glReadBuffer man page on DigitalUNIX

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glReadBuffer(3G)					      glReadBuffer(3G)

NAME
       glReadBuffer - select a color buffer source for pixels

SYNOPSIS
       void glReadBuffer(
	       GLenum mode );

PARAMETERS
       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(), glCopyTexSubIm‐
       age1D(), glCopyTexSubImage2D(), glCopyTexSubImage3D(),  and  glCopyPix‐
       els()  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(3),	 glCopyTexImage1D(3),  glCopyTexImage2D(3), glCopyTex‐
       SubImage1D(3), glCopyTexSubImage2D(3), glCopyTexSubImage3D(3),  glDraw‐
       Buffer(3), glReadPixels(3)

							      glReadBuffer(3G)
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