Initial commit: OpenRA game engine

Fork from OpenRA/OpenRA with one-click launch script (start-ra.cmd)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

OpenRA.Platforms.Default/StaticIndexBuffer.cs

@@ -0,0 +1,62 @@
+#region Copyright & License Information
+/*
+ * Copyright (c) The OpenRA Developers and Contributors
+ * 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, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System;
+using System.Runtime.InteropServices;
+
+namespace OpenRA.Platforms.Default
+{
+	sealed class StaticIndexBuffer : ThreadAffine, IDisposable, IIndexBuffer
+	{
+		const int UintSize = 4;
+		uint buffer;
+		bool disposed;
+
+		public StaticIndexBuffer(uint[] indices)
+		{
+			OpenGL.glGenBuffers(1, out buffer);
+			OpenGL.CheckGLError();
+			Bind();
+
+			var ptr = GCHandle.Alloc(indices, GCHandleType.Pinned);
+			try
+			{
+				OpenGL.glBufferData(OpenGL.GL_ELEMENT_ARRAY_BUFFER,
+					new IntPtr(UintSize * indices.Length),
+					ptr.AddrOfPinnedObject(),
+					OpenGL.GL_STATIC_DRAW);
+			}
+			finally
+			{
+				ptr.Free();
+			}
+
+			OpenGL.CheckGLError();
+		}
+
+		public void Bind()
+		{
+			VerifyThreadAffinity();
+			OpenGL.glBindBuffer(OpenGL.GL_ELEMENT_ARRAY_BUFFER, buffer);
+			OpenGL.CheckGLError();
+		}
+
+		public void Dispose()
+		{
+			if (disposed)
+				return;
+
+			disposed = true;
+			OpenGL.glDeleteBuffers(1, ref buffer);
+			OpenGL.CheckGLError();
+		}
+	}
+}