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
|
/// @ref gtx_color_space
/// @file glm/gtx/color_space.inl
namespace glm
{
template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER vec<3, T, Q> rgbColor(const vec<3, T, Q>& hsvColor)
{
vec<3, T, Q> hsv = hsvColor;
vec<3, T, Q> rgbColor;
if(hsv.y == static_cast<T>(0))
// achromatic (grey)
rgbColor = vec<3, T, Q>(hsv.z);
else
{
T sector = floor(hsv.x * (T(1) / T(60)));
T frac = (hsv.x * (T(1) / T(60))) - sector;
// factorial part of h
T o = hsv.z * (T(1) - hsv.y);
T p = hsv.z * (T(1) - hsv.y * frac);
T q = hsv.z * (T(1) - hsv.y * (T(1) - frac));
switch(int(sector))
{
default:
case 0:
rgbColor.r = hsv.z;
rgbColor.g = q;
rgbColor.b = o;
break;
case 1:
rgbColor.r = p;
rgbColor.g = hsv.z;
rgbColor.b = o;
break;
case 2:
rgbColor.r = o;
rgbColor.g = hsv.z;
rgbColor.b = q;
break;
case 3:
rgbColor.r = o;
rgbColor.g = p;
rgbColor.b = hsv.z;
break;
case 4:
rgbColor.r = q;
rgbColor.g = o;
rgbColor.b = hsv.z;
break;
case 5:
rgbColor.r = hsv.z;
rgbColor.g = o;
rgbColor.b = p;
break;
}
}
return rgbColor;
}
template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER vec<3, T, Q> hsvColor(const vec<3, T, Q>& rgbColor)
{
vec<3, T, Q> hsv = rgbColor;
float Min = min(min(rgbColor.r, rgbColor.g), rgbColor.b);
float Max = max(max(rgbColor.r, rgbColor.g), rgbColor.b);
float Delta = Max - Min;
hsv.z = Max;
if(Max != static_cast<T>(0))
{
hsv.y = Delta / hsv.z;
T h = static_cast<T>(0);
if(rgbColor.r == Max)
// between yellow & magenta
h = static_cast<T>(0) + T(60) * (rgbColor.g - rgbColor.b) / Delta;
else if(rgbColor.g == Max)
// between cyan & yellow
h = static_cast<T>(120) + T(60) * (rgbColor.b - rgbColor.r) / Delta;
else
// between magenta & cyan
h = static_cast<T>(240) + T(60) * (rgbColor.r - rgbColor.g) / Delta;
if(h < T(0))
hsv.x = h + T(360);
else
hsv.x = h;
}
else
{
// If r = g = b = 0 then s = 0, h is undefined
hsv.y = static_cast<T>(0);
hsv.x = static_cast<T>(0);
}
return hsv;
}
template<typename T>
GLM_FUNC_QUALIFIER mat<4, 4, T, defaultp> saturation(T const s)
{
vec<3, T, defaultp> rgbw = vec<3, T, defaultp>(T(0.2126), T(0.7152), T(0.0722));
vec<3, T, defaultp> const col((T(1) - s) * rgbw);
mat<4, 4, T, defaultp> result(T(1));
result[0][0] = col.x + s;
result[0][1] = col.x;
result[0][2] = col.x;
result[1][0] = col.y;
result[1][1] = col.y + s;
result[1][2] = col.y;
result[2][0] = col.z;
result[2][1] = col.z;
result[2][2] = col.z + s;
return result;
}
template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER vec<3, T, Q> saturation(const T s, const vec<3, T, Q>& color)
{
return vec<3, T, Q>(saturation(s) * vec<4, T, Q>(color, T(0)));
}
template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER vec<4, T, Q> saturation(const T s, const vec<4, T, Q>& color)
{
return saturation(s) * color;
}
template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER T luminosity(const vec<3, T, Q>& color)
{
const vec<3, T, Q> tmp = vec<3, T, Q>(0.33, 0.59, 0.11);
return dot(color, tmp);
}
}//namespace glm
|
