Blender Git Loki

Merge branch 'temp-openxr-blenderside' into soc-2019-openxr

Merge branch 'temp-openxr-ghostxr' into temp-openxr-blenderside

Merge branch 'temp-openxr-directx' into temp-openxr-ghostxr

Merge branch 'temp-openxr-buildstuff' into temp-openxr-directx

Merge branch 'master' into temp-openxr-buildstuff

Apply clang-format to changed files

more utility functions

Merge branch 'master' into wm-drag-drop-rewrite

extract preprocessed vtree data from builder

improved debug error checking

cleanup parameter checks

Cleanup: Port back the custom shape ghash to revert perf regression

Using the DRW instancing is much slower because the modelmat ubo is too
small to contain many obmat of the same GPUBatch type.

Cleanup: Remove stipple start position duplication

Removes 3 floats per stipple vert. Using the same technique we could
remove the need for geom shader for GPU internal shader shader.

Overlay Engine: Loose Edges/Verts

Painfully update patch to latest master

Merge branch 'master' into tmp-overlay-engine

Overlay Engine: Fix background image and sort empty images by Z depth

GPencil: Change sort comparison function

Overlay Engine: Sculpt Mask

Overlay Engine: Particles