69 lines
1.5 KiB
C++
69 lines
1.5 KiB
C++
#pragma once
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#include "setup.hpp"
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#if GLM_COMPILER == GLM_COMPILER_VC12
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# pragma warning(push)
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# pragma warning(disable: 4512) // assignment operator could not be generated
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#endif
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namespace glm{
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namespace detail
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{
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template <typename T>
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union float_t
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{};
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// https://randomascii.wordpress.com/2012/02/25/comparing-floating-point-numbers-2012-edition/
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template <>
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union float_t<float>
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{
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typedef int int_type;
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typedef float float_type;
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GLM_CONSTEXPR float_t(float_type Num = 0.0f) : f(Num) {}
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GLM_CONSTEXPR float_t& operator=(float_t const& x)
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{
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f = x.f;
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return *this;
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}
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// Portable extraction of components.
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GLM_CONSTEXPR bool negative() const { return i < 0; }
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GLM_CONSTEXPR int_type mantissa() const { return i & ((1 << 23) - 1); }
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GLM_CONSTEXPR int_type exponent() const { return (i >> 23) & ((1 << 8) - 1); }
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int_type i;
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float_type f;
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};
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template <>
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union float_t<double>
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{
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typedef detail::int64 int_type;
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typedef double float_type;
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GLM_CONSTEXPR float_t(float_type Num = static_cast<float_type>(0)) : f(Num) {}
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GLM_CONSTEXPR float_t& operator=(float_t const& x)
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{
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f = x.f;
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return *this;
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}
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// Portable extraction of components.
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GLM_CONSTEXPR bool negative() const { return i < 0; }
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GLM_CONSTEXPR int_type mantissa() const { return i & ((int_type(1) << 52) - 1); }
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GLM_CONSTEXPR int_type exponent() const { return (i >> 52) & ((int_type(1) << 11) - 1); }
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int_type i;
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float_type f;
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};
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}//namespace detail
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}//namespace glm
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#if GLM_COMPILER == GLM_COMPILER_VC12
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# pragma warning(pop)
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#endif
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