Blender Git Loki

Added per-brush DynTopo settings which are stored in a new DynTopoSettings struct.

This system is designed to inherit settings from scene dyntopo defaults
in a highly flexible way; settings can be individually overridden via the
.inherit bitmask.

At stroke time the scene settings and brush->dyntopo are merged
and stored in brush->cached_dyntopo.

Note that brush->flag has a bit flag, DYNTOPO_DISABLED, with a few
subtlies. It does not switch the PBVH back to PBVH_FACES mode, it
simply disbles dyntopo topology update. It also doesn't inherit from
any default settings. And it's the only setting
that's currently exposed in the UI.

Add this file

Only send all vcol layers to gpu (for pbvh drawing) in a material
draw mode.

* Sculpt color layers are now properly handle by pbvh bmesh draw code.
Before only the active layer was uploaded to the GPU, now all of them
(except the autogenerated original color layer) are.

Code cleanup

clean up code a bit

Fixed two remaining performance bugs with dyntopo:

* Normals are now updated in threads.
* The sculpt neighbor code was using the slower BM_LOOPS_OF_VERT
instead of BM_EDGES_OF_VERT, fixed.

* Added a new CustomData type for dyntopo vertex data: MDynTopoVert.
It stores:
- Original coordiates, colors and mask (which were previously four
seperate layers).
- A bitmask with (currently) one bitflag, whether or not a vertex is
on a boundary.

I needed to cache calculating vertex boundary state (which involves
iterating over the edges surrounding a vertex) and got fed up with
having so many CD layers for dyntopo. This struct consolidates them
and saves having yet another layer just to store a flag.

Merge from master

Merge branch 'master' into temp_bmesh_multires

Merge branch 'master' into temp_bmesh_multires

Merge not finished, but need to commit to move to different computer;
laptop being sent in for repairs

commit before merge

Add a little todo list

Added some code to calculate principle curvature direction for
uniform triangle tesselations (dyntopo). This will be used for
a version of topological rake that aligns edge flows to lines of curvature
automatically.

Merge from master

Merge branch 'master' into temp_bmesh_multires

commit prior to merge

Merge branch 'master' into temp_bmesh_multires

* Yet another attempt at writing a faster distance to tri function.
I think I will end up writing a less accurate version and be done
with it. This is a consistent hotspot in profiling.
* Fixed a few more undo bugs

Merge branch 'master' into temp_bmesh_multires