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{{Infoboxemulator|image logo = Cemu-Logo.png|first version = {{CemuVerVersion|Cemu}}|second active = Yes|third platform = [[Emulators on Windows|Windows]]</br>[[Emulators on Linux|Linux]] (experimental)</br>[[Emulators on macOS|macOS]] (experimental)|architecture = x86_64|target = [[Wii U emulators|Wii U]]|fourth developer = Exzap, Petergov|fifth website = [http://cemu.info Cemu]|sixth license = Closed source}}MPL-2.0'''Cemu''' is a closed-source, Windows-only |compatibility = [[Wii U emulators|Wii U emulator]]https://compat. Currently, the GamePad, Classic, and Pro controllers are emulatedcemu. It also requires a high-end PC to run games at full speed, although there are numerous bugs that can crash games due to unimplemented features. The latest version of Cemu is restricted at first to project donors before being released to the public.<ref>info Compatibility list]|support = [https://www.patreon.com/cemu<Patreon]|source = [https://github.com/cemu-project/ref>Cemu GitHub]|bios = [[Emulator_files#Wii_U|Optional]]}}

'''[[wikipedia:Cemu|Cemu]]''' is a [[Wii U emulators|Wii U emulator]], first released in 2015 and eventually made open-source in 2022. It's known for being the first Wii U emulator to successfully boot a game. ==Download==Downloads{| cellpadding="4"|align=center|{{Icon|Win}}* |'''[http://cemu.info/index.html#download Latest free public release]'''<br/><small>Available one week after the Patreon builds release</small><br/>|-|align=center|{{Icon|Win|Lin|Mac}}|'''[https://github.com/cemu-project/Cemu/releases GitHub release]'''<br/><small>Experimental</small><br/>|}

* Windows 7 (x64) or above* macOS 12 Monterey or above* OpenGL 4.5 or Vulkan 1.1* RAM: 4 GB minimum, 8 GB or more recommended '''NVIDIA GPU:''' Runs as expected on most recent driver.<br>'''AMD GPU:''' Runs as expected on most recent driver. Avoid OpenGL due to bad performance<br>'''Intel GPU:''' Limited support. Vulkan is recommended ==How to get gamesGame formats and needed files=====Physical dumps===*Download an NUS downloader such You'll first need to fill in the "keys.txt" file in Cemu's directory. It has a sample line with a bogus key and a comment, which you may as well delete.  Your file must have many lines like this, one for the Wii U Common Key (D7B00402659BA2ABD2CB0DB27FA2B656), and one line for the Game Key of each game. Sharing these keys isn't exactly safe legally, but ROM sites at least share [http://application.wiiuusbhelperpastebin.com/UpdaterGWApZVLa the Game ones]. Note that for games using the Loadiine format, you won't need a Game Key at all, but those will need Cemu versions from 1.4.exe WiiU USB Helper]0 onward.*Paste this URL into WiiU USB helper when prompted Your ISO must be either uncompressed, compressed using WUD format, or in Loadiine format (only possible for the titlekey databaseversions 1.4.0 onward) to boot in Cemu. Here's a [http://docs.google.com/spreadsheets/d/19WV2YQvS2PkiHnQTlYP7cE2eHOPl06Rx4tCvfud_Hpw/edit?pref=2&pli=1#gid=0 compatibility list]. - Dump your discs using [https://gbatemp.net/threads/wudump-dump-raw-images-from-a-wiiu-game-disc.titlekeys451736/ Wudump].com/Select ===Digital copies===Cemu supports either physical games dumps in WUD, or compressed WUX format, as well as game dumps converted to the Loadiine format. Loadiine games come as multiple directories with game you want files and a .rpx file. Nintendo's CDN for Wii U and 3DS digital games is rather poorly secured, due to downloada huge oversight when designing the software protection for these consoles. As such, click with tickets proving you bought the game (but which you can get it through less legit ways), there are downloader utilities like NUSGrabber, FunKiiU, UWizard, or jnus among others, and decryption tools like UWizard and then download gamesCDecrypt, to obtain a functional copy. The process of how to exactly acquire those files is detailed elsewhere on this wiki.*This will download Load the .rpx file from [Your gamelocation]/code/[yourgame].rpx with Cemu. ===Updates and DLC===Prior to 1.7.3, only updates were supported though pasting update files for on the main game you chose 's folders (keeping in mind the same as main game is in Loadiine format) and overwriting any files. DLC wouldn't work at all through this method, though with some specific games there were workarounds and some could play DLC tracks in Mario Kart 8 through swapping of specific files. From 1.7.3 onwards, proper support for DLC and updates was included in Cemu. The Update installation method has been reworked since 1.11.0 simplifying the installation method a lot.tik's titleTo install updates and DLC on Cemu on (1.11.0). May I suggest that + versions you choose your own region where possibleneed to follow these steps :  *On Cemu interface, so select File → Install game update or DLC*Select the meta.xml in the meta folder of the update or DLC*Run the game to update the UI and show the update and/or DLC version ===Amiibo support===[[Amiibo]] are figurines unlocking various on-disc content in select 3DS and Wii U games. They use the download NFC technology. Nintendo Amiibo data is quicker distributed online as NFC tags (from your regional servers.bin files).There's a regularly updated complete set of the official ones, but there are also unofficial spoofed packs on various other sites. *Now we need Recent versions of Cemu include Amiibo support. Simply go to convert NFC / Scan NFC Tag from file, and load the game into loadiine format so that you can load it relevant .bin file. Keep in mind Amiibo support in Cemuis incomplete right now and not all figurines are compatible yet - though incompatibilities may be caused by bad Amiibo dumps as well. ==Setting up Cemu=====Controls===Cemu added native support for Wii Remote controllers as of 1.12.0. Cemu cannot connect to a real (or emulated) [[Nintendo 3DS emulators|3DS]].*Simply right click ===Shader caches===When your newly downloaded gameis loaded, then click Unpackcheck for its ID on the title bar in front of "SaveDir:" and note it down. The directory where transferable shader caches are stored is <code>.\Cemu\shaderCache\transferable</Convert to Loadiine (Pack/Unpack - Loadiine/CIA)code>.*Load They're generated the first time you play through a game and at that time cause noticeable stuttering.rpx file You can download a complete cache from places like [Your gamelocationhttps://chriztr.github.io/cemu_shader_and_pipeline_caches/ here]and rename them to match your game version's ID to spare yourself most of that unpleasant experience. Just keep in mind that shader caches from versions older than 1.8.0 are incompatible with later versions of Cemu. At startup, Cemu will prepare a compiled version of that cache under <code>.\Cemu\shaderCache\precompiled</code> and that one depends on your GPU driver, so you might want to erase it if any problems or crashes when compiling shaders at startup occur. ==Troubleshooting/[yourgame]speeding up=====Shader caches===Shaders are normally cached as you play the game. This can cause a lot of stutters and slow the game down. However, as of version 1.19.rpx with cemu0, Cemu added support for Asynchronous Shader Compiling on their Vulkan API which can make shader compiling near instantaneous on modern hardware, so try enabling that before hunting for shader caches.

=Updates and DLC=Use the same process as above Cemu accepts other shader caches that can be traded online. It's often very difficult to download updates. Once decryptedgenerate a complete cache for large games, simply copy and paste these over the original game's fileswill not completely eliminate stuttering, which is why using Asynchronous Shader Compiling is recommended instead.

DLC is not currently supported via this method, but there are specific games that can use DLC, with workarounds[[File:Shadercachestuff.png|thumb|Some settings in the Nvidia control panel might help.]]

To add DLC to Some games:*Run ' transferable caches may cause slowdowns on some graphics cards, like the game as normalGeForce GTX 970. *Check Cemu's log.txt file If this is the case, you will have to generate your own shaders and look for a line that says "Mounting local storage (AOC): delete the ones you downloaded.\mlc01\usr\title\NUMBERS\NUMBERS\aoc\"*Add (create) folders with In the same name as case of the above (substituting GeForce, also consider deleting the "NUMBERS" bit with the actual numbers) .bin and .toc file in your cemuGLCache at <code>%APPDATA%\mlc01NVIDIA\GLCache\etc. file*Add any updates (must be added firsthexstring) and DLC you want to this folder \(hexstring)</code, content and meta folders live inside the aoc folder)>.

==ShadercachesGraphic Packs==Normally, when playing a game in Cemu, a shader cache will be generated as you play. This will cause a lot of stutter To work around emulation bugs and slow other problems the game down the first time you play that level/area/game.Luckilyway [[Dolphin]] does, Cemu allows "Graphic Packs" are title-specific property sheets which define advanced settings you might not be able to transfer your shader cache, allowing you to download one from a friend (or just someone else on change in the internet)interface.Reddit seems to Basic rendering options including shadow resolution and quality, post-processing effects like bloom, lighting and god rays, custom antialiasing, and such can be a good place applied here. You can even use them to get these shadercaches. Simply [https://www.reddit.com/r/CEMUcaches/ go here] and search ''reduce'' the internal resolution for an increase in the game you want a cache forframerate.*Note This is not to be confused with '''Texture Packs''', which are replacement textures; Cemu doesn't support that , but it is very difficult to generate a 100% complete shadercache for large games and therefore this will not definitely completely eliminate stutteringplanned.

Transferable shader caches may cause slowdowns in some games, on some graphics cards (observed in Geforce 970s)The "Graphic Packs" themselves are folders under the <code>graphicPacks</code> directory. If this is the caseThey can be named anything, delete both your transferable and precompiled caches as well as but they should contain the "<code>rules.bin and txt</toc code>" file in your NVIDIA GLCache found in C:\Users\(You)\AppData\Roaming\NVIDIA\GLCache\(hexstring)\(hexstring). In this caseA bare-bones example of a "Graphics Pack", you will have to generate your own shaders.*This may get fixed after 1.7.0called "Bayo_1080p", who knows?would look like this:

[[File:ShadercachestuffWhenever the titleId matches the current one, Cemu will show the Graphics Pack under Options → Graphics Pack. If you don't know what the titleId of the game you want is, check the <code>logs.txt</code> file. You can safely delete it in the event that it gets too big for a text editor to parse.png]]

==Getting more performance==Some users The overwriteWidth and overwriteHeight properties used in this example will upscale the game from 720p to 1080p. But if the game doesn't have reported that disabling hyperthreading improves performance all of its textures in Cemu. On Windows with hyperthreaded coresthe specified resolution, turn off processor affinity for imaginary cores. This will they won't be every other core in your processor affinityupscaled and could look messy as a result. To do In thiscase, go to this problem is seen in some FMVs in the game. This is the purpose of the cemuTextureRedefine rule.exe process in task manager, right click, set affinity and then turn off every other core:

[[File:Processor_affinitySince 1.13.0, the graphic packs system and interface was overhauled for better use and many bugs when using multiples graphic packs were fixed.For 1.15.1 and now on, users can download the community's graphics packs linked below directly from Cemu user interface and just check the graphics packs they want to enable. That update completly removed the need to manage files for the user.png]]

* [httphttps://compatwiki.cemu.info/ Compatibility listwiki/Main_Page Wiki]* [https://discord.gg/5psYsup Official Discord]