Blender Git Loki

Workbench: Xray: Make dithered depth dependant on alpha.

The range is 0.25 to 0.75 opacity when the Xray opacity is between 0.0 to 1.0.

This is to avoid loosing completely the sense of occlusion when having no
other solid drawing than the wireframe and loosing the transparency when
xray alpha is at 1.0.

Also replace Bayer (checkerboard) method by interlieved gradient noise to
minimize the chance to loose an occluded line completely.

Other noise function could be tested in the future.

UI: Add redo last to edit-menu

Updates to volume kernel tiling function.

1. OpenCL and CUDA support (mostly untested).
2. Change name of offsets to grid_info since it needs to keep track of
other info as well.
3. Several speed and memory optimizations.

Experimental Tweak: Only show relationship lines between objects when either the parent/child object is selected

As in Pose Mode, the idea here it to try to reduce viewport complexity
without requiring users to turn off the overlay completely all the time.
For example, a background prop (e.g. a tree with a tyre hanging off it,
or a branch with hand-placed leaves) won't be cluttering the viewport with
its relationship lines all the time, when you're trying to do something else.

When you really do need to see these lines, you can still select the object
in question, and you'll see the lines for which objects are its children
or what its parent is. And to see all lines, you can still always select all
objects.

Viewport: "Show Relationship Lines" overlay toggle is now respected by Object Mode & Armatures (Edit/Pose)

Merge branch 'blender2.8' into greasepencil-object

UI: change toolbar icon size from 38 -> 32

UI: use property split for UV mask panel

UI: correct jitter button

UI: use split property for tool settings

Patch by @billreynish w/ edits

UI: remove tab use in the tool-settings

UI: use two columns for the overlay popover

Also use sub-panels.

Patch by @billreynish w/ edits.

UI: Use flow layout for object properties context

Mainly as a proof of concept and test to use in other contexts.

Merge branch 'master' into blender2.8

WM: add macros to check mouse button/gesture/wheel

Use to check click/drag,
fixes issue with mouse wheel triggering pie menu.

Fix T55423: GLSL compilation error Flat + XRay

Merge branch 'blender2.8' into greasepencil-object

Move calculation of section rotations out of curve caching and into constraints function.

Move parent interpolation shader to common_hair_guides_lib.glsl

Support hair fiber drawing in the workbench engine.