Blender Git Commits

Merge branch 'master' into openvdb

Use reflection BSDF for glossy reflections when roughness is 0.0 to
reduce computational expense and some code cleanup

Code cleanup includes:
- Code style cleanup and removed unused code
- Consolidated code in the bsdf_microfacet_multi_impl.h to reduce
some computational expense

Code Refactor: Creating utility function for updating boundary hulls

Merge remote-tracking branch 'origin/master' into soc-2016-uv_tools

reverting to old IO functions. changes from D2317 produce posixpath, mantaflow save() and load() require string though

Mantaflow: Fix typo in smoke_export_low script.

Fixed cmake option for htc vive in OpenHMD

- Added initial HTC Vive support, still uses complimentary sensor fusion, could drift a bit

- Updated Oculus CV1 support

Removed cordinate frame from OpenHMD Deepoon driver

Own panel for HMD stuff

No need to enable "Views" option anymore now.

Updated OpenHMD to match their latest master (1c984fb)
Adds support for Oculus Rift CV1 and Deepoon E2

Fix warning with WITH_OPENHMD enabled

Fall back to return unit matrix

Fix compiling without WITH_INPUT_HMD

No need to apply HMD rotation in operator anymore

Now done by requesting modelview/projection matrices from OpenHMD.

Use projection matrix from HMD, don't add to Blender's

Cycles: Finish implementing the split kernel for CPU devices

Implements the `data_init` kernel plus a few fixes so that it runs correctly.

The split kernel now works on CPU devices. This means we have the ability to
debug the kernel, get better compiler logs, and have a new device to compare
to, all of which will help in developing and keeping the split kernel
correct. With this implementing branched path tracing, volumes and subsurface
scattering will be much easier.

Even at this point the CPU implementation already paying off by making long
existing bugs in the kernel apparent.

It should be noted that while the kernel works, it is a bit slower than the
mega kernel (~13% with BMW). Will need to investigate whether this is a
bug / implementation issue or if split kernels are simply slower by nature.

Cycles: Add function so each device can specify its ideal local work size

Cycles: Add functions to allocate kernel globals for split kernel

CPU device needs to allocate and free thread specific data, these functions
are used to do that.