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perf(hash): swap std HashMap/HashSet for rustc-hash FxHash

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Phase 4.1. Handle / u64 keys dominate the hot maps (block_defn,
hatch / image / mesh caches, draw-depth map, viewport wire caches);
the default SipHash is wasted work on integer keys. Alias the std
types to rustc_hash::FxHashMap / FxHashSet crate-wide so every map and
set — including the cross-module draw-depth map shared between scene
and the GPU pipelines — uses the faster hasher consistently.

Mechanical: no behavioural change. Constructors moved from ::new() to
::default() (Fx variants carry no RandomState). Build + 13 tests green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Hakan Seven 2026-06-05 00:35:53 +03:00
commit 70702d063f
30 changed files with 102 additions and 98 deletions
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6
src/entities/dimension.rs
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@ -808,7 +808,7 @@ pub trait DimensionTess {
line_weight_px: f32,
world_offset: [f64; 3],
anno_scale: f32,
selected_set: &std::collections::HashSet<acadrust::Handle>,
selected_set: &rustc_hash::FxHashSet<acadrust::Handle>,
active_viewport: Option<acadrust::Handle>,
bg_color: [f32; 4],
view_aabb: Option<[f32; 4]>,
@ -826,7 +826,7 @@ impl DimensionTess for Dimension {
line_weight_px: f32,
world_offset: [f64; 3],
anno_scale: f32,
selected_set: &std::collections::HashSet<acadrust::Handle>,
selected_set: &rustc_hash::FxHashSet<acadrust::Handle>,
active_viewport: Option<acadrust::Handle>,
bg_color: [f32; 4],
view_aabb: Option<[f32; 4]>,
@ -862,7 +862,7 @@ fn tessellate_dimension_inner(
// LOD hints — when present, synthesised dim text routes through the
// top-level LOD ladder (baseline / greek / full) instead of the truck
// path so far-out drawings collapse to a colored rect or baseline.
selected_set: &std::collections::HashSet<acadrust::Handle>,
selected_set: &rustc_hash::FxHashSet<acadrust::Handle>,
active_viewport: Option<acadrust::Handle>,
bg_color: [f32; 4],
view_aabb: Option<[f32; 4]>,