FA-51860 / Raster memory layout / Member archive

Morton Page Directory: Page coordinate uses local x or rounds upward · case 05

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

Member previewVariant 5 · 3 implementations · 6 checks per implementation

Case contract

Square 4x4 texel pages use row-major page-directory order and Morton x/y interleaving within each page. Each page has an eight-byte header; directory entries are four bytes and directory storage precedes page bodies. 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	`{"address": 245, "directory_bytes": 24, "morton": 9, "page_bytes": 104, "page_index": 1, "page_start": 183, "page_x": 1, "page_y": 0, "pages_x": 3, "pages_y": 2}`	`{"address": 141, "directory_bytes": 24, "morton": 9, "page_bytes": 104, "page_index": 0, "page_start": 79, "page_x": 0, "page_y": 0, "pages_x": 3, "pages_y": 2}`	Failed

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