FA-53157 / Raster memory layout / Member archive

Page Split Texel Spans: First page transfer ignores page boundary or counts preceding bytes · case 02

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

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 4	`{"byte_addresses": [28, 29, 30, 31, 32, 33], "destination_offsets": [0], "first_bytes": 6, "first_page": 2, "first_physical": 28, "page_offset": 12, "remaining": 0, "second_physical": 128, "spans": [[28, 6]], "virtual_start": 44}`	`{"byte_addresses": [28, 29, 30, 31, 128, 129], "destination_offsets": [0, 4], "first_bytes": 4, "first_page": 2, "first_physical": 28, "page_offset": 12, "remaining": 2, "second_physical": 128, "spans": [[28, 4], [128, 2]], "virtual_start": 44}`	Failed

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