Difference between revisions of "Version emulation"
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{{ParentArticle|[[Game logic]]}} | {{ParentArticle|[[Game logic]]}} | ||
| − | Leading up to [[Worms Armageddon ReadMe (English)/v3.6.19.7 Beta Update|WA beta update v3.6.19.7]] (2004.02.09), Deadcode determined that it was necessary to maintain [[w:Backward compatibility|backward compatibility]] with previous beta versions of WA to avoid segmenting the WA community. | + | Leading up to [[Worms Armageddon ReadMe (English)/v3.6.19.7 Beta Update|WA beta update v3.6.19.7]] (2004.02.09), Deadcode determined that it was necessary to maintain [[w:Backward compatibility|backward compatibility]] with previous beta versions of WA to avoid segmenting the WA community. To achieve this, he implemented emulation of all the previous WA beta versions. Later, in <TODO: insert version number and date here>, emulation of version 3.0 was also added. |
== Picking the emulated version == | == Picking the emulated version == | ||
Revision as of 20:09, 28 March 2013
Leading up to WA beta update v3.6.19.7 (2004.02.09), Deadcode determined that it was necessary to maintain backward compatibility with previous beta versions of WA to avoid segmenting the WA community. To achieve this, he implemented emulation of all the previous WA beta versions. Later, in <TODO: insert version number and date here>, emulation of version 3.0 was also added.
Picking the emulated version
In an online game with a mixture of players using different versions, the oldest version is the one emulated. So if someone joining a game using v3.6.31.0, and one of the players uses v3.6.29.0 and all other players use v3.7.2.1, then v3.6.29.0 would be emulated, because it is the highest version everyone would be able to emulate.
But there are some exceptions to that: if a host detects that some players in the game would improperly emulate the version that should be emulated (according to logic described above), then an older version is emulated. For example, v3.6.20.2 has an improper v3.6.20.1 emulation, and this case is handled in v3.6.20.3+. Thus, if, in a game hosted with v3.6.20.3+, there is a mixture of v3.6.20.1 and v3.6.20.2 players (and no older version is used), then the host would force emulating v3.6.19.19 rather than v3.6.20.1, in order to prevent v3.6.20.2 players from desynchronizing.
Similarly, there is backward compatibility but not forward compatibility when reading replay files. Thus, for example, a v3.6.31.0 user can watch replays recorded by W:A v3.6.31.0 or prior, but not those recorded with versions later than v3.6.31.0.
