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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(Clear,clear buffers to preset values)
-_names(Clear)
-.SH PARAMETERS
-_phead(_param1)
-Bitwise OR of masks that indicate the buffers to be cleared.
-The four masks are
-_const(COLOR_BUFFER_BIT),
-_const(DEPTH_BUFFER_BIT),
-_const(ACCUM_BUFFER_BIT), and
-_const(STENCIL_BUFFER_BIT).
-.SH DESCRIPTION
-_cmnd sets the bitplane area of the window to values previously selected
-by _cmnd(ClearColor), _cmnd(ClearIndex), _cmnd(ClearDepth), 
-_cmnd(ClearStencil), and _cmnd(ClearAccum).
-Multiple color buffers can be cleared simultaneously by selecting
-more than one buffer at a time using _cmnd(DrawBuffer).
-.P
-The pixel ownership test,
-the scissor test,
-dithering, and the buffer writemasks affect the operation of _cmnd.
-The scissor box bounds the cleared region.
-Alpha function,
-blend function,
-logical operation,
-stenciling,
-texture mapping,
-and depth-buffering are ignored by _cmnd.
-.P
-_cmnd takes a single argument that is the bitwise OR of several
-values indicating which buffer is to be cleared.
-.P
-The values are as follows: 
-.TP 28
-_const(COLOR_BUFFER_BIT)
-Indicates the buffers currently enabled for color
-writing.
-.TP
-_const(DEPTH_BUFFER_BIT)
-Indicates the depth buffer.
-.TP
-_const(ACCUM_BUFFER_BIT)
-Indicates the accumulation buffer. 
-.TP
-_const(STENCIL_BUFFER_BIT)
-Indicates the stencil buffer.
-.P
-The value to which each buffer is cleared depends on the setting of the
-clear value for that buffer.  
-.SH NOTES
-If a buffer is not present,
-then a _cmnd directed at that buffer has no effect.
-.SH ERRORS
-_const(INVALID_VALUE) is generated if any bit other than the four defined
-bits is set in _param1.
-.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(ACCUM_CLEAR_VALUE)
-.br
-_cmnd(Get) with argument _const(DEPTH_CLEAR_VALUE)
-.br
-_cmnd(Get) with argument _const(INDEX_CLEAR_VALUE)
-.br
-_cmnd(Get) with argument _const(COLOR_CLEAR_VALUE)
-.br
-_cmnd(Get) with argument _const(STENCIL_CLEAR_VALUE)
-.SH SEE ALSO
-_cmnd(ClearAccum),
-_cmnd(ClearColor),
-_cmnd(ClearDepth),
-_cmnd(ClearIndex),
-_cmnd(ClearStencil),
-_cmnd(ColorMask),
-_cmnd(DepthMask),
-_cmnd(DrawBuffer),
-_cmnd(Scissor),
-_cmnd(StencilMask)