constants.hpp

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#pragma once
#ifndef OGLPLUS_MATH_CONSTANTS_1107121519_HPP
#define OGLPLUS_MATH_CONSTANTS_1107121519_HPP

#include <cmath>

namespace oglplus {
namespace math {

#ifdef M_PI
inline decltype(M_PI) Pi(void)
{
    return M_PI;
}

inline decltype(2*M_PI) TwoPi(void)
{
    return 2*M_PI;
}

inline decltype(0.5*M_PI) HalfPi(void)
{
    return 0.5*M_PI;
}
#else
inline decltype(std::atan(1.0) * 4.0) Pi(void)
{
    static auto _pi = std::atan(1.0) * 4.0;
    return _pi;
}

inline decltype(std::atan(1.0) * 8.0) TwoPi(void)
{
    static auto _pi = std::atan(1.0) * 8.0;
    return _pi;
}

inline decltype(std::atan(1.0) * 2.0) HalfPi(void)
{
    static auto _pi = std::atan(1.0) * 2.0;
    return _pi;
}
#endif

} // namespace math
} // namespace oglplus

#endif // include guard