Nerfed/Nerfed.Runtime/Graphics/PackedVector/NormalizedShort2.cs

#region License

/* MoonWorks - Game Development Framework
 * Copyright 2021 Evan Hemsley
 */

/* Derived from code by Ethan Lee (Copyright 2009-2021).
 * Released under the Microsoft Public License.
 * See fna.LICENSE for details.

 * Derived from code by the Mono.Xna Team (Copyright 2006).
 * Released under the MIT License. See monoxna.LICENSE for details.
 */

#endregion

#region Using Statements
using System;
using System.Numerics;
#endregion

namespace Nerfed.Runtime.Graphics.PackedVector;

public struct NormalizedShort2 : IPackedVector<uint>, IEquatable<NormalizedShort2>
{
	#region Public Properties

	public uint PackedValue
	{
		get
		{
			return packedValue;
		}
		set
		{
			packedValue = value;
		}
	}

	#endregion

	#region Private Variables

	private uint packedValue;

	#endregion

	#region Public Constructors

	public NormalizedShort2(Vector2 vector)
	{
		packedValue = Pack(vector.X, vector.Y);
	}

	public NormalizedShort2(float x, float y)
	{
		packedValue = Pack(x, y);
	}

	#endregion

	#region Public Methods

	public Vector2 ToVector2()
	{
		const float maxVal = 0x7FFF;

		return new Vector2(
			(short) (packedValue & 0xFFFF) / maxVal,
			(short) (packedValue >> 0x10) / maxVal
		);
	}

	#endregion

	#region IPackedVector Methods

	void IPackedVector.PackFromVector4(Vector4 vector)
	{
		packedValue = Pack(vector.X, vector.Y);
	}

	Vector4 IPackedVector.ToVector4()
	{
		return new Vector4(ToVector2(), 0.0f, 1.0f);
	}

	#endregion

	#region Public Static Operators and Override Methods

	public static bool operator !=(NormalizedShort2 a, NormalizedShort2 b)
	{
		return !a.Equals(b);
	}

	public static bool operator ==(NormalizedShort2 a, NormalizedShort2 b)
	{
		return a.Equals(b);
	}

	public override bool Equals(object obj)
	{
		return (obj is NormalizedShort2) && Equals((NormalizedShort2) obj);
	}

	public bool Equals(NormalizedShort2 other)
	{
		return packedValue.Equals(other.packedValue);
	}

	public override int GetHashCode()
	{
		return packedValue.GetHashCode();
	}

	public override string ToString()
	{
		return packedValue.ToString("X");
	}

	#endregion

	#region Private Static Pack Method

	private static uint Pack(float x, float y)
	{
		const float max = 0x7FFF;
		const float min = -max;

		uint word2 = (uint) (
			(int) Math.Clamp(
				(float) System.Math.Round(x * max),
				min,
				max
			) & 0xFFFF
		);
		uint word1 = (uint) ((
			(int) Math.Clamp(
				(float) System.Math.Round(y * max),
				min,
				max
			) & 0xFFFF
		) << 0x10);

		return (word2 | word1);
	}

	#endregion
}