Nerfed/Nerfed.Runtime/Graphics/PackedVector/NormalizedByte4.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 NormalizedByte4 : IPackedVector<uint>, IEquatable<NormalizedByte4>
{
	#region Public Properties

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

	#endregion

	#region Private Variables

	private uint packedValue;

	#endregion

	#region Public Constructors

	public NormalizedByte4(Vector4 vector)
	{
		packedValue = Pack(vector.X, vector.Y, vector.Z, vector.W);
	}

	public NormalizedByte4(float x, float y, float z, float w)
	{
		packedValue = Pack(x, y, z, w);
	}

	#endregion

	#region Public Methods

	public Vector4 ToVector4()
	{
		return new Vector4(
			((sbyte) (packedValue & 0xFF)) / 127.0f,
			((sbyte) ((packedValue >> 8) & 0xFF)) / 127.0f,
			((sbyte) ((packedValue >> 16) & 0xFF)) / 127.0f,
			((sbyte) ((packedValue >> 24) & 0xFF)) / 127.0f
		);
	}

	#endregion

	#region IPackedVector Methods

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

	#endregion

	#region Public Static Operators and Override Methods

	public static bool operator !=(NormalizedByte4 a, NormalizedByte4 b)
	{
		return a.packedValue != b.packedValue;
	}

	public static bool operator ==(NormalizedByte4 a, NormalizedByte4 b)
	{
		return a.packedValue == b.packedValue;
	}

	public override bool Equals(object obj)
	{
		return (obj is NormalizedByte4) && Equals((NormalizedByte4) obj);
	}

	public bool Equals(NormalizedByte4 other)
	{
		return packedValue == 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, float z, float w)
	{
		uint byte4 = (
			(uint) System.Math.Round(Math.Clamp(x, -1.0f, 1.0f) * 127.0f)
		) & 0x000000FF;
		uint byte3 = (
			(
				(uint) System.Math.Round(Math.Clamp(y, -1.0f, 1.0f) * 127.0f)
			) << 8
		) & 0x0000FF00;
		uint byte2 = (
			(
				(uint) System.Math.Round(Math.Clamp(z, -1.0f, 1.0f) * 127.0f)
			) << 16
		) & 0x00FF0000;
		uint byte1 = (
			(
				(uint) System.Math.Round(Math.Clamp(w, -1.0f, 1.0f) * 127.0f)
			) << 24
		) & 0xFF000000;

		return byte4 | byte3 | byte2 | byte1;
	}

	#endregion
}