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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,eqn)_C_
+_C_    eqn is automatically replaced with neqn for nroff
+_header(SelectBuffer,establish a buffer for selection mode values)
+_names(SelectBuffer)
+.SH PARAMETERS
+_phead(_param1)
+Specifies the size of _param2.
+_phead(_param2)
+Returns the selection data.
+.SH DESCRIPTION
+_cmnd has two arguments:
+_param2 is a pointer to an array of unsigned integers,
+and _param1 indicates the size of the array.
+_param2 returns values from the name stack
+(see _cmnd(InitNames), _cmnd(LoadName), _cmnd(PushName))
+when the rendering mode is _const(SELECT) (see _cmnd(RenderMode)).
+_cmnd must be issued before selection mode is enabled,
+and it must not be issued while the rendering mode is _const(SELECT).
+.P
+A programmer can use selection to determine which primitives
+are drawn into some region of a window.
+The region is defined by the current modelview and perspective matrices. 
+.P
+In selection mode, no pixel fragments are produced from rasterization.
+Instead,
+if a primitive or a raster position intersects the clipping 
+volume defined by the viewing frustum
+and the user-defined clipping planes,
+this primitive causes a selection hit.
+(With polygons, no hit occurs if the polygon is culled.)
+When a change is made to the name stack,
+or when _cmnd(RenderMode) is called,
+a hit record is copied to _param2 if any hits have occurred since the
+last such event
+(name stack change or 
+_cmnd(RenderMode) call).
+The hit record consists of the number of names in the name stack at the
+time of the event, followed by the minimum and maximum depth values
+of all vertices that hit since the previous event,
+followed by the name stack contents,
+bottom name first.
+.P
+Depth values (which are in the range [0,1]) are multiplied by 2^32 - 1,
+before being placed in the hit record.
+.P
+An internal index into _param2 is reset to 0 whenever selection mode
+is entered.
+Each time a hit record is copied into _param2,
+the index is incremented to point to the cell just past the end
+of the block of names \- that is, to the next available cell.
+If the hit record is larger than the number of remaining locations in _param2,
+as much data as can fit is copied,
+and the overflow flag is set.
+If the name stack is empty when a hit record is copied,
+that record consists of 0 followed by the minimum and maximum depth values.
+.P
+To exit selection mode, call _cmnd(RenderMode) with an argument
+other than _const(SELECT).
+Whenever _cmnd(RenderMode) is called while the render mode is _const(SELECT),
+it returns the number of hit records copied to _param2,
+resets the overflow flag and the selection buffer pointer,
+and initializes the name stack to be empty.
+If the overflow bit was set when _cmnd(RenderMode) was called,
+a negative hit record count is returned.
+.SH NOTES
+The contents of _param2 is undefined until _cmnd(RenderMode) is called
+with an argument other than _const(SELECT).
+.P
+_cmnd(Begin)/_cmnd(End) primitives and calls to _cmnd(RasterPos)
+can result in hits.
+.SH ERRORS
+_const(INVALID_VALUE) is generated if _param1 is negative.
+.P
+_const(INVALID_OPERATION) is generated if _cmnd is called while the
+render mode is _const(SELECT),
+or if _cmnd(RenderMode) is called with argument _const(SELECT) before
+_cmnd is called at least once.
+.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(NAME_STACK_DEPTH)
+.br
+_cmnd(Get) with argument _const(SELECTION_BUFFER_SIZE)
+.br
+_cmnd(GetPointerv) with argument _const(SELECTION_BUFFER_POINTER)
+.SH SEE ALSO
+_cmnd(FeedbackBuffer),
+_cmnd(InitNames),
+_cmnd(LoadName),
+_cmnd(PushName),
+_cmnd(RenderMode)