118 lines
3.7 KiB
Rust
118 lines
3.7 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, DspNode, LedPhaseVals,
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GraphAtomData, GraphFun, NodeContext,
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};
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use super::helpers::{TriSawLFO, Trigger};
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#[derive(Debug, Clone)]
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pub struct TsLfo {
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lfo: Box<TriSawLFO>,
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trig: Trigger,
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}
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impl TsLfo {
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pub fn new(_nid: &NodeId) -> Self {
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Self {
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lfo: Box::new(TriSawLFO::new()),
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trig: Trigger::new(),
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}
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}
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pub const time : &'static str =
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"TsLfo time\nThe frequency or period time of the LFO, goes all the \
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way from 0.1ms up to 30s.\nRange: (0..1)\n";
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pub const trig : &'static str =
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"TsLfo trig\nTriggers a phase reset of the LFO.\nRange: (0..1)\n";
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pub const rev : &'static str =
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"TsLfo rev\nThe reverse point of the LFO waveform. At 0.5 the LFO \
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will follow a triangle waveform. At 0.0 or 1.0 the LFO waveform will \
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be (almost) a (reversed) saw tooth. Node: A perfect sawtooth can not be \
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achieved with this oscillator, as there will always be a minimal \
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rise/fall time.\nRange: (0..1)\n";
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pub const sig : &'static str =
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"TsLfo sig\nThe LFO output.\nRange: (0..1)";
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pub const DESC : &'static str =
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r#"TriSaw LFO
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This simple LFO has a configurable waveform. You can blend between triangular to sawtooth waveforms using the 'rev' parameter.
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"#;
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pub const HELP : &'static str =
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r#"TsLfo - TriSaw LFO
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This simple LFO has a configurable waveform. You can blend between
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triangular to sawtooth waveforms using the 'rev' parameter.
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Using the 'trig' input you can reset the LFO phase, which allows to use it
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kind of like an envelope.
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"#;
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}
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impl DspNode for TsLfo {
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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.lfo.set_sample_rate(srate);
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}
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fn reset(&mut self) {
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self.lfo.reset();
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self.trig.reset();
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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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use crate::dsp::{out, inp, denorm, at};
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let time = inp::TsLfo::time(inputs);
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let trig = inp::TsLfo::trig(inputs);
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let rev = inp::TsLfo::rev(inputs);
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let out = out::TsLfo::sig(outputs);
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let mut lfo = &mut *self.lfo;
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for frame in 0..ctx.nframes() {
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if self.trig.check_trigger(denorm::TsLfo::trig(trig, frame)) {
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lfo.reset();
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}
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let time_ms = denorm::TsLfo::time(time, frame).clamp(0.1, 300000.0);
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lfo.set(
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1000.0 / time_ms,
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denorm::TsLfo::rev(rev, frame));
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out.write(frame, lfo.next_unipolar() as f32);
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}
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ctx_vals[0].set(out.read(ctx.nframes() - 1));
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}
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fn graph_fun() -> Option<GraphFun> {
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let mut lfo = TriSawLFO::new();
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Some(Box::new(move |gd: &dyn GraphAtomData, init: bool, _x: f32, xn: f32| -> f32 {
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if init {
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lfo.reset();
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let time_idx = NodeId::TsLfo(0).inp_param("time").unwrap().inp();
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let rev_idx = NodeId::TsLfo(0).inp_param("rev").unwrap().inp();
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let time = gd.get_norm(time_idx as u32).sqrt();
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let rev = gd.get_norm(rev_idx as u32);
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lfo.set(0.2 * (1.0 - time) + time * 1.0, rev);
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}
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lfo.next_unipolar() as f32
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}))
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}
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}
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