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// #region License
// /*
// Microsoft Public License (Ms-PL)
// MonoGame - Copyright © 2009 The MonoGame Team
//
// All rights reserved.
//
// This license governs use of the accompanying software. If you use the software, you accept this license. If you do not
// accept the license, do not use the software.
//
// 1. Definitions
// The terms "reproduce," "reproduction," "derivative works," and "distribution" have the same meaning here as under
// U.S. copyright law.
//
// A "contribution" is the original software, or any additions or changes to the software.
// A "contributor" is any person that distributes its contribution under this license.
// "Licensed patents" are a contributor's patent claims that read directly on its contribution.
//
// 2. Grant of Rights
// (A) Copyright Grant- Subject to the terms of this license, including the license conditions and limitations in section 3,
// each contributor grants you a non-exclusive, worldwide, royalty-free copyright license to reproduce its contribution, prepare derivative works of its contribution, and distribute its contribution or any derivative works that you create.
// (B) Patent Grant- Subject to the terms of this license, including the license conditions and limitations in section 3,
// each contributor grants you a non-exclusive, worldwide, royalty-free license under its licensed patents to make, have made, use, sell, offer for sale, import, and/or otherwise dispose of its contribution in the software or derivative works of the contribution in the software.
//
// 3. Conditions and Limitations
// (A) No Trademark License- This license does not grant you rights to use any contributors' name, logo, or trademarks.
// (B) If you bring a patent claim against any contributor over patents that you claim are infringed by the software,
// your patent license from such contributor to the software ends automatically.
// (C) If you distribute any portion of the software, you must retain all copyright, patent, trademark, and attribution
// notices that are present in the software.
// (D) If you distribute any portion of the software in source code form, you may do so only under this license by including
// a complete copy of this license with your distribution. If you distribute any portion of the software in compiled or object
// code form, you may only do so under a license that complies with this license.
// (E) The software is licensed "as-is." You bear the risk of using it. The contributors give no express warranties, guarantees
// or conditions. You may have additional consumer rights under your local laws which this license cannot change. To the extent
// permitted under your local laws, the contributors exclude the implied warranties of merchantability, fitness for a particular
// purpose and non-infringement.
// */
// #endregion License
//
// Author: Kenneth James Pouncey
using System;
namespace Microsoft.Xna.Framework.Graphics.PackedVector
{
public struct Short2 : IPackedVector<uint>, IEquatable<Short2>
{
private uint _short2Packed;
public Short2 (Vector2 vector)
{
_short2Packed = PackInTwo (vector.X, vector.Y);
}
public Short2 (Single x,Single y)
{
_short2Packed = PackInTwo (x, y);
}
public static bool operator !=(Short2 a, Short2 b)
{
return !a.Equals (b);
}
public static bool operator ==(Short2 a, Short2 b)
{
return a.Equals (b);
}
public uint PackedValue {
get {
return _short2Packed;
}
set {
_short2Packed = value;
}
}
public override bool Equals (object obj)
{
throw new NotImplementedException ();
}
public bool Equals (Short2 other)
{
throw new NotImplementedException ();
}
public override int GetHashCode ()
{
return _short2Packed.GetHashCode();
}
public override string ToString ()
{
// not sure what to return here
// microsoft returns some funky formatted string
return string.Format("{0} / {1}", (short)(_short2Packed & 0xFFFF), (short)(_short2Packed >> 0x10) );
}
public Vector2 ToVector2 ()
{
var v2 = new Vector2 ();
v2.X = (short)(_short2Packed & 0xFFFF);
v2.Y = (short)(_short2Packed >> 0x10);
return v2;
}
private static uint PackInTwo (float vectorX, float vectorY)
{
const float maxPos = 0x7FFF; // Largest two byte positive number 0xFFFF >> 1;
const float minNeg = ~(int)maxPos; // two's complement
// clamp the value between min and max values
var word2 = (uint)((int)Math.Max (Math.Min (vectorX, maxPos), minNeg) & 0xFFFF);
var word1 = (uint)(((int)Math.Max (Math.Min (vectorY, maxPos), minNeg) & 0xFFFF) << 0x10);
return (word2 | word1);
}
void IPackedVector.PackFromVector4 (Vector4 vector)
{
_short2Packed = Short2.PackInTwo (vector.X, vector.Y);
}
Vector4 IPackedVector.ToVector4 ()
{
var v4 = new Vector4 (0,0,0,1);
v4.X = (short)(_short2Packed & 0xFFFF);
v4.Y = (short)(_short2Packed >> 0x10);
return v4;
}
}
}
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