Blender Git Loki

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.

Merge branch 'blender2.8' into greasepencil-object

Merge branch 'blender2.8' into ui_layout_gridflow

Some more tweaks and cleanup.

Deduplicate some code, new solution to the fixed-estimated-size problem.

New GridFlow code was duplicating most of already existing func to
handle passing layout settings from parent to new child, fixed.

Also, added new 'variable' flag to uiLayout, set for GridFlow and all
its children, that enforce items to always estimate their real ideal
size, and not some arbitrary large fixed value.

Merge branch 'blender2.8' into greasepencil-object

Merge branch 'blender2.8' into ui_layout_gridflow

Extrude operator for hair bundles.

Cleanup: Remove unused line

Add a new User Prefs parameter to control GP multisample AA

For general use of Viewport the multisample AA is not required and can produce errors in selection, but for grease pencil the AA is required all the time to get smooth lines, so a new parameter has been added to User Prefs screen to define this value.

If we use the same value for both AA (grease pencil and Viewport), the viewport would be intefered by grease pencil settings.

The new value is below Viewport Samples.

By default the value was set to 4 samples.

This changes was done as result of requirement of grease pencil development team artists.

WIP: Add parameter to multisample

Merge branch 'hair_guides' into hair_guides_grooming

Backport a few changes from the grooming branch.

material_index in hair system has been removed. The material/shader
for hair should be defined externally it doesn't make sense to rely
on the scalp object material slots for this.

Merge branch 'hair_guides' into hair_guides_grooming

Make the hair binding function more robust when no guide curves are defined.

Add "remove" operator for groom regions.

Make the hair binding function more robust when no guide curves are defined.