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identity_matrix(3)              Allegro manual              identity_matrix(3)

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(3)