nooise 2.2.0

Ambient music generator for the terminal
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//! White noise plus its one-pole tone shaping, the source behind Perc and
//! Clap.

use rand::Rng;

pub(crate) struct WhiteNoise {
    last: f32,
}

impl WhiteNoise {
    pub(crate) fn new() -> Self {
        Self { last: 0.0 }
    }

    pub(crate) fn next<R: Rng>(&mut self, rng: &mut R) -> f32 {
        rng.gen_range(-1.0..1.0)
    }

    pub(crate) fn next_filtered<R: Rng>(&mut self, rng: &mut R, smoothing: f32) -> f32 {
        let white = self.next(rng);
        self.last += (white - self.last) * smoothing.clamp(0.0, 1.0);
        self.last
    }
}