FA-52110 / Raster memory layout / Member archive

Mip Major Array: Mip header is applied per layer instead of per level · case 05

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

Member previewVariant 5 · 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": 359, "dims": [[10, 3], [5, 2], [3, 1], [2, 1]], "layer_origin": 70, "layer_pitches": [181, 61, 19, 13], "level_offsets": [0, 186, 252, 276], "level_spans": [186, 66, 24, 18], "payload_origin": 71, "selected_header": 65, "selected_pitch": 181, "texel_counts": [30, 10, 3, 2]}`	`{"allocation_end": 633, "dims": [[10, 3], [5, 2], [3, 1], [2, 1]], "layer_origin": 70, "layer_pitches": [181, 61, 19, 13], "level_offsets": [0, 367, 494, 537], "level_spans": [367, 127, 43, 31], "payload_origin": 71, "selected_header": 65, "selected_pitch": 181, "texel_counts": [30, 10, 3, 2]}`	Failed

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