[Nouveau] [PATCH] nv30/nv40 Gallium drivers unification

[Luca Barbieri]

Currently the nv30 and nv40 Gallium drivers are very similar, and
contain about 5000 lines of essentially duplicate code.

I prepared a patchset (which can be found at
http://repo.or.cz/w/mesa/mesa-lb.git/shortlog/refs/heads/unification+fixes)
which gradually unifies the drivers, one file per the commit.

A new "nvfx" directory is created, and unified files are put there one by one.
After all patches are applied, the nv30 and nv40 directories are
removed and the only the new nvfx directory remains.

The first patches unify the engine naming (s/curie/eng3d/g;
s/rankine/eng3d), and switch nv40 to use the NV34TCL_ constants.
Initial versions of this work changed renouveau.xml to create a new
"NVFXTCL" object, but the current version doesn't need any
renouveau.xml modification at all.

The "unification+fixes" branch referenced above is the one that should
be tested.
The "unification" branch contains just the unification, with no
behavior changes, while "unification+fixes" also fixes swtnl and quad
rendering, allowing to better test the unification. Some cleanups on
top of the unfication are also included.

That same repository also contains other branches with significant
improvements on top of the unification, but I'm still not proposing
them for inclusion as they need more testing and some fixes.

While there are some branches in the Mesa repository that would
conflict with this, such branches seem to be popping up continuously
(and this is good!), so waiting until they are merged probably won't
really work.

The conflicts are minimal anyway and the driver fixes can be very
easily reconstructed over the unified codebase.

How about merging this?
Any objections? Any comments?