FA-53159 / Raster memory layout / Member archive

Page Split Texel Spans: First page transfer ignores page boundary or counts preceding bytes · case 04

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

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 2	`{"byte_addresses": [157, 158, 159, 160, 161, 162], "destination_offsets": [0], "first_bytes": 6, "first_page": 7, "first_physical": 157, "page_offset": 13, "remaining": 0, "second_physical": 96, "spans": [[157, 6]], "virtual_start": 125}`	`{"byte_addresses": [157, 158, 159, 96, 97, 98], "destination_offsets": [0, 3], "first_bytes": 3, "first_page": 7, "first_physical": 157, "page_offset": 13, "remaining": 3, "second_physical": 96, "spans": [[157, 3], [96, 3]], "virtual_start": 125}`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.