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|
#![feature(array_chunks)]
use cpal::{
BufferSize, SampleRate, StreamConfig,
traits::{DeviceTrait, HostTrait, StreamTrait},
};
use glam::{Vec2, vec2};
use sdl2::event::Event;
use std::{
collections::VecDeque,
env::args,
f32::consts::PI,
fs::read_to_string,
sync::mpsc::{Receiver, channel},
thread::sleep,
time::{Duration, Instant},
};
fn main() {
let start = Instant::now();
let mut points = VecDeque::new();
let (mouse_tx, mouse_rx) = channel();
let mut state = State::new(mouse_rx);
let mut frames = 0;
let mut last_stats = Instant::now();
let host = cpal::default_host();
let outdev = host.default_output_device().unwrap();
let outstream = outdev
.build_output_stream(
&StreamConfig {
buffer_size: BufferSize::Default,
channels: 2,
sample_rate: SampleRate(48_000),
},
move |data: &mut [f32], _| {
let time = start.elapsed().as_secs_f32();
while points.len() < data.len() / 2 {
state.draw(&mut points, time);
frames += 1;
}
if last_stats.elapsed().as_secs() >= 1 {
last_stats = Instant::now();
eprintln!("FPS = {frames}");
frames = 0;
}
for [x, y] in data.array_chunks_mut::<2>() {
let p = points.pop_front().unwrap();
*x = p.x;
*y = p.y;
}
},
|err| eprintln!("{err}"),
None,
)
.unwrap();
outstream.play().unwrap();
let sdl = sdl2::init().unwrap();
let video = sdl.video().unwrap();
let mut window = video
.window("Input capture", 256, 256)
.resizable()
.build()
.unwrap();
let mut events = sdl.event_pump().unwrap();
let mut last_draw = Instant::now();
'blub: loop {
for event in events.poll_iter() {
match event {
Event::Window { .. } => {}
Event::MouseButtonDown { .. } => {
window.set_mouse_grab(true);
mouse_tx.send(Vec2::NEG_INFINITY).unwrap();
}
Event::MouseMotion { xrel, yrel, .. } => {
mouse_tx.send(vec2(xrel as f32, -yrel as f32)).unwrap();
}
Event::Quit { .. } => break 'blub,
_ => (),
}
}
if last_draw.elapsed().as_secs_f32() > 0.1 {
last_draw = Instant::now();
let mut surf = window.surface(&events).unwrap();
surf.fill_rect(
sdl2::rect::Rect::new(0, 0, 100, 100),
sdl2::pixels::Color::RED,
)
.unwrap();
surf.finish().unwrap();
}
sleep(Duration::from_millis(1));
}
}
struct State {
mouse: Vec2,
mouse_rx: Receiver<Vec2>,
objects: Vec<HitObject>,
}
impl State {
pub fn new(mouse_rx: Receiver<Vec2>) -> Self {
let objects = parse_file(&read_to_string(&args().nth(1).unwrap()).unwrap());
Self {
mouse: Vec2::ZERO,
mouse_rx,
objects,
}
}
pub fn draw(&mut self, points: &mut VecDeque<Vec2>, time: f32) {
for x in self.mouse_rx.try_iter() {
if x.is_finite() {
self.mouse += x / 100.;
} else {
self.mouse *= 0.;
}
}
for i in 0..200 {
let t = i as f32 / 30. * PI * 2.;
points.push_back((Vec2::from_angle(t) * 2.).clamp(Vec2::NEG_ONE, Vec2::ONE));
}
for _ in 0..200 {
points.push_back(self.mouse);
}
render_frame(&self.objects, points, time);
}
}
fn render_frame(obs: &[HitObject], points: &mut VecDeque<Vec2>, time: f32) {
let mut render_any = false;
for h in obs {
let t = h.time as f32 / 1000.;
let trel = time - t;
if trel > 0. || trel < -1. {
continue;
}
render_any = true;
let center = vec2(h.x as f32 / 512., h.y as f32 / 384.) * 2. - 1.;
let base_r = 0.1;
let approach_r = base_r + trel / -5.;
draw_circle(points, center, base_r, 200);
draw_circle(points, center, approach_r, 200);
}
if !render_any {
points.extend((0..100).map(|_| Vec2::ZERO));
}
}
fn draw_circle(points: &mut VecDeque<Vec2>, center: Vec2, r: f32, res: usize) {
for i in 0..res {
let t = i as f32 / res as f32 * PI * 2.;
points.push_back(center + Vec2::from_angle(t) * r);
}
}
struct HitObject {
x: i32,
y: i32,
time: i32,
}
fn parse_file(s: &str) -> Vec<HitObject> {
let mut obs = Vec::new();
let b = s.split_once("[HitObjects]").unwrap().1;
for line in b.lines() {
if line.is_empty() {
continue;
}
let mut toks = line.split(",");
let x = toks.next().unwrap().parse().unwrap();
let y = toks.next().unwrap().parse().unwrap();
let time = toks.next().unwrap().parse().unwrap();
obs.push(HitObject { x, y, time })
}
obs
}
|
