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use super::{ Osc, Envelope, Sample };
pub struct Instrument {
pub osc_bank: Vec<Osc>,
pub envelope: Envelope,
}
impl Instrument {
pub fn sample(&mut self) -> Sample {
match self.next() {
Some(s) => { s },
None => 0.0
}
}
}
impl Iterator for Instrument {
type Item = Sample;
fn next(&mut self) -> Option<Self::Item> {
let goo : f32 = self.osc_bank.iter_mut().map(|o| o.sample()).sum();
let scaled = goo / self.osc_bank.len() as f32;
match self.envelope.next() {
Some(a) => Some(scaled * a),
None => None
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_name() {
let sr = 44800.0;
let mut inst = Instrument {
osc_bank: vec![Osc::new(220.0, sr), Osc::new(440.0, sr), Osc::new(880.0, sr)],
envelope: Envelope::new(10, 200, 0.7, 1000, sr),
};
assert_eq!(inst.next(), Some(0.0));
}
}
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