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/SheetLoadScreen.cs

@@ -0,0 +1,101 @@
+#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.Collections.Generic;
+using System.Diagnostics;
+using OpenRA.FileSystem;
+using OpenRA.Graphics;
+using OpenRA.Primitives;
+
+namespace OpenRA.Mods.Common.LoadScreens
+{
+	public abstract class SheetLoadScreen : BlankLoadScreen
+	{
+		Stopwatch lastUpdate;
+
+		protected Dictionary<string, string> Info { get; private set; }
+		float dpiScale = 1;
+
+		Sheet sheet;
+		int density;
+
+		public override void Init(Manifest manifest, IReadOnlyFileSystem fileSystem)
+		{
+			base.Init(manifest, fileSystem);
+			Info = manifest.LoadScreen.ToDictionary(my => my.Value);
+		}
+
+		public abstract void DisplayInner(Renderer r, Sheet s, int density);
+
+		public override void Display()
+		{
+			// Limit load screens to at most 5 FPS
+			if (Game.Renderer == null || (lastUpdate != null && lastUpdate.Elapsed.TotalSeconds < 0.2))
+				return;
+
+			// Start the timer on the first render
+			lastUpdate ??= Stopwatch.StartNew();
+
+			// Check for window DPI changes
+			// We can't trust notifications to be working during initialization, so must do this manually
+			var scale = Game.Renderer.WindowScale;
+			if (dpiScale != scale)
+			{
+				dpiScale = scale;
+
+				// Force images to be reloaded on the next display
+				sheet?.Dispose();
+
+				sheet = null;
+			}
+
+			if (sheet == null && Info.TryGetValue("Image", out var image))
+			{
+				density = 1;
+				if (dpiScale > 2 && Info.TryGetValue("Image3x", out var image3))
+				{
+					image = image3;
+					density = 3;
+				}
+				else if (dpiScale > 1 && Info.TryGetValue("Image2x", out var image2))
+				{
+					image = image2;
+					density = 2;
+				}
+
+				using (var stream = fileSystem.Open(Platform.ResolvePath(image)))
+				{
+					sheet = new Sheet(SheetType.BGRA, stream);
+					sheet.GetTexture().ScaleFilter = TextureScaleFilter.Linear;
+				}
+			}
+
+			Game.Renderer.BeginUI();
+			DisplayInner(Game.Renderer, sheet, density);
+			Game.Renderer.EndFrame(new NullInputHandler());
+
+			lastUpdate.Restart();
+		}
+
+		protected static Sprite CreateSprite(Sheet s, int density, Rectangle rect)
+		{
+			return new Sprite(s, density * rect, TextureChannel.RGBA, 1f / density);
+		}
+
+		protected override void Dispose(bool disposing)
+		{
+			if (disposing)
+				sheet?.Dispose();
+
+			base.Dispose(disposing);
+		}
+	}
+}