glReadBuffer man page on Solaris

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GLREADBUFFER(3gl)					     GLREADBUFFER(3gl)

NAME
       glReadBuffer - select a color buffer source for pixels

C SPECIFICATION
       void glReadBuffer( GLenum mode )

PARAMETERS
       mode  Specifies	a  color  buffer.   Accepted values are GL_FRONT_LEFT,
	     GL_FRONT_RIGHT, GL_BACK_LEFT, GL_BACK_RIGHT,  GL_FRONT,  GL_BACK,
	     GL_LEFT,  GL_RIGHT,  and  GL_AUXi,	 where	i  is  between	0  and
	     GL_AUX_BUFFERS -1.

DESCRIPTION
       glReadBuffer specifies a color buffer  as  the  source  for  subsequent
       glReadPixels,  glCopyTexImage1D, glCopyTexImage2D, glCopyTexSubImage1D,
       glCopyTexSubImage2D, and glCopyPixels commands.	mode  accepts  one  of
       twelve  or more predefined values.  (GL_AUX0 through GL_AUX3 are always
       defined.)   In  a  fully	 configured  system,  GL_FRONT,	 GL_LEFT,  and
       GL_FRONT_LEFT  all  name	 the  front  left  buffer,  GL_FRONT_RIGHT and
       GL_RIGHT name the front right buffer, and GL_BACK_LEFT and GL_BACK name
       the back left buffer.

       Nonstereo  double-buffered  configurations have only a front left and a
       back left buffer.  Single-buffered configurations have a front left and
       a  front	 right	buffer if stereo, and only a front left buffer if non‐
       stereo.	It is an error to specify  a  nonexistent  buffer  to  glRead‐
       Buffer.

       mode  is	 initially  GL_FRONT  in  single-buffered  configurations, and
       GL_BACK in double-buffered configurations.

ERRORS
       GL_INVALID_ENUM is generated if mode is not one of the twelve (or more)
       accepted values.

       GL_INVALID_OPERATION  is generated if mode specifies a buffer that does
       not exist.

       GL_INVALID_OPERATION is generated if glReadBuffer is  executed  between
       the execution of glBegin and the corresponding execution of glEnd.

ASSOCIATED GETS
       glGet with argument GL_READ_BUFFER

SEE ALSO
       glCopyPixels,  glCopyTexImage1D, glCopyTexImage2D, glCopyTexSubImage1D,
       glCopyTexSubImage2D, glDrawBuffer, glReadPixels

				   15 Mar 97		     GLREADBUFFER(3gl)
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