refactored the VPSOscillator into it's own struct
This commit is contained in:
Weird Constructor
parent
16dc1f01f4
commit
ba8e6ec33f
4 changed files with 183 additions and 107 deletions
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@ -194,7 +194,7 @@ impl<const N: usize> Oversampling<N> {
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pub fn set_sample_rate(&mut self, srate: f32) {
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let cutoff = 0.98 * (0.5 * srate);
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let ovr_srate = ((N as f32) * srate);
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let ovr_srate = (N as f32) * srate;
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for filt in &mut self.filters {
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filt.set_coefs(BiquadCoefs::butter_lowpass(ovr_srate, cutoff));
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@ -1475,6 +1475,156 @@ impl PolyBlepOscillator {
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}
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}
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// This oscillator is based on the work "VECTOR PHASESHAPING SYNTHESIS"
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// by: Jari Kleimola*, Victor Lazzarini†, Joseph Timoney†, Vesa Välimäki*
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// *Aalto University School of Electrical Engineering Espoo, Finland;
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// †National University of Ireland, Maynooth Ireland
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//
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// See also this PDF: http://recherche.ircam.fr/pub/dafx11/Papers/55_e.pdf
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/// Vector Phase Shaping Oscillator.
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/// The parameters `d` and `v` control the shape of the sinus
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/// wave. This leads to interesting modulation properties of those
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/// control values.
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///
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///```
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/// use hexodsp::dsp::helpers::{VPSOscillator, rand_01};
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///
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/// // Randomize the initial phase to make cancellation on summing less
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/// // likely:
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/// let mut osc =
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/// VPSOscillator::new(rand_01() * 0.25);
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///
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///
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/// let freq = 440.0; // Hz
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/// let israte = 1.0 / 44100.0; // Seconds per Sample
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/// let d = 0.5; // Range: 0.0 to 1.0
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/// let v = 0.75; // Range: 0.0 to 1.0
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///
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/// let mut block_of_samples = [0.0; 128];
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/// // in your process function:
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/// for output_sample in block_of_samples.iter_mut() {
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/// // It is advised to limit the `v` value, because with certain
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/// // `d` values the combination creates just a DC offset.
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/// let v = VPSOscillator::limit_v(d, v);
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/// *output_sample = osc.next(freq, israte, d, v);
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/// }
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///```
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#[derive(Debug, Clone)]
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pub struct VPSOscillator {
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phase: f32,
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init_phase: f32,
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}
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impl VPSOscillator {
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/// Create a new instance of [VPSOscillator].
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///
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/// * `init_phase` - The initial phase of the oscillator.
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pub fn new(init_phase: f32) -> Self {
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Self {
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phase: 0.0,
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init_phase,
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}
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}
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/// Reset the phase of the oscillator to the initial phase.
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#[inline]
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pub 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 s(p: f32) -> f32 {
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-(std::f32::consts::TAU * p).cos()
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}
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#[inline]
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fn phi_vps(x: f32, v: f32, d: f32) -> f32 {
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if x < d {
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(v * x) / d
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} else {
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v + ((1.0 - v) * (x - d))/(1.0 - d)
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}
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}
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/// This rather complicated function blends out some
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/// combinations of 'd' and 'v' that just lead to a constant DC
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/// offset. Which is not very useful in an audio oscillator
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/// context.
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///
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/// Call this before passing `v` to [VPSOscillator::next].
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#[inline]
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pub fn limit_v(d: f32, v: f32) -> f32 {
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let delta = 0.5 - (d - 0.5).abs();
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if delta < 0.05 {
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let x = (0.05 - delta) * 19.99;
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if d < 0.5 {
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let mm = x * 0.5;
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let max = 1.0 - mm;
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if v > max && v < 1.0 {
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max
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} else if v >= 1.0 && v < (1.0 + mm) {
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1.0 + mm
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} else {
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v
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}
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} else {
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if v < 1.0 {
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v.clamp(x * 0.5, 1.0)
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} else {
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v
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}
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}
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} else {
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v
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}
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}
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/// Creates the next sample of this oscillator.
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///
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/// * `freq` - The frequency in Hz.
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/// * `israte` - The inverse sampling rate, or seconds per sample as in eg. `1.0 / 44100.0`.
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/// * `d` - The phase distortion parameter `d` which must be in the range `0.0` to `1.0`.
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/// * `v` - The phase distortion parameter `v` which must be in the range `0.0` to `1.0`.
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///
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/// It is advised to limit the `v` using the [VPSOscillator::limit_v] function
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/// before calling this function. To prevent DC offsets when modulating the parameters.
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pub fn next(&mut self, freq: f32, israte: f32, d: f32, v: f32) -> f32 {
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let s = Self::s(Self::phi_vps(self.phase, v, d));
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self.phase += freq * israte;
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self.phase = self.phase.fract();
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s
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}
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}
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#[macro_export]
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macro_rules! fa_distort { ($formatter: expr, $v: expr, $denorm_v: expr) => { {
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let s =
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match ($v.round() as usize) {
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0 => "Off",
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1 => "tanh",
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2 => "?!?",
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3 => "fold",
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_ => "?",
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};
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write!($formatter, "{}", s)
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} } }
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#[inline]
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pub fn apply_distortion(s: f32, damt: f32, dist_type: u8) -> f32 {
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match dist_type {
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1 => (damt.clamp(0.01, 1.0) * 100.0 * s).tanh(),
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2 => f_distort(1.0, damt * damt * damt * 1000.0, s),
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3 => {
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let damt = damt.clamp(0.0, 0.99);
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let damt = 1.0 - damt * damt;
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f_fold_distort(1.0, damt, s) * (1.0 / damt)
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},
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_ => s,
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}
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}
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//pub struct UnisonBlep {
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// oscs: Vec<PolyBlepOscillator>,
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//// dc_block: crate::filter::DCBlockFilter,
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@ -72,7 +72,7 @@ use crate::fa_bosc_wtype;
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use crate::fa_biqfilt_type;
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use crate::fa_biqfilt_ord;
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use crate::fa_vosc_ovrsmpl;
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use crate::fa_vosc_dist;
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use crate::fa_distort;
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use node_amp::Amp;
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use node_sin::Sin;
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@ -600,8 +600,8 @@ macro_rules! node_list {
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(3 v n_id n_id r_id f_def stp_d 0.0, 1.0, 0.5)
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(4 vs n_vps d_vps r_vps f_defvlp stp_d 0.0, 1.0, 0.0)
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(5 damt n_id n_id r_id f_def stp_d 0.0, 1.0, 0.0)
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{6 0 dist setting(0) fa_vosc_dist 0 3}
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{7 1 ovrsmpl setting(0) fa_vosc_ovrsmpl 0 1}
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{6 0 dist setting(0) fa_distort 0 3}
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{7 1 ovrsmpl setting(1) fa_vosc_ovrsmpl 0 1}
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[0 sig],
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out => Out UIType::Generic UICategory::IOUtil
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(0 ch1 n_id d_id r_id f_def stp_d -1.0, 1.0, 0.0)
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@ -4,7 +4,7 @@
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use crate::nodes::{NodeAudioContext, NodeExecContext};
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use crate::dsp::biquad::Oversampling;
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use crate::dsp::helpers::{quicker_tanh, f_distort, f_fold_distort};
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use crate::dsp::helpers::{VPSOscillator, apply_distortion};
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use crate::dsp::{
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NodeId, SAtom, ProcBuf, DspNode, LedPhaseVals, NodeContext,
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GraphAtomData, GraphFun,
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@ -21,41 +21,13 @@ macro_rules! fa_vosc_ovrsmpl { ($formatter: expr, $v: expr, $denorm_v: expr) =>
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write!($formatter, "{}", s)
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} } }
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#[macro_export]
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macro_rules! fa_vosc_dist { ($formatter: expr, $v: expr, $denorm_v: expr) => { {
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let s =
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match ($v.round() as usize) {
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0 => "Off",
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1 => "tanh",
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2 => "?!?",
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3 => "fold",
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_ => "?",
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};
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write!($formatter, "{}", s)
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} } }
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#[inline]
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fn apply_distortion(s: f32, damt: f32, dist_type: u8) -> f32 {
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match dist_type {
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1 => (damt.clamp(0.01, 1.0) * 100.0 * s).tanh(),
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2 => f_distort(1.0, damt * damt * damt * 1000.0, s),
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3 => {
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let damt = damt.clamp(0.0, 0.99);
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let damt = 1.0 - damt * damt;
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f_fold_distort(1.0, damt, s) * (1.0 / damt)
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},
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_ => s,
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}
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}
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const OVERSAMPLING : usize = 4;
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/// A simple amplifier
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#[derive(Debug, Clone)]
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pub struct VOsc {
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// osc: PolyBlepOscillator,
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israte: f32,
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phase: f32,
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osc: VPSOscillator,
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oversampling: Box<Oversampling<OVERSAMPLING>>,
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}
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@ -65,7 +37,7 @@ impl VOsc {
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Self {
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israte: 1.0 / 44100.0,
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phase: init_phase,
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osc: VPSOscillator::new(init_phase),
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oversampling: Box::new(Oversampling::new()),
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}
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}
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@ -114,49 +86,6 @@ ways to manipulate them.
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}
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#[inline]
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fn s(p: f32) -> f32 {
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-(std::f32::consts::TAU * p).cos()
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}
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#[inline]
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fn phi_vps(x: f32, v: f32, d: f32) -> f32 {
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if x < d {
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(v * x) / d
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} else {
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v + ((1.0 - v) * (x - d))/(1.0 - d)
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}
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}
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#[inline]
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fn limit_v(d: f32, v: f32) -> f32 {
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let delta = 0.5 - (d - 0.5).abs();
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if delta < 0.05 {
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let x = (0.05 - delta) * 19.99;
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// println!("X: {}, d={}, v={}, delta={}", x, d, v, delta);
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if d < 0.5 {
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let max = 1.0 - (x * 0.5);
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if v > max && v < 1.0 {
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max
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} else if v >= 1.0 && v < (1.0 + max) {
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1.0 + max
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// v.clamp(0.0, max)
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} else {
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v
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}
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} else {
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if v < 1.0 {
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v.clamp(x * 0.5, 1.0)
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} else {
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v
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}
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}
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} else {
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v
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}
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}
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impl DspNode for VOsc {
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fn outputs() -> usize { 1 }
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@ -166,9 +95,8 @@ impl DspNode for VOsc {
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}
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fn reset(&mut self) {
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self.phase = 0.0;
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self.oversampling.reset();
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// self.osc.reset();
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self.osc.reset();
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}
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#[inline]
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@ -195,6 +123,8 @@ impl DspNode for VOsc {
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let dist = dist.i() as u8;
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let oversample = ovrsmpl.i() == 1;
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let mut osc = &mut self.osc;
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if oversample {
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for frame in 0..ctx.nframes() {
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let freq = denorm_offs::VOsc::freq(freq, det.read(frame), frame);
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@ -203,16 +133,12 @@ impl DspNode for VOsc {
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let vs = denorm::VOsc::vs(vs, frame).clamp(0.0, 20.0);
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let damt = denorm::VOsc::damt(damt, frame).clamp(0.0, 1.0);
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let v = limit_v(d, v + vs);
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let v = VPSOscillator::limit_v(d, v + vs);
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let overbuf = self.oversampling.resample_buffer();
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for b in overbuf {
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let s = s(phi_vps(self.phase, v, d));
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let s = osc.next(freq, israte, d, v);
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*b = apply_distortion(s, damt, dist);
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self.phase += freq * israte;
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self.phase = self.phase.fract();
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}
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out.write(frame, self.oversampling.downsample());
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@ -226,15 +152,11 @@ impl DspNode for VOsc {
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let vs = denorm::VOsc::vs(vs, frame).clamp(0.0, 20.0);
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let damt = denorm::VOsc::damt(damt, frame).clamp(0.0, 1.0);
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let v = limit_v(d, v + vs);
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let s = s(phi_vps(self.phase, v, d));
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let v = VPSOscillator::limit_v(d, v + vs);
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let s = osc.next(freq, israte * (OVERSAMPLING as f32), d, v);
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let s = apply_distortion(s, damt, dist);
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out.write(frame, s);
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self.phase += freq * (israte * (OVERSAMPLING as f32));
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self.phase = self.phase.fract();
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}
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}
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@ -242,9 +164,14 @@ impl DspNode for VOsc {
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}
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fn graph_fun() -> Option<GraphFun> {
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let mut osc = VPSOscillator::new(0.0);
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let israte = 1.0 / 128.0;
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Some(Box::new(move |gd: &dyn GraphAtomData, _init: bool, x: f32, _xn: f32| -> f32 {
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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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osc.reset();
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}
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let v = NodeId::VOsc(0).inp_param("v").unwrap().inp();
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let vs = NodeId::VOsc(0).inp_param("vs").unwrap().inp();
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let d = NodeId::VOsc(0).inp_param("d").unwrap().inp();
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@ -257,9 +184,8 @@ impl DspNode for VOsc {
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let damt = gd.get_denorm(damt as u32);
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let dist = gd.get(dist as u32).map(|a| a.i()).unwrap_or(0);
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let v = limit_v(d, v + vs);
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let s = s(phi_vps(x, v, d));
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let v = VPSOscillator::limit_v(d, v + vs);
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let s = osc.next(1.0, israte, d, v);
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let s = apply_distortion(s, damt, dist as u8);
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(s + 1.0) * 0.5
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