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Compatibility layers

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While not strictly emulation ''per se'' (hence why [[Wine]] stands for "Wine Is Not an Emulator"), '''compatibility layers''' allow software written for one operating system to run on a different OS, often by translating API and system calls made by an application to their equivalent calls in the host operating system. In theory, this should allow for near-native performance since no processor emulation takes place, but in practice some software such as games will tend to run a bit slower due to other bottlenecks that occur as a result of [[Emulation accuracy|replicating the correct behavior]], such as accounting for graphics APIs like Direct3D that aren't supported on non-Microsoft platforms. Additionally, compatibility layers may also use emulation in order to run software built for a different architecture, see [[Emulation Accuracy]] page for more information about terms like "[[Hypervisors|hypervisors]]", "[[Simulators|simulators]]", "[[Compatibility_layers|compatibility layers]]", "[[Wrappers|wrappers]]", "[[FPGA|FPGA-based hardware cloning]]" and "[[:Category:Emulators|software emulators]]".
==Compatibility layers==
! scope="col"|Runs the following software
|-
!colspan="7"|x86,x86-64
|-
|[[Wine]]
|align=left|{{Icon|Linux|macOS|FreeBSD|Haiku}}
|[https://wiki.winehq.org/Download {{WineVer}} <br />(Dev: {{WineDevVer}})]<br />[https://wiki.winehq.org/Haiku Haiku]
|{{✓}} ||{{✓}} ||{{✓}}
|Windows applications and games
|N/A
|{{✗}} ||{{✗}} ||{{✓}}
|PowerPC OS X apps on x86-64 based Macs. Support ended with OS X 10.7
|-
|CrossOver
|{{✗}} ||{{✓}} ||{{✓}}
|Windows applications and games
|-
|Game Porting Toolkit
|align=left|{{Icon|macOS}}
|[https://gist.github.com/Frityet/448a945690bd7c8cff5fef49daae858e Installation guide]
|{{✗}} ||{{✓}} ||{{✓}}
|Windows games
|-
|[https://mcpelauncher.readthedocs.io Minecraft Bedrock Launcher]
|libhoudini<br/>[https://groups.google.com/g/android-ndk-announce libndk]<br/>[https://www.intel.com/content/www/us/en/developer/topic-technology/bridge-technology.html Intel BT]
|align=left|{{Icon|Android}}
|[https://github.com/SGNight/Arm-NativeBridge#download-links-- 1], [https://github.com/Rprop/libhoudini#libhoudini 2], [https://githubarchive.comorg/details/ilhanandroidx86-athn7/android_proprietary_native_bridge houdini 3], [https://github.com/supremegamers/vendor_intel_proprietary_houdini 4], [https://github.com/m9rco/Genymotion_ARM_Translation 5], [https://archivegithub.orgcom/detailsilhan-athn7/androidx86-houdini android_proprietary_native_bridge 6], [https://github.com/supremegamers/vendor_google_proprietary_ndk_translation-prebuilt 7]
|{{✗}} ||{{TBD}} ||{{~}}
|ARM apps
|{{?}} ||{{✓}} ||{{✗}}
|Linux software
|-
|LATX
|align=left|{{Icon|Linux}}
|[http://pkg.loongnix.cn/loongnix/pool/main/l/lat/ 1.4.3 Beta 2]
|{{✗}} ||{{✓}} ||{{✗}}
|x86 Linux programs<abbr title="into LoongArch64 instruction set">*</abbr>
|-
|[https://www.linzhuotech.com/index.php/home/index/xdroid.html xDroid]
|[https://learn.microsoft.com/en-us/windows/wsl/install Install guide]
|{{?}} ||{{?}} ||{{✗}}
|<small>Allows developers to run a Linux environment without the need for a separate virtual machine or dual booting.</small>
|-
|[https://old.reddit.com/r/openKylin/comments/14u5kad/about_kmre/ KMRE]
|align=left|{{Icon|Linux}}
|[https://archive.ubuntukylin.com/ubuntukylin/pool/partner/kmre_2.4.6.8+22.04_amd64.deb 2.4.6.8]</br>[https://archive.kylinos.cn/kylin/KYLIN-ALL/pool/universe/k/kmre/kmre_2.4.8.7-0k0.9_amd64.deb 2.4.8.7-0k0.9]<ref group=A name=kmrex86>2.4.8.7 is untested-NeoKylin never announced nor shipped this with x86 releases</ref>
|{{?}} ||{{~}} ||{{✗}}
|<small>Allows openKylin /Ubuntu Kylin to run Android applications on different hardware platforms.</small>
|-
!colspan="7"|ARM
|N/A
|{{✗}} ||{{✓}} ||{{✓}}
|x86 -64 macOS applications on Apple Silicon Macs|-|CrossOver|align=left|{{Icon|macOS}}|[https://www.codeweavers.com/products 22.1]|{{✗}} ||{{✓}} ||{{✓}}|Windows applications and games|-|Game Porting Toolkit|align=left|{{Icon|macOS}}|[https://gist.github.com/Frityet/448a945690bd7c8cff5fef49daae858e Installation guide]|{{✗}} ||{{✓}} ||{{✓}}|Windows games
|-
|[https://box86.org/ Box86/Box64]
|{{✓}} ||{{✓}} ||{{~}}
|Android software
|-
|[https://github.com/xerpi/vita2hos Vita2hos]
|align=left|{{Icon|Switch}}
|[https://github.com/xerpi/vita2hos/releases/tag/alpha-0.3 Alpha 0.3]
|{{✓}} ||{{✓}} ||{{✗}}
|runs PlayStation Vita applications natively
|-
|[https://github.com/AndreRH/hangover Hangover]
|{{✗}} ||{{✓}} ||{{✗}}
|x86 Linux programs<abbr title="into Kunpeng platform instructions in real time">*</abbr>
|-
|[https://old.reddit.com/r/openKylin/comments/14u5kad/about_kmre/ KMRE]
|align=left|{{Icon|LinuxARM}}
|[https://archive.kylinos.cn/kylin/KYLIN-ALL/pool/universe/k/kmre/kmre_2.4.8.7-0k0.9_arm64.deb 2.4.8.7-0k0.9]</br>[https://archive.kylinos.cn/kylin/KYLIN-ALL/pool/universe/k/kmre/kmre_2.5.0.2-0k0.1tablet3_arm64.deb 2.5.0.2-0k0.1tablet3]<ref group=A name=kmrearm>2.5.0.2 is only for some industrial tablets or similar devices with Phytium processors. Regular desktop devices should continue with 2.4.8.7 .</ref>
|{{?}} ||{{~}} ||{{✗}}
|Allows openKylin/NeoKylin (with supported processors) to run Android applications.
|-
!colspan="9"|Console
|{{✓}} ||{{✓}} ||{{✓}}
|GameCube games
|-
!colspan="7"|Other
|-
|LATX
|align=left|{{Icon|Linux}}
|[http://pkg.loongnix.cn/loongnix/pool/main/l/lat/ 1.4.3 Beta 2]
|{{✗}} ||{{✓}} ||{{TBD}}
|x86 Linux programs<abbr title="into LoongArch64 instruction set">*</abbr>
|}
<references group=A />
===Comparisons===
*[[Wine]] is a free and open-source compatibility layer that aims to allow computer programs (application software and computer games) developed for Microsoft Windows to run on Unix-like operating systems, primarily Linux and macOS. Since late 2017 there is also an experimental build for Android. Wine is almost as old as the Linux project, starting in the summer of 1993. Today it's widely used, very popular and sponsored by companies such as CodeWeavers and Valve. The core Wine development aims at a correct implementation of the Windows API as a whole. In this regard it's similar to the [[MAME]] project in its focus on correctness over usability. There are a lot of versions/forks of Wine which focus of different goals, such as usability, compatibility, gaming, office applications, etc. A few are listed below, Wikipedia has [[wikipedia:Wine_(software)#Other_versions_of_Wine|a more complete list]].
* Windows Subsystem for Linux 1 is a compatibility layer and shouldn't be confused with WSL2. WSL2 introduced important changes such as a real Linux kernel, through a subset of '''Hyper-V features''', so it's not a compatibility layer like WSL1.
* KMRE is a compatibility layer and it's the official solution to run Android applications on computers with Chinese homegrown Phytium/KunPeng ARM processors and NeoKylin Linux operating system, though later also available on x86-64 on [https://www.ubuntukylin.com/index-en.html Ubuntu Kylin]. KMRE is not designed with third-party applications outside its app store and in fact, force installing third-party apps breaks older versions of KMRE. It's the go-to solution if you are restricted to working with these kinds of computers due to national security reasons.
* Vita2hos is an early compatibility layer for Nintendo Switch that runs PlayStation Vita applications natively. Only able to load simple test homebrews such as vita-8 as of December 2022. Appears to only be developed every once in a while.
==Wrappers==
[[Category:Compatibility layers]]
[[Category:Not really emulators]]
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{{NEL}}
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