/usr/include/allegro/quat.h is in liballegro4-dev 2:4.4.2-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* /\ _ \ /\_ \ /\_ \
* \ \ \L\ \\//\ \ \//\ \ __ __ _ __ ___
* \ \ __ \ \ \ \ \ \ \ /'__`\ /'_ `\/\`'__\/ __`\
* \ \ \/\ \ \_\ \_ \_\ \_/\ __//\ \L\ \ \ \//\ \L\ \
* \ \_\ \_\/\____\/\____\ \____\ \____ \ \_\\ \____/
* \/_/\/_/\/____/\/____/\/____/\/___L\ \/_/ \/___/
* /\____/
* \_/__/
*
* Quaternion routines.
*
* By Shawn Hargreaves.
*
* See readme.txt for copyright information.
*/
#ifndef ALLEGRO_QUAT_H
#define ALLEGRO_QUAT_H
#include "base.h"
#ifdef __cplusplus
extern "C" {
#endif
typedef struct QUAT
{
float w, x, y, z;
} QUAT;
AL_VAR(QUAT, identity_quat);
AL_FUNC(void, quat_mul, (AL_CONST QUAT *p, AL_CONST QUAT *q, QUAT *out));
AL_FUNC(void, get_x_rotate_quat, (QUAT *q, float r));
AL_FUNC(void, get_y_rotate_quat, (QUAT *q, float r));
AL_FUNC(void, get_z_rotate_quat, (QUAT *q, float r));
AL_FUNC(void, get_rotation_quat, (QUAT *q, float x, float y, float z));
AL_FUNC(void, get_vector_rotation_quat, (QUAT *q, float x, float y, float z, float a));
AL_FUNC(void, apply_quat, (AL_CONST QUAT *q, float x, float y, float z, float *xout, float *yout, float *zout));
AL_FUNC(void, quat_slerp, (AL_CONST QUAT *from, AL_CONST QUAT *to, float t, QUAT *out, int how));
#define QUAT_SHORT 0
#define QUAT_LONG 1
#define QUAT_CW 2
#define QUAT_CCW 3
#define QUAT_USER 4
#define quat_interpolate(from, to, t, out) quat_slerp((from), (to), (t), (out), QUAT_SHORT)
#ifdef __cplusplus
}
#endif
#endif /* ifndef ALLEGRO_QUAT_H */
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