Homer Simpson
9eead719b0
Full project snapshot migrated to new Gitea remote without history: engine, editor, physics, script, examples, tests, docs, and assets. Relicensed from GPLv3 to MIT and updated repo URLs. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
59 lines
2.1 KiB
Rust
59 lines
2.1 KiB
Rust
//! Benchmark for scene world-transform resolution.
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//!
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//! Stage 3 test criterion: a 10,000-entity scene with a 5-level-deep hierarchy
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//! must resolve all world transforms in under 1ms. The `world_transforms_10k`
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//! benchmark builds exactly that scene and measures a full bulk resolve; check
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//! its reported time against the 1ms budget.
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use criterion::{black_box, criterion_group, criterion_main, Criterion};
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use oxide_engine::math::{Transform, Vec3};
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use oxide_engine::scene::{Entity, Scene};
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/// Builds a scene of `total` entities arranged as a `depth`-level hierarchy.
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///
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/// Level 0 holds the roots; each subsequent level's entities are distributed as
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/// children of the previous level, so the tree is `depth` levels deep and the
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/// node count is exactly `total`.
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fn build_scene(total: usize, depth: usize) -> Scene {
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let mut scene = Scene::new();
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let per_level = total / depth;
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let mut previous: Vec<Entity> = Vec::new();
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for level in 0..depth {
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// The last level absorbs any remainder so the count is exact.
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let count = if level == depth - 1 {
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total - per_level * (depth - 1)
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} else {
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per_level
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};
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let mut current = Vec::with_capacity(count);
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for i in 0..count {
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let t = Transform::from_translation(Vec3::new(0.01 * i as f32, 0.02, 0.03));
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let entity = if previous.is_empty() {
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scene.spawn("n", t)
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} else {
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// Spread children across the previous level round-robin.
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scene.spawn_child(previous[i % previous.len()], "n", t)
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};
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current.push(entity);
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}
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previous = current;
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}
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scene
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}
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fn world_transforms_10k(c: &mut Criterion) {
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let scene = build_scene(10_000, 5);
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assert_eq!(scene.len(), 10_000);
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c.bench_function("world_transforms_10k_depth5", |bencher| {
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bencher.iter(|| {
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let resolved = scene.world_transforms();
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black_box(resolved.len())
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});
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});
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}
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criterion_group!(benches, world_transforms_10k);
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criterion_main!(benches);
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