---
name: "SDL_GL_GetSwapInterval"
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_GL_GetSwapInterval"
---

# SDL\_GL\_GetSwapInterval(3)

Get the swap interval for the current OpenGL context.

## NAME

SDL\_GL\_GetSwapInterval - Get the swap interval for the current OpenGL context.

## HEADER FILE

Defined in SDL3/SDL\_video.h

## SYNOPSIS

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

**bool SDL\_GL\_GetSwapInterval(int \*interval);**

## DESCRIPTION

If the system can't determine the swap interval, or there isn't a valid current context, this function will set \*interval to 0 as a safe default.

## FUNCTION PARAMETERS

- *interval*

  output interval value. 0 if there is no vertical retrace synchronization, 1 if the buffer swap is synchronized with the vertical retrace, and -1 if late swaps happen immediately instead of waiting for the next retrace.

## 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\_GL\_SetSwapInterval**(3)](/SDL_GL_SetSwapInterval/3.md)