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Write an attribute under a name the graph supplies

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`Named<X>` in parameter position declares where a placeholder's name is
wired, and the macro gives that input constant text; `Attr<Named<X, V>>`
in the return writes under it. The kernel is handed the bare placeholder,
since the name is spent resolving the layout and a folded offset is all
the write needs, so the hot path matches a marker node's exactly.

A name-generic write names its value type through the wired generic,
which only an implementations row resolves, so those nodes emit their
layout meta per row rather than sharing one across rows.

`write_attribute` is the catalog's set half, restoring the identifier
master's documents carry with its input positions. Its name input is a
constant, so those documents resolve without migration, and the reset
marker that stood in for the missing node retires with it.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Dennis Kobert
2026-09-09 09:26:17 +00:00
parent 348e9022a6
commit 9b92edc0e9
10 changed files with 363 additions and 34 deletions
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21
node-graph/nodes/graphic/src/graphic.rs
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@@ -1,4 +1,4 @@
use core_types::attribute::{Attr, EditorLayerPath, Transform as TransformAttr};
use core_types::attribute::{Attr, EditorLayerPath, Name0, Named, Transform as TransformAttr, WireValue};
use core_types::bounds::{BoundingBox, RenderBoundingBox};
use core_types::extent::{ExtentIn, LevelIn, ListIn, ValueIn};
use core_types::gpoll::{Extent, GPoll, GraphError, Interrupt, Level};
@@ -368,6 +368,25 @@ pub fn stamp_layer_path<'e, T>(ctx: impl Ctx + ExtractArena<'e>, element: T, pat
Ok((element, Attr(parked.as_slice())))
}
/// Writes `value` onto each lane under the attribute `name` names. The name is
/// constant text the compiler folds into the layout when the graph compiles, so
/// the write costs exactly what a marker node's does; a name that is not
/// constant is refused there rather than resolved here.
#[node_macro::node(category("Attributes: Write"))]
pub fn write_attribute<'e, T, V: WireValue>(
ctx: impl Ctx + ExtractArena<'e>,
content: T,
/// The attribute name, which the compiler folds and the kernel never reads.
_name: Named<Name0>,
#[implementations(f64, u32, u64, bool, DVec2, DAffine2, Color, Vec<NodeId>, String)] value: V,
) -> Result<(T, Attr<'e, Named<Name0, V::Row>>), Interrupt> {
let parked = value.park(ctx.arena()).ok_or(GraphError {
kind: core_types::gpoll::ErrorKind::ArenaExhausted,
trace: Vec::new(),
})?;
Ok((content, Attr(parked)))
}
/// Joins two levels of the same type, the base's lanes followed by the new's.
#[node_macro::node(category("General"), extent(extend_extent))]
pub fn extend<T>(