glGetMap man page on RedHat
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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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