glReadBuffer man page on RedHat
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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 © 1991-2006 Silicon Graphics, Inc. Copyright © 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 03/16/2013 GLREADBUFFER(3G)
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