FA-53147 / Raster memory layout / Member archive

Page Split Texel Spans: Virtual page ID uses texel size or rounds upward · case 02

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

Member previewVariant 2 · 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": [42, 43, 44, 45, 46, 47], "destination_offsets": [0], "first_bytes": 6, "first_page": 4, "first_physical": 42, "page_offset": 10, "remaining": 0, "second_physical": 160, "spans": [[42, 6]], "virtual_start": 26}`	`{"byte_addresses": [122, 123, 124, 125, 126, 127], "destination_offsets": [0], "first_bytes": 6, "first_page": 1, "first_physical": 122, "page_offset": 10, "remaining": 0, "second_physical": 16, "spans": [[122, 6]], "virtual_start": 26}`	Failed

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