Implement hva parser.

OpenRA.FileFormats/Graphics/HvaReader.cs

@@ -0,0 +1,70 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2013 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+
+#endregion
+
+using System;
+using System.IO;
+using System.Linq;
+
+namespace OpenRA.FileFormats
+{
+	public class HvaReader
+	{
+		public readonly uint FrameCount;
+		public readonly uint LimbCount;
+		float[] Transforms;
+
+		public HvaReader(Stream s)
+		{
+			// Index swaps for transposing a matrix
+			var ids = new byte[]{0,4,8,12,1,5,9,13,2,6,10,14};
+
+			s.Seek(16, SeekOrigin.Begin);
+			FrameCount = s.ReadUInt32();
+			LimbCount = s.ReadUInt32();
+
+			// Skip limb names
+			s.Seek(16*LimbCount, SeekOrigin.Current);
+			Transforms = new float[16*FrameCount*LimbCount];
+			for (var j = 0; j < FrameCount; j++)
+				for (var i = 0; i < LimbCount; i++)
+			{
+				// Convert to column-major matrices and add the final matrix row
+				var c = 16*(LimbCount*j + i);
+				Transforms[c + 3] = 0;
+				Transforms[c + 7] = 0;
+				Transforms[c + 11] = 0;
+				Transforms[c + 15] = 1;
+
+				for (var k = 0; k < 12; k++)
+					Transforms[c + ids[k]] = s.ReadFloat();
+			}
+		}
+
+		public float[] TransformationMatrix(uint limb, uint frame)
+		{
+			if (frame >= FrameCount)
+				throw new ArgumentOutOfRangeException("frame", "Only {0} frames exist.".F(FrameCount));
+			if (limb >= LimbCount)
+				throw new ArgumentOutOfRangeException("limb", "Only {1} limbs exist.".F(LimbCount));
+
+			var t = new float[16];
+			Array.Copy(Transforms, 16*(LimbCount*frame + limb), t, 0, 16);
+
+			return t;
+		}
+
+		public static HvaReader Load(string filename)
+		{
+			using (var s = File.OpenRead(filename))
+				return new HvaReader(s);
+		}
+	}
+}

OpenRA.FileFormats/OpenRA.FileFormats.csproj

@@ -142,6 +142,7 @@
     <Compile Include="FileFormats\XccLocalDatabase.cs" />
     <Compile Include="FileFormats\XccGlobalDatabase.cs" />
     <Compile Include="Graphics\VxlReader.cs" />
+    <Compile Include="Graphics\HvaReader.cs" />
     <Compile Include="StreamExts.cs" />
   </ItemGroup>
   <ItemGroup>