No types of AO work with Bioshock 2. Is there any way to enable it? The game can use (or could use, I've heard the profile was deleted) Nvidia Control Panel or Radeon Pro - forced AO, but I'm not gonna use these. Maybe there's something I'm missing? Tried dx9 and dx 10 modes already.
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Games table on this website tells you that support for Bioshock 2 is "good" with no depth buffer access. And AO logically needs depth buffer access and won't work without it. You also won't be able to use the other depth depending effects such as RBM, DoF etc.