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# OpenRS2 Natives
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## Introduction
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OpenRS2 Natives are open-source replacements for the jaggl, jaggl\_dri and
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jagmisc native libraries.
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## Prerequisites
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Building OpenRS2 Natives requires the following pieces of software on all
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platforms:
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* [Java Development Kit][jdk] (version 7 or later)
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* [Apache Maven][maven] (version 3.3.9 or later)
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### Platform-specific dependencies
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Your platform's standard C compiler and [OpenGL][opengl] development headers
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must be installed.
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#### Windows
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Install the [Build Tools for Visual Studio][visualstudio] (2019 or later),
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which provide a command-line version of the Visual C++ compiler. The full GUI
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version of Visual Studio will also work, but it is not required.
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The Visual C++ tools must be present on your `%PATH%` when building OpenRS2
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Natives. The easiest way to achieve this is to open the command prompt with the
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'Developer Command Prompt for VS 2019' item from the start menu.
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The Java Development Kit and Apache Maven `bin` directories must be manually
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[added to your `%PATH%` variable][path].
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##### Cross-compiling
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To compile a 32-bit DLL on a 64-bit Windows system, open the 'x64\_x86 Cross
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Tools Command Prompt for VS 2019' instead.
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Maven's `nar.javaHome` variable must point to a 32-bit JDK and `nar.arch` must
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be set to `x86`:
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-Dnar.javaHome="C:\Program Files (x86)\path\to\jdk" -Dnar.arch=x86
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#### macOS
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Run `xcode-select --install` from the terminal to install the [Xcode][xcode]
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command-line tools.
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The easiest way to install the Java Development Kit and Apache Maven is with the
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[Homebrew][homebrew] package manager. After installing Homebrew, run
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`brew cask install java` and `brew install maven`.
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##### Cross-compiling
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The last version of Java to support the 32-bit version of Mac OS X is the
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[legacy Java 6 runtime][mac-legacy-java].
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Pass the following flags to Maven to compile against the 32-bit version of the
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legacy runtime on a 64-bit macOS system:
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-Dnar.javaHome=/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home -Dnar.arch=i386
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#### UNIX
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OpenRS2 Natives requires the [GNU Compiler Collection][gcc] and the [Mesa 3D
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Graphics Library][mesa] on UNIX-like systems (e.g. Linux).
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The easiest way to install all the dependencies is with your system's package
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manager. For example:
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* Debian-based systems: `apt install openjdk-12-jdk maven gcc libgl1-mesa-dev`
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* RPM-based systems: `yum install java-12-openjdk-devel maven gcc mesa-libGL-devel`
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* ArchLinux-based systems: `pacman -S jdk-openjdk maven gcc mesa`
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`-headless` packages are not sufficient as the `gl-natives` module is linked
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with `libjawt`.
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##### Compatibility
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The `aol.properties` file uses the normalized `os.name` property as part of the
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architecture/operating system/linker key. It currently only contains properties
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for Linux. While the default settings will probably work for other UNIX-like
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systems, the defaults are not ideal. For example, `g++` will be used as the
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linker instead of `gcc`, introducing a redundant dependency on `libstdc++`.
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##### Cross-compiling
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To compile a 32-bit shared object on a 64-bit UNIX system, Maven's
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`nar.javaHome` variable must point to a 32-bit JDK and `nar.arch` must be set
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to `i386`:
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-Dnar.javaHome=/path/to/jdk -Dnar.arch=i386
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## Building
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Run `mvn verify` to build the code and package it.
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## License
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All code and data is licensed under version 3.0 (and only version 3.0) of the
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[GNU Lesser General Public License][lgpl]. The full terms are available in the
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`COPYING.LESSER` file.
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## Copyright
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Copyright (c) 2019 OpenRS2 Authors
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OpenRS2 Natives is free software: you can redistribute it and/or modify it under
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the terms of version 3.0 of the GNU Lesser General Public License as published
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by the Free Software Foundation.
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OpenRS2 Natives is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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details.
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You should have received a copy of the GNU Lesser General Public License along
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with OpenRS2 Natives. If not, see <https://www.gnu.org/licenses/>.
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[gcc]: https://gcc.gnu.org/
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[homebrew]: https://brew.sh/
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[jdk]: https://jdk.java.net/
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[lgpl]: https://www.gnu.org/licenses/lgpl-3.0.html
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[mac-legacy-java]: https://support.apple.com/kb/DL1572
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[maven]: https://maven.apache.org/
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[mesa]: https://www.mesa3d.org/
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[opengl]: https://www.opengl.org/
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[path]: https://www.java.com/en/download/help/path.xml
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[visualstudio]: https://visualstudio.microsoft.com/downloads/
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[xcode]: https://developer.apple.com/xcode/
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