Blender Git Loki

BMesh: add BMW_ISLAND_MANIFOLD

An island walker that only walks over manifold edges.

Cycles: Add support for single channel float textures on CPU.

Until now, single channel textures were packed into a float4, wasting 3 floats per pixel. Memory usage of such textures is now reduced by 3/4.
Voxel Attributes such as density, flame and heat benefit from this, but also Bumpmaps with one channel.
This commit also includes some cleanup and code deduplication for image loading.

Example Smoke render from Cosmos Laundromat: http://www.pasteall.org/pic/show.php?id=102972
Memory here went down from ~600MB to ~300MB.

Reviewers: #cycles, brecht

Differential Revision: https://developer.blender.org/D1981

BMesh Island Walker: use direct loop access

BMesh: remove exception from face-join function

Callers need to check for NULL, if we need to know exact cause it could be a return arg.

BMesh: boundary walker, skip non-manifold loops

Instead of setting an exception, treat non-manifold edges as boundaries.

BMesh: add check for manifold loop

Cleanup: only use r_ prefix for return args

Cleanup: unused win32 headers

error in last commit

Correct check for tree being in BVH cache

Remove pointer typedef from BVHCache

Used ** arguments unnecessarily,
also replace BLI_linklist_apply with while loop.

Fix crash snapping to mesh with no geometry

Cycles: Use explicit qualifier for single-argument constructors

Almost in all cases we want such constructors to be explicit, there are
exceptions but only in few places.

Fix incorrect FLT_MIN use

Transform Volume rewrite/refactor

Take advantage of the efficiency provided by the snap_context.

Also fixes errors:
- volume snap fails based on view angle (T48394).
- multiple instances of dupli-objects break volume calculation.

BMesh: correct fix for face-join removing attached faces

Fix for inline documentation of FOREACH_NODETREE.

Was missing id macro variable.

Fix for node tree ID tagging in new depsgraph.

Nested node trees are not handled in BKE_main_id_tag_all.

Depsgraph: Add some missing relations

Those cases requires not only geometry component, but also a transform one
to be ready before evaluation can start.

BLI_kdopbvh: Use distance for BLI_bvhtree_ray_cast_all

Pass distance argument so its possible to limit the range we get all hits from.

Other changes:

- Use boundbox test before calling callback, avoids redundant calls.
- Remove meaningless return value.
- Add doc string, explaining purpose of this function.