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