Blender Git Loki

Merge branch 'blender2.8' into greasepencil-object

More cleanup & co, also make invalid normals checks more coherent.

Checks for invalid normals was rather inconsistent, sometimes even
missing, trying to fix that.

Cycles: Added NULL pointer check

Merge branch 'master' of git.blender.org:blender into cycles_texture_cache

Try to fix naming of new editnormals ops, and some optimizations.

Some operators were using just 'normals', others 'lopp normals', others
'custom normals'... For now, decided to tick to just 'normals', should
we decide this is too confusing with vnors, I'd rather go to 'custom
normals'.

Also did some cleanup/simplification/optimization in split/merge normals code.

Heavy refactor of 'Point To' editing normals tools.

Core code remains the same, but UI/UX was quiet deeply changed:
* Some fixes in core code (like missing normalization of new normal in
spherize case), as well as some optimizations (reducing amount of vector
operations per affected normals) and cleanup/simplifications.
* Moving modal part of the op closer to moder 'state of the art' Blender
code, mainly:
** Use a modal keymap instead of hard-coded shortcuts.
** Use of proper header message generator extracting shortcuts from
modal keymap.
** Get rid of odd 'callback' function stuff for 'point to mouse', this
can be handled much more simply directly in main modal function.
** Adding some more keymap shortcuts (to temporarily reset normals, to
toggle invert, aligned and spherize options...).
** Do not immediately finish when selecting 'point to pivot/object/etc.',
keep consistent behavior requiring an explicit validation. This also
makes it possible to cancel after seeing effects of changes, or to try
another option, go back and forth between original and changed versions,
etc.
* Fixed memleak in case one would close Blender while modal op was
running (we need to define cancel operator callback for that case).

Note that we could (should?) go further still, adding ways to edit
spherize strength, even with some numinput. We could also add an option
to handle target value as global (current case) or local coordinates.
And so on. For now that will do though.

Fix broken UI code after recent refactor.

Merge branch 'blender2.8' into greasepencil-object

Prepare eraser icon to use different images

The code is ready to change the icon for each type of eraser, but as it's not decided yet, we keep the same image in all of them while we decide new design.

Merge branch 'master' into soc-2017-normal-tools

Move mode type check before set mode

The mode must be verified for this object type before apply new mode.

More changes in object mode switch

The outliner does not need special code.

Mode change still need more work, because in some situations, still the old mode remains activated.

UI: Move brush mode to separated panel

This option has been moved to a separated panel because is too disruptive to have in the main brush panel.

Maybe in the future must be moved to new location, but we put here while we found a better place.

UI: Change Pin icon location

Fix error using different eraser modes

If the bursh was eraser, the brush was not using the eraser mode.

fix legacy wturbulence

windows will not compile with issue - only warning on linux

UI: Define pin icon for default eraser

Using pin button keep UI consistency better than a checkbox.

Merge branch 'blender2.8' into greasepencil-object

Avoid drawing with Eraser brush

If the current brush is eraser and try to draw, cancel the operator.

This could be activated with the D key and must be forbidden.

Implement brush eraser quick switch

This eraser switch works very similar to smooth sculpt brush in object sculpt mode.

When the user press Ctrl, the current drawing brush is replaced by the default eraser brush while hold the key.

After release the override key, the brush back to the drawing brush.