2011 Mac Mini and 3D Graphics in El Capitan

I've upgraded to El Capitan, and now a program I use to listen to MIDI files, MIDITrail, stopped working. It would not start and would display an error that looks like the core issue was (lack of) OpenGL support. I was also told that my Mac Mini won't support Metal.

So my question is, can my Mac Mini still run programs that require 3D graphics? I'm having the 2011 version Mac Mini. When I was on Mountain Lion 3D graphics weren't an issue, but now even MIDI Trail can't run when it ran when I was on Mavericks. What gives? Did Apple completely disable 3D support on my Mac Mini? If yes, why?