NanoVG for 1.21x

Tutorial inspired by this. (This wont work on its own)

Getting and patching LWJGL3

WaterwaveMC has a patched LWJGL, so we're going to use that.

Add this to your gradle.properties:

# LWJGL Properties
lwjgl_version = 3.3.2
lwjgl_patch_version = 5

Add this to your build.gradle:

def lwjglNatives = "natives-windows" // Change this depending on your platform: windows, linux, macos

repositories {
        maven { url "https://jitpack.io" }
        mavenCentral()
}

dependencies {
    implementation platform("org.lwjgl:lwjgl-bom:3.3.2")

    runtimeOnly "org.lwjgl:lwjgl::$lwjglNatives"
    runtimeOnly "org.lwjgl:lwjgl-nanovg::$lwjglNatives"
    runtimeOnly "org.lwjgl:lwjgl-stb::$lwjglNatives"

    implementation "io.waterwave.Legacy-LWJGL3:lwjgl:${project.lwjgl_version}-${project.lwjgl_patch_version}"
    implementation "io.waterwave.Legacy-LWJGL3:lwjgl-stb:${project.lwjgl_version}-${project.lwjgl_patch_version}"
    implementation "io.waterwave.Legacy-LWJGL3:lwjgl-nanovg:${project.lwjgl_version}-${project.lwjgl_patch_version}"
}

Reload your project and see if there are any errors.

Patching Nano VG

We used a pre-patched LWJGL, However NanoVG isn't patched so we will through a Mixin.

NanoVG looks for a GL class, but it's not present in LWJGL 2, so we have to use our own function provider.

Function Provider Mixin

Congrats! You have successfully aqired LWJGL and NanoVG.

UI Example

import static org.lwjgl.nanovg.NanoVG.*;
import static org.lwjgl.nanovg.NanoVGGL2.*;
import static org.lwjgl.opengl.GL11.*;

private long ctx = -1L;

/**
* ONLY call this ONCE!!!
*/

// The author of this class is refactoring, NOT ME!

public void init() {
    ctx = nvgCreate(NVG_ANTIALIAS | NVG_STENCIL_STROKES); // NanoVGGL2 must be used.
        
    if(ctx == -1) {
         throw new IllegalStateException("Context not initialized");
    }
}

public void render() {
    glPushAttrib(GL_ALL_ATTRIB_BITS);
    GlStateManager.disableAlphaTest();
    nvgBeginFrame(ctx, Display.getWidth(), Display.getHeight(), 1F);
    try(NVGColor col = NVGColor.calloc()) {
        nvgRGBf(255, 255, 255, col); // White
        nvgBeginPath(ctx);
        nvgRoundedRect(ctx, 10f, 10f, 100f, 100f, 10f);
        nvgFillColor(ctx, col);
        nvgFill(ctx);
    }
    nvgEndFrame(ctx);
    GlStateManager.enableAlphaTest();
    glPopAttrib();
}