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ImathPlatform.h
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34 
35 #ifndef INCLUDED_IMATHPLATFORM_H
36 #define INCLUDED_IMATHPLATFORM_H
37 
38 //----------------------------------------------------------------------------
39 //
40 // ImathPlatform.h
41 //
42 // This file contains functions and constants which aren't
43 // provided by the system libraries, compilers, or includes on
44 // certain platforms.
45 //
46 //----------------------------------------------------------------------------
47 
48 #include <math.h>
49 
50 #ifndef M_PI
51  #define M_PI 3.14159265358979323846
52 #endif
53 
54 #ifndef M_PI_2
55  #define M_PI_2 1.57079632679489661923 // pi/2
56 #endif
57 
58 
59 //-----------------------------------------------------------------------------
60 //
61 // Some, but not all, C++ compilers support the C99 restrict
62 // keyword or some variant of it, for example, __restrict.
63 //
64 //-----------------------------------------------------------------------------
65 
66 #if defined __GNUC__
67 
68  //
69  // supports __restrict
70  //
71 
72  #define IMATH_RESTRICT __restrict
73 
74 #elif defined (__INTEL_COMPILER) || \
75  defined(__ICL) || \
76  defined(__ICC) || \
77  defined(__ECC)
78 
79  //
80  // supports restrict
81  //
82 
83  #define IMATH_RESTRICT restrict
84 
85 #elif defined __sgi
86 
87  //
88  // supports restrict
89  //
90 
91  #define IMATH_RESTRICT restrict
92 
93 #elif defined _MSC_VER
94 
95  //
96  // supports __restrict
97  //
98 
99 // #define IMATH_RESTRICT __restrict
100  #define IMATH_RESTRICT
101 
102 #else
103 
104  //
105  // restrict / __restrict not supported
106  //
107 
108  #define IMATH_RESTRICT
109 
110 #endif
111 
112 #endif // INCLUDED_IMATHPLATFORM_H