FA-52103 / Raster memory layout / Member archive

Mip Major Array: Per-layer byte tag omitted or scaled as a texel · case 03

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

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Four ceil-halved mip levels each contain all array layers. Each layer owns a one-byte tag and tightly packed texels; level records add a five-byte header. Return the allocation directory and selected layer origin. 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 1	`{"allocation_end": 339, "dims": [[8, 3], [4, 2], [2, 1], [1, 1]], "layer_origin": 44, "layer_pitches": [96, 32, 8, 4], "level_offsets": [0, 197, 266, 287], "level_spans": [197, 69, 21, 13], "payload_origin": 45, "selected_header": 39, "selected_pitch": 96, "texel_counts": [24, 8, 2, 1]}`	`{"allocation_end": 347, "dims": [[8, 3], [4, 2], [2, 1], [1, 1]], "layer_origin": 44, "layer_pitches": [97, 33, 9, 5], "level_offsets": [0, 199, 270, 293], "level_spans": [199, 71, 23, 15], "payload_origin": 45, "selected_header": 39, "selected_pitch": 97, "texel_counts": [24, 8, 2, 1]}`	Failed

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