###### (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!)

## Draft

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# SDL_SetWindowOpacity

Set the opacity for a window.

## Header File

Defined in [SDL_video.h](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_video.h), but apps should use `#include <SDL3/SDL.h>`

## Syntax

```c
int SDL_SetWindowOpacity(SDL_Window *window, float opacity);

```

## Function Parameters

|                 |                                                       |
| --------------- | ----------------------------------------------------- |
| **window**      | the window which will be made transparent or opaque   |
| **opacity**     | the opacity value (0.0f - transparent, 1.0f - opaque) |

## Return Value

Returns 0 on success or a negative error code on failure; call
[SDL_GetError](SDL_GetError)() for more information.

## Remarks

The parameter `opacity` will be clamped internally between 0.0f
(transparent) and 1.0f (opaque).

This function also returns -1 if setting the opacity isn't supported.

## Version

This function is available since SDL 3.0.0.

## See Also

* [SDL_GetWindowOpacity](SDL_GetWindowOpacity)

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