feat(background): animate the gradient wallpapers - #691
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A gradient wallpaper can now move slowly behind the recording. The motion is a
new project appearance setting, `wallpaperMotion` ("none" | "drift" |
"aurora" | "waves", default "none"), and only a linear gradient drawn by the
compositor moves.
- Shader mode 5, all three backends, no new mode and no LayerCB change:
fx.z = programme time folded onto 120 s, fx.w = motion index, mb.x = output
aspect. Motion 0 leaves today's gradient untouched, byte for byte.
drift: the axis swings +-15 deg over 20 s. aurora: slow value noise plus
three gaussian blobs in the two stop colours (20-40 s Lissajous paths).
waves: three soft sine bands across the axis, one band per 12 s.
Periods divide 120 s, so folding the clock never shows a seam. Every frame
stays a pure function of programme time.
- Scene: `background.motion` is optional on the gradient and omitted when
still, so a still project sends the same payload. scene.rs defaults it with
#[serde(default)] and maps an unknown value to None, so an unknown value
does not fail the parse. The webcam bubble's gradient never moves.
- Settings chain: editorSettings, projectDefaults, style presets (a preset
without the key reads as "none"; an unknown value is refused),
stylePresetsEditor, projectPersistence (the CLI export reads through it),
migrate's default editor state.
- UI: an "Animation" select under the background picker. It is disabled on a
colour or image wallpaper and says why. It uses the same predicate as the
scene serializer. 14 locales.
- Tests: GradientMotion parsing, the slot helper, sceneDescription payloads,
settings/preset/persistence round trips, the pane's enabled/disabled
states, and an env-gated D3D11 render test. That test checks that a still
gradient is the same at every programme time, and that each motion gives a
distinct, reproducible frame at 3, 9 and 15 s.
Metal is mirrored line by line from the HLSL but was not compiled here.
The animated background had no row in the per-frame cost ladder. It only
exists in a scene, so the row is an A/B of two scene fixtures that differ by
`"motion": "aurora"`, run through `poc-d3d --scene`.
- crates/fixture/scene-gradient-{still,aurora}.json: the two scenes.
- bench.rs: `--scene` now also applies the scene's live params, as the app
export does. Without them the scene padding is ignored and the video covers
the background in the visual proof.
- bench.rs: drop `ClipSource.hold_sec`, which the compositor no longer has.
poc-d3d did not compile without this.
- rendering-performance.md: new "Animated background (C9)" section.
Measured 2026-09-16 on one machine (RTX 4070 Ti, Ryzen 7 5800X, ~55 browser
processes live). Sources are 6 s -c copy cuts of a local 1080p60 recording
because the frozen fixture media were absent. One warm-up pass, then 3
interleaved still/aurora rounds. Each value is the best over the rounds, in
ms/frame:
HW preview C3 (best-of-5): still 4.20 aurora 4.20 spread 59-70 %, void
HW preview C8 (best-of-5): still 6.76 aurora 6.77 spread 5.8-9.0 %
HW export C3 (1 run): still 2.22 aurora 2.24 rounds 2.22-2.36
HW export C8 (1 run): still 2.17 aurora 2.19 rounds 2.17-2.26
WARP preview C3 (best-of-3): still 12.54 aurora 19.69 (+7.15, +57 %)
spread 2.2-6.3 %, one round per arm void
Aurora is free on a GPU, below the noise in every path. On WARP it costs
~7 ms per 1080p frame. The export does animate: a top strip moves by up to
22/255 between frames 0 and 300, against 4/255 when still.
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Important Draft PR not reviewedDraft PRs are not automatically reviewed by default.
To automatically review draft PRs, update your CodeRabbit configuration: reviews:
auto_review:
drafts: true📝 WalkthroughWalkthroughChangesWallpaper motion
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Editor
participant SceneDescription
participant Compositor
participant GradientShader
Editor->>SceneDescription: Set wallpaperMotion
SceneDescription->>Compositor: Gradient background with motion
Compositor->>GradientShader: LayerCB animation parameters
GradientShader-->>Compositor: Animated gradient pixels
Suggested reviewers: Merge Risk: 🔵 Low · up to Existing projects could receive an unintended background-motion default after a future migration change without a focused regression test. Add the coverage before merging. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Description checkExplanation The description gives a brief summary and performance note, but it omits the required template sections for related issue, change type, release impact, desktop impact, screenshots or video, and testing. The issue reference also does not use the required format. Resolution Rewrite the description using the repository template. Add the required headings and checklist selections, use a valid issue reference such as "Refs Full details: Docstring CoverageExplanation Docstring coverage is 68.42% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 38 functions across 26 files. (19 skipped: 19 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 1
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Inline comments:
In `@src/lib/ai-edition/document/migrate.ts`:
- Line 289: Add same-package migration tests covering the `wallpaperMotion`
default: verify an absent `legacyEditor.wallpaperMotion` produces `"none"`, and
verify a valid legacy motion value is preserved instead of the default. Extend
the existing migration test suite without changing unrelated migration behavior.
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⛔ Files ignored due to path filters (1)
crates/compositor/src/shaders.hlslis excluded by!**/*.hlsl
📒 Files selected for processing (45)
crates/compositor/src/compositor_linux.rscrates/compositor/src/compositor_macos.rscrates/compositor/src/compositor_windows.rscrates/compositor/src/frame_geometry.rscrates/compositor/src/scene.rscrates/compositor/src/shaders.metalcrates/compositor/src/vk_shaders/layer.wgslcrates/compositor/tests/animated_background.rscrates/fixture/scene-gradient-aurora.jsoncrates/fixture/scene-gradient-still.jsoncrates/poc-d3d/src/bench.rselectron/ai-edition/style-preset-service.test.tselectron/ipc/nativeBridge.presets.test.tssrc/components/ai-edition/RightPanes.backgroundMotion.test.tsxsrc/components/ai-edition/RightPanes.tsxsrc/components/video-editor/projectPersistence.test.tssrc/components/video-editor/projectPersistence.tssrc/components/video-editor/types.tssrc/i18n/locales/ar/settings.jsonsrc/i18n/locales/cs/settings.jsonsrc/i18n/locales/en/settings.jsonsrc/i18n/locales/es/settings.jsonsrc/i18n/locales/fr/settings.jsonsrc/i18n/locales/it/settings.jsonsrc/i18n/locales/ja-JP/settings.jsonsrc/i18n/locales/ko-KR/settings.jsonsrc/i18n/locales/pt-BR/settings.jsonsrc/i18n/locales/ru/settings.jsonsrc/i18n/locales/tr/settings.jsonsrc/i18n/locales/vi/settings.jsonsrc/i18n/locales/zh-CN/settings.jsonsrc/i18n/locales/zh-TW/settings.jsonsrc/lib/ai-edition/document/migrate.test.tssrc/lib/ai-edition/document/migrate.tssrc/lib/ai-edition/store/editorSettings.test.tssrc/lib/ai-edition/store/editorSettings.tssrc/lib/ai-edition/stylePresets.test.tssrc/lib/ai-edition/stylePresets.tssrc/lib/ai-edition/stylePresetsEditor.test.tssrc/lib/ai-edition/stylePresetsEditor.tssrc/lib/projectDefaults.tssrc/native/browserShim.presets.test.tssrc/native/sceneDescription.test.tssrc/native/sceneDescription.tstechnical-documentation/engineering/rendering-performance.md
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Animated shader backgrounds (aurora). Bench: no cost on GPU, +7 ms on WARP.
Chantier 3D, PR 3b. Spec complète et branche d intégration : #682. Empilée sur
feat/3d-programme-time, à merger après.🤖 Generated with Claude Code
Summary by CodeRabbit
New Features
Bug Fixes