fix(client): vendor-aware Windows decode order — D3D11VA first on Intel

Intel's Windows driver advertises Vulkan Video (Arc drivers since 2023), so the capability gate alone no longer keeps Intel off FFmpeg-Vulkan — and that combination is broken in the field (B580 report: strobing + 7.2 ms p50 decodes at 4K120) and on glass (Arc Pro iGPU: 29-33 ms p50 decodes at 4K60 where D3D11VA does 2.5 ms on the SAME GPU). Mirror the Linux vendor order on Windows: NVIDIA/AMD keep Vulkan Video first, Intel/unknown take D3D11VA first; vulkan stays reachable by explicit preference and as auto's fallback. Also: - Vulkan→D3D11VA mid-session demotion rung (the Windows analog of Linux's Vulkan→VAAPI rung) — a failing Vulkan backend lands on hardware, not on software, which cannot survive 4K120. - The demotion streak now needs 1 s of age as well as 3 consecutive errors: a startup loss burst produced 3 errors in 20 ms and stranded the session on software decode (one-way) before the IDR requested on the first error could possibly arrive — live-hit on the Intel iGPU leg. - Stale "Intel's Windows driver has no Vulkan Video" comments corrected, docs updated to the per-vendor order, vendor-order test extended with discrete/iGPU Arc cases. Verified on an Arc Pro iGPU + RTX 3500 Ada laptop against a CachyOS/NVENC host: auto now picks d3d11va on Intel (60 fps, 2.5-2.8 ms decode, e2e 26 ms vs 50 ms before) and still picks vulkan on NVIDIA. 27/27 pf-client-core tests, clippy clean. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-19 14:04:32 +02:00
parent 2149673f89
commit 40030e90c8
5 changed files with 160 additions and 48 deletions
@@ -75,7 +75,9 @@ The app is in **Google Play Internal Testing** — request a tester invite on ou
 `punktfunk-client` for Windows (`clients/windows`) is the native graphical client for Windows — pure
 Rust, the same `punktfunk/1` core as the Apple, Linux, and Android apps, with a **WinUI 3** UI (host
 list, settings, PIN pairing); the stream itself runs in punktfunk's Vulkan presenter. Its decoder
-tries **Vulkan Video, then D3D11VA, then software**, with 10-bit/HDR present, WASAPI audio + mic,
+order is per-vendor: **Vulkan Video, then D3D11VA, then software** on NVIDIA and AMD, and
+**D3D11VA first** on Intel and other GPUs (Intel's driver advertises Vulkan Video, but DXVA is the
+proven path there), with 10-bit/HDR present, WASAPI audio + mic,
 SDL3 controllers (rumble, lightbar, DualSense), network discovery, and the full PIN-pairing trust
 surface. It builds for both `x86_64` and `aarch64` and ships as a **signed MSIX**. Launch it and
 pick a host from the list, just like the other native apps.
@@ -161,7 +161,7 @@ A few knobs are read by the native **clients**, not the host:

 | Setting | Values | Meaning |
 |---|---|---|
-| `PUNKTFUNK_DECODER` | `software` · `vaapi` · `vulkan` (Linux) · `d3d11va` (Windows) | Force the decode path. Default auto-selects hardware (VAAPI on Intel/AMD, Vulkan Video on NVIDIA and the Steam Deck, D3D11VA/Vulkan on Windows) with a software fallback. |
+| `PUNKTFUNK_DECODER` | `software` · `vaapi` · `vulkan` (Linux) · `d3d11va` (Windows) | Force the decode path. Default auto-selects hardware per vendor (Linux: VAAPI on Intel/AMD, Vulkan Video on NVIDIA and the Steam Deck; Windows: Vulkan Video on NVIDIA/AMD, D3D11VA on Intel and others) with a software fallback. |

 ## Bitrate

@@ -60,7 +60,7 @@ host is newer than the Linux host.)
 |---|---|
 | **macOS / iOS / iPadOS / tvOS** | VideoToolbox HEVC + AV1 decode (AV1 on hardware that decodes it — M3-class Macs, A17 Pro-class iPhones), GameController capture, full DualSense feedback, mDNS discovery, PIN pairing + TOFU, network speed test, latency HUD. Stage-2 presenter (`VTDecompressionSession` → `CAMetalLayer`, ~11 ms p50 capture→present) is validated on glass and is the default (stage 1 remains the fallback when Metal is unavailable). Ships as one universal TestFlight build / App Store listing. |
 | **Linux** (`punktfunk-client`) | relm4/GTK4 shell; streams run in the spawned Vulkan session presenter. Hardware decode via Vulkan Video (all vendors, incl. NVIDIA) with VAAPI dmabuf and software fallbacks, PipeWire audio + mic, SDL3 gamepads incl. DualSense, mDNS discovery, PIN pairing + TOFU, speed test, Skia console UI + tiered stats overlay. Ships as Flatpak, apt, rpm, and Arch packages. |
-| **Windows** (`punktfunk-client`) | WinUI 3 shell; streams run in the Vulkan session presenter with a Vulkan Video → D3D11VA → software decode chain, HDR10, WASAPI audio + mic, SDL3 gamepads incl. DualSense, mDNS discovery, and the full PIN/TOFU trust surface. Ships as a signed MSIX (x86_64 + ARM64). **Hardware decode validated on NVIDIA and Intel; HDR present pending on-glass validation.** |
+| **Windows** (`punktfunk-client`) | WinUI 3 shell; streams run in the Vulkan session presenter with a per-vendor decode chain — Vulkan Video → D3D11VA → software on NVIDIA/AMD, D3D11VA → Vulkan Video → software on Intel and others — plus HDR10, WASAPI audio + mic, SDL3 gamepads incl. DualSense, mDNS discovery, and the full PIN/TOFU trust surface. Ships as a signed MSIX (x86_64 + ARM64). **Hardware decode validated on NVIDIA and Intel; HDR present pending on-glass validation.** |
 | **Android** (phone + Android TV) | Kotlin app with a Rust core over JNI. NDK `AMediaCodec` hardware HEVC decode + HDR10 (Main10/BT.2020 PQ), Opus/Oboe audio + mic, gamepad input with rumble/HID feedback, mDNS discovery, PIN pairing + TOFU (Keystore identity), tiered stats overlay (three-finger tap), custom resolutions, and D-pad/controller focus navigation for TV. Ships to the Google Play Internal Testing track. |

 `punktfunk-probe` is a headless reference and measurement client (for testing and