Blender Git Loki

Fix OpenCL performance regression after cubic interpolation.

Reorganize code to reduce register pressure.

Merge branch 'master' into blender2.8

Edit Mesh/Curve: Median center for click extrude

Was using bound-box center which depends on rotation.

Add some basic 4K render presets.

This difinition is becomming rather common now, time to add it to our
collection imho (requested in T53064).

Edit Mesh: click extrude, ensure inverse matrix

Relied on this being set elsewhere which isn't assured.

Merge branch 'master' into blender2.8

Correct bezier curve assert

Bezier curves should have v-points zero'd.

Merge branch 'master' into blender2.8

Cleanup: use const for events

Hide "Confirm on Release" button from transfor redo options

Hide-flag wasn't set so option shows up in keymap editor. But seems like
that flag is ignored there by now anyway.

Eevee: Contact Shadows: Fix remaining artifacts.

There was noise correlation between the rotation random number and the radius random number used in the contact shadow algo.
Hacking a new distribution from the old distribution (may not be ideal because it's discrepency may be high)
Also distribute samples evenly on the shadow disc. (add sqrt)

Fix the "bias floating shadows", was cause by the discarding of backfacing geom which makes no sense in this case.

Fix scene deletion code to match master's behavior.

Previous code, while more correct than old master one, could still lead
to invalid state in some corner cases (like linked scenes...).

Merge branch 'master' into blender2.8

Conflicts:
source/blender/editors/screen/screen_edit.c

Fix T53052: ID decrement error when deleting a scene, either python or GUI.

User count of scenes was inconsistant, screens only have 'user_one' kind
of owning over scenes, which means they shall never increment or
decrement their real user count. And usually, scenes have no real user
at all.

Fix T52999: floating (popup) panels/menus could jump around screen in some cases.

Would happen during panel's refresh drawing, if drawing code had to adjust
final panel position compared to the initial one computed based on the
mouse coordinates, and user had dragged the floating panel around.

Issue fixed by adjusting stored mouse coordinates once final panel
position is known, such that they would directly generate those
coordinates. that way, the basic offset applied to those stored mouse
coordinates during panel dragging is valid, and recreating panel based
on those won't make it jump in screen.

Note that panel will still jump in case user dragged it partially out of
view - we could prevent that, but imho it's better to keep that
behavior, since redraw can generate a popup of different size, which
could end up with a totally out-of-view one...

Hopefully this fix does not break anything else!

Docs: add note for bmesh face_split_edgenet

Object Mode: Grid: Add a non-hard depth test.

This adds a custom depth test that have the benefits to glitch less and be more visually pleasing.
Downside is that it let the grid pass trough the objects a little.

This effect is done in NDC space so that it counteract the logarithmic depth distribution imprecision (read as it's less visible near the camera but more present far away).

This patch also includes some cleanups.

Fix T53048: OSL Volume is broken in Blender 2.79

Was a mistake in optimization commit which was disconnecting closures and nodes
which does not make sense for volume output.

OSL script we can't ignore and can't currently know in advance if it's a proper
volume shader or not. So we never disconnect OSL nodes from volume output.

This is a good candidate for corrective release.

Cycles: Speedup up tangent space calculation

This patch goes away form using C++ RNA during tangent space calculation which
avoids quite a bit of overhead. Now all calculation is done using data which
already exists in ccl::Mesh. This means, tangent space is now calculated from
triangles, which doesn't seem to be any different (at least as far as regression
tests are concerned).

One of the positive sides is that this change makes it possible to move tangent
space calculation from blender/ to render/ so we will have Cycles standalone
supporting tangent space.

Reviewers: brecht, lukasstockner97, campbellbarton

Differential Revision: https://developer.blender.org/D2810

Cycles: Add utility function to calculate triangle's normal