Blender Git Loki

UI: free up bit in uiBut.flag

UI: workaround glitch refreshing the toolbar

UI: draw operator menus below buttons

Following the down arrow on the buttons

UI: store tool index of non-active tools

Cycles: Add another limit to OpenCL memory usage

Some drivers may report very large allocation sizes, which could cause
unnecessary memory usage. This is now limited to 2gb which should
still be enough to get the needed performance benefits without waste.

UI: support nested tools in toolbar

Space clip: Make it more clear that filter track does not use any settings from tool shelf

Merge branch 'master' into blender2.8

UI: use button_operator in operator_menu_hold

Move draw calls into UI_menutype_draw

UI: draw active tool pushed in

Merge branch 'master' into blender2.8

Cleanup: code style

Implement a new automatic handle algorithm to produce smooth F-Curves.

The legacy algorithm only considers two adjacent points when computing
the bezier handles, which cannot produce satisfactory results. Animators
are often forced to manually adjust all curves.

The new approach instead solves a system of equations to trace a cubic spline
with continuous second derivative through the whole segment of auto points,
delimited at ends by keyframes with handles set by other requirements.

This algorithm also adjusts Vector handles that face ordinary bezier keyframes
to achieve zero acceleration at the Vector keyframe, instead of simply pointing
it at the adjacent point.

Original idea and implementation by Benoit Bolsee <benoit.bolsee@online.be>;
code mostly rewritten to improve code clarity and extensibility.

Reviewers: aligorith

Differential Revision: https://developer.blender.org/D2884

updates for new manta pp files, also added first setup for viscosity and surface tension

Cleanup: use term shape-preset in widget code

UI: Option to draw button pressed

Needed to show the active tool

UI: Add UILayout.operator_menu_hold

This is an operator button that opens a menu when the button is held.

Eevee: Fix Black volumetrics.

Was caused by a division by 0.

Fix T53217: GLSL principled BSDF black with zero clearcoat roughness.

Eevee: Fix crash when using only 1 viewport sample + volumetrics