Using the vulkan-helpers from C++ code has turned out to have a lot of
friction, because no other driver uses C++ for this.
So let's bite the bullet and call the D3D12 C-API instead. The C-API
wasn't really around when we started out, but it's there now.
This is still far from ideal; we should really create some wrapping
macros to generate the extremely verbose COM calls.
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15816>
Erik Faye-Lund
4903a7c051