Blender Git Loki

DRW: Move buffer & temp textures & framebuffer management to DrawManager

This is a necessary step for EEVEE's new arch. This moves more data
to the draw manager. This makes it easier to have the render or draw
engines manage their own data.

This makes more sense and cleans-up what the GPUViewport holds

Also rewrites the Texture pool manager to be in C++.

This also move the DefaultFramebuffer/TextureList and the engine related
data to a new `DRWViewData` struct. This struct manages the per view
(as in stereo view) engine data.

There is a bit of cleanup in the way the draw manager is setup.
We now use a temporary DRWData instead of creating a dummy viewport.

Differential Revision: https://developer.blender.org/D11966

EEVEE: GBuffer: Change layout

This change the gbuffer layout to use more of the hardware to converting
data back and forth. Normals are encoded as two 16 bits components and
colors as R11G11B10F format.

This was motivated by the need of better quality normals. The issue is
that this increase the GBuffer size consequently. In order to balance
this we chose to merge the refraction and Diffuse/SSS data to use the
same buffer. This means we need to stochastically chose one of these
layers (so noise appear). Given that Glass BSDFs are rarely mixed
with Diffuse BSDFs, we think this is a good tradeoff.

adaptive_cloth: Add UI for size_min of static_remesh

adaptive_cloth: implement and run static_remesh()

Sets the same "sizing" for all the `Vert`s of the `AdaptiveMesh` and
then runs `mesh.split_edges()`.

TODO(ish): Add mesh.collapse_edges() within static_remesh()

adaptive_cloth: AdaptiveMesh: split_edges()

Splits edges whose "size" is greater than 1.0

TODO(ish): Need to flip edges of those faces that have been affected
by the split edge operation.

adaptive_cloth: AdaptiveMesh: get_splittable_edge_indices_set()

Gets the maximal independent set of splittable edge indices in the
`AdaptiveMesh`.

adaptive_cloth: AdaptiveMesh: VertData: add flag

Add flag to be able to tag the `Vert`.

adaptive_cloth: AdaptiveMesh: extra data interp

Add interp() function to the extra data of `AdaptiveMesh`

bli: float2x2: linear_blend()

Linearly blend between the 2 matrices.

adaptive_cloth: Mesh elements: get_self_index()

Fix wrong MIS weight with transparent surfaces and volumes, leading to noise

Cleanup: move all MIS weighting to integrator/ module

Merge branch 'master' into curve-nodes-modifier

Merge branch 'master' into cycles-x

GPencil: More cleanup

GPencil: Comment clenaup

GPencil: Remove parenting when the asset is created

The parent cannot be used in the asset.

GPencil: Use cage center as origin for rotation angle

Knife: Better vertex handling for visible measurements

Visual angle measurements for the knife tool did not work well with vertices.
There were lots of buggy cases which this patch solves.
It also cleans up some of the old visual distance and angle measurements code.

Avoid needlessly creating adjacency buffers.