Blender Git Loki

Cycles: don't require pthreads as dependency on Windows.

Use C++11 threads when available, and native critical section on Windows.
Later on we can remove pthread code when C+11 becomes required.

Differential Revision: https://developer.blender.org/D3116

Clay: Remove warning.

Cleanup: typo in function name

BLI_array: utility to check memory is zerod

Fix missing confirm quit dialog on macOS, after recent changes.

Cycles: Fix bad register cast in sseb

This is currently unused code, but causes gcc-8 to fail.

UI: Perf: Don't use implicit Attrib.

Implicit attrib is doing memcpy which seems to be slower compared to
individual immAttrib*.

Only fixed the ones who appeared in my profilling logs.

UI: Perf: Group drawcalls inside ui_draw_panel_dragwidget

16 Drawcalls > 1 Drawcall

Do I need to say more?

UI: Perf: Make icon_draw_texture use GWN_draw_primitive.

This bypass the use of immediate mode for theses drawcalls. Placement and
and icon select (via uvs) is done inside the vertex shader.

GPUShader: Cleanup: Remove unused uniform_interface.

DRW: Opti: Make cursor use batch instead of immediate API.

This is also much cleaner and taking 1 drawcall instead of 2.

UI: Fix assert cause by vertex count being too small.

UI: Perf: Optimize widgetbase_draw.

Drawcall per window redraw on default layout:
- 4100+ without patch
- 1270 with patch

Theses drawcalls meant a lot of driver overhead since they each correspond
to one glMapBuffer which is slow.

Fix T54435: Quit prompt fails w/ fractional scale

Merge branch 'master' into blender2.8

Cleanup: global undo (minor changes to internals)

- Get memory usage from MemFile instead of MEM API
avoids possible invalid when threads alloc memory.
- Use size_t instead of uint and uintptr_t to store size.
- Rename UndoElem.str -> filename
- Rename MemFileChunk.ident -> is_identical

Merge branch 'master' into blender2.8

Cleanup: move paint curve undo into own file

Fix T54420: too much volume render noise with multiple volume objects.

Random numbers for step offset were correlated, now use stratified samples
which reduces noise as well for some types of volumes, mainly procedural
ones where the step size is bigger than the volume features.

Eevee Shaders: Fix "No matching overloaded function"

invert -> inverse