toytracer/util.h

#ifndef UTIL_H
#define UTIL_H

#include <limits>
#include <random>
#include <ctime>

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

inline double degrees_to_radians(double degrees) {
    return degrees * pi / 180;
}

inline double random_double() {
    static std::uniform_real_distribution<double> distribution(0.0, 1.0);
    static std::mt19937 generator(std::time(nullptr));
    return distribution(generator);
}

inline double random_double(double min, double max) {
    return min + (max-min) * random_double();
}

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

#endif // UTIL_H