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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_ $Date: 2004/03/14 08:29:09 $ $Revision: 1.1.1.4 $
-_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(NurbsCallback, define a callback for a NURBS object)
-_names(NurbsCallback)
-.EQ
-delim $$
-.EN
-.SH PARAMETERS
-_phead(_param1)
-Specifies the NURBS object (created with _cmnd(NewNurbsRenderer)).
-_phead(_param2)
-Specifies the callback being defined.
-Valid values are _gluconst(NURBS_BEGIN), _gluconst(NURBS_VERTEX), _gluconst(NURBS_NORMAL), _gluconst(NURBS_COLOR), _gluconst(NURBS_TEXTURE_COORD), _gluconst(NURBS_END), _gluconst(NURBS_BEGIN_DATA), _gluconst(NURBS_VERTEX_DATA), _gluconst(NURBS_NORMAL_DATA), _gluconst(NURBS_COLOR_DATA), _gluconst(NURBS_TEXTURE_COORD_DATA), _gluconst(NURBS_END_DATA), and _gluconst(NURBS_ERROR).
-_phead(_param3)
-Specifies the function that the callback calls.
-.SH DESCRIPTION
-_cmnd is used to define a callback to be used by a NURBS
-object.
-If the specified callback is already defined, then it is replaced. If
-_param3 is NULL, then this callback will not get
-invoked and the related data, if any, will be lost.
-.P
-Except the error callback, these callbacks are used by NURBS tessellator (when _gluconst(NURBS_MODE) is set to be _gluconst(NURBS_TESSELLATOR)) to return back the OpenGL
-polygon primitives resulting from the tessellation. Note that there are two
-versions of each callback: one with a user data pointer and one without. If both versions for a particular callback are specified then the callback with
-the user data pointer will be used. Note that ``userData'' is a copy of the pointer that was specified at the last call to _cmnd(NurbsCallbackData).
-.P
-The error callback function is effective no matter which value that
-_gluconst(NURBS_MODE) is set to.
-All other callback functions are effective only when _gluconst(NURBS_MODE)
-is set to _gluconst(NURBS_TESSELLATOR).
-.P
-The legal callbacks are as follows:
-.TP 10
-_gluconst(NURBS_BEGIN)
-The begin callback indicates the start of a primitive. The function
-takes a single argument of type GLenum, which can be one of
-_const(LINES), _const(LINE_STRIP), _const(TRIANGLE_FAN), _const(TRIANGLE_STRIP), _const(TRIANGLES), or _const(QUAD_STRIP). The
-default begin callback function is NULL. The function prototype
-for this callback looks like:
-.RS
-.Ex
-void begin ( GLenum type );
-.Ee
-.RE
-.TP
-_gluconst(NURBS_BEGIN_DATA)
-The same as the _gluconst(NURBS_BEGIN) callback except that it takes an
-additional pointer argument. This pointer is a copy of the pointer that
-was specified at the last call to _cmnd(NurbsCallbackData). The
-default callback function is NULL. The function prototype for this
-callback function looks like:
-.RS
-.Ex
-void beginData (GLenum type, void *userData);
-.Ee
-.RE
-.TP
-_gluconst(NURBS_VERTEX)
-The vertex callback indicates a vertex of the primitive. The
-coordinates of the vertex are stored in the parameter ``vertex''. All
-the generated vertices have dimension 3, that is, homogeneous
-coordinates have been transformed into affine coordinates. The default
-vertex callback function is NULL. The function prototype for this
-callback function looks like:
-.RS
-.Ex
-void vertex ( GLfloat *vertex );
-.Ee
-.RE
-.TP
-_gluconst(NURBS_VERTEX_DATA)
-This is the same as the _gluconst(NURBS_VERTEX) callback, except that
-it takes an additional pointer argument. This pointer is a copy of the
-pointer that was specified at the last call to
-_cmnd(NurbsCallbackData). The default callback function is NULL. The
-function prototype for this callback function looks like:
-.RS
-.Ex
-void vertexData ( GLfloat *vertex, void *userData );
-.Ee
-.RE
-.TP
-_gluconst(NURBS_NORMAL)
-The normal callback is invoked as the vertex normal is generated.
-The components of the normal are stored in the parameter ``normal''.
-In the case of a NURBS curve, the callback function is effective only when
-the user provides a normal map (_const(MAP1_NORMAL)).
-In the case of a NURBS surface, if a normal map (_const(MAP2_NORMAL)) is provided, then the generated normal is computed from the normal map.
-If a normal map is not provided then a surface normal is computed in
-a manner similar to that described for evaluators when _const(AUTO_NORMAL)
-is enabled.
-.bp
-The default normal callback function is NULL. The function
-prototype for this callback function looks like:
-.RS
-.Ex
-void normal ( GLfloat *normal );
-.Ee
-.RE
-.TP
-_gluconst(NURBS_NORMAL_DATA)
-The same as the _gluconst(NURBS_NORMAL) callback except that it
-takes an additional pointer argument. This pointer is a copy of the pointer
-that was specified at the last call to _cmnd(NurbsCallbackData). The default callback function is NULL. The function prototype for this callback function looks like:
-.RS
-.Ex
-void normalData ( GLfloat *normal, void *userData );
-.Ee
-.RE
-.TP
-_gluconst(NURBS_COLOR)
-The color callback is invoked as the color of a vertex is generated.
-The components of the color are stored in the parameter ``color''.
-This callback is effective only when the user provides a color map
-(_const(MAP1_COLOR_4) or _const(MAP2_COLOR_4)). ``color'' contains four components: R,G,B,A. The default color callback function is NULL. The prototype for
-this callback function looks like:
-.RS
-.Ex
-void color ( GLfloat *color );
-.Ee
-.RE
-.TP
-_gluconst(NURBS_COLOR_DATA)
-The same as the _gluconst(NURBS_COLOR) callback except that it
-takes an additional pointer argument. This pointer is a copy of the pointer
-that was specified at the last call to _cmnd(NurbsCallbackData). The default callback function is NULL. The function prototype for this callback function looks like:
-.RS
-.Ex
-void colorData ( GLfloat *color, void *userData );
-.Ee
-.RE
-.TP
-_gluconst(NURBS_TEXTURE_COORD)
-The texture callback is invoked as the texture coordinates
-of a vertex are generated. These coordinates are stored in the parameter
-``texCoord''. The number of texture coordinates can be 1, 2, 3, or 4 depending
-on which type of texture map is specified
-(_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),
-_const(MAP2_TEXTURE_COORD_4)).
-If no texture map is specified, this callback function will not be called.
-.bp
-The default texture callback function is NULL. The function prototype
-for this callback function looks like:
-.RS
-.Ex
-void texCoord ( GLfloat *texCoord );
-.Ee
-.RE
-.TP
- _gluconst(NURBS_TEXTURE_COORD_DATA)
-This is the same as the _gluconst(NURBS_TEXTURE_COORD) callback, except that it
-takes an additional pointer argument. This pointer is a copy of the pointer
-that was specified at the last call to _cmnd(NurbsCallbackData). The default callback function is NULL. The function prototype for this callback function looks like:
-.RS
-.Ex
-void texCoordData (GLfloat *texCoord, void *userData);
-.Ee
-.RE
-.TP
-_gluconst(NURBS_END)
-The end callback is invoked at the end of a primitive. The default end callback function is NULL. The function prototype for this callback function looks like:
-.RS
-.Ex
-void end ( void );
-.Ee
-.RE
-.TP
-_gluconst(NURBS_END_DATA)
-This is the same as the _gluconst(NURBS_END) callback, except that it
-takes an additional pointer argument. This pointer is a copy of the pointer
-that was specified at the last call to _cmnd(NurbsCallbackData). The default callback function is NULL. The function prototype for this callback function looks like:
-.RS
-.Ex
-void endData ( void *userData );
-.Ee
-.RE
-.TP
-_gluconst(NURBS_ERROR)
-The error function is called when an error is encountered.
-Its single argument
-is of type GLenum, and it indicates the specific error that occurred.
-There are 37 errors unique to NURBS named
-_gluconst(NURBS_ERROR1) through _gluconst(NURBS_ERROR37).
-Character strings describing these errors can be retrieved with
-_cmnd(ErrorString).
-.bp
-.SH NOTES
-_cmnd is available only if the GLU version is 1.2 or greater.
-.P
-GLU version 1.2 supports only the _gluconst(ERROR) parameter for
-_param2. The _gluconst(ERROR) value is deprecated in GLU version 1.3 in
-favor of _gluconst(NURBS_ERROR). All other accepted values for _param3
-are available only if the GLU version is 1.3 or greater.
-.SH SEE ALSO
-_cmnd(ErrorString),
-_cmnd(NewNurbsRenderer),
-_cmnd(NurbsCallbackData),
-_cmnd(NurbsProperty)
-