| 1 | // |
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| 2 | // SPDX-License-Identifier: BSD-3-Clause |
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| 3 | // Copyright Contributors to the OpenEXR Project. |
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| 4 | // |
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| 5 | |
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| 6 | // |
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| 7 | // This file contains functions and constants which aren't |
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| 8 | // provided by the system libraries, compilers, or includes on |
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| 9 | // certain platforms. |
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| 10 | // |
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| 11 | |
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| 12 | #ifndef INCLUDED_IMATHPLATFORM_H |
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| 13 | #define INCLUDED_IMATHPLATFORM_H |
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| 14 | |
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| 15 | /// @cond Doxygen_Suppress |
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| 16 | |
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| 17 | #include <math.h> |
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| 18 | |
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| 19 | #include "ImathNamespace.h" |
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| 20 | |
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| 21 | #ifdef __cplusplus |
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| 22 | |
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| 23 | IMATH_INTERNAL_NAMESPACE_HEADER_ENTER |
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| 24 | |
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| 25 | // |
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| 26 | // Helpful macros for checking which C++ standard we are compiling with. |
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| 27 | // |
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| 28 | #if (__cplusplus >= 202002L) |
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| 29 | # define IMATH_CPLUSPLUS_VERSION 20 |
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| 30 | #elif (__cplusplus >= 201703L) |
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| 31 | # define IMATH_CPLUSPLUS_VERSION 17 |
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| 32 | #elif (__cplusplus >= 201402L) || (defined(_MSC_VER) && _MSC_VER >= 1914) |
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| 33 | # define IMATH_CPLUSPLUS_VERSION 14 |
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| 34 | #elif (__cplusplus >= 201103L) || (defined(_MSC_VER) && _MSC_VER >= 1900) |
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| 35 | # define IMATH_CPLUSPLUS_VERSION 11 |
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| 36 | #else |
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| 37 | # error "This version of Imath is meant to work only with C++11 and above" |
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| 38 | #endif |
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| 39 | |
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| 40 | |
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| 41 | // |
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| 42 | // Constexpr C++14 conditional definition |
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| 43 | // |
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| 44 | #if (IMATH_CPLUSPLUS_VERSION >= 14) |
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| 45 | #define IMATH_CONSTEXPR14 constexpr |
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| 46 | #else |
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| 47 | #define IMATH_CONSTEXPR14 /* can not be constexpr before c++14 */ |
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| 48 | #endif |
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| 49 | |
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| 50 | #endif // __cplusplus |
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| 51 | |
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| 52 | #ifndef M_PI |
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| 53 | # define M_PI 3.14159265358979323846 |
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| 54 | #endif |
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| 55 | |
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| 56 | #ifndef M_PI_2 |
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| 57 | # define M_PI_2 1.57079632679489661923 // pi/2 |
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| 58 | #endif |
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| 59 | |
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| 60 | //----------------------------------------------------------------------------- |
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| 61 | // |
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| 62 | // Some, but not all, C++ compilers support the C99 restrict |
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| 63 | // keyword or some variant of it, for example, __restrict. |
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| 64 | // |
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| 65 | //----------------------------------------------------------------------------- |
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| 66 | |
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| 67 | #if defined(__GNUC__) || defined(__clang__) || defined(_MSC_VER) || defined(__INTEL_COMPILER) |
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| 68 | # define IMATH_RESTRICT __restrict |
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| 69 | #else |
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| 70 | # define IMATH_RESTRICT |
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| 71 | #endif |
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| 72 | |
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| 73 | #ifdef __cplusplus |
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| 74 | |
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| 75 | IMATH_INTERNAL_NAMESPACE_HEADER_EXIT |
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| 76 | |
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| 77 | #endif // __cplusplus |
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| 78 | |
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| 79 | /// @endcond |
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| 80 | |
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| 81 | #endif // INCLUDED_IMATHPLATFORM_H |
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| 82 | |
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