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#include <errno.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "til.h"
#include "til_fb.h"
#include "til_module_context.h"
#include "til_stream.h"
#include "til_tap.h"
/* Dead-simple strobe light, initially made to try simulate this contraption:
* https://en.wikipedia.org/wiki/Dreamachine
*
* But it might actually have some general utility in compositing.
*/
/* Copyright (C) 2022 Vito Caputo <vcaputo@pengaru.com> */
/* TODO:
* - Make hz setting more flexible
*/
#define STROBE_DEFAULT_HZ 10
typedef struct strobe_setup_t {
til_setup_t til_setup;
float hz;
} strobe_setup_t;
typedef struct strobe_context_t {
til_module_context_t til_module_context;
strobe_setup_t *setup;
unsigned last_flash_ticks;
struct {
til_tap_t hz;
til_tap_t toggle;
} taps;
struct {
float hz;
float toggle;
} vars;
float *hz;
float *toggle;
unsigned flash:1;
unsigned flash_ready:1;
} strobe_context_t;
static void strobe_update_taps(strobe_context_t *ctxt, til_stream_t *stream, float dt)
{
if (!til_stream_tap_context(stream, &ctxt->til_module_context, NULL, &ctxt->taps.hz))
*ctxt->hz = ctxt->setup->hz;
else
ctxt->vars.hz = *ctxt->hz;
if (!til_stream_tap_context(stream, &ctxt->til_module_context, NULL, &ctxt->taps.toggle))
ctxt->vars.toggle = NAN;
else
ctxt->vars.toggle = *ctxt->toggle;
if (ctxt->vars.hz <= 0.f)
ctxt->vars.hz = 0.f;
}
static til_module_context_t * strobe_create_context(const til_module_t *module, til_stream_t *stream, unsigned seed, unsigned ticks, unsigned n_cpus, til_setup_t *setup)
{
strobe_context_t *ctxt;
ctxt = til_module_context_new(module, sizeof(strobe_context_t), stream, seed, ticks, n_cpus, setup);
if (!ctxt)
return NULL;
ctxt->setup = (strobe_setup_t *)setup;
ctxt->last_flash_ticks = ticks;
ctxt->taps.hz = til_tap_init_float(ctxt, &ctxt->hz, 1, &ctxt->vars.hz, "hz");
ctxt->taps.toggle = til_tap_init_float(ctxt, &ctxt->toggle, 1, &ctxt->vars.toggle, "toggle");
strobe_update_taps(ctxt, stream, 0.f);
return &ctxt->til_module_context;
}
static void strobe_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)
{
strobe_context_t *ctxt = (strobe_context_t *)context;
*res_frame_plan = (til_frame_plan_t){ .fragmenter = til_fragmenter_slice_per_cpu_x16 };
strobe_update_taps(ctxt, stream, (ticks - context->last_ticks) * .001f);
if (!isnan(ctxt->vars.toggle)) {
ctxt->flash = rintf(ctxt->vars.toggle) >= 1 ? 1 : 0;
ctxt->flash_ready = !ctxt->flash; /* kind of pointless */
return;
}
if (ctxt->vars.hz <= 0.f) {
ctxt->flash = 0;
ctxt->flash_ready = 1;
return;
}
if (ctxt->flash_ready && (ticks - ctxt->last_flash_ticks >= (unsigned)((1.f / ctxt->vars.hz) * 1000.f))){
ctxt->flash = 1;
ctxt->flash_ready = 0;
} else {
ctxt->flash_ready = 1;
}
}
static void strobe_render_fragment(til_module_context_t *context, til_stream_t *stream, unsigned ticks, unsigned cpu, til_fb_fragment_t **fragment_ptr)
{
strobe_context_t *ctxt = (strobe_context_t *)context;
til_fb_fragment_t *fragment = *fragment_ptr;
if (!ctxt->flash)
return til_fb_fragment_clear(fragment);
til_fb_fragment_fill(fragment, TIL_FB_DRAW_FLAG_TEXTURABLE, 0xffffffff);
}
static void strobe_finish_frame(til_module_context_t *context, til_stream_t *stream, unsigned int ticks, til_fb_fragment_t **fragment_ptr)
{
strobe_context_t *ctxt = (strobe_context_t *)context;
if (!ctxt->flash)
return;
ctxt->flash = 0;
ctxt->last_flash_ticks = ticks;
}
static int strobe_setup(const til_settings_t *settings, til_setting_t **res_setting, const til_setting_desc_t **res_desc, til_setup_t **res_setup);
til_module_t strobe_module = {
.create_context = strobe_create_context,
.prepare_frame = strobe_prepare_frame,
.render_fragment = strobe_render_fragment,
.finish_frame = strobe_finish_frame,
.setup = strobe_setup,
.name = "strobe",
.description = "Strobe light (threaded)",
.author = "Vito Caputo <vcaputo@pengaru.com>",
.flags = TIL_MODULE_OVERLAYABLE,
};
static int strobe_setup(const til_settings_t *settings, til_setting_t **res_setting, const til_setting_desc_t **res_desc, til_setup_t **res_setup)
{
til_setting_t *hz;
const char *hz_values[] = {
"60",
"50",
"40",
"20",
"10",
"4",
"2",
"1",
NULL
};
int r;
r = til_settings_get_and_describe_setting(settings,
&(til_setting_spec_t){
.name = "Strobe frequency in hz",
.key = "hz",
.regex = "\\.[0-9]+",
.preferred = TIL_SETTINGS_STR(STROBE_DEFAULT_HZ),
.values = hz_values,
.annotations = NULL
},
&hz,
res_setting,
res_desc);
if (r)
return r;
if (res_setup) {
strobe_setup_t *setup;
setup = til_setup_new(settings, sizeof(*setup), NULL, &strobe_module);
if (!setup)
return -ENOMEM;
if (sscanf(hz->value, "%f", &setup->hz) != 1)
return til_setup_free_with_failed_setting_ret_err(&setup->til_setup, hz, res_setting, -EINVAL);
*res_setup = &setup->til_setup;
}
return 0;
}
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