glGetMap — return evaluator parameters
void glGetMapdv( | GLenum | target, |
GLenum | query, | |
GLdouble * | v) ; |
void glGetMapfv( | GLenum | target, |
GLenum | query, | |
GLfloat * | v) ; |
void glGetMapiv( | GLenum | target, |
GLenum | query, | |
GLint * | v) ; |
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.
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
GL_ORDER
v
returns the order of the evaluator function.
One-dimensional evaluators return a single value,
GL_DOMAIN
v
returns the linear
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.
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