fix(client): Linux auto decoder tries VAAPI before FFmpeg-Vulkan on desktop Mesa

Mesa now exposes Vulkan Video decode queues by default (and the session binary opts RADV in for the Deck's sake), which silently moved every desktop AMD/Intel box onto FFmpeg-Vulkan-on-Mesa under `auto` — user-reported (CachyOS/KDE) to judder or error-streak into the software demotion while an explicit VAAPI pick streams perfectly. Auto's hardware order is now device-aware (`VulkanDecodeDevice::prefer_vulkan_over_vaapi`, fed vendor id + device name by the presenter): Vulkan-first stays only where it is the established right answer — NVIDIA (no usable VAAPI) and the Deck's VanGogh (VAAPI dmabuf import chroma-fringes) — and everything else gets the battle-tested zero-copy VAAPI first, with Vulkan as its fallback. A mid-session Vulkan failure streak now also demotes to VAAPI before software, so a broken Mesa Vulkan path can never strand a box with a perfectly good VAAPI driver on CPU decode. The GTK shell's decoder setting gains the missing "Vulkan Video" option (values now mirror the console UI's auto/vulkan/vaapi/software) and drops its pre-Vulkan "Automatic (VAAPI → software)" label. Verified on the RTX 5070 Ti box (loopback session, auto → "Vulkan Video hardware decode active", 60 fps); policy locked by unit test; clippy -D warnings + pf-client-core/pf-presenter tests green on Linux. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-14 19:41:37 +02:00
parent 9b7fc127ef
commit 46b7ffc001
4 changed files with 139 additions and 14 deletions
@@ -158,7 +158,7 @@ A few knobs are read by the native **clients**, not the host:

 | Setting | Values | Meaning |
 |---|---|---|
-| `PUNKTFUNK_DECODER` | `software` · `vaapi` (Linux) | Force the decode path. Default auto-selects hardware (VAAPI on Intel/AMD, D3D11VA on Windows) with a software fallback. |
+| `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. |

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