glGetMap man page on Darwin

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GLGETMAP(3G)							  GLGETMAP(3G)

NAME
       glGetMapdv, glGetMapfv, glGetMapiv - return evaluator parameters

C SPECIFICATION
       void glGetMapdv( GLenum target,
			GLenum query,
			GLdouble *v )
       void glGetMapfv( GLenum target,
			GLenum query,
			GLfloat *v )
       void glGetMapiv( GLenum target,
			GLenum query,
			GLint *v )

PARAMETERS
       target  Specifies  the  symbolic	 name  of  a map.  Accepted values are
	       GL_MAP1_COLOR_4,		GL_MAP1_INDEX,	       GL_MAP1_NORMAL,
	       GL_MAP1_TEXTURE_COORD_1,		      GL_MAP1_TEXTURE_COORD_2,
	       GL_MAP1_TEXTURE_COORD_3,		      GL_MAP1_TEXTURE_COORD_4,
	       GL_MAP1_VERTEX_3,       GL_MAP1_VERTEX_4,      GL_MAP2_COLOR_4,
	       GL_MAP2_INDEX,	  GL_MAP2_NORMAL,     GL_MAP2_TEXTURE_COORD_1,
	       GL_MAP2_TEXTURE_COORD_2,		      GL_MAP2_TEXTURE_COORD_3,
	       GL_MAP2_TEXTURE_COORD_4,		GL_MAP2_VERTEX_3,	   and
	       GL_MAP2_VERTEX_4.

       query   Specifies  which parameter to return.  Symbolic names GL_COEFF,
	       GL_ORDER, and GL_DOMAIN are accepted.

       v       Returns the requested data.

DESCRIPTION
       glMap1 and glMap2 define evaluators.  glGetMap returns evaluator param‐
       eters.  target chooses a map, query selects a specific parameter, and v
       points to storage where the values will be returned.

       The acceptable values for the target parameter  are  described  in  the
       glMap1 and glMap2 reference pages.

       query can assume the following values:

       GL_COEFF	      v returns the control points for the evaluator function.
		      One-dimensional evaluators return order control  points,
		      and  two-dimensional  evaluators	return uorder * vorder
		      control points.  Each control  point  consists  of  one,
		      two,  three, or four integer, single-precision floating-
		      point,  or   double-precision   floating-point   values,
		      depending	 on the type of the evaluator.	The GL returns
		      two-dimensional  control	points	in  row-major	order,
		      incrementing  the	 uorder	 index	quickly and the vorder
		      index after each row.  Integer values,  when  requested,
		      are  computed  by	 rounding  the internal floating-point
		      values to the nearest integer values.

       GL_ORDER	      v returns the order of  the  evaluator  function.	  One-
		      dimensional evaluators return a single value, order. The
		      initial value is 1.  Two-dimensional  evaluators	return
		      two values, uorder and vorder. The initial value is 1,1.

       GL_DOMAIN      v	 returns  the linear u and v mapping parameters.  One-
		      dimensional evaluators return two values, u1 and u2,  as
		      specified	 by glMap1.  Two-dimensional evaluators return
		      four values (u1, u2, v1, and v2) as specified by glMap2.
		      Integer values, when requested, are computed by rounding
		      the internal floating-point values to the nearest	 inte‐
		      ger values.

NOTES
       If an error is generated, no change is made to the contents of v.

ERRORS
       GL_INVALID_ENUM	is  generated  if  either  target  or  query is not an
       accepted value.

       GL_INVALID_OPERATION is generated if glGetMap is executed  between  the
       execution of glBegin and the corresponding execution of glEnd.

SEE ALSO
       glEvalCoord, glMap1, glMap2

								  GLGETMAP(3G)
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