snoopy/include/colour.h

#pragma once

#include "error.h"
#include "vec3.h"

// for writing to stdout
#include <iostream>

// for writing to socket
#include <unistd.h>

class colour : public vec3
{
    using vec3::vec3;

public:
    friend colour operator*(const colour& u, const colour& v);
    friend colour lerp(const colour& a, const colour& b, double t);

    colour correct_gamma(int samples);

    friend void write_colour_to_socket(int sockfd, colour pixel_colour, int samples_per_pixel);
    friend void write_colour_to_stream(std::ostream &out, colour pixel_colour, int samples_per_pixel);
    friend int format_component(double component);
};

const colour pink(254.0/255.0, 226.0/255.0, 170.0/255.0);
const colour grey(0.133, 0.133, 0.133);