In the comments of the latest blog post, it was mentioned that there is an OpenGL build for Windows, but there were problems with it. Assuming it is still being worked on, or there is enough time available to be able to continue to work on it, if those problems are solved (don't know if the issues are more with the game engine, or with OpenGL in Windows), that could maybe possibly help with the DirectX 11 requirement (don't know what version OpenGL support would be required).
Always wondered why games that support Linux/OSX obviously have working OpenGL support yet you can't use it on Windows. Probably just not worth the effort making it bulletproof when everyone has DX anyway.
In the late 90's it was more common to have multiple API support.
OpenGL support under Windows is very good, currently, but OpenGL as an API doesn't have a company behind it that creates the tools that game developers need and prefer, as 99% of game developers today don't code in assembly any more...;) Microsoft provides excellent developer tools and resources, which has caused D3d to flourish. Unlike every D3d release since 9.0c, D3d12 will be a watershed moving forward--but it will be a couple of years before games begin to require D3d12--but they will...Some independent people are going to attempt to bring similar changes to the OpenGL API and I hope they do, but it will be nowhere near as organized or rapid as Microsoft developer support for D3d12 will be...
I'm never wrong about anything, and so if you see an error in any of my posts you will know immediately that I did not write it...;)
