#ifndef COMMON_H

#define COMMON_H

#include <cmath>

#include <cstdlib>

typedef float ColorReal;

typedef double Real;

typedef int Int;

typedef unsigned int UInt;

typedef long long int LongInt;

typedef unsigned long long int ULongInt;

const Real realRrecision = 1e-10;

class Shared {

private:

	int ref_count;

public:

	Shared(): ref_count() { }

	Shared(const Shared&): ref_count() { }

	virtual ~Shared() { };

	inline Shared& operator=(const Shared&) { return *this; }

	inline void reference() { ++ref_count; }

	inline void unreference() { if (--ref_count <= 0) delete this; }

};

class Color {

public:

	typedef ColorReal Channel;

	union {

		struct { Channel channels[4]; };

		struct { Channel r, g, b, a; };

	};

	inline explicit Color(Channel r = 0.0, Channel g = 0.0, Channel b = 0.0, Channel a = 0.0):

		r(r), g(g), b(b), a(a) { }

};

inline int clz(const Int &x)

	{ return x ? __builtin_clz(x) : 32; }

inline int clz(const UInt &x)

	{ return x ? __builtin_clz(x) : 32; }

inline int clz(const LongInt &x)

	{ return x ? __builtin_clzll(x) : 64; }

inline int clz(const ULongInt &x)

	{ return x ? __builtin_clzll(x) : 64; }

inline Real flip_clamp(Real x) {

	x -= floor(0.5*x)*2.0;

	return 1.0 - fabs(1.0 - x);

}

#endif