iris-aiandClaude Opus 5
7c50a3e51b
`dp` is coming, and then `abs` says which of the two it is not. The component has always been a pixel count, so the name that admits it is the one that leaves room for a second unit beside it. Mechanical: the field on `Len` and `UiScalar`, their constructors, `to_abs`/`get_abs`, the matching WGSL struct member and the locals composing it. Field order and types are unchanged, so the `Pod` layout the shader reads is the same bytes. `f32::abs` is untouched. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
44 lines
1.5 KiB
Rust
44 lines
1.5 KiB
Rust
//! What re-placing a subtree costs per frame, as a load for a counter rather
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//! than a check. A span of 200 fixed-height rows, five primitives each, with
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//! the row above them changing height every frame, so every row below is
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//! offered a box the same shape somewhere else.
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//!
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//! cargo test --release --test replace_cost -- --ignored
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//! perf stat -e instructions:u target/release/.../replace_cost-* --ignored
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//!
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//! Wall time is the wrong number here; see `draw_cost.rs`. Measured on
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//! 2026-09-14 at 1.98M instructions per frame, against 2.38M for rewriting
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//! each row's regions instead and 7.13M for redrawing them.
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use iris::harness::Harness;
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use iris::prelude::*;
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const ROWS: usize = 200;
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const FRAMES: usize = 200;
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#[test]
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#[ignore = "measurement, not a check"]
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fn replacing_rows_every_frame() {
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let mut h = Harness::new((1920, 1200));
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let first = rect(Color::RED).height(40).add(&mut h.rsc);
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let mut span = Span::empty(Dir::DOWN);
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span.push(first.add_strong(&mut h.rsc));
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for i in 0..ROWS {
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let row = (
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rect(Color::BLUE.darker(i as f32 / (ROWS * 2) as f32)),
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rect(Color::GREEN).pad(2),
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wtext("row").size(16).pad(2),
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)
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.span(Dir::RIGHT)
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.pad(4)
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.height(40)
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.add(&mut h.rsc);
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span.push(row.add_strong(&mut h.rsc));
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}
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h.set_root(span);
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for i in 0..FRAMES {
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h.rsc[first].y = Some(Len::px(40.0 + (i % 2) as f32));
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h.frame();
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}
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}
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