5d91b678bb
Also avoid ReadBytes calls that allocate a buffer by either updating the stream position (if not interested in the bytes), by reusing an input buffer (if interested in the bytes), or using a stackalloc buffer to avoid the allocation (for small reads).
64 lines
1.8 KiB
C#
64 lines
1.8 KiB
C#
#region Copyright & License Information
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/*
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* Copyright (c) The OpenRA Developers and Contributors
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* This file is part of OpenRA, which is free software. It is made
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* available to you under the terms of the GNU General Public License
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* as published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version. For more
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* information, see COPYING.
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*/
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#endregion
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using System;
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using System.IO;
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namespace OpenRA.Mods.Cnc.FileFormats
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{
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public class HvaReader
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{
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public readonly uint FrameCount;
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public readonly uint LimbCount;
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public readonly float[] Transforms;
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public HvaReader(Stream s, string fileName)
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{
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// Index swaps for transposing a matrix
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var ids = new byte[] { 0, 4, 8, 12, 1, 5, 9, 13, 2, 6, 10, 14 };
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s.Seek(16, SeekOrigin.Begin);
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FrameCount = s.ReadUInt32();
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LimbCount = s.ReadUInt32();
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// Skip limb names
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s.Seek(16 * LimbCount, SeekOrigin.Current);
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Transforms = new float[16 * FrameCount * LimbCount];
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var testMatrix = new float[16];
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for (var j = 0; j < FrameCount; j++)
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for (var i = 0; i < LimbCount; i++)
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{
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// Convert to column-major matrices and add the final matrix row
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var c = 16 * (LimbCount * j + i);
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Transforms[c + 3] = 0;
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Transforms[c + 7] = 0;
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Transforms[c + 11] = 0;
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Transforms[c + 15] = 1;
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for (var k = 0; k < 12; k++)
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Transforms[c + ids[k]] = s.ReadSingle();
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Array.Copy(Transforms, 16 * (LimbCount * j + i), testMatrix, 0, 16);
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if (Util.MatrixInverse(testMatrix) == null)
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throw new InvalidDataException(
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$"The transformation matrix for HVA file `{fileName}` section {i} frame {j} is invalid because it is not invertible!");
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}
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}
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public static HvaReader Load(string filename)
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{
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using (var s = File.OpenRead(filename))
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return new HvaReader(s, Path.GetFileName(filename));
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}
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}
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}
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