diff --git a/.changeset/webgl-renderer-toggle.md b/.changeset/webgl-renderer-toggle.md
new file mode 100644
index 00000000..0e620d7a
--- /dev/null
+++ b/.changeset/webgl-renderer-toggle.md
@@ -0,0 +1,5 @@
+---
+"aicodeman": patch
+---
+
+Add a **WebGL Renderer** toggle to Settings → Appearance (desktop). WebGL stays on by default; turning it off forces the DOM renderer for users who hit GPU glitches, without needing the `?nowebgl` URL param. Turning it back on (or `?webgl=force`) clears any stale auto-fallback marker. The existing mobile skip and long-task auto-fallback safety net are unchanged. The skip decision is factored into a pure, unit-tested `shouldSkipWebGL()` helper.
diff --git a/src/web/public/constants.js b/src/web/public/constants.js
index 379b97c3..f690d086 100644
--- a/src/web/public/constants.js
+++ b/src/web/public/constants.js
@@ -111,6 +111,31 @@ function evaluateWebGLLongTaskTrip(recent, entries, now, config = WEBGL_FALLBACK
return recent.length >= config.LONGTASK_COUNT;
}
+/**
+ * Pure decision for whether to skip the WebGL renderer at terminal init, and
+ * whether to clear the auto-fallback sticky marker. Keeps the interaction
+ * between device type, URL params, the sticky marker, and the user's settings
+ * toggle in one testable place (terminal-ui.js calls this).
+ *
+ * Precedence (desktop only — mobile always skips):
+ * 1. user toggle OFF -> skip (one-shot opt-out, sticky untouched)
+ * 2. ?nowebgl -> skip (one-shot opt-out, sticky untouched)
+ * 3. user toggle ON / ?webgl=force -> enable + clear stale sticky marker
+ * 4. untouched (default on) -> respect the auto-fallback sticky marker
+ *
+ * @param {{deviceType?: string, noWebglParam?: boolean, forceParam?: boolean,
+ * stickyDisabled?: boolean, userPrefEnabled?: (boolean|undefined)}} [input]
+ * @returns {{skip: boolean, clearSticky: boolean}}
+ */
+function shouldSkipWebGL(input = {}) {
+ if (input.deviceType !== 'desktop') return { skip: true, clearSticky: false };
+ const pref = input.userPrefEnabled; // true | false | undefined (default on)
+ if (pref === false) return { skip: true, clearSticky: false };
+ if (input.noWebglParam) return { skip: true, clearSticky: false };
+ if (pref === true || input.forceParam) return { skip: false, clearSticky: true };
+ return { skip: !!input.stickyDisabled, clearSticky: false };
+}
+
// Expose for tests. `const` declarations at the top of a non-module script
// are global lexical bindings but not `window` properties, so explicit
// assignment is the test-visible API surface.
@@ -129,6 +154,7 @@ function shouldAutoWrapTabs(input) {
if (typeof window !== 'undefined') {
window.WEBGL_FALLBACK = WEBGL_FALLBACK;
window.evaluateWebGLLongTaskTrip = evaluateWebGLLongTaskTrip;
+ window.shouldSkipWebGL = shouldSkipWebGL;
window.CodemanTabOverflow = {
shouldAutoWrapTabs,
};
diff --git a/src/web/public/index.html b/src/web/public/index.html
index 90526869..b4466322 100644
--- a/src/web/public/index.html
+++ b/src/web/public/index.html
@@ -939,6 +939,13 @@
App Settings
+
+ WebGL Renderer
+
+
diff --git a/src/web/public/settings-ui.js b/src/web/public/settings-ui.js
index a4ceb53f..26232ad2 100644
--- a/src/web/public/settings-ui.js
+++ b/src/web/public/settings-ui.js
@@ -309,6 +309,11 @@ Object.assign(CodemanApp.prototype, {
document.getElementById('appSettingsShowResponseViewer').checked = settings.showResponseViewer ?? defaults.showResponseViewer ?? false;
document.getElementById('appSettingsShowAttachmentsButton').checked = settings.showAttachmentsButton ?? defaults.showAttachmentsButton ?? false;
document.getElementById('appSettingsSkin').value = settings.skin ?? defaults.skin ?? 'daylight-blue';
+ // WebGL renderer (desktop only — mobile always uses the DOM renderer, so hide
+ // the toggle there so it can't promise something that won't apply).
+ document.getElementById('appSettingsWebglRenderer').checked = settings.webglRendererEnabled ?? defaults.webglRendererEnabled ?? true;
+ const webglItem = document.getElementById('appSettingsWebglRendererItem');
+ if (webglItem) webglItem.style.display = MobileDetection.getDeviceType() === 'desktop' ? '' : 'none';
document.getElementById('appSettingsShowMonitor').checked = settings.showMonitor ?? defaults.showMonitor ?? false;
document.getElementById('appSettingsShowProjectInsights').checked = settings.showProjectInsights ?? defaults.showProjectInsights ?? false;
document.getElementById('appSettingsShowFileBrowser').checked = settings.showFileBrowser ?? defaults.showFileBrowser ?? false;
@@ -1377,6 +1382,7 @@ Object.assign(CodemanApp.prototype, {
tunnelEnabled: document.getElementById('appSettingsTunnelEnabled').checked,
localEchoEnabled: document.getElementById('appSettingsLocalEcho').checked,
cjkInputEnabled: document.getElementById('appSettingsCjkInput').checked,
+ webglRendererEnabled: document.getElementById('appSettingsWebglRenderer').checked,
extendedKeyboardBar: document.getElementById('appSettingsExtendedKeyboardBar').checked,
tabTwoRows: document.getElementById('appSettingsTabTwoRows').checked,
skin: document.getElementById('appSettingsSkin').value,
@@ -1694,6 +1700,7 @@ Object.assign(CodemanApp.prototype, {
ralphTrackerEnabled: false,
tabTwoRows: false,
cjkInputEnabled: false,
+ webglRendererEnabled: false, // mobile always uses the DOM renderer
skin: 'daylight-blue',
};
}
diff --git a/src/web/public/terminal-ui.js b/src/web/public/terminal-ui.js
index f7b10bda..f9ca9c83 100644
--- a/src/web/public/terminal-ui.js
+++ b/src/web/public/terminal-ui.js
@@ -246,9 +246,6 @@ Object.assign(CodemanApp.prototype, {
// Lazy-loaded: script downloaded only on desktop (saves 244KB on mobile).
this._webglAddon = null;
const _params = new URLSearchParams(location.search);
- if (_params.get('webgl') === 'force') {
- try { localStorage.removeItem('codeman-webgl-disabled'); } catch {}
- }
const _stickyDisabled = (() => {
try {
const raw = localStorage.getItem('codeman-webgl-disabled');
@@ -263,11 +260,23 @@ Object.assign(CodemanApp.prototype, {
return true;
} catch { return false; }
})();
- const skipWebGL =
- MobileDetection.getDeviceType() !== 'desktop' ||
- _params.has('nowebgl') ||
- _stickyDisabled;
- if (_stickyDisabled) {
+ // User's "WebGL Renderer" toggle (Settings > Appearance). undefined = untouched
+ // (desktop default on); false = explicit opt-out; true = explicit opt-in.
+ const _webglSettings = this.loadAppSettingsFromStorage();
+ const _webglDefaults = this.getDefaultSettings();
+ const _webglPref = _webglSettings.webglRendererEnabled ?? _webglDefaults.webglRendererEnabled;
+ const { skip: skipWebGL, clearSticky: _clearWebglSticky } = shouldSkipWebGL({
+ deviceType: MobileDetection.getDeviceType(),
+ noWebglParam: _params.has('nowebgl'),
+ forceParam: _params.get('webgl') === 'force',
+ stickyDisabled: _stickyDisabled,
+ userPrefEnabled: _webglPref,
+ });
+ // Explicit opt-in (toggle ON) or ?webgl=force retires a stale auto-fallback marker.
+ if (_clearWebglSticky) {
+ try { localStorage.removeItem('codeman-webgl-disabled'); } catch {}
+ }
+ if (skipWebGL && _stickyDisabled) {
console.log('[CRASH-DIAG] WebGL sticky-disabled from prior stalls — DOM renderer in use. Re-enable: ?webgl=force');
}
if (!skipWebGL) {
diff --git a/test/webgl-fallback.test.ts b/test/webgl-fallback.test.ts
index e6d376d8..23b6b4cc 100644
--- a/test/webgl-fallback.test.ts
+++ b/test/webgl-fallback.test.ts
@@ -215,4 +215,80 @@ describe('WebGL longtask auto-fallback', () => {
expect(result).toBeNull();
});
});
+
+ describe('shouldSkipWebGL — renderer toggle + fallback precedence', () => {
+ type Input = {
+ deviceType?: string;
+ noWebglParam?: boolean;
+ forceParam?: boolean;
+ stickyDisabled?: boolean;
+ userPrefEnabled?: boolean;
+ };
+ const run = async (input: Input): Promise<{ skip: boolean; clearSticky: boolean }> =>
+ page.evaluate(
+ (i) =>
+ (
+ window as unknown as {
+ shouldSkipWebGL: (x: unknown) => { skip: boolean; clearSticky: boolean };
+ }
+ ).shouldSkipWebGL(i),
+ input
+ );
+
+ it('exposes shouldSkipWebGL on window', async () => {
+ const t = await page.evaluate(
+ () => typeof (window as unknown as { shouldSkipWebGL?: unknown }).shouldSkipWebGL
+ );
+ expect(t).toBe('function');
+ });
+
+ it('mobile always skips, even when the user opted in', async () => {
+ expect(await run({ deviceType: 'mobile', userPrefEnabled: true })).toEqual({
+ skip: true,
+ clearSticky: false,
+ });
+ });
+
+ it('explicit opt-out skips without touching the sticky marker', async () => {
+ expect(await run({ deviceType: 'desktop', userPrefEnabled: false, stickyDisabled: false })).toEqual({
+ skip: true,
+ clearSticky: false,
+ });
+ });
+
+ it('?nowebgl is a one-shot opt-out (sticky untouched)', async () => {
+ expect(await run({ deviceType: 'desktop', noWebglParam: true })).toEqual({
+ skip: true,
+ clearSticky: false,
+ });
+ });
+
+ it('explicit opt-in enables and clears a stale sticky marker', async () => {
+ expect(await run({ deviceType: 'desktop', userPrefEnabled: true, stickyDisabled: true })).toEqual({
+ skip: false,
+ clearSticky: true,
+ });
+ });
+
+ it('?webgl=force enables and clears the sticky marker', async () => {
+ expect(await run({ deviceType: 'desktop', forceParam: true, stickyDisabled: true })).toEqual({
+ skip: false,
+ clearSticky: true,
+ });
+ });
+
+ it('untouched default respects an active sticky marker', async () => {
+ expect(await run({ deviceType: 'desktop', stickyDisabled: true })).toEqual({
+ skip: true,
+ clearSticky: false,
+ });
+ });
+
+ it('untouched default enables WebGL when nothing is disabling it', async () => {
+ expect(await run({ deviceType: 'desktop', stickyDisabled: false })).toEqual({
+ skip: false,
+ clearSticky: false,
+ });
+ });
+ });
});