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GGPO (short for Good Game Peace Out) is middleware designed to help create a near-lagless online experience for various emulated arcade games and fighting games. The program was created by Tony Cannon, co-founder of fighting game community site Shoryuken and the popular Evolution Championship Series.
History[editar | editar código-fonte]
Before its creation, GGPO creator Tony Cannon was completely dissatisfied with the 2006 Xbox 360 re-release of Street Fighter II: Hyper Fighting after experiencing its criticized online capabilities.[1] As a reaction to its service, Cannon began development on GGPO and released the first version in late 2006. Cannon later demonstrated GGPO to Capcom, which was positively received.[2]
The downloadable GGPO client supported many games from Capcom and SNK, including Super Street Fighter II Turbo, The King of Fighters 2002, and Metal Slug X through the use of a built-in emulador. Video game companies have also implemented a licensed version of GGPO. Games using it include Skullgirls and Street Fighter III: 3rd Strike Online Edition.[1][3]
On October 9th, 2019 Cannon announced on his Twitter account that GGPO was now open source and available under the MIT License.[4]
Design[editar | editar código-fonte]
GGPO uses a netcode technique called “rollback”. Rather than waiting for input to be received from other players before simulating the next frame, GGPO predicts the inputs they will send and simulates the next frame without delay using that assumption. When other players’ inputs arrive, if any input didn’t match the prediction, GGPO rolls back the state of the game to the last correct state, then replays all players’ revised inputs back until the current frame. The hope is that the predictions will be correct most of the time, allowing smooth play with minimal sudden changes to the game state.[5][6] The system in itself is highly similar to client-side prediction, but applied to a peer-to-peer setup.
The client program can allow players to manually adjust native input delay in high-ping situations, either creating a possibly-jerky yet accurate representation or a smoother game with input delay.
GGPO client[editar | editar código-fonte]
GGPO was originally bundled with a client which enabled users to play supported games online with other players. A matchmaking system allowed players to request challenges from other users, while non-participants could spectate the match and chat. Once a challenge initiated, the match ran a ROM through its prepackaged emulator, FinalBurn Alpha. This client was discontinued, and superseded by other clients which make use of GGPO's networking middleware, such as Fightcade or RedGGPO.
Games using GGPO[editar | editar código-fonte]
Games using rollback networking[editar | editar código-fonte]
See also[editar | editar código-fonte]
Notes[editar | editar código-fonte]
References[editar | editar código-fonte]
- ↑ a b Orland, Kyle (22 de abril de 2011). «Interview: How A Fighting Game Fan Solved Internet Latency Issues». Gamasutra. Consultado em 23 de abril de 2011
- ↑ «GGPO Networking Guru Talks SF HD Remix!». Capcom. Consultado em 21 de junho de 2011
- ↑ Heart, Adam (6 June 2011). «Street Fighter III: 3rd Strike Online – 1st Trailer and Screens». Shoryuken. Consultado em 6 June 2011.
Street Fighter III Third Strike Online Edition will be using GGPO netcode ...
Verifique data em:|acessodata=, |data=(ajuda) - ↑ @Pond3r (9 de outubro de 2019). «GGPO has a new home and is now available under the MIT License. Get it here!: t.co/7KXHGQ7OMN» (Tweet) – via Twitter
- ↑ Miller, Patrick. «The lag-fighting techniques behind GGPO's netcode». Gamasutra. Consultado em 19 August 2016 Verifique data em:
|acessodata=(ajuda) - ↑ Cannon, Tony (September 2012). «Fight the Lag!». Game Developer Magazine. Consultado em 12 September 2012 Verifique data em:
|acessodata=, |data=(ajuda)
External links[editar | editar código-fonte]
- Nenhuma URL encontrada. Por favor especifique uma URL aqui ou adicione uma no Wikidata.
- ggpo no GitHub
Category:Middleware Category:PlayStation 3 software Category:Video game emulation Category:Xbox 360 software Category:Free and open-source software