Blender Git Loki

Cleanup: replace deprecated imp -> importlib

Set bAction.chanbase to deprecated

Theme Flatty Light

As discussed, welcome flatty light to master!

Fix: Joining armatures fixes up the drivers accordingly

Finally! At long last, I've gotten this working! This ended up being far trickier
to get right than anticipated; the normal remapping API's cannot be used as-is
as they will just clobber over subtleties whenever datablock changes are involved.
So, for now, we have to duplicate the logic a bit.

WIP: Attempt to get driver links remapped correctly when joining armatures

Now, RNA Paths and driver targets get corrected, but at the expense of this
always happening (i.e. even for those affecting drivers which existed before).

Fix: Joining armatures wasn't updating Action Constraints properly

The code here was still trying to access ancient 2.4x "action channels" to rename
them. Now, this renames the relevant FCurves instead.

Cycles: Fix compilation error with some compilers

Not sure why this was not visible previously, but the change is
logical anyway.

CTests: Add render tests for Cycles

The idea is to use the set of really small images from the lib folder
and run Cycles render on them comparing render output to reference
images in the tests repository.

For sure same thing could become more generic for BI or Freestyle
render engines.

Thanks Campbell for review and code tweaks!

CMake: Auto-detect path to idiff application in FindOpenImageIO.cmake

Not used at this moment, but will be real soon with new ctests.

Quit blender with non-zero exit code if tryign to use non-existing render engine via the command line

Fix T43357: Cycles crash with spatial splits after recent changes

When doing BVH leaf node split we can't rely on leaf size limit from
BVH parameters in case there's spatial split enabled.

This commit basically reverts previous optimization change here which
used stack-allocated memory and uses heap-allocated vector now.

It's possible to boost this code up again by using own allocator.

Cycles: Add assert check to triangle packing

Handy for troubleshooting.

Fix T43120: Cycles mapping node rotation order is different from viewport

Root of the issue goes to the fact that since the very beginning Cycles was
using ZYX euler rotation for mapping shader node but blender was always
using XYZ euler rotation.

This commit switches Cycles to use XYZ euler order and adds versioning code
to preserve backward compatibility.

There was no really nice solution here because either we're ending up with
versioning code or we'll need to deal with all sort of exceptions from blender
side in order to support ZYX order for the mapping node. The latest one is
also creepy from the other render engines points of view -- that might break
compatibility with existing bindings or introduce some extra headache for them
in the future.

This could also become a PITA for us with need of supporting all sort of weird
and wonderful exceptions in the refactored viewport project.

NOTE: This commit breaks forward compatibility, meaning opening new files in
older blender might not give proper result if Mapping node was used.

Also, libraries are to be re-saved separately from the scene file, otherwise
versioning code for them wouldn't run if scene file was re-saved with new
version of blender.

Reviewers: brecht, juicyfruit, campbellbarton

Reviewed By: campbellbarton

Differential Revision: https://developer.blender.org/D973

Cleanup / Cycles: Code de-duplication for graph node relinking.

Differential Revision: https://developer.blender.org/D1018

Expose shading node shading compatibility to the RNA

This way it is possible to probe shading compatibility of a given node from
python, making things like versioning code much easier to perform.

it's only valid for shading nodes, for other nodes the property also exists
but reads as an empty enum.

To access this compatibilities:

node.shading_compatibility

Fix: Audaspace threw an exception for files it could not open.

Docs: touch ups in the bge.render doc introduction

bge.render.getStereoEye() and bge.types.LEFT_EYE/RIGHT_EYE

This function allows the user to run specific code for each of the
rendered stereoscopic eyes in the Game Engine.

The initial use case is to set the camera projection matrix in
a scene.pre_draw callback function for each eye, to be used in VR
(Virtual Reality) installations.

Reviewed by Mitchell Stokes and Campbell Barton, thank you guys.

Sample Test Python Script:
"""
import bge
import bgl
import blf

def init():
"""init function - runs once"""
scene = bge.logic.getCurrentScene()
scene.post_draw.append(write)

def write():
"""write on screen - depending on the eye"""
width = bge.render.getWindowWidth()
height = bge.render.getWindowHeight()

# OpenGL setup
bgl.glMatrixMode(bgl.GL_PROJECTION)
bgl.glLoadIdentity()
bgl.gluOrtho2D(0, width, 0, height)
bgl.glMatrixMode(bgl.GL_MODELVIEW)
bgl.glLoadIdentity()

eye = bge.render.getStereoEye()

if eye == bge.render.LEFT_EYE:
blf.position(0, (width * 0.2), (height * 0.3), 0)
blf.size(0, 40, 72)
blf.draw(0, "Left")

else: # bge.render.RIGHT_EYE:
blf.position(0, (width * 0.7), (height * 0.3), 0)
blf.size(0, 40, 72)
blf.draw(0, "Right")
"""

error in last commit (missed in review)

Outliner: use enum for outliner_data_operation()

No functional change, D997 by @lichtwerk