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VulkanExample / dep / include / glm / gtx / color_space.inl
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1/// @ref gtx_color_space
2
3#include "../ext/scalar_relational.hpp"
4#include "../ext/scalar_constants.hpp"
5
6namespace glm
7{
8 template<typename T, qualifier Q>
9 GLM_FUNC_QUALIFIER vec<3, T, Q> rgbColor(const vec<3, T, Q>& hsvColor)
10 {
11 vec<3, T, Q> hsv = hsvColor;
12 vec<3, T, Q> rgbColor;
13
14 if(equal(hsv.y, static_cast<T>(0), epsilon<T>()))
15 // achromatic (grey)
16 rgbColor = vec<3, T, Q>(hsv.z);
17 else
18 {
19 T sector = floor(hsv.x * (T(1) / T(60)));
20 T frac = (hsv.x * (T(1) / T(60))) - sector;
21 // factorial part of h
22 T o = hsv.z * (T(1) - hsv.y);
23 T p = hsv.z * (T(1) - hsv.y * frac);
24 T q = hsv.z * (T(1) - hsv.y * (T(1) - frac));
25
26 switch(int(sector))
27 {
28 default:
29 case 0:
30 rgbColor.r = hsv.z;
31 rgbColor.g = q;
32 rgbColor.b = o;
33 break;
34 case 1:
35 rgbColor.r = p;
36 rgbColor.g = hsv.z;
37 rgbColor.b = o;
38 break;
39 case 2:
40 rgbColor.r = o;
41 rgbColor.g = hsv.z;
42 rgbColor.b = q;
43 break;
44 case 3:
45 rgbColor.r = o;
46 rgbColor.g = p;
47 rgbColor.b = hsv.z;
48 break;
49 case 4:
50 rgbColor.r = q;
51 rgbColor.g = o;
52 rgbColor.b = hsv.z;
53 break;
54 case 5:
55 rgbColor.r = hsv.z;
56 rgbColor.g = o;
57 rgbColor.b = p;
58 break;
59 }
60 }
61
62 return rgbColor;
63 }
64
65 template<typename T, qualifier Q>
66 GLM_FUNC_QUALIFIER vec<3, T, Q> hsvColor(const vec<3, T, Q>& rgbColor)
67 {
68 vec<3, T, Q> hsv = rgbColor;
69 T Min = min(min(rgbColor.r, rgbColor.g), rgbColor.b);
70 T Max = max(max(rgbColor.r, rgbColor.g), rgbColor.b);
71 T Delta = Max - Min;
72
73 hsv.z = Max;
74
75 if(!equal(Max, static_cast<T>(0), epsilon<T>()))
76 {
77 hsv.y = Delta / hsv.z;
78 T h = static_cast<T>(0);
79
80 if(equal(rgbColor.r, Max, epsilon<T>()))
81 // between yellow & magenta
82 h = static_cast<T>(0) + T(60) * (rgbColor.g - rgbColor.b) / Delta;
83 else if(equal(rgbColor.g, Max, epsilon<T>()))
84 // between cyan & yellow
85 h = static_cast<T>(120) + T(60) * (rgbColor.b - rgbColor.r) / Delta;
86 else
87 // between magenta & cyan
88 h = static_cast<T>(240) + T(60) * (rgbColor.r - rgbColor.g) / Delta;
89
90 if(h < T(0))
91 hsv.x = h + T(360);
92 else
93 hsv.x = h;
94 }
95 else
96 {
97 // If r = g = b = 0 then s = 0, h is undefined
98 hsv.y = static_cast<T>(0);
99 hsv.x = static_cast<T>(0);
100 }
101
102 return hsv;
103 }
104
105 template<typename T>
106 GLM_FUNC_QUALIFIER mat<4, 4, T, defaultp> saturation(T const s)
107 {
108 vec<3, T, defaultp> rgbw = vec<3, T, defaultp>(T(0.2126), T(0.7152), T(0.0722));
109
110 vec<3, T, defaultp> const col((T(1) - s) * rgbw);
111
112 mat<4, 4, T, defaultp> result(T(1));
113 result[0][0] = col.x + s;
114 result[0][1] = col.x;
115 result[0][2] = col.x;
116 result[1][0] = col.y;
117 result[1][1] = col.y + s;
118 result[1][2] = col.y;
119 result[2][0] = col.z;
120 result[2][1] = col.z;
121 result[2][2] = col.z + s;
122
123 return result;
124 }
125
126 template<typename T, qualifier Q>
127 GLM_FUNC_QUALIFIER vec<3, T, Q> saturation(const T s, const vec<3, T, Q>& color)
128 {
129 return vec<3, T, Q>(saturation(s) * vec<4, T, Q>(color, T(0)));
130 }
131
132 template<typename T, qualifier Q>
133 GLM_FUNC_QUALIFIER vec<4, T, Q> saturation(const T s, const vec<4, T, Q>& color)
134 {
135 return saturation(s) * color;
136 }
137
138 template<typename T, qualifier Q>
139 GLM_FUNC_QUALIFIER T luminosity(const vec<3, T, Q>& color)
140 {
141 const vec<3, T, Q> tmp = vec<3, T, Q>(0.33, 0.59, 0.11);
142 return dot(color, tmp);
143 }
144}//namespace glm