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Compatibility layers

497 bytes added, 5 May
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==
{| class="wikitable" style="text-align:center;"
|{{✓}} ||{{✓}} ||{{~}}
|Minecraft: Bedrock Edition (Android version)
|-
|[https://waydro.id/index.html WayDroid]
|align=left|{{Icon|Linux}}
|[https://waydro.id/#install git]<br />[https://github.com/casualsnek/waydroid_script Extras script]
|{{✓}} ||{{✓}} ||{{~}}
|Android software
|-
|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]
|{{✗}} ||{{TBD}} ||{{~}}
|ARM apps
|-
|[[Anbox]]
|align=left|{{Icon|Linux}}
|[https://docs.anbox.io/userguide/install.html git]
|{{✓}} ||{{✗}} ||{{✗}}
|Android software
|-
|[https://www.gfdgdxi.top/uengine-runner/Help/ UEngine]
|align=left|{{Icon|Windows}}
|[https://github.com/otya128/winevdm/releases git]<br />[https://ci.appveyor.com/project/otya128/winevdm/ Dev]
|{{✓}} ||{{✓}} ||{{}}
|16-bit Windows apps and games
|-
|{{✓}} ||{{✓}} ||{{~}}
|Windows applications and games
|-
|[https://waydro.id/index.html WayDroid]
|align=left|{{Icon|LinuxARM}}
|[https://waydro.id/#install git]
|{{✓}} ||{{✓}} ||{{~}}
|Android software
|-
|[https://github.com/xerpi/vita2hos Vita2hos]
|{{✗}}
|Nintendo Switch games and homebrew
|-
|[[Anbox]]
|align=left|{{Icon|LinuxARM}}
|[https://docs.anbox.io/userguide/install.html git]
|{{✓}} ||{{✗}} ||{{✗}}
|Android software
|-
|[https://www.hikunpeng.com/document/detail/en/kunpengdevps/ug-exagear/usermanual/kunpengexagear_06_0002.html ExaGear-KunPeng]
* [[Darling]] is a translation layer that allows you to run unmodified macOS binaries on Linux. In its nature, it is similar to the well-known [[Wine]] project. At this point, does not yet run macOS application with a GUI.
* [https://mcpelauncher.readthedocs.io/ Minecraft Bedrock Launcher] is a compatibility layer made specifically to run the Android version of Minecraft: Bedrock Edition on Linux and macOS. It is not compatible with any other Android apps.
* [[Anbox]] is a project that aims to run Android applications on Ubuntu distributions. It is in alpha state and only known to work on Ubuntu 16.04. Anbox requires custom kernel modules to run because, unlike other emulators which emulate the whole Linux kernel, this one uses the host system's Linux kernel directly.
* 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==
Compatibility layers may also make use of '''wrappers''', which translate a specific graphics API to another. How the user sets up the wrapper varies between each project but most involve a drop-in replacement of the original libraries.
 
{{Main|Wrappers}}
 
[[Category:Compatibility layers]]
[[Category:Not really emulators]]
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