glXQueryContext.3G man page

glXQueryContext — query context information

C Specification

int glXQueryContext(Display * dpy, GLXContext ctx, int attribute, int * value);

Parameters

dpy

Specifies the connection to the X server.

ctx

Specifies a GLX rendering context.

attribute

Specifies that a context parameter should be retrieved. Must be one of GLX_FBCONFIG_ID, GLX_RENDER_TYPE, or GLX_SCREEN.

value

Contains the return value for attribute.

Description

glXQueryContext sets value to the value of attribute with respect to ctx. attribute may be one of the following:

GLX_FBCONFIG_ID

Returns the XID of the GLXFBConfig associated with ctx.

GLX_RENDER_TYPE

Returns the rendering type supported by ctx.

GLX_SCREEN

Returns the screen number associated with ctx.

Success is returned unless attribute is not a valid GLX context attribute, in which case GLX_BAD_ATTRIBUTE is returned.

This call may cause a round-trip to the server.

Notes

glXQueryContext 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.

Errors

GLXBadContext is generated if ctx does not refer to a valid context.

See Also

glXCreateNewContext(), glXGetCurrentContext(), glXQueryVersion(), glXQueryExtensionsString()

Authors

opengl.org

Info

02/04/2016 opengl.org OpenGL Manual