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Good Game, Peace Out Rollback Network SDK

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(日本語ドキュメントはこちら)

What's GGPO?

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. The GGPO networking SDK is designed to make incorporating rollback networking into new and existing games as easy as possible.

For more information about the history of GGPO, check out http://ggpo.net/

This repository contains the code, documentation, and sample applications for the SDK.

Building

Building GGPO is currently only available on Windows, however efforts are being made to port it to other platforms.

Windows

Windows builds requires both Visual Studio 2019 and CMake. Make sure you've installed both before starting. Make sure to add CMake to your path when installing.

  • Run the build_windows.cmd in the root directory of the SDK to generate the Visual Studio 2019 solution files.
  • Open build/GGPO.sln solution for Visual Studio 2019 to compile.

You can also run the cmake-gui tool if you prefer.

Sample Application

The Vector War application in the source directory contains a simple application which uses GGPO to synchronize the two clients. The command line arguments are:

vectorwar.exe  <localport>  <num players> ('local' | <remote ip>:<remote port>) for each player

See the .cmd files in the bin directory for examples on how to start 2, 3, and 4 player games.

Licensing

GGPO is available under The MIT License. This means GGPO is free for commercial and non-commercial use. Attribution is not required, but appreciated.

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  • C++ 79.6%
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  • Batchfile 1.2%