Blender Git Loki

Nodes: initial abstraction to simplify math node implementations

Currently, implementing a node that supports math operations requires
you to write a long switch statement. The goal of this abstraction
is to reduce the number of these switch statements.

Note, this commit adds new such long switch cases. However, in the upcoming
commits existing math nodes are updated to use this abstraction, resulting in
less code overall.

Geometry Nodes: add utility method to create a dummy attribute reader

This can be used when instead of an actual attribute, a constant value
should be used.

Merge branch 'master' into geometry-nodes

Geometry Nodes: Fix missing node editor redraw for active modifier

When the active modifier changes, or when its node group changes, the
node editor should redraw, because these actions change its context.

Geometry Nodes: Always use the active modifier for shortcuts

Based on discussion with the team, summarized in T82691, it makes sense
to simplify the shortcut behavior and remove the way the shortcuts
currently activate on hover if there is no active modifier. This commit
also removes the behavior of clearing the active modifier when you
click on blank space in the modifier tab.

Geometry Nodes: Make next modifier active when deleting

Previously it was the previous modifier, but this change keeps the index
of the object's active modifier consistent when deleting a modifier.

Merge: fix after merge

This was part of rBe922dd7d8a307c54d49bc01649a12610b022192b.

Merge branch 'master' into geometry-nodes

Add intial work on possion disk distribution

Revert changes to BLI_heap

Geometry Nodes: remove attribute name inputs from Instancer node

The node now assumes that the data is found in the
"Position", "Rotation" and "Scale" attribute.
Those names might change soon.

Geometry Nodes: rename Join to Join Geometry

Geometry Nodes: only output new data from Distribute and Instance nodes

This can be recombined with the original data using a
Join node if necessary.

Cleanup: clang tidy

Fix Compilation Error

GCC showed this as a warning, MSVC as an error.

UI: Improvements to interaction with active modifier

This commit includes these improvements to operators and how they
relate to the active modifier:

- Shortcuts performed while there is an active modifier will affect
only that modifier.
- Clicking anywhere on the empty space in a modifier's panel will make
it active.
- Clicking anywhere in the empty properties space will clear the
active.

These changes require some refactoring of object modifier code. First
is splitting up the modifier property invoke callback, which now needs
to be able to get the active modifier separately from the hovered
modifier for the different operators. Second is a change to removing
modifiers, where there is now a separate function to remove a modifier
from an object's list, in order to handle changing the active. Finally
the panel handler neeeds a small tweak so that this "click in panel"
event can be handled afterwards.

Cleanup: Correct node name in definition function

Geometry Nodes: Initial implementation for attribute math node

This provide a simple implementation for basic math operations. Add,
subtract, multiple, and divide are implemented so far. Domain
interpolation is not implemented yet either.

This commit also adds two "Type" options to the node for choosing
explicitly whether to use an attribute or a float value as one of the
inputs. It is not possible to use two floats as inputs, because that
would be a regular math node.

Some cleanup to avoid some code duplication will come in a future
commit.

Geometry Nodes: new Join node

This node creates a new geometry based on two incoming geometries.
In the future the node ui can be extended to support more than two inputs.

The output geometry will have all the attributes of the inputs.
If both inputs have non-matching set of attributes, missing data is either
interpolated, type cast or zeroed.

Ref T82786.

Geometry Nodes: improve geometry component

* It now knows its own component type.
* Add virtual method to check if the component is empty.
* Add virtual methods to find all attribute names.
* Support adding existing components to a geometry set.