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.Mods.Common/LoadScreens/ModContentLoadScreen.cs

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+#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 OpenRA.Graphics;
+using OpenRA.Mods.Common.Widgets;
+using OpenRA.Primitives;
+using OpenRA.Widgets;
+
+namespace OpenRA.Mods.Common.LoadScreens
+{
+	public sealed class ModContentLoadScreen : SheetLoadScreen
+	{
+		Sprite sprite;
+		Rectangle bounds;
+
+		Sheet lastSheet;
+		int lastDensity;
+		Size lastResolution;
+
+		public override void DisplayInner(Renderer r, Sheet s, int density)
+		{
+			if (s != lastSheet || density != lastDensity)
+			{
+				lastSheet = s;
+				lastDensity = density;
+				sprite = CreateSprite(s, density, new Rectangle(0, 0, 1024, 480));
+			}
+
+			if (r.Resolution != lastResolution)
+			{
+				lastResolution = r.Resolution;
+				bounds = new Rectangle(0, 0, lastResolution.Width, lastResolution.Height);
+			}
+
+			WidgetUtils.FillRectWithSprite(bounds, sprite);
+		}
+
+		public override void StartGame(Arguments args)
+		{
+			Ui.LoadWidget("MODCONTENT_BACKGROUND", Ui.Root, []);
+		}
+
+		public override bool BeforeLoad(ModData modData)
+		{
+			return true;
+		}
+	}
+}