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{{Infoboxemulator|image logo = Cemu-Logo.png|first version = {{CemuVer}}|second active = Yes|third platform = Windows|fourth architecture = x86_64|target = [[Wii U emulators|Wii U]]|developer = Exzap, Petergov|fifth website = [http://cemu.info Cemu]|sixth license = Closed -sourcefreeware|support = [https://www.patreon.com/cemu Patreon]}}'''[[wikipedia:Cemu|Cemu]]''' is a closed-source, Windows-only [[Wii U emulators|Wii U emulator]]. Currently, the GamePad, Classic, and Pro controllers are emulatedfor Windows. It also requires a high-end PC is known to run games at full speed, although there are numerous bugs be the very first Wii U emulator ever that can crash boot games due to unimplemented features. A compatibility list can be found [http://compat.cemu.info/ here] or [http://docs.google.com/spreadsheets/d/19WV2YQvS2PkiHnQTlYP7cE2eHOPl06Rx4tCvfud_Hpw/edit?pref=2&pli=1#gid=0 here].

The latest version of Cemu is restricted Before updates are publicly released, they're accessible to backers over at first to project donors for a week.<ref>[https://www.patreon.com/cemu</ref> It's then followed by a free release with further improvementstheir Patreon].

* [http://cemu.info/index.html#download Latest free public release]

You will also need enough storage for the [[Wii U emulators|Wii U]] games. Running Cemu on [[Wine]] has been reported to work just as well as Windows.===Minimum===* OS: Windows 7 (64-bit) or above* GPUGraphics Card: Supports at least OpenGL 4.0 or above, Intel iGPUs are not recommended1* RAMMemory: 4 GB minimum, ===Recommended===* Windows 10 (64-bit)* Graphics Card: Supports OpenGL 4.6 (avoid integrated graphics)* Memory: 8 GB or more recommended

If you're on Linux, CEMU can be run using WINE with unexpectedly good results. Compared to performance on Windows, it runs in full speed with no noticeable input lag for instance. ==Playing GamesGame Formats and Files Needed==

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].

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. Once decrypted, simply copy and paste these over the original game's files11.0)+ versions you need to follow theses steps :

To install updates and *On Cemu interface, select File -> Install game update or DLC on Cemu (1.7.3+): * Run Select the game at least oncemeta.* Check Cemu'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 xml in the same name as meta folder of the above (substituting the "NUMBERS" bit with the actual numbers) in your "CEMUFOLDER/mlc01/usr/title" folder.update or DLC* Add any updates (which must be added first) you want Run the game to update the "CEMUFOLDER/mlc01/usr/title/NUMBERS/NUMBERS/" folder.* Create a folder named "aoc" UI and put show the update and/or DLC files into there. The "code", "content", and "meta" folders of the actual game itself also go in the "aoc" folder.version

[[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). HereThere's a recent regularly updated complete set of the official ones ([https://mega.nz/#F!Z4UWVIYS!HsOvjW4tUMHE40ECIG7sMQ March 2017]) but there's are 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 Cemu added native support for Wii Remote controllers as of 1.712.0. Cemu cannot connect to a real (or emulated) [[Nintendo 3DS emulators|3DS]]. ===Cemuhook===Using this is completely optional but highly recommended.3dWithout Cemuhook, some games won't have texts, have laggy cutscenes and display numerous other bugs. Download [http://sshnuke.net/cemuhook/ the Wii U GamePad latest version] compatible with your Cemu version, unpack it to the same directory as cemu.exe and right-click on dbghelp.dll, check Proprieties, Digital Signatures tab, select a signature and press Details. This should make it no longer crash at start-up. Make sure you also have the Wii U Classic Controller are emulatedlatest GPU driver installed, but as well as both x86 and x64 versions of the Wiimote still isn't emulated yet[https://aka.ms/vs/15/release/vc_redist.x64.exe Microsoft Visual C++ 2017 X64 Redistributable]. You can set up  After the first boot of Cemu with cemuhook installed, accept to download the missing shared fonts to 8 GamePads make the text in some games (Super Mario Maker among others) display correctly.Whenever you boot Cemu now, this cemuhook tool is enabled by default and offers various additions for better motion control emulation or some graphical hacks that greatly enhance Zelda BOTW in particular.Various way to take advantages of the menu if you wantcemuhook motion control emulation are listed [http://compat.cemu.info/wiki/Motion_Sensing#Full-motion_Solutions here].

Emulated Wii U GamePad features are as follow: * Touch Controls: Mouse left clickEnabling "GX2SetGPUFenceSkip (HACK)" enhances graphical emulation in BOTW in particular.* Tilting and Gyro Controls: Holding the mouse rightA pre-click and dragging. It's lacking Z-axis key binding at the moment.* Switch Screens between TV and GamePad: installed Graphical Pack that comes with recent versions of Cemuhook, "TABLWZX Crash Workaround" key, as well as the "Ctrl+TABGX2DrawDone()" option under Experimental, should help with some general crashes specific to keep focus. TV by default.* Microphone: Spoofed, a configurable key simulates blowing on the micBOTW.

A menu allows ===Shader Caches===When your game is loaded, check for loading NFC tags 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 first time you play through a game and at that time cause noticeable stuttering. You can download a complete cache from places like [http://www.reddit.com/r/Cemucaches/comments/7bv7el/complete_shader_cache_collection_1110c_v2/ 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 Amiibosversions older than 1.8.0 are incompatible with later versions of Cemu. (More details would be appreciated)

As At startup, Cemu will prepare a compiled version of nowthat cache under <code>.\Cemu\shaderCache\precompiled</code> and that one depends on your GPU driver, no online features so you might want to erase it if any problems or 3DS/Wii U connectivity features are possiblecrashes when compiling shaders at startup occur.

==Improving PerformanceTroubleshooting/Speeding up==

Normally, when playing a game in Cemu, a shader cache will be generated Shaders are normally cached as you playthe game. This will can cause a lot of stutter stutters 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 Cemu accepts other shader caches may cause slowdowns in some games, on some graphics cards (observed in Geforce 970s)that can be traded online. You can go to [https://www.reddit. If this is the case, delete both your transferable com/r/Cemucaches/ /r/Cemucaches] and precompiled caches as well as search for the ones you want.bin It's often very difficult to generate a complete cache for large games, 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 1.7not completely eliminate stuttering.0, who knows?

Changing your NVidia [[File:Shadercachestuff.png|thumb|Some settings in the Nvidia control panel settings to look like this might help with shadercache slowdown issues:.]]

[[File:ShadercachestuffSome 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 delete the ones you downloaded. In the case of the GeForce, also consider deleting the .bin and /toc file in your GLCache at <code>%APPDATA%\NVIDIA\GLCache\(hexstring)\(hexstring)</code>.png]]

===Native H264 H.264 Decoder===Lots of Wii U games use high resolution MP4 videos and render them using codecs intended are often encoded for the Wii Ugames with the expectation that the hardware plays it back on-the-fly, which can get slow but because the x86 architecture is not PowerPC, this is resource-intensive for Cemu since it has to emulate, and cause display bugs on CEMUrun the PowerPC video decoder. An unofficial utility called [https://sshnuke.net/cemuhook/ CEMUhookCemuhook] is a hook utility used in conjunction with CEMU from versions 1.7bypasses this by playing H.3 onward to render these cutscenes with a much faster 264 video codec native to directly from Windows. It's not officially supported thoughcodecs that are programmed for x86.

===Getting more performanceDisable Hyperthreading===Some users have reported that disabling hyperthreading improves performance in Cemu. On Windows may not be programmed well with hyperthreaded cores, turn off processor affinity for imaginary cores. This will be every other core in your processor affinityhyperthreading. To do thisdisable it, go to into the Task Manager, right-click cemu.exe process in task manager, right click, set affinity and then turn off every other coreset these affinities:

==Increasing Internal ResolutionGraphics Packs==The so-called To 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 to be confused with Texture Packs (since CEMU can't use them for that functionality yet),''' allow for upscaling the in-game graphics able to higher resolutions than change in the original, as well as other basic interface. Basic rendering options (including shadow resolution/and quality, post-processing effects like bloom, lightning lighting and godraysgod rays, custom anti-aliasing). It can affect what resolution the game is rendered as, as well as shaders, and works as a workaround for some emulation bugssuch can be applied here. You can even use them to ''reduce '' the internal resolution for an increase in the framerate. This is not to enjoy a slight FPS increasebe confused with '''Texture Packs''', which are replacement textures; Cemu doesn't support that, but it is planned.

Developers plan to add custom texture replacement in The "Graphic Packs" themselves are folders under the future (hence <code>graphicPacks</code> directory. They can be named anything, but they should contain the name) but that's yet to be seen as of 1"<code>rules.7.6txt</code>" file.A bare-bones example of a "Graphics Pack", called "Bayo_1080p", would look like this:

The Graphic Packs themselves come as folders under the graphicPacks directory. You can [Definition] titleIds = 0005000010172600,0005000010172700,000500001011b900,000500001014db00,0005000010157e00,0005000010157f00 name these folders whatever you want (for example = "Bayo_1080pBayonetta 1 + 2 - 1080p"), which contains just a single "rules.txt" file. A more bare-bones file would look like this: [TextureRedefine] width = 1280 height = 720 overwriteWidth = 1920 overwriteHeight = 1080

Whenever 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>::[Definition]::titleIds = 0005000010172600,0005000010172700,000500001011b900,000500001014db00,0005000010157e00,0005000010157f00::name = "Bayonetta 1 + 2 - 1080p"::::[TextureRedefine]::width = 1280::height = 720::overwriteWidth = 1920::overwriteHeight = 1080 logs.txt</code>file. You can safely delete it in the event that it gets too big for a text editor to parse.

In CEMU, under Options/Graphics Pack, you'll see The overwriteWidth and overwriteHeight properties used in this particular graphic pack as "Bayonetta 1+2 - example will upscale the game from 720p to 1080p". The name But if the game doesn't matterhave all of its textures in the specified resolution, what matters the most would they won't be that the titleIds (here matching all three US/EU/JP versions of both Bayonetta 1 upscaled and 2) match that of could look messy as a result. In this case, this problem is seen in some FMVs in the game in question. You can get This is the titleIds looking at purpose of the logs.txt file CEMU generates whenever it loads a new game (and which you can delete safely so that it doesn't get too big to read)TextureRedefine rule.

When you enable this graphical pack and then load the gameSince 1.13.0, 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 graphic packs system and interface was overhauled for better use and it could look messy as a resultmany bugs when using multiples graphic packs were fixed. For example1.15.1 and now on, in Bayonetta 2's case, this problem users can be seen in some FMVs. Thatdownload the community's why some graphical graphics packs add exclusions linked below directly from Cemu user interface and just check the graphics packs they want to enable. That update completly removed the TextureRedefine rule. But this here is a good starting point need to create graphical packs manage files for games that no one bothered to do, like Meme Run or Devil's Third among othersthe user.

You can (and probably should) get most See some of the community graphics packs made so far at [http://slashiee.github.io/cemu_graphic_packs/ from herethis page].

Here's some of the actual issues that directly relate to the end user experience: * Save states aren't getting implemented any time soon. A This has a lot of this has to do with the complexity of the Wii U memory layout and architecture, as well as the huge file size. As a result, the current developers are not interested in implementing them.* Frequent stuttering is often experienced when you first start a game, because CEMU is building your shader cache. One solution The emulator 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. That aside, there's other issues that stem from the still unfinished and unoptimised nature of the emulatorunoptimized, like as noted in the lack of native H264 efficient and stable H.264 video decoding libraries , causing green screens and glitchy videos (which . This is solved worked around with Cemuhook) among other things. ===Unofficial Builds===The restricted Patreon early access builds (behind a $5 donation a month for around two builds)entirely, released one week prior but its approach to the public release, have some checks in place. Builds that weren't verified online would have some features restricted impacting performance, as well as a ban video decoding is unlikely to be taken into the original backer if the build was shared more than how it reasonably should be for personal useemulator.

One particular developer, mudlord, who disagreed with ===Piracy===There are anti-piracy measures on the choices made by the CEMU devs, proceeded to release illegal cracked versions of these Patreon early -access builds on his personal blog, ironically also used to expose people breaching licenses for other emulatorsthat are put behind the $5 tier. A Cemu piracy subreddit and discord was even started to discuss Backers putting out these builds and how to can get them. These builds' illegal nature means youbanned if they're unlikely to find them anywhere else. This however stopped with 1.7.5 with him announcing he's not interested any longer in continuing thiscaught, and when the program fails verification, it locks down some features that impact performance.

UnderstandablyUntil 1.7.5 was released, the official CEMU subreddit advises against downloading these mudlord put out cracked versions of early builds, dismissing them as unsafe and malware, with bans for people not heeding this "advice"on his personal blog. However it didn't took too long for malware authors to take advantage of this A subreddit and distribute malicious copies of the early access build according Discord server was made to user reports in the CEMU discuss Cemu piracy subreddit. So use them at your own risk.