Multimegamander/uLaunch

Made with ❤️ by XorTroll

What is it?

uLaunch is a custom FOSS Nintendo Switch Home Menu (qlaunch) reimplementation, consisting of two custom library applets, one system appliction, and a system applet, working cohesively to give the user a simple, yet functional homebrew oriented Home Menu.

What are future project plans?

Look at the todo list to see all the planned future addons!

What about themes?

Check out this document for more info!

Features

This is the amount of features uLaunch contains, compared to the original HOME menu:

Homebrew support
- Launching as applets (no need of Album!)
- Launching as applications (no need of any titles to do so!)
- Custom basic homebrew menu
- Option to add custom NRO accessors to main menu (homebrew or custom items easily accessible, no more need of forwarders!)
Miscellaneous extras
- Web browsing (via web-applet) directly from the main menu!
- Foreground capturing from PC itself (Windows-only) via USB-C cable and QForegroundViewer!
UI
- Themes (different to official HOME menu themes/NXThemes)
  - Custom icons, menu graphics, background...
  - Custom background music and sound effects!
- Folders in order to keep your main menu organized!
- Option to show the suspended title in the background (like 3DS's HOME menu did!)
Users
- PC-like login on startup (select user and use it for everything, log off, register/change/remove password...)
- User password support! (up to 15 characters)

Disclaimer

uLaunch is FOSS and therefore is not liable for any damages caused by misuse or error in the software.

Homebrew-as-application 'flog' takeover

uLaunch launches homebrew present (added) to main menu as an application, taking advantage of the system's 'flog' built-in application title, which was stubbed but not removed, thus it's content can be overriden via LayeredFS and launched.

Since launching this title should be impossible, it might involve ban risk. uLaunch has this option disabled by default, so enable and use it use it at your own risk.

Project and subprojects

uLaunch is split, as mentioned above, into several sub-projects:

QDaemon (SystemAppletQDaemon)

This sub-project replaces qlaunch, aka title 0100000000001000.

This is the technically actual qlaunch reimplementation. In fact, it is used as a back-end for the project, which just does what the actual menu (QMenu) tells it to do. This had to be like that, since qlaunch is the only one who can access certain essential functionality like title launching, so QMenu needs to access it, so it communicates with this back-end to execute it and to obtain its outcome.

QMenu (LibraryAppletQMenu)

This sub-project replaces "cabinet" library applet, aka title 0100000000001002.

This is the HOME menu the user will see and interact with. It contains all the UI and sounc functionality, password, themes...

QHbTarget

This is the name for two related projects, whose aim is to target and launch homebrew NROs in a simple way. It can be considered as a simple and helpful wrapper around nx-hbloader's code:

System application (SystemApplicationQHbTarget)

This sub-project replaces "flog" system application, aka title 01008BB00013C000.

This is the process which runs instead of flog, which is used to launch homebrew as applications.

Library applet (LibraryAppletQHbTarget)

This sub-project replaces "dataErase" library applet, aka title 0100000000001004.

This is the same process but, like in normal HOME menu and Album, it runs homebrew as an applet. However, exiting homebrew here will exit to HOME menu instead of exiting to hbmenu.

QForegroundViewer

QDaemon daemon process, appart from usual (and special) HOME menu functions, it also sends the console's foreground display via USB as a raw RGBA8 1280x720 ~3MB buffer. QForegroundViewer is the PC tool (WinForms) which intercepts those sent buffers and renders them. It is a bit laggy, but can be very useful for taking quick screenshots!

Unlike the other projects, this one isn't essential and uLaunch would be perfectly usable ignoring this sent data.

For more technical information about uLaunch and qlaunch, check this.

Custom menu entries

uLaunch supports adding custom shortcuts. This means you can show entries with a custom icon, which launch a NRO with certain argv, what could be potentially used for stuff like emulator ROM shorcuts.

Entries consist on JSON files (one per entry) located at sd:/ulaunch/entries. They are used for two main purposes:

Adding homebrew accesses (as stated above) to the main menu
Specifying that a homebrew access or a system title go inside a folder

If you want to make your own access, create a JSON file in the entries folder (the name doesn't matter) like this:

{
  "type": 2,
  "nro_path": "<path-to-nro>",
  "nro_argv": "<custom-argv>",
  "icon": "<custom-icon-jpeg>",

  "name": "My custom entry",
  "author": "Second text for whatever I want",
  "version": "Third text"
}

Note that type needs to be always 2, and that type, nro_path must be present. The others are all optional.

Note that if name, author or version fields aren't set they will be loaded from the NRO, thus it would show the RetroArch core's name, etc., same with the icon.

Installing and removing

In order to check uLaunch's installation, you will need to pay attention to the titles directory of the CFW you're using.

How do I know whether it is installed?

Check if folders 0100000000001000, 0100000000001002, 0100000000001004 and 01008BB00013C000 exist. (and that they aren't empty, or at least contain a exefs.nsp file)

How do I remove it?

1 - Delete the following folders: 0100000000001002, 0100000000001004 and 01008BB00013C000.

2 - Delete only exefs.nsp file from 0100000000001000 directory (if there is a romfs folder present it could be a normal HOME menu theme)

Compiling

You will need devkitPro, devkitA64, libnx and all SDL2 libraries for switch development.

Clone (recursively!) this repo (uses libstratosphere and Plutonium submodules) and hit make in root. It should build everything and generate a titles folder ready for use inside SdOut.

Errors

If you get a crash using uLaunch, please check:

If the crash's title is 0100000000001000, 0100000000001002, 0100000000001004 or 01008BB00013C000 and you know for sure you have this project in your SD, then it is very likely related to this project.

Credits

Several scene developers for help with small issues or features.
SciresM for libstratosphere.
Switchbrew team for libnx and hbloader, the base of *QHbTarget projects (they're some useful wrappers of hbloader in the end)
C4Phoenix for the amazing design of this project's logo.
Icons8 website for a big part of the icons used by the default style.
Multimegamander touching up the README

Multimegamander / uLaunch