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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 = MPL-2.0|compatibility = Closed source}}[https://compat.cemu.info Compatibility list]|support = [https://www.patreon.com/cemu Patreon]'''Cemu''' is a closed-|source, Windows= [https://github.com/cemu-only project/Cemu GitHub]|bios = [[Wii U emulatorsEmulator_files#Wii_U|Wii U emulatorOptional]]. Currently, the GamePad, Classic, and Pro controllers are emulated. 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 '''[[wikipedia:Cemu |Cemu]]''' is restricted at a [[Wii U emulators|Wii U emulator]], first to project donors for a weekreleased in 2015 and eventually made open-source in 2022.<ref>https://www.patreon.com/cemu</ref> It's then followed by known for being the first Wii U emulator to successfully boot a free release with further improvementsgame.

==DownloadsDownload==* {| 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/>|}

If you're on Linux, CEMU can be run using WINE with unexpectedly good results* Windows 7 (x64) or above* macOS 12 Monterey or above* OpenGL 4.5 or Vulkan 1. Compared to performance on Windows1* RAM: 4 GB minimum, it runs in full speed with no noticeable input lag for instance.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 ==Playing GamesGame formats and needed files=====Physical Dumpsdumps===

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://pastebin.com/GWApZVLa 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 1.4.0 onward.

Your ISO must be either uncompressed, compressed using WUD format, or in Loadiine format (only possible for versions 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.451736/ Wudump].

===Digital Copiescopies===CEMU 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 files and a .rpx file.

Nintendo's servers are poorly secured due to a huge oversight when designing Wii U/3DS software protection. As such, with tickets proving you bought the game (but which you can get through less legit ways), there are downloader utilities like NUSGrabber, FunKiiU, UWizard, or jnus among others, and decryption tools like UWizard and CDecrypt, to obtain a functional copy.* Download an NUS downloader such as [http://application.wiiuusbhelper.com/Updater.exe WiiU USB Helper].* Paste this URL into WiiU USB helper when prompted for the titlekey database. - https://wiiu.titlekeys.com/* Select the game you want to download, click get it and then download games.* This will download the files for the game you chose (the same as the .tik's title). May I suggest that you choose your own region where possible, so the download is quicker (from your regional servers).* Now we need to convert the game into Loadiine format so that you can load it in Cemu. Simply right click your newly downloaded game, then click "Prepare for Emulation".* Load the .rpx file from [Your gamelocation]/code/[yourgame].rpx with cemuCemu.

Prior to 1.7.3, only updates were supported though pasting update files on the main game's folders (keeping in mind the 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 CEMUCemu.

Use The Update installation method has been reworked since 1.11.0 simplifying the same process as above to download installation method a lot.To install updatesand DLC on Cemu on (1.11. Once decrypted, simply copy and paste 0)+ versions you need to follow these over the original game's files.steps :

To install updates on *On Cemu (1.7.3+): * Play the interface, select File → Install game at least once update or DLC* Open "log.txt" and find "TitleId of launched game" followed by a 16-digit number. Copy down that 16-digit number. * Go to "CEMUFOLDER/mlc01/usr/title" and create a folder with Select the first 8 digits of that 16-digit code* Inside of that folder, create a folder named with the last 8 digitsmeta. * Put xml in the files meta folder of the update into the folderor DLC* To apply DLC create a folder inside of Run the folder with your game to update the UI and create a folder named "aoc" show the update and put the /or DLC files into there and simply run the game.version

To add DLC to ===Amiibo support===[[Amiibo]] are figurines unlocking various on-disc content in select 3DS and Wii U games:*Run . They use the game NFC technology. Nintendo Amiibo data is distributed online as normal, at least onceNFC tags (.bin files). *Check CemuThere's log.txt file and look for a line that says "Mounting local storage (AOC): .\mlc01\usr\title\NUMBERS\NUMBERS\aoc\"*Add (create) folders with regularly updated complete set of the same name as the above (substituting the "NUMBERS" bit with the actual numbers) in your cemu\mlc01\etcofficial ones, but there are also unofficial spoofed packs on various other sites. file*Add any updates (must be added first) and DLC you want to this folder (code, content and meta folders live inside the aoc folder)

===Amiibo Support===Amiibo are hard-to-find figurines unlocking various on-disc content in select 3DS and Wii U games. They use the NFC technology. Nintendo Amiibo data is distributed online as NFC tags (.bin files). Here's a recent complete set of the official ones ([https://mega.nz/#F!Z4UWVIYS!HsOvjW4tUMHE40ECIG7sMQ March 2017]) but there's also unofficial spoofed packs on various other sites. Recent versions of CEMU Cemu include Amiibo support. Simply go to NFC / Scan NFC Tag from file, and load the relevant .bin file. Keep in mind Amiboo Amiibo support in CEMU Cemu is incomplete right now and not all figurines are compatible yet - though incompatibilities may be caused by bad Amiboo Amiibo dumps as well.

As of 1.7.3d, the Wii U GamePad and the Wii U Classic Controller are emulated, but the Wiimote still isn't emulated yet. You can set up to 8 GamePads in the menu if you want. Emulated Wii U GamePad features are as follow: * Touch Controls: Mouse left click.* Tilting and Gyro Controls: Holding the mouse right-click and dragging. It's lacking Z-axis key binding at the moment.* Switch Screens between TV and GamePad: "TAB" key, "Ctrl+TAB" to keep focus. TV by default.* Microphone: Spoofed, a configurable key simulates blowing on the mic. A menu allows Cemu added native support for loading NFC tags from Amiibos. (More details would be appreciated) As of now, no online features or 3DS/Wii U connectivity features are possible. ==Improving Performance=====Shadercaches===Normally, when playing a game in Cemu, a shader cache will be generated Remote controllers as you play. This will cause a lot of stutter and slow the game down the first time you play that level/area/game.Luckily, Cemu allows you to transfer your shader cache, allowing you to download one from a friend (or just someone else on the internet).Reddit seems to be a good place to get these shadercaches. Simply [https://www.reddit.com/r/CEMUcaches/ go here] and search for the game you want a cache for.*Note that it is very difficult to generate a 100% complete shadercache for large games and therefore this will not definitely completely eliminate stuttering. Transferable shader caches may cause slowdowns in some games, on some graphics cards (observed in Geforce 970s). If this is the case, delete both your transferable and precompiled caches as well as the .bin and /toc file in your NVIDIA GLCache found in C:\Users\(You)\AppData\Roaming\NVIDIA\GLCache\(hexstring)\(hexstring). In this case, you will have to generate your own shaders.*This may get fixed after 1.712.0, who knows? Changing your NVidia control panel settings to look like this might help with shadercache slowdown issues: [[File:Shadercachestuff.png]] ===Native H264 Decoder===Lots of Wii U games use high resolution MP4 videos and render them using codecs intended for the Wii U, which can get slow to emulate, and cause display bugs on CEMU. [https://sshnuke.net/cemuhook/ CEMUhook] is a hook utility used in conjunction with CEMU from versions 1.7.3 onward to render these cutscenes with a much faster video codec native to Windows. It's not officially supported though. ===Getting more performance===Some users have reported that disabling hyperthreading improves performance in Cemu. On Windows with hyperthreaded cores, turn off processor affinity for imaginary cores. This will be every other core in your processor affinity. To do this, go to the cemu.exe process in task manager, right click, set affinity and then turn off every other core: [[File:Processor_affinity.png]]

==Increasing Internal Resolution==The so-called "Graphic Packs", '''not Cemu cannot connect to be confused with Texture Packs (since CEMU can't use them for that functionality yet),''' allow for upscaling the in-game graphics to higher resolutions than in the original, as well as other basic rendering options a real (shadow resolution/quality, post-processing effects like bloom, lightning and godrays, custom anti-aliasingor emulated). It can affect what resolution the game is rendered as, as well as shaders, and works as a workaround for some emulation bugs. You can even reduce internal resolution to enjoy a slight FPS increase[[Nintendo 3DS emulators|3DS]].

Developers plan to add custom texture replacement ===Shader caches===When your game is loaded, check 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</code>. They're generated the future (hence the name) but first time you play through a game and at thattime cause noticeable stuttering. You can download a complete cache from places like [https://chriztr.github.io/cemu_shader_and_pipeline_caches/ here] and rename them to match your game version's yet ID to be seen as spare yourself most of that unpleasant experience. Just keep in mind that shader caches from versions older than 1.78.60 are incompatible with later versions of Cemu.

The Graphic Packs themselves come as folders At startup, Cemu will prepare a compiled version of that cache under the graphicPacks directory<code>. You can name these folders whatever \Cemu\shaderCache\precompiled</code> and that one depends on your GPU driver, so you might want (for example "Bayo_1080p"), which contains just a single "rules.txt" fileto erase it if any problems or crashes when compiling shaders at startup occur. A more bare-bones file would look like this:

<code>==Troubleshooting/speeding up==::[Definition]::titleIds = 0005000010172600,0005000010172700,000500001011b900,000500001014db00,0005000010157e00,0005000010157f00::name = "Bayonetta 1 + 2 - 1080p"::::[TextureRedefine]::width = 1280::height Shader caches== 720::overwriteWidth = 1920::overwriteHeight = 1080 </code>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 1.19.0, 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.

In CEMU, under Options/Graphics Pack, you'll see this particular graphic pack as "Bayonetta 1+2 - 1080p". The name doesn't matter, what matters the most would be Cemu accepts other shader caches that the titleIds (here matching all three US/EU/JP versions of both Bayonetta 1 and 2) match that of the game in question. You can get the titleIds looking at the logsbe traded online.txt file CEMU generates whenever it loads It's often very difficult to generate a new game (complete cache for large games, and will not completely eliminate stuttering, which you can delete safely so that it doesn't get too big to read)is why using Asynchronous Shader Compiling is recommended instead.

When you enable this graphical pack and then load the game, it will play following this rule which is upscaling a game that runs as 1280x720 so that it runs as 1920x1080. But if the game doesn't have all of its textures originally in that resolution you specified (1280x720), they won't be upscaled and it could look messy as a result[[File:Shadercachestuff. For example, png|thumb|Some settings in Bayonetta 2's case, this problem can be seen in some FMVs. That's why some graphical packs add exclusions to the TextureRedefine rule. But this here is a good starting point to create graphical packs for games that no one bothered to do, like Meme Run or Devil's Third among othersNvidia control panel might help.]]

You can (Some games' transferable caches may cause slowdowns on some graphics cards, like the GeForce GTX 970. If this is the case, you will have to generate your own shaders and probably should) get most delete the ones you downloaded. In the case of the graphics packs made so far [http://slashieeGeForce, also consider deleting the .githubbin and .io/cemu_graphic_packstoc file in your GLCache at <code>%APPDATA%\NVIDIA\GLCache\(hexstring)\(hexstring)</ from here]code>.

==IssuesGraphic Packs==HereTo work around emulation bugs and other problems the way [[Dolphin]] does, "Graphic Packs" are title-specific property sheets which define advanced settings you might not be able to change in the interface. Basic rendering options including shadow resolution and quality, post-processing effects like bloom, lighting and god rays, custom antialiasing, and such can be applied here. You can even use them to 's some of 'reduce'' the internal resolution for an increase in the actual issues framerate. This is not to be confused with '''Texture Packs''', which are replacement textures; Cemu doesn't support that directly relate to the end user experience:, but it is planned.

* Save states aren't getting implemented any time soonThe "Graphic Packs" themselves are folders under the <code>graphicPacks</code> directory. A lot of this has to do with the complexity of the Wii U memory layout and architectureThey can be named anything, as well as but they should contain the huge "<code>rules.txt</code>" file size. As A bare-bones example of a result"Graphics Pack", the current developers are not interested in implementing them.* Frequent stuttering is often experienced when you first start a gamecalled "Bayo_1080p", because CEMU is building your shader cache. One solution is to get shader caches available online for your game and use it. They also have been compatible across different versions of the emulators for quite a while.would look like this:

That aside [Definition] titleIds = 0005000010172600, there's other issues that stem from the unfinished and unoptimised nature of the emulator0005000010172700, like the lack of native H264 video decoding libraries causing green screens and glitchy videos (which is solved with Cemuhook) among other things.000500001011b900,000500001014db00,0005000010157e00,0005000010157f00 name = "Bayonetta 1 + 2 - 1080p" [TextureRedefine] width = 1280 height = 720 overwriteWidth = 1920 overwriteHeight = 1080

===Unofficial Builds===The restricted Patreon early access builds (behind a $5 donation a month for around two builds)Whenever the titleId matches the current one, released one week prior to Cemu will show the public release, have some checks in placeGraphics Pack under Options → Graphics Pack. Builds that werenIf you don't verified online would have some features restricted impacting performanceknow what the titleId of the game you want is, as well as a ban to check the original backer if <code>logs.txt</code> file. You can safely delete it in the build was shared more than how event that it reasonably should be gets too big for personal usea text editor to parse.

One particular developer, mudlord, who disagreed with The overwriteWidth and overwriteHeight properties used in this example will upscale the choices made by game from 720p to 1080p. But if the CEMU devs, proceeded to release illegal cracked versions game doesn't have all of these early builds on his personal blogits textures in the specified resolution, ironically also used to expose people breaching licenses for other emulators. A Cemu piracy subreddit and discord was even started to discuss these builds they won't be upscaled and how to get themcould look messy as a result. These builds' illegal nature means you're unlikely to find them anywhere elseIn this case, this problem is seen in some FMVs in the game. This however stopped with 1.7.5 with him announcing he's not interested any longer in continuing thisis the purpose of the TextureRedefine rule.

UnderstandablySince 1.13.0, the official CEMU subreddit advises against downloading these builds, dismissing them as unsafe graphic packs system and malware, with bans interface was overhauled for people not heeding this "advice"better use and many bugs when using multiples graphic packs were fixed. However it didnFor 1.15.1 and now on, users can download the community't took too long for malware authors s graphics packs linked below directly from Cemu user interface and just check the graphics packs they want to take advantage of this and distribute malicious copies of enable. That update completly removed the early access build according need to manage files for the user reports in the CEMU piracy subreddit. So use them at your own risk.

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