glXQueryContext(3G)

NAME
     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