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source port
A source port is a software project based on the source code of a game engine that allows the game to be played on operating systems or computing platforms with which the game was not originally compatible.
==Description==
Source ports are often created by fans after the original developer hands over the maintenance support for a game by releasing its source code to the public (see List of commercial video games with later released source code). The term was coined after the release of the source code to Doom. Due to copyright issues concerning the sound library used by original DOS version, id Software released only the source code to the Linux version of the game. Since the majority of Doom players were DOS users the first step for a fan project was to ''port'' the Linux ''source'' code to DOS.〔(【引用サイトリンク】title=Source Ports )〕 A legitimate source port includes only the engine portion of the game and require that the data files of the game in question already be present on users' systems. Source ports are in no way meant to encourage copyright infringement of software.
Source ports share the similarity with unofficial patches that both don't change the original gameplay as such projects are by definition mods. However many source ports add support for gameplay mods, which is usually optional (e.g. DarkPlaces consists of a source port engine and a gameplay mod that are even distributed separately〔(【引用サイトリンク】title=LordHavoc's DarkPlaces Quake Modification: Downloads )〕). While the primary goal of any source port is compatibility with newer hardware, many projects support other enhancements. Common examples of additions include support for higher video resolutions and different aspect ratios, hardware accelerated renderers (OpenGL and/or Direct3D), enhanced input support (including the ability to map controls onto additional input devices), 3D character models (in case of 2.5D games), higher resolution textures, support to replace MIDI with digital audio (MP3, Ogg Vorbis, etc.), and enhanced multiplayer support using the Internet.
Several source ports have been created for various games specifically to address online multiplayer support. Most older games were not created to take advantage of the Internet and the low latency, high bandwidth Internet connections available to computer gamers today. Furthermore, old games may use outdated network protocols to create multiplayer connections, such as IPX protocol, instead of Internet Protocol. Another problem was games that required a specific IP address for connecting with another player. This requirement made it difficult to quickly find a group of strangers to play with — the way that online games are most commonly played today. To address this shortcoming, specific source ports such as Skulltag added "lobbies", which are basically integrated chat rooms in which players can meet and post the location of games they are hosting or may wish to join. Similar facilities may be found in newer games and online game services such as Valve's Steam, Blizzard's battle.net, and Gamespy Arcade.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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