Matt Spencer
496b6bdc71
Key components: - no_std core so it can be used bare metal on embedded systems - default implementation for RPi 2350, with midi input and I2s output using PIO - Visualiser for the web to play with on a dev system
53 lines
1.8 KiB
Rust
53 lines
1.8 KiB
Rust
//! Synthesiser parameter model — mirrors synth-core state.
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//! Serialised as JSON for postMessage() across the AudioWorklet MessagePort.
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use wasm_bindgen::prelude::*;
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use serde::{Serialize, Deserialize};
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#[wasm_bindgen]
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#[derive(Clone, Debug, Serialize, Deserialize)]
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pub struct SynthParams {
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pub osc_freq: f32, // Hz
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pub osc_wave: u8, // 0=Sine 1=Saw 2=Square 3=Triangle
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pub filter_cutoff: f32, // Hz
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pub filter_res: f32, // 0.0–1.0
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pub env_attack: f32, // seconds
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pub env_decay: f32,
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pub env_sustain: f32, // 0.0–1.0
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pub env_release: f32,
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pub lfo_rate: f32, // Hz
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pub lfo_depth: f32, // 0.0–1.0
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pub master_gain: f32, // 0.0–1.0
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}
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#[wasm_bindgen]
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impl SynthParams {
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#[wasm_bindgen(constructor)]
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pub fn new() -> Self {
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Self {
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osc_freq: 440.0,
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osc_wave: 1,
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filter_cutoff: 2000.0,
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filter_res: 0.3,
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env_attack: 0.01,
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env_decay: 0.1,
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env_sustain: 0.7,
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env_release: 0.3,
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lfo_rate: 2.0,
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lfo_depth: 0.0,
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master_gain: 0.8,
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}
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}
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pub fn to_json(&self) -> String {
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// serde_json would pull in std; for WASM we use the js glue instead.
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// This is a simple manual serialisation for the scaffold.
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format!(
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r#"{{"osc_freq":{:.2},"osc_wave":{},"filter_cutoff":{:.2},"filter_res":{:.3},"env_attack":{:.4},"env_decay":{:.4},"env_sustain":{:.3},"env_release":{:.4},"lfo_rate":{:.3},"lfo_depth":{:.3},"master_gain":{:.3}}}"#,
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self.osc_freq, self.osc_wave, self.filter_cutoff, self.filter_res,
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self.env_attack, self.env_decay, self.env_sustain, self.env_release,
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self.lfo_rate, self.lfo_depth, self.master_gain
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)
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}
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}
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