[PATCH 0/6] MR9517: d3dx{9,10,11}: Implement a box filter.

[Connor McAdams (＠cmcadams)]

This MR also includes some test code cleanup based on comments [here.](https://gitlab.winehq.org/wine/wine/-/merge_requests/9206#note_120681)

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https://gitlab.winehq.org/wine/wine/-/merge_requests/9517