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/*
* 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_x16 };
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;
unsigned n_centers = ctxt->setup->n_centers;
moire_center_t *centers = ctxt->centers;
float cx, cy;
/* TODO: optimize */
cy = yf * (float)fragment->y - 1.f;
for (int y = 0; y < fragment->height; y++, cy += yf) {
cx = xf * (float)fragment->x - 1.f;
for (int x = 0; x < fragment->width; x++, cx += xf) {
unsigned char filled = 0;
for (unsigned i = 0; i < n_centers; i++) {
float dx, dy;
dx = cx - centers[i].x;
dy = cy - centers[i].y;
filled ^= ((int)((sqrtf(dx * dx + dy * dy)) * 20.f) & 0x1);
}
if (filled)
til_fb_fragment_put_pixel_unchecked(fragment, TIL_FB_DRAW_FLAG_TEXTURABLE, fragment->x + x, fragment->y + y, 0xffffffff);
else if (!fragment->cleared)
til_fb_fragment_put_pixel_unchecked(fragment, 0, fragment->x + x, fragment->y + 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,
};
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