forked from unom/punktfunk
enricobuehlerandClaude Fable 5
ade4266336
Three Deck-test findings in the Vulkan presenter: MAILBOX over FIFO when the surface offers it (PUNKTFUNK_PRESENT_MODE= fifo restores the old default): both are tear-free, but an arrival- paced presenter blocking in FIFO's present queue eats most of a vblank whenever gamescope holds images for its composite pass or cadence drifts against refresh — the display stat flipping 1 ms → 11-13 ms. VK_EXT_hdr_metadata wired up: the host's 0xCE mastering metadata (or the Windows presenter's generic HDR10 baseline until it arrives) is pushed via vkSetHdrMetadataEXT whenever an HDR10 swapchain is (re)- created. Compositors key their HDR-app signaling on this — colorspace alone leaves gamescope treating the app as SDR (no SteamOS badge). And the OSD's HDR tag now reports the display path, not the stream: a PQ stream tone-mapped onto an SDR surface shows HDR→SDR, so the next test distinguishes "badge missing" from "HDR never engaged". Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>