src/main.ts at c99922dcd962ac45cae42709a71767e6d2edc657

proof-of-concept / cymbalsim

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1// 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";

39import { Tutorial } from "./tutorial/tutorial.ts";

40import { type Memo, type TutorialContext, type TutorialHost } from "./tutorial/steps.ts";

42type RunMode = "linear" | "full";

43type ViewState = "design" | "mode" | "live" | "movie";

45const $ = <T extends HTMLElement>(id: string): T => document.getElementById(id) as T;

47/** Peak level [dBFS] from which a recording is considered loud enough to warn before playing. */

48const LOUD_DBFS = -6;

49/** A recording louder than the accepted level by this much prompts again [dB]. */

50const LOUD_STEP_DB = 3;

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

53interface Recording {

54 audio: Float32Array;

55 samples: number;

56 fs: number;

57 frames: Float32Array[];

58 fps: number;

59 source: RunMode;

60}

62class App {

63 // GPU

64 device: GPUDevice | null = null;

65 // Design and plate

66 design: Design | null = null;

67 plate: Plate | null = null;

68 plateSpacing = 0;

69 designGeneration = 0;

70 // Linear model

71 pool: WorkerPool | null = null;

72 sys: LinearSystem | null = null;

73 modes: ModeSet | null = null;

74 model: ModalModel | null = null;

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

76 /** Modes of recent designs, keyed by the script, the spacing and the cutoff; the newest entry is last. */

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

78 headProgress!: HTMLDivElement;

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

80 currentModesKey: string | null = null;

81 headProgressBar!: HTMLDivElement;

82 synthBusy = false;

83 synthPending = false;

84 synthesized = false;

85 lastContact: ContactResult | null = null;

86 // Full simulation

87 sim: Simulation | null = null;

88 running = false;

89 paused = false;

90 // Recording and view

91 rec: Recording | null = null;

92 view: ViewState = "design";

93 frameIndex = 0;

94 runMode: RunMode = "linear";

95 // UI

96 editor!: DesignEditor;

97 form!: ParamForm;

98 modeBrowser!: ModeBrowser;

99 renderer!: PlateRenderer;

100 spec!: Spectrogram;

101 tutorial: Tutorial | null = null;

102 tutorialMemo: Memo = {};

103 specOpts = { window: 2048, logFreq: false };

104 specWinSel!: HTMLSelectElement;

105 specLogChk!: HTMLInputElement;

106 colorSel!: HTMLSelectElement;

107 player = new Player();

108 levelMode: LevelMode = "absolute";

109 gainDb = -40;

110 showTicks = true;

111 viewOpts = { mode: "3d" as ViewMode, color: "height" as ColorMode, showProfile: true, exaggeration: 1, range: 0 };

112 // Controls

113 runModeSel!: HTMLSelectElement;

114 durationInput!: HTMLInputElement;

115 startBtn!: HTMLButtonElement;

116 pauseBtn!: HTMLButtonElement;

117 stopBtn!: HTMLButtonElement;

118 continueBtn!: HTMLButtonElement;

119 runStatus!: HTMLDivElement;

120 scrub!: HTMLInputElement;

121 timeLabel!: HTMLSpanElement;

122 playBtn!: HTMLButtonElement;

123 liveBtn!: HTMLButtonElement;

124 designBtn!: HTMLButtonElement;

125 peakLabel!: HTMLSpanElement;

126 downloadBtn!: HTMLButtonElement;

127 overlay!: HTMLDivElement;

128 synthTimer: number | null = null;

129 // Loudness warning

130 loudWarn!: HTMLDivElement;

131 loudWarnText!: HTMLSpanElement;

132 loudPlayBtn!: HTMLButtonElement;

133 loudGo: (() => void) | null = null;

134 /** The highest peak level [dBFS] the user has agreed to play; louder signals prompt again. */

135 acceptedPeakDb = -Infinity;

136

137 async init(): Promise<void> {

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

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

140 try {

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

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

143 } catch (e) {

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

145 }

146 }

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

148

149 this.buildControls();

150 this.buildForm();

151 this.buildViewToolbar();

152 this.buildMovieToolbar();

153 this.buildSpecToolbar();

154 this.buildSplitter();

155

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

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

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

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

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

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

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

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

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

165 this.tutorial = new Tutorial($("tutorial"), this.tutorialHost(), (open) => {

166 $("tutorialBtn").classList.toggle("active", open);

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

168 });

169 $("tutorialBtn").addEventListener("click", () => this.tutorial?.toggle());

170

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

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

173 // The parameters come first, so that the preset is evaluated at the requested spacing.

174 this.form.applyUrl(url);

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

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

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

178 // The tutorial opens on request (?tutorial=1 or ?tutorial=<step id>) or when it was open last time.

179 const tut = url.get("tutorial");

180 if (tut !== null) this.tutorial.open(tut === "1" || tut === "" ? undefined : tut);

181 else if (this.tutorial.wasOpen()) this.tutorial.open();

182

183 const loop = () => {

184 this.renderer.render();

185 requestAnimationFrame(loop);

186 };

187 requestAnimationFrame(loop);

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

189 this.renderer.resize();

190 this.spec.resize();

191

192 // Test hooks.

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

194 app: this,

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

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

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

198 modesReady: () => this.modesBusy,

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

200 tutorial: this.tutorial,

201 };

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

203 const r = await this.selfTest();

204 this.overlay.textContent = r;

205 }

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

207 await this.modesBusy;

208 this.start();

209 }

210 }

211

212 // ---------- Controls ----------

213

214 private buildControls(): void {

215 const c = $("controls");

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

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

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

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

220 durLabel.textContent = "Duration";

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

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

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

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

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

226 this.spec.setDuration(d);

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

228 this.updateButtons();

229 });

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

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

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

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

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

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

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

237 this.headProgress = document.createElement("div");

238 this.headProgress.className = "progress";

239 this.headProgress.hidden = true;

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

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

242 this.runStatus = document.createElement("div");

243 this.runStatus.className = "status";

244 $("sidebarHead").append(this.headProgress, this.runStatus);

245 }

246

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

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

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

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

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

252 }

253

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

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

256 b.textContent = label;

257 if (cls) b.className = cls;

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

259 return b;

260 }

261

262 private buildForm(): void {

263 this.form = new ParamForm(

264 $("params"),

265 [

266 {

267 title: "Strike",

268 notes: true,

269 fields: [

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

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

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

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

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

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

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

277 ],

278 },

279 {

280 title: "Listener",

281 fields: [

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

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

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

285 ],

286 },

287 {

288 title: "Grid and numerics",

289 notes: true,

290 fields: [

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

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

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

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

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

296 ],

297 },

298 ],

299 defaultParams,

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

301 );

302 }

303

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

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

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

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

308 return;

309 }

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

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

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

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

314 this.updateMarkers();

315 this.updateNotes();

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

317 }

318 this.tutorial?.refresh();

319 }

320

321 private buildViewToolbar(): void {

322 const t = $("viewToolbar");

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

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

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

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

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

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

329 this.colorSel = colorSel;

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

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

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

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

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

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

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

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

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

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

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

341 if (!this.device) {

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

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

344 t.append(w);

345 }

346 }

347

348 private buildMovieToolbar(): void {

349 const t = $("movieToolbar");

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

369 // The loudness warning, shown in place of playing when the signal peaks near full scale.

370 this.loudWarn = document.createElement("div");

371 this.loudWarn.className = "loud-warn";

372 this.loudWarn.hidden = true;

373 this.loudWarnText = document.createElement("span");

374 this.loudPlayBtn = this.button("Play anyway", () => { const go = this.loudGo; this.hideLoudWarning(); go?.(); });

375 const cancel = this.button("Cancel", () => this.hideLoudWarning());

376 this.loudWarn.append(this.loudWarnText, this.loudPlayBtn, cancel);

377 t.append(this.loudWarn);

378 }

379

380 /** Shows the loudness warning; `go` starts the playback if the user accepts. */

381 private showLoudWarning(peakDb: number, go: () => void): void {

382 this.loudGo = go;

383 this.loudWarnText.textContent = `This recording peaks at ${peakDb.toFixed(1)} dBFS, loud enough to hurt in headphones. Turn your volume down before playing.`;

384 this.loudWarn.hidden = false;

385 this.loudPlayBtn.focus();

386 }

387

388 private hideLoudWarning(): void {

389 this.loudWarn.hidden = true;

390 this.loudGo = null;

391 }

392

393 private buildSpecToolbar(): void {

394 const t = $("specToolbar");

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

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

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

398 s.value = value;

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

400 return s;

401 };

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

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

404 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) }));

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

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

407 log.addEventListener("change", () => { this.specOpts.logFreq = log.checked; this.spec.setOptions({ logFreq: log.checked }); this.tutorial?.refresh(); });

408 this.specWinSel = win; this.specLogChk = log;

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

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

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

412 }

413

414 private buildSplitter(): void {

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

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

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

418 let dragging = false;

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

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

421 if (!dragging) return;

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

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

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

425 });

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

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

428 }

429

430 // ---------- Design ----------

431

432 private onSource(source: string): void {

433 if (this.running) return;

434 let d: Design;

435 try {

436 d = compileDesign(source);

437 } catch (e) {

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

439 return;

440 }

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

442 this.rebuildPlate(d);

443 }

444

445 private rebuildPlate(d: Design): void {

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

447 let plate: Plate;

448 try {

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

450 } catch (e) {

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

452 return;

453 }

454 this.design = d;

455 this.plate = plate;

456 this.plateSpacing = p.spacing;

457 this.designGeneration++;

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

459 this.synthesized = false;

460 this.lastContact = null;

461 this.rec = null;

462 this.spec.reset();

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

464 this.renderer.setPlate(plate);

465 this.setView("design");

466 this.updateMarkers();

467 this.updateDesignInfo();

468 this.updateNotes();

469 this.updateButtons();

470 if (this.runMode === "linear") this.useCachedModes();

471 else this.modeBrowser.clear("Switch to the linear model to compute the modes.");

472 this.tutorial?.refresh();

473 }

474

475 /** The cache key of the modes of the current design and numerics. */

476 private modesKey(): string | null {

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

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

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

480 }

481

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

483 private useCachedModes(): void {

484 const key = this.modesKey();

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

486 if (hit && this.plate) {

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

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

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

490 }

491

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

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

494 const pl = this.plate!;

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

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

497 this.sys = sys; this.modes = modes; this.model = model;

498 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) }));

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

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

501 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.`);

502 this.updateNotes();

503 this.updateTicks();

504 this.updateButtons();

505 this.tutorial?.refresh();

506 }

507

508 private updateDesignInfo(): void {

509 const pl = this.plate;

510 if (!pl) return;

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

512 const g = pl.grid;

513 const { mass } = massProperties(pl);

514 const hr = thicknessRange(pl);

515 const ps = profileStats(pl);

516 const sr = standRates(pl);

517 const lines: string[] = [];

518 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`);

519 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)`);

520 if (ps.peakToPeak > 0) {

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

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

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

524 if (pl.stand && sr) {

525 const pad = pl.stand.pad;

526 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`);

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

528 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`);

529 void p;

530 $("designInfo").innerHTML = lines.join("\n");

531 }

532

533 private updateNotes(): void {

534 const pl = this.plate;

535 if (!pl) return;

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

537 const g = pl.grid;

538 const hm = meanThickness(pl);

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

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

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

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

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

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

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

546 const lines = [

547 `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).`,

548 `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>` : ""}.`,

549 `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)}).`,

550 ];

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

552 const patch = strikePatch(pl, p);

553 const sp = strikePoint(pl, p);

554 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).`];

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

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

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

558 }

559

560 private updateMarkers(): void {

561 const pl = this.plate;

562 if (!pl) return;

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

564 const sp = strikePoint(pl, p);

565 const L = listenerPosition(p);

566 this.renderer.setMarkers({

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

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

569 listener: L,

570 });

571 }

572

573 // ---------- Linear model ----------

574

575 /** Computes the modes of the current design unless they are cached; resolves when they are installed (or with an error). */

576 private computeModes(): Promise<void> {

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

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

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

580 if (hit) {

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

582 return Promise.resolve();

583 }

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

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

586 this.modeBrowser.clear("Computing the modes...");

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

588 this.updateButtons();

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

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

591 const t0 = performance.now();

592 let sys: LinearSystem;

593 try {

594 sys = assemble(pl);

595 } catch (e) {

596 this.setProgress(null, `Assembly failed: ${e instanceof Error ? e.message : String(e)}`);

597 throw e;

598 }

599 let modes: ModeSet;

600 try {

601 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}`); });

602 else {

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

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

605 }

606 } catch (e) {

607 this.setProgress(null, `Mode computation failed: ${e instanceof Error ? e.message : String(e)}`);

608 throw e;

609 }

610 const model = modalModel(pl, sys, modes);

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

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

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

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

615 this.setProgress(null, "");

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

617 });

618 return this.modesBusy;

619 }

620

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

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

623 if (!this.model) return;

624 this.view = "mode";

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

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

627 let peak = 0;

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

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

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

631 this.renderer.setField(w);

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

633 }

634

635 private scheduleSynth(): void {

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

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

638 }

639

640 /** Makes sure the modes of the current design are computed and installed in the pool. */

641 async ensureModes(): Promise<void> {

642 if (!this.plate) return;

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

644 await this.computeModes();

645 this.currentModesKey = this.modesKey();

646 }

647 }

648

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

650 async runLinear(): Promise<void> {

651 if (!this.plate) return;

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

653 try {

654 await this.ensureModes();

655 } catch {

656 return;

657 }

658 const pl = this.plate, model = this.model;

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

660 this.synthBusy = true;

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

662 const gen = this.designGeneration;

663 const t0 = performance.now();

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

665 try {

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

667 if (this.pool) {

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

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

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

671 this.lastContact = c;

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

673 });

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

675 } else {

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

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

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

679 }

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

681 const n = pl.grid.n;

682 const frameList: Float32Array[] = [];

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

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

685 this.lastContact = contact;

686 this.synthesized = true;

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

688 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.`;

689 this.updateNotes();

690 } catch (e) {

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

692 } finally {

693 this.synthBusy = false;

694 this.tutorial?.refresh();

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

696 }

697 }

698

699 // ---------- Full simulation ----------

700

701 async runFull(): Promise<void> {

702 const pl = this.plate;

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

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

705 this.sim?.destroy();

706 const hm = meanThickness(pl);

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

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

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

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

711 this.spec.reset();

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

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

714 this.running = true;

715 this.paused = false;

716 this.setLocked(true);

717 this.setView("live");

718 this.updateButtons();

719 await this.fullLoop();

720 }

721

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

723 const sim = this.sim;

724 if (!sim) return;

725 const t0 = performance.now();

726 let lastUi = 0;

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

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

729 await sim.runBatch();

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

731 // New audio and frames.

732 const rec = this.rec;

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

734 if (newSamples > 0) {

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

736 this.spec.append(chunk);

737 rec.audio = sim.audio; rec.samples = sim.samples;

738 }

739 rec.frames = sim.frames;

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

741 const now = performance.now();

742 if (now - lastUi > 100) {

743 lastUi = now;

744 const st = sim.status();

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

746 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" : ""}`;

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

748 this.updatePeak();

749 }

750 }

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

752 this.running = false;

753 this.setLocked(false);

754 const st = sim.status();

755 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.`;

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

757 this.updateNotes();

758 this.updateButtons();

759 this.updatePeak();

760 this.tutorial?.refresh();

761 }

762 }

763

764 // ---------- Run control ----------

765

766 private setRunMode(mode: RunMode): void {

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

768 this.runMode = mode;

769 this.runModeSel.value = mode;

770 if (mode === "linear" && this.plate && !this.modes) this.useCachedModes();

771 if (mode === "full") this.modeBrowser.clear("Switch to the linear model to compute the modes.");

772 this.updateButtons();

773 this.tutorial?.refresh();

774 }

775

776 private start(): void {

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

778 else void this.runFull();

779 }

780 private pause(): void {

781 if (!this.running) return;

782 this.paused = !this.paused;

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

784 }

785 private stopRun(): void {

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

787 this.paused = false;

788 this.pauseBtn.textContent = "Pause";

789 this.setLocked(false);

790 this.updateButtons();

791 }

792 private continueRun(): void {

793 const sim = this.sim;

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

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

796 this.running = true;

797 this.setLocked(true);

798 this.setView("live");

799 this.updateButtons();

800 void this.fullLoop();

801 }

802

803 private setLocked(locked: boolean): void {

804 this.editor.setLocked(locked);

805 this.form.setLocked(locked);

806 this.runModeSel.disabled = locked;

807 }

808

809 private updateButtons(): void {

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

811 const canLinear = linear && !!this.plate && !this.synthBusy;

812 const canFull = !linear && !!this.plate && !!this.device && !this.running;

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

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

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

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

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

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

819 this.liveBtn.hidden = linear;

820 }

821

822 // ---------- Recording, view, playback ----------

823

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

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

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

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

828 this.spec.setSignal(audio);

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

830 if (frames.length > 0) {

831 this.frameIndex = 0;

832 if (this.view !== "mode") { this.setView("movie"); this.showFrame(); }

833 }

834 this.updatePeak();

835 this.updateButtons();

836 }

837

838 private setView(v: ViewState): void {

839 this.view = v;

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

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

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

843 }

844

845 private showFrame(): void {

846 const rec = this.rec;

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

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

849 this.frameIndex = f;

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

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

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

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

854 }

855

856 private playable(): Float32Array | null {

857 const rec = this.rec;

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

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

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

861 }

862

863 private updatePeak(): void {

864 this.hideLoudWarning();

865 const s = this.playable();

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

867 const db = peakDbfs(s);

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

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

870 this.downloadBtn.disabled = false;

871 this.playBtn.disabled = false;

872 }

873

874 private togglePlay(): void {

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

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

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

878 // A signal that peaks near full scale can hurt in headphones: warn before the first

879 // playback at such a level, and again whenever the level is well above the one accepted.

880 const peak = peakDbfs(s);

881 if (peak >= LOUD_DBFS && peak > this.acceptedPeakDb + LOUD_STEP_DB) {

882 this.showLoudWarning(peak, () => { this.acceptedPeakDb = peak; this.startPlayback(s, rec); });

883 return;

884 }

885 this.hideLoudWarning();

886 this.startPlayback(s, rec);

887 }

888

889 private startPlayback(s: Float32Array, rec: Recording): void {

890 // Play from the scrubbed position only when the user has scrubbed to one; from the live

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

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

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

894 this.playBtn.textContent = "Stop";

895 const prevView = this.view;

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

897 const tick = () => {

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

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

900 this.spec.setCursor(t);

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

902 requestAnimationFrame(tick);

903 };

904 requestAnimationFrame(tick);

905 }

906

907 private download(): void {

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

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

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

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

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

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

914 a.click();

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

916 }

917

918 private updateTicks(): void {

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

920 }

921

922 // ---------- Tutorial ----------

923

924 /** The state the tutorial's pages read. */

925 private tutorialContext(): TutorialContext {

926 const rec = this.rec;

927 const st = this.sim ? this.sim.status() : null;

928 return {

929 plate: this.plate,

930 design: this.design,

931 params: this.form.get(),

932 spacing: this.plateSpacing,

933 sys: this.sys,

934 modes: this.modes,

935 model: this.model,

936 lastContact: this.lastContact,

937 recording: rec && rec.samples > 0 ? { source: rec.source, seconds: rec.samples / rec.fs } : null,

938 full: st && st.totalSteps > 0 ? { peakForce: st.stick.maxForce, wmax: st.wmax, t: st.t, done: st.phase === "done" } : null,

939 gpu: this.device !== null,

940 runMode: this.runMode,

941 spectrogram: { ...this.specOpts },

942 memo: this.tutorialMemo,

943 };

944 }

945

946 /** The actions the tutorial's pages can take. */

947 private tutorialHost(): TutorialHost {

948 return {

949 ctx: () => this.tutorialContext(),

950 loadPreset: async (id) => { this.editor.selectPreset(id); },

951 loadScript: async (src) => { this.editor.setSource(src); this.onSource(src); },

952 setParam: (key, value) => {

953 if (key === "duration") {

954 this.durationInput.value = String(value);

955 this.durationInput.dispatchEvent(new Event("change"));

956 return;

957 }

958 this.form.set(key, value);

959 this.onParam(key, false);

960 },

961 computeModes: () => this.ensureModes(),

962 showMode: (m) => this.modeBrowser.select(m),

963 synthesize: async () => {

964 if (this.runMode !== "linear") this.setRunMode("linear");

965 await this.runLinear();

966 },

967 play: () => { if (!this.player.playing) this.togglePlay(); },

968 setRunMode: (mode) => this.setRunMode(mode),

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

970 setSpectrogram: (o) => {

971 if (o.window !== undefined) { this.specOpts.window = o.window; this.specWinSel.value = String(o.window); this.spec.setOptions({ window: o.window, hop: o.window / 8 }); }

972 if (o.logFreq !== undefined) { this.specOpts.logFreq = o.logFreq; this.specLogChk.checked = o.logFreq; this.spec.setOptions({ logFreq: o.logFreq }); }

973 this.tutorial?.refresh();

974 },

975 setViewOptions: (o) => {

976 if (o.color !== undefined) { this.viewOpts.color = o.color; this.colorSel.value = o.color; }

977 if (o.exaggeration !== undefined) this.viewOpts.exaggeration = o.exaggeration;

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

979 },

980 };

981 }

982

983 // ---------- Tests ----------

984

985 async selfTest(): Promise<string> {

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

987 const lines: string[] = [];

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

989 const pr = presetById(id)!;

990 const d = compileDesign(pr.source);

991 const pl = evaluatePlate(d, 0.012);

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

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

994 }

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

996 }

997

998 private testStatus(): unknown {

999 return {

1000 design: this.design?.name ?? null,

1001 modes: this.modes ? { count: this.modes.count, missing: this.modes.missing, first: Array.from(this.modes.freqs.slice(0, 5)) } : null,

1002 synthesized: this.synthesized,

1003 running: this.running,

1004 samples: this.rec?.samples ?? 0,

1005 frames: this.rec?.frames.length ?? 0,

1006 source: this.rec?.source ?? null,

1007 peakPressure: this.rec ? Array.from(this.rec.audio.subarray(0, this.rec.samples)).reduce((m, v) => Math.max(m, Math.abs(v)), 0) : 0,

1008 sim: this.sim ? this.sim.status() : null,

1009 contact: this.lastContact ? { peakForce: this.lastContact.peakForce, contactTime: this.lastContact.contactTime } : null,

1010 editorStatus: ($("design").querySelector(".editor-status") as HTMLElement | null)?.textContent ?? "",

1011 };

1012 }

1013}

1014

1015const app = new App();

1016app.init().catch((e) => {

1017 console.error(e);

1018 $("viewOverlay").textContent = `Failed to start: ${e instanceof Error ? e.message : String(e)}`;

1019});

1020

1021export { app, PRESETS, isFlat, formatNumber };