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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"
/* Copyright (C) 2017-2022 Vito Caputo <vcaputo@pengaru.com> */
#define BLINDS_DEFAULT_COUNT 16
#define BLINDS_DEFAULT_ORIENTATION BLINDS_ORIENTATION_HORIZONTAL
typedef enum blinds_orientation_t {
BLINDS_ORIENTATION_HORIZONTAL,
BLINDS_ORIENTATION_VERTICAL,
} blinds_orientation_t;
typedef struct blinds_setup_t {
til_setup_t til_setup;
unsigned count;
blinds_orientation_t orientation;
} blinds_setup_t;
typedef struct blinds_context_t {
til_module_context_t til_module_context;
struct {
til_tap_t t, step, count;
} taps;
struct {
float t, step, count;
} vars;
float *t, *step, *count;
blinds_setup_t *setup;
} blinds_context_t;
static til_module_context_t * blinds_create_context(const til_module_t *module, til_stream_t *stream, unsigned seed, unsigned ticks, unsigned n_cpus, til_setup_t *setup)
{
blinds_context_t *ctxt;
ctxt = til_module_context_new(module, sizeof(blinds_context_t), stream, seed, ticks, n_cpus, setup);
if (!ctxt)
return NULL;
ctxt->taps.t = til_tap_init_float(ctxt, &ctxt->t, 1, &ctxt->vars.t, "T");
ctxt->taps.step = til_tap_init_float(ctxt, &ctxt->step, 1, &ctxt->vars.step, "step");
ctxt->taps.count = til_tap_init_float(ctxt, &ctxt->count, 1, &ctxt->vars.count, "count");
ctxt->setup = (blinds_setup_t *)setup;
return &ctxt->til_module_context;
}
/* draw a horizontal blind over fragment */
static inline void draw_blind_horizontal(til_fb_fragment_t *fragment, unsigned row, unsigned count, float t)
{
unsigned row_height = fragment->frame_height / count;
unsigned height = roundf(t * (float)row_height);
/* XXX FIXME: use faster block style fill/copy if til_fb gets that */
for (unsigned y = 0; y < height; y++) {
for (unsigned x = 0; x < fragment->width; x++)
til_fb_fragment_put_pixel_checked(fragment, TIL_FB_DRAW_FLAG_TEXTURABLE, fragment->x + x, fragment->y + y + row * row_height, 0xffffffff); /* FIXME: use _unchecked() variant, but must not assume frame_height == height */
}
}
/* draw a vertical blind over fragment */
static inline void draw_blind_vertical(til_fb_fragment_t *fragment, unsigned column, unsigned count, float t)
{
unsigned column_width = fragment->frame_width / count;
unsigned width = roundf(t * (float)column_width);
/* XXX FIXME: use faster block style fill/copy if til_fb gets that */
for (unsigned y = 0; y < fragment->height; y++) {
for (unsigned x = 0; x < width; x++)
til_fb_fragment_put_pixel_checked(fragment, TIL_FB_DRAW_FLAG_TEXTURABLE, fragment->x + x + column * column_width, fragment->y + y, 0xffffffff); /* FIXME: use _unchecked() variant, but must not assume frame_width == width */
}
}
/* draw blinds over the fragment */
static void blinds_render_fragment(til_module_context_t *context, til_stream_t *stream, unsigned ticks, unsigned cpu, til_fb_fragment_t **fragment_ptr)
{
blinds_context_t *ctxt = (blinds_context_t *)context;
til_fb_fragment_t *fragment = *fragment_ptr;
unsigned blind;
float t;
if (!til_stream_tap_context(stream, context, NULL, &ctxt->taps.t))
*ctxt->t = til_ticks_to_rads(ticks);
if (!til_stream_tap_context(stream, context, NULL, &ctxt->taps.step))
*ctxt->step = .1f;
if (!til_stream_tap_context(stream, context, NULL, &ctxt->taps.count))
*ctxt->count = ctxt->setup->count;
til_fb_fragment_clear(fragment);
for (t = *ctxt->t, blind = 0; blind < (unsigned)*ctxt->count; blind++, t += *ctxt->step) {
switch (ctxt->setup->orientation) {
case BLINDS_ORIENTATION_HORIZONTAL:
draw_blind_horizontal(fragment, blind, ctxt->setup->count, 1.f - fabsf(cosf(t)));
break;
case BLINDS_ORIENTATION_VERTICAL:
draw_blind_vertical(fragment, blind, ctxt->setup->count, 1.f - fabsf(cosf(t)));
break;
}
}
}
static int blinds_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 *orientation;
const char *count;
const char *orientation_values[] = {
"horizontal",
"vertical",
NULL
};
const char *count_values[] = {
"2",
"4",
"8",
"12",
"16",
"24",
"32",
NULL
};
int r;
r = til_settings_get_and_describe_value(settings,
&(til_setting_spec_t){
.name = "Blinds orientation",
.key = "orientation",
.regex = "^(horizontal|vertical)",
.preferred = orientation_values[BLINDS_DEFAULT_ORIENTATION],
.values = orientation_values,
.annotations = NULL
},
&orientation,
res_setting,
res_desc);
if (r)
return r;
r = til_settings_get_and_describe_value(settings,
&(til_setting_spec_t){
.name = "Blinds count",
.key = "count",
.regex = "\\.[0-9]+",
.preferred = TIL_SETTINGS_STR(BLINDS_DEFAULT_COUNT),
.values = count_values,
.annotations = NULL
},
&count,
res_setting,
res_desc);
if (r)
return r;
if (res_setup) {
blinds_setup_t *setup;
setup = til_setup_new(settings, sizeof(*setup), NULL);
if (!setup)
return -ENOMEM;
sscanf(count, "%u", &setup->count);
if (!strcasecmp(orientation, "horizontal")) {
setup->orientation = BLINDS_ORIENTATION_HORIZONTAL;
} else if (!strcasecmp(orientation, "vertical")) {
setup->orientation = BLINDS_ORIENTATION_VERTICAL;
} else {
til_setup_free(&setup->til_setup);
return -EINVAL;
}
*res_setup = &setup->til_setup;
}
return 0;
}
til_module_t blinds_module = {
.create_context = blinds_create_context,
.render_fragment = blinds_render_fragment,
.setup = blinds_setup,
.name = "blinds",
.description = "Retro 80s-inspired window blinds",
.author = "Vito Caputo <vcaputo@pengaru.com>",
.flags = TIL_MODULE_OVERLAYABLE,
};
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