PathTracer/Color.cpp at master · agavinm/PathTracer · 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
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
/******************************************************************************
 * @file    Color.cpp
 * @author  Andrés Gavín Murillo, 716358
 * @author  Abel Naya Forcano, 544125
 * @date    Enero 2020
 * @coms    Informática Gráfica - Trabajo 4: Path tracer
 ******************************************************************************/

#include <algorithm>
#include <cmath>
#include "Color.hpp"

using namespace std;

float Color::max() const {
    return std::max(std::max(this->r, this->g), this->b);
}

Color Color::operator+(const Color &right) const {
    return {
            this->r + right.r,
            this->g + right.g,
            this->b + right.b
    };
}

Color Color::operator*(const Color &right) const {
    return {
            this->r * right.r,
            this->g * right.g,
            this->b * right.b
    };
}

bool Color::operator>(const Color &right) const {
    return this->r + this->g + this->b > right.r + right.g + right.b;
}

Color Color::operator/(float s) const {
    return {
            this->r / s,
            this->g / s,
            this->b / s
    };
}

Color Color::operator*(float s) const {
    return {
            this->r * s,
            this->g * s,
            this->b * s
    };
}

Color rgb(const unsigned char r, const unsigned char g, const unsigned char b) {
    return {(float) r / 255.0f, (float) g / 255.0f, (float) b / 255.0f};
}

VertexColor vertexColor(const Color colors[3], const HCoord vertices[3], const VertexColor::VERTEX_COLOR_TYPE &type) {
    return VertexColor {
            .type = type,
            .colors = {colors[0], colors[1], colors[2]},
            .vertices = {vertices[0], vertices[1], vertices[2]}
    };
}

VertexColor vertexColorNearest(const Color colors[3], const HCoord vertices[3]) {
    return vertexColor(colors, vertices, VertexColor::NEAREST);
}

VertexColor vertexColorDistanceWeighting(const Color colors[3], const HCoord vertices[3]) {
    return vertexColor(colors, vertices, VertexColor::DISTANCE_WEIGHTING);
}

VertexColor vertexColorDistanceWeightingSquare(const Color colors[3], const HCoord vertices[3]) {
    return vertexColor(colors, vertices, VertexColor::DISTANCE_WEIGHTING_SQUARE);
}

Color getColor(const VertexColor &vertexColor, const HCoord &position) {
    float mods[3] = {mod(position - vertexColor.vertices[0]),
                     mod(position - vertexColor.vertices[1]),
                     mod(position - vertexColor.vertices[2])};

    if (mods[0] == 0.0f) return vertexColor.colors[0];
    else if (mods[1] == 0.0f) return vertexColor.colors[1];
    else if (mods[2] == 0.0f) return vertexColor.colors[2];

    switch (vertexColor.type) {
        case VertexColor::NEAREST: {
            if (mods[0] < mods[1] && mods[0] < mods[2]) return vertexColor.colors[0];
            else if (mods[1] < mods[0] && mods[1] < mods[2]) return vertexColor.colors[1];
            else return vertexColor.colors[2];
        }
        case VertexColor::DISTANCE_WEIGHTING: {
            return ((vertexColor.colors[0] / mods[0] + vertexColor.colors[1] / mods[1] + vertexColor.colors[2] / mods[2])
                    / (1.0f / mods[0] + 1.0f / mods[1] + 1.0f / mods[2]));
        }
        case VertexColor::DISTANCE_WEIGHTING_SQUARE: {
            return ((vertexColor.colors[0] / (mods[0] * mods[0]) + vertexColor.colors[1] / (mods[1] * mods[1])
                     + vertexColor.colors[2] / (mods[2] * mods[2]))
                    / (1.0f / (mods[0] * mods[0]) + 1.0f / (mods[1] * mods[1]) + 1.0f / (mods[2] * mods[2])));
        }
        default:
            return C_BLACK;
    }
}

Color hsv(float H, float S, float V) {
    float r = 0, g = 0, b = 0;

    if (S == 0) {
        r = V;
        g = V;
        b = V;
    } else {
        int i;
        float f, p, q, t;

        if (H == 360)
            H = 0;
        else
            H = H / 60;

        i = (int) trunc(H);
        f = H - i;

        p = V * (1.0f - S);
        q = V * (1.0f - (S * f));
        t = V * (1.0f - (S * (1.0f - f)));

        switch (i) {
            case 0:
                r = V;
                g = t;
                b = p;
                break;

            case 1:
                r = q;
                g = V;
                b = p;
                break;

            case 2:
                r = p;
                g = V;
                b = t;
                break;

            case 3:
                r = p;
                g = q;
                b = V;
                break;

            case 4:
                r = t;
                g = p;
                b = V;
                break;

            default:
                r = V;
                g = p;
                b = q;
                break;
        }

    }

    return {r, g, b};
}