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A new era for Isaac modding begins now.

REPENTOGON is a mod for The Binding of Isaac: Repentance version v1.7.9b.J835 (untested and likely unsupported on other versions) that extends the Lua API with much-needed bug fixes, extra functionality, and performance enhancements.

Generally referred to as an "EXE mod" by the community, REPENTOGON works very differently than a traditional mod. Powered by LibZHL, the same framework used by Antibirth, REPENTOGON hooks directly into the game, allowing direct control over functionality which was previously impossible to replicate in mods, or would require significant performance-intensive hacks or rewrites to replicate.

LUA API Documentation

REPENTOGON makes additions and modifications to the Lua API and adds tons of new features. You can find the documentation here: https://repentogon.com/docs.html

Installing

1. Download a build from GitHub Actions.
2. Extract the contents of the zip file into your game's directory. You can find the directory by right clicking The Binding of Isaac: Rebirth in your Steam library page, clicking Properties, then Installed Files followed by Browse (located on the top right corner) on the window that appears.
   • If you are running the game on Linux via Proton, you will also need to access the Properties window, go to General, and enter WINEDLLOVERRIDES="dsound=n,b" %command% into the Launch Options entry. Without this launch option, REPENTOGON will be unable to load.
3. Launch the game. If REPENTOGON successfully loaded, you should now see zhl.log and repentogon.log files in your game directory, and the title bar should now say Binding of Isaac: Repentance (+ REPENTOGON vX.X.X).

Uninstalling

Technically, using the launch option -repentogonoff or removing dsound.dll is all that's needed to disable REPENTOGON, but for a "complete" uninstall:

1. Remove dsound.dll, freetype.dll, libzhl.dll, Lua5.4.dll, resources-repentogon, and zhlREPENTOGON.dll from the game folder.
2. Optionally, remove log files dsound.log, repentogon.log, and zhl.log.
3. Delete resources\rooms (containing 26.The Void_ex.stb) and resources\shaders (containing coloroffset_gold_mesafix).
4. In the resources\scripts folder, remove main_ex.lua and enums_ex.lua.
5. In User\Documents\My Games\Binding of Isaac Repentance (or the Save Data Path in savedatapath.txt), delete the Repentogon folder. Note that this will erase all custom achievements and completion marks!

Building

(Unless you're a developer, we recommend grabbing a build from GitHub Actions instead.)

Requirements

The nature of this project requires that we use the same compiler as the game. As a result, a Windows system is explicitly required, along with the following:

• CMake 3.13 or above
• Git
• Visual Studio 2019 or above

Steps

We assume Git Bash for the duration of this tutorial, as well as CMake GUI.

1. Recursively clone the repository: git clone --recursive https://github.com/TeamREPENTOGON/REPENTOGON
2. Launch CMake.
3. Under "Where is the source code", navigate to the root directory of the cloned repository (in most cases named REPENTOGON).
4. Under "Where to put the binaries", choose any folder. This is where the generated files will live.
5. At the bottom of the CMake GUI, hit "Configure".
   • If this is the first build, you will be prompted for more information.
   • Compiler must match your Visual Studio version.
   • Platform MUST be Win32.
   • Leave all other options as default, and press Finish.
6. Once configuration is done, hit "Generate". This will create a .sln in the folder you specified before.
7. Open the generated .sln in Visual Studio.
8. Build the project. Unless you're a developer, we recommend Release mode for performance.
9. When the build is finished, copy resources, resources-repentogon, dsound.dll, freetype.dll, libzhl.dll, Lua5.4.dll, and zhlREPENTOGON.dll and to the game's folder.

• Optionally, the ISAAC_DIRECTORY setting can be set to the game's root directory to automatically copy these files after a build.

License

REPENTOGON is licensed under the GNU General Public License version 2.

LibZHL is licensed under the MIT license. All contents in the libzhl and libzhlgen folders are therefore licensed under MIT, with the exceptions of the following files and folders, which are components of REPENTOGON:

• libzhl/functions and its contents
• libzhl/IsaacRepentance_static.cpp

Folders in the libs folder are external dependencies and have their own licensing information. Check those folder (or, in the case of submodules, their respective dependencies) for further information.

Sponsors

Signpath is providing us with free code signing for our releases, thanks!

Privacy Notice

REPENTOGON does not collect or transmit any user data without explicit consent. We have an opt-in update mechanism that will transmit the user's IP address to GitHub on launch to determine if there is a new version available, but otherwise, absolutely zero data is processed or stored.