How soon people forget! OS X had a software-based compositor until 10.2 -- that's when "Quartz Extreme" was introduced. Pretty sure the OpenGL path was planned

How soon people forget! OS X had a software-based compositor until 10.2 -- that's when "Quartz Extreme" was introduced. Pretty sure the OpenGL path was planned the whole time, but the GL drivers were not nearly stable enough to use for such a crucial piece of the system.