Blender Git Loki

Cycles: Schedule adaptive sampling filter

Takes care of the logic from the render scheduler. Need to properly
implement it on the PathTrace and PathTraceWork now.

Cycles: Make path tracer aware of adaptive sampling

No functional changes, just piping some information so that it can be
used in the following development.

Also make the scheduler aware of the adaptive sampling, with some
preliminary support of samples alignment.

Cycles: Move AdaptiveSampling to integrator folder

The device_task was the wrong place for it. The new placement makes
it possible to start hooking up the adaptive sampling information to
the PathTrace.

There are some minor changes to make the class fit better into the
new rendering pipeline, also documentation is somewhat improved.

Cycles: Expose adaptive sampling filters via CPUKernels

The change includes moving some lines around, to arrange kernels
in a more clear and grouped way.

The CPUFunction invokation had to be modified to return auto type.
This way it's possible to return value from the kernel. It compiles
here with GCC. Didn't check whether this is something from newer
C++ standards. If so, we can do some declspec magic to deduct the
return type from the function type.

On one hand this is an extra indirection, but on another hand this
brings the following benefits:

- Benefit from microarchitecture optimizations.
- Exposes all kernels in a similar manner.

Cycles: Initial support of adaptive sampling

This change brings back main logic of adaptive sampling, which includes
the following:

- Samples count pass
- Auxiliary buffer which is used to indicate per-pixel sample stopping.

Missing parts of the implementation is the filtering and scaling of the
render passes.

There are further possible improvements, such as ensuring equality of
noise when multiple samples are scheduled on the GPU.

Cycles: Allow early outputs from the integrator initialization

The was never an early output happening in this kernel, so the issue
was never detected yet.

Need to keep path and shadow path next kernels initialized to 0 in
this case, otherwise the kernel scheduling will not terminate the
path. Using path termination call is not possible in its current
implementation by the looks of it, because there is no previous
kernel scheduled yet.

Solved by splitting the state initialization into two parts, allowing
an early output prior to the full initialization or even prior to the
ray initialization.

The thing which is good in this approach is that it also initializes
buffer access in the state, so that the adaptive sampling can access
it in the general manner to perform early output checks.

Cycles: Restore integrator's AA samples update

The AA samples are not communicated from BlenderSync to the integrator.

This is something what should become more explicit or clear: maybe set
AA samples together with diffuse/glossy/etc in the sync, and/or make it
happen from `Session::set_samples()`.

For now restore old style code which happens in `Session::update_scene`
but cover it with comment and do it without condition.

Cycles: Write samples count pass

Done from the path initialization function as it is a single kernel in
which it is known path will be terminated (if path was initialized, it
will be followed along and eventually terminated). So instead of doing
the write in every kernel where path terminates do it in the single
place.

Needed to pass render buffers along, but this is more of a technical
change.

The sample number is always positive, as we no longer have multiple
tiles rendering at the same time. Probably logic somewhere else can
be simplified now.

The pass is only available if the rendering did finish. This is due to
the way how PathTrace communicates passes to Blender side.

Cycles: Remove buffer from KernelWorkTile

Also do minimal changes to adaptive sampling filter kernels to keep
things compiled.

Comment out filtering functions in CUDA device, similar to CPU device.

All this is to prepare a bit less entangled and messy basis for work
related on bringing the adaptive sampling within the new integrator.

cleanup

Spreadsheet: Show data of active node (WIP).

Differential Revision: https://developer.blender.org/D10875

Merge branch 'master' into spreadsheet-active-node

Nodes: separate node name and display name in bNodeTreePath

Previously, `node_name` was rarely actually a name of a node. It is set
correctly as node name in `ED_node_tree_push`. However, later on it
was overwritten by the name of an id data block in `node_draw_space`.

Now, the node_name stays the name of the "parent" node. Whereas
display_name is the name that will be displayed in the breadcrumbs.

With this change, the `node_name` can be used to reconstruct the
actual path from the root node tree to the currently visible tree.

Differential Revision: https://developer.blender.org/D10874

fix

direct data ownership

Cleanup: spelling

Merge branch 'master' into spreadsheet-active-node

Geometry Nodes: add socket value logging capability

The node tree evaluator now calls a callback for every used socket with
its corresponding value(s). Right now the callback does nothing.
However, we can use it to collect attribute name hints, socket values
for debugging or data that will be displayed in the spreadsheet.

The main difficulty here was to also call the callback for sockets in
nodes that are not directly executed (such as group nodes, muted
nodes and reroutes).

No functional changes are expected.

cleanup

Merge branch 'master' into spreadsheet-active-node