DOKK / manpages / debian 13 / libsdl3-doc / SDL_WINDOWPOS_UNDEFINED.3.en
SDL_WINDOWPOS_UNDEFINED(3) SDL3 FUNCTIONS SDL_WINDOWPOS_UNDEFINED(3)

SDL_WINDOWPOS_UNDEFINED - Used to indicate that you don't care what the window position/display is.

Defined in SDL3/SDL_video.h

#include "SDL3/SDL.h"
#define SDL_WINDOWPOS_UNDEFINED         SDL_WINDOWPOS_UNDEFINED_DISPLAY(0)

This always uses the primary display.

This macro is available since SDL 3.2.0.

SDL 3.2.10 Simple Directmedia Layer