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GLUNURBSCALLBACK(3G)					  GLUNURBSCALLBACK(3G)

NAME
       gluNurbsCallback - define a callback for a NURBS object

C SPECIFICATION
       void gluNurbsCallback( GLUnurbs* nurb,
	    GLenum which,
	    _GLUfuncptr CallBackFunc )

       delim $$

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

       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
       gluNurbsCallback 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 gluNurbsCallbackData.

       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:
		 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
	      gluNurbsCallbackData.  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
	      gluNurbsCallbackData.  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.
	      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
	      gluNurbsCallbackData.  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
	      gluNurbsCallbackData.  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.  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
	      gluNurbsCallbackData.  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
	      gluNurbsCallbackData.  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 gluErrorString.

NOTES
       gluNurbsCallback 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
       gluErrorString(3G), gluNewNurbsRenderer(3G), gluNurbsCallbackData(3G),
       gluNurbsProperty(3G)

								 March 1, 2011
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