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/ext/scalar_integer.inl | 243 +++++++++++++++++++++++++++++++++
 1 file changed, 243 insertions(+)
 create mode 100644 src/include/glm/ext/scalar_integer.inl

(limited to 'src/include/glm/ext/scalar_integer.inl')

diff --git a/src/include/glm/ext/scalar_integer.inl b/src/include/glm/ext/scalar_integer.inl
new file mode 100644
index 0000000..0cc286f
--- /dev/null
+++ b/src/include/glm/ext/scalar_integer.inl
@@ -0,0 +1,243 @@
+#include "../integer.hpp"
+
+namespace glm{
+namespace detail
+{
+	template<length_t L, typename T, qualifier Q, bool compute = false>
+	struct compute_ceilShift
+	{
+		GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& v, T)
+		{
+			return v;
+		}
+	};
+
+	template<length_t L, typename T, qualifier Q>
+	struct compute_ceilShift<L, T, Q, true>
+	{
+		GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& v, T Shift)
+		{
+			return v | (v >> Shift);
+		}
+	};
+
+	template<length_t L, typename T, qualifier Q, bool isSigned = true>
+	struct compute_ceilPowerOfTwo
+	{
+		GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& x)
+		{
+			GLM_STATIC_ASSERT(!std::numeric_limits<T>::is_iec559, "'ceilPowerOfTwo' only accept integer scalar or vector inputs");
+
+			vec<L, T, Q> const Sign(sign(x));
+
+			vec<L, T, Q> v(abs(x));
+
+			v = v - static_cast<T>(1);
+			v = v | (v >> static_cast<T>(1));
+			v = v | (v >> static_cast<T>(2));
+			v = v | (v >> static_cast<T>(4));
+			v = compute_ceilShift<L, T, Q, sizeof(T) >= 2>::call(v, 8);
+			v = compute_ceilShift<L, T, Q, sizeof(T) >= 4>::call(v, 16);
+			v = compute_ceilShift<L, T, Q, sizeof(T) >= 8>::call(v, 32);
+			return (v + static_cast<T>(1)) * Sign;
+		}
+	};
+
+	template<length_t L, typename T, qualifier Q>
+	struct compute_ceilPowerOfTwo<L, T, Q, false>
+	{
+		GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& x)
+		{
+			GLM_STATIC_ASSERT(!std::numeric_limits<T>::is_iec559, "'ceilPowerOfTwo' only accept integer scalar or vector inputs");
+
+			vec<L, T, Q> v(x);
+
+			v = v - static_cast<T>(1);
+			v = v | (v >> static_cast<T>(1));
+			v = v | (v >> static_cast<T>(2));
+			v = v | (v >> static_cast<T>(4));
+			v = compute_ceilShift<L, T, Q, sizeof(T) >= 2>::call(v, 8);
+			v = compute_ceilShift<L, T, Q, sizeof(T) >= 4>::call(v, 16);
+			v = compute_ceilShift<L, T, Q, sizeof(T) >= 8>::call(v, 32);
+			return v + static_cast<T>(1);
+		}
+	};
+
+	template<bool is_float, bool is_signed>
+	struct compute_ceilMultiple{};
+
+	template<>
+	struct compute_ceilMultiple<true, true>
+	{
+		template<typename genType>
+		GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
+		{
+			if(Source > genType(0))
+				return Source + (Multiple - std::fmod(Source, Multiple));
+			else
+				return Source + std::fmod(-Source, Multiple);
+		}
+	};
+
+	template<>
+	struct compute_ceilMultiple<false, false>
+	{
+		template<typename genType>
+		GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
+		{
+			genType Tmp = Source - genType(1);
+			return Tmp + (Multiple - (Tmp % Multiple));
+		}
+	};
+
+	template<>
+	struct compute_ceilMultiple<false, true>
+	{
+		template<typename genType>
+		GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
+		{
+			assert(Multiple > genType(0));
+			if(Source > genType(0))
+			{
+				genType Tmp = Source - genType(1);
+				return Tmp + (Multiple - (Tmp % Multiple));
+			}
+			else
+				return Source + (-Source % Multiple);
+		}
+	};
+
+	template<bool is_float, bool is_signed>
+	struct compute_floorMultiple{};
+
+	template<>
+	struct compute_floorMultiple<true, true>
+	{
+		template<typename genType>
+		GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
+		{
+			if(Source >= genType(0))
+				return Source - std::fmod(Source, Multiple);
+			else
+				return Source - std::fmod(Source, Multiple) - Multiple;
+		}
+	};
+
+	template<>
+	struct compute_floorMultiple<false, false>
+	{
+		template<typename genType>
+		GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
+		{
+			if(Source >= genType(0))
+				return Source - Source % Multiple;
+			else
+			{
+				genType Tmp = Source + genType(1);
+				return Tmp - Tmp % Multiple - Multiple;
+			}
+		}
+	};
+
+	template<>
+	struct compute_floorMultiple<false, true>
+	{
+		template<typename genType>
+		GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
+		{
+			if(Source >= genType(0))
+				return Source - Source % Multiple;
+			else
+			{
+				genType Tmp = Source + genType(1);
+				return Tmp - Tmp % Multiple - Multiple;
+			}
+		}
+	};
+}//namespace detail
+
+	template<typename genIUType>
+	GLM_FUNC_QUALIFIER bool isPowerOfTwo(genIUType Value)
+	{
+		GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'isPowerOfTwo' only accept integer inputs");
+
+		genIUType const Result = glm::abs(Value);
+		return !(Result & (Result - 1));
+	}
+
+	template<typename genIUType>
+	GLM_FUNC_QUALIFIER genIUType nextPowerOfTwo(genIUType value)
+	{
+		GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'nextPowerOfTwo' only accept integer inputs");
+
+		return detail::compute_ceilPowerOfTwo<1, genIUType, defaultp, std::numeric_limits<genIUType>::is_signed>::call(vec<1, genIUType, defaultp>(value)).x;
+	}
+
+	template<typename genIUType>
+	GLM_FUNC_QUALIFIER genIUType prevPowerOfTwo(genIUType value)
+	{
+		GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'prevPowerOfTwo' only accept integer inputs");
+
+		return isPowerOfTwo(value) ? value : static_cast<genIUType>(static_cast<genIUType>(1) << static_cast<genIUType>(findMSB(value)));
+	}
+
+	template<typename genIUType>
+	GLM_FUNC_QUALIFIER bool isMultiple(genIUType Value, genIUType Multiple)
+	{
+		GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'isMultiple' only accept integer inputs");
+
+		return isMultiple(vec<1, genIUType>(Value), vec<1, genIUType>(Multiple)).x;
+	}
+
+	template<typename genIUType>
+	GLM_FUNC_QUALIFIER genIUType nextMultiple(genIUType Source, genIUType Multiple)
+	{
+		GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'nextMultiple' only accept integer inputs");
+
+		return detail::compute_ceilMultiple<std::numeric_limits<genIUType>::is_iec559, std::numeric_limits<genIUType>::is_signed>::call(Source, Multiple);
+	}
+
+	template<typename genIUType>
+	GLM_FUNC_QUALIFIER genIUType prevMultiple(genIUType Source, genIUType Multiple)
+	{
+		GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'prevMultiple' only accept integer inputs");
+
+		return detail::compute_floorMultiple<std::numeric_limits<genIUType>::is_iec559, std::numeric_limits<genIUType>::is_signed>::call(Source, Multiple);
+	}
+
+	template<typename genIUType>
+	GLM_FUNC_QUALIFIER int findNSB(genIUType x, int significantBitCount)
+	{
+		GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'findNSB' only accept integer inputs");
+
+		if(bitCount(x) < significantBitCount)
+			return -1;
+
+		genIUType const One = static_cast<genIUType>(1);
+		int bitPos = 0;
+
+		genIUType key = x;
+		int nBitCount = significantBitCount;
+		int Step = sizeof(x) * 8 / 2;
+		while (key > One)
+		{
+			genIUType Mask = static_cast<genIUType>((One << Step) - One);
+			genIUType currentKey = key & Mask;
+			int currentBitCount = bitCount(currentKey);
+			if (nBitCount > currentBitCount)
+			{
+				nBitCount -= currentBitCount;
+				bitPos += Step;
+				key >>= static_cast<genIUType>(Step);
+			}
+			else
+			{
+				key = key & Mask;
+			}
+
+			Step >>= 1;
+		}
+
+		return static_cast<int>(bitPos);
+	}
+}//namespace glm
-- 
cgit v1.2.3-18-g5258