FA-53128 / Raster memory layout / Member archive

Raster Dma Descriptor Chain: DMA completion marker is on first descriptor or absent · case 03

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

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Each raster row copies a valid contiguous byte region from pitched source to pitched destination. Hardware descriptors hold absolute source, destination, length, next-pointer, and terminal flag; descriptors are 24 bytes and begin at a separate base. 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 3	`{"copy_bytes": 16, "descriptor_addresses": [903, 927], "descriptors": [[153, 542, 16, 927, true], [176, 573, 16, 0, false]], "destination_start": 542, "destinations": [542, 573], "head": 903, "next_pointers": [927, 0], "source_start": 153, "sources": [153, 176], "terminal_flags": [true, false]}`	`{"copy_bytes": 16, "descriptor_addresses": [903, 927], "descriptors": [[153, 542, 16, 927, false], [176, 573, 16, 0, true]], "destination_start": 542, "destinations": [542, 573], "head": 903, "next_pointers": [927, 0], "source_start": 153, "sources": [153, 176], "terminal_flags": [false, true]}`	Failed

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