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|
use super::{
mem, FactoryParameters, GenBox, GenFactoryError, Generator, GeneratorFactory, Parameters, Rate,
SampleBuffer,
};
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Phase {
Delay,
Attack,
Hold,
Decay,
Sustain,
Release,
}
#[derive(Debug)]
pub struct DAHDSR {
pub delay: GenBox,
pub attack: GenBox,
pub hold: GenBox,
pub decay: GenBox,
pub sustain: GenBox,
pub release: GenBox,
pub gate: GenBox,
pub phase: Phase,
pub cur: f32,
pub attack_cd: f32,
pub decay_cd: f32,
pub buf: SampleBuffer,
}
impl Generator for DAHDSR {
fn eval<'a>(&'a mut self, params: &Parameters) -> &'a SampleBuffer {
self.buf.rate = Rate::Sample;
let delay = self.delay.eval(params).first();
let attack = self.attack.eval(params).first();
let hold = self.attack.eval(params).first();
let decay = self.decay.eval(params).first();
let sustain = self.sustain.eval(params).first();
let release = self.release.eval(params).first();
let gate = self.gate.eval(params).first();
if gate >= 0.5 {
if self.phase == Phase::Release {
self.phase = Phase::Delay;
self.attack_cd = delay;
self.cur = 0.0;
}
} else {
self.phase = Phase::Release;
}
for samp in self.buf.samples.iter_mut() {
match self.phase {
Phase::Delay => {
self.attack_cd -= 1.0;
if self.attack_cd <= 0.0 {
self.phase = Phase::Attack;
}
}
Phase::Attack => {
self.cur += attack;
if self.cur >= 1.0 {
self.cur = 1.0;
self.phase = Phase::Hold;
self.decay_cd = hold;
}
}
Phase::Hold => {
self.decay_cd -= 1.0;
if self.decay_cd <= 0.0 {
self.phase = Phase::Decay;
}
}
Phase::Decay => {
self.cur -= decay;
if self.cur <= sustain {
self.cur = sustain;
self.phase = Phase::Sustain;
}
}
Phase::Sustain => {
self.cur = sustain;
}
Phase::Release => {
self.cur -= release;
if self.cur < 0.0 {
self.cur = 0.0;
}
}
}
*samp = self.cur;
}
&self.buf
}
fn buffer(&self) -> &SampleBuffer {
&self.buf
}
fn set_buffer(&mut self, buf: SampleBuffer) -> SampleBuffer {
mem::replace(&mut self.buf, buf)
}
}
pub struct DAHDSRFactory;
impl GeneratorFactory for DAHDSRFactory {
fn new(&self, params: &mut FactoryParameters) -> Result<GenBox, GenFactoryError> {
Ok(Box::new(DAHDSR {
delay: params.remove_param("delay", 1)?.into_gen()?,
attack: params.remove_param("attack", 2)?.into_gen()?,
hold: params.remove_param("hold", 3)?.into_gen()?,
decay: params.remove_param("decay", 4)?.into_gen()?,
sustain: params.remove_param("sustain", 5)?.into_gen()?,
release: params.remove_param("release", 6)?.into_gen()?,
gate: params.remove_param("gate", 0)?.into_gen()?,
phase: Phase::Release,
cur: 0.0,
attack_cd: 0.0,
decay_cd: 0.0,
buf: SampleBuffer::new(params.env.default_buffer_size),
}))
}
}
pub static Factory: DAHDSRFactory = DAHDSRFactory;
|
