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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 x 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 (C) 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				    06/10/2014				     GLGETMAP(3G)
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