ImathPlatform.h

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//
// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
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// notice, this list of conditions and the following disclaimer.
// *       Redistributions in binary form must reproduce the above
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// in the documentation and/or other materials provided with the
// distribution.
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// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission. 
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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//

#ifndef INCLUDED_IMATHPLATFORM_H
#define INCLUDED_IMATHPLATFORM_H

//----------------------------------------------------------------------------
//
//  ImathPlatform.h
//
//  This file contains functions and constants which aren't 
//  provided by the system libraries, compilers, or includes on 
//  certain platforms.
//
//----------------------------------------------------------------------------

#include <math.h>

#ifndef M_PI
    #define M_PI    3.14159265358979323846
#endif

#ifndef M_PI_2
    #define M_PI_2  1.57079632679489661923 // pi/2
#endif


//-----------------------------------------------------------------------------
//
//    Some, but not all, C++ compilers support the C99 restrict
//    keyword or some variant of it, for example, __restrict.
//
//-----------------------------------------------------------------------------

#if defined __GNUC__

    //
    // supports __restrict
    //

    #define IMATH_RESTRICT __restrict

#elif defined (__INTEL_COMPILER) || \
      defined(__ICL) || \
      defined(__ICC) || \
      defined(__ECC)

    //
    // supports restrict
    //

    #define IMATH_RESTRICT restrict

#elif defined __sgi

    //
    // supports restrict
    //

    #define IMATH_RESTRICT restrict

#elif defined _MSC_VER

    //
    // supports __restrict
    //

//    #define IMATH_RESTRICT __restrict
    #define IMATH_RESTRICT

#else

    //
    // restrict / __restrict not supported
    //

    #define IMATH_RESTRICT

#endif

#endif // INCLUDED_IMATHPLATFORM_H