[makspll]

The reactive ui in Rune: the inventory test ported (assets/tests/reactive_ui/inventory_rune, same steps as the Lua one, including the reload) and benchmarks (Components Rune / Template Rune variants of every scenario, with the rune feature).

Nothing in the crate is specific to a language, what Rune needed went into the PRs below: names which are not Rune keywords (when, selected, #714) and dependency lists (#724), since Rune closures handed to BMS can't capture signals or entities.

fn slot(name, entity, is_selected, selected) {
    let ui = import_namespace("reactive_ui");
    let item = ui.watch(entity, state()["Item"]);
    ui.node(#{
        name: `slot_${name}`,
        background_color: ui.when(ui.selected(is_selected, name), "#ffcc00", "#333333"),
        on_click: [|selected, name| selected.set(name), selected, name],
    }, [
        ui.text(#{ text: ui.format("x{}", [ui.path(item, "data.count")]) }),
    ])
}

Rune behaviours the scripts work around (for the docs):

• a closure ending in a bare local returns nothing: return out;
• a string can't be compared with (): match
• if without else as the last expression is ()
• definitions are kept in state() and defined once in main: calling ui.component again re-renders its instances

First numbers (one round, same machine as the Lua numbers of #725):

bench	Components Rune	Template Rune	Closures Lua	Template Lua
inventory mount or unmount 200	4.35 ms	0.83 ms	1.78 ms	0.90 ms
inventory search	3.68 ms	0.79 ms	1.49 ms	0.79 ms
inventory add or remove one	218 µs	178 µs	125 µs	173 µs
inventory select	37 µs	51 µs	22.8 µs	24.4 µs
inventory item count	5.1 µs	5.9 µs	7.7 µs
health tick	8.7 µs	8.6 µs

Components cost 2.4x what they do in Lua (every function call passes its dependencies, and Rune's calls into BMS are slower), templates cost the same in both: no script code runs per row.

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
assets/macro_benchmarks/reactive_ui/inventory.rn	Unsupported file format
assets/tests/reactive_ui/inventory_rune/inventory.rn	Unsupported file format
assets/tests/reactive_ui/inventory_rune/scenario.bmsscenario	Unsupported file format
benches/benchmarks.rs	0% smaller

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Bencher Report

Project	Bevy Scripting
Branch	agent/reactive-ui-rune
Testbed	linux-gha

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