1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
/*
* Copyright (C) 2018-2019 - 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 _V2F_H
#define _V2F_H
#include <math.h>
typedef struct v2f_t {
float x, y;
} v2f_t;
static inline v2f_t v2f_add(const v2f_t *a, const v2f_t *b)
{
return (v2f_t){a->x + b->x, a->y + b->y};
}
static inline v2f_t v2f_sub(const v2f_t *a, const v2f_t *b)
{
return (v2f_t){a->x - b->x, a->y - b->y};
}
static inline v2f_t v2f_mult_scalar(const v2f_t *v, float scalar)
{
return (v2f_t){ v->x * scalar, v->y * scalar };
}
static inline v2f_t v2f_div_scalar(const v2f_t *v, float scalar)
{
return v2f_mult_scalar(v, 1.f / scalar);
}
static inline float v2f_dot(v2f_t *a, v2f_t *b)
{
return a->x * b->x + a->y * b->y;
}
static inline float v2f_length(v2f_t *v)
{
return sqrtf(v2f_dot(v, v));
}
static inline v2f_t v2f_normalize(v2f_t *v)
{
float f;
f = 1.0f / v2f_length(v);
return (v2f_t){ .x = f * v->x, .y = f * v->y };
}
static inline v2f_t v2f_lerp(const v2f_t *a, const v2f_t *b, float t)
{
v2f_t lerp_a, lerp_b;
lerp_a = v2f_mult_scalar(a, 1.0f - t);
lerp_b = v2f_mult_scalar(b, t);
return v2f_add(&lerp_a, &lerp_b);
}
static inline v2f_t v2f_nlerp(const v2f_t *a, const v2f_t *b, float t)
{
v2f_t lerp = v2f_lerp(a, b, t);
return v2f_normalize(&lerp);
}
#endif
|
