[ новости /+++ | форум | теги | ]

NAME
     glXCopyContext - copy state from one  rendering  context  to
     another


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


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 vari-
     ables 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  cal-
     ling  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 pro-
     cess.

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  con-
     text  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

Партнёры:

Хостинг: