Blender Git Loki

Fix compositor preview not respecting un-keyed changes

This is a part of T66099.

GPencil: Fix Control points of primitives clampoed by Stencil

The control points were clamped to the stroke thickness due the last stencil change.

Now, the shading group is not clamped.

make Block Allocator part of action interface

cleanup: remove unnecessary state parameter

Merge remote-tracking branch 'origin' into soc-2019-cycles-procedural

Use Blender's comments convention

Build environment: Update OpenSubdiv to 3.4.0 RC 2

Newer OpenSubdiv brings fixes and improvements for non-manifold meshes,
which fixes some crashes we've experienced in the recent past when using
Gregory patches.

Additionally, thing new version of OpenSubdiv brings sparse patches,
which allows to multi-thread topology refinement step.

Add 1D, 2D, and 4D noise to EEVEE

make it easier for emitters to specify birth moments

Eevee: Make use of dual source blending for volumetric resolve

This simplify the code and add an example use of dual source
blending.

DRW: Add DRW_STATE_BLEND_CUSTOM

This one enable dual source blending, enabling more fine tuned
blending parameters inside the shader.

emitter decides at which time individual particles are spawned

size-value constructor for SmallVector

initialize attributes with default values

USD: Better detection of whether transforms are animated

When an object in a duplicated collection has a parent that's not in that
collection, it needs to check its entire parent chain for animatedness
(because those parents aren't going to be in the USD hierarchy for that
duplicated object).

User count

thread safe block creation and deletion

use block allocator to allow muliple emitters to emit into the same block

Cleanup: de-duplicate flag checks for button colors

Cloth: ported remeshing code to cpp

This has been done to simplify the code (especially with the use of vector<> over BLI_array and BLI_linklist). This will allow for faster iteration of the code as well.