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fgluNurbsCallback(3G)	       OpenGL Reference		 fgluNurbsCallback(3G)

NAME
     fgluNurbsCallback - define a callback for a NURBS object

FORTRAN SPECIFICATION
     SUBROUTINE fgluNurbsCallback( CHARACTER*8 nurb,
				   INTEGER*4 which,
				   CHARACTER*8 (CallBackFunc)( )

PARAMETERS
     nurb	   Specifies the NURBS object (created with
		   fgluNewNurbsRenderer).

     which	   Specifies the callback being defined. Valid values are
		   GLU_NURBS_BEGIN, GLU_NURBS_VERTEX, GLU_NURBS_NORMAL,
		   GLU_NURBS_COLOR, GLU_NURBS_TEXTURE_COORD, GLU_NURBS_END,
		   GLU_NURBS_BEGIN_DATA, GLU_NURBS_VERTEX_DATA,
		   GLU_NURBS_NORMAL_DATA, GLU_NURBS_COLOR_DATA,
		   GLU_NURBS_TEXTURE_COORD_DATA, GLU_NURBS_END_DATA, and
		   GLU_NURBS_ERROR.

     CallBackFunc  Specifies the function that the callback calls.

DESCRIPTION
     fgluNurbsCallback 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 CallBackFunc is NULL, then this callback will not get
     invoked and the related data, if any, will be lost.

     Except the error callback, these callbacks are used by NURBS tessellator
     (when GLU_NURBS_MODE is set to be GLU_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 fgluNurbsCallbackData.

     The error callback function is effective no matter which value that
     GLU_NURBS_MODE is set to.	All other callback functions are effective
     only when GLU_NURBS_MODE is set to GLU_NURBS_TESSELLATOR.

     The legal callbacks are as follows:

     GLU_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 GL_LINES, GL_LINE_STRIP, GL_TRIANGLE_FAN,
	       GL_TRIANGLE_STRIP, GL_TRIANGLES, or GL_QUAD_STRIP. The default
	       begin callback function is NULL. The function prototype for
	       this callback looks like:

									Page 1

fgluNurbsCallback(3G)	       OpenGL Reference		 fgluNurbsCallback(3G)

		    void begin ( GLenum type );

     GLU_NURBS_BEGIN_DATA
	       The same as the GLU_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
	       fgluNurbsCallbackData.  The default callback function is NULL.
	       The function prototype for this callback function looks like:

		    void beginData (GLenum type, void *userData);

     GLU_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:

		    void vertex ( GLfloat *vertex );

     GLU_NURBS_VERTEX_DATA
	       This is the same as the GLU_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
	       fgluNurbsCallbackData.  The default callback function is NULL.
	       The function prototype for this callback function looks like:

		    void vertexData ( GLfloat *vertex, void *userData );

     GLU_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 (GL_MAP1_NORMAL).  In the case of a NURBS surface,
	       if a normal map (GL_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
	       GL_AUTO_NORMAL is enabled.

									Page 2

fgluNurbsCallback(3G)	       OpenGL Reference		 fgluNurbsCallback(3G)

	       The default normal callback function is NULL. The function
	       prototype for this callback function looks like:

		    void normal ( GLfloat *normal );

     GLU_NURBS_NORMAL_DATA
	       The same as the GLU_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
	       fgluNurbsCallbackData.  The default callback function is NULL.
	       The function prototype for this callback function looks like:

		    void normalData ( GLfloat *normal, void *userData );

     GLU_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 (GL_MAP1_COLOR_4 or GL_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:

		    void color ( GLfloat *color );

     GLU_NURBS_COLOR_DATA
	       The same as the GLU_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
	       fgluNurbsCallbackData.  The default callback function is NULL.
	       The function prototype for this callback function looks like:

		    void colorData ( GLfloat *color, void *userData );

     GLU_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 (GL_MAP1_TEXTURE_COORD_1, GL_MAP1_TEXTURE_COORD_2,
	       GL_MAP1_TEXTURE_COORD_3, GL_MAP1_TEXTURE_COORD_4,
	       GL_MAP2_TEXTURE_COORD_1, GL_MAP2_TEXTURE_COORD_2,
	       GL_MAP2_TEXTURE_COORD_3, GL_MAP2_TEXTURE_COORD_4).  If no
	       texture map is specified, this callback function will not be
	       called.

									Page 3

fgluNurbsCallback(3G)	       OpenGL Reference		 fgluNurbsCallback(3G)

	       The default texture callback function is NULL. The function
	       prototype for this callback function looks like:

		    void texCoord ( GLfloat *texCoord );

      GLU_NURBS_TEXTURE_COORD_DATA
	       This is the same as the GLU_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 fgluNurbsCallbackData.  The default callback function
	       is NULL. The function prototype for this callback function
	       looks like:

		    void texCoordData (GLfloat *texCoord, void *userData);

     GLU_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:

		    void end ( void );

     GLU_NURBS_END_DATA
	       This is the same as the GLU_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
	       fgluNurbsCallbackData.  The default callback function is NULL.
	       The function prototype for this callback function looks like:

		    void endData ( void	 *userData );

     GLU_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 GLU_NURBS_ERROR1 through GLU_NURBS_ERROR37.
	       Character strings describing these errors can be retrieved with
	       fgluErrorString.

									Page 4

fgluNurbsCallback(3G)	       OpenGL Reference		 fgluNurbsCallback(3G)

NOTES
     fgluNurbsCallback is available only if the GLU version is 1.2 or greater.

     GLU version 1.2 supports only the GLU_ERROR parameter for which. The
     GLU_ERROR value is deprecated in GLU version 1.3 in favor of
     GLU_NURBS_ERROR.  All other accepted values for CallBackFunc are
     available only if the GLU version is 1.3 or greater.

SEE ALSO
     fgluErrorString, fgluNewNurbsRenderer, fgluNurbsCallbackData,
     fgluNurbsProperty

									Page 5

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