glXCreateContext — create a new GLX rendering context
Specifies the connection to the X server.
Specifies the visual that defines the frame buffer resources available to
the rendering context.
It is a pointer to an
not a visual ID or a pointer to a
Specifies the context with which to share display lists.
NULL indicates that no sharing is to take place.
Specifies whether rendering is to be done with a direct connection
to the graphics system if possible (
or through the X server (
glXCreateContext creates a GLX rendering context and returns its handle.
This context can be used to render into both windows and GLX pixmaps.
glXCreateContext fails to create a rendering context,
NULL is returned.
then a direct rendering context is created if the
implementation supports direct rendering, if the connection is to an X
server that is local, and if a direct rendering context is available. (An implementation may return an indirect context when
then a rendering context that renders through the X server is always created.
Direct rendering provides a performance advantage in some implementations.
However, direct rendering contexts cannot be shared outside a single process,
and they may be unable to render to GLX pixmaps.
shareList is not
then all display-list indexes and definitions are shared by
shareList and by the newly created context.
An arbitrary number of contexts can share a single display-list space.
all rendering contexts that share a single display-list space must
themselves exist in the same address space.
Two rendering contexts share an address space if both are nondirect
using the same server,
or if both are direct and owned by a single process.
Note that in the nondirect case, it is not necessary for the calling
threads to share an address space,
only for their related rendering contexts to share an address space.
If the GL version is 1.1 or greater, then all texture objects except object 0 are shared by any contexts that share display lists.
XVisualInfo is defined in Xutil.h.
It is a structure that includes visual, visualID, screen, and
A process is a single execution environment, implemented in a single address space, consisting of one or more threads.
A thread is one of a set of subprocesses that share a single address space, but maintain separate program counters, stack spaces, and other related global data. A thread that is the only member of its subprocess group is equivalent to a process.
It may not be possible to render to a GLX pixmap with a direct rendering context.
NULL is returned if execution fails on the client side.
BadMatch is generated if the context to be created would not
share the address space or the screen of the context specified by
BadValue is generated if
vis is not a valid visual (for
example, if a particular GLX implementation does not support it).
GLXBadContext is generated if
shareList is not a GLX context
and is not
BadAlloc is generated if the server does not have enough
resources to allocate the new context.
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/.