toaruos/apps/snow.c

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/**
* @brief Draw pretty falling snowflakes.
*
* @copyright
2018-12-01 11:13:04 +03:00
* This file is part of ToaruOS and is released under the terms
* of the NCSA / University of Illinois License - see LICENSE.md
* Copyright (C) 2018 K. Lange
*/
#include <stdlib.h>
#include <assert.h>
#include <unistd.h>
#include <time.h>
#include <sched.h>
#include <math.h>
#include <sys/fswait.h>
#include <sys/time.h>
#include <toaru/yutani.h>
#include <toaru/graphics.h>
static yutani_t * yctx;
static yutani_window_t * wina;
static gfx_context_t * ctx;
static int should_exit = 0;
static sprite_t snowflake;
#define FLAKES 40
#define FALL_SPEED 3
struct {
int16_t x;
int16_t y;
uint8_t rotation;
uint8_t alpha;
int8_t wind;
uint8_t exists;
} flakes[FLAKES];
int flakes_made = 0;
static void add_flake() {
for (int i = 0; i < FLAKES; ++i) {
if (!flakes[i].exists) {
flakes[i].exists = 1;
flakes[i].y = -snowflake.height / 2;
flakes[i].x = rand() % (ctx->width);
flakes[i].alpha = rand() % 50 + 50;
flakes[i].rotation = rand() % 255;
flakes[i].wind = (rand() % 6) - 3;
return;
}
}
}
static void draw(void) {
draw_fill(ctx, 0);
for (int i = 0; i < FLAKES; ++i) {
if (flakes[i].exists) {
draw_sprite_rotate(ctx, &snowflake,
flakes[i].x, flakes[i].y,
(float)(flakes[i].rotation) / 100.0,
(float)(flakes[i].alpha) / 100.0);
flakes[i].y += FALL_SPEED;
flakes[i].x += flakes[i].wind;
if (flakes[i].y >= ctx->height + snowflake.height / 2 ||
flakes[i].x <= -snowflake.width / 2 ||
flakes[i].x >= ctx->width + snowflake.width / 2) {
flakes[i].exists = 0;
add_flake();
}
}
}
flip(ctx);
yutani_flip(yctx, wina);
}
void resize_finish(int w, int h) {
yutani_window_resize_accept(yctx, wina, w, h);
reinit_graphics_yutani(ctx, wina);
draw();
yutani_window_resize_done(yctx, wina);
}
uint64_t last_flake = 0;
static uint64_t precise_current_time(void) {
struct timeval t;
gettimeofday(&t, NULL);
time_t sec_diff = t.tv_sec;
suseconds_t usec_diff = t.tv_usec;
return (uint64_t)(sec_diff * 1000 + usec_diff / 1000);
}
static uint64_t precise_time_since(uint64_t start_time) {
uint32_t now = precise_current_time();
uint32_t diff = now - start_time; /* Milliseconds */
return diff;
}
int main (int argc, char ** argv) {
srand(time(NULL));
memset(&flakes, 0, sizeof(flakes));
yctx = yutani_init();
if (!yctx) {
fprintf(stderr, "%s: failed to connect to compositor\n", argv[0]);
return 1;
}
load_sprite(&snowflake, "/usr/share/snowflake.bmp");
wina = yutani_window_create(yctx, 100, 100);
if (argc < 2 || strcmp(argv[1],"--no-ad")) {
yutani_window_advertise(yctx, wina, "snow");
}
yutani_special_request(yctx, wina, YUTANI_SPECIAL_REQUEST_MAXIMIZE);
yutani_window_update_shape(yctx, wina, 256);
ctx = init_graphics_yutani_double_buffer(wina);
draw_fill(ctx, rgba(0,0,0,0));
flip(ctx);
while (!should_exit) {
int fds[1] = {fileno(yctx->sock)};
int index = fswait2(1,fds,10);
if (index == 0) {
yutani_msg_t * m = yutani_poll(yctx);
while (m) {
switch (m->type) {
case YUTANI_MSG_KEY_EVENT:
{
struct yutani_msg_key_event * ke = (void*)m->data;
if (ke->event.action == KEY_ACTION_DOWN && ke->event.keycode == 'q') {
should_exit = 1;
sched_yield();
}
}
break;
case YUTANI_MSG_WINDOW_MOUSE_EVENT:
{
struct yutani_msg_window_mouse_event * me = (void*)m->data;
if (me->command == YUTANI_MOUSE_EVENT_DOWN && me->buttons & YUTANI_MOUSE_BUTTON_LEFT) {
yutani_window_drag_start(yctx, wina);
}
}
break;
case YUTANI_MSG_RESIZE_OFFER:
{
struct yutani_msg_window_resize * wr = (void*)m->data;
resize_finish(wr->width, wr->height);
}
break;
case YUTANI_MSG_WINDOW_CLOSE:
case YUTANI_MSG_SESSION_END:
should_exit = 1;
break;
default:
break;
}
free(m);
m = yutani_poll_async(yctx);
}
} else {
if (flakes_made < 20 && precise_time_since(last_flake) > 1000) {
add_flake();
flakes_made += 1;
last_flake = precise_current_time();
}
}
draw();
}
yutani_close(yctx, wina);
return 0;
}