.handle].0.inp;

examples/box_game/box_game_p2p.rs

@@ -30,7 +30,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     assert!(num_players > 0);
 
     // create a GGRS session
-    let mut sess_build = SessionBuilder::<GgrsConfig>::new()
+    let mut sess_build = SessionBuilder::<BoxConfig>::new()
         .with_num_players(num_players)
         .with_desync_detection_mode(ggrs::DesyncDetection::On { interval: 10 }) // (optional) set how often to exchange state checksums
         .with_max_prediction_window(12) // (optional) set max prediction window
@@ -58,7 +58,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     let sess = sess_build.start_p2p_session(socket)?;
 
     App::new()
-        .add_plugins(GgrsPlugin::<GgrsConfig>::default())
+        .add_plugins(GgrsPlugin::<BoxConfig>::default())
         // define frequency of rollback game logic update
         .set_rollback_schedule_fps(FPS)
         // this system will be executed as part of input reading
@@ -95,7 +95,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     Ok(())
 }
 
-fn print_events_system(mut session: ResMut<Session<GgrsConfig>>) {
+fn print_events_system(mut session: ResMut<Session<BoxConfig>>) {
     match session.as_mut() {
         Session::P2P(s) => {
             for event in s.events() {
@@ -115,7 +115,7 @@ fn print_events_system(mut session: ResMut<Session<GgrsConfig>>) {
 fn print_network_stats_system(
     time: Res<Time>,
     mut timer: ResMut<NetworkStatsTimer>,
-    p2p_session: Option<Res<Session<GgrsConfig>>>,
+    p2p_session: Option<Res<Session<BoxConfig>>>,
 ) {
     // print only when timer runs out
     if timer.0.tick(time.delta()).just_finished() {

examples/box_game/box_game_spectator.rs

@@ -31,12 +31,12 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     // create a GGRS session
 
     let socket = UdpNonBlockingSocket::bind_to_port(opt.local_port)?;
-    let sess = SessionBuilder::<GgrsConfig>::new()
+    let sess = SessionBuilder::<BoxConfig>::new()
         .with_num_players(opt.num_players)
         .start_spectator_session(opt.host, socket);
 
     App::new()
-        .add_plugins(GgrsPlugin::<GgrsConfig>::default())
+        .add_plugins(GgrsPlugin::<BoxConfig>::default())
         // define frequency of rollback game logic update
         .set_rollback_schedule_fps(FPS)
         // this system will be executed as part of input reading
@@ -66,7 +66,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     Ok(())
 }
 
-fn print_events_system(mut session: ResMut<Session<GgrsConfig>>) {
+fn print_events_system(mut session: ResMut<Session<BoxConfig>>) {
     match session.as_mut() {
         Session::Spectator(s) => {
             for event in s.events() {
@@ -80,7 +80,7 @@ fn print_events_system(mut session: ResMut<Session<GgrsConfig>>) {
 fn print_network_stats_system(
     time: Res<Time>,
     mut timer: ResMut<NetworkStatsTimer>,
-    p2p_session: Option<Res<Session<GgrsConfig>>>,
+    p2p_session: Option<Res<Session<BoxConfig>>>,
 ) {
     // print only when timer runs out
     if timer.0.tick(time.delta()).just_finished() {

examples/box_game/box_game_synctest.rs

@@ -22,7 +22,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     assert!(opt.num_players > 0);
 
     // create a GGRS session
-    let mut sess_build = SessionBuilder::<GgrsConfig>::new()
+    let mut sess_build = SessionBuilder::<BoxConfig>::new()
         .with_num_players(opt.num_players)
         .with_check_distance(opt.check_distance)
         .with_input_delay(2); // (optional) set input delay for the local player
@@ -36,7 +36,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     let sess = sess_build.start_synctest_session()?;
 
     App::new()
-        .add_plugins(GgrsPlugin::<GgrsConfig>::default())
+        .add_plugins(GgrsPlugin::<BoxConfig>::default())
         // define frequency of rollback game logic update
         .set_rollback_schedule_fps(FPS)
         // this system will be executed as part of input reading

src/lib.rs

@@ -9,7 +9,7 @@ use bevy::{
 };
 use ggrs::{Config, InputStatus, P2PSession, PlayerHandle, SpectatorSession, SyncTestSession};
 use parking_lot::RwLock;
-use std::{marker::PhantomData, sync::Arc};
+use std::{fmt::Debug, hash::Hash, marker::PhantomData, net::SocketAddr, sync::Arc};
 use world_snapshot::RollbackSnapshots;
 
 pub use ggrs;
@@ -22,12 +22,33 @@ pub(crate) mod world_snapshot;
 
 pub mod prelude {
     pub use crate::{
-        AddRollbackCommandExtension, GgrsApp, GgrsPlugin, GgrsSchedule, PlayerInputs, ReadInputs,
-        Rollback, Session,
+        AddRollbackCommandExtension, GgrsApp, GgrsConfig, GgrsPlugin, GgrsSchedule, PlayerInputs,
+        ReadInputs, Rollback, Session,
     };
     pub use ggrs::{GGRSEvent as GgrsEvent, PlayerType, SessionBuilder};
 }
 
+/// A sensible default [GGRS Config](`ggrs::Config`) type suitable for most applications.
+///
+/// If you require a more specialized configuration, you can create your own type implementing
+/// [`Config`](`ggrs::Config`).
+#[derive(Debug)]
+pub struct GgrsConfig<Input, Address = SocketAddr, State = u8> {
+    _phantom: PhantomData<(Input, Address, State)>,
+}
+
+impl<Input, Address, State> Config for GgrsConfig<Input, Address, State>
+where
+    Self: 'static,
+    Input: Send + Sync + PartialEq + bytemuck::Pod,
+    Address: Send + Sync + Debug + Hash + Eq + Clone,
+    State: Send + Sync + Clone,
+{
+    type Input = Input;
+    type State = State;
+    type Address = Address;
+}
+
 const DEFAULT_FPS: usize = 60;
 
 #[derive(ScheduleLabel, Debug, Hash, PartialEq, Eq, Clone)]