FA-52609 / Raster memory layout / Member archive

Sparse Resident Tile Map: Residency predicate rejects slot zero or accepts missing tiles · case 04

The returned physical layout descriptor disagrees with the declared buffer mapping at resident.

Member previewVariant 4 · 3 implementations · 6 checks per implementation

Case contract

A 4x4 tiled texture has a virtual tile directory mapping tile IDs to optional physical slots. Physical slots have two-byte tags; absent slots use a supplied fallback byte address and must not be interpreted as slot zero. Return the named intermediate layout descriptor and final address fields; all quantities are integer byte offsets unless explicitly stated.

Why this case matters

Offline raster resource, upload, readback, and storage-layout regression model.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
layout fixture 3	`{"address": 12, "candidate": 86, "directory_entry": 52, "local_index": 8, "physical_start": 44, "resident": false, "slot": 0, "slot_pitch": 82, "tile_columns": 4, "virtual_id": 2}`	`{"address": 86, "candidate": 86, "directory_entry": 52, "local_index": 8, "physical_start": 44, "resident": true, "slot": 0, "slot_pitch": 82, "tile_columns": 4, "virtual_id": 2}`	Failed

MEMBER ARCHIVE

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

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