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#include <math.h>
#include <stdio.h>
#include <string.h>
#include "til.h"
#include "til_fb.h"
/* Copyright (C) 2017-2022 Vito Caputo <vcaputo@pengaru.com> */
#define NUM_BLINDS 16
/* draw a blind over fragment */
static inline void draw_blind(til_fb_fragment_t *fragment, unsigned row, float t)
{
unsigned row_height = fragment->frame_height / NUM_BLINDS;
unsigned height = roundf(t * (float)row_height);
for (unsigned y = 0; y < height; y++)
memset(fragment->buf + ((row * row_height) + y ) * (fragment->pitch >> 2), 0xff, fragment->width * 4);
}
/* draw blinds over the fragment */
static void blinds_render_fragment(void *context, unsigned ticks, unsigned cpu, til_fb_fragment_t *fragment)
{
static float rr;
unsigned row;
float r;
til_fb_fragment_clear(fragment);
for (r = rr, row = 0; row < NUM_BLINDS; row++, r += .1)
draw_blind(fragment, row, 1.f - fabsf(cosf(r)));
rr += .01;
}
til_module_t blinds_module = {
.render_fragment = blinds_render_fragment,
.name = "blinds",
.description = "Retro 80s-inspired window blinds",
.author = "Vito Caputo <vcaputo@pengaru.com>",
};
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