Deterministic Replication Plugin (src/lib.rs)

Rust utilities for lockstep-style deterministic simulation, state checksum verification, and late-join catch-up in multiplayer game replication. Reuse when building authoritative multiplayer netcode.

// Source: https://github.com/cBournhonesque/lightyear | License: Apache-2.0
// Provided via justclaw.it.com; keep this notice with the code.
//! # Lightyear Deterministic Replication
//!
//! Utilities for lockstep-style deterministic simulation on top of Lightyear:
//! - [`ChecksumPlugin`] registers the checksum protocol and installs the
//!   client/server checksum systems for whichever Lightyear side plugins are
//!   present.
//! - [`ChecksumSendPlugin`] / [`ChecksumReceivePlugin`] compute and verify
//!   XOR checksums of prediction history across client/server or all-to-all P2P topologies.
//! - [`LateJoinCatchUpPlugin`] lets a client that connects mid-game request
//!   a one-time snapshot of a remote entity's state so it can fast-forward
//!   to the current tick via a forced rollb

... (truncated -- full source via MCP)