#region License
#endregion
#region Using Statements
using System;
#endregion
namespace Microsoft.Xna.Framework.Graphics.PackedVector
{
/// <summary>
/// Packed vector type containing unsigned normalized values, ranging from 0 to 1, using
/// 4 bits each for x, y, z, and w.
/// </summary>
public struct Bgra4444 : IPackedVector<UInt16>, IEquatable<Bgra4444>
{
#region Public Properties
/// <summary>
/// Gets and sets the packed value.
/// </summary>
[CLSCompliant(false)]
public UInt16 PackedValue
{
get
{
return packedValue;
}
set
{
packedValue = value;
}
}
#endregion
#region Private Variables
private UInt16 packedValue;
#endregion
#region Public Constructors
/// <summary>
/// Creates a new instance of Bgra4444.
/// </summary>
/// <param name="x">The x component</param>
/// <param name="y">The y component</param>
/// <param name="z">The z component</param>
/// <param name="w">The w component</param>
public Bgra4444(float x, float y, float z, float w)
{
packedValue = Pack(x, y, z, w);
}
/// <summary>
/// Creates a new instance of Bgra4444.
/// </summary>
/// <param name="vector">
/// Vector containing the components for the packed vector.
/// </param>
public Bgra4444(Vector4 vector)
{
packedValue = Pack(vector.X, vector.Y, vector.Z, vector.W);
}
#endregion
#region Public Methods
/// <summary>
/// Gets the packed vector in Vector4 format.
/// </summary>
/// <returns>The packed vector in Vector4 format</returns>
public Vector4 ToVector4()
{
const float maxVal = 1 / 15.0f;
return new Vector4(
((packedValue >> 8) & 0x0F) * maxVal,
((packedValue >> 4) & 0x0F) * maxVal,
(packedValue & 0x0F) * maxVal,
((packedValue >> 12) & 0x0F) * maxVal
);
}
#endregion
#region IPackedVector Methods
/// <summary>
/// Sets the packed vector from a Vector4.
/// </summary>
/// <param name="vector">Vector containing the components.</param>
void IPackedVector.PackFromVector4(Vector4 vector)
{
packedValue = Pack(vector.X, vector.Y, vector.Z, vector.W);
}
#endregion
#region Public Static Operators and Override Methods
/// <summary>
/// Compares an object with the packed vector.
/// </summary>
/// <param name="obj">The object to compare.</param>
/// <returns>True if the object is equal to the packed vector.</returns>
public override bool Equals(object obj)
{
return (obj is Bgra4444) && Equals((Bgra4444) obj);
}
/// <summary>
/// Compares another Bgra4444 packed vector with the packed vector.
/// </summary>
/// <param name="other">The Bgra4444 packed vector to compare.</param>
/// <returns>True if the packed vectors are equal.</returns>
public bool Equals(Bgra4444 other)
{
return packedValue == other.packedValue;
}
/// <summary>
/// Gets a string representation of the packed vector.
/// </summary>
/// <returns>A string representation of the packed vector.</returns>
public override string ToString()
{
return ToVector4().ToString();
}
/// <summary>
/// Gets a hash code of the packed vector.
/// </summary>
/// <returns>The hash code for the packed vector.</returns>
public override int GetHashCode()
{
return packedValue.GetHashCode();
}
public static bool operator ==(Bgra4444 lhs, Bgra4444 rhs)
{
return lhs.packedValue == rhs.packedValue;
}
public static bool operator !=(Bgra4444 lhs, Bgra4444 rhs)
{
return lhs.packedValue != rhs.packedValue;
}
#endregion
#region Private Static Pack Method
private static UInt16 Pack(float x, float y, float z, float w)
{
return (UInt16) (
(((int) (MathHelper.Clamp(w, 0, 1) * 15.0f) & 0x0F) << 12) |
(((int) (MathHelper.Clamp(x, 0, 1) * 15.0f) & 0x0F) << 8) |
(((int) (MathHelper.Clamp(y, 0, 1) * 15.0f) & 0x0F) << 4) |
((int) (MathHelper.Clamp(z, 0, 1) * 15.0f) & 0x0F)
);
}
#endregion
}
}
