Blender Git Loki

Merge remote-tracking branch 'origin/blender2.8' into temp-workspace-changes

Manipulator: Only allow negative scale w/ flag set

In most cases we don't want this by default

Manipulator: use solid regions for select drawing

Needed for 3D view selection

Fix missing line of previous commit

Rework in Fast Drawing to avoid lags

Try to avoid any lag for very short and fast strokes

Manipulator: cage2d - uniform handle size

Manipulator: fix cage2d scaling

Eevee: Fix T52713: SSR not working in AMD

This was cause by a fairly funky unitialize buffer (last frame) that was causing NANs during the SSR resolve stage.
They were then propagated to the whole image during the next swap.

Bypassing the SSR completly if no valid history exists fixes the problem. Also disabling SSR data output in this case so we can have correct reflection in the 1st history buffer.

Eevee: Fix T52510: assert with volume defines.

This assert was not making sense at all. Removing

Merge branch 'blender2.8' into greasepencil-object

Eevee: Fix extinction of Light parallel to views.

This was a problem with orthographic views and lights without rotations. This introduce a small bias that should fix most cases.

Cycles: change AO bounces approximation to do more glossy and transmission.

Rather than treating all ray types equally, we now always render 1 glossy
bounce and unlimited transmission bounces. This makes it possible to get
good looking results with low AO bounces settings, making it useful to
speed up interior renders for example.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D2818

Eevee: Fix wrong shadow Orco mapping.

Eevee / DRW : Codestyle

New Viewport Fast Drawing

Now a temp texture is used while the user is drawing to get an instant feedback.

T50354: Action length calculation added unnecessary padding if some F-Curves
only contained a single key (on the last real frame of the action).

Adding some verbose documentation

I thought this was already clear enough, but apparently not.

Eevee: Fix T52480: Can't reproduce Metallic transparency with Principled + Mix Shader

You can now use a transparent shader as a completly transparent bsdf. And use whatever alpha mask in a mix shader between a transparent bsdf and another bsdf.

Eevee: Fix T52546 : 129th light crashes Blender

Fix T52573: Cycles baking artifacts

Synchronize condition for faces split between Cycles itself and baking API.