###### (This is the documentation for SDL3, which is under heavy development and the API is changing! [SDL2](https://wiki.libsdl.org/SDL2/) is the current stable version!) # SDL_UpdateWindowSurface Copy the window surface to the screen. ## Syntax ```c int SDL_UpdateWindowSurface(SDL_Window *window); ``` ## Function Parameters | | | | -------------- | -------------------- | | **window** | the window to update | ## Return Value Returns 0 on success or a negative error code on failure; call [SDL_GetError](SDL_GetError)() for more information. ## Remarks This is the function you use to reflect any changes to the surface on the screen. This function is equivalent to the SDL 1.2 API [SDL_Flip](SDL_Flip)(). ## Version This function is available since SDL 3.0.0. ## Related Functions * [SDL_GetWindowSurface](SDL_GetWindowSurface) * [SDL_UpdateWindowSurfaceRects](SDL_UpdateWindowSurfaceRects) ---- [CategoryAPI](CategoryAPI), [CategoryVideo](CategoryVideo)