glXQueryContextInfoEXT

query context information

Signature

glXQueryContextInfoEXT( Display * ( dpy ) , GLXContext ( ctx ) , int ( attribute ) , int * ( value ) )-> int

Parameters

VariablesDescription
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_SHARED_CONTEXT_EXT , GLX_VISUAL_ID_EXT , or GLX_SCREEN_EXT .
value
Contains the return value for attribute .

Description

glXQueryContextInfoEXT sets value to the value of attribute with respect to ctx . glXQueryContextInfoEXT returns an error code if it fails for any reason. Otherwise, Success is returned.
attribute may be one of the following:
GLX_SHARED_CONTEXT_EXT
Returns the XID of the share list context associated with ctx at its creation.
GLX_VISUAL_ID_EXT
Returns the XID of the GLX Visual associated with ctx .
GLX_SCREEN_EXT
Returns the screen number associated with ctx .
This call may cause a round-trip to the server.
glXQueryContextInfoEXT is part of the
GLX_EXT_import_context
extension, not part of the core GLX command set. If
GLX_EXT_import_context
is included in the string returned by glXQueryExtensionsString , the extension is supported.

Errors

GLXBadContext is generated if ctx does not refer to a valid context.
GLX_BAD_ATTRIBUTE is returned if attribute is not a valid GLX context attribute.
fred GLX_BAD_CONTEXT is returned if attribute is not a valid context.

See Also

glXCreateContext , glXQueryVersion , glXQueryExtensionsString

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