Blender Git Loki

Merge branch 'master' into blender2.8

Correct sensor fit use

Cleanup leftover timing debug prints from own recent commits.

Sorry about that...

UI: Redo paper panel

Change color for grid lines

Manipulator: fix camera lens update glitch

Property range setup initially used values that can change.

Depsgraph: Flush flags from base to object as an evaluation step

Previously it was done during depsgraph iteration, which is not good at all,
since after evaluation nobody should really modify how object was evaluated.

Depsgraph: Add special cases to deal with multiple objects selection update

The idea then is to avoid doing depsgraph tag for each of the object which
selection is changed (which could be tricky to do anyway due to lots of areas
of selection code where this could happen), and simply tag scene's with
selection update tag.

This will involve synchronization of flags from base to objects, which is
rather cheap anyway.

Depsgraph: Add base flag flush operation definition

Depsgraph: Pass base to build_object()

Depsgraph: Create CoW copy of scene early on

Originally this only needed for view collections, but it will be needed for
bases really soon as well.

Depsgraph: Use depsgraph to handle edit mode selection

This is crucial bit since batch cache is stored in the evaluated object,
meaning we can't tag it's hatch cache dirty from the notifier system.
Not easily at least. Better to leave this job to depsgraph, it knows
all the copies of data.

Eevee: Fix SSR adding too much light.

Basically the probes were rendered twice.

Eevee: Refactor of lit_surface_frag.glsl

This cleanup removes the need of gigantic code duplication for each closure.

This also make some preformance improvement since it removes some branches and duplicated loops.

It also fix some mismatch (between cycles and eevee) with the principled shader.

Eevee: SSS: Principled Shader: Add a workaround the lack of scale input

This is a hack to make the user control the SSS radius even though the profile is baked with the default radius values.

This is completly against UI principles since you cannot edit the profile radiuses while there is something plugged into the radius socket.
Better solution will be to either have a dedicated node value for RGB radiuses and a SSS scale socket only for eevee.

Cleanup: -Wnonnull-compare GCC warning

Merge branch 'master' into blender2.8

Cycles: add object level holdout property, to replace Z mask layer.

Fix unneeded legacy OpenGL call in Cycles viewport drawing.

Address points from initial review.