Blender Git Loki

Eevee : TAA : Change post process chain to allow more flexibility

This basically do not use hardware blending and do the blending in the shader.
This will allow neighborhood clamping if we ever implement that.

Eevee: Use fmod instead of floor.

bgl module: extend `gl_buffer_type_from_py_format_char` function to work with more string formats

Only basic types of character codes were being used

Merge branch 'master' into blender2.8

[build_deps.cmd] Turn down logging verbosity to normal.

[msvc] treat C4133 as error instead of a warning to mimic gcc's -Werror=incompatible-pointer-types

as requested by @campbellbarton and @mano-wii

--debug-gpu-shader: Dump GLSL shaders to disk

This is really convenient for development. Either for profiling the
generated shaders or to check if the generated code is correct.

It writes the shaders to the temporary blender session folder.

Cleanup: warning

Vertex/Weight Paint: Use PBVH for painting

2016 GSOC project by @nathanvollmer, see D2150

- Mirrored painting and radial symmetry, like in sculpt mode.
- Volume based splash prevention,
which avoids painting vertices far away from the 3D brush location.
- Normal based splash prevention,
which avoids painting vertices with normals opposite the normal
at the 3D brush location.
- Blur mode now uses a nearest neighbor average.
- Average mode, which averages the color/weight
of the vertices within the brush
- Smudge mode, which pulls the colors/weights
along the direction of the brush
- RGB^2 color blending, which gives a more accurate
blend between two colors
- multithreading support. (PBVH leaves are painted in parallel.)
- Foreground/background color picker in vertex paint

bgl module: Interpret a buffer as a bgl.Buffer

Differential Revision: https://developer.blender.org/D2857

Code refactor: simplify CUDA context push/pop.

Makes it possible to call a function like mem_alloc() when the context is
already active. Also fixes some missing pops in case of errors.

D2830 - 2.8: Fix crash when creating new action

Patch by: Marcelo Mutzbauer (1xundoredo)

Math Lib: Add non-clamped round_* functions

Replace iroundf with round_fl_to_int, add other types

Merge branch 'master' into blender2.8

Eevee: Fix bug with cubemap shadows.

Eevee: Fix broken World probe.

Eevee: TAA: Remove 32 sample limit.

BLI_rand : Make use of BLI_halton and BLI_hammersley

BLI_rand : Add new low-discrepency sequences generator

Eevee : Fix regression : Refraction not working