1 /*
2 * Copyright © 2018 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 */
23
24 #ifndef __IGT_MATRIX_H__
25 #define __IGT_MATRIX_H__
26
27 /**
28 * igt_vec4:
29 * @d: vector elements
30 *
31 * A 4 element column vector (4x1 matrix).
32 */
33 struct igt_vec4 {
34 float d[4];
35 };
36
37 /**
38 * igt_mat4:
39 * @d: matrix elements
40 *
41 * A 4x4 column major matrix.
42 */
43 struct igt_mat4 {
44 float d[16];
45 };
46
47 #define m(row, col) ((col) * 4 + (row))
48
49 void igt_matrix_print(const struct igt_mat4 *m);
50 struct igt_mat4 igt_matrix_identity(void);
51 struct igt_mat4 igt_matrix_scale(float x, float y, float z);
52 struct igt_mat4 igt_matrix_translate(float x, float y, float z);
53 struct igt_mat4 igt_matrix_multiply(const struct igt_mat4 *a,
54 const struct igt_mat4 *b);
55
56 /**
57 * igt_matrix_transform:
58 * @m: The matrix
59 * @v: The vector
60 *
61 * Transform the vector @v by the matrix @m. @m is on the left,
62 * @v on the right.
63 *
64 * Returns:
65 * The transformed vector.
66 */
67 static inline struct igt_vec4
igt_matrix_transform(const struct igt_mat4 * m,const struct igt_vec4 * v)68 igt_matrix_transform(const struct igt_mat4 *m,
69 const struct igt_vec4 *v)
70 {
71 struct igt_vec4 ret = {
72 .d = { m->d[m(0, 0)] * v->d[0] +
73 m->d[m(0, 1)] * v->d[1] +
74 m->d[m(0, 2)] * v->d[2] +
75 m->d[m(0, 3)] * v->d[3],
76
77 m->d[m(1, 0)] * v->d[0] +
78 m->d[m(1, 1)] * v->d[1] +
79 m->d[m(1, 2)] * v->d[2] +
80 m->d[m(1, 3)] * v->d[3],
81
82 m->d[m(2, 0)] * v->d[0] +
83 m->d[m(2, 1)] * v->d[1] +
84 m->d[m(2, 2)] * v->d[2] +
85 m->d[m(2, 3)] * v->d[3],
86
87 m->d[m(3, 0)] * v->d[0] +
88 m->d[m(3, 1)] * v->d[1] +
89 m->d[m(3, 2)] * v->d[2] +
90 m->d[m(3, 3)] * v->d[3],
91 },
92 };
93
94 return ret;
95 }
96
97 #endif /* __IGT_MATRIX_H__ */
98