Provided by: libsdl3-doc_3.2.8+ds-1_all 

NAME
SDL_GetPrimaryDisplay - Return the primary display.
HEADER FILE
Defined in SDL3/SDL_video.h
SYNOPSIS
#include "SDL3/SDL.h" SDL_DisplayID SDL_GetPrimaryDisplay(void);
RETURN VALUE
( SDL_DisplayID ) Returns the instance ID of the primary display on success or 0 on failure; call SDL_GetError () for more information.
THREAD SAFETY
This function should only be called on the main thread.
AVAILABILITY
This function is available since SDL 3.2.0.
SEE ALSO
•(3), SDL_GetDisplays(3) Simple Directmedia Layer SDL 3.2.8 SDL_GetPrimaryDisplay(3)