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
92
93
94
95
|
/*
* Copyright © 2018 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef __IGT_MATRIX_H__
#define __IGT_MATRIX_H__
/**
* igt_vec4:
* @d: vector elements
*
* A 4 element column vector (4x1 matrix).
*/
struct igt_vec4 {
float d[4];
};
/**
* igt_mat4:
* @d: matrix elements
*
* A 4x4 column major matrix.
*/
struct igt_mat4 {
float d[16];
};
#define m(row, col) ((col) * 4 + (row))
void igt_matrix_print(const struct igt_mat4 *m);
struct igt_mat4 igt_matrix_identity(void);
struct igt_mat4 igt_matrix_scale(float x, float y, float z);
struct igt_mat4 igt_matrix_translate(float x, float y, float z);
struct igt_mat4 igt_matrix_multiply(const struct igt_mat4 *a,
const struct igt_mat4 *b);
/**
* igt_matrix_transform:
*
* Transform the vector @v by the matrix @m. @m is on the left,
* @v on the right.
*
* Returns:
* The transformed vector.
*/
static inline struct igt_vec4
igt_matrix_transform(const struct igt_mat4 *m,
const struct igt_vec4 *v)
{
struct igt_vec4 ret = {
.d = { m->d[m(0, 0)] * v->d[0] +
m->d[m(0, 1)] * v->d[1] +
m->d[m(0, 2)] * v->d[2] +
m->d[m(0, 3)] * v->d[3],
m->d[m(1, 0)] * v->d[0] +
m->d[m(1, 1)] * v->d[1] +
m->d[m(1, 2)] * v->d[2] +
m->d[m(1, 3)] * v->d[3],
m->d[m(2, 0)] * v->d[0] +
m->d[m(2, 1)] * v->d[1] +
m->d[m(2, 2)] * v->d[2] +
m->d[m(2, 3)] * v->d[3],
m->d[m(3, 0)] * v->d[0] +
m->d[m(3, 1)] * v->d[1] +
m->d[m(3, 2)] * v->d[2] +
m->d[m(3, 3)] * v->d[3],
},
};
return ret;
}
#endif /* __IGT_MATRIX_H__ */
|
