Why is there no DirectX API for Linux?

Question

Upon considering the driver side implementation for DirectX API on windows systems for modern video cards I was wondering why this implementation is not available on non-windows

Answer 1

DirectX is a propriety products designed for Microsoft targets, so for this to happen would be very unusual

There are two other pieces of software that come to mind, SDL and OpenGL

OpenGL provides the hardware alternative to DirectX, and SDL works with OpenGL to provide the software support you would expect from DirectX