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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.