SDL_SetWindowFullscreen - Man Page

#include <SDL3/SDL_video.h>

bool SDL_SetWindowFullscreen(SDL_Window *window, bool fullscreen);

By default a window in fullscreen state uses borderless fullscreen desktop mode, but a specific exclusive display mode can be set using SDL_SetWindowFullscreenMode().

On some windowing systems this request is asynchronous and the new fullscreen state may not have have been applied immediately upon the return of this function. If an immediate change is required, call SDL_SyncWindow() to block until the changes have taken effect.

When the window state changes, an SDL_EVENT_WINDOW_ENTER_FULLSCREEN or SDL_EVENT_WINDOW_LEAVE_FULLSCREEN event will be emitted. Note that, as this is just a request, it can be denied by the windowing system.

window

the window to change.

fullscreen

true for fullscreen mode, false for windowed mode.

for more information.

This function should only be called on the main thread.

This function is available since SDL 3.2.0.

SDL_GetWindowFullscreenMode(3), SDL_SetWindowFullscreenMode(3), SDL_SyncWindow(3), SDL_WINDOW_FULLSCREEN(3)

SDL_GetWindowFlags(3), SDL_GetWindowFullscreenMode(3), SDL_SetWindowFullscreenMode(3), SDL_SyncWindow(3).