Blender Git Loki

Code refactor: move more memory allocation logic into device API.

* Remove tex_* and pixels_* functions, replace by mem_*.
* Add MEM_TEXTURE and MEM_PIXELS as memory types recognized by devices.
* No longer create device_memory and call mem_* directly, always go
through device_only_memory, device_vector and device_pixels.

Code refactor: use device_only_memory and device_vector in more places.

Code refactor: store device/interp/extension/type in each device_memory.

Code refactor: pass device to scene, check OSL with device info.

Fix T53141: Assert when using transformation in new 3D View editor

Was actually possible to invoke this assert failure in two ways:
* Transforming in newly created 3D View (like described in the report).
* Transforming in newly appended workspace from default workspaces.blend. Issue was that default workspaces.blend was saved in 2.8.1, but in a branch state that didn't include the transform-orientation changes. So versioning code wouldn't run when needed.

Note that files saved with this bug will still cause the assert to
fail. Can be ignored then.

This is not related to manipulators (as suggested in the report).

Refactor: Move rna_scene.c layer/collection to rna_layer.c

rna_scene.c was getting way too big with data that was related to
DNA_layer_types.h.

I tried doing it earlier, but failed. But now with the new changes I think it's
better to do this sooner than later.

Fix OpenGL extension report in system info operator.

VSE: draw grid lines at every second

Was hard-coded to 25 frames.

D2893 by @jooert

Docs: improve bmesh exception message

Suggested in T53131

Merge branch 'master' into blender2.8

Correct gtest error in recent beautify change

Cleanup: Remove unused function declaration

Merge branch 'master' into blender2.8

Polyfill Beautify: half-edge optimization

Was using an edge hash for triangle -> edge lookups,
updating triangle indices for each edge-rotation.

Replace this with half-edge which can rotate edges much more simply,
writing triangles back once the solution has been calculated.

Gives ~33% speedup in own tests.

Code refactor: avoid some unnecessary device memory copying.

Code refactor: simplify image device memory allocation.

Fix issue with resumable rendering in recent changes.

Cycles: disable progressive refine if denoising or save buffers is used.

Progressive refine undoes memory saving from save buffers, so enabling
both does not make much sense. Previously enabling progressive refine
would disable denoising, but it should be the other way around since
denoise actually affects the render result.

Includes some code refactor for progressive refine render buffers, and
avoids recomputing tiles for each progressive sample.

Cycles: combined CPU + GPU rendering support.

CPU rendering will be restricted to a BVH2, which is not ideal for raytracing
performance but can be shared with the GPU. Decoupled volume shading will be
disabled to match GPU volume sampling.

The number of CPU rendering threads is reduced to leave one core dedicated to
each GPU. Viewport rendering will also only use GPU rendering still. So along
with the BVH2 usage, perfect scaling should not be expected.

Go to User Preferences > System to enable the CPU to render alongside the GPU.

Differential Revision: https://developer.blender.org/D2873

Move & rename uiLayoutOperatorButs to interface_templates.c