glevalcoord1fv man page on Solaris

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GLEVALCOORD(3gl)					      GLEVALCOORD(3gl)

NAME
       glEvalCoord1d,  glEvalCoord1f,  glEvalCoord2d, glEvalCoord2f, glEvalCo‐
       ord1dv,	glEvalCoord1fv,	 glEvalCoord2dv,  glEvalCoord2fv  -   evaluate
       enabled one- and two-dimensional maps

C SPECIFICATION
       void glEvalCoord1d( GLdouble u )
       void glEvalCoord1f( GLfloat u )
       void glEvalCoord2d( GLdouble u,
			   GLdouble v )
       void glEvalCoord2f( GLfloat u,
			   GLfloat v )

PARAMETERS
       u  Specifies a value that is the domain coordinate u to the basis func‐
	  tion defined in a previous glMap1 or glMap2 command.

       v  Specifies a value that is the domain coordinate v to the basis func‐
	  tion	defined	 in  a	previous glMap2 command.  This argument is not
	  present in a glEvalCoord1 command.

C SPECIFICATION
       void glEvalCoord1dv( const GLdouble *u )
       void glEvalCoord1fv( const GLfloat *u )
       void glEvalCoord2dv( const GLdouble *u )
       void glEvalCoord2fv( const GLfloat *u )

PARAMETERS
       u      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 glEvalCoord2 versions.

DESCRIPTION
       glEvalCoord1 evaluates enabled  one-dimensional	maps  at  argument  u.
       glEvalCoord2  does  the	same for two-dimensional maps using two domain
       values, u and v.	 To define a map, call glMap1 and  glMap2;  to	enable
       and disable it, call glEnable and glDisable.

       When  one  of the glEvalCoord 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 GL_MAP1_INDEX or GL_MAP2_INDEX is enabled,
       a  glIndex command is simulated.	 If GL_MAP1_COLOR_4 or GL_MAP2_COLOR_4
       is enabled, a glColor  command  is  simulated.	If  GL_MAP1_NORMAL  or
       GL_MAP2_NORMAL  is  enabled, a normal vector is produced, and if any of
       GL_MAP1_TEXTURE_COORD_1,	    GL_MAP1_TEXTURE_COORD_2,	  GL_MAP1_TEX‐
       TURE_COORD_3,	 GL_MAP1_TEXTURE_COORD_4,     GL_MAP2_TEXTURE_COORD_1,
       GL_MAP2_TEXTURE_COORD_2,	  GL_MAP2_TEXTURE_COORD_3,   or	  GL_MAP2_TEX‐
       TURE_COORD_4 is enabled, then an appropriate glTexCoord command is sim‐
       ulated.

       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  val‐
       ues  do	not update the current values.	Thus, if glVertex commands are
       interspersed with glEvalCoord commands, the color, normal, and  texture
       coordinates  associated	with the glVertex commands are not affected by
       the values generated by the glEvalCoord commands, but only by the  most
       recent glColor, glIndex, glNormal, and glTexCoord commands.

       No commands are issued for maps that are not enabled.  If more than one
       texture evaluation is enabled for a particular dimension (for  example,
       GL_MAP2_TEXTURE_COORD_1	and  GL_MAP2_TEXTURE_COORD_2),	then  only the
       evaluation of the map that produces the larger  number  of  coordinates
       (in  this  case, GL_MAP2_TEXTURE_COORD_2) is carried out.  GL_MAP1_VER‐
       TEX_4  overrides	 GL_MAP1_VERTEX_3,  and	  GL_MAP2_VERTEX_4   overrides
       GL_MAP2_VERTEX_3,  in the same manner.  If neither a three- nor a four-
       component vertex map is enabled for the specified dimension,  the  glE‐
       valCoord command is ignored.

       If  you	have  enabled automatic normal generation, by calling glEnable
       with argument GL_AUTO_NORMAL, glEvalCoord2  generates  surface  normals
       analytically,   regardless   of	 the   contents	 or  enabling  of  the
       GL_MAP2_NORMAL map.  Let

	   Pp	Pp
       m = -- X --
	   Pu	Pv

       Then the generated normal n is
	   _
       n=_____

       If automatic normal generation is disabled,  the	 corresponding	normal
       map  GL_MAP2_NORMAL,  if enabled, is used to produce a normal.  If nei‐
       ther automatic normal generation nor a normal map is enabled, no normal
       is generated for glEvalCoord2 commands.

ASSOCIATED GETS
       glIsEnabled with argument GL_MAP1_VERTEX_3
       glIsEnabled with argument GL_MAP1_VERTEX_4
       glIsEnabled with argument GL_MAP1_INDEX
       glIsEnabled with argument GL_MAP1_COLOR_4
       glIsEnabled with argument GL_MAP1_NORMAL
       glIsEnabled with argument GL_MAP1_TEXTURE_COORD_1
       glIsEnabled with argument GL_MAP1_TEXTURE_COORD_2
       glIsEnabled with argument GL_MAP1_TEXTURE_COORD_3
       glIsEnabled with argument GL_MAP1_TEXTURE_COORD_4
       glIsEnabled with argument GL_MAP2_VERTEX_3
       glIsEnabled with argument GL_MAP2_VERTEX_4
       glIsEnabled with argument GL_MAP2_INDEX
       glIsEnabled with argument GL_MAP2_COLOR_4
       glIsEnabled with argument GL_MAP2_NORMAL
       glIsEnabled with argument GL_MAP2_TEXTURE_COORD_1
       glIsEnabled with argument GL_MAP2_TEXTURE_COORD_2
       glIsEnabled with argument GL_MAP2_TEXTURE_COORD_3
       glIsEnabled with argument GL_MAP2_TEXTURE_COORD_4
       glIsEnabled with argument GL_AUTO_NORMAL
       glGetMap

SEE ALSO
       glBegin,	 glColor,  glEnable, glEvalMesh, glEvalPoint, glIndex, glMap1,
       glMap2, glMapGrid, glNormal, glTexCoord, glVertex

				   15 Mar 97		      GLEVALCOORD(3gl)
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