rtweekend.h

#pragma once

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


// Usings
using std::shared_ptr;
using std::make_shared;
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;
}

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

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

// Clamps values to [min,max]
inline double clamp(double x, double min, double max) {
  if ( x < min ) return min;
  if ( x > max ) return max;
  return x;
}



// Common headers
#include "ray.h"
#include "vec3.h"