Blender Git Loki

Cycles: Fix correlation issues in certain cases

There were two cases where correlation issues were obvious:

- File from T38710 was giving issues in 2.78a again
- File from T50116 was having totally different shadow between
sample 1 and sample 32.

Use some more simplified version of CMJ hash which seems to give
nice randomized value which solves the correlation.

This commit will break all unit test files, but it's a bug fix
so perhaps OK to commit this.

This also fixes T41143: Sobol gives nonuniform noise

Proper science paper about hash function is coming.

Reviewers: brecht

Reviewed By: brecht

Subscribers: lukasstockner97

Differential Revision: https://developer.blender.org/D2385

Fix T50075: Assert during debug render of hair_geom_transmission.blend

Cycles: Pass extra array size argument to builtin image pixels functions

This is a way to avoid possible memory corruption when render threads works
in parallel with UI thread.

Not guarantees complete safe, but makes things easier to check anyway.

Fix T50104, Race condition in SVMShaderManager::device_update_shader

Cycles: Avoid divisions by zero in volume sampling code

Was giving huge artifacts in the barber shop file here in the studio,

Maybe not fully optimal solution, but committing it for now to have
closer look later.

Fix T50100: Cycles SeparateRGBNode Red socket defined wrong

Spotted by David (bocs), thanks!

Cycles: Fix strict compilation warnings

Fix Cycles device backwards compatibility error if device type is unavailable.

Fix spelling in Cycles distance culling description.

Cycles: Fix strict compilation warnings

Should be no functional changes.

Fix T50034: Blender changes processor affinity unauthorized

Cycles: Fix re-definition of some functions on x32 arch

Cycles: Another attempt to fix compilation on 32bit Linux

Cycles: Attempt to fix 32bit buildbot builds after recent commit

Cycles: Implement texture size limit simplify option

Main intention is to give some quick way to control scene's memory
usage by clamping textures which are too big. This is really handy
on the early production stages when you first create really nice
looking hi-res textures and only when it all works and approved
start investing time on optimizing your scene.

This is a new option in Scene Simplify panel and it acts as
following: when texture size is bigger than the given value it'll
be scaled down by half for until it fits into given limit.

There are various possible improvements, such as:

- Use threaded scaling using our own task manager.

This is actually one of the main reasons why image resize is
manually-implemented instead of using OIIO's resize. Other
reason here is that API seems limited to construct 3D texture
description easily.

- Vectorization of uchar4/float4/half4 textures.

- Use something smarter than box filter.

Was playing with some other filters, but not sure they are
really better: they kind of causes more fuzzy edges.

Even with such a TODOs in the code the option is already quite
useful.

Reviewers: brecht

Reviewed By: brecht

Subscribers: jtheninja, Blendify, gregzaal, venomgfx

Differential Revision: https://developer.blender.org/D2362

Cycles: Attempt to fix compilation error on ppc64el

There is some define conflict between system headers and clew,
so delay include of clew.h as much as possible.]

This is something which needed to be done in the code before
the refactor, hopefully such change will still work.

Cycles: Don't shadow loop variable

Cycles: add basic backwards compatibility for device selection, move to System tab.

For the multi-GPU case users still have to reconfigure the devices they want to use.

Based on patch from Lukas Stockner.

Differential Revision: https://developer.blender.org/D2347

Cycles: refactor culling code into utility class.

Cycles: distance culling for objects.

This can be used together with camera culling to keep nearby objects visible in
reflections, using a minimum distance within which objects are visible. It is
also useful to cull small objects far from the camera.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D2332