FA-52112 / Raster memory layout / Member archive

Mip Major Array: Mip-major directory sums one layer or includes current level · case 02

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

Member previewVariant 2 · 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": 246, "dims": [[7, 3], [4, 2], [2, 1], [1, 1]], "layer_origin": 31, "layer_pitches": [64, 25, 7, 4], "level_offsets": [0, 64, 89, 96], "level_spans": [133, 55, 19, 13], "payload_origin": 32, "selected_header": 26, "selected_pitch": 64, "texel_counts": [21, 8, 2, 1]}`	`{"allocation_end": 246, "dims": [[7, 3], [4, 2], [2, 1], [1, 1]], "layer_origin": 31, "layer_pitches": [64, 25, 7, 4], "level_offsets": [0, 133, 188, 207], "level_spans": [133, 55, 19, 13], "payload_origin": 32, "selected_header": 26, "selected_pitch": 64, "texel_counts": [21, 8, 2, 1]}`	Failed

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