Blender Git Commits

Cleanup: use proper RNA struct type for ListBase type
(otherwise all code using RNA has to link DNA_listbase.h, not clean at all!).

ID-Remap - Step one: core work (cleanup and rework of generic ID datablock handling).

This commit changes a lot of how IDs are handled internally, especially the unlinking/freeing
processes. So far, this was very fuzy, to summarize cleanly deleting or replacing a datablock
was pretty much impossible, except for a few special cases.

Also, unlinking was handled by each datatype, in a rather messy and prone-to-errors way (quite
a few ID usages were missed or wrongly handled that way).

One of the main goal of id-remap branch was to cleanup this, and fatorize ID links handling
by using library_query utils to allow generic handling of those, which is now the case
(now, generic ID links handling is only "knwon" from readfile.c and library_query.c).

This commit also adds backends to allow live replacement and deletion of datablocks in Blender
(so-called 'remapping' process, where we replace all usages of a given ID pointer by a new one,
or NULL one in case of unlinking).

This will allow nice new features, like ability to easily reload or relocate libraries, real immediate
deletion of datablocks in blender, replacement of one datablock by another, etc.
Some of those are for next commits.

A word of warning: this commit is highly risky, because it affects potentially a lot in Blender core.
Though it was tested rather deeply, being totally impossible to check all possible ID usage cases,
it's likely there are some remaining issues and bugs in new code... Please report them! ;)

Review task: D2027 (https://developer.blender.org/D2027).
Reviewed by campbellbarton, thanks a bunch.

Cycles: Fix crash with Environment Texture and OSL

In the OSL node compilation code for the Environment Texture, is_linear was used as a socket.
However, there was no socket for it, which caused Blender to crash.
Adding a socket doesn't really make sense since it's an internal value and not a parameter
of the node, so it now just uses the variable directly.

EditMesh: Avoid creating deform-vert layer every redraw

Getting a new edit-derived-bmesh was always creating a deform-vert array, even when it wasn't needed.
Since this was called on redraw, in many cases it was doing it unnecessarily.

Now pass in a custom-data mask and only fill in deform-verts when needed.

Gives noticeable drawing speedup (~10-30% here).

Merge branch 'master' into blender2.8

Conflicts:
source/blender/blenloader/intern/readfile.c
source/blender/editors/physics/particle_edit.c

Cleanup: style

Cleanup: remove unused Image space curves

Caused leaks reading old files, was read/written but not freed,
remove since its unused.

readfile: use BLI_endian_switch

Replace inline endian switching

Remove module reloading for preview operators

This can be kept on file level but best keep out of operator functions.

writefile: use const for old address

Also remove temp preview overwriting.

Docs: use doxy formatting for readfile

Fix T48703: Name inconsistency w/ area maximize/fullscreen

Name operator based on default behavior.

T48694: fix bge.texture.Texture.refresh() documentation

first parameter is mandatory and must be a bool indicating if the image
source should be refreshed after updating the texture.

Fix null-pointer free

Own error in recent decimeter commit

Fix T48700: Crash when window creation fails

Check if Python is initialized before calling BPY_python_end.

Fix T48698: Rays from SSS act as diffuse for normal objects but have an undefined type for lamp objects

The problem here was that there are five path types internally (diffuse, glossy, transmission, subsurface and volume scatter), but subsurface isn't exposed to the user.
This caused some weird behaviour - if all four types are disabled on the lamp, Cycles doesn't even try sampling it, but if any type was active, the lamp would illuminate
the cube since none of the options set subsurface to zero.
In the future, it might be reasonable to add subsurface visibility as an option - but for now the weird and inconsistent behaviour can be fixed simply by setting both
diffuse and subsurface to zero if the user disables diffuse visibility.

Cleanup: hide debug print behind proper debug defines instead of using comments...

Fix T48412: Blender 2.77a crashes on Undo in some specific multi-level linked libraries cases.

Good old dead-brain stupid error when iterating over a linked list from which you remove some items...

Fix for string buffer overflow in DepsNode identifiers.

Layer flags can go up to 2^n-1 for n layers, requiring *at least* 9 chars + 1 terminator for 20 layers.

Fix T48697: Brush curve-stroke snaps strangely

Support Snapping screen-space 2d curves, (was applying world-space coords in screen-space).
Also show snap settings in header.