Merged Visual mode and GZDoom Visual mode into GZDB Visual mode. GZDoomEditing.dll is no longer required.

Source/Plugins/BuilderModes/VisualModes/TexturePlane.cs

@@ -0,0 +1,56 @@
+#region === Copyright (c) 2010 Pascal van der Heiden ===
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Text;
+using CodeImp.DoomBuilder.Geometry;
+using CodeImp.DoomBuilder.Map;
+using CodeImp.DoomBuilder.Rendering;
+
+#endregion
+
+namespace CodeImp.DoomBuilder.BuilderModes
+{
+	internal struct TexturePlane
+	{
+		// Geometry coordinates (left-top, right-top and right-bottom)
+		public Vector3D vlt;
+		public Vector3D vrt;
+		public Vector3D vrb;
+
+		// Texture coordinates on the points above
+		public Vector2D tlt;
+		public Vector2D trt;
+		public Vector2D trb;
+		
+		// This returns interpolated texture coordinates for the point p on the plane defined by vlt, vrt and vrb
+		public Vector2D GetTextureCoordsAt(Vector3D p)
+		{
+			// Delta vectors
+			Vector3D v31 = vrb - vlt;
+			Vector3D v21 = vrt - vlt;
+			Vector3D vp1 = p - vlt;
+			
+			// Compute dot products
+			float d00 = Vector3D.DotProduct(v31, v31);
+			float d01 = Vector3D.DotProduct(v31, v21);
+			float d02 = Vector3D.DotProduct(v31, vp1);
+			float d11 = Vector3D.DotProduct(v21, v21);
+			float d12 = Vector3D.DotProduct(v21, vp1);
+
+			// Compute barycentric coordinates
+			float invd = 1.0f / (d00 * d11 - d01 * d01);
+			float u = (d11 * d02 - d01 * d12) * invd;
+			float v = (d00 * d12 - d01 * d02) * invd;
+
+			// Delta texture coordinates
+			Vector2D t21 = trt - tlt;
+			Vector2D t31 = trb - tlt;
+
+			// Lerp
+			return tlt + t31 * u + t21 * v;
+		}
+	}
+}