Microsoft changed its D3D12 matrix spec twice in 12 days, then took two fixes from one outsider

The draft specification for matrix maths in Direct3D 12 changed shape on October 6, 12 days after the previous rewrite of the same document, and it is still a draft. Microsoft then merged two fixes into its public DirectX headers on October 9 at 23:08 UTC, both of them written by the same contributor outside the company.

The specification is D3D12LinearAlgebraRuntimeFeatureSupport, the document that says how a game asks a driver which matrix operations the hardware can do, and it now reads “Version 0.10 (Draft)”. That version arrived with pull request 257, opened on October 2 and merged at 20:42 UTC on October 6 by Microsoft’s Jesse Natalie. Its own changelog line is the summary: “Matrix construction…