FA-51412 / Raster clipping / Member archive

Pick buffer clip coverage: clear depth · case 02

Clearing the pick sample leaves old depth that rejects new objects.

Member previewVariant 2 · 3 implementations · 11 checks per implementation

Case contract

Each draw has an object ID, coverage samples, clip samples, integer depth, depth-test flag and ID-write flag. ID zero is a valid object. Pick samples start empty with infinite depth. With depth test enabled, strictly nearer fragments replace stored IDs and depth; equal depth keeps the earlier fragment. Disabled depth testing writes without changing depth. ID-write-disabled draws still update depth when tested. Queries return IDs or null for out-of-target samples.

Why this case matters

Raster clip state can leak coverage across draws even when every individual region is valid.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
explicit sequence 6	`[[null]]`	`[["b"]]`	Failed

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