1 /****************************************************************************
2 *
3 * The MIT License (MIT)
4 *
5 * Copyright 2012 - 2020 Vivante Corporation, Santa Clara, California.
6 * All Rights Reserved.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining
9 * a copy of this software and associated documentation files (the
10 * 'Software'), to deal in the Software without restriction, including
11 * without limitation the rights to use, copy, modify, merge, publish,
12 * distribute, sub license, and/or sell copies of the Software, and to
13 * permit persons to whom the Software is furnished to do so, subject
14 * to the following conditions:
15 *
16 * The above copyright notice and this permission notice (including the
17 * next paragraph) shall be included in all copies or substantial
18 * portions of the Software.
19 *
20 * THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
21 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
23 * IN NO EVENT SHALL VIVANTE AND/OR ITS SUPPLIERS BE LIABLE FOR ANY
24 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
25 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
26 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 *
28 *****************************************************************************/
29
30 #include <math.h>
31 #include <string.h>
32 #include "vg_lite.h"
33
34
vg_lite_identity(vg_lite_matrix_t * matrix)35 void vg_lite_identity(vg_lite_matrix_t * matrix)
36 {
37 /* Set identify matrix. */
38 matrix->m[0][0] = 1.0f;
39 matrix->m[0][1] = 0.0f;
40 matrix->m[0][2] = 0.0f;
41 matrix->m[1][0] = 0.0f;
42 matrix->m[1][1] = 1.0f;
43 matrix->m[1][2] = 0.0f;
44 matrix->m[2][0] = 0.0f;
45 matrix->m[2][1] = 0.0f;
46 matrix->m[2][2] = 1.0f;
47 }
48
multiply(vg_lite_matrix_t * matrix,vg_lite_matrix_t * mult)49 static void multiply(vg_lite_matrix_t * matrix, vg_lite_matrix_t * mult)
50 {
51 vg_lite_matrix_t temp;
52 int row, column;
53
54 /* Process all rows. */
55 for (row = 0; row < 3; row++) {
56 /* Process all columns. */
57 for (column = 0; column < 3; column++) {
58 /* Compute matrix entry. */
59 temp.m[row][column] = (matrix->m[row][0] * mult->m[0][column])
60 + (matrix->m[row][1] * mult->m[1][column])
61 + (matrix->m[row][2] * mult->m[2][column]);
62 }
63 }
64
65 /* Copy temporary matrix into result. */
66 memcpy(matrix, &temp, sizeof(temp));
67 }
68
vg_lite_translate(vg_lite_float_t x,vg_lite_float_t y,vg_lite_matrix_t * matrix)69 void vg_lite_translate(vg_lite_float_t x, vg_lite_float_t y, vg_lite_matrix_t * matrix)
70 {
71 /* Set translation matrix. */
72 vg_lite_matrix_t t = { { {1.0f, 0.0f, x},
73 {0.0f, 1.0f, y},
74 {0.0f, 0.0f, 1.0f}
75 } };
76
77 /* Multiply with current matrix. */
78 multiply(matrix, &t);
79 }
80
vg_lite_scale(vg_lite_float_t scale_x,vg_lite_float_t scale_y,vg_lite_matrix_t * matrix)81 void vg_lite_scale(vg_lite_float_t scale_x, vg_lite_float_t scale_y, vg_lite_matrix_t * matrix)
82 {
83 /* Set scale matrix. */
84 vg_lite_matrix_t s = { { {scale_x, 0.0f, 0.0f},
85 {0.0f, scale_y, 0.0f},
86 {0.0f, 0.0f, 1.0f}
87 } };
88
89 /* Multiply with current matrix. */
90 multiply(matrix, &s);
91 }
92
vg_lite_rotate(vg_lite_float_t degrees,vg_lite_matrix_t * matrix)93 void vg_lite_rotate(vg_lite_float_t degrees, vg_lite_matrix_t * matrix)
94 {
95 #ifndef M_PI
96 #define M_PI 3.1415926f
97 #endif
98 /* Convert degrees into radians. */
99 vg_lite_float_t angle = degrees / 180.0f * M_PI;
100
101 /* Compuet cosine and sine values. */
102 vg_lite_float_t cos_angle = cosf(angle);
103 vg_lite_float_t sin_angle = sinf(angle);
104
105 /* Set rotation matrix. */
106 vg_lite_matrix_t r = { { {cos_angle, -sin_angle, 0.0f},
107 {sin_angle, cos_angle, 0.0f},
108 {0.0f, 0.0f, 1.0f}
109 } };
110
111 /* Multiply with current matrix. */
112 multiply(matrix, &r);
113 }
114