https://github.com/lucasteles/backdash

C# Rollback network SDK
https://github.com/lucasteles/backdash

fighting-game gamedev ggpo library multiplayer netcode network rollback sdk versus

Last synced: 10 months ago
JSON representation

C# Rollback network SDK

• Host: GitHub
• URL: https://github.com/lucasteles/backdash
• Owner: lucasteles
• License: mit
• Created: 2023-09-11T18:49:26.000Z (over 2 years ago)
• Default Branch: master
• Last Pushed: 2025-03-27T18:38:43.000Z (10 months ago)
• Last Synced: 2025-03-30T02:05:00.971Z (10 months ago)
• Topics: fighting-game, gamedev, ggpo, library, multiplayer, netcode, network, rollback, sdk, versus
• Language: C#
• Homepage: https://lucasteles.github.io/Backdash/
• Size: 8.32 MB
• Stars: 121
• Watchers: 5
• Forks: 4
• Open Issues: 14
• Metadata Files:
  • Readme: README.md
  • Funding: .github/FUNDING.yml

Awesome Lists containing this project

README

          
[![Nuget](https://img.shields.io/nuget/v/Backdash.svg?style=flat)](https://www.nuget.org/packages/Backdash)

![](https://raw.githubusercontent.com/lucasteles/Backdash/site/dotnet_version_badge.svg)

![https://editorconfig.org/](https://img.shields.io/badge/style-EditorConfig-black)

[![CI](https://github.com/lucasteles/Backdash/actions/workflows/ci.yml/badge.svg)](https://github.com/lucasteles/Backdash/actions/workflows/ci.yml)

![](https://raw.githubusercontent.com/lucasteles/Backdash/site/test_report_badge.svg)

![](https://raw.githubusercontent.com/lucasteles/Backdash/site/lines_of_code.svg)

# Backdash 🕹️

[![](assets/images/banner.png)](https://github.com/lucasteles/Backdash)

Highly configurable and extensible implementation

of [Rollback Netcode](https://en.wikipedia.org/wiki/Netcode#Rollback) with full asynchronous IO.

> **Heavily** inspired by [GGPO](https://github.com/pond3r/ggpo).

## Overview

Traditional techniques account for network transmission time by adding delay to a players input, resulting in a

sluggish, laggy game-feel. Rollback networking uses input prediction and speculative execution to send player inputs to

the game immediately, providing the illusion of a zero-latency network. Using rollback, the same timings, reactions,

visual and audio queues, and muscle memory your players build up playing offline will translate directly

online. [Backdash](https://github.com/lucasteles/Backdash) is designed to make incorporating rollback networking (_aka.

Rollback [Netcode](https://words.infil.net/w02-netcode.html)_) into new and existing games as easy as possible.

## Getting started

[NuGet package](https://www.nuget.org/packages/Backdash) available:

```ps

$ dotnet add package Backdash

```

> [!TIP]

> 💡 Please check the **[DOCUMENTATION](https://lucasteles.github.io/Backdash/docs/introduction)** for usage details.

### Demos:

| Title            | Link                                                                                                        |

|------------------|-------------------------------------------------------------------------------------------------------------|

| Terminal         | [![Terminal](https://img.youtube.com/vi/n-3G0AE5Ti0/default.jpg)](https://youtu.be/n-3G0AE5Ti0)             |

| Monogame Local   | [![Monogame Local](https://img.youtube.com/vi/JYf2MemyJaY/default.jpg)](https://youtu.be/JYf2MemyJaY)       |

| Monogame Lobby   | [![Monogame Online](https://img.youtube.com/vi/LGM_9XfzRUI/default.jpg)](https://youtu.be/LGM_9XfzRUI)      |

| Godot Lobby      | [![Godot Online](https://img.youtube.com/vi/8M8QnTiJZzA/default.jpg)](https://youtu.be/8M8QnTiJZzA)         |

| Save/Load Replay | [![Save and load Replay](https://img.youtube.com/vi/iSbOJpLCx5M/default.jpg)](https://youtu.be/iSbOJpLCx5M) |

## Samples

Check the samples on the [/samples](https://github.com/lucasteles/Backdash/tree/master/samples) directory:

There are examples for up to 4 players:

- [Simple console game](https://github.com/lucasteles/Backdash/tree/master/samples/ConsoleGame)

- [Monogame SpaceWar](https://github.com/lucasteles/Backdash/tree/master/samples/SpaceWar) [^2]

- [Monogame SpaceWar with lobby over internet](https://github.com/lucasteles/Backdash/tree/master/samples/SpaceWar.Lobby) [^1][^2]

- [Godot SpaceWar with lobby over internet](https://github.com/lucasteles/BackdashGodotSample)

[^1]: The sample needs a [web server](https://github.com/lucasteles/Backdash/tree/master/samples/LobbyServer) to

exchange players addresses. check the sample `README.md` for more information.

[^2]: If you are using *ARM* *MacOS*

you [may need the x64 version of .NET SDK](https://community.monogame.net/t/tutorial-for-setting-up-monogame-on-m1-m2-apple-silicon/19669)

to build some samples.

## Building from source

You need to have installed [.NET 8 SDK](https://dotnet.microsoft.com/en-us/download)

![](https://raw.githubusercontent.com/lucasteles/Backdash/site/dotnet_version_badge.svg)

1. Clone this repository.

2. Restore tools

    - On root directory run: `dotnet tool restore`

3. Building Library (_root directory_)

    - SDK only: `dotnet nuke build --configuration Release`

        - Alternatively open the solution file `Backdash.sln` on your IDE.

    - SDK and samples `dotnet nuke build-samples --configuration Release`.

        - Alternatively open the solution file `Samples/Backdash.Samples.sln` on your IDE.

## Licensing

[Backdash](https://github.com/lucasteles/Backdash) is available under The MIT License. This

means [Backdash](https://github.com/lucasteles/Backdash) is free for commercial and non-commercial use.

Attribution is not required, but appreciated.