Learn-RayTracingInOneWeek/color.h at master · Kong25/Learn-RayTracingInOneWeek · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
#ifndef COLOR_H
#define COLOR_H

#include "vec3.h"

#include <iostream>

//void write_color(std::ostream &out, color pixel_color, int samples_per_pixel) {
//    auto r = pixel_color.x();
//    auto g = pixel_color.y();
//    auto b = pixel_color.z();
//
//    // Divide the color by the number of samples.
//    auto scale = 1.0 / samples_per_pixel;
//    r *= scale;
//    g *= scale;
//    b *= scale;
//
//    // Write the translated [0,255] value of each color component.
//    out << static_cast<int>(256 * clamp(r, 0.0, 0.999)) << ' '
//        << static_cast<int>(256 * clamp(g, 0.0, 0.999)) << ' '
//        << static_cast<int>(256 * clamp(b, 0.0, 0.999)) << '\n';
//}

// ´øgammaÐ£Õý
void write_color(std::ostream &out, color pixel_color, int samples_per_pixel) {
    auto r = pixel_color.x();
    auto g = pixel_color.y();
    auto b = pixel_color.z();

    // Divide the color by the number of samples and gamma-correct for gamma=2.0.
    auto scale = 1.0 / samples_per_pixel;
    r = sqrt(scale * r);
    g = sqrt(scale * g);
    b = sqrt(scale * b);

    // Write the translated [0,255] value of each color component.
    out << static_cast<int>(256 * clamp(r, 0.0, 0.999)) << ' '
        << static_cast<int>(256 * clamp(g, 0.0, 0.999)) << ' '
        << static_cast<int>(256 * clamp(b, 0.0, 0.999)) << '\n';
}

#endif