glXCreateContext man page on OSF1

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glXCreateContext()					    glXCreateContext()

NAME
       glXCreateContext - create a new GLX rendering context

SYNOPSIS
       GLXContext glXCreateContext(
	       Display *dpy,
	       XVisualInfo *vis,
	       GLXContext shareList,
	       Bool direct );

PARAMETERS
       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  XVisualInfo structure, not a visual ID or a
       pointer to a Visual.  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	graph‐
       ics system if possible (True) or through the X server (False).

DESCRIPTION
       glXCreateContext() creates a GLX rendering context and returns its han‐
       dle. This context can be used to	 render	 into  both  windows  and  GLX
       pixmaps.	 If  glXCreateContext()	 fails	to create a rendering context,
       NULL is returned.

       If direct is True, 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 direct is True).
       If direct is False, 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.

       If shareList is not NULL, then all display-list indexes and definitions
       are  shared  by	context shareList and by the newly created context. An
       arbitrary number of contexts can share  a  single  display-list	space.
       However,	 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.

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

       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 render‐
       ing context.

ERRORS
       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 shareList.

       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
       NULL.

       BadAlloc	 is  generated if the server does not have enough resources to
       allocate the new context.

SEE ALSO
       glXDestroyContext(3),  glXGetConfig(3),	 glXIsDirect(3),   glXMakeCur‐
       rent(3)

							    glXCreateContext()
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