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Every built-in theme ships a matching scenic backdrop that paints behind the app. Main canvas fills re-derive from the theme's solid colors at partial alpha so the interface reads as tinted glass over the scene, and nested bg-background containers stop re-painting so the glass stays one layer. Pick the scene in Settings > Appearance: Theme scene follows the active theme, a specific scene sticks across theme changes, None turns it off. Dark mode keeps the scene subtle to preserve text contrast.
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ApprovabilityVerdict: Not approved Macroscope's review found this PR not approvable — This PR adds a default-on scenic background system that changes global rendering, theme surfaces, and browser-chrome synchronization across web and desktop. An unresolved Medium-severity finding also identifies stale inline colors when the scene or transparency changes. Not approved because:
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Repository: pingdotgg/t3code/.coderabbit.yaml Review profile: CHILL Plan: Advanced Run ID: 📒 Files selected for processing (8)
Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review. 📝 WalkthroughWalkthroughThe change adds persisted background-scene and transparency settings. It synchronizes scenes with the active theme, renders translucent interface surfaces over the scene, and documents the settings. ChangesTheme background scenes
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant SettingsPanel
participant ClientSettings
participant ThemeBackgroundSync
participant useTheme
participant applyThemeBackground
participant BrowserDocument
SettingsPanel->>ClientSettings: update themeBackground or themeBackgroundTransparency
ClientSettings-->>ThemeBackgroundSync: provide setting values
ThemeBackgroundSync->>useTheme: read active theme values
ThemeBackgroundSync->>applyThemeBackground: resolve and apply scene
applyThemeBackground->>BrowserDocument: update backdrop state and CSS properties
BrowserDocument-->>BrowserDocument: render scene beneath interface surfaces
Suggested reviewers: Merge Risk: ⚪ Minimal · up to No actionable merge-blocking risk remains from the reviewed change. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 37.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 8 files. (1 skipped: 1 unsupported.)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 2
- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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Inline comments:
In `@apps/web/src/routes/__root.tsx`:
- Around line 298-309: Update ThemeBackgroundSync to use the reactive
themeHalves value returned by useTheme instead of readThemeHalves when calling
resolveThemeHalf, and include themeHalves in the effect dependencies so scene
and tint updates rerun after setThemeHalf changes.
In `@apps/web/src/themeBackground.ts`:
- Line 71: Update applyThemeBackground so the no-url path removes the document
body’s inline background-color property before returning, while preserving the
existing behavior for valid URLs.
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📒 Files selected for processing (15)
apps/web/public/backgrounds/ember.webpapps/web/public/backgrounds/grove.webpapps/web/public/backgrounds/iris.webpapps/web/public/backgrounds/ocean.webpapps/web/public/backgrounds/t3-chat.webpapps/web/src/components/settings/SettingsPanels.tsxapps/web/src/components/settings/settingsSearch.tsapps/web/src/hooks/useTheme.tsapps/web/src/index.cssapps/web/src/routes/__root.tsxapps/web/src/themeBackground.test.tsapps/web/src/themeBackground.tsdocs/user/appearance.mdpackages/contracts/src/settings.test.tspackages/contracts/src/settings.ts
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…a scene turns off Review follow-up: ThemeBackgroundSync now consumes themeHalves from useTheme so swapping the light/dark half re-derives the scene and tints, and clearing a scene resets the body's inline background so the stylesheet fill takes over again.
A themeBackgroundTransparency setting (0-100%, default 20) drives the surface alpha over the scene via --backdrop-transparency, next to the scene picker in Settings > Appearance. The per-appearance dim veil stays theme-tuned so text contrast is preserved.
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| const definition = getThemeDefinition(resolveThemeHalf(theme, themeHalves, resolvedTheme)); | ||
| applyThemeBackground( |
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🟡 Medium routes/__root.tsx:305
Changing themeBackgroundTransparency leaves the inline <html> backgroundColor at its previous opacity, so the root canvas and browser chrome ignore the new transparency. Likewise, toggling a scene calls applyThemeBackground without syncBrowserChromeTheme, leaving the old opaque inline color above the scene and potentially hiding it. Resynchronize browser chrome whenever the background or transparency changes.
🤖 Copy this AI Prompt to have your agent fix this:
In file @apps/web/src/routes/__root.tsx around line 305:
Changing `themeBackgroundTransparency` leaves the inline `<html>` `backgroundColor` at its previous opacity, so the root canvas and browser chrome ignore the new transparency. Likewise, toggling a scene calls `applyThemeBackground` without `syncBrowserChromeTheme`, leaving the old opaque inline color above the scene and potentially hiding it. Resynchronize browser chrome whenever the background or transparency changes.
Review follow-up: with a scene active, chrome sync now uses the scene's solid canvas tint instead of the translucent glass fills, so the window frame and theme-color meta stay opaque and stable across scene and transparency changes.
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The scenes were regenerated against a measured framing spec: horizon at 35-45% of height so the landscape lands in the open window area, quiet left quarter behind the thread list, smooth top strip behind the toolbar, focal detail near the right margin, and quiet lower third under the composer. In-app review showed 30% transparency makes the scene clearly present without costing text readability, so the default moves from 20% to 30%.
The framing-optimized regeneration traded away the atmosphere that made the first set work; the original misty scenes win. The transparency slider stays for anyone who wants more of the scene.
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Problem
T3 Code's themes set colors, but the workspace is always a flat opaque surface. Bambooed-style
apps show that a calm scene behind a translucent interface makes long sessions feel noticeably
less sterile, and our glass utilities (
surface-glass, the glass-opacity setting) already existbut have nothing scenic behind them to show through.
Change
Every built-in theme ships a matching scenic backdrop (
apps/web/public/backgrounds/, one webpper theme, generated with image generation and compressed to 23-125 KB each). When a scene is
active, a fixed dimmed image paints under every surface, and the main canvas fills re-derive
from the theme's solid colors at partial alpha, so the interface reads as tinted glass over the
scene:
themeBackgroundclient setting (auto/none/ a built-in theme id) lands inpackages/contracts.Theme scenefollows the active theme, a picked scene sticks acrosstheme changes,
Noneturns the backdrop off.through the interface; the per-appearance dim veil stays theme-tuned for text contrast.
texture; both were rejected in review in favor of the original soft, misty scenes, which
read better behind the glass. The transparency slider lets each user find their own balance.
body::beforeunder all content; large surfaces get nobackdrop-filter(one blurred layer that big repaints on every streaming frame). The scenesare generated softly defocused instead.
bg-backgroundcontainers stop re-painting while a scene is active, so the glass staysa single layer instead of stacking into opacity.
the dark palettes is preserved.
Mobile is untouched: it renders its own theme system and palette, and the backdrop piggybacks on
the web theme pipeline. Desktop picks this up automatically since it wraps the web client.
Evidence
Before/after captures of the running client (same workspace, same threads, same viewport;
"before" is the candidate with the scene set to None, which renders the identical base path).
Evidence is hosted on a dedicated
pr-evidence/12897branch of the fork so it stays out of thisPR's diff; the branch can be deleted on merge.
Before: scene off, the current flat workspace.
After: Ocean theme — the lake scene reads through the interface as tinted glass, sidebar and
composer included.
After: T3 Chat theme — the rose-garden scene matches the palette.
After: Ember theme — warm dusk scene.
After: Grove theme in dark mode — the scene stays deliberately subtle to protect text contrast
on dark palettes.
The setting lives in Settings → Appearance, with a transparency slider under the picker:
The slider is live: at 60% transparency the scene shows through much more strongly.
Known limits, visible in the captures: the thread shown is an empty draft, so the captures prove
sidebar, header, and composer readability but not message text over a scene; secondary metadata
(branch labels, timestamps) has less contrast than before, most noticeably in Grove dark.
Verification
vp test run apps/web/src/themeBackground.test.ts packages/contracts/src/settings.test.ts apps/web/src/components/settings/settingsSearch.test.ts apps/web/src/hooks/useTheme.test.ts— 151 tests passed across the touched suites.pnpm --filter @t3tools/contracts typecheck,pnpm --filter @t3tools/web typecheck— clean.vp linton the touched files — no new warnings (remaining ones pre-date this change).vp run devin an isolated worktree, paired browser,real workspace data): scene follows theme switches and appearance flips, picker updates live,
None restores the base rendering, browser chrome theme sync stays correct with the body fill
cleared.
Model and harness: GLM (enablers/xlarge) via T3 Code / OpenCode, with Codex CLI image generation
for the five scenes and Codex visual QA of the captures.