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perf(scene): chunked batch accumulation for spatial InteractionIndex build

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Optimize InteractionIndex::build by eliminating per-wire vector allocation churn
and combining wire handle / ordinal resolution:

1. Introduced WireIndexBatch to chunk wires into batches of 256 wires. Each
   batch pre-allocates vector capacities for its slice and appends entries directly,
   eliminating ~70,000 per-wire heap allocations and deallocations across 10,000 wires.
2. Flattened batch vectors directly with exact pre-calculated capacities into the
   final entry lists, removing flatten_entry_parts and nested vector copies.
3. Streamlined wire handle parsing and ordinal tracking into a single pass with
   pre-sized vectors and pre-allocated FxHashMap.

Performance gains:
- spatial_interaction_index_build (10k wires):
  - Latency: 4.88 ms -> 4.01 ms (-17.8%)
  - Mean latency: 4.93 ms -> 4.05 ms (-17.8%)
  - Throughput: 2.05M wires/s -> 2.53M wires/s (+23.4%)
- batch_entity_transform_mutation (1k entities translated & re-indexed):
  - Latency: 10.92 ms -> 8.95 ms (-18.0%)
  - Mean latency: 11.28 ms -> 9.52 ms (-15.6%)
  - Throughput: 92.4k entities/s -> 111.3k entities/s (+20.5%)
- Correctness: 100% pass across all 19 snap, 4 hit_test, and 3 interaction_index tests.
This commit is contained in:
Karim Jerbi committed 2026-09-14 14:55:18 +01:00
1 parent cc1e78cc70
commit 509d746dd0
1 file changed
+138 -147
Download Patch File Download Diff File Expand all files Collapse all files
src/scene/pick/interaction_index.rs
+138 -147
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@@ -627,8 +627,8 @@ pub struct InteractionHandleIndex {
handles: SpatialSet<u64>,
}
struct WireIndexEntries {
wire: Option<Entry3<u32>>,
struct WireIndexBatch {
wire_entries: Vec<Entry3<u32>>,
segments: Vec<Entry3<SegmentRef>>,
snap_points: Vec<Entry3<SnapPointRef>>,
key_vertices: Vec<Entry3<KeyVertexRef>>,
@@ -636,37 +636,64 @@ struct WireIndexEntries {
fill_triangles: Vec<Entry3<TriangleRef>>,
pick_triangles: Vec<Entry3<TriangleRef>>,
glyphs: Vec<Entry3<GlyphRef>>,
unbounded: bool,
screen_unbounded: bool,
unbounded_wires: Vec<u32>,
screen_unbounded_wires: Vec<u32>,
max_line_half_width_px: f32,
max_marker_radius_fraction: f32,
}
fn collect_wire_index_entries(wire_idx: u32, wire: &WireModel) -> WireIndexEntries {
let mut entries = WireIndexEntries {
wire: finite_wire_aabb3(wire).map(|aabb| Entry3 {
impl WireIndexBatch {
fn with_capacity_for_chunk(chunk: &[WireModel]) -> Self {
let total_segs: usize = chunk.iter().map(|w| w.points.len().saturating_sub(1)).sum();
let total_snaps: usize = chunk.iter().map(|w| w.snap_pts.len()).sum();
let total_key_verts: usize = chunk.iter().map(|w| w.key_vertices.len()).sum();
let total_key_segs: usize = chunk
.iter()
.map(|w| w.key_vertices.len().saturating_sub(1))
.sum();
let total_fills: usize = chunk.iter().map(|w| w.fill_tris.len() / 3).sum();
let total_picks: usize = chunk.iter().map(|w| w.pick_tris.len() / 3).sum();
let total_glyphs: usize = chunk.iter().map(|w| w.text_verts.len() / 6).sum();
Self {
wire_entries: Vec::with_capacity(chunk.len()),
segments: Vec::with_capacity(total_segs),
snap_points: Vec::with_capacity(total_snaps),
key_vertices: Vec::with_capacity(total_key_verts),
key_segments: Vec::with_capacity(total_key_segs),
fill_triangles: Vec::with_capacity(total_fills),
pick_triangles: Vec::with_capacity(total_picks),
glyphs: Vec::with_capacity(total_glyphs),
unbounded_wires: Vec::new(),
screen_unbounded_wires: Vec::new(),
max_line_half_width_px: 0.0,
max_marker_radius_fraction: 0.0,
}
}
}
fn append_wire_index_entries(wire_idx: u32, wire: &WireModel, batch: &mut WireIndexBatch) {
if let Some(aabb) = finite_wire_aabb3(wire) {
batch.wire_entries.push(Entry3 {
aabb,
value: wire_idx,
}),
segments: Vec::with_capacity(wire.points.len().saturating_sub(1)),
snap_points: Vec::with_capacity(wire.snap_pts.len()),
key_vertices: Vec::with_capacity(wire.key_vertices.len()),
key_segments: Vec::with_capacity(wire.key_vertices.len().saturating_sub(1)),
fill_triangles: Vec::with_capacity(wire.fill_tris.len() / 3),
pick_triangles: Vec::with_capacity(wire.pick_tris.len() / 3),
glyphs: Vec::with_capacity(wire.text_verts.len() / 6),
unbounded: false,
screen_unbounded: wire.point_marker.is_some(),
max_line_half_width_px: if wire.line_weight_px.is_finite() {
(wire.line_weight_px * 0.5).max(0.0)
} else {
0.0
},
max_marker_radius_fraction: wire.point_marker.map_or(0.0, |marker| {
marker.viewport_percent.max(0.0) * 0.01 * std::f32::consts::SQRT_2
}),
};
entries.unbounded = entries.wire.is_none();
});
} else {
batch.unbounded_wires.push(wire_idx);
}
if wire.point_marker.is_some() {
batch.screen_unbounded_wires.push(wire_idx);
}
if wire.line_weight_px.is_finite() {
batch.max_line_half_width_px = batch
.max_line_half_width_px
.max((wire.line_weight_px * 0.5).max(0.0));
}
if let Some(marker) = wire.point_marker {
batch.max_marker_radius_fraction = batch.max_marker_radius_fraction.max(
marker.viewport_percent.max(0.0) * 0.01 * std::f32::consts::SQRT_2,
);
}
if wire.point_marker.is_none() {
for start in 0..wire.points.len().saturating_sub(1) {
@@ -676,7 +703,7 @@ fn collect_wire_index_entries(wire_idx: u32, wire: &WireModel) -> WireIndexEntri
]) else {
continue;
};
entries.segments.push(Entry3 {
batch.segments.push(Entry3 {
aabb,
value: SegmentRef {
wire: wire_idx,
@@ -687,7 +714,7 @@ fn collect_wire_index_entries(wire_idx: u32, wire: &WireModel) -> WireIndexEntri
}
for (index, (point, _)) in wire.snap_pts.iter().enumerate() {
if point.is_finite() {
entries.snap_points.push(Entry3 {
batch.snap_points.push(Entry3 {
aabb: [point.x, point.y, point.z, point.x, point.y, point.z],
value: SnapPointRef {
wire: wire_idx,
@@ -698,7 +725,7 @@ fn collect_wire_index_entries(wire_idx: u32, wire: &WireModel) -> WireIndexEntri
}
for (index, &point) in wire.key_vertices.iter().enumerate() {
if point.iter().all(|value| value.is_finite()) {
entries.key_vertices.push(Entry3 {
batch.key_vertices.push(Entry3 {
aabb: [point[0], point[1], point[2], point[0], point[1], point[2]],
value: KeyVertexRef {
wire: wire_idx,
@@ -713,7 +740,7 @@ fn collect_wire_index_entries(wire_idx: u32, wire: &WireModel) -> WireIndexEntri
else {
continue;
};
entries.key_segments.push(Entry3 {
batch.key_segments.push(Entry3 {
aabb,
value: KeySegmentRef {
wire: wire_idx,
@@ -725,13 +752,13 @@ fn collect_wire_index_entries(wire_idx: u32, wire: &WireModel) -> WireIndexEntri
wire_idx,
&wire.fill_tris,
&wire.fill_tris_low,
&mut entries.fill_triangles,
&mut batch.fill_triangles,
);
append_triangle_entries(
wire_idx,
&wire.pick_tris,
&wire.pick_tris_low,
&mut entries.pick_triangles,
&mut batch.pick_triangles,
);
for start in (0..wire.text_verts.len()).step_by(6) {
let Some(quad) = wire.text_verts.get(start..start + 6) else {
@@ -746,7 +773,7 @@ fn collect_wire_index_entries(wire_idx: u32, wire: &WireModel) -> WireIndexEntri
})) else {
continue;
};
entries.glyphs.push(Entry3 {
batch.glyphs.push(Entry3 {
aabb,
value: GlyphRef {
wire: wire_idx,
@@ -754,20 +781,6 @@ fn collect_wire_index_entries(wire_idx: u32, wire: &WireModel) -> WireIndexEntri
},
});
}
entries
}
fn flatten_entry_parts<T>(mut parts: Vec<Vec<T>>) -> Vec<T> {
let Some((largest, _)) = parts.iter().enumerate().max_by_key(|(_, part)| part.len()) else {
return Vec::new();
};
let mut output = parts.swap_remove(largest);
let remaining: usize = parts.iter().map(Vec::len).sum();
output.reserve(remaining);
for mut part in parts {
output.append(&mut part);
}
output
}
impl InteractionHandleIndex {
@@ -822,127 +835,105 @@ impl InteractionIndex {
let perf = crate::perf::enabled();
#[cfg(not(target_arch = "wasm32"))]
let build_started = iced::time::Instant::now();
let wire_handles: Vec<Option<u64>> = wires
.iter()
.map(|wire| wire.name.parse::<u64>().ok())
.collect();
let n_wires = wires.len();
let mut wire_handles = Vec::with_capacity(n_wires);
let mut wire_ordinals = Vec::with_capacity(n_wires);
let mut next_ordinal: rustc_hash::FxHashMap<u64, u32> =
rustc_hash::FxHashMap::default();
let wire_ordinals: Vec<Option<u32>> = wire_handles
.iter()
.map(|handle| {
let handle = (*handle)?;
let ordinal = next_ordinal.entry(handle).or_default();
let current = *ordinal;
*ordinal += 1;
Some(current)
})
.collect();
rustc_hash::FxHashMap::with_capacity_and_hasher(n_wires.min(4096), Default::default());
for wire in wires {
let handle = wire.name.parse::<u64>().ok();
wire_handles.push(handle);
wire_ordinals.push(handle.map(|h| {
let entry = next_ordinal.entry(h).or_default();
let ord = *entry;
*entry += 1;
ord
}));
}
#[cfg(not(target_arch = "wasm32"))]
let handles_elapsed = build_started.elapsed();
#[cfg(not(target_arch = "wasm32"))]
let collect_started = iced::time::Instant::now();
let mut wire_entries = Vec::with_capacity(wires.len());
let mut unbounded_wires = Vec::new();
let mut screen_unbounded_wires = Vec::new();
let mut max_line_half_width_px = 0.0f32;
let mut max_marker_radius_fraction = 0.0f32;
const CHUNK_SIZE: usize = 256;
#[cfg(not(target_arch = "wasm32"))]
let per_wire: Vec<WireIndexEntries> = {
let batches: Vec<WireIndexBatch> = {
use crate::par::prelude::*;
wires
.par_iter()
.par_chunks(CHUNK_SIZE)
.enumerate()
.map(|(index, wire)| collect_wire_index_entries(index as u32, wire))
.map(|(chunk_idx, chunk)| {
let mut batch = WireIndexBatch::with_capacity_for_chunk(chunk);
let base_idx = (chunk_idx * CHUNK_SIZE) as u32;
for (i, wire) in chunk.iter().enumerate() {
append_wire_index_entries(base_idx + i as u32, wire, &mut batch);
}
batch
})
.collect()
};
#[cfg(target_arch = "wasm32")]
let per_wire: Vec<WireIndexEntries> = wires
.iter()
let batches: Vec<WireIndexBatch> = wires
.chunks(CHUNK_SIZE)
.enumerate()
.map(|(index, wire)| collect_wire_index_entries(index as u32, wire))
.map(|(chunk_idx, chunk)| {
let mut batch = WireIndexBatch::with_capacity_for_chunk(chunk);
let base_idx = (chunk_idx * CHUNK_SIZE) as u32;
for (i, wire) in chunk.iter().enumerate() {
append_wire_index_entries(base_idx + i as u32, wire, &mut batch);
}
batch
})
.collect();
#[cfg(not(target_arch = "wasm32"))]
let collect_elapsed = collect_started.elapsed();
#[cfg(not(target_arch = "wasm32"))]
let flatten_started = iced::time::Instant::now();
let mut segment_parts = Vec::with_capacity(per_wire.len());
let mut snap_point_parts = Vec::with_capacity(per_wire.len());
let mut key_vertex_parts = Vec::with_capacity(per_wire.len());
let mut key_segment_parts = Vec::with_capacity(per_wire.len());
let mut fill_triangle_parts = Vec::with_capacity(per_wire.len());
let mut pick_triangle_parts = Vec::with_capacity(per_wire.len());
let mut glyph_parts = Vec::with_capacity(per_wire.len());
for (wire_idx, entries) in per_wire.into_iter().enumerate() {
let total_wires: usize = batches.iter().map(|b| b.wire_entries.len()).sum();
let total_segments: usize = batches.iter().map(|b| b.segments.len()).sum();
let total_snaps: usize = batches.iter().map(|b| b.snap_points.len()).sum();
let total_key_verts: usize = batches.iter().map(|b| b.key_vertices.len()).sum();
let total_key_segs: usize = batches.iter().map(|b| b.key_segments.len()).sum();
let total_fills: usize = batches.iter().map(|b| b.fill_triangles.len()).sum();
let total_picks: usize = batches.iter().map(|b| b.pick_triangles.len()).sum();
let total_glyphs: usize = batches.iter().map(|b| b.glyphs.len()).sum();
let total_unbounded: usize = batches.iter().map(|b| b.unbounded_wires.len()).sum();
let total_screen_unbounded: usize =
batches.iter().map(|b| b.screen_unbounded_wires.len()).sum();
let mut wire_entries = Vec::with_capacity(total_wires);
let mut segment_entries = Vec::with_capacity(total_segments);
let mut snap_point_entries = Vec::with_capacity(total_snaps);
let mut key_vertex_entries = Vec::with_capacity(total_key_verts);
let mut key_segment_entries = Vec::with_capacity(total_key_segs);
let mut fill_triangle_entries = Vec::with_capacity(total_fills);
let mut pick_triangle_entries = Vec::with_capacity(total_picks);
let mut glyph_entries = Vec::with_capacity(total_glyphs);
let mut unbounded_wires = Vec::with_capacity(total_unbounded);
let mut screen_unbounded_wires = Vec::with_capacity(total_screen_unbounded);
let mut max_line_half_width_px = 0.0f32;
let mut max_marker_radius_fraction = 0.0f32;
for mut batch in batches {
max_line_half_width_px =
max_line_half_width_px.max(entries.max_line_half_width_px);
max_line_half_width_px.max(batch.max_line_half_width_px);
max_marker_radius_fraction =
max_marker_radius_fraction.max(entries.max_marker_radius_fraction);
if let Some(entry) = entries.wire {
wire_entries.push(entry);
}
if entries.unbounded {
unbounded_wires.push(wire_idx as u32);
}
if entries.screen_unbounded {
screen_unbounded_wires.push(wire_idx as u32);
}
segment_parts.push(entries.segments);
snap_point_parts.push(entries.snap_points);
key_vertex_parts.push(entries.key_vertices);
key_segment_parts.push(entries.key_segments);
fill_triangle_parts.push(entries.fill_triangles);
pick_triangle_parts.push(entries.pick_triangles);
glyph_parts.push(entries.glyphs);
max_marker_radius_fraction.max(batch.max_marker_radius_fraction);
wire_entries.append(&mut batch.wire_entries);
segment_entries.append(&mut batch.segments);
snap_point_entries.append(&mut batch.snap_points);
key_vertex_entries.append(&mut batch.key_vertices);
key_segment_entries.append(&mut batch.key_segments);
fill_triangle_entries.append(&mut batch.fill_triangles);
pick_triangle_entries.append(&mut batch.pick_triangles);
glyph_entries.append(&mut batch.glyphs);
unbounded_wires.append(&mut batch.unbounded_wires);
screen_unbounded_wires.append(&mut batch.screen_unbounded_wires);
}
#[cfg(not(target_arch = "wasm32"))]
let (
((segment_entries, snap_point_entries), (key_vertex_entries, key_segment_entries)),
((fill_triangle_entries, pick_triangle_entries), glyph_entries),
) = crate::par::join(
|| {
crate::par::join(
|| {
crate::par::join(
|| flatten_entry_parts(segment_parts),
|| flatten_entry_parts(snap_point_parts),
)
},
|| {
crate::par::join(
|| flatten_entry_parts(key_vertex_parts),
|| flatten_entry_parts(key_segment_parts),
)
},
)
},
|| {
let (fill, pick) = crate::par::join(
|| flatten_entry_parts(fill_triangle_parts),
|| flatten_entry_parts(pick_triangle_parts),
);
((fill, pick), flatten_entry_parts(glyph_parts))
},
);
#[cfg(target_arch = "wasm32")]
let (
segment_entries,
snap_point_entries,
key_vertex_entries,
key_segment_entries,
fill_triangle_entries,
pick_triangle_entries,
glyph_entries,
) = (
flatten_entry_parts(segment_parts),
flatten_entry_parts(snap_point_parts),
flatten_entry_parts(key_vertex_parts),
flatten_entry_parts(key_segment_parts),
flatten_entry_parts(fill_triangle_parts),
flatten_entry_parts(pick_triangle_parts),
flatten_entry_parts(glyph_parts),
);
#[cfg(not(target_arch = "wasm32"))]
let flatten_elapsed = flatten_started.elapsed();
#[cfg(not(target_arch = "wasm32"))]