* On all APIs when depth is disabled the writes are skipped as well. Explicitly
set the function and write state to say that they are disabled.
* This also papers over a weirdness on D3D11 which has confused a couple of
people, where the retrieved desc with GetDesc() on a state object can be
different to the one it was created with when you set ignored parameters -
like the depth function with depth disabled.
baldurk
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