dtourolle
250ff1e327
`read_output` waited on the copy with `Maintain::Wait`, which parks the calling thread until the GPU is done. That call is made from the UI thread, so the interface was frozen for the length of the copy — the note on this function measures it at ~7 ms at 4K against a 0.28 ms compute pass, so nearly all of it was the wait. `Maintain::Poll` drives the same callbacks without sleeping. The mapping still completes and the pixels are identical; the thread simply is not parked while it happens. The poll loop is bounded. A lost device never delivers the map callback, and spinning forever on that would hang the app rather than report the error the caller already handles. This does not remove the round-trip itself, which ARCH §6.1 forbids and spike S1 replaces by importing the texture into Slint directly. It stops the round-trip from blocking input until then. dr-gpu tests pass, including those comparing readback pixels.
DarkRoom
A cross-platform, non-destructive RAW photo editor for Linux and Android.
Status: early. v0.1 is a remote library viewer — see docs/milestone-v0.1.md.
Documentation
| Document | Contents |
|---|---|
| requirements.md | What the software must do — 122 numbered requirements |
| architecture.md | How it is built — crates, GPU pipeline, data model, sync |
| milestone-v0.1.md | The first buildable milestone |
Building
Desktop:
cargo run -p darkroom-desktop
Android (containerised toolchain, see docker/android):
./docker/android/build.sh cargo ndk -t arm64-v8a build --release
Current state
Working: workspace, GPU context and compute pass, adaptive Slint shell, Android cross-compilation of the core crates.
Not yet working: the zero-copy display path. The build currently uploads frames through the CPU, which is exactly what ARCH §6.1 forbids — measured at 96% of frame time at 4K. Replacing it is spike S1, the project's highest priority.
cargo run -p dr-gpu --example bench --features readback
reproduces that measurement.
Licence
GPL-3.0-or-later.