It is said that directx is about to be implemented on Linux:
Luca Barbieri made a rather significant commit today that adds a state tracker dubbed "d3d1x", which implements the Direct3D 10/11 COM API in Gallium3D. Luca says this is just the initial version, but it's already working and can run a few DirectX 10/11 texturing demos on Linux at the moment. This is not a matter of simply translating the Direct3D calls and converting them to OpenGL like how Wine currently handles it, but is natively implemented within Gallium3D and TGSI to speak directly to the underlying graphics driver and hardware. Thanks to Gallium3D's architecture, this Direct3D support essentially becomes "free" to all Linux drivers with little to no work required.
Will the nvidia driver support it?