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#include "vector.h"
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <stdio.h>
#include <assert.h>
static inline vector_t *vector_exists(vector_t *v)
{
assert(v);
return v;
}
// Overwrites stuff in p. If p is null a new vector is created
vector_t *vector_set(vector_t *p, COORD_T x, COORD_T y, COORD_T z)
{
p = vector_exists(p);
p->x = x;
p->y = y;
p->z = z;
return p;
}
// Can also be used to create a vector by leaving v NULL
vector_t *vector_copy(vector_t *dest, vector_t *src)
{
dest = vector_exists(dest);
// If v exist copy it over
if (src) {
memcpy(dest, src, sizeof(vector_t));
}
return dest;
}
COORD_T vector_len(vector_t *v)
{
return sqrt( v->x * v->x + v->y * v->y + v->z * v->z );
}
vector_t *vector_add(vector_t *dest, vector_t *a, vector_t *b)
{
dest = vector_exists(dest);
dest->x = a->x + b->x;
dest->y = a->y + b->y;
dest->z = a->z + b->z;
return dest;
}
vector_t *vector_sub(vector_t *dest, vector_t *a, vector_t *b)
{
dest = vector_exists(dest);
dest->x = a->x - b->x;
dest->y = a->y - b->y;
dest->z = a->z - b->z;
return dest;
}
vector_t *vector_mult(vector_t *dest, vector_t *a, vector_t *b)
{
dest = vector_exists(dest);
dest->x = a->x * b->x;
dest->y = a->y * b->y;
dest->z = a->z * b->z;
return dest;
}
vector_t *vector_scale(vector_t *dest, vector_t *a, COORD_T b)
{
dest = vector_exists(dest);
dest->x = a->x * b;
dest->y = a->y * b;
dest->z = a->z * b;
return dest;
}
vector_t *vector_scale_inv(vector_t *dest, vector_t *a, COORD_T b)
{
dest = vector_exists(dest);
dest->x = a->x / b;
dest->y = a->y / b;
dest->z = a->z / b;
return dest;
}
COORD_T vector_dot(vector_t *a, vector_t *b)
{
return a->x * b->x + a->y * b->y + a->z * b->z;
}
vector_t *vector_cross(vector_t *dest, vector_t *a, vector_t *b)
{
dest = vector_exists(dest);
dest->x = a->y * b->z - a->z * b->y;
dest->y = a->z * b->x - a->x * b->z;
dest->z = a->x * b->y - a->y * b->x;
return dest;
}
void vector_print(vector_t *v)
{
printf("[ %f, %f, %f ]\n", v->x, v->y, v->z);
}
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