[acqq]

It should be something elementary the author still hasn't implemented properly during his porting actions. He says that he has "specific startup code" in "two different sets of the same GL code" in "copy-pasted-slightly-edited" form and that he "started writing things specific to OSX. Memory management, file I/O, timers, date handling, threading, etc."

Basically, there's a lot that could possibly go wrong during his first days of porting, and after all that he just saw "the title screen" and observes 1 FPS rendering. So it can be anything, it's too early to know, I hope the author posts later what was missing.

The existing OSX drivers are surely good enough for games, so it's the problem of the use and surely not the case that "the platform doesn't allow" or the "drivers."

Also note that it's not about DirectX vs OpenGL. He has OpenGL on Windows too (see the first paragraph here for the quote).