107 lines
3.1 KiB
Rust
107 lines
3.1 KiB
Rust
// Copyright (c) 2021 Weird Constructor <weirdconstructor@gmail.com>
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// This file is a part of HexoDSP. Released under GPL-3.0-or-later.
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// See README.md and COPYING for details.
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use crate::nodes::{NodeAudioContext, NodeExecContext};
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use crate::dsp::{
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NodeId, SAtom, ProcBuf, denorm_offs,
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out, inp, DspNode, LedPhaseVals, NodeContext
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};
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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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/// Initial phase offset
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init_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(nid: &NodeId) -> Self {
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let init_phase = nid.init_phase();
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Self {
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srate: 44100.0,
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phase: init_phase,
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init_phase,
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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 det : &'static str =
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"Sin det\nDetune the oscillator in semitones and cents. \
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the input of this value is rounded to semitones on coarse input. \
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Fine input lets you detune in cents (rounded). \
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A signal sent to this port is not rounded.\n\
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Note: The signal input allows detune +-10 octaves.\
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\nRange: (Knob -0.2 .. 0.2) / (Signal -1.0 .. 1.0)\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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pub const DESC : &'static str =
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r#"Sine Oscillator
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This is a very simple oscillator that generates a sine wave.
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"#;
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pub const HELP : &'static str =
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r#"Sin - A Sine Oscillator
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This is a very simple oscillator that generates a sine wave.
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The 'freq' paramter specifies the frequency, and the 'det' parameter
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allows you to detune the oscillator easily.
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You can send any signal to these input ports. The 'det' parameter takes
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the same signal range as 'freq', which means, that a value of 0.1 detunes
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by one octave. And a value 1.0 detunes by 10 octaves. This means that
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for 'det' to be usefully modulated you need to attenuate the modulation input.
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You can do FM with this node, but for easy FM synthesis there are other
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nodes available.
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"#;
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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 = self.init_phase;
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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, _ectx: &mut NodeExecContext,
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_nctx: &NodeContext,
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_atoms: &[SAtom], inputs: &[ProcBuf],
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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 det = inp::Sin::det(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_offs::Sampl::freq(freq, det.read(frame), 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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