FA-52099 / Raster memory layout / Member archive

Mip Major Array: Rectangular array mip area uses sum or square · case 04

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

Member previewVariant 4 · 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": 340, "dims": [[9, 3], [5, 2], [3, 1], [2, 1]], "layer_origin": 57, "layer_pitches": [61, 36, 21, 16], "level_offsets": [0, 127, 204, 251], "level_spans": [127, 77, 47, 37], "payload_origin": 58, "selected_header": 52, "selected_pitch": 61, "texel_counts": [12, 7, 4, 3]}`	`{"allocation_end": 500, "dims": [[9, 3], [5, 2], [3, 1], [2, 1]], "layer_origin": 57, "layer_pitches": [136, 51, 16, 11], "level_offsets": [0, 277, 384, 421], "level_spans": [277, 107, 37, 27], "payload_origin": 58, "selected_header": 52, "selected_pitch": 136, "texel_counts": [27, 10, 3, 2]}`	Failed

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