[Mesa3d-dev] sw-api-2 branch

[Keith W. <ke...@vm...>]

This has reached a point where I could think about merging it.  There is
plenty more cleanup to do, but the branch makes some big strides and
introduces a couple of concepts that I've wanted for a long time. 

In particular the idea of a designated "targets" subtree which has code
for explicitly constructing driver stacks. 

Secondly the ability to inject layers into (at least) the software
stacks has been greatly improved, and I'd like to see us build on that
for hardware drivers as well.

There is probably still some bugfix to come, but if you're interested in
the software rasterizers, please check out this branch and let me know
how much I've broken things...

Keith