glDrawBuffer — specify which color buffers are to be drawn into
void glDrawBuffer( | GLenum | mode) ; |
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
,
GL_FRONT_AND_BACK
, and
GL_AUX
i,
where i is between 0 and the value of GL_AUX_BUFFERS
minus 1,
are accepted. (GL_AUX_BUFFERS
is not the upper limit; use glGet
to query the number of available aux buffers.)
The initial value is GL_FRONT
for single-buffered contexts,
and GL_BACK
for double-buffered contexts.
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.
GL_AUX
iOnly auxiliary color buffer i 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.
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.
GL_INVALID_OPERATION
is generated if glDrawBuffer
is executed between the execution of glBegin
and the corresponding execution of glEnd.
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/.