cf8f5b632f3a205e00660586f68635ad7e0f3d4c
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Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
  dtourolleandClaude Opus 5
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cf8f5b632f |
Show the develop frame itself, instead of a photocopy of it
The oldest open item in the project (ARCH §6.1, spike S1, AC-8). Every frame
in develop was read off the GPU into a `SharedPixelBuffer` and handed back to
Slint to upload again: ~7 ms at 4K against a 0.28 ms compute pass, 96% of the
frame spent carrying pixels to the CPU and back so they could be drawn where
they already were.
Slint 1.17 will adopt a `wgpu::Texture` directly, and the whole of what that
needs is arrangement rather than code.
**One device, made before the window.** A texture belongs to the device that
allocated it, so the compute passes and the compositor cannot each open their
own. `GpuContext::new_shared` opens one and hands back the instance and
adapter alongside it; `dr_ui::shared_gpu` gives all four to
`BackendSelector::require_wgpu_29(WGPUConfiguration::Manual { .. })`. That
call has to come before the first window, because creating one selects a
backend for you — which is why the GPU is now opened at the top of `run`
rather than two hundred lines down beside the other controllers.
dr-gpu still names no UI type. It hands out raw wgpu and does not ask who is
compositing (ARCH §6.5a).
**Vulkan only on the shared path**, where headless keeps its GL fallback.
wgpu's GL backend reaches its display through EGL at instance creation, and
before a window exists there is no display handle to give it — so a GL
instance cannot later produce the window surface Slint needs from it. A
machine with no Vulkan gets no shared device and browses without develop,
which is the same degradation as no adapter at all.
**`renderer-femtovg` becomes `renderer-femtovg-wgpu`.** The old one is FemtoVG
over OpenGL and cannot be handed a wgpu texture at all. It is not kept
alongside as a fallback: FemtoVG-over-GL has no branch for an imported
texture, falls through to "render this image into a buffer", gets nothing, and
draws nothing — a blank canvas with no error, which is worse than the failure
it would be papering over. The consequence is stated plainly in the manifest:
the desktop app now needs a working wgpu adapter to open a window.
**Two output textures, not one, and this is the part that is not obvious.**
Slint repaints when the image property *changes*, and it decides that with
`PartialEq` — which for two images over the same `wgpu::Texture` says
"unchanged". A pass that reused a single target would have rendered every
slider move correctly on the GPU and shown none of them: right, and invisible.
`AdjustPass` alternates between two targets, so consecutive frames are
genuinely different values. It also settles the read-while-write question that
one queue was already answering.
`RENDER_ATTACHMENT` is added to both render targets. Neither pass uses it;
Slint rejects an imported texture without it, on the reasoning that a
compositor handed a texture may need to draw into it.
**`AdjustPass::read_output` is deleted rather than gated.** It and
`export_pixels` were the same transfer under two names, and the comments
explaining why they were separate are the point of the whole criterion:
reading pixels back to *display* them is the defect, reading them back to
*encode a file* is the only way a file is made. The display twin is now gone
outright, which is stronger than a feature flag — it cannot be turned back on.
`export_pixels` is untouched and still ungated. The `readback` feature comes
off dr-ui, darkroom-desktop and darkroom-android; it stays in dr-gpu, where it
still gates `RenderTarget::read_pixels` and the segmentation field readback.
`examples/develop` moves to `export_pixels`, which is honest — it writes a
PPM — and so no longer needs the feature.
Four tests, each named for what it protects and each of which fails without a
screen if the property it guards breaks:
- the adjust target satisfies every condition Slint's import checks, asserted
in the crate that owns the descriptor, because a descriptor that drifts
fails at runtime on a real display and nothing else would notice;
- consecutive renders are different textures, and the third is the first
again, so the alternation is a rotation and not an allocation per frame;
- the develop canvas has no CPU pixel buffer and does have a wgpu texture —
AC-8 itself, in the terms Slint uses;
- consecutive frames compare unequal as `slint::Image`, which is the property
the repaint actually depends on.
The zoom test's readback moves into the test module. It has to: there is no
library function that copies a displayed frame to the CPU any more, and that
is the point — the round-trip now exists in the test binary and nowhere a
shipping build can reach.
**What is not proven.** No GUI was run. What is verified is that the texture
satisfies the import contract, that the import succeeds, that the canvas is a
texture rather than a buffer, and that consecutive frames are distinguishable.
What is unverified is everything that needs a display: that Slint's FemtoVG
wgpu renderer adopts the Manual configuration on a real surface, that the
picture appears the right way up and the right colour, and the frame timing
that motivated the whole exercise. Android is untouched by testing — the
android backend routes a WGPU29 request to Skia, whose wgpu surface does
handle imported textures, but that is read from the source, not observed.
56 dr-gpu tests and 255 dr-ui tests pass, clippy clean under `-D warnings`,
fmt clean.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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dtourolleandClaude Opus 5
|
cb1d2be240 |
Choose the export folder by walking the server, not by typing it
The destination for a Nextcloud export was a text field. Nobody recalls the exact spelling of a path three levels down, and getting it wrong does not fail — `create_dir` makes whatever was typed, so a misremembered folder becomes a new one at the root and the exports are somewhere nobody looks. So it is picked the way the library root is picked, using the same `FolderBrowser` model the launch screen drives: up, into, and "use this folder", confirming the folder currently *shown* rather than one selected in the list. Same rule in both places, so the phrase means one thing. The model is shared; the worker is not. `settings_ui::spawn_folder_list` is a near-twin of the launch screen's, because that one reaches into the `LaunchController` for its session and reports onto the launch screen's error line, while this one is handed credentials and writes to the settings page. Factoring them together needs a function taking both controllers or a trait implemented twice to abstract two call sites — more machinery than the twenty lines it saves. What matters is shared already: navigation behaves identically because both drive the same model. The callbacks are wired in `lib.rs` rather than in `settings_ui::wire`, because listing a remote folder needs credentials and the settings page holds no session on purpose — it is reachable before a library is opened and must not depend on one existing. With no account the picker says to sign in first, rather than showing an empty list that reads as a server with no folders. Details that are decisions rather than accidents: the picker opens at the library root rather than at whatever half-typed path is in the field, which would list nothing and look broken. The listing area is a fixed 180px, since a folder with sixty children would otherwise push the rest of the settings page off the bottom. "Up" is disabled at the root rather than hidden, so the row does not jump as the user navigates. A failed listing leaves the picker open on the folder it was showing — where the user had got to is not something to discard over a dropped request. And the chosen folder saves immediately like every other setting on a page that has no Save button. The poll timer lives on the controller for the reason `LaunchController` keeps its own there: a `slint::Timer` stops when dropped, so one local to the function that starts it would be collected before the listing arrived. Carries in-flight work from a parallel session — a segmentation pass in dr-gpu, a sidecar cache, and the develop panel's continuing changes. 1020 tests pass, fmt clean. One clippy warning remains and is not mine: `sidecar_cache::dir` is unused while that work is in progress. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> |