Files
shinespark/src/replay.rs
T
2026-09-12 14:55:40 +02:00

410 lines
12 KiB
Rust

//! Deterministic input recording and playback.
use std::{
collections::BTreeMap,
fs,
path::{Path, PathBuf},
};
use bevy::prelude::*;
use bevy_ggrs::{PlayerInputs, RollbackFrameCount, SaveWorld, prelude::*};
use clap::ValueEnum;
use serde::{Deserialize, Serialize};
use crate::{
AppState,
args::Args,
input::FighterInputFrame,
match_loading::{MatchPlayer, PendingMatch},
netcode::GGRSCfg,
schedule::GameplaySet,
};
const MAGIC: &[u8; 8] = b"SPRPLY01";
pub const REPLAY_VERSION: u32 = 1;
#[derive(Clone, Copy, Debug, Default, Eq, PartialEq, ValueEnum)]
pub enum ReplayFormat {
#[default]
Binary,
Json,
}
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct Replay {
pub replay_version: u32,
pub game_version: String,
pub match_config: ReplayMatch,
pub frames: Vec<ReplayFrame>,
pub checksums: Vec<ReplayChecksum>,
}
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct ReplayMatch {
pub stage: crate::stage::manifest::StageId,
pub players: Vec<MatchPlayer>,
}
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct ReplayFrame {
pub frame: i32,
pub inputs: Vec<FighterInputFrame>,
}
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct ReplayChecksum {
pub frame: i32,
pub checksum: u128,
}
#[derive(Resource)]
pub struct LoadedReplay(pub Replay);
#[derive(Resource)]
pub struct ReplayComplete;
#[derive(Resource, Default)]
pub struct StopReplayRecording;
enum ReplayMode {
Record { path: PathBuf, format: ReplayFormat },
Playback { replay: Replay, mismatch: bool },
}
#[derive(Resource)]
struct ReplayRuntime {
mode: ReplayMode,
frames: BTreeMap<i32, Vec<FighterInputFrame>>,
checksums: BTreeMap<i32, u128>,
finished: bool,
}
pub struct ReplayPlugin;
impl Plugin for ReplayPlugin {
fn build(&self, app: &mut App) {
app.add_systems(OnEnter(AppState::InMatch), start_replay)
.add_systems(
GgrsSchedule,
replay_inputs
.in_set(GameplaySet::Input)
.before(crate::input::buffer::postprocess_input),
)
.add_systems(
SaveWorld,
record_checksum
.after(SaveWorldSystems::Checksum)
.before(SaveWorldSystems::Snapshot),
)
.add_systems(OnExit(AppState::InMatch), finish_recording)
.add_systems(Update, stop_recording.run_if(in_state(AppState::InMatch)))
.add_systems(Update, finish_playback.run_if(in_state(AppState::InMatch)));
}
}
pub fn load(path: &Path) -> Result<Replay, String> {
let bytes = fs::read(path)
.map_err(|error| format!("cannot read replay {}: {error}", path.display()))?;
let replay = if bytes.starts_with(MAGIC) {
if bytes.len() < MAGIC.len() + 4 {
return Err("replay binary header is truncated".into());
}
let version = u32::from_le_bytes(bytes[8..12].try_into().unwrap());
if version != REPLAY_VERSION {
return Err(format!("unsupported replay version {version}"));
}
bincode::deserialize(&bytes[12..])
.map_err(|error| format!("invalid binary replay: {error}"))?
} else {
serde_json::from_slice(&bytes).map_err(|error| format!("invalid JSON replay: {error}"))?
};
validate(&replay)?;
Ok(replay)
}
pub fn save(path: &Path, format: ReplayFormat, replay: &Replay) -> Result<(), String> {
validate(replay)?;
let bytes = match format {
ReplayFormat::Binary => {
let mut bytes = MAGIC.to_vec();
bytes.extend(REPLAY_VERSION.to_le_bytes());
bytes.extend(
bincode::serialize(replay)
.map_err(|error| format!("cannot encode replay: {error}"))?,
);
bytes
}
ReplayFormat::Json => serde_json::to_vec_pretty(replay)
.map_err(|error| format!("cannot encode replay JSON: {error}"))?,
};
let temporary = path.with_extension("replay.tmp");
fs::write(&temporary, bytes).map_err(|error| format!("cannot write replay: {error}"))?;
fs::rename(&temporary, path).map_err(|error| format!("cannot finalize replay: {error}"))
}
fn validate(replay: &Replay) -> Result<(), String> {
if replay.replay_version != REPLAY_VERSION {
return Err(format!(
"unsupported replay version {}",
replay.replay_version
));
}
if replay.players_are_invalid() {
return Err("replay player handles must cover 0..player_count".into());
}
if replay.frames.is_empty() {
return Err("replay must contain at least one frame".into());
}
if replay
.frames
.windows(2)
.any(|frames| frames[0].frame >= frames[1].frame)
{
return Err("replay frames must be strictly ordered".into());
}
if replay
.frames
.iter()
.any(|frame| frame.inputs.len() != replay.match_config.players.len())
{
return Err("replay frame input count does not match player count".into());
}
Ok(())
}
impl Replay {
fn players_are_invalid(&self) -> bool {
let mut handles: Vec<_> = self
.match_config
.players
.iter()
.map(|player| player.handle)
.collect();
handles.sort_unstable();
handles != (0..handles.len()).collect::<Vec<_>>()
}
}
fn start_replay(mut commands: Commands, args: Res<Args>, loaded: Option<Res<LoadedReplay>>) {
let mode = if let Some(replay) = loaded {
ReplayMode::Playback {
replay: replay.0.clone(),
mismatch: false,
}
} else if let Some(path) = args.record_replay.clone() {
ReplayMode::Record {
path,
format: args.replay_format,
}
} else {
return;
};
commands.insert_resource(ReplayRuntime {
mode,
frames: BTreeMap::new(),
checksums: BTreeMap::new(),
finished: false,
});
}
fn replay_inputs(
mut inputs: ResMut<PlayerInputs<GGRSCfg>>,
frame: Res<RollbackFrameCount>,
runtime: Option<ResMut<ReplayRuntime>>,
) {
let Some(mut runtime) = runtime else { return };
match &mut runtime.mode {
ReplayMode::Record { .. } => {
runtime
.frames
.insert(frame.0, inputs.iter().map(|(input, _)| *input).collect());
}
ReplayMode::Playback { replay, mismatch } if !*mismatch => {
let Some(recorded) = replay
.frames
.iter()
.find(|recorded| recorded.frame == frame.0)
else {
error!("Replay has no input for frame {}", frame.0);
*mismatch = true;
return;
};
for ((input, _), recorded) in inputs.iter_mut().zip(&recorded.inputs) {
*input = *recorded;
}
}
ReplayMode::Playback { .. } => {}
}
}
fn record_checksum(
frame: Res<RollbackFrameCount>,
checksum: Res<Checksum>,
runtime: Option<ResMut<ReplayRuntime>>,
) {
let Some(mut runtime) = runtime else { return };
if matches!(&runtime.mode, ReplayMode::Record { .. }) {
runtime.checksums.insert(frame.0, checksum.0);
} else if let ReplayMode::Playback { replay, mismatch } = &mut runtime.mode {
if let Some(expected) = replay
.checksums
.iter()
.find(|value| value.frame == frame.0)
.map(|value| value.checksum)
{
if expected != checksum.0 {
error!(
"Replay desync at frame {}: expected {:X}, got {:X}",
frame.0, expected, checksum.0
);
*mismatch = true;
}
}
}
}
fn stop_recording(
mut commands: Commands,
stop_request: Option<Res<StopReplayRecording>>,
runtime: Option<ResMut<ReplayRuntime>>,
request: Option<Res<PendingMatch>>,
) {
if stop_request.is_none() {
return;
}
commands.remove_resource::<StopReplayRecording>();
finish_recording_inner(&mut commands, runtime, request);
}
fn finish_recording(
mut commands: Commands,
runtime: Option<ResMut<ReplayRuntime>>,
request: Option<Res<PendingMatch>>,
) {
finish_recording_inner(&mut commands, runtime, request);
}
fn finish_recording_inner(
commands: &mut Commands,
runtime: Option<ResMut<ReplayRuntime>>,
request: Option<Res<PendingMatch>>,
) {
let Some(mut runtime) = runtime else { return };
let ReplayMode::Record { path, format } = &runtime.mode else {
return;
};
if runtime.finished || runtime.frames.is_empty() {
return;
}
let Some(request) = request else { return };
let path = path.clone();
let format = *format;
let replay = Replay {
replay_version: REPLAY_VERSION,
game_version: env!("CARGO_PKG_VERSION").into(),
match_config: ReplayMatch {
stage: request.stage,
players: request.players.clone(),
},
frames: runtime
.frames
.iter()
.map(|(&frame, inputs)| ReplayFrame {
frame,
inputs: inputs.clone(),
})
.collect(),
checksums: runtime
.checksums
.iter()
.map(|(&frame, &checksum)| ReplayChecksum { frame, checksum })
.collect(),
};
if let Err(error) = save(&path, format, &replay) {
error!("Failed to save replay: {error}");
}
runtime.finished = true;
commands.remove_resource::<ReplayRuntime>();
}
fn finish_playback(
mut commands: Commands,
mut next_state: ResMut<NextState<AppState>>,
frame: Res<RollbackFrameCount>,
runtime: Option<Res<ReplayRuntime>>,
) {
let Some(runtime) = runtime else { return };
let ReplayMode::Playback { replay, mismatch } = &runtime.mode else {
return;
};
if *mismatch
|| replay
.frames
.last()
.is_some_and(|last| frame.0 >= last.frame)
{
commands.remove_resource::<ReplayRuntime>();
commands.remove_resource::<LoadedReplay>();
commands.insert_resource(ReplayComplete);
next_state.set(AppState::PreMainMenu);
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::{
fighter::FighterId,
match_loading::MatchPlayer,
math::{int::FGi32, vec::FGVec2},
stage::manifest::StageId,
};
fn sample() -> Replay {
Replay {
replay_version: REPLAY_VERSION,
game_version: "test".into(),
match_config: ReplayMatch {
stage: StageId::TestStage,
players: vec![MatchPlayer {
handle: 0,
fighter: FighterId::TestFighter,
}],
},
frames: vec![ReplayFrame {
frame: 1,
inputs: vec![FighterInputFrame {
movement: FGVec2::new(FGi32::from_num(1), FGi32::ZERO),
..default()
}],
}],
checksums: vec![ReplayChecksum {
frame: 1,
checksum: 42,
}],
}
}
#[test]
fn binary_and_json_round_trip() {
let replay = sample();
let directory = std::env::temp_dir();
let binary = directory.join(format!("game-test-replay-{}.bin", std::process::id()));
let json = directory.join(format!("game-test-replay-{}.json", std::process::id()));
save(&binary, ReplayFormat::Binary, &replay).unwrap();
save(&json, ReplayFormat::Json, &replay).unwrap();
assert_eq!(load(&binary).unwrap(), replay);
assert_eq!(load(&json).unwrap(), replay);
let _ = fs::remove_file(binary);
let _ = fs::remove_file(json);
}
#[test]
fn malformed_frame_input_count_is_rejected() {
let mut replay = sample();
replay.frames[0].inputs.clear();
assert!(validate(&replay).is_err());
}
}