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https://github.com/Milxnor/Project-Reboot-3.0.git
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44 lines
1.1 KiB
C++
44 lines
1.1 KiB
C++
#pragma once
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#include "GenericPlatformMath.h"
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struct FMath : public FGenericPlatformMath
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{
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template< class T >
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static FORCEINLINE T Clamp(const T X, const T Min, const T Max)
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{
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return X < Min ? Min : X < Max ? X : Max;
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}
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template< class T >
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static FORCEINLINE T Square(const T A)
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{
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return A * A;
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}
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#define FASTASIN_HALF_PI (1.5707963050f)
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/**
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* Computes the ASin of a scalar value.
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*
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* @param Value input angle
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* @return ASin of Value
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*/
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static FORCEINLINE float FastAsin(float Value)
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{
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// Clamp input to [-1,1].
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bool nonnegative = (Value >= 0.0f);
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float x = FMath::Abs(Value);
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float omx = 1.0f - x;
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if (omx < 0.0f)
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{
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omx = 0.0f;
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}
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float root = FMath::Sqrt(omx);
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// 7-degree minimax approximation
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float result = ((((((-0.0012624911f * x + 0.0066700901f) * x - 0.0170881256f) * x + 0.0308918810f) * x - 0.0501743046f) * x + 0.0889789874f) * x - 0.2145988016f) * x + FASTASIN_HALF_PI;
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result *= root; // acos(|x|)
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// acos(x) = pi - acos(-x) when x < 0, asin(x) = pi/2 - acos(x)
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return (nonnegative ? FASTASIN_HALF_PI - result : result - FASTASIN_HALF_PI);
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}
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#undef FASTASIN_HALF_PI
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}; |