Blender Git Loki

Buildbot: Remove CMake cache on all platforms

This way we are always sure that we are using latest ever configuration
without need to manually poke buildbot after doing changes in the building
environment.

Also uncomment code back, was a left-over from some debug.

Cycles: Make CUDA 7.5 officially recommended

This was a hard decision, because going newer CUDA toolkit makes
rendering up to 5% slower. But on another hand, it solves major
speed regressions (up to 30%) with branched path tracing on a
top level cards.

Neither of those regressions have a meaningful and sane workaround
from the code itself.

Toolkit 6.5 could still be used, but it's no longer recommended one.

Fix/workaround static object initialization in gflags

install_deps: final CMake instructions: always update all libs controlled by this script.

Otherwise, switch from local built to system installed libs (once a valid package becomes available)
would be missed...

install_deps: OSD building: disable CUDA/OpenCL backends.

Those are can of worms to support properly (versions mismatch, etc.),
and not used in Blender currently anyway.

Cycles: Don't silence unused macro, remove the macro instead

It's not really handy to silence something unused hoping for it'll be
used in the future. We can end up with quite some silencing then.

Also made this flag which i find rather useless to NOT cause -Werror
in Cycles code.

Fix T47447: Cycles crash when reaching texture limit with 3D textures

Cleanup: unused define warning

Cleanup: OSL style

Some more tweaks to make linking to a shared FFmpeg-3.0 happy

Add missing glLineWidth call

Use high precision for scene scale

Without this its possible to accidentally truncate the value.

Fix T47411: Cycles portals luminance artifacts

When using multiple portals, scene areas behind one of the portals were rendered darker than they should.
The reason for that is a pretty stupid mistake: Since portals are only used at positions that aren't behind them,
only portals that are used should be accounted for in the PDF calculation. That was actually the case, but the final
divide incorrectly divided by the total amount of portals, not the amount of visible ones.

Another issue with areas behind portals was the PDF evaluation function.
The new evaluation code is shorter, simpler and fixes this issue.

Also, the threshold for the distance check was increased to avoid artifacts where portals touch a surface.

Fix OpenCL kernel build errors after recent 3D texture changes.

Fix (harmless) assert in BVH spatial splits with Visual Studio debug builds.

Fix broken ghash performance gtest.

Regression from rB2dba2b3d71d9781bce45. Do not understand why MSVC needs this convoluted
allocation (looks like broken compiler crap?), but at least let's do it correctly!

Cleanup: avoid -Wnarrowing warning

Cycles: Remove back some tweaks for inline policies

While kernel compiles fine, it seems generated binary is not really correct.

Make game engine ready for FFmpeg-3.0 as well

Correct label for simple deform modifier