---
name: "glXQueryExtension"
section: "3x"
platform: "linux"
package: "xlibmesa-gl-dev"
version: "4.3.0.dfsg.1-14sarge7"
release: "Debian 3.1 (Sarge)"
platforms: ["linux"]
url: "https://new.carta.tech/glXQueryExtension"
---

# glXQueryExtension(3x)

indicate whether the GLX extension is supported

## NAME

glXQueryExtension - indicate whether the GLX extension is supported

## C SPECIFICATION

Bool **glXQueryExtension**( Display *\*dpy*,

```
	int *errorBase,
	int *eventBase )
```

delim $$

## PARAMETERS

- *dpy*

  Specifies the connection to the X server.

- *errorBase*

  Returns the base error code of the GLX server extension.

- *eventBase*

  Returns the base event code of the GLX server extension.

## DESCRIPTION

**glXQueryExtension** returns **True** if the X server of connection *dpy* supports the GLX extension, **False** otherwise. If **True** is returned, then *errorBase* and *eventBase* return the error base and event base of the GLX extension. Otherwise, *errorBase* and *eventBase* are unchanged.

*errorBase* and *eventBase* do not return values if they are specified as **NULL**.

## NOTES

*eventBase* is included for future extensions. GLX does not currently define any events.

## SEE ALSO

**glXQueryVersion**