FA-52593 / Raster memory layout / Member archive

Sparse Resident Tile Map: Sparse tile directory width truncates partial tiles · case 03

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

Member previewVariant 3 · 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 2	`{"address": 253, "candidate": 253, "directory_entry": 37, "local_index": 5, "physical_start": 231, "resident": true, "slot": 3, "slot_pitch": 66, "tile_columns": 3, "virtual_id": 1}`	`{"address": 253, "candidate": 253, "directory_entry": 37, "local_index": 5, "physical_start": 231, "resident": true, "slot": 3, "slot_pitch": 66, "tile_columns": 4, "virtual_id": 1}`	Failed

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

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