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NAME
     glXCreateContextWithConfigSGIX - create a new GLX  rendering
     context


C SPECIFICATION
     GLXContext glXCreateContextWithConfigSGIX( Display *dpy,
                                                GLXFBConfigSGIX config,
                                                int render_type,
                                                GLXContext shareList,
                                                Bool direct )


PARAMETERS
     dpy        Specifies the connection to the X server.

     config     Specifies  the  config  that  defines  the  frame
                buffer  resources available to the rendering con-
                text.

     render_type
                Specifies the  rendering  type  of  the  context.
                Allowed   values   are   GLX_RGBA_TYPE_SGIX    or
                GLX_COLOR_INDEX_TYPE_SGIX.

     shareList  Specifies the context with which to share display
                lists.  NULL indicates that no sharing is to take
                place.

     direct     Specifies whether rendering is to be done with  a
                direct  connection to the graphics system if pos-
                sible (True) or through the X server (False).

DESCRIPTION
     glXCreateContextWithConfigSGIX is identical to glXCreateCon-
     text  except  that  the resulting  GLXContext can be used to
     render to any "compatible" GLXDrawable. A GLXContext  and  a
     GLXDrawable are compatible if:

     a.   the render_type attribute for the context is  supported
          by  the  GLXFBConfigSGIX  that the drawable was created
          with.  (e.g.,  if  the   context   was   created   with
          render_type      GLX_RGBA_TYPE_SGIX,      then      the
          GLXFBConfigSGIX's GLX_RENDER_TYPE_SGIX  attribute  must
          have the GLX_RGBA_BIT_SGIX bit set.)

     b.   all color buffers and ancillary buffers that  exist  in
          both GLXFBConfigSGIXs have the same depth. For example,
          a GLXDrawable that had a front left buffer and  a  back
          left  buffer  with red, green and blue sizes of 4 would
          not be compatible with a GLXFBConfigSGIX that had  only
          a  front  left buffer with red, green and blue sizes of
          8. However, it would be compatible with a GLXFBConfigS-
          GIX that had only a front left buffer if the red, green
          and blue sizes were 4.

     No error will be generated if the value of GL_DRAW_BUFFER in
     ctx  indicates a color buffer that is not supported by draw-
     able.  In  this  case,  all  rendering  will  behave  as  if
     GL_DRAW_BUFFER  was   set  to  NONE.  The  same  is true for
     GL_READ_BUFFER: no error will be generated if  it  does  not
     correspond  to  a valid color buffer; subsequent glReadPixel
     and glCopyPixel operations will simply  return invalid data.

     Note that it is an error to later call  glDrawBuffer  and/or
     glReadBuffer  (even  if they are implicitly called via glPo-
     pAttrib) and specify a color buffer that is not supported by
     drawable.   Also  subsequent  calls  to  glCopyPixels,  that
     specify an unsupported ancillary buffer, will result  in  an
     error.

NOTES
     GLX_SGIX_fbconfig extension should  be  supported  for  this
     function to be valid.

ERRORS
     GLXBadContext is generated if sharelist is neither zero  nor
     a valid GLX rendering context.

     GLXBadFBConfigSGIX is generated if config  is  not  a  valid
     GLXFBConfigSGIX.

     BadMatch is generated if the context to be created would not
     share  the address space or the screen of the context speci-
     fied by shareList.

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

     BadValue if render_type does not refer to a valid  rendering
     type.

     NULL is returned if execution fails on the client side.

SEE ALSO
     glXMakeCurrent, glDrawBuffer,.  glReadBuffer,  glCopyPixels,
     glReadPixels,  glPopAttrib,  glXCreateContext, glXGetConfig-
     FromVisualSGIX,            glXCreateGLXPixmapWithConfigSGIX,
     glXChooseFBConfigSGIX,         glXGetFBConfigFromVisualSGIX,
     glXGetFBConfigAttribSGIX

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