//! What remapping a subtree costs per frame, as a load for a counter rather
//! than a check. A span of 200 fixed-height rows, five primitives each, with
//! the row above them changing height every frame, so every row below is
//! offered a box the same shape somewhere else.
//!
//!     cargo test --release --test replace_cost -- --ignored
//!     perf stat -e instructions:u target/release/.../replace_cost-* --ignored
//!
//! Wall time is the wrong number here; see `draw_cost.rs`.

use iris::harness::Harness;
use iris::prelude::*;

const ROWS: usize = 200;
const FRAMES: usize = 200;

#[test]
#[ignore = "measurement, not a check"]
fn remapping_rows_every_frame() {
    let mut h = Harness::new((1920, 1200));
    let first = rect(Color::RED).height(40).add(&mut h.rsc);
    let mut span = Span::empty(Dir::DOWN);
    span.push(first.add_strong(&mut h.rsc));
    for i in 0..ROWS {
        let row = (
            rect(Color::BLUE.darker(i as f32 / (ROWS * 2) as f32)),
            rect(Color::GREEN).pad(2),
            wtext("row").size(16).pad(2),
        )
            .span(Dir::RIGHT)
            .pad(4)
            .height(40)
            .add(&mut h.rsc);
        span.push(row.add_strong(&mut h.rsc));
    }
    h.set_root(span);
    for i in 0..FRAMES {
        h.rsc[first].y = Some(Len::px(40.0 + (i % 2) as f32));
        h.frame();
    }
}