Optimize GC for group frame.

Assets/Cryville/Common/Math/SquareMatrix.cs

@@ -1,9 +1,13 @@
-namespace Cryville.Common.Math {
+using System;
+
+namespace Cryville.Common.Math {
 	/// <summary>
 	/// Represents a square matrix.
 	/// </summary>
 	public class SquareMatrix {
 		readonly float[,] content;
+		readonly float[,] buffer;
+		readonly int[] refl;
 		/// <summary>
 		/// The size of the matrix.
 		/// </summary>
@@ -17,6 +21,8 @@
 		/// <param name="size">The size of the matrix.</param>
 		public SquareMatrix(int size) {
 			content = new float[size, size];
+			buffer = new float[size, size];
+			refl = new int[size];
 			Size = size;
 		}
 		/// <summary>
@@ -38,38 +44,36 @@
 		/// <returns>The column vector eliminated.</returns>
 		public ColumnVector<T> Eliminate<T>(ColumnVector<T> v, IVectorOperator<T> o) {
 			int s = Size;
-			float[,] d = (float[,])content.Clone();
+			Array.Copy(content, buffer, Size * Size);
-			int[] refl = new int[s];
+			for (int i = 0; i < s; i++) refl[i] = i;
-			for (int i = 0; i < s; i++)
-				refl[i] = i;
 			for (int r = 0; r < s; r++) {
 				for (int r0 = r; r0 < s; r0++)
-					if (d[refl[r0], r] != 0) {
+					if (buffer[refl[r0], r] != 0) {
 						refl[r] = r0;
 						refl[r0] = r;
 						break;
 					}
 				int or = refl[r];
-				float sf0 = d[or, r];
+				float sf0 = buffer[or, r];
 				for (int c0 = r; c0 < s; c0++)
-					d[or, c0] /= sf0;
+					buffer[or, c0] /= sf0;
 				v[or] = o.ScalarMultiply(1 / sf0, v[or]);
 				for (int r1 = r + 1; r1 < s; r1++) {
 					int or1 = refl[r1];
-					float sf1 = d[or1, r];
+					float sf1 = buffer[or1, r];
 					for (int c1 = r; c1 < s; c1++)
-						d[or1, c1] -= d[or, c1] * sf1;
+						buffer[or1, c1] -= buffer[or, c1] * sf1;
 					v[or1] = o.Add(v[or1], o.ScalarMultiply(-sf1, v[or]));
 				}
 			}
-			T[] res = new T[s];
+			ColumnVector<T> res = new ColumnVector<T>(s);
 			for (int r2 = s - 1; r2 >= 0; r2--) {
 				var v2 = v[refl[r2]];
 				for (int c2 = r2 + 1; c2 < s; c2++)
-					v2 = o.Add(v2, o.ScalarMultiply(-d[refl[r2], c2], res[refl[c2]]));
+					v2 = o.Add(v2, o.ScalarMultiply(-buffer[refl[r2], c2], res[refl[c2]]));
 				res[refl[r2]] = v2;
 			}
-			return new ColumnVector<T>(res);
+			return res;
 		}
 		/// <summary>
 		/// Creates a square matrix and fills it with polynomial coefficients.

Assets/Cryville/Crtr/GroupHandler.cs

@@ -1,7 +1,6 @@
 using Cryville.Common.Math;
 using Cryville.Crtr.Event;
 using System;
-using System.Collections.Generic;
 using System.Linq;
 using UnityEngine;
 
@@ -10,7 +9,7 @@ namespace Cryville.Crtr {
 		public ChartHandler ch;
 
 		SquareMatrix matFrame;
-		List<ContainerState> tracks;
+		ContainerState[] tracks;
 
 		public GroupHandler(Chart.Group tg, ChartHandler ch) : base() {
 			this.ch = ch;
@@ -28,20 +27,22 @@ namespace Cryville.Crtr {
 				from c in cs.Children
 				where c.Value.Container is Chart.Track
 				select c.Value
-			).ToList();
+			).ToArray();
-			matFrame = SquareMatrix.WithPolynomialCoefficients(tracks.Count);
+			matFrame = SquareMatrix.WithPolynomialCoefficients(tracks.Length);
+			frame = new ColumnVector<Vector3>(tracks.Length);
 		}
 
+		ColumnVector<Vector3> frame;
 		public ColumnVector<Vector3> GetCurrentFrame(Func<ContainerState, Vector3> func) {
-			var vl = from t in tracks select func(t);
+			for (int i = 0; i < tracks.Length; i++)
-			return matFrame.Eliminate(
+				frame[i] = func(tracks[i]);
-				new ColumnVector<Vector3>(vl.ToArray()),
+			return matFrame.Eliminate(frame, Vector3Operator.Instance);
-				new Vector3Operator()
-			);
 		}
 	}
 
 	class Vector3Operator : IVectorOperator<Vector3> {
+		public static Vector3Operator Instance = new Vector3Operator();
+
 		public Vector3 Add(Vector3 lhs, Vector3 rhs) {
 			return lhs + rhs;
 		}

Assets/Cryville/Crtr/NoteHandler.cs

@@ -117,6 +117,7 @@ namespace Cryville.Crtr {
 			return Quaternion.LookRotation(r, state.Normal);
 		}
 
+		List<Vector3> ctrl = new List<Vector3>(2);
 		Vector3 GetFrame(ContainerState state, float track, Func<ContainerState, Vector3> func) {
 			// TODO
 			int id = Mathf.FloorToInt(track);
@@ -134,7 +135,7 @@ namespace Cryville.Crtr {
 			if (c0 && c1)
 				return (1 - t) * p1 + t * p2;
 			else {
-				var ctrl = new List<Vector3>(2);
+				ctrl.Clear();
 				if (!c0) {
 					var tp = ts0.GetControlPoint(true, deltaz);
 					if (tp != Vector3.zero) ctrl.Add(tp);
@@ -149,7 +150,7 @@ namespace Cryville.Crtr {
 						ColumnVector<float>.WithPolynomialCoefficients(
 							frame.Size, track
 						),
-						new Vector3Operator()
+						Vector3Operator.Instance
 					);
 				}
 				else if (ctrl.Count == 1) {