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
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/*
* Copyright (C) 2022 - 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 2 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/>.
*/
#include <errno.h>
#include <math.h>
#include <stdlib.h>
#include <unistd.h>
#include "til.h"
#include "til_fb.h"
#include "til_module_context.h"
#define MOIRE_DEFAULT_CENTERS 2
typedef struct moire_setup_t {
til_setup_t til_setup;
unsigned n_centers;
} moire_setup_t;
typedef struct moire_center_t {
float x, y;
float seed;
float dir;
} moire_center_t;
typedef struct moire_context_t {
til_module_context_t til_module_context;
moire_setup_t *setup;
moire_center_t centers[];
} moire_context_t;
static til_module_context_t * moire_create_context(const til_module_t *module, til_stream_t *stream, unsigned seed, unsigned ticks, unsigned n_cpus, til_setup_t *setup)
{
moire_context_t *ctxt;
ctxt = til_module_context_new(module, sizeof(moire_context_t) + ((moire_setup_t *)setup)->n_centers * sizeof(moire_center_t), stream, seed, ticks, n_cpus, setup);
if (!ctxt)
return NULL;
ctxt->setup = (moire_setup_t *)setup;
for (unsigned i = 0; i < ((moire_setup_t *)setup)->n_centers; i++) {
ctxt->centers[i].seed = rand_r(&seed) * (1.f / (float)RAND_MAX) * 2 * M_PI;
ctxt->centers[i].dir = (rand_r(&seed) * (2.f / (float)RAND_MAX) - 1.f);
ctxt->centers[i].x = cosf(ctxt->centers[i].seed + (float)ticks * .001f * ctxt->centers[i].dir);
ctxt->centers[i].y = sinf(ctxt->centers[i].seed + (float)ticks * .001f * ctxt->centers[i].dir);
}
return &ctxt->til_module_context;
}
static void moire_prepare_frame(til_module_context_t *context, til_stream_t *stream, unsigned ticks, til_fb_fragment_t **fragment_ptr, til_frame_plan_t *res_frame_plan)
{
moire_context_t *ctxt = (moire_context_t *)context;
*res_frame_plan = (til_frame_plan_t){ .fragmenter = til_fragmenter_slice_per_cpu };
for (unsigned i = 0; i < ctxt->setup->n_centers; i++) {
ctxt->centers[i].x = cosf(ctxt->centers[i].seed + (float)ticks * .001f * ctxt->centers[i].dir);
ctxt->centers[i].y = sinf(ctxt->centers[i].seed + (float)ticks * .001f * ctxt->centers[i].dir);
}
}
static void moire_render_fragment(til_module_context_t *context, til_stream_t *stream, unsigned ticks, unsigned cpu, til_fb_fragment_t **fragment_ptr)
{
moire_context_t *ctxt = (moire_context_t *)context;
til_fb_fragment_t *fragment = *fragment_ptr;
float xf = 2.f / (float)fragment->frame_width;
float yf = 2.f / (float)fragment->frame_height;
float cx, cy;
/* TODO: optimize */
cy = yf * (float)fragment->y - 1.f;
for (int y = fragment->y; y < fragment->y + fragment->height; y++, cy += yf) {
cx = xf * (float)fragment->x - 1.f;
for (int x = fragment->x; x < fragment->x + fragment->width; x++, cx += xf) {
int filled = 0;
for (unsigned i = 0; i < ctxt->setup->n_centers; i++) {
float dx, dy;
dx = cx - ctxt->centers[i].x;
dy = cy - ctxt->centers[i].y;
if (cosf(sqrtf(dx * dx + dy * dy) * 50.f) < 0.f)
filled ^= 1;
}
if (filled)
til_fb_fragment_put_pixel_unchecked(fragment, TIL_FB_DRAW_FLAG_TEXTURABLE, x, y, 0xffffffff);
else if (!fragment->cleared)
til_fb_fragment_put_pixel_unchecked(fragment, 0, x, y, 0x00000000);
}
}
}
static int moire_setup(const til_settings_t *settings, til_setting_t **res_setting, const til_setting_desc_t **res_desc, til_setup_t **res_setup)
{
const char *centers;
const char *values[] = {
"2",
"3",
"4",
"5",
NULL
};
int r;
r = til_settings_get_and_describe_value(settings,
&(til_setting_spec_t){
.name = "Number of radial centers",
.key = "centers",
.regex = "\\.[0-9]+",
.preferred = TIL_SETTINGS_STR(MOIRE_DEFAULT_CENTERS),
.values = values,
.annotations = NULL
},
¢ers,
res_setting,
res_desc);
if (r)
return r;
if (res_setup) {
moire_setup_t *setup;
setup = til_setup_new(settings, sizeof(*setup), NULL);
if (!setup)
return -ENOMEM;
sscanf(centers, "%u", &setup->n_centers);
*res_setup = &setup->til_setup;
}
return 0;
}
til_module_t moire_module = {
.create_context = moire_create_context,
.prepare_frame = moire_prepare_frame,
.render_fragment = moire_render_fragment,
.setup = moire_setup,
.name = "moire",
.description = "2D Moire interference patterns (threaded)",
.author = "Vito Caputo <vcaputo@pengaru.com>",
.flags = TIL_MODULE_OVERLAYABLE,
};
|
