Initial commit of a toy analogue audio generator
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
This commit is contained in:
72
www/bootstrap.js
vendored
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72
www/bootstrap.js
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/**
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* bootstrap.js — ES module entry point.
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*
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* Imports the wasm-pack-generated glue, initialises the WASM binary, then
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* wires up Rust-exported types to the canvas elements in index.html.
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*/
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import init, {
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AudioEngine,
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OscilloscopeView,
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SpectrumView,
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PatchBay,
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SynthParams,
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} from "./pkg/synth_visualiser.js";
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const loader = document.getElementById("loader");
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const status = document.getElementById("status");
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const srLabel = document.getElementById("sample-rate");
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const frameTime = document.getElementById("frame-time");
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async function bootstrap() {
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try {
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await init();
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const engine = new AudioEngine();
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await engine.attach();
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const analyser = engine.analyser_node();
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const oscilloscope = new OscilloscopeView("oscilloscope-canvas", analyser);
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const spectrum = new SpectrumView("spectrum-canvas", analyser);
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const patchbay = new PatchBay("patchbay-canvas");
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// Register module jacks (x, y coordinates relative to the canvas)
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patchbay.register_jack("vco", "out", 50, 60, true);
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patchbay.register_jack("filter", "in", 150, 60, false);
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patchbay.register_jack("filter", "out", 250, 60, true);
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patchbay.register_jack("vca", "in", 350, 60, false);
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patchbay.register_jack("lfo", "cv-out", 450, 60, true);
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patchbay.register_jack("filter", "cv-in", 550, 60, false);
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const pbCanvas = document.getElementById("patchbay-canvas");
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pbCanvas.addEventListener("pointerdown", e => patchbay.on_pointer_down(e.offsetX, e.offsetY));
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pbCanvas.addEventListener("pointermove", e => patchbay.on_pointer_move(e.offsetX, e.offsetY));
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pbCanvas.addEventListener("pointerup", e => patchbay.on_pointer_up(e.offsetX, e.offsetY));
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const params = new SynthParams();
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engine.set_params(params.to_json());
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srLabel.textContent = `SR: ${engine.sample_rate()} Hz`;
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status.textContent = "Running";
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engine.start();
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let last = performance.now();
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function frame(now) {
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oscilloscope.draw();
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spectrum.draw();
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patchbay.draw();
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frameTime.textContent = `frame: ${(now - last).toFixed(1)} ms`;
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last = now;
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requestAnimationFrame(frame);
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}
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requestAnimationFrame(frame);
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loader.classList.add("hidden");
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} catch (err) {
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console.error("[bootstrap] Fatal:", err);
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loader.textContent = `Error: ${err.message ?? err}`;
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}
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}
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bootstrap();
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109
www/index.html
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109
www/index.html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Synth Visualiser</title>
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<style>
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:root {
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--bg: #0d0d0d;
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--panel: #1a1a1a;
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--accent: #00e5ff;
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--text: #e0e0e0;
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}
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*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
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body {
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background: var(--bg);
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color: var(--text);
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font-family: "JetBrains Mono", "Fira Code", monospace;
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display: grid;
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grid-template-rows: auto 1fr auto;
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min-height: 100dvh;
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}
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header {
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padding: 0.75rem 1.5rem;
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border-bottom: 1px solid #333;
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font-size: 0.9rem;
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letter-spacing: 0.15em;
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text-transform: uppercase;
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color: var(--accent);
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}
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main {
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display: grid;
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grid-template-columns: 1fr 1fr;
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grid-template-rows: 1fr 180px;
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gap: 1px;
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background: #333;
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overflow: hidden;
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}
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.panel {
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background: var(--panel);
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display: flex;
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flex-direction: column;
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overflow: hidden;
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}
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.panel__label {
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padding: 0.4rem 0.75rem;
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font-size: 0.7rem;
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letter-spacing: 0.1em;
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text-transform: uppercase;
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color: #666;
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border-bottom: 1px solid #2a2a2a;
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flex-shrink: 0;
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}
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.panel canvas { flex: 1; width: 100%; height: 100%; display: block; }
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.panel--patchbay { grid-column: 1 / -1; }
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footer {
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padding: 0.5rem 1.5rem;
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font-size: 0.7rem;
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color: #444;
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border-top: 1px solid #222;
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display: flex;
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gap: 1.5rem;
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}
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#status { color: var(--accent); }
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#loader {
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position: fixed; inset: 0;
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background: var(--bg);
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display: flex; align-items: center; justify-content: center;
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font-size: 1rem; color: var(--accent);
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z-index: 100; transition: opacity 0.4s;
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}
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#loader.hidden { opacity: 0; pointer-events: none; }
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</style>
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</head>
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<body>
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<div id="loader">Loading WASM module…</div>
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<header>Analogue Synth Visualiser</header>
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<main>
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<section class="panel">
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<div class="panel__label">Oscilloscope</div>
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<canvas id="oscilloscope-canvas"></canvas>
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</section>
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<section class="panel">
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<div class="panel__label">Spectrum</div>
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<canvas id="spectrum-canvas"></canvas>
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</section>
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<section class="panel panel--patchbay">
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<div class="panel__label">Patch Bay</div>
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<canvas id="patchbay-canvas"></canvas>
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</section>
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</main>
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<footer>
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<span id="status">Idle</span>
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<span id="sample-rate"></span>
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<span id="frame-time"></span>
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</footer>
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<!--
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Run first:
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wasm-pack build crates/synth-visualiser --target web --out-dir ../../www/pkg
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Then serve:
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python3 -m http.server --directory www 8080
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-->
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<script type="module" src="./bootstrap.js"></script>
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</body>
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</html>
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