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GLGETMAP(3G)			 OpenGL Manual			  GLGETMAP(3G)

NAME
       glGetMap - 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
       parameters.  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 integer 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()

COPYRIGHT
       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
       under the SGI Free Software B License. For details, see
       http://oss.sgi.com/projects/FreeB/.

AUTHORS
       opengl.org

opengl.org			  03/16/2013			  GLGETMAP(3G)
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