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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(Hint,specify implementation-specific hints)
+_names(Hint)
+.SH PARAMETERS
+_phead(_param1)
+Specifies a symbolic constant indicating the behavior to be controlled.
+_const(FOG_HINT),	
+_const(LINE_SMOOTH_HINT),
+_const(PERSPECTIVE_CORRECTION_HINT),
+_const(POINT_SMOOTH_HINT), and
+_const(POLYGON_SMOOTH_HINT) are accepted. 
+_phead(_param2)
+Specifies a symbolic constant indicating the desired behavior.
+_const(FASTEST), 
+_const(NICEST), and 
+_const(DONT_CARE) are accepted. 
+.SH DESCRIPTION
+Certain aspects of GL behavior,
+when there is room for interpretation,
+can be controlled with hints.
+A hint is specified with two arguments.
+_param1 is a symbolic 
+constant indicating the behavior to be controlled,
+and _param2 is another symbolic constant indicating the desired
+behavior. The initial value for each _param1 is _const(DONT_CARE). 
+_param2 can be one of the following:
+.TP 20
+_const(FASTEST)
+The most efficient option should be chosen.
+.TP
+_const(NICEST)
+The most correct,
+or highest quality,
+option should be chosen.
+.TP 
+_const(DONT_CARE)
+No preference.
+.P
+Though the implementation aspects that can be hinted are well defined,
+the interpretation of the hints depends on the implementation.
+The hint aspects that can be specified with _param1,
+along with suggested semantics,
+are as follows:
+.TP 20
+_const(FOG_HINT)
+Indicates the accuracy of fog calculation.
+If per-pixel fog calculation is not efficiently supported
+by the GL implementation,
+hinting _const(DONT_CARE) or _const(FASTEST) can result in per-vertex
+calculation of fog effects.
+.TP
+_const(LINE_SMOOTH_HINT)
+Indicates the sampling quality of antialiased lines.
+If a larger filter function is applied, hinting _const(NICEST) can
+result in more pixel fragments being generated during rasterization,
+.TP
+_const(PERSPECTIVE_CORRECTION_HINT)
+Indicates the quality of color and texture coordinate interpolation.
+If perspective-corrected parameter interpolation is not efficiently supported
+by the GL implementation,
+hinting _const(DONT_CARE) or _const(FASTEST) can result in simple linear
+interpolation of colors and/or texture coordinates.
+.TP
+_const(POINT_SMOOTH_HINT)
+Indicates the sampling quality of antialiased points.
+If a larger filter function is applied, hinting _const(NICEST) can
+result in more pixel fragments being generated during rasterization, 
+.TP
+_const(POLYGON_SMOOTH_HINT)
+Indicates the sampling quality of antialiased polygons.
+Hinting _const(NICEST) can result in more pixel fragments being generated
+during rasterization,
+if a larger filter function is applied.
+.SH NOTES
+The interpretation of hints depends on the implementation.
+Some implementations ignore _cmnd(Hint) settings.
+.SH ERRORS
+_const(INVALID_ENUM) is generated if either _param1 or _param2 is not
+an accepted value.
+.P
+_const(INVALID_OPERATION) is generated if _cmnd
+is executed between the execution of _cmnd(Begin)
+and the corresponding execution of _cmnd(End).