Blender Git Loki

Cleanup: redundant 'break', minor edits

Cleanup: remove unused bmesh iterator

Fix T46818, crash with Glossy node on Windows.

Cycles: Add Blackman-Harris filter, fix Gaussian filter

This commit adds the Blackman-Harris windows function as a pixel filter to Cycles. On some cases, such as wireframes or high-frequency textures,
Blackman-Harris can give subtle but noticable improvements over the Gaussian window.
Also, the gaussian window was truncated too early, which degraded quality a bit, therefore the evaluation region is now three times as wide.
To avoid artifacts caused by the wider curve, the filter table size is increased to 1024.

Reviewers: #cycles

Differential Revision: https://developer.blender.org/D1453

Fix T46807: image/clip/sound load has one user

Loading data from Python gave it one user (unlike 'new' which has zero).

Cycles / Shader graph: Fallback to Sharp closures for very small roughness.

We fallback to Sharp closures for Glossy, Glass and Refraction nodes now, in case the Roughness input is disconnected and 0 (< 1e-4f to be exact).
This way we gain a few percentages of performance, in case the user did not manually set the closure type to "Sharp" in the UI.

Sharp will probably be removed from the UI as a followup, not needed anymore with this internal optimization.

Original idea by Lukas Stockner(Differential Revision: https://developer.blender.org/D1439), code implementation by myself.

Cleanup: Add some notes in code for upcoming graph simplification process.

Cycles: Add utility functions to get a ShaderInput / ShaderOutput by name.

BMesh: simplify calculating grid edge loops

Correct recent commit

RNA: reuse axis enum

Cleanup: editor api naming

- use ED_ prefix for api calls
- use ED_*_select_pick for mouse selection (was already done in parts)

Fix mixup w/ wmOperator/BMOperator flag

BMesh: symmetry aware decimate

Support for decimating while maintaining symmetry on a single axis.

KDTree: add BLI_kdtree_range_search_cb

This performs a range search on the kdtree, running a callback instead of allocating an array.

Allows the caller to perform extra checks in the case of overlap,
avoids redundant array allocations, since caller can handle matches.

Cleanup: kdtree: use sq suffix for squared dist

KDTree: store node references as ints (were pointers)

Fix for previous own commit (logical error - I hate bash).

Install_deps.sh: More attempt to fix building OSL on newer distro.

Now it looks like our version of OSL is not compatible with OIIO 1.5... sigh...

Fix (unreported) install_deps.sh --force-openexr option not working.