Blender Git Loki

updated manta vec3 extrapolation

now using inside mode as well - similar to extrapolateLsSimple()

Use Git submodule tracking feature

This way we can point submodules to different branches.

There are two side-effects to this:

- Git 1.8.2 becomes the minimal required version now
to support this feature.

- Not sure how doing local changes in submodules followed
by `make update` will behave. We don't use explicit rebase
now.

Perhaps this is not so bad, since it was already quite
dangerous thing to do.

Point addons to 2.8 branch

Clay Engine: Use G.debug_value to test cache performance

Use debug 666 for cache without instance buffer caching.
Use debug 667 for cache with instance buffer caching.

OpenGL immediate mode: transform_manipulator.c

updated mesh distance function

now using raycast in inverted direction as well. if this is not done, there are cases with wrong phi grid (swapped inside and outside)

OpenGL: fix MVP matrix order

Numbers were correct but names were mixed up.

Fix a few compiler warnings with macOS / clang.

Fix T50564: 3D view panning with scroll wheel inconsistent with dragging.

fix OpenGL line count in VSE backdrop

Cycles: Update tiles less frequently for split kernel

Increases the time between tile updates exponentially until theres 10 seconds
between updates. By having more time between updates we can push more samples
to the device at once and keep the number of threads doing actual work
higher. This gives a nice speed up.

Cycles: Add changes that somehow got left out of previous commit

Cycles: Remove remnants of tile splitting

Cycles: Faster version of driver workaround for OpenCL

Fix typo and change `.enabled` to `.active`

Fixup for last commit :/

Fix crash introduced in engine separation (50fb3ea3)

Basically DEG_OBJECT_ITER (or rather,
BKE_scene_layer_engine_settings_update) wasn't creating
Object->collection_settings data for invisible objects.

Now I'm removing those objects from the loop entirely. If we are to
bring them back we need to either create CollectionEngineSettings dat
from them or to skip them in DRW_mode_cache_populate.

OpenGL: further mask_draw tweaks

- smooth round points
- fewer state changes
- minor cleanup & warning fix

This is a follow-up to rB84141f27a668

Fix bplayer (c)

Fix building without Clay engine.