https://bugs.winehq.org/show_bug.cgi?id=45066
--- Comment #5 from Alistair Leslie-Hughes leslie_alistair@hotmail.com ---
From MSDN, D3D11_USAGE_DYNAMIC requires CPU write access.
https://msdn.microsoft.com/en-us/library/windows/desktop/ff476259(v=vs.85).a...
Even the tests show that it's required. https://source.winehq.org/git/wine.git/blob/9fecb7499531ddbcde7970b4d98df92d...