glReadBuffer man page on MacOSX

glReadBuffer man page on MacOSX

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GLREADBUFFER(3G)		  OpenGL 3.3		      GLREADBUFFER(3G)

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, and GL_RIGHT.

DESCRIPTION
       glReadBuffer specifies a color buffer as the source for subsequent
       glReadPixels(), glCopyTexImage1D(), glCopyTexImage2D(),
       glCopyTexSubImage1D(), glCopyTexSubImage2D(), and glCopyTexSubImage3D()
       commands.  mode accepts one of twelve or more predefined values. 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
       nonstereo. It is an error to specify a nonexistent buffer to
       glReadBuffer.

       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.

ASSOCIATED GETS
       glGet() with argument GL_READ_BUFFER

SEE ALSO
       glCopyTexImage1D(), glCopyTexImage2D(), glCopyTexSubImage1D(),
       glCopyTexSubImage2D(), glCopyTexSubImage3D(), glDrawBuffer(),
       glReadPixels()

COPYRIGHT
       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
       under the SGI Free Software B License. For details, see
       http://oss.sgi.com/projects/FreeB/.

OpenGL 3.3			  03/08/2011		      GLREADBUFFER(3G)

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