local-transport

Local Transport Demo

A browser-based demo that simulates multiple players locally using LocalTransport. No server required—everything runs in a single browser tab.

See examples/README.md for quick start instructions.

Live demo: https://someusername6.github.io/rollback-netcode

Features

• Add/remove players dynamically (up to 16)
• Switch between Star and Mesh topologies
• Adjust simulated latency and jitter in real-time
• Induce desyncs to observe detection and recovery
• View RTT and rollback statistics per player

How It Works

This demo uses LocalTransport to simulate network connections between players without actual network traffic. Messages are queued and delivered after a configurable delay to simulate latency.

Key Concepts Demonstrated

1. Topology (Star vs Mesh)

   • Star: All clients connect only to the host. Host relays messages. Lower bandwidth but host is single point of failure.
   • Mesh: All clients connect to each other directly. More bandwidth but more resilient.

2. Desync Authority (Host vs Peer)

   • Host: Only the host checks for desyncs by comparing state hashes.
   • Peer: All peers check for desyncs independently.

3. Rollback

   • When a player's input arrives late, the library restores a snapshot, re-simulates with correct inputs, and continues. This happens automatically.

4. Simulated Latency

   • Adjust the latency slider to see how the rollback system handles delayed inputs. Higher latency = more rollbacks.

Files

• demo.ts - Main demo logic (DemoManager class)
• game.ts - DotGame implementation (colored dots that move with arrow keys)
• index.html - UI with control panel
• styles.css - Styling