Blender Git Loki

Cycles: Moved the box filter for adaptive sampling to separate file

Merge branch 'master' into filebrowser_redesign

Initially split filename and directory-path into two regions

Cycles: Small fixes for adaptive sampling

Ccyles: Added adaptive sampling box filter to OpenCL mega kernel.

Ccyles: Added adaptive sampling box filter to CUDA.

Cycles: Added adaptive sampling support for AOVs

Cycles: Improve adaptive sampling with split kernel

Cycles: Added passes support for adaptive sampling

Support for denoising passes still missing.

Cycles: Fixed build errors with gcc

Cycles: Disabling adaptive sampling for CMJ and Sobol

Only Progressive Multi Jitter has the properties we need for
adaptive sampling, so disable it for other sampler types.

Cycles: Improved scrambling of PMJ sequence

Pixar notes that progressive multi-jittering doesn't work that well
with Cranley-Patterson rotation and suggests random digit scrambling
instead.

Cycles: Fixed some more stupid bugs in the PMJ02 sampler.

Cycles: Fixed stupid typo in PMJ02 generator.

Cycles: Fixed OpenCL build.

Cycles: Made PMJ sampler compile on Windows

Cycles: Added random shuffling to PMJ generation.

Progressive Multi-Jittered sequences still had some correlations between dimensions.
Now there's some added random permutation for higher dimensions.

Cycles: Moved adaptive rendering to use PMJ sampler.

Cycles: Added Progressive Multi-Jittered Sampling.

Cycles: Updated adaptive sampling error metric.