When adding a display, traverse the list of added fullscreen modes and ensure the display ID is set to its final, valid value, or the modes added before calling SDL_AddVideoDisplay() will have an invalid display ID.
Simple DirectMedia Layer is a cross-platform development library designed
to provide low level access to audio, keyboard, mouse, joystick, and graphics
hardware via OpenGL and Direct3D. It is used by video playback software,
emulators, and popular games including Valve's award winning catalog
and many Humble Bundle games.
More extensive documentation is available in the docs directory, starting
with README.md