Programming OpenGL on Mac OS X

AGL/Carbon

AGL is the old Carbon-based API with C bindings. The Carbon part needed for windowing and event handling are not thread-safe. There is no 64 bit version of this API.

Cocoa/NSGL

Cocoa is the modern API with Objective-C bindings. Mac OS X 10.5 Leopard ships 64 bit versions of Cocoa.