FA-52998 / Raster memory layout / Member archive

Virtual Texture Gutter Atlas: Atlas cells transpose coordinates or use tile interior width as columns · case 03

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

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

A 4x4 virtual tile occupies a 6x6 atlas cell, including one replicated texel on every side. Physical cell IDs come from a remap; atlas width is five cells. Input requests an interior texel, and output includes four border-copy addresses. 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 1	`{"address": 1993, "bottom_border": 2113, "cell": 7, "cell_origin": 1497, "cell_xy": [1, 2], "interior_origin": 1621, "left_border": 1977, "right_border": 1997, "row_pitch": 120, "top_border": 1513}`	`{"address": 1297, "bottom_border": 1417, "cell": 7, "cell_origin": 801, "cell_xy": [2, 1], "interior_origin": 925, "left_border": 1281, "right_border": 1301, "row_pitch": 120, "top_border": 817}`	Failed

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

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