Blender Git Loki

UI: Color the inside of pie menu items when selected

Follows the same as other selected/active items in the UI.
Tested in Default theme, 2.7x, 2.4x, Flatty Light and Amaranth
all seem to work fine.

Edit UVs: Fix missing wires with multiple windows

All that was needed is a VAO refresh. It's not a performance problem
because it only concerns a handful of batches.

Edit UVs: Refactor drawing Shadow UV in Image Editor

Currently it's not showing the subdivided mesh (if there is a subdiv mod)
and there is some sync issue if there is multiple uv image space opened.
But thoses will be tackled later on. The purpose of this commit is to fix
the overflow issue of IMM and speed issue.

GPU: Fix partial draw of batches with index buffers

Edit UVs: Refactor drawing Edit UV in Image Editor

NOTE: This commit only concern edit UVs and not the "shadow" mesh displayed
when texture painting. This will be address in a future commit.

We now cache the uv mesh in the mesh batch cache and only reupload data on
changes.

Update could be more granular (and a bit faster) but it's not our main
concern ATM.

This should fix problem caused by the IMM api used to draw large meshes.
This makes performance skyrocket compared to previous implementation.
There is still a big CPU bottleneck when not in sync selection mode but it
is not related to the drawing function directly.

BLI: Add mul_v2_v2v2 function

Shrinkwrap Constraint: implement projection features from the modifier.

Allow raycasting in two directions and culling front or back faces.

Also implement a new Invert Cull option in both constraint and
modifier that can be used to aim for faces aligned with the project
axis direction when raycasting both ways.

Reviewers: mont29

Differential Revision: https://developer.blender.org/D3737

GP: Fix Shadow rotation bug

Remove obsolete weight paint color computation code.

The new weight paint drawing code converts weight to color
directly in the shader, so the old CD_PREVIEW_MLOOPCOL based
code is not needed anymore.

3D View: use context mode string for sidebar

When moving panels from the toolbar to the sidebar,
'bl_context' is now used for filtering panels in both places.

Object Join: use 'selected_editable_objects'

Was using 'selected_editable_bases', which used to save a lookup.
This is no longer the case and complicates access from Python
which cant yet easily access Bases.

Fix T56909: wrong interface scale on macOS 10.14, when using 10.14 SDK.

This does not affect existing releases as far as I can tell, only new builds
using the new SDK have the problem.

Merge branch 'master' into blender2.8

BLI_math: add `isect_seg_seg_v3`

BLI_math: add `isect_seg_seg_v3` function and use in the cloth collision algorith.

In my tests a 4% improvement in performance was achieved by simulating a square cloth over the cube.

Cleanup: use standard prefix for boolean settings

Avoid using 'add' as a prefix, it reads like a method.

Fix freed memory use w/ panel unregister

Cleanup: use tuple unpacking

Cleanup: pep8, unused import

Cleanup: style