FA-50599 / Raster clipping / Member archive

Stencil clip pass: reference mask · case 04

Stencil comparison masks stored bits but leaves reference metadata bits unmasked.

Member previewVariant 4 · 3 implementations · 16 checks per implementation

Case contract

Finite integer stencil values use three low bits. A clip pass compares masked stored values to masked reference, then applies distinct pass/fail operations only inside the incoming coverage set. Write masking preserves unrelated bits. Supported operations keep, zero, replace, saturating increment/decrement and invert.

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 3	`[[0, 0, 0, 0, 0, 0, 0]]`	`[[4, 4, 0, 0, 0, 0, 0]]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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