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#ifndef MATH_H
#define MATH_H
// Causes MSVC to define M_PI and friends.
// http://msdn.microsoft.com/en-us/library/4hwaceh6.aspx
#define _USE_MATH_DEFINES
#include <cmath>
#include <algorithm>
// If we don't do this then we get the C90 fabs from the global namespace which
// is only defined for double.
using std::fabs;
#define math_max std::max
#define math_min std::min
#define math_max3(a, b, c) math_max(math_max((a), (b)), (c))
template <typename T>
inline T math_clamp(const T& value, const T& min, const T& max) {
if (value > max) {
return max;
}
if (value < min) {
return min;
}
return value;
}
// NOTE(rryan): It is an error to call even() on a floating point number. Do not
// hack this to support floating point values! The programmer should be required
// to manually convert so they are aware of the conversion.
template <typename T>
inline bool even(const T& value) {
return value % 2 == 0;
}
#ifdef _MSC_VER
// VC++ uses _isnan() instead of isnan() and !_finite instead of isinf.
#include <float.h>
#define isnan(x) _isnan(x)
#define isinf(x) (!_finite(x))
#else
// for isnan() and isinf() everywhere else use the cmath version. We define
// these as macros to prevent clashing with c++11 built-ins in the global
// namespace. If you say "using std::isnan;" then this will fail to build with
// std=c++11. See https://bugs.webkit.org/show_bug.cgi?id=59249 for some
// relevant discussion.
#define isnan std::isnan
#define isinf std::isinf
#endif
inline int roundUpToPowerOf2(int v) {
// From http://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2
v--;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
v++;
return v;
}
#endif /* MATH_H */
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