glXCopyContext man page on DigitalUNIX

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glXCopyContext()					      glXCopyContext()

NAME
       glXCopyContext - copy state from one rendering context to another

SYNOPSIS
       void glXCopyContext(
	       Display *dpy,
	       GLXContext src,
	       GLXContext dst,
	       unsigned long mask );

PARAMETERS
       Specifies  the  connection  to the X server.  Specifies the source con‐
       text.  Specifies the destination context.  Specifies which portions  of
       src state are to be copied to dst.

DESCRIPTION
       glXCopyContext()	 copies selected groups of state variables from src to
       dst.  mask indicates which groups of state variables are to be  copied.
       mask contains the bitwise OR of the same symbolic names that are passed
       to  the	GL  command  glPushAttrib().  The  single  symbolic   constant
       GL_ALL_ATTRIB_BITS  can be used to copy the maximum possible portion of
       rendering state.

       The copy can be done only if the renderers named by src and  dst	 share
       an  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.

       Not  all values for GL state can be copied. For example, pixel pack and
       unpack state, render mode state, and select and feedback state are  not
       copied.	 The  state  that  can	be copied is exactly the state that is
       manipulated by the GL command glPushAttrib().

       An implicit glFlush() is done by glXCopyContext() if src is the current
       context for the calling thread.

NOTES
       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.

ERRORS
       BadMatch is generated if rendering contexts src and dst do not share an
       address space or were not created with respect to the same screen.

       BadAccess is generated if dst is current to any thread  (including  the
       calling thread) at the time glXCopyContext() is called.

       GLXBadCurrentWindow  is generated if src is the current context and the
       current drawable is a window that is no longer valid.

       GLXBadContext is generated if either src or dst is not a valid GLX con‐
       text.

SEE ALSO
       glPushAttrib(3), glXCreateContext(3), glXIsDirect(3)

							      glXCopyContext()
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