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 #include "igt_core.h"
25 #include "igt_matrix.h"
26
27 /**
28 * SECTION:igt_matrix
29 * @short_description: Matrix math library
30 * @title: Matrix
31 * @include: igt.h
32 *
33 * This library contains helper functions for basic matrix math.
34 * The library operates on #igt_mat4 and #igt_vec4 structures.
35 */
36
37 /**
38 * igt_matrix_print:
39 * @m: the matrix
40 *
41 * Print out the matrix elements.
42 */
igt_matrix_print(const struct igt_mat4 * m)43 void igt_matrix_print(const struct igt_mat4 *m)
44 {
45 for (int row = 0; row < 4; row++) {
46 igt_info("|");
47 for (int col = 0; col < 4; col++) {
48 igt_info("%4.4f,", m->d[m(row, col)]);
49 }
50 igt_info("|\n");
51 }
52 }
53
54 /**
55 * igt_matrix_identity:
56 *
57 * Returns:
58 * An identity matrix.
59 */
igt_matrix_identity(void)60 struct igt_mat4 igt_matrix_identity(void)
61 {
62 static const struct igt_mat4 ret = {
63 .d[m(0, 0)] = 1.0f,
64 .d[m(1, 1)] = 1.0f,
65 .d[m(2, 2)] = 1.0f,
66 .d[m(3, 3)] = 1.0f,
67 };
68
69 return ret;
70 }
71
72 /**
73 * igt_matrix_scale:
74 * @x: x scaling amount
75 * @y: y scaling amount
76 * @z: z scaling amount
77 *
78 * Returns:
79 * An scaling matrix.
80 */
igt_matrix_scale(float x,float y,float z)81 struct igt_mat4 igt_matrix_scale(float x, float y, float z)
82 {
83 struct igt_mat4 ret = {
84 .d[m(0, 0)] = x,
85 .d[m(1, 1)] = y,
86 .d[m(2, 2)] = z,
87 .d[m(3, 3)] = 1.0f,
88 };
89
90 return ret;
91 }
92
93 /**
94 * igt_matrix_translate:
95 * @x: x translation amount
96 * @y: y translation amount
97 * @z: z translation amount
98 *
99 * Returns:
100 * A translation matrix.
101 */
igt_matrix_translate(float x,float y,float z)102 struct igt_mat4 igt_matrix_translate(float x, float y, float z)
103 {
104 struct igt_mat4 ret = {
105 .d[m(0, 0)] = 1.0f,
106 .d[m(1, 1)] = 1.0f,
107 .d[m(2, 2)] = 1.0f,
108 .d[m(0, 3)] = x,
109 .d[m(1, 3)] = y,
110 .d[m(2, 3)] = z,
111 .d[m(3, 3)] = 1.0f,
112 };
113
114 return ret;
115 }
116
117 /**
118 * igt_matrix_multiply:
119 * @a: Left matrix
120 * @b: Right matrix
121 *
122 * Multiply two matrices together. @a is on the left,
123 * @b on the right.
124 *
125 * Returns:
126 * The resulting matrix.
127 */
igt_matrix_multiply(const struct igt_mat4 * a,const struct igt_mat4 * b)128 struct igt_mat4 igt_matrix_multiply(const struct igt_mat4 *a,
129 const struct igt_mat4 *b)
130 {
131 struct igt_mat4 ret = {};
132
133 for (int col = 0; col < 4; col++) {
134 for (int row = 0; row < 4; row++) {
135 for (int i = 0; i < 4; i++)
136 ret.d[m(row, col)] += a->d[m(row, i)] * b->d[m(i, col)];
137 }
138 }
139
140 return ret;
141 }
142