HexoDSP/src/dsp/node_bosc.rs

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// Copyright (c) 2021 Weird Constructor <weirdconstructor@gmail.com>
2021-08-04 01:58:43 +00:00
// This file is a part of HexoDSP. Released under GPL-3.0-or-later.
// See README.md and COPYING for details.
use crate::nodes::{NodeAudioContext, NodeExecContext};
use crate::dsp::{
NodeId, SAtom, ProcBuf, DspNode, LedPhaseVals, NodeContext,
GraphAtomData, GraphFun,
};
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use crate::dsp::helpers::PolyBlepOscillator;
#[macro_export]
macro_rules! fa_bosc_wtype { ($formatter: expr, $v: expr, $denorm_v: expr) => { {
let s =
match ($v.round() as usize) {
0 => "Sin",
1 => "Tri",
2 => "Saw",
3 => "Pulse",
_ => "?",
};
write!($formatter, "{}", s)
} } }
/// A simple amplifier
#[derive(Debug, Clone)]
pub struct BOsc {
osc: PolyBlepOscillator,
israte: f32,
}
impl BOsc {
pub fn new(nid: &NodeId) -> Self {
let init_phase = nid.init_phase();
Self {
osc: PolyBlepOscillator::new(init_phase),
israte: 1.0 / 44100.0,
}
}
pub const freq : &'static str =
"BOsc freq\nBase frequency of the oscillator.\n\nRange: (-1..1)\n";
pub const det : &'static str =
"BOsc 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\
Note: The signal input allows detune +-10 octaves.\
\nRange: (Knob -0.2 .. 0.2) / (Signal -1.0 .. 1.0)\n";
pub const pw : &'static str =
"BOsc pw\n\nRange: (0..1)\n";
pub const wtype : &'static str =
"BOsc wtype\nWaveform type\nAvailable waveforms:\n\
Sin - Sine Waveform\n\
Tri - Triangle Waveform\n\
Saw - Sawtooth Waveform\n\
Pulse - Pulse Waveform with configurable pulse width";
pub const sig : &'static str =
"BOsc sig\nOscillator output\nRange: (-1..1)\n";
pub const DESC : &'static str =
r#"Basic Oscillator
A very basic oscillator with a sine, triangle, pulse and sawtooth waveform.
"#;
pub const HELP : &'static str =
r#"BOsc - Basic Waveform Oscillator
A very basic oscillator with a sine, triangle, pulse and sawtooth waveform.
The pulse width `pw` parameter only has an effect for the `Pulse` waveform.
"#;
}
impl DspNode for BOsc {
fn outputs() -> usize { 1 }
fn set_sample_rate(&mut self, srate: f32) {
self.israte = 1.0 / srate;
}
fn reset(&mut self) {
self.osc.reset();
}
#[inline]
fn process<T: NodeAudioContext>(
&mut self, ctx: &mut T, _ectx: &mut NodeExecContext,
_nctx: &NodeContext,
atoms: &[SAtom], inputs: &[ProcBuf],
outputs: &mut [ProcBuf], ctx_vals: LedPhaseVals)
{
use crate::dsp::{out, inp, denorm, denorm_offs, at};
let freq = inp::BOsc::freq(inputs);
let det = inp::BOsc::det(inputs);
let pw = inp::BOsc::pw(inputs);
let out = out::BOsc::sig(outputs);
let wtype = at::BOsc::wtype(atoms);
let israte = self.israte;
match wtype.i() {
0 => { // sin
for frame in 0..ctx.nframes() {
let freq =
denorm_offs::BOsc::freq(
freq, det.read(frame), frame);
out.write(
frame,
self.osc.next_sin(freq, israte));
}
},
1 => { // tri
for frame in 0..ctx.nframes() {
let freq =
denorm_offs::BOsc::freq(
freq, det.read(frame), frame);
out.write(
frame,
self.osc.next_tri(freq, israte));
}
},
2 => { // saw
for frame in 0..ctx.nframes() {
let freq =
denorm_offs::BOsc::freq(
freq, det.read(frame), frame);
out.write(
frame,
self.osc.next_saw(freq, israte));
}
},
3 | _ => { // pulse
for frame in 0..ctx.nframes() {
let freq =
denorm_offs::BOsc::freq(
freq, det.read(frame), frame);
let pw = denorm::BOsc::pw(pw, frame);
out.write(
frame,
self.osc.next_pulse_no_dc(freq, israte, pw));
}
}
}
ctx_vals[0].set(out.read(ctx.nframes() - 1));
}
fn graph_fun() -> Option<GraphFun> {
let mut osc = Box::new(PolyBlepOscillator::new(0.0));
let israte = 1.0 / 128.0;
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Some(Box::new(move |gd: &dyn GraphAtomData, init: bool, _x: f32, _xn: f32| -> f32 {
let wtype = NodeId::BOsc(0).inp_param("wtype").unwrap().inp();
let pw = NodeId::BOsc(0).inp_param("pw").unwrap().inp();
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// let det = NodeId::BOsc(0).inp_param("det").unwrap().inp();
let wtype = gd.get(wtype as u32).map(|a| a.i()).unwrap_or(0);
let pw = gd.get_denorm(pw as u32);
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// let det = gd.get_norm(det as u32);
// the detune scaling with lerp is wrong...
// let pow = lerp((det + 0.2) * (1.0 / 0.4), 0.25, 4.0);
// let freq = (2.0_f32).powf(pow);
let freq = 2.0;
if init {
osc.reset();
if wtype == 1 {
// we need to initialize the leaky integrator
// in the triangle wave form, or it would look
// a bit weird.
for _ in 0..256 { osc.next_tri(freq, israte); }
}
}
let s =
match wtype {
0 => (osc.next_sin(freq, israte) + 1.0) * 0.5,
1 => (osc.next_tri(freq, israte) + 1.0) * 0.5,
2 => (osc.next_saw(freq, israte) + 1.0) * 0.5,
3 | _ => (osc.next_pulse_no_dc(freq, israte, pw)
+ 1.0) * 0.5,
};
s * 0.9 + 0.05
}))
}
}