2021-07-31 09:23:11 +00:00
|
|
|
pub struct DelayLine<const LEN: usize> {
|
|
|
|
buffer: [f32; LEN],
|
|
|
|
index: usize,
|
|
|
|
}
|
|
|
|
impl<const LEN: usize> DelayLine<LEN> {
|
|
|
|
pub fn new() -> Self {
|
|
|
|
Self {
|
|
|
|
buffer: [0.0; LEN],
|
|
|
|
index: 0,
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn read_slice(&self, slice: &mut [f32]) {
|
|
|
|
// Copy values in order
|
|
|
|
for i in 0..LEN {
|
|
|
|
slice[i] = self.wrapped_index(self.index + i);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn write_and_advance(&mut self, value: f32) {
|
|
|
|
self.buffer[self.index] = value;
|
|
|
|
|
|
|
|
if self.index == LEN - 1 {
|
|
|
|
self.index = 0;
|
|
|
|
} else {
|
|
|
|
self.index += 1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Returns the sample at idx after taking modulo LEN
|
|
|
|
pub fn wrapped_index(&self, idx: usize) -> f32 {
|
|
|
|
self.buffer[idx % LEN]
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Indexes the buffer but interpolates between the current and the next sample
|
|
|
|
pub fn floating_index(&self, val: f32) -> f32 {
|
|
|
|
let idx = val.trunc() as usize;
|
2021-08-02 14:56:42 +00:00
|
|
|
let frac = val.fract();
|
2021-07-31 09:23:11 +00:00
|
|
|
|
2021-08-02 14:56:42 +00:00
|
|
|
// TODO uhm idk what this should be, but we don't want an underflow so yeah,
|
|
|
|
let xm1 = if idx == 0 {
|
|
|
|
0.0
|
|
|
|
} else {
|
|
|
|
self.wrapped_index(idx - 1)
|
|
|
|
};
|
|
|
|
let x0 = self.wrapped_index(idx);
|
|
|
|
let x1 = self.wrapped_index(idx + 1);
|
|
|
|
let x2 = self.wrapped_index(idx + 2);
|
|
|
|
|
|
|
|
// linear interpolation
|
|
|
|
// return (1.0 - frac) * x0 + frac * x1;
|
2021-07-31 09:23:11 +00:00
|
|
|
|
2021-08-02 14:56:42 +00:00
|
|
|
crate::hermite(frac, xm1, x0, x1, x2)
|
2021-07-31 09:23:11 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/// Get a reference to the delay line's index.
|
|
|
|
pub fn idx(&self) -> &usize {
|
|
|
|
&self.index
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Get a reference to the delay line's buffer.
|
|
|
|
pub fn buffer(&self) -> &[f32; LEN] {
|
|
|
|
&self.buffer
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
pub struct DelayLines<const LEN: usize> {
|
|
|
|
pub l: DelayLine<LEN>,
|
|
|
|
pub r: DelayLine<LEN>,
|
|
|
|
}
|
|
|
|
impl<const LEN: usize> DelayLines<LEN> {
|
|
|
|
pub fn new() -> Self {
|
|
|
|
Self {
|
|
|
|
l: DelayLine::<LEN>::new(),
|
|
|
|
r: DelayLine::<LEN>::new(),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn read_slices(&self, l: &mut [f32], r: &mut [f32]) {
|
|
|
|
self.l.read_slice(l);
|
|
|
|
self.r.read_slice(r);
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn write_and_advance(&mut self, l: f32, r: f32) {
|
|
|
|
self.l.write_and_advance(l);
|
|
|
|
self.r.write_and_advance(r);
|
|
|
|
}
|
|
|
|
}
|