glXCopyContext

GLXCOPYCONTEXT()					     GLXCOPYCONTEXT()



NAME
       glXCopyContext - copy state from one rendering context to another


C SPECIFICATION
       void glXCopyContext( Display *dpy,
			    GLXContext src,
			    GLXContext dst,
			    unsigned long mask )

       delim $$

PARAMETERS
       dpy   Specifies the connection to the X server.

       src   Specifies the source context.

       dst   Specifies the destination context.

       mask  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  subpro-
       cess 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
       context.

SEE ALSO
       glPushAttrib, glXCreateContext, glXIsDirect



							     GLXCOPYCONTEXT()