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punktfunk/crates/pf-presenter
enricobuehler ade4266336
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fix(presenter): MAILBOX present; push HDR10 metadata; honest HDR tag
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>
2026-07-08 12:29:56 +02:00
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