1991-2006
Silicon Graphics, Inc.
glXGetVisualFromFBConfig
3G

# glXGetVisualFromFBConfig

return visual that is associated with the frame buffer configuration

## C Specification

                    XVisualInfo * glXGetVisualFromFBConfig
                    Display * dpy
                    GLXFBConfig config

## Parameters

`dpy`

  Specifies the connection to the X server.

`config`

  Specifies the GLX frame buffer configuration.

## Description

If `config` is a valid GLX frame buffer configuration and it has an associated X Visual, then information describing that visual is returned; otherwise `NULL` is returned. Use `XFree` to free the data returned.

## Notes

`glXGetVisualFromFBConfig` is available only if the GLX version is 1.3 or greater.

If the GLX version is 1.1 or 1.0, the GL version must be 1.0. If the GLX version is 1.2, then the GL version must be 1.1. If the GLX version is 1.3, then the GL version must be 1.2.

`XVisualInfo` is defined in Xutil.h. It is a structure that includes visual, visualID, screen, and depth elements.

## Errors

Returns `NULL` if `config` is not a valid GLXFBConfig.

## See Also

glXGetFBConfigAttrib, glXChooseFBConfig, glXChooseVisual, glXGetConfig

## Copyright

Copyright 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.