The flags on a window.
Defined in <SDL3/SDL_video.h>
typedef Uint64 SDL_WindowFlags;
#define SDL_WINDOW_FULLSCREEN SDL_UINT64_C(0x0000000000000001) /**< window is in fullscreen mode */
#define SDL_WINDOW_OPENGL SDL_UINT64_C(0x0000000000000002) /**< window usable with OpenGL context */
#define SDL_WINDOW_OCCLUDED SDL_UINT64_C(0x0000000000000004) /**< window is occluded */
#define SDL_WINDOW_HIDDEN SDL_UINT64_C(0x0000000000000008) /**< window is neither mapped onto the desktop nor shown in the taskbar/dock/window list; SDL_ShowWindow() is required for it to become visible */
#define SDL_WINDOW_BORDERLESS SDL_UINT64_C(0x0000000000000010) /**< no window decoration */
#define SDL_WINDOW_RESIZABLE SDL_UINT64_C(0x0000000000000020) /**< window can be resized */
#define SDL_WINDOW_MINIMIZED SDL_UINT64_C(0x0000000000000040) /**< window is minimized */
#define SDL_WINDOW_MAXIMIZED SDL_UINT64_C(0x0000000000000080) /**< window is maximized */
#define SDL_WINDOW_MOUSE_GRABBED SDL_UINT64_C(0x0000000000000100) /**< window has grabbed mouse input */
#define SDL_WINDOW_INPUT_FOCUS SDL_UINT64_C(0x0000000000000200) /**< window has input focus */
#define SDL_WINDOW_MOUSE_FOCUS SDL_UINT64_C(0x0000000000000400) /**< window has mouse focus */
#define SDL_WINDOW_EXTERNAL SDL_UINT64_C(0x0000000000000800) /**< window not created by SDL */
#define SDL_WINDOW_MODAL SDL_UINT64_C(0x0000000000001000) /**< window is modal */
#define SDL_WINDOW_HIGH_PIXEL_DENSITY SDL_UINT64_C(0x0000000000002000) /**< window uses high pixel density back buffer if possible */
#define SDL_WINDOW_MOUSE_CAPTURE SDL_UINT64_C(0x0000000000004000) /**< window has mouse captured (unrelated to MOUSE_GRABBED) */
#define SDL_WINDOW_MOUSE_RELATIVE_MODE SDL_UINT64_C(0x0000000000008000) /**< window has relative mode enabled */
#define SDL_WINDOW_ALWAYS_ON_TOP SDL_UINT64_C(0x0000000000010000) /**< window should always be above others */
#define SDL_WINDOW_UTILITY SDL_UINT64_C(0x0000000000020000) /**< window should be treated as a utility window, not showing in the task bar and window list */
#define SDL_WINDOW_TOOLTIP SDL_UINT64_C(0x0000000000040000) /**< window should be treated as a tooltip and does not get mouse or keyboard focus, requires a parent window */
#define SDL_WINDOW_POPUP_MENU SDL_UINT64_C(0x0000000000080000) /**< window should be treated as a popup menu, requires a parent window */
#define SDL_WINDOW_KEYBOARD_GRABBED SDL_UINT64_C(0x0000000000100000) /**< window has grabbed keyboard input */
#define SDL_WINDOW_VULKAN SDL_UINT64_C(0x0000000010000000) /**< window usable for Vulkan surface */
#define SDL_WINDOW_METAL SDL_UINT64_C(0x0000000020000000) /**< window usable for Metal view */
#define SDL_WINDOW_TRANSPARENT SDL_UINT64_C(0x0000000040000000) /**< window with transparent buffer */
#define SDL_WINDOW_NOT_FOCUSABLE SDL_UINT64_C(0x0000000080000000) /**< window should not be focusable */These cover a lot of true/false, or on/off, window state. Some of it is immutable after being set through SDL_CreateWindow(), some of it can be changed on existing windows by the app, and some of it might be altered by the user or system outside of the app's control.
This datatype is available since SDL 3.1.3.