/* 
 * vector.h
 *
 * Vector math.
 *
 */

typedef struct {
    float x, y, z;
} vector;

#define UNPACK_VECTOR(v) v.x, v.y, v.z

vector make_vector(float x, float y, float z);

// Vector arithmetic.
vector vec_add(vector a, vector b);
vector vec_sub(vector a, vector b);

float vec_dot(vector a, vector b);
vector vec_cross(vector a, vector b);

vector vec_mult(vector a, float b);
vector vec_div(vector a, float b);

// Reverses the direction.
vector vec_neg(vector a);

// Magnitude.
float vec_mag(vector a);

// Scale vector so magnitude == 1.
vector normalize(vector a);

extern const vector zero_vector;