---
name: "SDL_GetWindowOpacity"
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_GetWindowOpacity"
---

# SDL\_GetWindowOpacity(3)

Get the opacity of a window.

## NAME

SDL\_GetWindowOpacity - Get the opacity of a window.

## HEADER FILE

Defined in SDL3/SDL\_video.h

## SYNOPSIS

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

**float SDL\_GetWindowOpacity(SDL\_Window \*window);**

## DESCRIPTION

If transparency isn't supported on this platform, opacity will be returned as 1.0f without error.

## FUNCTION PARAMETERS

- *window*

  the window to get the current opacity value from.

## RETURN VALUE

Returns the opacity, (0.0f - transparent, 1.0f - opaque), or -1.0f 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\_SetWindowOpacity**(3)](/SDL_SetWindowOpacity/3.md)