# SDL_SetWindowSurfaceVSync

Toggle VSync for the window surface.

## Header File

Defined in [<SDL3/SDL_video.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_video.h)

## Syntax

```c
bool SDL_SetWindowSurfaceVSync(SDL_Window *window, int vsync);


#define SDL_WINDOW_SURFACE_VSYNC_DISABLED 0
#define SDL_WINDOW_SURFACE_VSYNC_ADAPTIVE (-1)
```

## Function Parameters

|                            |            |                                     |
| -------------------------- | ---------- | ----------------------------------- |
| [SDL_Window](SDL_Window) * | **window** | the window.                         |
| int                        | **vsync**  | the vertical refresh sync interval. |

## Return Value

(bool) Returns true on success or false on failure; call
[SDL_GetError](SDL_GetError)() for more information.

## Remarks

When a window surface is created, vsync defaults to
[SDL_WINDOW_SURFACE_VSYNC_DISABLED](SDL_WINDOW_SURFACE_VSYNC_DISABLED).

The `vsync` parameter can be 1 to synchronize present with every vertical
refresh, 2 to synchronize present with every second vertical refresh, etc.,
[SDL_WINDOW_SURFACE_VSYNC_ADAPTIVE](SDL_WINDOW_SURFACE_VSYNC_ADAPTIVE) for
late swap tearing (adaptive vsync), or
[SDL_WINDOW_SURFACE_VSYNC_DISABLED](SDL_WINDOW_SURFACE_VSYNC_DISABLED) to
disable. Not every value is supported by every driver, so you should check
the return value to see whether the requested setting is supported.

## Thread Safety

This function should only be called on the main thread.

## Version

This function is available since SDL 3.2.0.

## See Also

- [SDL_GetWindowSurfaceVSync](SDL_GetWindowSurfaceVSync)

----
[CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction), [CategoryVideo](CategoryVideo)

