Blame src/main.ts at 76b78438fb7aee56f7d43976c70aaa83880dbfbe

5778036 cymbalsim: scripted plate and cymbal designer with a modal linear model and a von Karman GPU modelJeremy Magland 1 month ago1// The application: the design script, the two run modes (the linear modal

2// model on the CPU workers and the full nonlinear simulation on the GPU),

3// the plate view, the movie, the audio, and the spectrogram.

5import { compileDesign, evaluatePlate, isFlat, profileStats, type Design, DesignError } from "./design.ts";

6import { PRESETS, DEFAULT_PRESET, presetById } from "./presets.ts";

7import {

8 type Plate,

9 type SimParams,

10 defaultParams,

11 countInside,

12 massProperties,

13 meanThickness,

14 thicknessRange,

15 standRates,

16 strikePoint,

17 strikePatch,

18 listenerPosition,

19 dispersionFrequency,

20 inPlaneSpeed,

21 CFL,

22} from "./params.ts";

23import { fitSigma, fittedRate, t60At, LN1000, decayRate } from "./loss.ts";

24import { assemble, type LinearSystem } from "./model/assemble.ts";

25import { maxAngularFrequency, fullLoss, type FullLoss } from "./model/reference.ts";

26import { type ModeSet } from "./modal/modes.ts";

27import { WorkerPool } from "./modal/pool.ts";

28import { modalModel, modeShapeOnGrid, type ModalModel, type ContactResult } from "./modal/synth.ts";

29import { Simulation } from "./sim/simulation.ts";

30import { runSelfTest } from "./sim/selftest.ts";

31import { PlateRenderer, type ViewMode, type ColorMode } from "./render/renderer.ts";

32import { Spectrogram } from "./audio/spectrogram.ts";

33import { Player } from "./audio/player.ts";

34import { encodeWav } from "./audio/wav.ts";

35import { levelGain, applyLevel, peakDbfs, peakSpl, type LevelMode } from "./audio/level.ts";

36import { DesignEditor } from "./ui/editor.ts";

37import { ParamForm, formatNumber } from "./ui/form.ts";

38import { ModeBrowser } from "./ui/modes.ts";

40type RunMode = "linear" | "full";

41type ViewState = "design" | "mode" | "live" | "movie";

43const $ = <T extends HTMLElement>(id: string): T => document.getElementById(id) as T;

45/** A recording: the listener signal and the movie of one run, from either model. */

46interface Recording {

47 audio: Float32Array;

48 samples: number;

49 fs: number;

50 frames: Float32Array[];

51 fps: number;

52 source: RunMode;

53}

55class App {

56 // GPU

57 device: GPUDevice | null = null;

58 // Design and plate

59 design: Design | null = null;

60 plate: Plate | null = null;

61 plateSpacing = 0;

62 designGeneration = 0;

63 // Linear model

64 pool: WorkerPool | null = null;

65 sys: LinearSystem | null = null;

66 modes: ModeSet | null = null;

67 model: ModalModel | null = null;

68 modesBusy: Promise<void> = Promise.resolve();

9cfbfd1 Modes on demand with a cache, progress bar in the head, play rewinds from live or the end, exaggeration 1Jeremy Magland 1 month ago69 /** Modes of recent designs, keyed by the script, the spacing and the cutoff; the newest entry is last. */

70 modesCache = new Map<string, { sys: LinearSystem; modes: ModeSet; model: ModalModel }>();

71 headProgress!: HTMLDivElement;

72 /** The cache key of the modes the pool currently holds. */

73 currentModesKey: string | null = null;

74 headProgressBar!: HTMLDivElement;

5778036 cymbalsim: scripted plate and cymbal designer with a modal linear model and a von Karman GPU modelJeremy Magland 1 month ago75 synthBusy = false;

76 synthPending = false;

77 synthesized = false;

78 lastContact: ContactResult | null = null;

79 // Full simulation

80 sim: Simulation | null = null;

81 running = false;

82 paused = false;

83 // Recording and view

84 rec: Recording | null = null;

85 view: ViewState = "design";

86 frameIndex = 0;

87 runMode: RunMode = "linear";

88 // UI

89 editor!: DesignEditor;

90 form!: ParamForm;

91 modeBrowser!: ModeBrowser;

92 renderer!: PlateRenderer;

93 spec!: Spectrogram;

94 player = new Player();

95 levelMode: LevelMode = "absolute";

96 gainDb = -40;

97 showTicks = true;

9cfbfd1 Modes on demand with a cache, progress bar in the head, play rewinds from live or the end, exaggeration 1Jeremy Magland 1 month ago98 viewOpts = { mode: "3d" as ViewMode, color: "height" as ColorMode, showProfile: true, exaggeration: 1, range: 0 };

5778036 cymbalsim: scripted plate and cymbal designer with a modal linear model and a von Karman GPU modelJeremy Magland 1 month ago99 // Controls

100 runModeSel!: HTMLSelectElement;

101 durationInput!: HTMLInputElement;

102 startBtn!: HTMLButtonElement;

103 pauseBtn!: HTMLButtonElement;

104 stopBtn!: HTMLButtonElement;

105 continueBtn!: HTMLButtonElement;

106 runStatus!: HTMLDivElement;

107 scrub!: HTMLInputElement;

108 timeLabel!: HTMLSpanElement;

109 playBtn!: HTMLButtonElement;

110 liveBtn!: HTMLButtonElement;

111 designBtn!: HTMLButtonElement;

112 peakLabel!: HTMLSpanElement;

113 downloadBtn!: HTMLButtonElement;

114 overlay!: HTMLDivElement;

115 synthTimer: number | null = null;

116

117 async init(): Promise<void> {

118 const url = new URLSearchParams(location.search);

119 if (!url.has("nogpu") && navigator.gpu) {

120 try {

121 const adapter = await navigator.gpu.requestAdapter();

122 if (adapter) this.device = await adapter.requestDevice();

123 } catch (e) {

124 console.warn("WebGPU unavailable", e);

125 }

126 }

127 if (typeof Worker !== "undefined") this.pool = new WorkerPool(WorkerPool.defaultSize());

128

129 this.buildControls();

130 this.buildForm();

131 this.buildViewToolbar();

132 this.buildMovieToolbar();

133 this.buildSpecToolbar();

134 this.buildSplitter();

135

136 this.renderer = new PlateRenderer($("view"), this.device);

137 if (!this.renderer.has3d) this.viewOpts.mode = "2d";

138 this.renderer.setOptions(this.viewOpts);

139 this.overlay = $("viewOverlay");

140 const p = this.form.get();

141 this.spec = new Spectrogram($("spec"), { fs: p.fs, window: 2048, hop: 256, maxHz: 12000, dbRange: 80, logFreq: false });

142 this.spec.setDuration(p.duration);

143 this.modeBrowser = new ModeBrowser($("modes"), (m) => this.showMode(m));

144 this.editor = new DesignEditor($("design"), { onSource: (src) => this.onSource(src) });

145

146 if (url.has("mode")) this.setRunMode(url.get("mode") === "full" ? "full" : "linear");

147 else this.setRunMode(this.device ? "linear" : "linear");

148 const preset = url.get("preset");

149 this.editor.selectPreset(preset && presetById(preset) ? preset : DEFAULT_PRESET);

150 this.form.applyUrl(url);

151 this.durationInput.value = String(this.form.get().duration);

152

153 const loop = () => {

154 this.renderer.render();

155 requestAnimationFrame(loop);

156 };

157 requestAnimationFrame(loop);

158 window.addEventListener("resize", () => { this.renderer.resize(); this.spec.resize(); });

159 this.renderer.resize();

160 this.spec.resize();

161

162 // Test hooks.

163 (window as unknown as { cymbalsim: unknown }).cymbalsim = {

164 app: this,

165 selftest: () => this.selfTest(),

166 runLinear: () => this.runLinear(),

167 runFull: () => this.runFull(),

168 modesReady: () => this.modesBusy,

169 status: () => this.testStatus(),

170 };

171 if (url.has("selftest")) {

172 const r = await this.selfTest();

173 this.overlay.textContent = r;

174 }

175 if (url.has("autostart")) {

176 await this.modesBusy;

177 this.start();

178 }

179 }

180

181 // ---------- Controls ----------

182

183 private buildControls(): void {

184 const c = $("controls");

185 this.runModeSel = document.createElement("select");

186 this.runModeSel.innerHTML = `<option value="linear">Linear (modal)</option><option value="full">Full (nonlinear, GPU)</option>`;

187 this.runModeSel.addEventListener("change", () => this.setRunMode(this.runModeSel.value as RunMode));

188 const durLabel = document.createElement("label");

189 durLabel.textContent = "Duration";

190 this.durationInput = document.createElement("input");

191 this.durationInput.type = "number"; this.durationInput.min = "0.1"; this.durationInput.step = "0.5"; this.durationInput.style.width = "60px";

192 this.durationInput.addEventListener("change", () => {

193 const d = Math.max(0.1, Number(this.durationInput.value) || 1);

194 this.form.set("duration", d);

195 this.spec.setDuration(d);

196 if (this.sim) this.sim.setDuration(d);

197 this.updateButtons();

198 });

199 const s = document.createElement("span"); s.textContent = " s";

200 durLabel.append(this.durationInput, s);

201 this.startBtn = this.button("Start", () => this.start(), "primary");

202 this.pauseBtn = this.button("Pause", () => this.pause());

203 this.stopBtn = this.button("Stop", () => this.stopRun());

204 this.continueBtn = this.button("Continue", () => this.continueRun());

205 c.append(this.runModeSel, durLabel, this.startBtn, this.pauseBtn, this.stopBtn, this.continueBtn);

9cfbfd1 Modes on demand with a cache, progress bar in the head, play rewinds from live or the end, exaggeration 1Jeremy Magland 1 month ago206 this.headProgress = document.createElement("div");

207 this.headProgress.className = "progress";

208 this.headProgress.hidden = true;

209 this.headProgressBar = document.createElement("div");

210 this.headProgress.append(this.headProgressBar);

5778036 cymbalsim: scripted plate and cymbal designer with a modal linear model and a von Karman GPU modelJeremy Magland 1 month ago211 this.runStatus = document.createElement("div");

212 this.runStatus.className = "status";

9cfbfd1 Modes on demand with a cache, progress bar in the head, play rewinds from live or the end, exaggeration 1Jeremy Magland 1 month ago213 $("sidebarHead").append(this.headProgress, this.runStatus);

214 }

215

216 /** The progress bar under the run controls (fraction 0..1, or null to hide) with a status message. */

217 private setProgress(fraction: number | null, message?: string): void {

218 this.headProgress.hidden = fraction === null;

219 if (fraction !== null) this.headProgressBar.style.width = `${Math.round(100 * fraction)}%`;

220 if (message !== undefined) this.runStatus.textContent = message;

5778036 cymbalsim: scripted plate and cymbal designer with a modal linear model and a von Karman GPU modelJeremy Magland 1 month ago221 }

222

223 private button(label: string, onClick: () => void, cls = ""): HTMLButtonElement {

224 const b = document.createElement("button");

225 b.textContent = label;

226 if (cls) b.className = cls;

227 b.addEventListener("click", onClick);

228 return b;

229 }

230

231 private buildForm(): void {

232 this.form = new ParamForm(

233 $("params"),

234 [

235 {

236 title: "Strike",

237 notes: true,

238 fields: [

239 { key: "strikeFracX", label: "Position x (fraction of width)", step: 0.05, min: 0, max: 1 },

240 { key: "strikeFracY", label: "Position y (fraction of height)", step: 0.05, min: 0, max: 1 },

241 { key: "strikeVelocity", label: "Stick speed", unit: "m/s", step: 0.5, min: 0.01 },

242 { key: "stickMass", label: "Stick mass", unit: "g", scale: 1e-3, step: 5, min: 1 },

243 { key: "contactStiffness", label: "Contact stiffness K", unit: "N/m^a", step: 1e8, min: 1e5 },

244 { key: "contactExponent", label: "Contact exponent a", step: 0.1, min: 1, max: 3 },

245 { key: "contactRadius", label: "Tip radius", unit: "mm", scale: 1e-3, step: 1, min: 0.5 },

246 ],

247 },

248 {

249 title: "Listener",

250 fields: [

251 { key: "listenerDist", label: "Distance", unit: "m", step: 0.1, min: 0.05, live: true },

252 { key: "listenerAngle", label: "Angle from the normal", unit: "deg", step: 5, min: 0, max: 90, live: true },

253 { key: "listenerAzimuth", label: "Azimuth", unit: "deg", step: 15, min: -180, max: 180, live: true },

254 ],

255 },

256 {

257 title: "Grid and numerics",

258 notes: true,

259 fields: [

260 { key: "spacing", label: "Grid spacing", unit: "mm", scale: 1e-3, step: 1, min: 2 },

261 { key: "modeMaxFreq", label: "Modes up to", unit: "Hz", step: 1000, min: 200 },

262 { key: "padLiftoff", label: "Pads lift off (full model)", kind: "checkbox" },

263 { key: "fs", label: "Sample rate", kind: "select", options: [{ value: 44100, label: "44.1 kHz" }, { value: 48000, label: "48 kHz" }, { value: 96000, label: "96 kHz" }] },

264 { key: "fps", label: "Movie frame rate", kind: "select", options: [{ value: 60, label: "60" }, { value: 120, label: "120" }, { value: 240, label: "240" }] },

265 ],

266 },

267 ],

268 defaultParams,

269 (key, _value, live) => this.onParam(key, live),

270 );

271 }

272

273 private onParam(key: keyof SimParams, live: boolean): void {

274 const p = this.form.get();

275 if (key === "spacing" || key === "modeMaxFreq" || key === "fs") {

276 if (this.design) this.rebuildPlate(this.design);

277 return;

278 }

279 if (key === "fps") { this.updateNotes(); return; }

280 if (key === "padLiftoff") { this.updateNotes(); return; }

281 if (live && this.sim) this.sim.setListener(p);

282 if (key.startsWith("strike") || key.startsWith("stick") || key.startsWith("contact") || key.startsWith("listener")) {

283 this.updateMarkers();

284 this.updateNotes();

285 if (this.runMode === "linear" && this.synthesized) this.scheduleSynth();

286 }

287 }

288

289 private buildViewToolbar(): void {

290 const t = $("viewToolbar");

291 const modeSel = document.createElement("select");

292 modeSel.innerHTML = `<option value="3d">3D</option><option value="2d">2D</option>`;

293 modeSel.addEventListener("change", () => { this.viewOpts.mode = modeSel.value as ViewMode; this.renderer.setOptions(this.viewOpts); });

294 const colorSel = document.createElement("select");

295 colorSel.innerHTML = `<option value="height">Height</option><option value="thickness">Thickness</option>`;

296 colorSel.addEventListener("change", () => { this.viewOpts.color = colorSel.value as ColorMode; this.renderer.setOptions(this.viewOpts); });

297 const exag = document.createElement("input");

298 exag.type = "number"; exag.min = "1"; exag.step = "5"; exag.value = String(this.viewOpts.exaggeration); exag.style.width = "60px";

299 exag.addEventListener("change", () => { this.viewOpts.exaggeration = Math.max(0.1, Number(exag.value) || 1); this.renderer.setOptions(this.viewOpts); });

300 const range = document.createElement("input");

301 range.type = "number"; range.min = "0"; range.step = "0.1"; range.value = "0"; range.style.width = "60px";

302 range.addEventListener("change", () => { this.viewOpts.range = Math.max(0, Number(range.value) || 0) * 1e-3; this.renderer.setOptions(this.viewOpts); });

303 const prof = document.createElement("input");

304 prof.type = "checkbox"; prof.checked = this.viewOpts.showProfile;

305 prof.addEventListener("change", () => { this.viewOpts.showProfile = prof.checked; this.renderer.setOptions(this.viewOpts); });

306 const lab = (text: string, ...els: HTMLElement[]) => { const l = document.createElement("label"); l.append(text, ...els); return l; };

307 t.append(lab("View", modeSel), lab("Color", colorSel), lab("Exaggeration", exag), lab("Range (mm, 0 = auto)", range), lab("Show profile", prof));

308 if (!this.device) {

309 modeSel.value = "2d"; modeSel.disabled = true;

310 const w = document.createElement("span"); w.id = "nogpu"; w.textContent = "WebGPU is not available: the 2D view and the linear model only.";

311 t.append(w);

312 }

313 }

314

315 private buildMovieToolbar(): void {

316 const t = $("movieToolbar");

317 this.playBtn = this.button("Play", () => this.togglePlay());

318 this.liveBtn = this.button("Live", () => this.setView("live"));

319 this.designBtn = this.button("Design", () => this.setView("design"));

320 this.scrub = document.createElement("input");

321 this.scrub.type = "range"; this.scrub.className = "scrub"; this.scrub.min = "0"; this.scrub.max = "0"; this.scrub.value = "0";

322 this.scrub.addEventListener("input", () => { this.frameIndex = Number(this.scrub.value); this.setView("movie"); this.showFrame(); });

323 this.timeLabel = document.createElement("span");

324 this.timeLabel.textContent = "0.000 s";

325 const levelSel = document.createElement("select");

326 levelSel.innerHTML = `<option value="absolute">Absolute level</option><option value="loudness">Normalize loudness</option><option value="peak">Normalize peak</option>`;

327 levelSel.addEventListener("change", () => { this.levelMode = levelSel.value as LevelMode; this.updatePeak(); });

328 const gain = document.createElement("input");

329 gain.type = "range"; gain.min = "-60"; gain.max = "40"; gain.step = "1"; gain.value = String(this.gainDb);

330 const gainLabel = document.createElement("span"); gainLabel.textContent = `${this.gainDb} dB`;

331 gain.addEventListener("input", () => { this.gainDb = Number(gain.value); gainLabel.textContent = `${this.gainDb} dB`; this.updatePeak(); });

332 this.peakLabel = document.createElement("span");

333 this.downloadBtn = this.button("Download .wav", () => this.download());

334 const lab = (text: string, ...els: HTMLElement[]) => { const l = document.createElement("label"); l.append(text, ...els); return l; };

335 t.append(this.playBtn, this.liveBtn, this.designBtn, this.scrub, this.timeLabel, levelSel, lab("Gain", gain, gainLabel), this.peakLabel, this.downloadBtn);

336 }

337

338 private buildSpecToolbar(): void {

339 const t = $("specToolbar");

340 const sel = (opts: [string, string][], value: string, onChange: (v: string) => void) => {

341 const s = document.createElement("select");

342 for (const [v, l] of opts) { const o = document.createElement("option"); o.value = v; o.textContent = l; s.append(o); }

343 s.value = value;

344 s.addEventListener("change", () => onChange(s.value));

345 return s;

346 };

347 const lab = (text: string, ...els: HTMLElement[]) => { const l = document.createElement("label"); l.append(text, ...els); return l; };

348 const win = sel([["512", "512"], ["1024", "1024"], ["2048", "2048"], ["4096", "4096"]], "2048", (v) => this.spec.setOptions({ window: Number(v), hop: Number(v) / 8 }));

349 const maxHz = sel([["4000", "4 kHz"], ["8000", "8 kHz"], ["12000", "12 kHz"], ["16000", "16 kHz"], ["20000", "20 kHz"]], "12000", (v) => this.spec.setOptions({ maxHz: Number(v) }));

350 const db = sel([["60", "60 dB"], ["80", "80 dB"], ["100", "100 dB"]], "80", (v) => this.spec.setOptions({ dbRange: Number(v) }));

351 const log = document.createElement("input"); log.type = "checkbox";

352 log.addEventListener("change", () => this.spec.setOptions({ logFreq: log.checked }));

353 const ticks = document.createElement("input"); ticks.type = "checkbox"; ticks.checked = this.showTicks;

354 ticks.addEventListener("change", () => { this.showTicks = ticks.checked; this.updateTicks(); });

355 t.append(lab("Spectrogram window", win), lab("Max", maxHz), lab("Range", db), lab("Log frequency", log), lab("Modal frequencies", ticks));

356 }

357

358 private buildSplitter(): void {

359 const sp = $("splitter"), sb = $("sidebar");

360 const saved = localStorage.getItem("cymbalsim.sidebar");

361 if (saved) sb.style.width = saved;

362 let dragging = false;

363 sp.addEventListener("mousedown", (e) => { dragging = true; e.preventDefault(); });

364 window.addEventListener("mousemove", (e) => {

365 if (!dragging) return;

366 const w = Math.max(280, Math.min(window.innerWidth - 300, e.clientX));

367 sb.style.width = `${w}px`;

368 this.renderer.resize(); this.spec.resize();

369 });

370 window.addEventListener("mouseup", () => { if (dragging) { dragging = false; localStorage.setItem("cymbalsim.sidebar", sb.style.width); } });

371 sp.addEventListener("dblclick", () => { sb.style.width = ""; localStorage.removeItem("cymbalsim.sidebar"); this.renderer.resize(); this.spec.resize(); });

372 }

373

374 // ---------- Design ----------

375

376 private onSource(source: string): void {

377 if (this.running) return;

378 let d: Design;

379 try {

380 d = compileDesign(source);

381 } catch (e) {

382 this.editor.setStatus(e instanceof Error ? e.message : String(e), "error");

383 return;

384 }

385 this.editor.setStatus(`Compiled: ${d.name}`, "ok");

386 this.rebuildPlate(d);

387 }

388

389 private rebuildPlate(d: Design): void {

390 const p = this.form.get();

391 let plate: Plate;

392 try {

393 plate = evaluatePlate(d, p.spacing);

394 } catch (e) {

395 this.editor.setStatus(e instanceof DesignError ? e.message : String(e), "error");

396 return;

397 }

398 this.design = d;

399 this.plate = plate;

400 this.plateSpacing = p.spacing;

401 this.designGeneration++;

402 this.modes = null; this.model = null; this.sys = null;

403 this.synthesized = false;

404 this.lastContact = null;

405 this.rec = null;

406 this.spec.reset();

407 this.spec.setOptions({ fs: p.fs });

408 this.renderer.setPlate(plate);

409 this.setView("design");

410 this.updateMarkers();

411 this.updateDesignInfo();

412 this.updateNotes();

413 this.updateButtons();

9cfbfd1 Modes on demand with a cache, progress bar in the head, play rewinds from live or the end, exaggeration 1Jeremy Magland 1 month ago414 if (this.runMode === "linear") this.useCachedModes();

5778036 cymbalsim: scripted plate and cymbal designer with a modal linear model and a von Karman GPU modelJeremy Magland 1 month ago415 else this.modeBrowser.clear("Switch to the linear model to compute the modes.");

416 }

417

9cfbfd1 Modes on demand with a cache, progress bar in the head, play rewinds from live or the end, exaggeration 1Jeremy Magland 1 month ago418 /** The cache key of the modes of the current design and numerics. */

419 private modesKey(): string | null {

420 if (!this.design || !this.plate) return null;

421 const p = this.form.get();

422 return `${this.plateSpacing}|${Math.min(p.modeMaxFreq, p.fs / 2)}|${this.design.source}`;

423 }

424

425 /** Installs cached modes for the current design if there are any; otherwise leaves the browser empty. */

426 private useCachedModes(): void {

427 const key = this.modesKey();

428 const hit = key ? this.modesCache.get(key) : undefined;

429 if (hit && this.plate) {

430 this.installModes(hit.sys, hit.modes, hit.model, null);

431 if (this.pool) void this.pool.setModel(hit.model);

432 } else this.modeBrowser.clear("Press Synthesize to compute the modes of this design.");

433 }

434

435 /** Shows a mode set in the browser, the notes and the spectrogram ticks. */

436 private installModes(sys: LinearSystem, modes: ModeSet, model: ModalModel, secs: number | null): void {

437 const pl = this.plate!;

438 const p = this.form.get();

439 const fMax = Math.min(p.modeMaxFreq, p.fs / 2);

440 this.sys = sys; this.modes = modes; this.model = model;

441 const rows = Array.from(modes.freqs).map((f, m) => ({ freq: f, t60: LN1000 / Math.min(decayRate(pl.loss, f) + model.padSigma[m], 0.99 * 2 * Math.PI * f) }));

442 const kind = sys.fields === 1 ? "bending modes" : "modes (bending coupled to stretching)";

443 const when = secs === null ? "cached" : `in ${secs.toFixed(1)} s`;

444 this.modeBrowser.setModes(rows, `${modes.count} ${kind} up to ${(fMax / 1e3).toFixed(1)} kHz, ${when} (${sys.n} unknowns${modes.missing ? `, ${modes.missing} missing` : ""}). Click a mode to see its shape.`);

445 this.updateNotes();

446 this.updateTicks();

447 this.updateButtons();

448 }

449

5778036 cymbalsim: scripted plate and cymbal designer with a modal linear model and a von Karman GPU modelJeremy Magland 1 month ago450 private updateDesignInfo(): void {

451 const pl = this.plate;

452 if (!pl) return;

453 const p = this.form.get();

454 const g = pl.grid;

455 const { mass } = massProperties(pl);

456 const hr = thicknessRange(pl);

457 const ps = profileStats(pl);

458 const sr = standRates(pl);

459 const lines: string[] = [];

460 lines.push(`${pl.name}: ${(pl.Lx * 1e3).toFixed(0)} x ${(pl.Ly * 1e3).toFixed(0)} mm, E = ${(pl.mat.E / 1e9).toFixed(0)} GPa, nu = ${pl.mat.nu}, rho = ${pl.mat.rho} kg/m^3`);

461 lines.push(`Thickness ${(hr.min * 1e3).toFixed(2)} to ${(hr.max * 1e3).toFixed(2)} mm, mass ${(mass * 1e3).toFixed(0)} g, grid ${g.nx} x ${g.ny} at ${(g.hx * 1e3).toFixed(2)} mm (${countInside(g)} nodes)`);

462 if (ps.peakToPeak > 0) {

463 const warn = ps.maxSlope > 0.1 ? ` <span class="warn">(above the shallow-shell range of about 0.1)</span>` : "";

464 lines.push(`Profile ${(ps.peakToPeak * 1e3).toFixed(1)} mm peak to peak, largest slope ${ps.maxSlope.toFixed(3)}${warn}`);

465 } else lines.push("Flat plate (no profile): the linear model is bending only");

466 if (pl.stand && sr) {

467 const pad = pl.stand.pad;

468 lines.push(`Stand: ${pl.stand.topPad ? "two pads" : "bottom pad only"}, ${(pad.innerRadius * 1e3).toFixed(0)} to ${(pad.outerRadius * 1e3).toFixed(0)} mm, ${(pad.thickness * 1e3).toFixed(0)} mm felt at ${(pad.E / 1e6).toFixed(2)} MPa; ${(sr.totalKw / 1e3).toFixed(0)} kN/m, bounce ${sr.bounceHz.toFixed(0)} Hz, ${sr.nodes.length} pad nodes, preload ${(sr.preloadTop * 1e3).toFixed(2)} / ${(sr.preloadBottom * 1e3).toFixed(2)} mm`);

469 } else lines.push("Free plate (no stand)");

470 lines.push(`Decay T60: ${t60At(pl.loss, 100).toFixed(2)} s at 100 Hz, ${t60At(pl.loss, 1000).toFixed(2)} s at 1 kHz, ${t60At(pl.loss, 5000).toFixed(2)} s at 5 kHz`);

471 void p;

472 $("designInfo").innerHTML = lines.join("\n");

473 }

474

475 private updateNotes(): void {

476 const pl = this.plate;

477 if (!pl) return;

478 const p = this.form.get();

479 const g = pl.grid;

480 const hm = meanThickness(pl);

481 const f3 = dispersionFrequency(pl.mat, hm, g.hx, 0.03), f10 = dispersionFrequency(pl.mat, hm, g.hx, 0.1);

482 const wmax = maxAngularFrequency(g, pl.mat, thicknessRange(pl).max);

483 const dtMax = (CFL * 2) / wmax;

484 const sps = Math.ceil(1 / (p.fs * dtMax));

485 const dt = 1 / (p.fs * sps);

486 const fit = fitSigma(pl.loss, pl.mat, hm);

487 const t60f = (f: number) => (LN1000 / fittedRate(fit, f)).toFixed(2);

488 const lines = [

489 `Grid ${g.nx} x ${g.ny}, ${countInside(g)} plate nodes. Grid dispersion lowers the bending partials by 3% near ${(f3 / 1e3).toFixed(1)} kHz and by 10% near ${(f10 / 1e3).toFixed(1)} kHz (at the mean thickness).`,

490 `Linear model: modes up to ${(p.modeMaxFreq / 1e3).toFixed(1)} kHz${this.modes ? `, ${this.modes.count} found in ${this.modes.seconds.toFixed(1)} s` : ""}${this.modes && this.modes.missing ? ` <span class="warn">(${this.modes.missing} missing)</span>` : ""}.`,

491 `Full model: time step ${(dt * 1e6).toFixed(2)} us (${sps} per sample, in-plane wave speed ${inPlaneSpeed(pl.mat).toFixed(0)} m/s), ${((p.duration * p.fs * sps) / 1e6).toFixed(1)} million steps for ${p.duration} s. Losses fitted as sigma0 = ${fit.sigma0.toFixed(2)} 1/s, sigma1 = ${fit.sigma1.toExponential(2)} m^2/s: T60 ${t60f(100)} / ${t60f(1000)} / ${t60f(5000)} s at 100 Hz / 1 kHz / 5 kHz (requested ${t60At(pl.loss, 100).toFixed(2)} / ${t60At(pl.loss, 1000).toFixed(2)} / ${t60At(pl.loss, 5000).toFixed(2)}).`,

492 ];

493 this.form.setNotes("Grid and numerics", lines.join("\n"));

494 const patch = strikePatch(pl, p);

495 const sp = strikePoint(pl, p);

496 const sl = [`Strike at (${(sp.x * 1e3).toFixed(0)}, ${(sp.y * 1e3).toFixed(0)}) mm on ${patch.nodes.length} node${patch.nodes.length === 1 ? "" : "s"} (${(patch.mass * 1e3).toFixed(2)} g).`];

497 if (this.lastContact) sl.push(`Last linear strike: peak force ${this.lastContact.peakForce.toFixed(0)} N, contact ${(this.lastContact.contactTime * 1e3).toFixed(2)} ms.`);

498 if (this.sim) { const st = this.sim.status().stick; sl.push(`Full simulation: peak force ${st.maxForce.toFixed(0)} N${st.withdrawn ? ", stick withdrawn" : ""}.`); }

499 this.form.setNotes("Strike", sl.join("\n"));

500 }

501

502 private updateMarkers(): void {

503 const pl = this.plate;

504 if (!pl) return;

505 const p = this.form.get();

506 const sp = strikePoint(pl, p);

507 const L = listenerPosition(p);

508 this.renderer.setMarkers({

509 strike: { x: sp.x, y: sp.y, radius: p.contactRadius },

510 stand: pl.stand ? { x: pl.stand.x, y: pl.stand.y, innerRadius: pl.stand.pad.innerRadius, outerRadius: pl.stand.pad.outerRadius } : null,

511 listener: L,

512 });

513 }

514

515 // ---------- Linear model ----------

516

9cfbfd1 Modes on demand with a cache, progress bar in the head, play rewinds from live or the end, exaggeration 1Jeremy Magland 1 month ago517 /** Computes the modes of the current design unless they are cached; resolves when they are installed (or with an error). */

518 private computeModes(): Promise<void> {

519 const pl = this.plate, gen = this.designGeneration, key = this.modesKey();

520 if (!pl || !key) return Promise.resolve();

521 const hit = this.modesCache.get(key);

522 if (hit) {

523 if (this.model !== hit.model) { this.installModes(hit.sys, hit.modes, hit.model, null); if (this.pool) return this.pool.setModel(hit.model); }

524 return Promise.resolve();

525 }

5778036 cymbalsim: scripted plate and cymbal designer with a modal linear model and a von Karman GPU modelJeremy Magland 1 month ago526 const p = this.form.get();

527 const fMax = Math.min(p.modeMaxFreq, p.fs / 2);

9cfbfd1 Modes on demand with a cache, progress bar in the head, play rewinds from live or the end, exaggeration 1Jeremy Magland 1 month ago528 this.modeBrowser.clear("Computing the modes...");

529 this.setProgress(0, "Computing the modes...");

5778036 cymbalsim: scripted plate and cymbal designer with a modal linear model and a von Karman GPU modelJeremy Magland 1 month ago530 this.updateButtons();

531 this.modesBusy = this.modesBusy.then(async () => {

532 if (gen !== this.designGeneration) return;

533 const t0 = performance.now();

534 let sys: LinearSystem;

535 try {

536 sys = assemble(pl);

537 } catch (e) {

9cfbfd1 Modes on demand with a cache, progress bar in the head, play rewinds from live or the end, exaggeration 1Jeremy Magland 1 month ago538 this.setProgress(null, `Assembly failed: ${e instanceof Error ? e.message : String(e)}`);

539 throw e;

5778036 cymbalsim: scripted plate and cymbal designer with a modal linear model and a von Karman GPU modelJeremy Magland 1 month ago540 }

541 let modes: ModeSet;

542 try {

9cfbfd1 Modes on demand with a cache, progress bar in the head, play rewinds from live or the end, exaggeration 1Jeremy Magland 1 month ago543 if (this.pool) modes = await this.pool.modes(sys, fMax, (d, t) => { if (gen === this.designGeneration) this.setProgress(t ? d / t : 0, `Computing the modes: slice ${d} of ${t}`); });

5778036 cymbalsim: scripted plate and cymbal designer with a modal linear model and a von Karman GPU modelJeremy Magland 1 month ago544 else {

545 const { computeModes, localRunner } = await import("./modal/modes.ts");

546 modes = await computeModes(sys, fMax, localRunner(sys));

547 }

548 } catch (e) {

9cfbfd1 Modes on demand with a cache, progress bar in the head, play rewinds from live or the end, exaggeration 1Jeremy Magland 1 month ago549 this.setProgress(null, `Mode computation failed: ${e instanceof Error ? e.message : String(e)}`);

550 throw e;

5778036 cymbalsim: scripted plate and cymbal designer with a modal linear model and a von Karman GPU modelJeremy Magland 1 month ago551 }

9cfbfd1 Modes on demand with a cache, progress bar in the head, play rewinds from live or the end, exaggeration 1Jeremy Magland 1 month ago552 const model = modalModel(pl, sys, modes);

553 this.modesCache.set(key, { sys, modes, model });

554 while (this.modesCache.size > 4) this.modesCache.delete(this.modesCache.keys().next().value!);

555 if (gen !== this.designGeneration) { this.setProgress(null); return; }

556 if (this.pool) await this.pool.setModel(model);

557 this.setProgress(null, "");

558 this.installModes(sys, modes, model, (performance.now() - t0) / 1000);

5778036 cymbalsim: scripted plate and cymbal designer with a modal linear model and a von Karman GPU modelJeremy Magland 1 month ago559 });

9cfbfd1 Modes on demand with a cache, progress bar in the head, play rewinds from live or the end, exaggeration 1Jeremy Magland 1 month ago560 return this.modesBusy;

5778036 cymbalsim: scripted plate and cymbal designer with a modal linear model and a von Karman GPU modelJeremy Magland 1 month ago561 }

562

563 private showMode(m: number | null): void {

564 if (m === null) { this.setView(this.rec ? "movie" : "design"); return; }

565 if (!this.model) return;

566 this.view = "mode";

567 const shape = modeShapeOnGrid(this.model, m);

568 // Scale the mass-normalized shape to a visible amplitude: 1 mm peak.

569 let peak = 0;

570 for (const v of shape) peak = Math.max(peak, Math.abs(v));

571 const w = new Float32Array(shape.length);

572 for (let k = 0; k < w.length; k++) w[k] = (shape[k] / (peak || 1)) * 1e-3;

573 this.renderer.setField(w);

574 this.overlay.textContent = `Mode ${m + 1}: ${this.model.freqs[m].toFixed(1)} Hz (shape scaled to 1 mm)`;

575 }

576

577 private scheduleSynth(): void {

578 if (this.synthTimer !== null) clearTimeout(this.synthTimer);

579 this.synthTimer = window.setTimeout(() => { this.synthTimer = null; void this.runLinear(); }, 250);

580 }

581

582 /** Synthesizes the strike with the current parameters (linear model). */

583 async runLinear(): Promise<void> {

9cfbfd1 Modes on demand with a cache, progress bar in the head, play rewinds from live or the end, exaggeration 1Jeremy Magland 1 month ago584 if (!this.plate) return;

585 if (this.synthBusy) { this.synthPending = true; return; }

586 if (!this.model || this.modesKey() !== this.currentModesKey) {

587 try {

588 await this.computeModes();

589 } catch {

590 return;

591 }

592 this.currentModesKey = this.modesKey();

593 }

5778036 cymbalsim: scripted plate and cymbal designer with a modal linear model and a von Karman GPU modelJeremy Magland 1 month ago594 const pl = this.plate, model = this.model;

595 if (!pl || !model) return;

596 this.synthBusy = true;

597 const p = this.form.get();

598 const gen = this.designGeneration;

599 const t0 = performance.now();

600 this.runStatus.textContent = "Synthesizing...";

601 try {

602 let audio: Float32Array, frames: Float32Array, nFrames: number, contact: ContactResult;

603 if (this.pool) {

604 const r = await this.pool.synthesize(model, pl, pl.loss, p, (a, c) => {

605 if (gen !== this.designGeneration) return;

606 this.installRecording(a, [], p, "linear");

607 this.lastContact = c;

608 this.runStatus.textContent = `Audio ready in ${((performance.now() - t0) / 1000).toFixed(2)} s; movie frames...`;

609 });

610 audio = r.audio; frames = r.frames; nFrames = r.nFrames; contact = r.contact;

611 } else {

612 const { synthesize } = await import("./modal/synth.ts");

613 const r = synthesize(model, pl, pl.loss, p, true);

614 audio = r.audio; frames = r.frames; nFrames = r.nFrames; contact = r.contact;

615 }

616 if (gen !== this.designGeneration) return;

617 const n = pl.grid.n;

618 const frameList: Float32Array[] = [];

619 for (let f = 0; f < nFrames; f++) frameList.push(frames.subarray(f * n, (f + 1) * n));

620 this.installRecording(audio, frameList, p, "linear");

621 this.lastContact = contact;

622 this.synthesized = true;

623 const secs = (performance.now() - t0) / 1000;

624 this.runStatus.textContent = `Linear model: ${model.count} modes, ${p.duration} s synthesized in ${secs.toFixed(2)} s. Peak ${peakSpl(audio).toFixed(0)} dB SPL, contact ${(contact.contactTime * 1e3).toFixed(2)} ms, peak force ${contact.peakForce.toFixed(0)} N.`;

625 this.updateNotes();

626 } catch (e) {

627 this.runStatus.textContent = `Synthesis failed: ${e instanceof Error ? e.message : String(e)}`;

628 } finally {

629 this.synthBusy = false;

630 if (this.synthPending) { this.synthPending = false; void this.runLinear(); }

631 }

632 }

633

634 // ---------- Full simulation ----------

635

636 async runFull(): Promise<void> {

637 const pl = this.plate;

638 if (!pl || !this.device || this.running) return;

639 const p = this.form.get();

640 this.sim?.destroy();

641 const hm = meanThickness(pl);

642 const fit = fitSigma(pl.loss, pl.mat, hm);

643 const loss: FullLoss = fullLoss(fit, standRates(pl), decayRate(pl.loss, 5000));

644 this.sim = new Simulation(this.device, pl, p, loss);

645 this.rec = { audio: new Float32Array(0), samples: 0, fs: p.fs, frames: [new Float32Array(pl.grid.n)], fps: p.fps, source: "full" };

646 this.spec.reset();

647 this.spec.setOptions({ fs: p.fs });

648 this.spec.setDuration(p.duration);

649 this.running = true;

650 this.paused = false;

651 this.setLocked(true);

652 this.setView("live");

653 this.updateButtons();

654 await this.fullLoop();

655 }

656

657 private async fullLoop(): Promise<void> {

658 const sim = this.sim;

659 if (!sim) return;

660 const t0 = performance.now();

661 let lastUi = 0;

662 while (this.running && sim.phase === "recording") {

663 if (this.paused) { await new Promise((r) => setTimeout(r, 50)); continue; }

664 await sim.runBatch();

665 if (!this.rec || this.sim !== sim) break;

666 // New audio and frames.

667 const rec = this.rec;

668 const newSamples = sim.samples - rec.samples;

669 if (newSamples > 0) {

670 const chunk = sim.audio.subarray(rec.samples, sim.samples);

671 this.spec.append(chunk);

672 rec.audio = sim.audio; rec.samples = sim.samples;

673 }

674 rec.frames = sim.frames;

675 if (this.view === "live") this.renderer.setField(sim.frames[sim.frames.length - 1]);

676 const now = performance.now();

677 if (now - lastUi > 100) {

678 lastUi = now;

679 const st = sim.status();

680 const elapsed = (now - t0) / 1000;

681 this.runStatus.textContent = `Full model: t = ${st.t.toFixed(3)} s, ${(st.totalSteps / elapsed / 1000).toFixed(0)}k steps/s (${(elapsed / Math.max(st.t, 1e-3)).toFixed(0)} s per second of sound), peak ${peakSpl(sim.recordedAudio()).toFixed(0)} dB SPL, stick force ${st.stick.force.toFixed(0)} N${st.delayClamped ? ", delay spread clamped" : ""}`;

682 this.scrub.max = String(Math.max(0, rec.frames.length - 1));

683 this.updatePeak();

684 }

685 }

686 if (this.sim === sim) {

687 this.running = false;

688 this.setLocked(false);

689 const st = sim.status();

690 this.runStatus.textContent = `Full model: ${st.t.toFixed(2)} s recorded, peak ${peakSpl(sim.recordedAudio()).toFixed(0)} dB SPL, peak force ${st.stick.maxForce.toFixed(0)} N, largest displacement ${(st.wmax * 1e3).toFixed(2)} mm.`;

691 if (this.rec) { this.rec.audio = sim.recordedAudio(); this.rec.samples = sim.samples; this.rec.frames = sim.frames; }

692 this.updateNotes();

693 this.updateButtons();

694 this.updatePeak();

695 }

696 }

697

698 // ---------- Run control ----------

699

700 private setRunMode(mode: RunMode): void {

701 if (mode === "full" && !this.device) mode = "linear";

702 this.runMode = mode;

703 this.runModeSel.value = mode;

9cfbfd1 Modes on demand with a cache, progress bar in the head, play rewinds from live or the end, exaggeration 1Jeremy Magland 1 month ago704 if (mode === "linear" && this.plate && !this.modes) this.useCachedModes();

5778036 cymbalsim: scripted plate and cymbal designer with a modal linear model and a von Karman GPU modelJeremy Magland 1 month ago705 if (mode === "full") this.modeBrowser.clear("Switch to the linear model to compute the modes.");

706 this.updateButtons();

707 }

708

709 private start(): void {

710 if (this.runMode === "linear") void this.runLinear();

711 else void this.runFull();

712 }

713 private pause(): void {

714 if (!this.running) return;

715 this.paused = !this.paused;

716 this.pauseBtn.textContent = this.paused ? "Resume" : "Pause";

717 }

718 private stopRun(): void {

719 if (this.sim && this.running) { this.sim.stop(); this.running = false; }

720 this.paused = false;

721 this.pauseBtn.textContent = "Pause";

722 this.setLocked(false);

723 this.updateButtons();

724 }

725 private continueRun(): void {

726 const sim = this.sim;

727 if (!sim || this.running || !sim.canContinue()) return;

728 sim.setDuration(this.form.get().duration);

729 this.running = true;

730 this.setLocked(true);

731 this.setView("live");

732 this.updateButtons();

733 void this.fullLoop();

734 }

735

736 private setLocked(locked: boolean): void {

737 this.editor.setLocked(locked);

738 this.form.setLocked(locked);

739 this.runModeSel.disabled = locked;

740 }

741

742 private updateButtons(): void {

743 const linear = this.runMode === "linear";

9cfbfd1 Modes on demand with a cache, progress bar in the head, play rewinds from live or the end, exaggeration 1Jeremy Magland 1 month ago744 const canLinear = linear && !!this.plate && !this.synthBusy;

5778036 cymbalsim: scripted plate and cymbal designer with a modal linear model and a von Karman GPU modelJeremy Magland 1 month ago745 const canFull = !linear && !!this.plate && !!this.device && !this.running;

746 this.startBtn.disabled = !(canLinear || canFull);

747 this.startBtn.textContent = linear ? "Synthesize" : "Start";

748 this.pauseBtn.disabled = linear || !this.running;

749 this.stopBtn.disabled = linear || !this.running;

750 this.continueBtn.disabled = linear || this.running || !this.sim || !this.sim.canContinue() || this.sim.samples >= Math.round(this.form.get().duration * this.form.get().fs);

751 this.pauseBtn.hidden = linear; this.stopBtn.hidden = linear; this.continueBtn.hidden = linear;

752 this.liveBtn.hidden = linear;

753 }

754

755 // ---------- Recording, view, playback ----------

756

757 private installRecording(audio: Float32Array, frames: Float32Array[], p: SimParams, source: RunMode): void {

758 this.rec = { audio, samples: audio.length, fs: p.fs, frames, fps: p.fps, source };

759 this.spec.setOptions({ fs: p.fs });

760 this.spec.setDuration(p.duration);

761 this.spec.setSignal(audio);

762 this.scrub.max = String(Math.max(0, frames.length - 1));

763 if (frames.length > 0) {

9cfbfd1 Modes on demand with a cache, progress bar in the head, play rewinds from live or the end, exaggeration 1Jeremy Magland 1 month ago764 this.frameIndex = 0;

5778036 cymbalsim: scripted plate and cymbal designer with a modal linear model and a von Karman GPU modelJeremy Magland 1 month ago765 if (this.view !== "mode") { this.setView("movie"); this.showFrame(); }

766 }

767 this.updatePeak();

768 this.updateButtons();

769 }

770

771 private setView(v: ViewState): void {

772 this.view = v;

773 if (v === "design") { this.renderer.setField(null); this.overlay.textContent = this.plate ? "Stress-free shape" : ""; }

774 else if (v === "live") { this.overlay.textContent = "Live"; if (this.sim) this.renderer.setField(this.sim.frames[this.sim.frames.length - 1]); }

775 else if (v === "movie") this.showFrame();

776 }

777

778 private showFrame(): void {

779 const rec = this.rec;

780 if (!rec || rec.frames.length === 0) return;

781 const f = Math.max(0, Math.min(rec.frames.length - 1, this.frameIndex));

782 this.frameIndex = f;

783 this.scrub.value = String(f);

784 this.timeLabel.textContent = `${(f / rec.fps).toFixed(3)} s`;

785 this.renderer.setField(rec.frames[f]);

786 this.overlay.textContent = `${rec.source === "linear" ? "Linear" : "Full"} model, t = ${(f / rec.fps).toFixed(3)} s`;

787 }

788

789 private playable(): Float32Array | null {

790 const rec = this.rec;

791 if (!rec || rec.samples === 0) return null;

792 const sig = rec.audio.subarray(0, rec.samples);

793 return applyLevel(sig, levelGain(sig, rec.fs, this.levelMode, this.gainDb));

794 }

795

796 private updatePeak(): void {

797 const s = this.playable();

798 if (!s) { this.peakLabel.textContent = ""; this.downloadBtn.disabled = true; this.playBtn.disabled = true; return; }

799 const db = peakDbfs(s);

800 this.peakLabel.textContent = `Peak ${db.toFixed(1)} dBFS${db > -0.5 ? " (clipping)" : ""}`;

801 this.peakLabel.className = db > -0.5 ? "badge warn" : "badge";

802 this.downloadBtn.disabled = false;

803 this.playBtn.disabled = false;

804 }

805

806 private togglePlay(): void {

807 if (this.player.playing) { this.player.stop(); this.playBtn.textContent = "Play"; this.spec.setCursor(null); return; }

808 const s = this.playable(), rec = this.rec;

809 if (!s || !rec) return;

9cfbfd1 Modes on demand with a cache, progress bar in the head, play rewinds from live or the end, exaggeration 1Jeremy Magland 1 month ago810 // Play from the scrubbed position only when the user has scrubbed to one; from the live

811 // view, or from the end of the recording, start over.

812 const atEnd = rec.frames.length > 1 && this.frameIndex >= rec.frames.length - 1;

813 const start = this.view === "movie" && rec.frames.length > 1 && !atEnd ? this.frameIndex / rec.fps : 0;

5778036 cymbalsim: scripted plate and cymbal designer with a modal linear model and a von Karman GPU modelJeremy Magland 1 month ago814 this.playBtn.textContent = "Stop";

815 const prevView = this.view;

816 this.player.play(s, rec.fs, start, () => { this.playBtn.textContent = "Play"; this.spec.setCursor(null); if (prevView === "live") this.setView("live"); });

817 const tick = () => {

818 if (!this.player.playing) return;

819 const t = this.player.position();

820 this.spec.setCursor(t);

821 if (rec.frames.length > 1) { this.frameIndex = Math.round(t * rec.fps); this.view = "movie"; this.showFrame(); }

822 requestAnimationFrame(tick);

823 };

824 requestAnimationFrame(tick);

825 }

826

827 private download(): void {

828 const s = this.playable(), rec = this.rec;

829 if (!s || !rec) return;

830 const blob = encodeWav(s, rec.fs);

831 const a = document.createElement("a");

832 a.href = URL.createObjectURL(blob);

833 a.download = `${(this.plate?.name ?? "cymbalsim").replace(/[^a-z0-9]+/gi, "-").toLowerCase()}-${rec.source}.wav`;

834 a.click();

835 setTimeout(() => URL.revokeObjectURL(a.href), 1000);

836 }

837

838 private updateTicks(): void {

839 this.spec.setTicks(this.showTicks && this.modes ? Array.from(this.modes.freqs) : null);

840 }

841

842 // ---------- Tests ----------

843

844 async selfTest(): Promise<string> {

845 if (!this.device) return "no WebGPU";

846 const lines: string[] = [];

847 for (const id of ["flat-rectangle", "bowed-rectangle", "crash-16", "crash-bell-16", "ellipse"]) {

848 const pr = presetById(id)!;

849 const d = compileDesign(pr.source);

850 const pl = evaluatePlate(d, 0.012);

851 const r = await runSelfTest(this.device, pl, this.form.get());

852 lines.push(`${id}: max relative error ${r.maxRel.toExponential(2)} (${r.n} nodes)`);

853 }

854 return lines.join("\n");

855 }

856

857 private testStatus(): unknown {

858 return {

859 design: this.design?.name ?? null,

860 modes: this.modes ? { count: this.modes.count, missing: this.modes.missing, first: Array.from(this.modes.freqs.slice(0, 5)) } : null,

861 synthesized: this.synthesized,

862 running: this.running,

863 samples: this.rec?.samples ?? 0,

864 frames: this.rec?.frames.length ?? 0,

865 source: this.rec?.source ?? null,

866 peakPressure: this.rec ? Array.from(this.rec.audio.subarray(0, this.rec.samples)).reduce((m, v) => Math.max(m, Math.abs(v)), 0) : 0,

867 sim: this.sim ? this.sim.status() : null,

868 contact: this.lastContact ? { peakForce: this.lastContact.peakForce, contactTime: this.lastContact.contactTime } : null,

869 editorStatus: ($("design").querySelector(".editor-status") as HTMLElement | null)?.textContent ?? "",

870 };

871 }

872}

873

874const app = new App();

875app.init().catch((e) => {

876 console.error(e);

877 $("viewOverlay").textContent = `Failed to start: ${e instanceof Error ? e.message : String(e)}`;

878});

879

880export { app, PRESETS, isFlat, formatNumber };