From a8b3118e8305fd1c668ea25e07157b625c9747ff Mon Sep 17 00:00:00 2001
From: Joursoir <chat@joursoir.net>
Date: Sat, 10 Apr 2021 17:29:02 +0000
Subject: add glm headers

---
 src/include/glm/gtx/fast_trigonometry.inl | 142 ++++++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 src/include/glm/gtx/fast_trigonometry.inl

(limited to 'src/include/glm/gtx/fast_trigonometry.inl')

diff --git a/src/include/glm/gtx/fast_trigonometry.inl b/src/include/glm/gtx/fast_trigonometry.inl
new file mode 100644
index 0000000..6bb9237
--- /dev/null
+++ b/src/include/glm/gtx/fast_trigonometry.inl
@@ -0,0 +1,142 @@
+/// @ref gtx_fast_trigonometry
+
+namespace glm{
+namespace detail
+{
+	template<length_t L, typename T, qualifier Q>
+	GLM_FUNC_QUALIFIER vec<L, T, Q> taylorCos(vec<L, T, Q> const& x)
+	{
+		return static_cast<T>(1)
+			- (x * x) * (1.f / 2.f)
+			+ ((x * x) * (x * x)) * (1.f / 24.f)
+			- (((x * x) * (x * x)) * (x * x)) * (1.f / 720.f)
+			+ (((x * x) * (x * x)) * ((x * x) * (x * x))) * (1.f / 40320.f);
+	}
+
+	template<typename T>
+	GLM_FUNC_QUALIFIER T cos_52s(T x)
+	{
+		T const xx(x * x);
+		return (T(0.9999932946) + xx * (T(-0.4999124376) + xx * (T(0.0414877472) + xx * T(-0.0012712095))));
+	}
+
+	template<length_t L, typename T, qualifier Q>
+	GLM_FUNC_QUALIFIER vec<L, T, Q> cos_52s(vec<L, T, Q> const& x)
+	{
+		return detail::functor1<vec, L, T, T, Q>::call(cos_52s, x);
+	}
+}//namespace detail
+
+	// wrapAngle
+	template<typename T>
+	GLM_FUNC_QUALIFIER T wrapAngle(T angle)
+	{
+		return abs<T>(mod<T>(angle, two_pi<T>()));
+	}
+
+	template<length_t L, typename T, qualifier Q>
+	GLM_FUNC_QUALIFIER vec<L, T, Q> wrapAngle(vec<L, T, Q> const& x)
+	{
+		return detail::functor1<vec, L, T, T, Q>::call(wrapAngle, x);
+	}
+
+	// cos
+	template<typename T>
+	GLM_FUNC_QUALIFIER T fastCos(T x)
+	{
+		T const angle(wrapAngle<T>(x));
+
+		if(angle < half_pi<T>())
+			return detail::cos_52s(angle);
+		if(angle < pi<T>())
+			return -detail::cos_52s(pi<T>() - angle);
+		if(angle < (T(3) * half_pi<T>()))
+			return -detail::cos_52s(angle - pi<T>());
+
+		return detail::cos_52s(two_pi<T>() - angle);
+	}
+
+	template<length_t L, typename T, qualifier Q>
+	GLM_FUNC_QUALIFIER vec<L, T, Q> fastCos(vec<L, T, Q> const& x)
+	{
+		return detail::functor1<vec, L, T, T, Q>::call(fastCos, x);
+	}
+
+	// sin
+	template<typename T>
+	GLM_FUNC_QUALIFIER T fastSin(T x)
+	{
+		return fastCos<T>(half_pi<T>() - x);
+	}
+
+	template<length_t L, typename T, qualifier Q>
+	GLM_FUNC_QUALIFIER vec<L, T, Q> fastSin(vec<L, T, Q> const& x)
+	{
+		return detail::functor1<vec, L, T, T, Q>::call(fastSin, x);
+	}
+
+	// tan
+	template<typename T>
+	GLM_FUNC_QUALIFIER T fastTan(T x)
+	{
+		return x + (x * x * x * T(0.3333333333)) + (x * x * x * x * x * T(0.1333333333333)) + (x * x * x * x * x * x * x * T(0.0539682539));
+	}
+
+	template<length_t L, typename T, qualifier Q>
+	GLM_FUNC_QUALIFIER vec<L, T, Q> fastTan(vec<L, T, Q> const& x)
+	{
+		return detail::functor1<vec, L, T, T, Q>::call(fastTan, x);
+	}
+
+	// asin
+	template<typename T>
+	GLM_FUNC_QUALIFIER T fastAsin(T x)
+	{
+		return x + (x * x * x * T(0.166666667)) + (x * x * x * x * x * T(0.075)) + (x * x * x * x * x * x * x * T(0.0446428571)) + (x * x * x * x * x * x * x * x * x * T(0.0303819444));// + (x * x * x * x * x * x * x * x * x * x * x * T(0.022372159));
+	}
+
+	template<length_t L, typename T, qualifier Q>
+	GLM_FUNC_QUALIFIER vec<L, T, Q> fastAsin(vec<L, T, Q> const& x)
+	{
+		return detail::functor1<vec, L, T, T, Q>::call(fastAsin, x);
+	}
+
+	// acos
+	template<typename T>
+	GLM_FUNC_QUALIFIER T fastAcos(T x)
+	{
+		return T(1.5707963267948966192313216916398) - fastAsin(x); //(PI / 2)
+	}
+
+	template<length_t L, typename T, qualifier Q>
+	GLM_FUNC_QUALIFIER vec<L, T, Q> fastAcos(vec<L, T, Q> const& x)
+	{
+		return detail::functor1<vec, L, T, T, Q>::call(fastAcos, x);
+	}
+
+	// atan
+	template<typename T>
+	GLM_FUNC_QUALIFIER T fastAtan(T y, T x)
+	{
+		T sgn = sign(y) * sign(x);
+		return abs(fastAtan(y / x)) * sgn;
+	}
+
+	template<length_t L, typename T, qualifier Q>
+	GLM_FUNC_QUALIFIER vec<L, T, Q> fastAtan(vec<L, T, Q> const& y, vec<L, T, Q> const& x)
+	{
+		return detail::functor2<vec, L, T, Q>::call(fastAtan, y, x);
+	}
+
+	template<typename T>
+	GLM_FUNC_QUALIFIER T fastAtan(T x)
+	{
+		return x - (x * x * x * T(0.333333333333)) + (x * x * x * x * x * T(0.2)) - (x * x * x * x * x * x * x * T(0.1428571429)) + (x * x * x * x * x * x * x * x * x * T(0.111111111111)) - (x * x * x * x * x * x * x * x * x * x * x * T(0.0909090909));
+	}
+
+	template<length_t L, typename T, qualifier Q>
+	GLM_FUNC_QUALIFIER vec<L, T, Q> fastAtan(vec<L, T, Q> const& x)
+	{
+		return detail::functor1<vec, L, T, T, Q>::call(fastAtan, x);
+	}
+}//namespace glm
-- 
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