When the client acquires the Vulkan queue it has to ensure that
it is not submitting work before other work it depends on already
submitted through the Direct3D 12 API but currently in the internal
vkd3d queue. Currently we suggest to enqueue signalling a fence and
than wait for it before acquiring the Vulkan queue, which is
correct but excessive: it will wait not just for the work currently
in the queue to be submitted, but for it to be executed too,
introducing useless dependencies.
By adding a way to enqueue signalling a fence on the CPU side we
allow the client to wait for the currently outstanding work to
be submitted to Vulkan, but nothing more.
Like we did before commit 6d4782ed7f. That
commit somehow managed to change the "desc" field from
D3D12_RESOURCE_DESC to D3D12_RESOURCE_DESC1, but that breaks the ABI.
