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.

ASSOCIATED GETS

glGet() with argument GL_DRAW_BUFFER

COPYRIGHT

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