FA-53183 / Raster memory layout / Member archive
Page Split Texel Spans: Texel reassembly overwrites first chunk or uses page-size destination offset · case 03
The returned physical layout descriptor disagrees with the declared buffer mapping at destination_offsets.
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 fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| layout fixture 3 | {"byte_addresses": [93, 94, 95, 192, 193, 194], "destination_offsets": [0, 0], "first_bytes": 3, "first_page": 10, "first_physical": 93, "page_offset": 13, "remaining": 3, "second_physical": 192, "spans": [[93, 3], [192, 3]], "virtual_start": 173} | {"byte_addresses": [93, 94, 95, 192, 193, 194], "destination_offsets": [0, 3], "first_bytes": 3, "first_page": 10, "first_physical": 93, "page_offset": 13, "remaining": 3, "second_physical": 192, "spans": [[93, 3], [192, 3]], "virtual_start": 173} | Failed |
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