LAS Recomp

LAS Recomp

[!IMPORTANT] This project was made almost exclusively with AI. Nearly all of the code, tooling, reverse engineering and documentation in this repository was written by and will be maintained by an AI (Anthropic's Claude, through Claude Code), directed, tested and reviewed by a human. As a huge fan of this game, I made this for myself. Sharing it is a courtesy. If you don't agree with the use of AI or don't trust code written by AI, that is your right, but I'm not interested in the controversy in relation to this project. You may simply ignore this project and its code. As with anything on the internet, you run the code at your own discretion.

LAS Recomp is a static recompilation of The Legend of Zelda: Link's Awakening (Nintendo Switch, 2019) into a native Windows and macOS application.

[!NOTE] Currently supported platforms:

• macOS - Apple Silicon only, Metal graphics backend + MetalFX
• Windows - x86-64 only, Vulkan graphics backend

[!NOTE] No game files are included. LAS Recomp needs your own legally obtained copy of the game: a dump of Link's Awakening v1.0.0 (XCI or NSP) from your console and your console's prod.keys. Instructions on how to obtain these files from your Switch and game copy will NOT be provided. On first launch the start screen extracts what it needs. No game files, assets, keys or fonts are included. The screenshot shows the start screen after extraction; no Nintendo artwork is included until provided by the user.

Project Discord

https://discord.gg/DhrgdYqdcY

Status

This is a 0.1 alpha release. That means bugs are likely, crashes could occur, randomizer seeds could possibly be unsolvable (dungeon room shuffle modes are especially experimental at this point) and some graphics issues remain (especially in wide and ultrawide aspect ratios). This is a work in progress, hence the alpha designation. Please use the Discord for discussing possible randomizer logic issues and submitting bug reports.

Known issues

• The Mysterious Woods look wrong when viewed from outside the woods.
• Some lighting effects show horizontal lines in dungeons, caves and houses.
• Controller doesn’t work on the start screen.
• Shadow bugs in big dungeon rooms at ultrawide
• Black boxes sometimes appear in dungeon rooms.

Features

Runs natively

• This is not emulation. Runs natively on Windows and macOS using static recompilation of the Switch code.
• Unlocked aspect ratio: wider (or taller) windows show more of the island, up to ultrawide; houses and dungeons keep their framing. The original 16:9 framing is one option away.
• Start screen: play vanilla or any randomizer seed, set up game files from your own dump, import fonts.
  • Switch games use fonts built into the Switch operating system for some text. Sensible replacements are used by default, but you may optionally set up the Switch fonts for an authentic look. Switch fonts are Nintendo IP; you must provide them from your own hardware.
• In-game overlay menu (F1, or Minus + Plus on a controller).
• Switch between vanilla and any randomizer seed without restarting the app.
• Keyboard and controller support, with every button and key remappable (Controls tab / start screen Settings > Controls; menus keep a fixed layout, so a remap can never lock you out).
• Button prompts for your controller: Xbox or PlayStation icons in the game's own UI and text when SDL reports that controller (or pick Nintendo / Xbox / PlayStation yourself); the icons follow your controller remapping.
• Optional 360-degree movement, blur removal and a hidden Hero Mode icon.
• Apple MetalFX upscaler on macOS (the default there).
• Internal resolution adjustments: raise or lower the resolution in steps, match the display, or use dynamic resolution. Combined with the MetalFX upscaler, even a MacBook Air should handle this easily with the right settings. Bilinear upscaling is the only option on Windows currently.

Randomizer

• In-game seed generator.
• Seed IDs for sharing or reproducing exact seeds.
• Per-seed save games.
• Full item shuffle.
• Trade Quest shuffle.
• Disable Acorn / Piece of Power drops.
• Bombs / Magic Powder shuffle.
• Hookshot anything - the hookshot latches onto any wall or object, not just hookshot targets (in logic where enabled).
• Environment Randomizer - randomizes in-game environmental effects.
• Enemy Randomizer - shuffles overworld enemies, optionally including mini-bosses. Not all mini-bosses are included yet; more will be added as they're made to work outside their dungeons.
• Music Randomizer.
• Escape Bottle - every seed gives you this gold bottle from the start (it replaces one bottle in the pool). Use it to warp to the dungeon entrance when in a dungeon, or to Marin and Tarin's house anywhere else. Never required by the logic.
• Pickup text in the game's own message box: dungeon items name the dungeon they belong to ("You got a small key for Tail Cave!").
• Potsanity - every pot is a check. Pots are golden until checked, so you can see at a glance which pots you've checked.
• Bushsanity - every cuttable bush (not the grass) is a check. Like pots, bushes are golden until checked for the first time. Bushes over a hole or staircase stay normal, so items can't fall in.
• Digsanity - a truly insane setting that makes every diggable tile on the overworld a check (about 5,000). Holes stay dug permanently so you know where you've dug. Made for shovel enthusiasts.
• Keysanity - keys can be found anywhere for any dungeon.
• Shopsanity - the shop's 6 items are checks, at vanilla or random prices, or just steal them. A bought or stolen slot shows a sold-out sign.
• Trendsanity - full Trendy Game randomization: every prize, including the figures, is a check.
• Pets - companions as items in the pool:
  • Rooster - in logic for Feather checks (including in dungeons if companions are allowed there).
  • Marin - you need to find Marin to get into the desert; choosing open desert removes Marin from the item pool.
  • Ghost - find the Ghost to unlock his grave check.
  • Switch companions from the pause menu, or send yours away.
• Boss souls - a boss doesn't appear, can't be beaten and its reward stays locked until you find its soul.
• Mini-boss souls - the same for dungeon mini-bosses (a separate option).
• Entrance Randomizer - shuffles dungeon entrances, houses and caves, and connector caves. Includes a decoupled option.
• Dungeon Room Shuffler - shuffles all dungeon rooms, creating unique custom dungeons every seed. Three modes:
  • Coherent: dungeon rooms are shuffled but connecting rooms are lined up. To keep this workable in logic, dungeons sometimes use duplicate rooms (as few as possible).
  • Chaos: dungeon rooms are shuffled but don't need to make sense. Walking north may lead you to a door from another direction.
  • Madness: dungeon rooms are shuffled in a way that doesn't need to make sense AND the doors are decoupled, creating nightmares to navigate.
  • Labyrinth (planned): an option for all dungeon room shuffles where doors in dungeons can lead into other dungeons, essentially making one giant dungeon with numerous wings.
  • Optionally the map shows what's connected to what as you explore, or in full once you find the dungeon's map.
• The inventory screen tracks keys, dungeon items, trade items and souls for each dungeon, so you can see at a glance what you have keys for and which trade items you still hold.
• Built-in check tracker on the overworld map (optional).

Building from source

Both platforms need your own v1.0.0 dump and keys: build first, then use the start screen's game-file setup to extract them into extracted/ (exefs/, romfs/ and romfs.bin), or extract them yourself with hactool (make hactool builds it). make gen then recompiles the game code from your own extracted/exefs into generated/; without it the build runs the start screen only.

macOS

Requirements: Apple Silicon, Xcode command line tools (clang), Homebrew sdl3 and ffmpeg, Python 3.12.

1. Build: make -j10 -> build/lasrecomp. Set up your game files (above), then make gen and make -j10 again.
2. Randomizer: create the Python environment for LAS-Randomizer, from third_party/LAS-Randomizer: python3.12 -m venv venv && venv/bin/pip install -r requirements.txt.
3. Run: ./build/lasrecomp extracted (start screen) or ./build/lasrecomp extracted --play (straight into the game).
4. Package: make deps (once: SDL3, FFmpeg, hactool, keystone and Python from pinned sources, built for macOS 15), make rando-helper (the seed generator as a standalone helper, so players need no Python), then make app -> build/LAS Recomp.app (macOS 15+, Apple Silicon) and make dmg -> build/dist/LAS Recomp-<version>-macOS.dmg.

Windows

Requirements: Windows 10+ x86-64, a CPU with AVX2 and a GPU with Vulkan 1.3. More detail in docs/BUILD-windows.md.

1. One-time setup, in PowerShell from the repo root: powershell -ExecutionPolicy Bypass -File tools\setup_windows.ps1. It installs MSYS2 (UCRT64: clang, make, SDL3, FFmpeg, Vulkan, shaderc), Python 3.12 for the tools and the randomizer (third_party\LAS-Randomizer\venv), builds hactool and switches the clone to LF line endings.
2. Build, from an MSYS2 UCRT64 shell (or Git Bash with export PATH="/c/msys64/ucrt64/bin:/c/msys64/usr/bin:$PATH"): make -j -> build/lasrecomp.exe. Set up your game files (above), then make gen and make -j again.
3. Run: ./build/lasrecomp.exe extracted, from a shell with C:\msys64\ucrt64\bin on PATH (for the DLLs).
4. Package: make deps-windows (once: LGPL FFmpeg), make rando-helper RANDO_PY="<path to python.org Python 3.12>" (MSYS2's Python has no oead wheel), then make dist -> build/dist/LAS Recomp-<version>-windows.zip.

Where files live (game files, saves, seeds, settings, caches, imported fonts):

• macOS app: ~/Library/Application Support/com.peiikai.lasrecomp/ (the app itself is never written to).
• Windows: next to lasrecomp.exe, so put the LAS Recomp folder somewhere writable (not Program Files).
• Dev / portable mode: if the folder you start from has extracted/ (a source checkout), that folder is used, as above.
• LARECOMP_DATA_ROOT=<dir> overrides all of these.

Credits

LAS-Randomizer - the randomizer at the heart of this project's randomizer features, vendored (with local changes) in third_party/LAS-Randomizer under the MIT license. Huge thanks to its authors and community:

• Owen_Splat - LAS-Randomizer (https://github.com/Owen-Splat/LAS-Randomizer)
• Glan - created the original early builds of the randomizer (https://github.com/la-switch/LAS-Randomizer)
• ProfessorLaw - additional programming
• and everyone who has reported bugs, given feedback or contributed to LAS-Randomizer

Community mods - some options re-implement ideas from these GameBanana mods (re-implemented in the recomp; none of their files are used):

• 360 Controls (And More!) by Owen_Splat - 360-degree movement, blur removal (blur removal patch by theboy181) (https://gamebanana.com/mods/659802)
• XBOX UI by fellow_demo - Xbox button prompts (https://gamebanana.com/mods/540069)
• PS4 UI Buttons by messiahgov - PlayStation button prompts (https://gamebanana.com/mods/324458)
• No Hero Mode Indicator by Boo/Calla - hide the Hero Mode icon (https://gamebanana.com/mods/441172)

Libraries and tools

• SDL 3 - windowing, input, audio (zlib license)
• FFmpeg - movie playback (LGPL)
• Dear ImGui - overlay menu and start screen (MIT)
• Vulkan Memory Allocator - Windows renderer (MIT)
• hactool by SciresM - game file extraction (ISC)
• oead and evfl - Nintendo file formats, used by LAS-Randomizer
• PyInstaller - packs the seed generator into a standalone helper (GPL 2.0+ with the bootloader exception, which allows distributing the packed program). The helper bundles CPython (PSF License), oead / evfl (GPL 2.0+), Keystone (GPL 2.0; Python bindings BSD), quicktex (LGPL 3), Pillow (MIT-CMU), PyYAML (MIT) and appdirs (MIT)
• Capstone - disassembly in the development tools
• envytools - NVIDIA GPU documentation used for the shader translator
• The Switch homebrew community's documentation (Switchbrew)

Legal

LAS Recomp is a fan project. It is not affiliated with, endorsed by or sponsored by Nintendo. The Legend of Zelda and Link's Awakening are trademarks of Nintendo. No game files, assets, keys or fonts are included - not in this repository and not in release builds. You must provide your own legally obtained copy of the game (and your own keys) to play.

License

LAS Recomp's own code (the recompiler tools, the runtime, the randomizer additions) is open source under the MIT License. Third-party components keep their own licenses: LAS-Randomizer (MIT), Dear ImGui (MIT), Vulkan Memory Allocator (MIT), SDL 3 (zlib), FFmpeg (LGPL 2.1+, linked dynamically), hactool (ISC), and the seed generator helper's bundled libraries listed under Credits (oead / evfl / Keystone are GPL 2.0+: the helper is a separate program the game runs, and its sources are this repository plus those projects' published sources). The license covers LAS Recomp's code only - it grants nothing for Nintendo's game, which you must supply yourself.

Source code of bundled third-party components

Release builds include these components; their source code for the exact versions shipped is available here:

Component	Version	License	Source
Keystone (seed generator)	0.9.2	GPL 2.0	https://github.com/keystone-engine/keystone/releases/tag/0.9.2
oead (seed generator)	1.3.0	GPL 2.0+	https://github.com/zeldamods/oead/releases/tag/v1.3.0
evfl (seed generator)	1.2.0	GPL 2.0+	https://github.com/zeldamods/evfl/releases/tag/v1.2.0
quicktex (seed generator)	0.2.1	LGPL 3.0	https://github.com/drewcassidy/quicktex/releases/tag/v0.2.1
PyInstaller (packs the seed generator)	6.22.3	GPL 2.0+ with bootloader exception	https://github.com/pyinstaller/pyinstaller/releases/tag/v6.22.3
CPython (seed generator)	3.12.14 (macOS), 3.12.10 (Windows)	PSF	https://github.com/python/cpython/releases/tag/v3.12.14, https://github.com/python/cpython/releases/tag/v3.12.10
FFmpeg (LGPL configuration, macOS and Windows builds)	9.0.2	LGPL 2.1+	https://ffmpeg.org/releases/
SDL 3	3.4.18	zlib	https://github.com/libsdl-org/SDL/releases/tag/release-3.4.18
hactool	1.4.0 (macOS), 1.4.0-13-g1d64a83 (Windows)	ISC	https://github.com/SciresM/hactool/releases/tag/1.4.0, https://github.com/SciresM/hactool/tree/1d64a83
shaderc (Windows: GLSL to SPIR-V)	2026.4	Apache 2.0	https://github.com/google/shaderc
libiconv (Windows: used by SDL 3)	1.19	LGPL 2.1+	https://ftp.gnu.org/pub/gnu/libiconv/libiconv-1.19.tar.gz
GCC runtime: libgcc, libstdc++ (Windows)	16.2.0	GPL 3.0 with the GCC Runtime Library Exception	https://gcc.gnu.org/
winpthreads (Windows, mingw-w64)	14.0.0	MIT / BSD	https://www.mingw-w64.org/

The exact build scripts that fetch and build these (with checksums) are in this repository: tools/build_deps_macos.sh, tools/build_deps_windows.sh and tools/rando/rando_gen.spec. The Windows build takes SDL 3, shaderc, libiconv and the compiler runtime from MSYS2's UCRT64 packages (https://packages.msys2.org, which links each package's source).