FA-53149 / Raster memory layout / Member archive

Page Split Texel Spans: Virtual page ID uses texel size or rounds upward · case 04

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

Member previewVariant 4 · 3 implementations · 6 checks per implementation

Case contract

Raster texels contain six bytes and may straddle 16-byte virtual pages. A virtual byte span maps through a noncontiguous physical page directory; output contains source spans and offsets for reassembling one texel. 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	`{"byte_addresses": [100, 101, 102, 103, 104, 105], "destination_offsets": [0], "first_bytes": 6, "first_page": 8, "first_physical": 100, "page_offset": 4, "remaining": 0, "second_physical": 176, "spans": [[100, 6]], "virtual_start": 52}`	`{"byte_addresses": [132, 133, 134, 135, 136, 137], "destination_offsets": [0], "first_bytes": 6, "first_page": 3, "first_physical": 132, "page_offset": 4, "remaining": 0, "second_physical": 32, "spans": [[132, 6]], "virtual_start": 52}`	Failed

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