Blender Git Loki

GPUViewport: Make Depth texture not depth testable.

GPUMaterial: Make background not transparent

Eevee: Add Bloom post process.

Based on Kino/Bloom v2 - Bloom filter for Unity
MIT license.

Draw Manager: Fix multiple timer query issued for one pass.

Cycles: Implement denoising option for reducing noise in the rendered image

This commit contains the first part of the new Cycles denoising option,
which filters the resulting image using information gathered during rendering
to get rid of noise while preserving visual features as well as possible.

To use the option, enable it in the render layer options. The default settings
fit a wide range of scenes, but the user can tweak individual settings to
control the tradeoff between a noise-free image, image details, and calculation
time.

Note that the denoiser may still change in the future and that some features
are not implemented yet. The most important missing feature is animation
denoising, which uses information from multiple frames at once to produce a
flicker-free and smoother result. These features will be added in the future.

Finally, thanks to all the people who supported this project:

- Google (through the GSoC) and Theory Studios for sponsoring the development
- The authors of the papers I used for implementing the denoiser (more details
on them will be included in the technical docs)
- The other Cycles devs for feedback on the code, especially Sergey for
mentoring the GSoC project and Brecht for the code review!
- And of course the users who helped with testing, reported bugs and things
that could and/or should work better!

Fix crash opening startup.blend as regular .blend (again)

Earlier fix could cause issues and was reverted in rBfc601d8eaa79a7.
Fixed now by avoiding CTX_ call when context hasn't been setup
completely yet.
I think it's fine to assume G.main equals CTX_data_main call at this point.

Fix (harmless) error print with multiple workspaces

Fixes issue reported in https://developer.blender.org/D2451#62155.
Caused by rB8c250c9b73797520.

Fix failing assert on undo

Caused by rB9fa84d640f151 which set the deprecated pointer for forward
compatibility, leading to failling assertion of this pointer being NULL.
We now NULL the pointer again after writing to file.

Merge branch 'blender2.8' into workspaces

Fix unfreed render-layer properties memory after loading file

Would cause pointer to allocated memory to be overridden.
Steps to recreate were:
* Start Blender
* Save
* Open saved .blend
* Close Blender -> should report unfreed memory

Some missing free memory for shaders

Cleanup: use index syntax instead of addition

Harmless but made accessing the first element read strangely.

Merge branch 'blender2.8' into greasepencil-object

Cleanup: use uint/ushort for polyfill2d

Cleanup: use const pointers where possible

Fix PyAPI crash assigning/deleting id-properties

Caused by D113.

Merge branch 'master' into blender2.8

Cleanup: unused return, redundant assignments

PyAPI: Remove bpy.app.handlers.scene_update

This is routinely mis-used to continuously run scripts,
causing performance problems.

This should be replaced with more specific handlers, or possibly timers.
See: T47811

Cleanup: naming