• 1.12.2 on Java 21
• LWJGL3
• A working mod development template/kit
• Patches for loading incompatible mods
• Built-in Mixin w/ handy bootstrapping
• Develop using Scala 3 Kotlin 2
• Compatibility to 99% of Forge mods

• CleanroomGradle to replace ForgeGradle
• Classfile API
• Actually useful APIs (See here)
• Optimized

• Minecraft Coder Pack
• CleanroomLoader (Continuation Revamp of ForgeModLoader)
• Cleanroom Minecraft (Continuation Revamp of MinecraftForge)
• Customized Mixin
• Bytecode Patcher (Coming Soon) [Inspired by Bansoukou and Bytecode Patcher]
• Fugue, a mod patches many incompatibilities.
• Javassist
• Scalar, a Scala provider. We made Scala libraries become a standalone mod so it can be updated.

• For MultiMC-based launchers (PolyMC, PrismLauncher), download the MMC instance from release, import it in your launcher(alternatively unzip patches and json inside to your 1.12 instance).
• For regular launcher (official launcher, AT launcher, FTB, HMCL), download the installer jar from release. You could use the installer like the Forge one.
• Remember to install Fugue!
• And Scalar!

1. Clone this repository
2. Import the build.gradle into your IDE (most preferably IntelliJ IDEA)
3. Once the import has finished, run gradlew setup
4. Build with gradlew build

• Only modify projects/cleanroom/src/ directory if you want to change vanilla
• Run gradlew genPatches before commit, or the changes won't exist
• Modifications on src/ doesn't need generating patches
• Tips from Forge are still apply, keep the patches clean!
• The current patches is full of useless hunks after we switched to VineFlower, we encourage contributors to manual clean up their patches

There's an unofficial template exist. Note: You need to build before run.

A porting guide is available in Cleanroom wiki.

graph TD;
    A(Mixin integration)-->D(Bouncepad overhaul - we are here);
    B(LWJGL compat)-->D;
    C(Newer Java compat)-->D;
    D-->E(Config any time);
    D-->G(Minor improvement and fixes)
    E-->F(Greater improvement needs configs)
    X(Cleanroom Gradle)-->D
    D-->X
    D-->Y(Better Mixin Integration)
    Y-->D