GLGETMAP - Online Linux Manual PageSection : 3G
NAME"glGetMapdv, glGetMapfv, glGetMapiv − return evaluator parameters
C SPECIFICATIONvoid glGetMapdv( GLenum target, GLenum query, GLdouble *v )void glGetMapfv( GLenum target, GLenum query, GLfloat *v )void glGetMapiv( GLenum target, GLenum query, GLint *v )
PARAMETERStarget  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.
DESCRIPTION­glMap1 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.
NOTESIf an error is generated, no change is made to the contents of v.
ERRORS­GL_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 ALSO­glEvalCoord(3G), ­glMap1(3G), ­glMap2(3G) 0
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