I want to use SDL_CreateWindowForm to initialize SDL2 video on an existing window using Firemonkey.
Since FMX is a cross-platform, I need to find the native window handle for each platform. In my case, it is Windows.
Using FMX.Platform.Win unit, I can call:
nativeHandle := WindowHandleToPlatform( myForm.Handle).Wnd; ... //then pass the handle to SDL2, the secret is to pass it casting to Pointer) fWindow := SDL_CreateWindowFrom(pointer(nativeHandle);
This was the method I used to make it work!