debian man page for identity_matrix

identity_matrix(3alleg4)					  Allegro manual					  identity_matrix(3alleg4)

NAME
       identity_matrix, identity_matrix_f - Global containing the identity matrix. Allegro game programming library.

SYNOPSIS
       #include <allegro.h>

       extern MATRIX identity_matrix;

       extern MATRIX_f identity_matrix_f;

DESCRIPTION
       Global variables containing the 'do nothing' identity matrix. Multiplying by the identity matrix has no effect.

Allegro 							   version 4.4.2					  identity_matrix(3alleg4)