Modding Migration Guide: gregCore v1.0.0.35

The Unity 6 IL2CPP Problem

In Unity 6 (Data Center version), the IMGUI system (GUI.Window, GUILayout) is heavily stripped during the IL2CPP build process. Using managed delegates (like Action<int>) for UI windows often fails with: [Il2CppInterop] Exception in IL2CPP-to-Managed trampoline: System.NotSupportedException: Method unstripping failed.

This causes infinite log spam and crashes the rendering bridge.

The Solution: GregUI (UGUI Framework)

Starting with version 1.0.0.35, gregCore provides a safe, native UGUI backend that bypasses the broken IMGUI trampolines.

1. Legacy Fixes (Automatic)

greg.Sdk.gregEventDispatcher: Restored for compatibility with older mods.
gregNativeEventHooks: Stabilized signatures for better IL2CPP linking.

2. Migrating to GregUI (Manual Action Required)

Mods using OnGUI() or GUI.Window() should migrate to the GregUI Builder API.

Old Code (Prone to Crashes):

void OnGUI() {
    GUI.Window(id, rect, DrawWindow, "Title");
}
void DrawWindow(int id) {
    if (GUILayout.Button("Click Me")) { /* logic */ }
}

New Safe Code (v1.0.0.35+):

using gregCore.PublicApi;

public void BuildUI() {
    greg.UI.CreateBuilder("Economy Hud")
        .SetSize(400, 300)
        .AddLabel("Current Funds: $1500")
        .AddButton("Add Money", () => {
            // Your logic here - safely wrapped for IL2CPP
        })
        .AddButton("Close", () => {
            gregCore.UI.GregUIManager.SetPanelActive("Economy Hud", false);
        })
        .Build();
}

// Toggle visibility via hotkey
if (Input.GetKeyDown(KeyCode.F9)) {
    gregCore.UI.GregUIManager.TogglePanel("Economy Hud");
}

Important: Clear Cache

After updating gregCore.dll, you MUST delete the following folder to force metadata regeneration: [GamePath]/MelonLoader/Il2CppAssemblies/

Failure to do so will cause TypeLoadExceptions even if the code is correct.

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