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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(EvalCoord,evaluate enabled one- and two-dimensional maps)
-.EQ
-delim $$
-.EN
-_names(EvalCoord,[1-2][fd])
-.SH PARAMETERS
-_phead(_param1)
-Specifies a value that is the domain coordinate $u$ to the basis function
-defined in a previous _cmnd(Map1) or _cmnd(Map2) command.
-_phead(_param2)
-Specifies a value that is the domain coordinate $v$ to the basis function
-defined in a previous _cmnd(Map2) command.
-This argument is not present in a _cmnd(EvalCoord1) command.
-_names(EvalCoord,[1-2][fd]v)
-.SH PARAMETERS
-_phead(_param1)
-Specifies a pointer to an array containing
-either one or two domain coordinates.
-The first coordinate is $u$.
-The second coordinate is $v$,
-which is present only in _cmnd(EvalCoord2) versions.
-.SH DESCRIPTION
-_cmnd(EvalCoord1) evaluates enabled one-dimensional maps at argument
-_param1(1).
-_cmnd(EvalCoord2) does the same for two-dimensional maps using
-two domain values,
-_param1(1) and _param2(1).
-To define a map, call _cmnd(Map1) and _cmnd(Map2); to enable and
-disable it, call _cmnd(Enable) and _cmnd(Disable).
-.P
-When one of the _cmnd(EvalCoord) commands is issued,
-all currently enabled maps of the indicated dimension are evaluated.
-Then,
-for each enabled map,
-it is as if the corresponding GL command had been issued with the
-computed value.
-That is,
-if _const(MAP1_INDEX) or
-_const(MAP2_INDEX) is enabled,
-a _cmnd(Index) command is simulated.
-If _const(MAP1_COLOR_4) or
-_const(MAP2_COLOR_4) is enabled,
-a _cmnd(Color) command is simulated.
-If _const(MAP1_NORMAL) or _const(MAP2_NORMAL) is enabled,
-a normal vector is produced,
-and if any of
-_const(MAP1_TEXTURE_COORD_1),
-_const(MAP1_TEXTURE_COORD_2),
-_const(MAP1_TEXTURE_COORD_3),
-_const(MAP1_TEXTURE_COORD_4),
-_const(MAP2_TEXTURE_COORD_1),
-_const(MAP2_TEXTURE_COORD_2),
-_const(MAP2_TEXTURE_COORD_3), or
-_const(MAP2_TEXTURE_COORD_4) is enabled, then an appropriate _cmnd(TexCoord) command is simulated.
-.P
-For color,
-color index,
-normal,
-and texture coordinates the GL uses evaluated values instead of current values for those evaluations
-that are enabled,
-and current values otherwise,
-However,
-the evaluated values do not update the current values.
-Thus, if _cmnd(Vertex) commands are interspersed with _cmnd(EvalCoord)
-commands, the color,
-normal,
-and texture coordinates associated with the _cmnd(Vertex) commands are not
-affected by the values generated by the _cmnd(EvalCoord) commands,
-but only by the most recent
-_cmnd(Color),
-_cmnd(Index),
-_cmnd(Normal), and
-_cmnd(TexCoord) commands.
-.P
-No commands are issued for maps that are not enabled.
-If more than one texture evaluation is enabled for a particular dimension
-(for example, _const(MAP2_TEXTURE_COORD_1) and
-_const(MAP2_TEXTURE_COORD_2)),
-then only the evaluation of the map that produces the larger
-number of coordinates
-(in this case, _const(MAP2_TEXTURE_COORD_2))
-is carried out.
-_const(MAP1_VERTEX_4) overrides _const(MAP1_VERTEX_3),
-and
-_const(MAP2_VERTEX_4) overrides _const(MAP2_VERTEX_3),
-in the same manner.
-If neither a three- nor a four-component vertex map is enabled for the
-specified dimension,
-the _cmnd(EvalCoord) command is ignored.
-.P
-If you have enabled automatic normal generation,
-by calling _cmnd(Enable) with argument _const(AUTO_NORMAL),
-_cmnd(EvalCoord2) generates surface normals analytically,
-regardless of the contents or enabling of the _const(MAP2_NORMAL) map.
-Let
-.sp
-.ce
-.EQ
-bold m ~=~ {partial bold p} over {partial u} ~times~
- {partial bold p} over {partial v}
-.EN
-.ce 0
-.sp
-.br
-Then the generated normal $ bold n $ is
-.br
-.ce
-$bold n ~=~ bold m over { || bold m || }$
-.ce 0
-.sp
-.br
-If automatic normal generation is disabled,
-the corresponding normal map _const(MAP2_NORMAL),
-if enabled,
-is used to produce a normal.
-If neither automatic normal generation nor a normal map is enabled,
-no normal is generated for
-_cmnd(EvalCoord2) commands.
-.SH ASSOCIATED GETS
-.nf
-_cmnd(IsEnabled) with argument _const(MAP1_VERTEX_3)
-.br
-_cmnd(IsEnabled) with argument _const(MAP1_VERTEX_4)
-.br
-_cmnd(IsEnabled) with argument _const(MAP1_INDEX)
-.br
-_cmnd(IsEnabled) with argument _const(MAP1_COLOR_4)
-.br
-_cmnd(IsEnabled) with argument _const(MAP1_NORMAL)
-.br
-_cmnd(IsEnabled) with argument _const(MAP1_TEXTURE_COORD_1)
-.br
-_cmnd(IsEnabled) with argument _const(MAP1_TEXTURE_COORD_2)
-.br
-_cmnd(IsEnabled) with argument _const(MAP1_TEXTURE_COORD_3)
-.br
-_cmnd(IsEnabled) with argument _const(MAP1_TEXTURE_COORD_4)
-.br
-_cmnd(IsEnabled) with argument _const(MAP2_VERTEX_3)
-.br
-_cmnd(IsEnabled) with argument _const(MAP2_VERTEX_4)
-.br
-_cmnd(IsEnabled) with argument _const(MAP2_INDEX)
-.br
-_cmnd(IsEnabled) with argument _const(MAP2_COLOR_4)
-.br
-_cmnd(IsEnabled) with argument _const(MAP2_NORMAL)
-.br
-_cmnd(IsEnabled) with argument _const(MAP2_TEXTURE_COORD_1)
-.br
-_cmnd(IsEnabled) with argument _const(MAP2_TEXTURE_COORD_2)
-.br
-_cmnd(IsEnabled) with argument _const(MAP2_TEXTURE_COORD_3)
-.br
-_cmnd(IsEnabled) with argument _const(MAP2_TEXTURE_COORD_4)
-.br
-_cmnd(IsEnabled) with argument _const(AUTO_NORMAL)
-.br
-_cmnd(GetMap)
-.SH SEE ALSO
-_cmnd(Begin),
-_cmnd(Color),
-_cmnd(Enable),
-_cmnd(EvalMesh),
-_cmnd(EvalPoint),
-_cmnd(Index),
-_cmnd(Map1),
-_cmnd(Map2),
-_cmnd(MapGrid),
-_cmnd(Normal),
-_cmnd(TexCoord),
-_cmnd(Vertex)