For things like the latest Doom or pushing 3D hardware to its limits, I'd think no. I can't say how far you could get in pure Swift for 3D engines, but for 2D

For things like the latest Doom or pushing 3D hardware to its limits, I'd think no. I can't say how far you could get in pure Swift for 3D engines, but for 2D games Swift is more than good enough, and you can always interop with C/C++ when you really need to.