69 lines
1.8 KiB
Rust
69 lines
1.8 KiB
Rust
// 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 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);
|
|
}
|
|
}
|