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glLoadMatrix

Chapter 10

263

glLoadMatrix

glLoadMatrixd, glLoadMatrixf: replace the current matrix with the speciﬁed

matrix.

C Speciﬁcation

void glLoadMatrixd(

const GLdouble *m)

void glLoadMatrixf(

const GLfloa *m)

Parameters

m Speciﬁes a pointer to 16 consecutive values, which are used as the

elements of a 44 column-major matrix.

Description

glLoadMatrix replaces the current matrix with the one whose elements are speciﬁed by

m. The current matrix is the projection matrix, modelview matrix, or texture matrix,

depending on the current matrix mode (see glMatrixMode).

The current matrix, M, deﬁnes a transformation of coordinates. For instance, assume M

refers to the modelview matrix. If v = (v[0], v[1], v[2], v[3]) is the set of object coordinates

of a vertex, and m points to an array of 16 single- or double-precision ﬂoating-point

values m[0], m[1],... ,m[15], then the modelview transformation M(v) does the following:

m[0] m[4] m[8] m[12] v[0]

Mv= m[1] m[5] m[9] m[13] × v[1]

m[2] m[6] m[10] m[14] v[2]

m[3] m[7] m[11] m[15] v[3]

Where × denotes matrix multiplication.

Projection and texture transformations are similarly deﬁned.

Notes

While the elements of the matrix may be speciﬁed with single or double precision, the

GL implementation may store or operate on these values in less than single precision.

Errors

• GL_INVALID_OPERATION is generated if glLoadMatrix is executed between the

execution of glBegin and the corresponding execution of glEnd.

HP b2600 Reference Guide

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