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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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tests/MrGameEng.Graphics.Tests/CullingTests.cs
+27
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@@ -37,6 +37,33 @@ public class CullingTests
Assert.Equal(0.5f * MathF.Sqrt(800f), radius, 3);
}
[Fact]
public void BoundingCircle_RegionOverload_MatchesSizeOverload_ForUniformScale()
{
var region = new Texture2DRegion(null!, new Rectangle(0, 0, 48, 24));
var transform = new Transform2D(new Vector2(10f, 20f), rotation: 0.6f, scale: new Vector2(1.5f, 1.5f));
var origin = new Vector2(5f, 7f);
var (centerA, radiusA) = CullingMath.SpriteBoundingCircle(transform, 48f, 24f, origin);
var (centerB, radiusB) = CullingMath.SpriteBoundingCircle(in transform, region, origin);
Assert.Equal(centerA.X, centerB.X, 3);
Assert.Equal(centerA.Y, centerB.Y, 3);
Assert.Equal(radiusA, radiusB, 3);
}
[Fact]
public void BoundingCircle_RegionOverload_IsConservative_ForNonUniformScale()
{
var region = new Texture2DRegion(null!, new Rectangle(0, 0, 100, 10));
var transform = new Transform2D(Vector2.Zero, scale: new Vector2(1f, 3f));
var (_, exact) = CullingMath.SpriteBoundingCircle(transform, 100f, 10f, Vector2.Zero);
var (_, conservative) = CullingMath.SpriteBoundingCircle(in transform, region, Vector2.Zero);
Assert.True(conservative >= exact);
}
[Theory]
[InlineData(50f, 50f, true)] // inside
[InlineData(-4f, 50f, true)] // touching from the left (radius 5)