titlebar.c

/* gcc -g -o titlebar titlebar.c `sdl2-config --cflags --libs`
 * SDL_VIDEODRIVER=wayland ./titlebar
 */

#include <SDL.h>

int main(int argc, char **argv)
{
	SDL_Window *window;
	SDL_Renderer *renderer;
	SDL_Event evt;
	SDL_bool run = SDL_TRUE;

	SDL_Init(SDL_INIT_VIDEO);
	SDL_CreateWindowAndRenderer(
		640,
		480,
		SDL_WINDOW_FULLSCREEN_DESKTOP,
		&window,
		&renderer
	);

	while (run)
	{
		while (SDL_PollEvent(&evt) > 0)
		{
			if (evt.type == SDL_QUIT)
			{
				run = SDL_FALSE;
			}
			else if (evt.type == SDL_KEYDOWN)
			{
				if (evt.key.keysym.sym == SDLK_SPACE)
				{
					SDL_SetWindowFullscreen(window, 0);
				}
			}
		}

		SDL_RenderClear(renderer);
		SDL_RenderPresent(renderer);
	}

	SDL_DestroyRenderer(renderer);
	SDL_DestroyWindow(window);
	SDL_Quit();
	return 0;
}