Blender Git Commits

Fix compile errors and warnings on certain configs

Addresses:
* Compile error on Linux
* Compile error with WITH_OPENXR disabled
* Unused parameter warnings

Add remesh panel to the topbar

This panel has the same options as the mesh properties remesh panel.

Fix missing return value... how did this work even?

Looking at the code this should've failed miserably. No idea how this
could still work fine... Maybe return vars used same stack location?

Fix crash with mesh filters and EEVEE

Add front faces only option to the mask lasso tool

Merge branch 'master' into sculpt-mode-features

Merge branch 'master' into soc-2019-openxr

Draw OpenGL framebuffer upside down in DirectX windows

DirectX is Y coordinates top to bottom, while OpenGL is the opposite.
For the final window manager on-screen drawing, draw to a texture first
and draw that upside down if needed.

Support drawing the VR view into a DirectX window!

Phew! That a fight. But this is also a pretty important feature as it
allows interfacing with Windows Mixed Reality OpenXR runtime and the
HMDs supported by it.

Important remaining issue: The rendered viewport is upside down :) That
is of course because DirectX has the opposite vertical direction than
OpenGL.

When creating a DirectX window, we also create an OpenGL offscreen
context to use for all drawing. Just before swapping framebuffers, the
DirectX window blits the framebuffer of the offscreen context into its
swapchain. This requires the WGL_NV_DX_interop and WGL_NV_DX_interop2
extensions.

For testing/dev purposes, also adds:
* Version of the offscreen to onscreen blitting that's OpenGL only. So
it blits the default framebuffer of the offscreen context into the one
of the onscreen context.
This is disabled by a #define.
* Code to draw a colored triangle using DirectX, also for testing.
Requires the D3DCompiler.lib to be available at compile time. This is
also disabled using a #define.

Convert Embree's internal data to Blender BVH4

Merge branch 'master' into greasepencil-object

Merge branch 'master' into soc-2019-outliner

Outliner: Add modifier keys to box select

Adds shift for add and ctrl for subtract, matching the 3D view
default keymap.

fix attempt for binding to particles

Merge branch 'master' into greasepencil-object

Outliner: Show enable/disable button for constraints

This adds the restriction icon for constraints in the outliner so
they can be enabled/disabled similar to modifiers.

It also moves the icon definition to RNA from the UI template for
the constraints in the properties editor.

Add basic access to Embree's internal data

Cloth: fix edge size error

If there are sewing edges (loose edges), those edges would not have loops, finding the UVs was dependent on the loops, now there is check to see if there is a loop.
TODO: when splitting edges that are connected to sewing edges, need to find a way to add a new sewing edge

Cloth: fix compile errors from recent commits

Merge branch 'master' into soc-2019-openxr