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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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14
src/entities/table.rs
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@ -59,8 +59,8 @@ impl TruckConvertible for Table {
// hidden borders disappear from the grid. Cells with no style still
// emit the standard four borders. To avoid drawing each shared edge
// twice we coalesce the segments by their (start, end) coordinates.
use std::collections::HashSet;
let mut emitted: HashSet<(i32, i32, i32, i32)> = HashSet::new();
use rustc_hash::FxHashSet as HashSet;
let mut emitted: HashSet<(i32, i32, i32, i32)> = HashSet::default();
let try_add = |a: Vec3, b: Vec3, vis: bool, emitted: &mut HashSet<(i32, i32, i32, i32)>, pts: &mut Vec<[f32; 3]>| {
if !vis {
return;
@ -334,7 +334,7 @@ pub fn tessellate_table(
use crate::scene::tess_util::aci_to_rgba;
use crate::scene::wire_model::WireModel;
use acadrust::types::Color;
use std::collections::HashMap;
use rustc_hash::FxHashMap as HashMap;
if tab.rows.is_empty() || tab.columns.is_empty() {
return Vec::new();
@ -438,10 +438,10 @@ pub fn tessellate_table(
};
// Accumulators keyed by quantised colour (+ weight for borders).
let mut fills: HashMap<[u8; 4], ([f32; 4], Vec<[f32; 3]>)> = HashMap::new();
let mut texts: HashMap<[u8; 4], ([f32; 4], Vec<[f32; 3]>)> = HashMap::new();
let mut borders: HashMap<([u8; 4], u32), ([f32; 4], f32, Vec<[f32; 3]>)> = HashMap::new();
let mut emitted: std::collections::HashSet<(i32, i32, i32, i32)> = std::collections::HashSet::new();
let mut fills: HashMap<[u8; 4], ([f32; 4], Vec<[f32; 3]>)> = HashMap::default();
let mut texts: HashMap<[u8; 4], ([f32; 4], Vec<[f32; 3]>)> = HashMap::default();
let mut borders: HashMap<([u8; 4], u32), ([f32; 4], f32, Vec<[f32; 3]>)> = HashMap::default();
let mut emitted: rustc_hash::FxHashSet<(i32, i32, i32, i32)> = rustc_hash::FxHashSet::default();
let sel_col = WireModel::SELECTED;
let mut add_edge =