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Stable radix sprite sort and render hot-path optimizations

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SpriteBatcher now sorts with a stable LSD radix sort: equal-key sprites
keep submission order across frames (no flicker) and passes over digits
identical in all keys are skipped, making the common single-layer case
nearly free. Hot paths avoid per-sprite trig and square roots: SinCos is
skipped for unrotated sprites and the culling radius comes from the
region's precomputed diagonal.

Stress scene (100k entities, ~61k on screen, Release): 103 -> 124 FPS.
Sample now runs with VSync off to show real frame rates.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Leonid Pershin
2026-06-11 04:39:17 +03:00
co-authored by Claude Fable 5
parent 2b7d4c4fef
commit a3e6d3bb0a
9 changed files with 214 additions and 18 deletions
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docs/roadmap.md
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@@ -20,5 +20,5 @@
- Particles
- UI
- Бенчмарки BenchmarkDotNet для систем (сейчас производительность контролируется стресс-сценой)
- Стабильная сортировка спрайтов с равным ключом (сейчас порядок не гарантирован между кадрами)
- Spatial hash для culling на очень больших мирах (если профилирование покажет необходимость)
- Параллельная запись вершин (Parallel.For по чанкам), если упрёмся в CPU на ещё больших сценах