Two [GPU]-class defects from design/pf-zerocopy-sweep-handoff.md; the code
is compile- and unit-verified, the visual halves still owe on-glass time.
- blend_ref reused a fence and command buffer after a wait timeout: on
TIMEOUT it reset a fence that still had a pending signal and re-recorded
a command buffer the GPU might still be executing — reached exactly in
the contended case the CPU-synced path exists for (no timeline export +
visible cursor + a >1 s GPU stall). A failed wait now drains the device
before the reset (the VkBridge::import_linear precedent), and free_slots
quiesces unconditionally instead of only when a timeline exists, so
teardown after a timed-out sync blend no longer frees objects an
outstanding submission references. (C1)
- cursor_blend.comp anchored NV12 chroma blocks to the cursor's oy, not
the surface chroma grid: for odd oy every UV sample averaged luma rows
one below the rows it covers (a one-row colour fringe on the cursor's
edges, ~half of all cursor positions) and the cursor's last row's chroma
was never written. Block rows now anchor to the chroma grid the same way
spans anchor to the word grid — y0 = floor(oy/2)*2, per-row cy guards
for the straddle block — and blend_geometry counts blocks from the same
anchor (one extra block when oy is odd; covered by new tests, including
negative oy). cursor_blend.spv rebuilt (glslangValidator, spirv-val
clean, drift gate passes). (C6)
Owed on-glass: a stalled-GPU cursor session for C1; an odd-oy cursor
colour check for C6 (subtle fringe on the cursor's top/bottom edge).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
enricobuehlerandClaude Fable 5
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