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glGetMap.3gl
Langue: en
Version: 95690 (fedora - 25/11/07)
Section: 3 (Bibliothèques de fonctions)
NAME
glGetMapdv, glGetMapfv, glGetMapiv - return evaluator parametersC 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 )
delim $$
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 $uorder ~times~ vorder$ 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(3G), glMap1(3G), glMap2(3G)Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre