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Cube Face Cross Atlas: Atlas cell reserves only one gutter edge or none · case 04

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

Member previewVariant 4 · 3 implementations · 6 checks per implementation

Case contract

Six square cube faces occupy stipulated cells of a 4x3 atlas cross: [(2,1),(0,1),(1,0),(1,2),(1,1),(3,1)]. Every cell has a one-texel gutter and atlas rows end with a three-byte guard. Face sampling is storage addressing only. 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": 1077, "allocation_end": 2242, "atlas_height": 18, "atlas_width": 24, "cell_origin": [12, 6], "cell_size": 6, "face_cell": [2, 1], "face_row_end": 1102, "pixel_position": [13, 8], "row_pitch": 123}`	`{"address": 1390, "allocation_end": 3031, "atlas_height": 21, "atlas_width": 28, "cell_origin": [14, 7], "cell_size": 7, "face_cell": [2, 1], "face_row_end": 1415, "pixel_position": [15, 9], "row_pitch": 143}`	Failed

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