---
name: "SDL_SetWindowOpacity"
section: "3"
platform: "linux"
package: "libsdl3-doc"
version: "3.2.10+ds-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/SDL_SetWindowOpacity"
---

# SDL\_SetWindowOpacity(3)

Set the opacity for a window.

## NAME

SDL\_SetWindowOpacity - Set the opacity for a window.

## HEADER FILE

Defined in SDL3/SDL\_video.h

## SYNOPSIS

```
#include "SDL3/SDL.h"
```

**bool SDL\_SetWindowOpacity(SDL\_Window \*window, float opacity);**

## DESCRIPTION

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

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

## 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 true on success or false on failure; call

**SDL\_GetError** () for more information.

## THREAD SAFETY

This function should only be called on the main thread.

## AVAILABILITY

This function is available since SDL 3.2.0.

## SEE ALSO

**•**(3), [**SDL\_GetWindowOpacity**(3)](/SDL_GetWindowOpacity/3.md)