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feat: Half Floats (#3932)

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* System.Half

* reader/writer

* remove unused namespaces

* old c# support

* remove unnecessary nint

* 2019 fixes

---------

Co-authored-by: mischa <info@noobtuts.com>
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mischa 2024-10-25 10:15:37 +02:00 committed by GitHub
parent 549b222ec0
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2
Assets/Mirror/Core/NetworkReaderExtensions.cs
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@ -62,6 +62,8 @@ public static class NetworkReaderExtensions
public static decimal ReadDecimal(this NetworkReader reader) => reader.ReadBlittable<decimal>();
public static decimal? ReadDecimalNullable(this NetworkReader reader) => reader.ReadBlittableNullable<decimal>();
public static Half ReadHalf(this NetworkReader reader) => new Half(reader.ReadUShort());
/// <exception cref="T:System.ArgumentException">if an invalid utf8 string is sent</exception>
public static string ReadString(this NetworkReader reader)
{

2
Assets/Mirror/Core/NetworkWriterExtensions.cs
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@ -57,6 +57,8 @@ public static class NetworkWriterExtensions
public static void WriteDecimal(this NetworkWriter writer, decimal value) => writer.WriteBlittable(value);
public static void WriteDecimalNullable(this NetworkWriter writer, decimal? value) => writer.WriteBlittableNullable(value);
public static void WriteHalf(this NetworkWriter writer, Half value) => writer.WriteUShort(value._value);
public static void WriteString(this NetworkWriter writer, string value)
{
// we offset count by '1' to easily support null without writing another byte.

773
Assets/Mirror/Core/Tools/Half.cs Normal file
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@ -0,0 +1,773 @@
// half float from .NET 5:
// https://devblogs.microsoft.com/dotnet/introducing-the-half-type/
//
// drop in from dotnet/runtime source:
// https://github.com/dotnet/runtime/blob/e188d6ac90fe56320cca51c53709ef1c72f063d5/src/libraries/System.Private.CoreLib/src/System/Half.cs#L17
// removing all the stuff that's not in Unity though.
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Diagnostics;
using System.Globalization;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using UnityEngine;
namespace System
{
// Portions of the code implemented below are based on the 'Berkeley SoftFloat Release 3e' algorithms.
/// <summary>
/// Represents a half-precision floating-point number.
/// </summary>
[StructLayout(LayoutKind.Sequential)]
public readonly struct Half
: IComparable,
IComparable<Half>,
IEquatable<Half>
{
private const NumberStyles DefaultParseStyle = NumberStyles.Float | NumberStyles.AllowThousands;
// Constants for manipulating the private bit-representation
internal const ushort SignMask = 0x8000;
internal const int SignShift = 15;
internal const byte ShiftedSignMask = SignMask >> SignShift;
internal const ushort BiasedExponentMask = 0x7C00;
internal const int BiasedExponentShift = 10;
internal const int BiasedExponentLength = 5;
internal const byte ShiftedBiasedExponentMask = BiasedExponentMask >> BiasedExponentShift;
internal const ushort TrailingSignificandMask = 0x03FF;
internal const byte MinSign = 0;
internal const byte MaxSign = 1;
internal const byte MinBiasedExponent = 0x00;
internal const byte MaxBiasedExponent = 0x1F;
internal const byte ExponentBias = 15;
internal const sbyte MinExponent = -14;
internal const sbyte MaxExponent = +15;
internal const ushort MinTrailingSignificand = 0x0000;
internal const ushort MaxTrailingSignificand = 0x03FF;
internal const int TrailingSignificandLength = 10;
internal const int SignificandLength = TrailingSignificandLength + 1;
// Constants representing the private bit-representation for various default values
private const ushort PositiveZeroBits = 0x0000;
private const ushort NegativeZeroBits = 0x8000;
private const ushort EpsilonBits = 0x0001;
private const ushort PositiveInfinityBits = 0x7C00;
private const ushort NegativeInfinityBits = 0xFC00;
private const ushort PositiveQNaNBits = 0x7E00;
private const ushort NegativeQNaNBits = 0xFE00;
private const ushort MinValueBits = 0xFBFF;
private const ushort MaxValueBits = 0x7BFF;
private const ushort PositiveOneBits = 0x3C00;
private const ushort NegativeOneBits = 0xBC00;
private const ushort SmallestNormalBits = 0x0400;
private const ushort EBits = 0x4170;
private const ushort PiBits = 0x4248;
private const ushort TauBits = 0x4648;
// Well-defined and commonly used values
public static Half Epsilon => new Half(EpsilonBits); // 5.9604645E-08
public static Half PositiveInfinity => new Half(PositiveInfinityBits); // 1.0 / 0.0;
public static Half NegativeInfinity => new Half(NegativeInfinityBits); // -1.0 / 0.0
public static Half NaN => new Half(NegativeQNaNBits); // 0.0 / 0.0
public static Half MinValue => new Half(MinValueBits); // -65504
public static Half MaxValue => new Half(MaxValueBits); // 65504
internal readonly ushort _value; // internal representation
internal Half(ushort value)
{
_value = value;
}
private Half(bool sign, ushort exp, ushort sig) => _value = (ushort)(((sign ? 1 : 0) << SignShift) + (exp << BiasedExponentShift) + sig);
internal byte BiasedExponent
{
get
{
ushort bits = _value;
return ExtractBiasedExponentFromBits(bits);
}
}
internal sbyte Exponent
{
get
{
return (sbyte)(BiasedExponent - ExponentBias);
}
}
internal ushort Significand
{
get
{
return (ushort)(TrailingSignificand | ((BiasedExponent != 0) ? (1U << BiasedExponentShift) : 0U));
}
}
internal ushort TrailingSignificand
{
get
{
ushort bits = _value;
return ExtractTrailingSignificandFromBits(bits);
}
}
internal static byte ExtractBiasedExponentFromBits(ushort bits)
{
return (byte)((bits >> BiasedExponentShift) & ShiftedBiasedExponentMask);
}
internal static ushort ExtractTrailingSignificandFromBits(ushort bits)
{
return (ushort)(bits & TrailingSignificandMask);
}
public static bool operator <(Half left, Half right)
{
if (IsNaN(left) || IsNaN(right))
{
// IEEE defines that NaN is unordered with respect to everything, including itself.
return false;
}
bool leftIsNegative = IsNegative(left);
if (leftIsNegative != IsNegative(right))
{
// When the signs of left and right differ, we know that left is less than right if it is
// the negative value. The exception to this is if both values are zero, in which case IEEE
// says they should be equal, even if the signs differ.
return leftIsNegative && !AreZero(left, right);
}
return (left._value != right._value) && ((left._value < right._value) ^ leftIsNegative);
}
public static bool operator >(Half left, Half right)
{
return right < left;
}
public static bool operator <=(Half left, Half right)
{
if (IsNaN(left) || IsNaN(right))
{
// IEEE defines that NaN is unordered with respect to everything, including itself.
return false;
}
bool leftIsNegative = IsNegative(left);
if (leftIsNegative != IsNegative(right))
{
// When the signs of left and right differ, we know that left is less than right if it is
// the negative value. The exception to this is if both values are zero, in which case IEEE
// says they should be equal, even if the signs differ.
return leftIsNegative || AreZero(left, right);
}
return (left._value == right._value) || ((left._value < right._value) ^ leftIsNegative);
}
public static bool operator >=(Half left, Half right)
{
return right <= left;
}
public static bool operator ==(Half left, Half right)
{
if (IsNaN(left) || IsNaN(right))
{
// IEEE defines that NaN is not equal to anything, including itself.
return false;
}
// IEEE defines that positive and negative zero are equivalent.
return (left._value == right._value) || AreZero(left, right);
}
public static bool operator !=(Half left, Half right)
{
return !(left == right);
}
/// <summary>Determines whether the specified value is finite (zero, subnormal, or normal).</summary>
/// <remarks>This effectively checks the value is not NaN and not infinite.</remarks>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool IsFinite(Half value)
{
uint bits = value._value;
return (~bits & PositiveInfinityBits) != 0;
}
/// <summary>Determines whether the specified value is infinite.</summary>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool IsInfinity(Half value)
{
uint bits = value._value;
return (bits & ~SignMask) == PositiveInfinityBits;
}
/// <summary>Determines whether the specified value is NaN.</summary>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool IsNaN(Half value)
{
uint bits = value._value;
return (bits & ~SignMask) > PositiveInfinityBits;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
internal static bool IsNaNOrZero(Half value)
{
uint bits = value._value;
return ((bits - 1) & ~SignMask) >= PositiveInfinityBits;
}
/// <summary>Determines whether the specified value is negative.</summary>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool IsNegative(Half value)
{
return (short)(value._value) < 0;
}
/// <summary>Determines whether the specified value is negative infinity.</summary>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool IsNegativeInfinity(Half value)
{
return value._value == NegativeInfinityBits;
}
/// <summary>Determines whether the specified value is normal (finite, but not zero or subnormal).</summary>
/// <remarks>This effectively checks the value is not NaN, not infinite, not subnormal, and not zero.</remarks>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool IsNormal(Half value)
{
uint bits = value._value;
return (ushort)((bits & ~SignMask) - SmallestNormalBits) < (PositiveInfinityBits - SmallestNormalBits);
}
/// <summary>Determines whether the specified value is positive infinity.</summary>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool IsPositiveInfinity(Half value)
{
return value._value == PositiveInfinityBits;
}
/// <summary>Determines whether the specified value is subnormal (finite, but not zero or normal).</summary>
/// <remarks>This effectively checks the value is not NaN, not infinite, not normal, and not zero.</remarks>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool IsSubnormal(Half value)
{
uint bits = value._value;
return (ushort)((bits & ~SignMask) - 1) < MaxTrailingSignificand;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
internal static bool IsZero(Half value)
{
uint bits = value._value;
return (bits & ~SignMask) == 0;
}
private static bool AreZero(Half left, Half right)
{
// IEEE defines that positive and negative zero are equal, this gives us a quick equality check
// for two values by or'ing the private bits together and stripping the sign. They are both zero,
// and therefore equivalent, if the resulting value is still zero.
return ((left._value | right._value) & ~SignMask) == 0;
}
/// <summary>
/// Compares this object to another object, returning an integer that indicates the relationship.
/// </summary>
/// <returns>A value less than zero if this is less than <paramref name="obj"/>, zero if this is equal to <paramref name="obj"/>, or a value greater than zero if this is greater than <paramref name="obj"/>.</returns>
public int CompareTo(object obj)
{
if (obj is Half other)
{
return CompareTo(other);
}
return (obj is null) ? 1 : throw new ArgumentException("SR.Arg_MustBeHalf");
}
/// <summary>
/// Compares this object to another object, returning an integer that indicates the relationship.
/// </summary>
/// <returns>A value less than zero if this is less than <paramref name="other"/>, zero if this is equal to <paramref name="other"/>, or a value greater than zero if this is greater than <paramref name="other"/>.</returns>
public int CompareTo(Half other)
{
if (this < other)
{
return -1;
}
if (this > other)
{
return 1;
}
if (this == other)
{
return 0;
}
if (IsNaN(this))
{
return IsNaN(other) ? 0 : -1;
}
return 1;
}
/// <summary>
/// Returns a value that indicates whether this instance is equal to a specified <paramref name="obj"/>.
/// </summary>
public override bool Equals(object obj)
{
return (obj is Half other) && Equals(other);
}
/// <summary>
/// Returns a value that indicates whether this instance is equal to a specified <paramref name="other"/> value.
/// </summary>
public bool Equals(Half other)
{
return _value == other._value
|| AreZero(this, other)
|| (IsNaN(this) && IsNaN(other));
}
/// <summary>
/// Serves as the default hash function.
/// </summary>
public override int GetHashCode()
{
uint bits = _value;
if (IsNaNOrZero(this))
{
// Ensure that all NaNs and both zeros have the same hash code
bits &= PositiveInfinityBits;
}
return (int)bits;
}
/// <summary>
/// Returns a string representation of the current value.
/// </summary>
public override string ToString()
{
return ((float)this).ToString();
}
//
// Explicit Convert To Half
//
/// <summary>Explicitly converts a <see cref="char" /> value to its nearest representable half-precision floating-point value.</summary>
public static explicit operator Half(char value) => (Half)(float)value;
/// <summary>Explicitly converts a <see cref="decimal" /> value to its nearest representable half-precision floating-point value.</summary>
public static explicit operator Half(decimal value) => (Half)(float)value;
/// <summary>Explicitly converts a <see cref="short" /> value to its nearest representable half-precision floating-point value.</summary>
/// <returns><paramref name="value" /> converted to its nearest representable half-precision floating-point value.</returns>
public static explicit operator Half(short value) => (Half)(float)value;
/// <summary>Explicitly converts a <see cref="int" /> value to its nearest representable half-precision floating-point value.</summary>
/// <returns><paramref name="value" /> converted to its nearest representable half-precision floating-point value.</returns>
public static explicit operator Half(int value) => (Half)(float)value;
/// <summary>Explicitly converts a <see cref="long" /> value to its nearest representable half-precision floating-point value.</summary>
/// <returns><paramref name="value" /> converted to its nearest representable half-precision floating-point value.</returns>
public static explicit operator Half(long value) => (Half)(float)value;
/// <summary>Explicitly converts a <see cref="float" /> value to its nearest representable half-precision floating-point value.</summary>
/// <returns><paramref name="value" /> converted to its nearest representable half-precision floating-point value.</returns>
public static explicit operator Half(float value)
{
// Unity implement this!
return new Half(Mathf.FloatToHalf(value));
}
/// <summary>Explicitly converts a <see cref="ushort" /> value to its nearest representable half-precision floating-point value.</summary>
/// <returns><paramref name="value" /> converted to its nearest representable half-precision floating-point value.</returns>
public static explicit operator Half(ushort value) => (Half)(float)value;
/// <summary>Explicitly converts a <see cref="uint" /> value to its nearest representable half-precision floating-point value.</summary>
/// <returns><paramref name="value" /> converted to its nearest representable half-precision floating-point value.</returns>
public static explicit operator Half(uint value) => (Half)(float)value;
/// <summary>Explicitly converts a <see cref="ulong" /> value to its nearest representable half-precision floating-point value.</summary>
/// <returns><paramref name="value" /> converted to its nearest representable half-precision floating-point value.</returns>
public static explicit operator Half(ulong value) => (Half)(float)value;
//
// Explicit Convert From Half
//
/// <summary>Explicitly converts a half-precision floating-point value to its nearest representable <see cref="byte" /> value.</summary>
/// <returns><paramref name="value" /> converted to its nearest representable <see cref="byte" /> value.</returns>
public static explicit operator byte(Half value) => (byte)(float)value;
/// <summary>Explicitly converts a half-precision floating-point value to its nearest representable <see cref="char" /> value.</summary>
/// <returns><paramref name="value" /> converted to its nearest representable <see cref="char" /> value.</returns>
public static explicit operator char(Half value) => (char)(float)value;
/// <summary>Explicitly converts a half-precision floating-point value to its nearest representable <see cref="decimal" /> value.</summary>
/// <returns><paramref name="value" /> converted to its nearest representable <see cref="decimal" /> value.</returns>
public static explicit operator decimal(Half value) => (decimal)(float)value;
/// <summary>Explicitly converts a half-precision floating-point value to its nearest representable <see cref="short" /> value.</summary>
/// <returns><paramref name="value" /> converted to its nearest representable <see cref="short" /> value.</returns>
public static explicit operator short(Half value) => (short)(float)value;
/// <summary>Explicitly converts a half-precision floating-point value to its nearest representable <see cref="int" /> value.</summary>
/// <returns><paramref name="value" /> converted to its nearest representable <see cref="int" /> value.</returns>
public static explicit operator int(Half value) => (int)(float)value;
/// <summary>Explicitly converts a half-precision floating-point value to its nearest representable <see cref="long" /> value.</summary>
/// <returns><paramref name="value" /> converted to its nearest representable <see cref="long" /> value.</returns>
public static explicit operator long(Half value) => (long)(float)value;
/// <summary>Explicitly converts a half-precision floating-point value to its nearest representable <see cref="sbyte" /> value.</summary>
/// <returns><paramref name="value" /> converted to its nearest representable <see cref="sbyte" /> value.</returns>
public static explicit operator sbyte(Half value) => (sbyte)(float)value;
/// <summary>Explicitly converts a half-precision floating-point value to its nearest representable <see cref="ushort" /> value.</summary>
/// <returns><paramref name="value" /> converted to its nearest representable <see cref="ushort" /> value.</returns>
public static explicit operator ushort(Half value) => (ushort)(float)value;
/// <summary>Explicitly converts a half-precision floating-point value to its nearest representable <see cref="uint" /> value.</summary>
/// <returns><paramref name="value" /> converted to its nearest representable <see cref="uint" /> value.</returns>
public static explicit operator uint(Half value) => (uint)(float)value;
/// <summary>Explicitly converts a half-precision floating-point value to its nearest representable <see cref="ulong" /> value.</summary>
/// <returns><paramref name="value" /> converted to its nearest representable <see cref="ulong" /> value.</returns>
public static explicit operator ulong(Half value) => (ulong)(float)value;
//
// Implicit Convert To Half
//
/// <summary>Implicitly converts a <see cref="byte" /> value to its nearest representable half-precision floating-point value.</summary>
/// <returns><paramref name="value" /> converted to its nearest representable half-precision floating-point value.</returns>
public static implicit operator Half(byte value) => (Half)(float)value;
/// <summary>Implicitly converts a <see cref="sbyte" /> value to its nearest representable half-precision floating-point value.</summary>
/// <returns><paramref name="value" /> converted to its nearest representable half-precision floating-point value.</returns>
public static implicit operator Half(sbyte value) => (Half)(float)value;
/// <summary>Explicitly converts a half-precision floating-point value to its nearest representable <see cref="float" /> value.</summary>
/// <returns><paramref name="value" /> converted to its nearest representable <see cref="float" /> value.</returns>
public static explicit operator float(Half value)
{
return Mathf.HalfToFloat(value._value);
}
// IEEE 754 specifies NaNs to be propagated
internal static Half Negate(Half value)
{
return IsNaN(value) ? value : new Half((ushort)(value._value ^ SignMask));
}
public static Half operator +(Half left, Half right) => (Half)((float)left + (float)right);
//
// IDecrementOperators
//
public static Half operator --(Half value)
{
var tmp = (float)value;
--tmp;
return (Half)tmp;
}
//
// IDivisionOperators
//
public static Half operator /(Half left, Half right) => (Half)((float)left / (float)right);
//
// IExponentialFunctions
//
public static Half Exp(Half x) => (Half)Math.Exp((float)x);
//
// IFloatingPoint
//
public static Half Ceiling(Half x) => (Half)Math.Ceiling((float)x);
public static Half Floor(Half x) => (Half)Math.Floor((float)x);
public static Half Round(Half x) => (Half)Math.Round((float)x);
public static Half Round(Half x, int digits) => (Half)Math.Round((float)x, digits);
public static Half Round(Half x, MidpointRounding mode) => (Half)Math.Round((float)x, mode);
public static Half Round(Half x, int digits, MidpointRounding mode) => (Half)Math.Round((float)x, digits, mode);
public static Half Truncate(Half x) => (Half)Math.Truncate((float)x);
//
// IFloatingPointConstants
//
public static Half E => new Half(EBits);
public static Half Pi => new Half(PiBits);
public static Half Tau => new Half(TauBits);
//
// IFloatingPointIeee754
//
public static Half NegativeZero => new Half(NegativeZeroBits);
public static Half Atan2(Half y, Half x) => (Half)Math.Atan2((float)y, (float)x);
public static Half Lerp(Half value1, Half value2, Half amount) => (Half)Mathf.Lerp((float)value1, (float)value2, (float)amount);
//
// IHyperbolicFunctions
//
public static Half Cosh(Half x) => (Half)Math.Cosh((float)x);
public static Half Sinh(Half x) => (Half)Math.Sinh((float)x);
public static Half Tanh(Half x) => (Half)Math.Tanh((float)x);
//
// IIncrementOperators
//
public static Half operator ++(Half value)
{
var tmp = (float)value;
++tmp;
return (Half)tmp;
}
//
// ILogarithmicFunctions
//
public static Half Log(Half x) => (Half)Math.Log((float)x);
public static Half Log(Half x, Half newBase) => (Half)Math.Log((float)x, (float)newBase);
//
// IModulusOperators
//
public static Half operator %(Half left, Half right) => (Half)((float)left % (float)right);
//
// IMultiplicativeIdentity
//
public static Half MultiplicativeIdentity => new Half(PositiveOneBits);
//
// IMultiplyOperators
//
public static Half operator *(Half left, Half right) => (Half)((float)left * (float)right);
//
// INumber
//
public static Half Clamp(Half value, Half min, Half max) => (Half)Mathf.Clamp((float)value, (float)min, (float)max);
public static Half CopySign(Half value, Half sign)
{
// This method is required to work for all inputs,
// including NaN, so we operate on the raw bits.
uint xbits = value._value;
uint ybits = sign._value;
// Remove the sign from x, and remove everything but the sign from y
// Then, simply OR them to get the correct sign
return new Half((ushort)((xbits & ~SignMask) | (ybits & SignMask)));
}
public static Half Max(Half x, Half y) => (Half)Math.Max((float)x, (float)y);
public static Half MaxNumber(Half x, Half y)
{
// This matches the IEEE 754:2019 `maximumNumber` function
//
// It does not propagate NaN inputs back to the caller and
// otherwise returns the larger of the inputs. It
// treats +0 as larger than -0 as per the specification.
if (x != y)
{
if (!IsNaN(y))
{
return y < x ? x : y;
}
return x;
}
return IsNegative(y) ? x : y;
}
public static Half Min(Half x, Half y) => (Half)Math.Min((float)x, (float)y);
public static Half MinNumber(Half x, Half y)
{
// This matches the IEEE 754:2019 `minimumNumber` function
//
// It does not propagate NaN inputs back to the caller and
// otherwise returns the larger of the inputs. It
// treats +0 as larger than -0 as per the specification.
if (x != y)
{
if (!IsNaN(y))
{
return x < y ? x : y;
}
return x;
}
return IsNegative(x) ? x : y;
}
public static int Sign(Half value)
{
if (IsNaN(value))
{
throw new ArithmeticException("SR.Arithmetic_NaN");
}
if (IsZero(value))
{
return 0;
}
else if (IsNegative(value))
{
return -1;
}
return +1;
}
//
// INumberBase
//
public static Half One => new Half(PositiveOneBits);
public static Half Zero => new Half(PositiveZeroBits);
public static Half Abs(Half value) => new Half((ushort)(value._value & ~SignMask));
public static bool IsPositive(Half value) => (short)(value._value) >= 0;
public static bool IsRealNumber(Half value)
{
// A NaN will never equal itself so this is an
// easy and efficient way to check for a real number.
#pragma warning disable CS1718
return value == value;
#pragma warning restore CS1718
}
//
// IPowerFunctions
//
public static Half Pow(Half x, Half y) => (Half)Math.Pow((float)x, (float)y);
//
// IRootFunctions
//
public static Half Sqrt(Half x) => (Half)Math.Sqrt((float)x);
//
// ISignedNumber
//
public static Half NegativeOne => new Half(NegativeOneBits);
//
// ISubtractionOperators
//
public static Half operator -(Half left, Half right) => (Half)((float)left - (float)right);
//
// ITrigonometricFunctions
//
public static Half Acos(Half x) => (Half)Math.Acos((float)x);
public static Half Asin(Half x) => (Half)Math.Asin((float)x);
public static Half Atan(Half x) => (Half)Math.Atan((float)x);
public static Half Cos(Half x) => (Half)Math.Cos((float)x);
public static Half Sin(Half x) => (Half)Math.Sin((float)x);
public static Half Tan(Half x) => (Half)Math.Tan((float)x);
//
// IUnaryNegationOperators
//
public static Half operator -(Half value) => (Half)(-(float)value);
//
// IUnaryPlusOperators
//
public static Half operator +(Half value) => value;
}
}

3
Assets/Mirror/Core/Tools/Half.cs.meta Normal file
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@ -0,0 +1,3 @@
fileFormatVersion: 2
guid: 70b5947c49174f3c90121edd21ea6b15
timeCreated: 1729783714

35
Assets/Mirror/Tests/Editor/Tools/HalfTests.cs Normal file
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@ -0,0 +1,35 @@
// we are using the dotnet/runtime implementation which is already tested.
// basic test to ensure it generally works as expected.
using System;
using NUnit.Framework;
namespace Mirror.Tests.Tools
{
public class HalfTests
{
[Test]
public void BasicTest()
{
// start from a float
Half half = (Half)42.0f;
Half other = (Half)0.5f;
// add
Half value = half + other;
Assert.That((float)value, Is.EqualTo(42.5f));
// sub
value = half - other;
Assert.That((float)value, Is.EqualTo(41.5f));
// compare
Assert.That(half < other, Is.False);
Assert.That(half > other, Is.True);
Assert.That(half == other, Is.False);
Assert.That(half != other, Is.True);
Assert.That(half, Is.EqualTo((Half)42.0f));
Assert.That(half == (Half)42.0f, Is.True);
}
}
}

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