glreadbuffer(3g) [redhat man page]

GLREADBUFFER(3G)														  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, 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,  glCopyTexSubImage3D,  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 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.

       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(3G),  glCopyTexImage1D(3G),  glCopyTexImage2D(3G),	glCopyTexSubImage1D(3G), glCopyTexSubImage2D(3G), glCopyTexSubImage3D(3G),
       glDrawBuffer(3G), glReadPixels(3G)

																  GLREADBUFFER(3G)

GLREADBUFFER(3G)						   OpenGL Manual						  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,
	   GL_RIGHT, and the constants GL_COLOR_ATTACHMENTi.

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. Further more, the constants GL_COLOR_ATTACHMENTi may be used to
       indicate the ith color attachment where i ranges from zero to the value of GL_MAX_COLOR_ATTACHMENTS minus one.

       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 (C) 1991-2006 Silicon Graphics, Inc. Copyright (C) 2011 Khronos Group. This document is licensed under the SGI Free Software B
       License. For details, see http://oss.sgi.com/projects/FreeB/.

AUTHORS

       opengl.org

opengl.org							    06/10/2014							  GLREADBUFFER(3G)