156 lines
3.5 KiB
Rust
156 lines
3.5 KiB
Rust
#![allow(incomplete_features)]
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#![feature(generic_associated_types)]
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#![feature(min_specialization)]
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use std::f32::consts::PI;
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use serde::{Serialize, Deserialize};
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use baseplug::{
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ProcessContext,
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Plugin,
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MidiReceiver,
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util::db_to_coeff
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};
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baseplug::model! {
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#[derive(Debug, Serialize, Deserialize)]
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struct MidiSineModel {
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#[model(min = -90.0, max = 3.0)]
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#[parameter(name = "gain", unit = "Decibels",
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gradient = "Power(0.15)")]
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gain: f32,
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#[model(min = 0.05, max = 0.95)]
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#[parameter(name = "phase distortion")]
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pd: f32,
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#[model(min = 220.0, max = 880.0)]
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#[parameter(name = "a4 tuning", gradient = "Exponential")]
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a4: f32
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}
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}
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impl Default for MidiSineModel {
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fn default() -> Self {
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Self {
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gain: db_to_coeff(-3.0),
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pd: 0.5,
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a4: 440.0
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}
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}
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}
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struct Oscillator {
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phase: f64,
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step: f64
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}
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impl Oscillator {
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#[inline]
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fn new() -> Self {
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Self {
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// cheeky little hack to keep cosine output from jumping to +1.0 when adding the plugin
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// to the host ;>
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phase: 0.25,
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step: 0.0
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}
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}
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#[inline]
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fn set_frequency(&mut self, frequency: f64, sample_rate: f64) {
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self.step = frequency / sample_rate;
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}
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#[inline]
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fn tick(&mut self) {
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self.phase += self.step;
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// usually cheaper than modulo
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while self.phase > 1.0 {
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self.phase -= 1.0;
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}
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}
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#[inline]
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fn pd_phase(&self, d: f32) -> f32 {
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let mut phase = self.phase as f32;
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if phase < d {
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phase /= d;
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} else {
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phase = 1.0 + ((phase - d) / (1.0 - d));
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}
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phase * 0.5
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}
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}
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struct MidiSine {
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osc: Oscillator,
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sample_rate: f32,
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freq_ratio: f32,
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}
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impl Plugin for MidiSine {
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const NAME: &'static str = "midi sine plug";
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const PRODUCT: &'static str = "midi sine plug";
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const VENDOR: &'static str = "spicy plugins & co";
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const INPUT_CHANNELS: usize = 0;
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const OUTPUT_CHANNELS: usize = 2;
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type Model = MidiSineModel;
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#[inline]
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fn new(sample_rate: f32, _model: &MidiSineModel) -> Self {
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Self {
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osc: Oscillator::new(),
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sample_rate,
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freq_ratio: 0.0
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}
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}
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#[inline]
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fn process(&mut self, model: &MidiSineModelProcess, ctx: &mut ProcessContext<Self>) {
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let output = &mut ctx.outputs[0].buffers;
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for i in 0..ctx.nframes {
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if model.a4.is_smoothing() {
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self.osc.set_frequency((self.freq_ratio * model.a4[i]) as f64, self.sample_rate as f64);
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}
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let wave = {
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let phase = self.osc.pd_phase(model.pd[i]);
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(phase * 2.0 * PI).cos()
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};
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self.osc.tick();
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output[0][i] = wave * model.gain[i];
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output[1][i] = wave * model.gain[i];
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}
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}
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}
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impl MidiReceiver for MidiSine {
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fn midi_input(&mut self, model: &MidiSineModelProcess, data: [u8; 3]) {
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match data[0] {
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// note on
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0x90 => {
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let ratio = ((data[1] as f32 - 69.0) / 12.0).exp2();
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self.freq_ratio = ratio;
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let freq = ratio * model.a4[0];
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self.osc.set_frequency(freq as f64, self.sample_rate as f64);
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},
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_ => ()
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}
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}
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}
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baseplug::vst2!(MidiSine, b"~Ss~");
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