Blender Git Loki

Merge branch 'master' into sculpt-dev

EEVEE: Cleanup: Remove setup_noise from bsdf_sampling

Not needed anymore and makes code harder to read.

EEVEE: Cleanup: Remove sample count from bsdf_sampling

Makes uniform more local to where they are needed.

Sculpt expand: Fix crash when missing connected components

EEVEE: Fix incorrect fresnel function

This caused discrepency between cycles and EEVEE.

GPencil: Fix merge problems

Merge branch 'master' into temp-gpencil-interpolate

Conflicts:
source/blender/editors/gpencil/gpencil_edit.c

Merge branch 'master' into temp-gpencil-io

Merge branch 'master' into greasepencil-object

Merge branch 'master' into cycles_procedural_api

use a dedicated thread to prefetch data

avoid repacking hair topology and shaders if possible

avoid freeing and reallocating memory on the device if possible

deps: upgrade USD 20.05 ? 21.02

USD version 21.02 includes two of the changes Blender used to patch in,
which have now been removed from `usd.diff`. Unfortunately 21.02
introduces another issue where LZ4 symbols are accidentally exported,
causing linker errors. Fortunately these symbols are only used for
testing, so I added a patch hunk that simply removes their `extern "C"`
declaration.

The LZ4 linker issue has been reported upstream at
https://github.com/PixarAnimationStudios/USD/issues/1447.

add logic to prefetch frames

WIP: curve sculpting

EEVEE: Fix issue with planar SSR

EEVEE: Fix most regression with ambient occlusion

Occlusion had change because of the way it was applied.
Get back to almost the same thing we had previously. The only thing
that changed is the occlusion of Normal mapped surface.

It is a bit less noticeable due to a new approximation we make.

Sculpt: fix pose brush flood fill with symmetry

Apply orientation when importing USD normals.

Also added check to ensure normal and loop counts match.