FA-53185 / Raster memory layout / Member archive
Page Split Texel Spans: Texel reassembly overwrites first chunk or uses page-size destination offset · case 05
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": [223, 240, 241, 242, 243, 244], "destination_offsets": [0, 0], "first_bytes": 1, "first_page": 13, "first_physical": 223, "page_offset": 15, "remaining": 5, "second_physical": 240, "spans": [[223, 1], [240, 5]], "virtual_start": 223} | {"byte_addresses": [223, 240, 241, 242, 243, 244], "destination_offsets": [0, 1], "first_bytes": 1, "first_page": 13, "first_physical": 223, "page_offset": 15, "remaining": 5, "second_physical": 240, "spans": [[223, 1], [240, 5]], "virtual_start": 223} | Failed |
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