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https://github.com/oliverbooth/X10D
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feat: add MathUtility.Bias (#60)
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@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
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- Added new library X10D.Hosting.
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- Added .NET 7 target.
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- X10D: Added `IntrinsicExtensions` and `IntrinsicUtility` which offer methods for vectors in `System.Runtime.Instrinsics`. (#70)
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- X10D: Added `MathUtility.Bias(float, float)`.
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- X10D: Added `MathUtility.InverseLerp(float, float, float)` and `MathUtility.InverseLerp(double, double, double)`
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- X10D: Added `MathUtility.ScaleRange(float, float, float, float, float)`
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and `MathUtility.ScaleRange(double, double, double, double, double)`
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@ -9,6 +9,41 @@ namespace X10D.Tests.Math;
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[TestClass]
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public class MathUtilityTests
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{
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[TestMethod]
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public void Bias_ReturnsCorrectResult_WhenBiasIsLessThanPointFive()
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{
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const float value = 0.5f;
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const float bias = 0.3f;
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const float expected = 0.3f;
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float result = MathUtility.Bias(value, bias);
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Assert.AreEqual(expected, result, 1e-6f);
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}
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[TestMethod]
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public void Bias_ReturnsCorrectResult_WhenBiasIsEqualToPointFive()
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{
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const float value = 0.5f;
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const float bias = 0.5f;
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float result = MathUtility.Bias(value, bias);
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Assert.AreEqual(value, result, 1e-6f);
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}
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[TestMethod]
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public void Bias_ReturnsCorrectResult_WhenBiasIsGreaterThanPointFive()
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{
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const float value = 0.5f;
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const float bias = 0.8f;
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const float expected = 0.8f;
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float result = MathUtility.Bias(value, bias);
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Assert.AreEqual(expected, result, 1e-6f);
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}
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[TestMethod]
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public void GammaToLinear_ShouldReturnQuarter_GivenQuarterAndGamma1()
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{
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@ -11,6 +11,20 @@ public static class MathUtility
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private const double DefaultGamma = 2.2;
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private const float DefaultGammaF = 2.2f;
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/// <summary>
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/// Applies a simple bias function to value.
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/// </summary>
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/// <param name="value">The value to which the bias function will be applied.</param>
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/// <param name="bias">The bias value. Valid values range from 0-1.</param>
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/// <returns>The biased result.</returns>
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/// <remarks>
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/// If <paramref name="bias" /> is less than 0.5, <paramref name="value" /> will be shifted downward; otherwise, upward.
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/// </remarks>
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public static float Bias(float value, float bias)
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{
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return value / ((1.0f / bias - 2.0f) * (1.0f - value) + 1.0f);
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}
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/// <summary>
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/// Converts a gamma-encoded value to a linear value using a gamma value of <c>2.2</c>.
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/// </summary>
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