caw_modules 0.5.0

Collection of synthesizer modules for the caw synthesizer framework
Documentation 
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use crate::low_level::freeverb;
use caw_builder_proc_macros::builder;
use caw_core::{Buf, Filter, SigCtx, SigT};
use itertools::izip;

builder! {
    #[constructor = "reverb_freeverb"]
    #[constructor_doc = "Reverb module with adjustable room size and damping"]
    #[generic_setter_type_name = "X"]
    pub struct Props {
        // controls reverb delay
        #[generic_with_constraint = "SigT<Item = f32>"]
        #[generic_name = "R"]
        #[default = freeverb::INITIAL_ROOM_SIZE as f32]
        room_size: f32,
        // removes high end of reverb to simulate a "softer room"
        #[generic_with_constraint = "SigT<Item = f32>"]
        #[generic_name = "D"]
        #[default = freeverb::INITIAL_DAMPING as f32]
        damping: f32,
        // 0 is dry signal, 1 is all reverb
        #[generic_with_constraint = "SigT<Item = f32>"]
        #[generic_name = "M"]
        #[default = 0.5]
        mix_01: f32,
    }
}

pub struct ReverbFreeverb<S, R, D, M>
where
    S: SigT<Item = f32>,
    R: SigT<Item = f32>,
    D: SigT<Item = f32>,
    M: SigT<Item = f32>,
{
    props: Props<R, D, M>,
    sig: S,
    state: freeverb::ReverbModel,
    room_size_prev: f32,
    damping_prev: f32,
    buf: Vec<f32>,
}

impl<R, D, M> Filter for Props<R, D, M>
where
    R: SigT<Item = f32>,
    D: SigT<Item = f32>,
    M: SigT<Item = f32>,
{
    type ItemIn = f32;

    type Out<S>
        = ReverbFreeverb<S, R, D, M>
    where
        S: SigT<Item = Self::ItemIn>;

    fn into_sig<S>(self, sig: S) -> Self::Out<S>
    where
        S: SigT<Item = Self::ItemIn>,
    {
        ReverbFreeverb {
            props: self,
            sig,
            state: freeverb::ReverbModel::new(),
            room_size_prev: freeverb::INITIAL_ROOM_SIZE as f32,
            damping_prev: freeverb::INITIAL_DAMPING as f32,
            buf: Vec::new(),
        }
    }
}

impl<S, R, D, M> SigT for ReverbFreeverb<S, R, D, M>
where
    S: SigT<Item = f32>,
    R: SigT<Item = f32>,
    D: SigT<Item = f32>,
    M: SigT<Item = f32>,
{
    type Item = f32;

    fn sample(&mut self, ctx: &SigCtx) -> impl Buf<Self::Item> {
        self.buf.resize(ctx.num_samples, 0.0);
        let sig = self.sig.sample(ctx);
        let room_size = self.props.room_size.sample(ctx);
        let damping = self.props.damping.sample(ctx);
        let mix_01 = self.props.mix_01.sample(ctx);
        for (out, sample, room_size, damping, mix_01) in izip! {
            self.buf.iter_mut(),
            sig.iter(),
            room_size.iter(),
            damping.iter(),
            mix_01.iter(),
        } {
            if room_size != self.room_size_prev {
                self.room_size_prev = room_size;
                self.state.set_room_size(room_size as f64);
            }
            if damping != self.damping_prev {
                self.damping_prev = damping;
                self.state.set_damping(damping as f64);
            }
            let reverb = self.state.process(sample as f64) as f32;
            *out = (reverb * mix_01) + (sample * (1.0 - mix_01));
        }
        &self.buf
    }
}