Blender Git Loki

Alembic import: added unit test for mesh deformation.

Merge branch 'master' into blender2.8

Remove show_backface_culling check in select engine

May add back so selection engine can read backface cull state
from from different engines.

Cycles: Fix access undefined macro on non-MSVC compiler

Also rremove trailing whitespace.

Cleanup: draw engine

- use DRW_engine prefix for engine types.
- use engine suffix for files that define a draw engine.
- remove engines from include path (they're only referenced once)

Draw Manager: add select engine

This does very little currently, but allows changing behavior for
selection drawing in the future.

Allow new selection in eevee & blender draw modes

Draw Manager: armature editmode selection

Eevee: World default shader.

- Use uniform color world for the world probe.
- Refactored the Fresnel expression to be better with Area Lights.
- Squared the roughness for default materials.

Eevee: Disable shadow rendering until we get proper update scheduling.

Performance is quickly getting poor when you have lights otherwise.

Eevee: Fix Square light with non uniform scale.

workaround for T50176

This works around a long outstanding issue T50176 with cycles on msvc2015/x86 . root cause is still unknown though,feels like a game of whack'a'mole

Reviewers: sergey, dingto

Subscribers: Blendify

Tags: #cycles

Differential Revision: https://developer.blender.org/D2573

Draw Manager: support for selection using engines

Needed to remove old draw code entirely.

Object mode selection support, pose and armature still need to be added.
Enabled when 'use_modern_viewport' is set.

Cycles: use safe compiler flags for OpenCL.

Using -cl-fast-relaxed-math assumes no NaN/Inf values in any expression.
This causes problems on overflow, division by zero, square root of negative number.
Comparisons with NaN or infinite value are affected as well.

This patch causes <2% slowdown on benchmark scenes.

Fix T50985: Rendering volume scatter with GPU OpenCL comes to an halt after a few seconds

Workaround for AMD GPU OpenCL compiler.

Eevee: Make default shaders works.

- Added New Batch cache routine to get the split mesh for each material. (optimization needed)
- Did some shader modifications to create default_frag and support a somwhat correct fresnel for lamps (to finish)

Outliner: Re-build depsgraph when reordering collections

Otherwise if we create a new collection, and drag a collection into it we either
get a crash, or at the very least we dont get the visibility flags correct.

Render API: Rename render > render_to_image; view_draw > render_to_view

This is part of the new draw manager design. Any engine (even clay, eevee, ...) should be able to draw to the viewport, as well as render to an image directly.
Changing the API names to conform to that.

Cycles: Use depsgraph instead of layers

Depsgraph: Store Scene in depsgraph struct

This way we can retrieve the scene from depsgraph that were not created from a G.main (e.g., when doing material thumbnail preview render).