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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 <stdlib.h>
#include <unistd.h>
#include "til.h"
#include "til_fb.h"
#define CHECKERS_DEFAULT_SIZE 32
#define CHECKERS_DEFAULT_PATTERN CHECKERS_PATTERN_CHECKERED
#define CHECKERS_DEFAULT_DYNAMICS CHECKERS_DYNAMICS_ODD
#define CHECKERS_DEFAULT_DYNAMICS_RATE 1.0
typedef enum checkers_pattern_t {
CHECKERS_PATTERN_CHECKERED,
CHECKERS_PATTERN_RANDOM,
} checkers_pattern_t;
typedef enum checkers_dynamics_t {
CHECKERS_DYNAMICS_ODD,
CHECKERS_DYNAMICS_EVEN,
CHECKERS_DYNAMICS_ALTERNATING,
CHECKERS_DYNAMICS_RANDOM,
} checkers_dynamics_t;
typedef struct checkers_setup_t {
til_setup_t til_setup;
unsigned size;
checkers_pattern_t pattern;
checkers_dynamics_t dynamics;
float rate;
} checkers_setup_t;
typedef struct checkers_context_t {
checkers_setup_t setup;
} checkers_context_t;
static checkers_setup_t checkers_default_setup = {
.size = CHECKERS_DEFAULT_SIZE,
.pattern = CHECKERS_DEFAULT_PATTERN,
.dynamics = CHECKERS_DEFAULT_DYNAMICS,
.rate = CHECKERS_DEFAULT_DYNAMICS_RATE,
};
static void * checkers_create_context(unsigned ticks, unsigned num_cpus, til_setup_t *setup)
{
checkers_context_t *ctxt;
if (!setup)
setup = &checkers_default_setup.til_setup;
ctxt = calloc(1, sizeof(checkers_context_t));
if (!ctxt)
return NULL;
ctxt->setup = *(checkers_setup_t *)setup;
return ctxt;
}
static void checkers_destroy_context(void *context)
{
free(context);
}
static int checkers_fragmenter(void *context, unsigned n_cpus, const til_fb_fragment_t *fragment, unsigned number, til_fb_fragment_t *res_fragment)
{
checkers_context_t *ctxt = context;
return til_fb_fragment_tile_single(fragment, ctxt->setup.size, number, res_fragment);
}
static void checkers_prepare_frame(void *context, unsigned ticks, unsigned n_cpus, til_fb_fragment_t *fragment, til_fragmenter_t *res_fragmenter)
{
*res_fragmenter = checkers_fragmenter;
}
static inline unsigned hash(unsigned x)
{
x = ((x >> 16) ^ x) * 0x61C88647;
x = ((x >> 16) ^ x) * 0x61C88647;
x = ((x >> 16) ^ x) * 0x61C88647;
x = (x >> 16) ^ x;
return x;
}
static void checkers_render_fragment(void *context, unsigned ticks, unsigned cpu, til_fb_fragment_t *fragment)
{
checkers_context_t *ctxt = context;
int state;
switch (ctxt->setup.pattern) {
case CHECKERS_PATTERN_CHECKERED: {
unsigned tiles_per_row;
tiles_per_row = fragment->frame_width / ctxt->setup.size;
if (tiles_per_row * ctxt->setup.size < fragment->frame_width)
tiles_per_row++;
state = (fragment->number + (fragment->y / ctxt->setup.size) * !(tiles_per_row & 0x1)) & 0x1;
break;
}
case CHECKERS_PATTERN_RANDOM:
state = hash(fragment->number * 0x61C88647) & 0x1;
break;
}
switch (ctxt->setup.dynamics) {
case CHECKERS_DYNAMICS_ODD:
break;
case CHECKERS_DYNAMICS_EVEN:
state = ~state & 0x1;
break;
case CHECKERS_DYNAMICS_ALTERNATING:
state ^= ((unsigned)((float)ticks * ctxt->setup.rate) & 0x1);
break;
case CHECKERS_DYNAMICS_RANDOM: /* note: the big multiply here is just to get up out of the low bits */
state &= hash(fragment->number * 0x61C88647 + (unsigned)((float)ticks * ctxt->setup.rate)) & 0x1;
break;
}
if (!state)
til_fb_fragment_clear(fragment);
else
til_fb_fragment_fill(fragment, 0xffffffff);
}
static int checkers_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 *size;
const char *pattern;
const char *dynamics;
const char *dynamics_rate;
const char *size_values[] = {
"4",
"8",
"16",
"32",
"64",
"128",
NULL
};
const char *pattern_values[] = {
"checkered",
"random",
NULL
};
const char *dynamics_values[] = {
"odd",
"even",
"alternating",
"random",
NULL
};
const char *dynamics_rate_values[] = {
"1.0",
".75",
".5",
".25",
".1",
".01",
".001",
".0001",
NULL
};
int r;
r = til_settings_get_and_describe_value(settings,
&(til_setting_desc_t){
.name = "Checker size",
.key = "size",
.regex = "\\.[0-9]+",
.preferred = TIL_SETTINGS_STR(CHECKERS_DEFAULT_SIZE),
.values = size_values,
.annotations = NULL
},
&size,
res_setting,
res_desc);
if (r)
return r;
r = til_settings_get_and_describe_value(settings,
&(til_setting_desc_t){
.name = "Checkers pattern",
.key = "pattern",
.preferred = pattern_values[0],
.values = pattern_values,
.annotations = NULL
},
&pattern,
res_setting,
res_desc);
if (r)
return r;
r = til_settings_get_and_describe_value(settings,
&(til_setting_desc_t){
.name = "Checkers dynamics",
.key = "dynamics",
.preferred = dynamics_values[0],
.values = dynamics_values,
.annotations = NULL
},
&dynamics,
res_setting,
res_desc);
if (r)
return r;
if (strcasecmp(dynamics, "odd") && strcasecmp(dynamics, "even")) {
r = til_settings_get_and_describe_value(settings,
&(til_setting_desc_t){
.name = "Checkers dynamics rate",
.key = "dynamics_rate",
.preferred = dynamics_rate_values[0],
.values = dynamics_rate_values,
.annotations = NULL
},
&dynamics_rate,
res_setting,
res_desc);
if (r)
return r;
}
if (res_setup) {
checkers_setup_t *setup;
setup = til_setup_new(sizeof(*setup), (void(*)(til_setup_t *))free);
if (!setup)
return -ENOMEM;
sscanf(size, "%u", &setup->size);
if (!strcmp(pattern, "checkered"))
setup->pattern = CHECKERS_PATTERN_CHECKERED;
else if (!strcmp(pattern, "random"))
setup->pattern = CHECKERS_PATTERN_RANDOM;
else {
free(setup);
return -EINVAL;
}
if (!strcmp(dynamics, "odd"))
setup->dynamics = CHECKERS_DYNAMICS_ODD;
else if (!strcmp(dynamics, "even"))
setup->dynamics = CHECKERS_DYNAMICS_EVEN;
else if (!strcmp(dynamics, "alternating"))
setup->dynamics = CHECKERS_DYNAMICS_ALTERNATING;
else if (!strcmp(dynamics, "random"))
setup->dynamics = CHECKERS_DYNAMICS_RANDOM;
else {
free(setup);
return -EINVAL;
}
if (setup->dynamics != CHECKERS_DYNAMICS_ODD && setup->dynamics != CHECKERS_DYNAMICS_EVEN)
sscanf(dynamics_rate, "%f", &setup->rate);
*res_setup = &setup->til_setup;
}
return 0;
}
til_module_t checkers_module = {
.create_context = checkers_create_context,
.destroy_context = checkers_destroy_context,
.prepare_frame = checkers_prepare_frame,
.render_fragment = checkers_render_fragment,
.setup = checkers_setup,
.name = "checkers",
.description = "Checker-patterned overlay (threaded)",
.author = "Vito Caputo <vcaputo@pengaru.com>",
.flags = TIL_MODULE_OVERLAYABLE,
};
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