127 lines
3.6 KiB
C++
Executable File
127 lines
3.6 KiB
C++
Executable File
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <type_traits>
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#if defined (WIN32)
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#ifdef max
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#undef max
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#endif
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#ifdef min
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#undef min
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#endif
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#ifdef far
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#undef far
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#endif
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#ifdef near
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#undef near
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#endif
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#endif
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// compatibility with non-clang compilers...
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#ifndef __has_attribute
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#define __has_attribute(x) 0
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#endif
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#ifndef __has_builtin
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#define __has_builtin(x) 0
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#endif
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#if __has_builtin(__builtin_expect)
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# ifdef __cplusplus
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# define MATH_LIKELY( exp ) (__builtin_expect( !!(exp), true ))
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# define MATH_UNLIKELY( exp ) (__builtin_expect( !!(exp), false ))
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# else
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# define MATH_LIKELY( exp ) (__builtin_expect( !!(exp), 1 ))
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# define MATH_UNLIKELY( exp ) (__builtin_expect( !!(exp), 0 ))
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# endif
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#else
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# define MATH_LIKELY( exp ) (exp)
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# define MATH_UNLIKELY( exp ) (exp)
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#endif
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#if __has_attribute(unused)
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# define MATH_UNUSED __attribute__((unused))
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#else
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# define MATH_UNUSED
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#endif
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#if __has_attribute(pure)
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# define MATH_PURE __attribute__((pure))
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#else
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# define MATH_PURE
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#endif
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#ifdef _MSC_VER
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# define MATH_EMPTY_BASES __declspec(empty_bases)
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// MSVC does not support loop unrolling hints
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# define MATH_NOUNROLL
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// Sadly, MSVC does not support __builtin_constant_p
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# ifndef MAKE_CONSTEXPR
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# define MAKE_CONSTEXPR(e) (e)
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# endif
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// About value initialization, the C++ standard says:
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// if T is a class type with a default constructor that is neither user-provided nor deleted
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// (that is, it may be a class with an implicitly-defined or defaulted default constructor),
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// the object is zero-initialized and then it is default-initialized
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// if it has a non-trivial default constructor;
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// Unfortunately, MSVC always calls the default constructor, even if it is trivial, which
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// breaks constexpr-ness. To workaround this, we're always zero-initializing TVecN<>
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# define MATH_CONSTEXPR_INIT {}
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# define MATH_DEFAULT_CTOR {}
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# define MATH_DEFAULT_CTOR_CONSTEXPR constexpr
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# define CONSTEXPR_IF_NOT_MSVC // when declared constexpr, msvc fails with "failure was caused by cast of object of dynamic type"
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#else // _MSC_VER
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# define MATH_EMPTY_BASES
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// C++11 allows pragmas to be specified as part of defines using the _Pragma syntax.
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# define MATH_NOUNROLL _Pragma("nounroll")
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# ifndef MAKE_CONSTEXPR
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# define MAKE_CONSTEXPR(e) __builtin_constant_p(e) ? (e) : (e)
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# endif
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# define MATH_CONSTEXPR_INIT
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# define MATH_DEFAULT_CTOR = default;
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# define MATH_DEFAULT_CTOR_CONSTEXPR
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# define CONSTEXPR_IF_NOT_MSVC constexpr
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#endif // _MSC_VER
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namespace filament {
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namespace math {
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// MSVC 2019 16.4 doesn't seem to like it when we specialize std::is_arithmetic for
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// filament::math::half, so we're forced to create our own is_arithmetic here and specialize it
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// inside of half.h.
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template<typename T>
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struct is_arithmetic : std::integral_constant<bool,
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std::is_integral<T>::value || std::is_floating_point<T>::value> {
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};
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}
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}
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