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    • GSdx-D3D11: Avoid undefined behavior in swapchain
      PCSX2 sends a negative value (-1) to GSdx when adaptive mode is
      specified for Vsync, this mode is exclusive to OpenGL at the moment
      and is unimplemented on the D3D11 renderer. Also the present function
      of swapchain only accepts values from 0 to 4 as parameter, hence
      passing negative values to the function is undefined behavior.
      So let's fallback to standard synchronization method on D3D11 when
      PCSX2 requests for adaptive mode.


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