My issue is that, until this change is accepted, I have to override SDL2’s window-procedure to perform the same task in my own code, i.e. after getting the HWND from SDL_GetWindowWMInfo(), I call Win32’s GetWindowLongPtr() with GWLP_WNDPROC (or GWL_WNDPROC, as the case may be), and save that in my app’s screen-oriented class (i.e. the same one that stores the pointer to the SDL_Window). I then call Win32’s SetWindowLongPtr() with GWLP_WNDPROC/GWL_WNDPROC with my override.
In my replacement window-procedure, I have to call the one I fished out of SDL. But all I have at that time is an HWND, and there seems to be no way to find an SDL_Window from an HWND, nor any way to iterate through all existing SDL_Window instances.
Such a function could easily be added to SDL_video.c, e.g. SDL_Window *SDL_GetFirstWindow() { return _this->windows; } and SDL_Window *SDL_GetNextWindow(SDL_Window *window) { return (window == NULL) ? NULL : window->next; }.
Is there some other API I’m not seeing? Is there a good reason why there’s no existing method to iterate through existing SDL windows?
For now, I’ll obviously have to create my own linked list, to match HWND to SDL_Window* .