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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(StencilFunc,set function and reference value for stencil testing)
-.EQ
-delim $$
-.EN
-_names(StencilFunc)
-.SH PARAMETERS
-_phead(_param1)
-Specifies the test function.
-Eight tokens are valid:
-_const(NEVER),
-_const(LESS),
-_const(LEQUAL),
-_const(GREATER),
-_const(GEQUAL),
-_const(EQUAL),
-_const(NOTEQUAL), and
-_const(ALWAYS). The initial value is _const(ALWAYS). 
-_phead(_param2)
-Specifies the reference value for the stencil test.
-_param2 is clamped to the range [0,$2 sup n - 1$],
-where $n$ is the number of bitplanes in the stencil buffer. The
-initial value is 0.
-_phead(_param3)
-Specifies a mask that is ANDed with both the reference value
-and the stored stencil value when the test is done. The initial value
-is all 1's. 
-.SH DESCRIPTION
-Stenciling,
-like depth-buffering,
-enables and disables drawing on a per-pixel basis.
-You draw into the stencil planes using GL drawing primitives,
-then render geometry and images,
-using the stencil planes to mask out portions of the screen.
-Stenciling is typically used in multipass rendering algorithms
-to achieve special effects,
-such as decals,
-outlining,
-and constructive solid geometry rendering.
-.P
-The stencil test conditionally eliminates a pixel based on the outcome
-of a comparison between the reference value
-and the value in the stencil buffer.
-To enable and disable the test, call _cmnd(Enable) and _cmnd(Disable)
-with argument _const(STENCIL_TEST).
-To specify actions based on the outcome of the stencil test, call
-_cmnd(StencilOp).
-.P
-_param1 is a symbolic constant that determines the stencil comparison function.
-It accepts one of eight values,
-shown in the following list.
-_param2 is an integer reference value that is used in the stencil comparison.
-It is clamped to the range [0,$2 sup n - 1$],
-where $n$ is the number of bitplanes in the stencil buffer.
-_param3 is bitwise ANDed with both the reference value
-and the stored stencil value,
-with the ANDed values participating in the comparison.
-.P 
-If \f2stencil\fP represents the value stored in the corresponding
-stencil buffer location,
-the following list shows the effect of each comparison function
-that can be specified by _param1.
-Only if the comparison succeeds is the pixel passed through
-to the next stage in the rasterization process
-(see _cmnd(StencilOp)).
-All tests treat \f2stencil\fP values as unsigned integers in the range
-[0,$2 sup n - 1$],
-where $n$ is the number of bitplanes in the stencil buffer.
-.P
-The following values are accepted by _param1:
-.TP 18
-_const(NEVER)
-Always fails.
-.TP
-_const(LESS)
-Passes if ( _param2 & _param3 ) < ( \f2stencil\fP & _param3 ). 
-.TP
-_const(LEQUAL)
-Passes if ( _param2 & _param3 ) \(<= ( \f2stencil\fP & _param3 ).
-.TP
-_const(GREATER)
-Passes if ( _param2 & _param3 ) > ( \f2stencil\fP & _param3 ).
-.TP
-_const(GEQUAL)
-Passes if ( _param2 & _param3 ) \(>= ( \f2stencil\fP & _param3 ).
-.TP
-_const(EQUAL)
-Passes if ( _param2 & _param3 ) = ( \f2stencil\fP & _param3 ).
-.TP
-_const(NOTEQUAL)
-Passes if ( _param2 & _param3 ) \(!=  ( \f2stencil\fP & _param3 ).
-.TP
-_const(ALWAYS)
-Always passes.
-.SH NOTES
-Initially, the stencil test is disabled.
-If there is no stencil buffer,
-no stencil modification can occur and it is as if
-the stencil test always passes.
-.SH ERRORS
-_const(INVALID_ENUM) is generated if _param1 is not one of the eight
-accepted values.
-.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(STENCIL_FUNC)
-.br
-_cmnd(Get) with argument _const(STENCIL_VALUE_MASK)
-.br
-_cmnd(Get) with argument _const(STENCIL_REF)
-.br
-_cmnd(Get) with argument _const(STENCIL_BITS)
-.br
-_cmnd(IsEnabled) with argument _const(STENCIL_TEST)
-.SH SEE ALSO
-_cmnd(AlphaFunc),
-_cmnd(BlendFunc),
-_cmnd(DepthFunc),
-_cmnd(Enable),
-_cmnd(IsEnabled),
-_cmnd(LogicOp),
-_cmnd(StencilOp)