Update

Chocohead (the creator of Fabric-ASM which this mod relies on), has created their own fork to Optifine which is objectively better. This repository has now been archived, if you intend to use Optifabric in the latest versions of the game, please refer to Chocohead's fork instead.

https://github.com/Chocohead/OptiFabric

Old habits die hard

Recently, modmuss50, the creator of the OptiFabric mod announced that their dropping support of Optifabric and recommends using Sodium instead. Sodium is an open source mod and is by far the better mod for optimizing the Minecraft client. However, old habits die hard, and so for dumb reasons, I can't help myself but be lured back to the comforts of optifine due to past familiarity (and connected glass textures).

Thus, since modmuss50 announced that they were deprecating Optifabric, it was particularily saddening as 1.16.x was released, since I would either have to leave optifine behind or get rid of my sweet suite of vanilla++ fabric mods when updating.

So, I am going to try to keep Optifabric updated in lieu of modmuss50. However, this mod's code is completely alien to me, and so it will probably be more buggy and breaking than before as I learn how it works.

Don't rely on it too much. I may just give up and embrace sodium like any other sane person would do...

Because I do not yet know what I am doing, I need YOUR help!

If you do know what you are doing, and know of a way to improve this mod, please make a pull request! That is always super helpful. If you find an issue, please make sure to report it here! Otherwise I won't know there is a problem.

Need Help?

If you need help installing any of these mods feel free to ask in the fabric discord server in the player-support channel. If you know of any mods that should be showcased here please get in contact with me.

OptiFabric

Note: This project is not related or supported by either Fabric or Optifine.

Note: This project does not contain Optifine, you must download it separately!

Installing

After installing fabric for 1.15.2, you will need to place the OptiFabric mod jar as well as the optifine installer in the mods folder.

Fabric Loader should be the latest version from the Fabric Website

If you need more help you can read a more detailed guide here

Links

OptiFabric Downloads

Optifine Download

Issues

If you happen to find an issue and you believe it is to do with OptiFabric and not Optifine or a mod please open an issue here

For Mod Devs

Add the following to your build.gradle

repositories {
    maven { url 'https://jitpack.io' }
}

dependencies {
    // replace OptiFabric:<version> with latest version on https://www.curseforge.com/minecraft/mc-mods/optifabric/files that fits your MC version
    modCompile 'com.github.modmuss50:OptiFabric:1.0.0-beta8'

    //Deps required for optifabric
    compile 'org.zeroturnaround:zt-zip:1.14'
} 

Put the standard Optifine jar in /run/mods

Class export can be enabled using the following VM Option, this will extract the overwritten classes to the .optifine folder, useful for debugging.

-Doptifabric.extract=true

Screenshots

Feel free to open a PR with more screenshots.

How it works

This would not have been possible without Chocohead's Fabric-ASM.

1. The mod looks for an optifine installer or mod jar in the current mods folder
2. If it finds an installer jar it runs the extract task in its own throwaway classloader.
3. The optifine mod jar is a set of classes that need to replace the ones that minecraft provides.
4. Optifine's replacement classes change the name of some lambada methods, so I take a good guess at the old name (using the original minecraft jar).
5. Remap optifine to intermediary (or yarn in development)
6. Move the patched classes out as they wont do much good on the classpath twice
7. Add optifine to the classpath
8. Register the patching tweaker for every class that needs replacing
9. Replace the target class with the class that was extracted, also do some more fixes to it, and make it public (due to access issues).
10. Hope it works