Blender Git Loki

Merge branch 'master' into temp-openxr-buildstuff

Tag for gizmo-redraws only for continuous gizmo redraws

Note that this still doesn't make any difference in what we actually
redraw, hopefully soon it will.

Fix continuous viewport redrawing (even without VR session running)

With the VR add-on enabled, the viewport would constantly redraw.
Thought we'd only create gizmo-group instances for groups where the poll
function was successfully executed, but that's not the case. So we still
need to execute the poll and prepare context for that.

Fix compiler warning on Linux, swapping with wrong type

Fix scene lighting and shadow options having no effect

Merge branch 'soc-2019-openxr' into vr_scene_inspection

Cleanup: use named unsigned types in the Python API

mathutils: support Vector.rotate for 2D vectors

Fix ushort compiler errors in Windows

ushort is not supported

Fix some issues with versionning of older files.

Consequences of own refactor of usercount handling in readfile.c
(rB367ecff15d74).

Not super happy to have to call that function twice, but that should be
OK (not a real overhead here anyway).

Cleanup: remove use of 'register'

This isn't needed with modern compilers.

Cleanup: unused structs

Fix missing error message on convex hull failure

Also remove unused errors.

Cleanup: rename mul_m2v2 to mul_m2_v2

Matches mul_m3_v3

Modifiers: Refactor Mask modifier

The functionality of the mask modifier remains unchanged.

This patch updates the mask modifier so that it uses C++.
The manual memory management has been replaced with proper containers.
The large `applyModifier` function has been splitup into multiple smaller functions.
A large speedup is achieved by using simple arrays instead of hash tables in multiple places.

In my performance test file the playback speed increased from 1.1 to 5.1 fps on my laptop.

Reviewers: campbellbarton, brecht

Differential Revision: https://developer.blender.org/D6779

mathutils: support for to_2x2 as well as non-square matrices

BLI_math: add 2x2 matrix utilities

CMake: Suppress strict warnings for extern on macOS

Silences a lot of noise from Mantaflow.

Fix T73960: GPencil can't convert while it is a separate from old strokes

The problem was the new object hadn't any layer active.

EEVEE: Fix default material disappearing when SSRefraction is enabled