HexoDSP/src/dsp/node_sin.rs

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// Copyright (c) 2021 Weird Constructor <weirdconstructor@gmail.com>
// This is a part of HexoDSP. Released under (A)GPLv3 or any later.
// See README.md and COPYING for details.
use crate::nodes::{NodeAudioContext, NodeExecContext};
use crate::dsp::{NodeId, SAtom, ProcBuf, denorm, out, inp, DspNode, LedPhaseVals};
use crate::dsp::helpers::fast_sin;
/// A sine oscillator
#[derive(Debug, Clone)]
pub struct Sin {
/// Sample rate
srate: f32,
/// Oscillator phase
phase: f32,
}
const TWOPI : f32 = 2.0 * std::f32::consts::PI;
impl Sin {
pub fn new(_nid: &NodeId) -> Self {
Self {
srate: 44100.0,
phase: 0.0,
}
}
pub const freq : &'static str =
"Sin freq\nFrequency of the oscillator.\n\nRange: (-1..1)\n";
pub const det : &'static str =
"Sin det\nDetune the oscillator in semitones and cents. \
the input of this value is rounded to semitones on coarse input. \
Fine input lets you detune in cents (rounded). \
A signal sent to this port is not rounded.\
\n\nRange: (-1..1)\n";
pub const sig : &'static str =
"Sin sig\nOscillator signal output.\n\nRange: (-1..1)\n";
}
impl DspNode for Sin {
fn outputs() -> usize { 1 }
fn set_sample_rate(&mut self, srate: f32) {
self.srate = srate;
}
fn reset(&mut self) {
self.phase = 0.0;
}
#[inline]
fn process<T: NodeAudioContext>(
&mut self, ctx: &mut T, _ectx: &mut NodeExecContext,
_atoms: &[SAtom], _params: &[ProcBuf], inputs: &[ProcBuf],
outputs: &mut [ProcBuf], ctx_vals: LedPhaseVals)
{
let o = out::Sin::sig(outputs);
let freq = inp::Sin::freq(inputs);
let isr = 1.0 / self.srate;
let mut last_val = 0.0;
for frame in 0..ctx.nframes() {
let freq = denorm::Sin::freq(freq, frame);
last_val = fast_sin(self.phase * TWOPI);
o.write(frame, last_val);
self.phase += freq * isr;
self.phase = self.phase.fract();
}
ctx_vals[0].set(last_val);
}
}