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Re:Metal – Apple’s new graphics API by fleitz on Tuesday June 03, 2014 @12:11AM (#7838098)
Then you don't need Metal. APIs are typically written for general use cases.

Independent dev writing low poly apps for multiple platforms is the Unity use case.

OpenGL 2.1 will be supported forever, don't worry, since you don't need anything more than GL2.1 it will run everywhere.

Re:Metal – Apple’s new graphics API by kuschku on Tuesday June 03, 2014 @05:13AM (#7838887)
You will need more modern stuff than OpenGL2.1 because OpenGL2.1 uses a really deprecated model. You'd really want use the new rendering system based on VBOs and Shaders instead of glBegin().
Re:Metal – Apple’s new graphics API by jarrett on Tuesday June 03, 2014 @10:50AM (#7840515)
OpenGL 2.1 has VBOS and shaders. I've never used immediate mode with 2.1.