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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)