If this is your first visit, be sure to
check out the FAQ by clicking the
link above. You may have to register
before you can post: click the register link above to proceed. To start viewing messages,
select the forum that you want to visit from the selection below.
Perhaps to allow some games that use tesselation shaders to run, albeit at a slower framerate considering the software fallbacks that are needed for supporting the extension that's unimplemented or poorly implemented in the hardware. That would be a crutch until the user upgrades the card to one that does implement the h/w necessary to support those GL4 extensions.
It's never a necessary feature, so far every place that used it did so for eye candy.