apricotfarmer11 / legacy-lwjgl3

A legacy-fabric mod that makes minecraft versions older than 1.13 run using LWJGL 3 instead of the legacy LWJGL 2

legacy-lwjgl3

A hacky over-engineered project that runs LWJGL3 on legacy-fabric minecraft versions (current only tested 1.8.9), Allowing you to use modern LWJGL features and libraries on older minecraft versions.

Table of Contents

• Usage
  • Dev Environments
  • Clients
• Performance Increases?

Credits

A whole lot of this code is just code from the original LWJGL 2 project modified to work with LWJGL 3, Thanks so much to the LWJGL devs for making their license so permissive.

and a big thanks to gudenau for the original F*rge mod https://github.com/gudenau/MC-LWJGL3 that did the same thing, thanks as a big portion of this code is from that project.

Usage

Dev Environments

First head over to https://jitpack.io/#Zarzelcow/legacy-lwjgl3 and select the latest version in commits

then add this to your build.gradle replacing %VERSION% with the version of your choosing

❯ build.gradle

import org.gradle.internal.os.OperatingSystem

project.ext.lwjglVersion = "3.3.1"

switch (OperatingSystem.current()) {
    case OperatingSystem.LINUX:
        project.ext.lwjglNatives = "natives-linux"
        break
    case OperatingSystem.WINDOWS:
        project.ext.lwjglNatives = "natives-windows"
        break
}

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

dependencies {
    modImplementation "com.github.Zarzelcow:legacy-lwjgl3:%VERSION%"
    implementation platform("org.lwjgl:lwjgl-bom:$lwjglVersion")

    runtimeOnly "org.lwjgl:lwjgl::$lwjglNatives"
    runtimeOnly "org.lwjgl:lwjgl-assimp::$lwjglNatives"
    runtimeOnly "org.lwjgl:lwjgl-glfw::$lwjglNatives"
    runtimeOnly "org.lwjgl:lwjgl-openal::$lwjglNatives"
    runtimeOnly "org.lwjgl:lwjgl-opengl::$lwjglNatives"
    runtimeOnly "org.lwjgl:lwjgl-stb::$lwjglNatives"
}

configurations.all {
    // Removes LWJGL2 dependencies
    exclude group: "org.lwjgl.lwjgl"
}

Clients

Shaded builds are not currently published, so you will have to build them yourself.

TLDR: ./gradlew remapShadowJar then add build/libs/*-all-remapped.jar to your mods, done

Longer version: in the directory containing the file build.gradle run the command ./gradlew remapShadowJar

this will create 2 new files in the folder build/libs, add the file ending with -all-remapped.jar to your list of mods and run the game

Performance Increases?

While increasing performance was not the main point you do very much do see a benefit from LWJGl 3's quite substantial performance increase, resulting in a bump of about 20 fps (for me) even while having to emulate a lot of lwjgl 2 code that got removed.

The settings used

JDK: temurin-17 (Adopt OpenJDK Hotspot 17)
JVM Options:
  -client
  -server
mods:
  - fabricloader 0.13.3,
  - java 17,
  - minecraft 1.8.9
World seed: 123
Options changed from default:
  - Map FPS: unlimited
  - Use VBOS: true
  - VSync: Disabled

Contributing

This project is a work in progress, if you have any suggestions or want to contribute feel free to open an issue or pull request
Seriously please I suck at code quality and need people to help me
Really i w ill accept it im begging you my code quality is so bad 😭