RmlUi VS hikogui

How about https://github.com/mikke89/RmlUi ?

Check out these: https://github.com/ocornut/imgui https://github.com/mikke89/RmlUi

See the release notes here: https://github.com/mikke89/RmlUi/releases/tag/5.0

You're right, it's a fork of libRocket. The original library hasn't seen any development in years, so in a sense RmlUi is a continuation of it too. There's been a lot of changes since then, you can see all of it in the full changelog here.

I haven't actually used either one, but there's HikoGUI (previously known as TTauri) under the Boost license and RmlUI under MIT. Not sure if they're very OS-integrated in the way you want or not.

RmlUI

See my own implementation: https://github.com/hikogui/hikogui/blob/main/src/hikogui/concurrency/unfair_mutex.hpp

Yes, it is an open source project for a cross platform retained GUI library with a modern c++20 API. https://github.com/hikogui/hikogui

With some growing pains on configuring CMake, I was able to converted a single header file in my project github.com/hikogui/hikogui/ to a module interface file, but it hit an ICE immediately. Of course I reported it, including a crash dump, and a project-branch.

Look at all the pipeline_SDF source files at https://github.com/hikogui/hikogui/tree/main/src/hikogui/GFX

Here is the fragment shader: https://github.com/hikogui/hikogui/blob/main/shaders/pipeline_SDF.frag

Here is the tool to create de-duplicated table and index table from the unicode database: https://github.com/hikogui/hikogui/blob/main/tools/generate_unicode_data.py

Thank you for mentioning HikoGUI.

On windows, you can even use just-in-time-debugging (enabled with registry key), which brings up a dialogue when the application crashes to select a debugger to attach to the "crashed" application. But for this to work correctly you need to do some fanzy things. See: https://github.com/hikogui/hikogui/blob/main/src/hikogui/debugger.hpp and https://github.com/hikogui/hikogui/blob/main/src/hikogui/debugger_win32.cpp