Blender Git Loki

Get duplicating area into new window to work

We don't duplicate the workspace or the layout-type anymore. We just open a
new window with the same workspace and same layout-type.

Solve subwindow console warning

Avoid error in data panel if object is not GPencil

Minor cleanup

Add preference

Various minor changes, add back old multi-pass select

Enable cache

Modified method of cycling selection

Use unsigned int for depth values

Completely get rid of per-window data duplicates from workspaces

Cycles: add single program debug option for split kernel

Single program generally compiles kernels faster (2-3 times), loads faster,
takes less drive space (2-3 times), and reduces the number of cached kernels.

Cycles: split kernel_shadow_blocked to AO & DL parts

Reduces memory allocation for split kernel.

This allows for faster rendering due to bigger global size,
specially when GPU memory is limited.

Perfromance results:

R9 290 total render time
Before After Change
BMW 4:37 4:34 -1.1 %
Classroom 14:43 14:30 -1.5 %
Fishy Cat 11:20 11:04 -2.4 %
Koro 12:11 12:04 -1.0 %
Pabellon Barcelona 22:01 20:44 -5.8 %
Pabellon Barcelona(*) 15:32 15:09 -2.5 %

(*) without glossy connected to volume

Cycles: Speedup transparent shadows in split kernel

This commit enables record-all transparent shadows rays.

Perfromance results:

R9 290 render time (without synchronization), seconds
Before After Change
BMW 261.5 262.5 +0.4 %
Classroom 869.6 867.3 -0.3 %
Fishy Cat 657.4 639.8 -2.7 %
Koro 1909.8 692.8 -63.7 %
Pabellon Barcelona 1633.3 1238.0 -24.2 %
Pabellon Barcelona(*) 1158.1 903.8 -22.0 %

(*) without glossy connected to volume

Fix crashes closing windows or Blender itself

Cleanup: Use correct function to multiply matrix rotation only

Cycles: SSS and Volume rendering in split kernel

Decoupled ray marching is not supported yet.

Transparent shadows are always enabled for volume rendering.

Changes in kernel/bvh and kernel/geom are from Sergey.
This simiplifies code significantly, and prepares it for
record-all transparent shadow function in split kernel.

Merge branch 'blender2.8' into gpencil_2.8

Show the correct list of screens in the info editor

Reorder OpenGL functions

Also clear depth with exact value

Work towards completely moving workspace data to window level

Stuff is starting to work out!