Provided by: libsdl3-doc_3.2.20+ds-2_all 

NAME
SDL_GetWindowFullscreenMode - Query the display mode to use when a window is visible at fullscreen.
SYNOPSIS
#include <SDL3/SDL_video.h>
const SDL_DisplayMode * SDL_GetWindowFullscreenMode(SDL_Window *window);
FUNCTION PARAMETERS
window the window to query.
RETURN VALUE
Returns a pointer to the exclusive fullscreen mode to use or NULL for borderless fullscreen desktop mode.
THREAD SAFETY
This function should only be called on the main thread.
AVAILABILITY
This function is available since SDL 3.2.0.
SEE ALSO
SDL_SetWindowFullscreenMode(3), SDL_SetWindowFullscreen(3)
Simple Directmedia Layer SDL 3.2.20 SDL_GetWindowFullscreenMode(3)