Utility.cs

// MonoGame - Copyright (C) MonoGame Foundation, Inc
// This file is subject to the terms and conditions defined in
// file 'LICENSE.txt', which is part of this source code package.

using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;
using Microsoft.Xna.Framework;
using NUnit.Framework;

namespace MonoGame.Tests {

    public class MatrixComparer : IEqualityComparer<Matrix>
    {
        static public MatrixComparer Epsilon = new MatrixComparer(0.000001f);

        private readonly float _epsilon;

        private MatrixComparer(float epsilon)
        {
            _epsilon = epsilon;
        }

        public bool Equals(Matrix x, Matrix y)
        {
            return  Math.Abs(x.M11 - y.M11) < _epsilon &&
                    Math.Abs(x.M12 - y.M12) < _epsilon &&
                    Math.Abs(x.M13 - y.M13) < _epsilon &&
                    Math.Abs(x.M14 - y.M14) < _epsilon &&
                    Math.Abs(x.M21 - y.M21) < _epsilon &&
                    Math.Abs(x.M22 - y.M22) < _epsilon &&
                    Math.Abs(x.M23 - y.M23) < _epsilon &&
                    Math.Abs(x.M24 - y.M24) < _epsilon &&
                    Math.Abs(x.M31 - y.M31) < _epsilon &&
                    Math.Abs(x.M32 - y.M32) < _epsilon &&
                    Math.Abs(x.M33 - y.M33) < _epsilon &&
                    Math.Abs(x.M34 - y.M34) < _epsilon &&
                    Math.Abs(x.M41 - y.M41) < _epsilon &&
                    Math.Abs(x.M42 - y.M42) < _epsilon &&
                    Math.Abs(x.M43 - y.M43) < _epsilon &&
                    Math.Abs(x.M44 - y.M44) < _epsilon;
        }

        public int GetHashCode(Matrix obj)
        {
            throw new NotImplementedException();
        }
    }

    public class ByteComparer : IEqualityComparer<byte>
    {
        static public ByteComparer Equal = new ByteComparer();

        private ByteComparer()
        {
        }

        public bool Equals(byte x, byte y)
        {
            return x == y;
        }

        public int GetHashCode(byte obj)
        {
            throw new NotImplementedException();
        }
    }

    public class ColorComparer : IEqualityComparer<Color>
    {
        static public ColorComparer Equal = new ColorComparer();

        private ColorComparer()
        {
        }

        public bool Equals(Color x, Color y)
        {
            return x == y;
        }

        public int GetHashCode(Color obj)
        {
            throw new NotImplementedException();
        }
    }

    public class FloatComparer : IEqualityComparer<float>
    {
        static public FloatComparer Epsilon = new FloatComparer(0.000001f);

        private readonly float _epsilon;

        private FloatComparer(float epsilon)
        {
            _epsilon = epsilon;
        }

        public bool Equals(float x, float y)
        {
            return Math.Abs(x - y) < _epsilon;
        }

        public int GetHashCode(float obj)
        {
            throw new NotImplementedException();
        }
    }

    public class BoundingSphereComparer : IEqualityComparer<BoundingSphere>
    {
        static public BoundingSphereComparer Epsilon = new BoundingSphereComparer(0.000001f);

        private readonly float _epsilon;

        private BoundingSphereComparer(float epsilon)
        {
            _epsilon = epsilon;
        }

        public bool Equals(BoundingSphere x, BoundingSphere y)
        {
            return  Math.Abs(x.Center.X - y.Center.X) < _epsilon &&
                    Math.Abs(x.Center.Y - y.Center.Y) < _epsilon &&
                    Math.Abs(x.Center.Z - y.Center.Z) < _epsilon &&
                    Math.Abs(x.Radius - y.Radius) < _epsilon;
        }

        public int GetHashCode(BoundingSphere obj)
        {
            throw new NotImplementedException();
        }
    }

    public class Vector2Comparer : IEqualityComparer<Vector2>
    {
        static public Vector2Comparer Epsilon = new Vector2Comparer(0.000001f);

        private readonly float _epsilon;

        private Vector2Comparer(float epsilon)
        {
            _epsilon = epsilon;
        }

        public bool Equals(Vector2 x, Vector2 y)
        {
            return Math.Abs(x.X - y.X) < _epsilon &&
                   Math.Abs(x.Y - y.Y) < _epsilon;
        }

        public int GetHashCode(Vector2 obj)
        {
            throw new NotImplementedException();
        }
    }

    public class Vector3Comparer : IEqualityComparer<Vector3>
    {
        static public Vector3Comparer Epsilon = new Vector3Comparer(0.000001f);

        private readonly float _epsilon;

        private Vector3Comparer(float epsilon)
        {
            _epsilon = epsilon;
        }

        public bool Equals(Vector3 x, Vector3 y)
        {
            return Math.Abs(x.X - y.X) < _epsilon &&
                   Math.Abs(x.Y - y.Y) < _epsilon &&
                   Math.Abs(x.Z - y.Z) < _epsilon;
        }

        public int GetHashCode(Vector3 obj)
        {
            throw new NotImplementedException();
        }
    }

    public class Vector4Comparer : IEqualityComparer<Vector4>
    {
        static public Vector4Comparer Epsilon = new Vector4Comparer(0.000001f);

        private readonly float _epsilon;

        private Vector4Comparer(float epsilon)
        {
            _epsilon = epsilon;
        }

        public bool Equals(Vector4 x, Vector4 y)
        {
            return Math.Abs(x.X - y.X) < _epsilon &&
                   Math.Abs(x.Y - y.Y) < _epsilon &&
                   Math.Abs(x.Z - y.Z) < _epsilon &&
                   Math.Abs(x.W - y.W) < _epsilon;
        }

        public int GetHashCode(Vector4 obj)
        {
            throw new NotImplementedException();
        }
    }

    public class QuaternionComparer : IEqualityComparer<Quaternion>
    {
        static public QuaternionComparer Epsilon = new QuaternionComparer(0.000001f);

        private readonly float _epsilon;

        private QuaternionComparer(float epsilon)
        {
            _epsilon = epsilon;
        }

        public bool Equals(Quaternion x, Quaternion y)
        {
            return Math.Abs(x.X - y.X) < _epsilon &&
                   Math.Abs(x.Y - y.Y) < _epsilon &&
                   Math.Abs(x.Z - y.Z) < _epsilon &&
                   Math.Abs(x.W - y.W) < _epsilon;
        }

        public int GetHashCode(Quaternion obj)
        {
            throw new NotImplementedException();
        }
    }
    public class PlaneComparer : IEqualityComparer<Plane>
    {
        static public PlaneComparer Epsilon = new PlaneComparer(0.000001f);

        private readonly float _epsilon;

        private PlaneComparer(float epsilon)
        {
            _epsilon = epsilon;
        }

        public bool Equals(Plane x, Plane y)
        {
            return Math.Abs(x.Normal.X - y.Normal.X) < _epsilon &&
                   Math.Abs(x.Normal.Y - y.Normal.Y) < _epsilon &&
                   Math.Abs(x.Normal.Z - y.Normal.Z) < _epsilon &&
                   Math.Abs(x.D - y.D) < _epsilon;
        }

        public int GetHashCode(Plane obj)
        {
            throw new NotImplementedException();
        }
    }

    public static class ArrayUtil
    {
        public static T[] ConvertTo<T>(byte[] source) where T : struct
        {
            var sizeOfDest = Marshal.SizeOf(typeof(T));
            var count = source.Length / sizeOfDest;
            var dest = new T[count];

            var pinned = GCHandle.Alloc(source, GCHandleType.Pinned);
            var pointer = pinned.AddrOfPinnedObject();

            for (var i = 0; i < count; i++, pointer+=sizeOfDest)
                dest[i] = (T)Marshal.PtrToStructure(pointer, typeof(T));

            pinned.Free();

            return dest;
        }

        public static byte[] ConvertFrom<T>(T[] source) where T : struct
        {
            var sizeOfSource = Marshal.SizeOf(typeof(T));
            var count = source.Length;
            var dest = new byte[sizeOfSource * count];

            var pinned = GCHandle.Alloc(dest, GCHandleType.Pinned);
            var pointer = pinned.AddrOfPinnedObject();

            for (var i = 0; i < count; i++, pointer += sizeOfSource)
                Marshal.StructureToPtr(source[i], pointer, true);

            pinned.Free();

            return dest;
        }
    }

	static class MathUtility
    {
		public static void MinMax (int a, int b, out int min, out int max)
		{
			if (a > b)
            {
				min = b;
				max = a;
			}
            else
            {
				min = a;
				max = b;
			}
		}
	}

	static class Paths
    {
		private const string AssetFolder = "Assets";
        private static readonly string AudioFolder = Path.Combine(AssetFolder, "Audio");
        private static readonly string FontFolder = Path.Combine(AssetFolder, "Fonts");
		private static readonly string ReferenceImageFolder = Path.Combine (AssetFolder, "ReferenceImages");
		private static readonly string TextureFolder = Path.Combine (AssetFolder, "Textures");
		private static readonly string EffectFolder = Path.Combine (AssetFolder, "Effects");
		private static readonly string ModelFolder = Path.Combine (AssetFolder, "Models");
        private static readonly string XmlFolder = Path.Combine(AssetFolder, "Xml");
        private const string CapturedFrameFolder = "CapturedFrames";
		private const string CapturedFrameDiffFolder = "Diffs";

		public static string Asset (params string [] pathParts)
		{
			return Combine (AssetFolder, pathParts);
		}

        public static string Audio(params string[] pathParts)
        {
            return Combine(AudioFolder, pathParts);
        }

        public static string Font(params string[] pathParts)
		{
			return Combine (FontFolder, pathParts);
		}

		public static string Texture (params string [] pathParts)
		{
			return Combine (TextureFolder, pathParts);
		}

        public static string RawEffect(params string[] pathParts)
        {
            return Combine(EffectFolder, pathParts) + ".fx";
        }

		public static string CompiledEffect (params string [] pathParts)
		{
		    string type;
#if XNA
            type = "XNA";
#elif DIRECTX
            type = "DirectX";
#elif DESKTOPGL
            type = "OpenGL";
#else
            throw new Exception("Make sure the effect path is set up correctly for this platform!");
#endif
			var path = Combine(type, pathParts);
		    return Combine(EffectFolder, path);

		}

		public static string Model (params string [] pathParts)
		{
			return Combine (ModelFolder, pathParts);
		}

        public static string Xml(params string[] pathParts)
        {
            return Combine(XmlFolder, pathParts);
        }

		public static string ReferenceImage (params string [] pathParts)
		{
			return Combine (ReferenceImageFolder, pathParts);
		}

		public static string CapturedFrame (params string [] pathParts)
		{
			return Combine (CapturedFrameFolder, pathParts);
		}

		public static string CapturedFrameDiff (params string [] pathParts)
		{
			return Combine (CapturedFrameDiffFolder, pathParts);
		}


		private static string Combine (string head, params string [] tail)
		{
			return Path.Combine (head, Path.Combine (tail));
		}

		public static void SetStandardWorkingDirectory()
		{
            var directory = AppDomain.CurrentDomain.BaseDirectory;
			Directory.SetCurrentDirectory(directory);
		}

        public static void AreEqual(string expected, string actual)
        {
            expected = Path.GetFullPath(expected);
            actual = Path.GetFullPath(actual);            
            Assert.AreEqual(expected, actual, "Paths not equal!");
        }

	}
}