It uses OpenGL, Vulkan and DirectX 12 as its back-end API renderers and runs most of the PS4 exclusives on high-end machines with some glitches as it is still in beta.
The first and the only emulator which allows you to play PS4 games on both PC & Mac. PCSX4 is an open-source experimental PS4 Emulator project written in C++ for Windows and macOS.