enricobuehlerandClaude Fable 5
9f72a3b6ad
windows-host / package (push) Failing after 22s
windows-host / canary-manifest (push) Skipped
windows-host / winget-source (push) Skipped
ci / web (push) Successful in 1m7s
ci / rust-arm64 (push) Successful in 1m30s
ci / docs-site (push) Successful in 1m31s
docker / builders (--build-arg FEDORA_VERSION=44, ci/fedora-rpm.Dockerfile, punktfunk-fedora44-rpm, -f44) (push) Successful in 8s
docker / builders (ci/android-ci.Dockerfile, punktfunk-android-ci) (push) Successful in 6s
docker / builders (ci/arch-ci.Dockerfile, punktfunk-arch-ci) (push) Successful in 9s
docker / builders (ci/fedora-rpm.Dockerfile, punktfunk-fedora-rpm) (push) Successful in 11s
docker / builders (ci/rust-ci-noble.Dockerfile, punktfunk-rust-ci-noble) (push) Successful in 19s
docker / builders (ci/rust-ci.Dockerfile, punktfunk-rust-ci) (push) Successful in 15s
docker / apps (., web/Dockerfile, punktfunk-web) (push) Successful in 13s
deb / build-publish-client-arm64 (push) Successful in 2m21s
docker / apps (docs-site, docs-site/Dockerfile, punktfunk-docs) (push) Successful in 1m6s
deb / build-publish (push) Successful in 4m43s
docker / builders-arm64cross (push) Successful in 11s
docker / deploy-docs (push) Successful in 33s
deb / build-publish-host (push) Successful in 5m4s
android / android (push) Successful in 6m40s
ci / rust (push) Successful in 7m10s
arch / build-publish (push) Successful in 8m11s
apple / swift (push) Successful in 5m8s
apple / screenshots (push) Canceled after 10m53s
rpm / build-publish (43, bazzite, punktfunk-fedora-rpm) (push) Canceled after 16m14s
rpm / build-publish (44, fedora-44, punktfunk-fedora44-rpm) (push) Canceled after 15m50s
An HDR display cost you full chroma: the IDD-push capturer's only 10-bit
output was P010, so a session that negotiated 4:4:4 on an HDR desktop was
converted to 4:2:0 at capture time — *after* the Welcome had already told
the client 4:4:4. The client believed it (nothing on the wire contradicts
a Welcome), and the new chroma tag in the stats overlay is what finally
made the discrepancy visible.
Everything except the source was already in place, which is why this is
small: the NVENC config layer has stamped `FREXT` + `chromaFormatIDC=3` +
`pixelBitDepthMinus8=2` — HEVC Main 4:4:4 10 — with a unit test since the
4:4:4 work landed, `PixelFormat::Rgb10a2` already maps to `ABGR10` and
already counts as a full-chroma input, and the desktop client learned the
10-bit 4:4:4 Vulkan pool format in 74863c96. The one missing piece was a
capture format that keeps 10 bits AND full chroma.
`HdrRgb10Converter` is that piece: one full-res pass from the FP16 scRGB
desktop to packed `R10G10B10A2` in BT.2020 PQ, reusing the P010 shader's
`scrgb_to_pq2020` verbatim so both HDR outputs share bit-identical colour
math — it simply stops before the RGB→YUV matrix, the studio-range
squeeze and the chroma decimation. NVENC then does the CSC to YUV 4:4:4
itself under FREXT, exactly as the SDR BGRA passthrough has always done
at 8 bits.
No swizzle is involved and that is worth stating, because it looks like
it should be: NVENC names packed formats from the MSB down, so its
`ABGR10` (A2B10G10R10) puts R in the low 10 bits — bit-identical to DXGI
`R10G10B10A2_UNORM`. It is the same relationship the proven SDR pair
relies on between DXGI `B8G8R8A8` and NVENC's `ARGB`.
The honesty gap closes as a consequence: `capturer_supports_444` no
longer has a depth it cannot serve, so the chroma resolved before the
Welcome is the chroma the wire carries. AV1 is deliberately untouched —
Range Extensions are HEVC-only and no consumer encoder does AV1 4:4:4.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>