FA-51345 / Raster clipping / Member archive

Opaque occlusion clip: clip before occlusion · case 05

Opaque samples outside a draw clip occlude backgrounds.

Member previewVariant 5 · 3 implementations · 11 checks per implementation

Case contract

Draws are supplied back to front as ID, coverage set, opaque flag, clip set and sample-write-enable set. Visibility traverses front to back, subtracting only front opaque written samples. Transparent draws remain visible but do not occlude. Return every draw in original order, including empty visibility, labeled by ID. Repeated IDs are distinct draws. All coverage is finite-target bounded.

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 2	`[[["back", []], ["front", [0, 1]]]]`	`[[["back", [1]], ["front", [0]]]]`	Failed

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