1 files changed, 64 insertions, 0 deletions
diff --git a/Tests/OpenGL/Extensions.cs b/Tests/OpenGL/Extensions.cs
new file mode 100644
index 00000000..17fe6086
--- /dev/null
+++ b/Tests/OpenGL/Extensions.cs
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+//
+//  Extensions.cs
+//
+//  Author:
+//       Jean-Philippe Bruyère <jp.bruyere@hotmail.com>
+//
+//  Copyright (c) 2017 jp
+//
+//  This program is free software: you can redistribute it and/or modify
+//  it 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.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+using System;
+using OpenTK;
+using Crow;
+
+namespace Crow
+{
+	public static class Extensions {
+		public static Vector4 ToVector4(this Color c){
+			float[] f = c.floatArray;
+			return new Vector4 (f [0], f [1], f [2], f [3]);
+		}
+		public static Vector3 Transform(this Vector3 v, Matrix4 m){
+			return Vector4.Transform(new Vector4(v, 1), m).Xyz;
+		}
+		public static bool IsInBetween(this int v, int min, int max){
+			return v >= min & v <= max;
+		}
+		public static Vector4 UnProject(ref Matrix4 projection, ref Matrix4 view, int[] viewport, Vector2 mouse)
+		{
+			Vector4 vec;
+
+			vec.X = 2.0f * mouse.X / (float)viewport[2] - 1;
+			vec.Y = -(2.0f * mouse.Y / (float)viewport[3] - 1);
+			vec.Z = 0f;
+			vec.W = 1.0f;
+
+			Matrix4 viewInv = Matrix4.Invert(view);
+			Matrix4 projInv = Matrix4.Invert(projection);
+
+			Vector4.Transform(ref vec, ref projInv, out vec);
+			Vector4.Transform(ref vec, ref viewInv, out vec);
+
+			if (vec.W > float.Epsilon || vec.W < float.Epsilon)
+			{
+				vec.X /= vec.W;
+				vec.Y /= vec.W;
+				vec.Z /= vec.W;
+			}
+
+			return vec;
+		}
+	}
+}
+