Blender Git Loki

Add basic support for instanced mesh

GPencil: Use separate pass to merge depth buffers together

This uses a fullscreen pass to resolve 2 depth buffers.

We do this to avoid doing depth test inside the blend color pass.

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

Add 1D, 2D, and 4D noise to OSL.

SVM is still in the works, though I have updated the 3D version to work for now.

Sequencer: Assign Refresh All to Ctrl-R.

This is needed based on studio feedback to make it quicker to refresh the sequencer clips.

[Fast import/export] Fixed small memory leak and apply object transform to mesh

[Fast import/export] Fixed two off by one bugs and writing UVs indexes even though none are available

USD: Start of hair export support

Only the parent strands are exported, and only with a constant colour.
No UV coordinates, no information about the normals.

Fix audio not updating when snapping strips in sequencer

Cycles: add back control to render first N bounces with path termination

It's found in the Sampling > Advanced panel and 0 by default. This helps to
reduce noise in some scenes, while making others slower.

Fix Cycles OSL assert when running tests

Merge branch 'master' into functions

GPencil: Rework Layer Blending

Layer blending is now done by the hardware and uses dual source blending.
This patch breaks a few things:
- The depth of the blended strokes are not merged anymore.
- The layer masking is broken.
Theses will be for a different patch.

I'm not sure if overlay fading (based on alpha) is handle correctly but it
does fade to neutral.

initial experimental vector adaptor data structure

Revert "DRW: Add RGBA16 support for framebuffers"

This reverts commit ad8b8c07bf1aa565a65f1698796d879cee539db1.

GPencil: Revert RGBA16 to RGBA16F

Previews: delay icon preview renders a bit for smoother interaction

With Eevee the user interface, 3D viewport and small icon materials previews
are rendered on the same GPU. This can lead to some choppy interaction when
dragging sliders. Delaying the icon preview render until the user is done with
that helps a bit, though it's no guarantee.

function to simulate a block

Support Window-less (offscreen) VR session on Windows

Uses the new wmSurface type (non-window drawable container) to manage
the OpenGL, DirectX and GPU module contexts. The draw callback of the XR
surface calls the GHOST_Xr session drawing routines.

What you should see when starting a VR session now (using the WMR
runtime): The Windows Mixed Reality Portal pops up, and a blue
background is drawn on the HMD. This is from the blue color clear call
we do in the drawing preparations of the GHOST_Xr session drawing.

[Fast import/export] Removed clang-format overrides