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.Game/Graphics/Sprite.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 System;
+using OpenRA.Primitives;
+
+namespace OpenRA.Graphics
+{
+	public class Sprite
+	{
+		public readonly Rectangle Bounds;
+		public readonly Sheet Sheet;
+		public readonly BlendMode BlendMode;
+		public readonly TextureChannel Channel;
+		public readonly float ZRamp;
+		public readonly float3 Size;
+		public readonly float3 Offset;
+		public readonly float Top, Left, Bottom, Right;
+
+		public Sprite(Sheet sheet, Rectangle bounds, TextureChannel channel, float scale = 1)
+			: this(sheet, bounds, 0, float2.Zero, channel, BlendMode.Alpha, scale) { }
+
+		public Sprite(Sheet sheet, Rectangle bounds, float zRamp, in float3 offset, TextureChannel channel, BlendMode blendMode = BlendMode.Alpha, float scale = 1f)
+		{
+			Sheet = sheet;
+			Bounds = bounds;
+			Offset = offset;
+			ZRamp = zRamp;
+			Channel = channel;
+			Size = scale * new float3(bounds.Size.Width, bounds.Size.Height, bounds.Size.Height * zRamp);
+			BlendMode = blendMode;
+
+			// Some GPUs suffer from precision issues when rendering into non 1:1 framebuffers that result
+			// in rendering a line of texels that sample outside the sprite rectangle.
+			// Insetting the texture coordinates by a small fraction of a pixel avoids this
+			// with negligible impact on the 1:1 rendering case.
+			const float Inset = 1 / 128f;
+			Left = (Math.Min(bounds.Left, bounds.Right) + Inset) / sheet.Size.Width;
+			Top = (Math.Min(bounds.Top, bounds.Bottom) + Inset) / sheet.Size.Height;
+			Right = (Math.Max(bounds.Left, bounds.Right) - Inset) / sheet.Size.Width;
+			Bottom = (Math.Max(bounds.Top, bounds.Bottom) - Inset) / sheet.Size.Height;
+		}
+	}
+
+	public class SpriteWithSecondaryData : Sprite
+	{
+		public readonly Sheet SecondarySheet;
+		public readonly Rectangle SecondaryBounds;
+		public readonly TextureChannel SecondaryChannel;
+		public readonly float SecondaryTop, SecondaryLeft, SecondaryBottom, SecondaryRight;
+
+		public SpriteWithSecondaryData(Sprite s, Sheet secondarySheet, Rectangle secondaryBounds, TextureChannel secondaryChannel)
+			: base(s.Sheet, s.Bounds, s.ZRamp, s.Offset, s.Channel, s.BlendMode)
+		{
+			SecondarySheet = secondarySheet;
+			SecondaryBounds = secondaryBounds;
+			SecondaryChannel = secondaryChannel;
+			SecondaryLeft = (float)Math.Min(secondaryBounds.Left, secondaryBounds.Right) / s.Sheet.Size.Width;
+			SecondaryTop = (float)Math.Min(secondaryBounds.Top, secondaryBounds.Bottom) / s.Sheet.Size.Height;
+			SecondaryRight = (float)Math.Max(secondaryBounds.Left, secondaryBounds.Right) / s.Sheet.Size.Width;
+			SecondaryBottom = (float)Math.Max(secondaryBounds.Top, secondaryBounds.Bottom) / s.Sheet.Size.Height;
+		}
+	}
+
+	public enum TextureChannel : byte
+	{
+		Red = 0,
+		Green = 1,
+		Blue = 2,
+		Alpha = 3,
+		RGBA = 4
+	}
+}