Blender Git Loki

Testing functions: for mixed_bones_object_selectbuffer

- OpenGL Select for old behavior
- Occlusion Queries for possible new behavior, for now we just do one pass since its possible to avoid the second two.

Merge branch 'blender2.8' into gpencil_2.8

Bunch of small HMD fixes, removed old now unused preferences

Merge branch 'master' into HMD_viewport

Conflicts:
source/blender/windowmanager/wm.h

Fixup for python UI definition

Fixes for HMD support windows build (thanks LazyDodo)

New OpenHMD 0.3rc version with PSVR, Oculus CV1 and better Vive tracking support.
Also introduces global shader, which will be adjusted based on the variables of the HMD drivers, this will make the manual selection of lens correction shaders obsolete, will be removed in next commit.

The hmd window is currently black before started (due to shader not having the hmd data yet), will be fixed as well.

Merge branch 'master' into HMD_viewport

Fix issues changing HMD device

Fix python UI for building without HMD

Disable OpenHMD dummy device for release builds

Also fixing warning.

Don't allow orthographic view in HMD view

Displaying camera in orthographic mode is still allowed. We don't want
to mess with render data and forcing perspective viewport rendering in
HMD view even if the camera is set to be orthographic might be
confusing.

"Only Render" option for HMD view

Use view orientation data from current 3D view for creating HMD view

Mirror mode support (sync HMD viewpoint with regular 3D view)

Adds option "Mirror HMD View" to the HMD panel in the 3D view.

In this implementation we update/redraw the mirrored 3D views with the
HMD view, which can actually cause some extra slowdown (drawing the
viewport at least once more). We decided that this would be the best
solution for now, as the other option would be opening a separate window
showing the mirrored result, which is a bit too much against the
non-overlapping paradigma IMHO.
We could also draw the HMD view into some buffer and reuse this for
mirrored displays, but that would mess up projection matrices.
In Blender 2.8 we'll probably be able to use multi-threaded drawing
anyway, for which this would be the perfect use case.

3D View regions mirroring the HMD view are locked, for quadview we only
use the non-locked region for mirroring.

Merge branch 'master' into temp-select-pick

Merge branch 'master' into temp-select-pick

Added back multi-pass occlusion queries

Add depth sorting mode VIEW3D_SELECT_DEPTH_SORT_ALL

Add a call to draw gpencil object for 2D

As the current drawing action is 2D, we need to call the function for drawing.

All previous strokes are drawn in 3D because they are converted after finish each stroke from 2d to 3d.