icetGLSetReadBuffer -- set OpenGL buffer for images

       The check of mode is perfunctory. It just checks mode against a list of known buffers. It does not  check
       to  see  if  the  buffer  actually  exists  or  for  any other buffers that might be defined in an OpenGL
       extension.

       Copyright (C)2010 Sandia Corporation

       Under the terms of Contract DE-AC04-94AL85000  with  Sandia  Corporation,  the  U.S.  Government  retains
       certain rights in this software.

       This source code is released under the New BSD License.

       Set  the  OpenGL  buffer  from  which  to read images to composite. After the draw callback (specified by
       icetGLDrawCallback) returns, IceT grabs the rendered image from the  OpenGL  buffer  specified  by  mode.
       This buffer is also used to write back fully composited images if the ICET_GL_DISPLAY option is on.

       mode  is  an  OpenGL  value  that  specifies  the  buffer. It is passed to glReadBuffer and glDrawBuffer.
       Accepted values are GL_FRONT, GL_BACK, GL_LEFT, GL_RIGHT,  GL_FRONT_LEFT,  GL_FRONT_RIGHT,  GL_BACK_LEFT,
       GL_BACK_RIGHT, and any of the GL_AUXi identifiers.

       The  current  read  buffer used is stored in the ICET_GL_READ_BUFFER state variable. The default value is
       GL_BACK.

ICET_INVALID_OPERATIONicetGLInitialize has not been called for this IceT context.

       ICET_INVALID_ENUMmode is not a known OpenGL buffer identifier.

icetGLSetReadBuffer--setOpenGLbufferforimages

icetGLDrawCallback(3)

IceT Reference                                   August  9, 2010                          icetGLSetReadBuffer(3)

       #include <IceTGL.h>

       void icetGLSetReadBuffer(   GLenum   mode  );

       None.