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glGetMap

Chapter 7

200

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.

HP b2600 Reference Guide

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