rtweekend.h

#ifndef RTWEEKEND_H
#define RTWEEKEND_H

#include <cmath>
#include <cstdlib>
#include <limits>
#include <memory>

// Usings

using std::make_shared;
using std::shared_ptr;
using std::sqrt;

// Constants

const double infinity = std::numeric_limits<double>::infinity();
const double pi = 3.1415926535897932385;

// Utility Functions

inline double degrees_to_radians(double degrees)
{
    return degrees * pi / 180.0;
}

inline double random_double()
{
    // Returns a random real in [0,1]
    return rand() / (RAND_MAX + 1.0);
}

inline double random_double(double min, double max)
{
    // Returns a random real in [min,max]
    return min + (max - min) * random_double();
}

inline double clamp(double x, double min, double max)
{
    if (x < min)
        return min;
    if (max < x)
        return max;
    return x;
}

// Common Headers

#include "ray.h"
#include "vec3.h"

#endif