n_3d.h

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#ifndef _N_3D_HEADER
#define _N_3D_HEADER
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include "n_log.h"
#include "n_common.h"
#include <sys/time.h>
 
#define MOVE_STOPPED 0
#define MOVE_INTER 1
#define MOVE_SIMU 2
 
#define VECTOR3D_DONT_INTERSECT -2
#define VECTOR3D_COLLINEAR -1
#define VECTOR3D_DO_INTERSECT 0
 
typedef double VECTOR3D[3]; /* x , y , z  */
 
#define VECTOR3D_SET(VECTOR, X, Y, Z) \
    VECTOR[0] = (X);                  \
    VECTOR[1] = (Y);                  \
    VECTOR[2] = (Z);
 
typedef struct PHYSICS {
    time_t delta_t;
    VECTOR3D position;
    VECTOR3D speed;
    VECTOR3D acceleration;
    VECTOR3D orientation;
    VECTOR3D angular_speed;
    VECTOR3D angular_acceleration;
    VECTOR3D gravity;
    int can_jump;
    int sz;
    int type;
} PHYSICS;
 
/* distance between two points */
double distance(VECTOR3D* p1, VECTOR3D* p2);
/* update component[ it ] of a VECTOR3D */
int update_physics_position_nb(PHYSICS* object, int it, double delta_t);
/* update component[ it ] of a VECTOR3D, reversed time */
int update_physics_position_reverse_nb(PHYSICS* object, int it, double delta_t);
/* update the position of an object, using the delta time T to update positions */
int update_physics_position(PHYSICS* object, double delta_t);
/* update the position of an object, using the delta time T to reverse update positions */
int update_physics_position_reverse(PHYSICS* object, double delta_t);
/* compute if two vector are colliding, storing the resulting point in px */
int vector_intersect(VECTOR3D* p0, VECTOR3D* p1, VECTOR3D* p2, VECTOR3D* p3, VECTOR3D* px);
/* dot product */
double vector_dot_product(VECTOR3D* vec1, VECTOR3D* vec2);
/* vector normalize */
double vector_normalize(VECTOR3D* vec);
/* vector angle with other vector */
double vector_angle_between(VECTOR3D* vec1, VECTOR3D* vec2);
 
#define copy_point(__src_, __dst_) \
    memcpy(__dst_, __src_, sizeof(VECTOR3D));
 
#ifdef __cplusplus
}
#endif
 
#endif  // header guard