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/*
* Copyright (C) 2018-2020 - Vito Caputo - <vcaputo@pengaru.com>
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 3 as published
* by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _V4F_H
#define _V4F_H
#include <math.h>
typedef struct v4f_t {
float x, y, z, w;
} v4f_t;
static inline v4f_t v4f_add(const v4f_t *a, const v4f_t *b)
{
return (v4f_t){a->x + b->x, a->y + b->y, a->z + b->z, a->w + b->w};
}
static inline v4f_t v4f_sub(const v4f_t *a, const v4f_t *b)
{
return (v4f_t){a->x - b->x, a->y - b->y, a->z - b->z, a->w - b->w};
}
static inline v4f_t v4f_mult(const v4f_t *a, const v4f_t *b)
{
return (v4f_t){a->x * b->x, a->y * b->y, a->z * b->z, a->w * b->w};
}
static inline v4f_t v4f_mult_scalar(const v4f_t *v, float scalar)
{
return (v4f_t){v->x * scalar, v->y * scalar, v->z * scalar, v->w * scalar};
}
static inline float v4f_dot(v4f_t *a, v4f_t *b)
{
return a->x * b->x + a->y * b->y + a->z * b->z + a->w * b->w;
}
static inline float v4f_length(v4f_t *v)
{
return sqrtf(v4f_dot(v, v));
}
static inline v4f_t v4f_normalize(v4f_t *v)
{
return v4f_mult_scalar(v, 1.0f / v4f_length(v));
}
static inline v4f_t v4f_lerp(const v4f_t *a, const v4f_t *b, float t)
{
v4f_t lerp_a, lerp_b;
lerp_a = v4f_mult_scalar(a, 1.0f - t);
lerp_b = v4f_mult_scalar(b, t);
return v4f_add(&lerp_a, &lerp_b);
}
static inline v4f_t v4f_nlerp(const v4f_t *a, const v4f_t *b, float t)
{
v4f_t lerp = v4f_lerp(a, b, t);
return v4f_normalize(&lerp);
}
#endif
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