FA-52022 / Raster memory layout / Member archive

Compressed Block Payload: Selector ordering is transposed or assumes square blocks · case 02

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

Member previewVariant 2 · 3 implementations · 6 checks per implementation

Case contract

A stipulated 4x3 block format stores 5 endpoint bytes followed by twelve one-byte texel selectors. Block rows are padded to a multiple of three blocks; selector lookup never decodes colors. 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	`{"allocation": 102, "block_columns": 2, "block_rows": 2, "block_size": 17, "block_start": 22, "block_valid_texels": 12, "padded_columns": 3, "row_pitch": 51, "selector_address": 32, "selector_id": 5}`	`{"allocation": 102, "block_columns": 2, "block_rows": 2, "block_size": 17, "block_start": 22, "block_valid_texels": 12, "padded_columns": 3, "row_pitch": 51, "selector_address": 36, "selector_id": 9}`	Failed

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

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