calling SDL_CreateWindow(..., flags=SDL_WINDOW_OPENGL): this will ultimately lead to an "indirect call to null". I have a working patch for SDL2 (Note: in SDL3, the handling of EGL/emscripten was ...

A simple C++ text renderer using OpenGL, FreeType, and Harfbuzz. Supports subpixel antialiased rendering, ligatures, emojis, as well as having great performance.

ABSTRACT: The choice of methods or design languages is a crucial phase in the development of systems and software, also for real time and embedded systems. An open question that remains in the design ...

Unfortunately SDL doesn't seem to allow the creation of child windows. Perhaps you could use a cross platform GUI framework like wxWindows.