glDrawBuffer man page on RedHat
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GLDRAWBUFFER(3G) OpenGL Manual GLDRAWBUFFER(3G)
NAME
glDrawBuffer - specify which color buffers are to be drawn into
C SPECIFICATION
void glDrawBuffer(GLenum mode);
PARAMETERS
mode
Specifies up to four color buffers to be drawn into. Symbolic
constants GL_NONE, GL_FRONT_LEFT, GL_FRONT_RIGHT, GL_BACK_LEFT,
GL_BACK_RIGHT, GL_FRONT, GL_BACK, GL_LEFT, GL_RIGHT, and
GL_FRONT_AND_BACK are accepted. The initial value is GL_FRONT for
single-buffered contexts, and GL_BACK for double-buffered contexts.
DESCRIPTION
When colors are written to the frame buffer, they are written into the
color buffers specified by glDrawBuffer. The specifications are as
follows:
GL_NONE
No color buffers are written.
GL_FRONT_LEFT
Only the front left color buffer is written.
GL_FRONT_RIGHT
Only the front right color buffer is written.
GL_BACK_LEFT
Only the back left color buffer is written.
GL_BACK_RIGHT
Only the back right color buffer is written.
GL_FRONT
Only the front left and front right color buffers are written. If
there is no front right color buffer, only the front left color
buffer is written.
GL_BACK
Only the back left and back right color buffers are written. If
there is no back right color buffer, only the back left color
buffer is written.
GL_LEFT
Only the front left and back left color buffers are written. If
there is no back left color buffer, only the front left color
buffer is written.
GL_RIGHT
Only the front right and back right color buffers are written. If
there is no back right color buffer, only the front right color
buffer is written.
GL_FRONT_AND_BACK
All the front and back color buffers (front left, front right, back
left, back right) are written. If there are no back color buffers,
only the front left and front right color buffers are written. If
there are no right color buffers, only the front left and back left
color buffers are written. If there are no right or back color
buffers, only the front left color buffer is written.
If more than one color buffer is selected for drawing, then blending or
logical operations are computed and applied independently for each
color buffer and can produce different results in each buffer.
Monoscopic contexts include only left buffers, and stereoscopic
contexts include both left and right buffers. Likewise, single-buffered
contexts include only front buffers, and double-buffered contexts
include both front and back buffers. The context is selected at GL
initialization.
ERRORS
GL_INVALID_ENUM is generated if mode is not an accepted value.
GL_INVALID_OPERATION is generated if none of the buffers indicated by
mode exists.
ASSOCIATED GETS
glGet() with argument GL_DRAW_BUFFER
SEE ALSO
glBlendFunc(), glColorMask(), glDrawBuffers(), glLogicOp(),
glReadBuffer()
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/.
AUTHORS
opengl.org
opengl.org 03/16/2013 GLDRAWBUFFER(3G)
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