# SDL_WINDOWPOS_UNDEFINED_DISPLAY Used to indicate that you don't care what the window position is. ## Header File Defined in [<SDL3/SDL_video.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_video.h) ## Syntax ```c #define SDL_WINDOWPOS_UNDEFINED_DISPLAY(X) (SDL_WINDOWPOS_UNDEFINED_MASK|(X)) ``` ## Macro Parameters | | | | ----- | --------------------------------------------------------- | | **X** | the [SDL_DisplayID](SDL_DisplayID) of the display to use. | ## Remarks If you _really_ don't care, [SDL_WINDOWPOS_UNDEFINED](SDL_WINDOWPOS_UNDEFINED) is the same, but always uses the primary display instead of specifying one. ## Version This macro is available since SDL 3.2.0. ---- [CategoryAPI](CategoryAPI), [CategoryAPIMacro](CategoryAPIMacro), [CategoryVideo](CategoryVideo)