60 lines
2.8 KiB
Markdown
60 lines
2.8 KiB
Markdown
# opsu!
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**opsu!** is an unofficial open-source client for [osu!](https://osu.ppy.sh/),
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a rhythm game based on popular commercial games such as *Ouendan* and
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*Elite Beat Agents*. It is written in Java using [Slick2D](http://slick.ninjacave.com/)
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and [LWJGL](http://lwjgl.org/), wrappers around the OpenGL and OpenAL libraries.
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opsu! runs on Windows, OS X, and Linux platforms. A [libGDX port](https://github.com/fluddokt/opsu)
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additionally supports Android devices.
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## Getting Started
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Precompiled binaries for opsu! can be found on the
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[releases](https://github.com/itdelatrisu/opsu/releases) page, with the latest
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builds at the top. APK releases can be found [here](https://github.com/fluddokt/opsu/releases).
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### Java Setup
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The Java Runtime Environment (JRE) must be installed in order to run opsu!.
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The download page is located [here](https://www.java.com/en/download/).
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### Beatmaps
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opsu! requires beatmaps to run, which are available for download on the
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[osu! website](https://osu.ppy.sh/p/beatmaplist) and mirror sites such as
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[osu!Mirror](https://osu.yas-online.net/) or [Bloodcat](http://bloodcat.com/osu/).
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Beatmaps can also be downloaded directly through opsu! in the downloads menu.
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If osu! is already installed, this application will attempt to load songs
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directly from the osu! program folder. Otherwise, place songs in the generated
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`Songs` folder or set the `BeatmapDirectory` value in the generated
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configuration file to the path of the root song directory.
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Note that beatmaps are typically delivered as OSZ files. These can be extracted
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with any ZIP tool, and opsu! will automatically extract them into the songs
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folder if placed in the `SongPacks` directory.
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### First Run
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The `Music Offset` value will likely need to be adjusted when playing for the
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first time, or whenever hit objects are out of sync with the music. This and
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other game options can be accessed by clicking the "Other Options" button in
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the song menu.
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## Building
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opsu! is distributed as a Maven project.
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* To run the project, execute the Maven goal `compile exec:exec`.
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* To create a single executable JAR file, execute the Maven goal
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`install -Djar`. This will link the LWJGL native libraries using a
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[modified version](https://github.com/itdelatrisu/JarSplicePlus) of
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[JarSplice](http://ninjacave.com/jarsplice), which is included in the
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`tools` directory in both its original and modified forms. The resulting
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file will be located in `target/opsu-${version}-runnable.jar`.
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## Credits
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This software was created by Jeffrey Han
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([@itdelatrisu](https://github.com/itdelatrisu/)). All game concepts and
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designs are based on work by osu! developer Dean Herbert. Other credits can
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be found [here](CREDITS.md).
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## License
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**This software is licensed under GNU GPL version 3.**
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You can find the full text of the license [here](LICENSE).
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