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-_C_ License Applicability. Except to the extent portions of this file are
-_C_ made subject to an alternative license as permitted in the SGI Free
-_C_ Software License B, Version 1.1 (the "License"), the contents of this
-_C_ file are subject only to the provisions of the License. You may not use
-_C_ this file except in compliance with the License. You may obtain a copy
-_C_ of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
-_C_ Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
-_C_ 
-_C_ http://oss.sgi.com/projects/FreeB
-_C_ 
-_C_ Note that, as provided in the License, the Software is distributed on an
-_C_ "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
-_C_ DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
-_C_ CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
-_C_ PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
-_C_ 
-_C_ Original Code. The Original Code is: OpenGL Sample Implementation,
-_C_ Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
-_C_ Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
-_C_ Copyright in any portions created by third parties is as indicated
-_C_ elsewhere herein. All Rights Reserved.
-_C_ 
-_C_ Additional Notice Provisions: The application programming interfaces
-_C_ established by SGI in conjunction with the Original Code are The
-_C_ OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
-_C_ April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
-_C_ 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
-_C_ Window System(R) (Version 1.3), released October 19, 1998. This software
-_C_ was created using the OpenGL(R) version 1.2.1 Sample Implementation
-_C_ published by SGI, but has not been independently verified as being
-_C_ compliant with the OpenGL(R) version 1.2.1 Specification.
-_C_
-_C_ The first character in this file must be an '_'!
-_C_ Anything on a line after _C_ is ignored
-_define(_filters,tbl|eqn)_C_
-_C_      eqn is automatically replaced with neqn for nroff
-_header(DrawBuffer,specify which color buffers are to be drawn into)
-_names(DrawBuffer)
-.EQ
-delim $$
-.EN
-.SH PARAMETERS
-_phead(_param1)
-Specifies up to four color buffers to be drawn into.
-Symbolic constants
-_const(NONE), 
-_const(FRONT_LEFT),
-_const(FRONT_RIGHT),
-_const(BACK_LEFT),
-_const(BACK_RIGHT),
-_const(FRONT),
-_const(BACK),
-_const(LEFT),
-_const(RIGHT),
-_const(FRONT_AND_BACK), and
-_const(AUX)\f2i\fP,
-where \f2i\fP is between 0 and
-.br
-``_const(AUX_BUFFERS)'' \-1,
-are accepted (_const(AUX_BUFFERS) is not the upper limit; use _cmnd(Get)
-to query the number of available aux buffers.)
-The initial value is _const(FRONT) for single-buffered contexts,
-and _const(BACK) for double-buffered contexts.
-.SH DESCRIPTION
-When colors are written to the frame buffer,
-they are written into the color buffers specified by _cmnd.
-The specifications are as follows:
-.TP 25
-_const(NONE)
-No color buffers are written.
-.TP
-_const(FRONT_LEFT)
-Only the front left color buffer is written.
-.TP
-_const(FRONT_RIGHT)
-Only the front right color buffer is written.
-.TP
-_const(BACK_LEFT)
-Only the back left color buffer is written.
-.TP
-_const(BACK_RIGHT)
-Only the back right color buffer is written.
-.TP
-_const(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.
-.TP
-_const(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.
-.TP
-_const(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.
-.TP
-_const(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.
-.BP
-.TP
-_const(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.
-.TP
-_const(AUX)\f2i\fP
-Only auxiliary color buffer \f2i\fP is written.
-.P
-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.
-.P
-Monoscopic contexts include only 
-.I left 
-buffers, and stereoscopic contexts include both
-.I left
-and
-.I right
-buffers.
-Likewise, single-buffered contexts include only
-.I front
-buffers, and double-buffered contexts include both 
-.I front
-and
-.I back
-buffers.
-The context is selected at GL initialization.
-.SH NOTES
-It is always the case that _const(AUX)$i$ = _const(AUX0) + $i$.
-.SH ERRORS
-_const(INVALID_ENUM) is generated if _param1 is not an accepted value.
-.P
-_const(INVALID_OPERATION) is generated if none of the buffers indicated
-by _param1 exists.
-.P
-_const(INVALID_OPERATION) is generated if _cmnd
-is executed between the execution of _cmnd(Begin)
-and the corresponding execution of _cmnd(End).
-.SH ASSOCIATED GETS
-_cmnd(Get) with argument _const(DRAW_BUFFER)
-.br
-_cmnd(Get) with argument _const(AUX_BUFFERS)
-.SH SEE ALSO
-_cmnd(BlendFunc),
-_cmnd(ColorMask),
-_cmnd(IndexMask),
-_cmnd(LogicOp),
-_cmnd(ReadBuffer)