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
|
/*
Copyright (c) 2019 The Khronos Group Inc.
Use of this source code is governed by an MIT-style license that can be
found in the LICENSE.txt file.
*/
#ifdef GL_ES
precision mediump float;
#endif
varying vec4 color;
float lerp(float a, float b, float s)
{
return a + (b - a) * s;
}
void main (void)
{
float sinValues[17];
sinValues[0] = 0.0;
sinValues[1] = 0.382683;
sinValues[2] = 0.707107;
sinValues[3] = 0.92388;
sinValues[4] = 1.0;
sinValues[5] = 0.92388;
sinValues[6] = 0.707107;
sinValues[7] = 0.382683;
sinValues[8] = 0.0;
sinValues[9] = -0.382683;
sinValues[10] = -0.707107;
sinValues[11] = -0.92388;
sinValues[12] = -1.0;
sinValues[13] = -0.923879;
sinValues[14] = -0.707107;
sinValues[15] = -0.382683;
sinValues[16] = 0.0;
const float M_PI = 3.14159265358979323846;
vec2 c = 2.0 * M_PI * color.rg;
vec2 arrVal = c * 2.546478971;
int arr0x = int(floor(arrVal.x));
int arr0y = int(floor(arrVal.y));
vec2 weight = arrVal - floor(arrVal);
vec2 sin_c = vec2(0.0, 0.0);
if (arr0x == 0)
sin_c.x = lerp(sinValues[0], sinValues[1], weight.x);
else if (arr0x == 1)
sin_c.x = lerp(sinValues[1], sinValues[2], weight.x);
else if (arr0x == 2)
sin_c.x = lerp(sinValues[2], sinValues[3], weight.x);
else if (arr0x == 3)
sin_c.x = lerp(sinValues[3], sinValues[4], weight.x);
else if (arr0x == 4)
sin_c.x = lerp(sinValues[4], sinValues[5], weight.x);
else if (arr0x == 5)
sin_c.x = lerp(sinValues[5], sinValues[6], weight.x);
else if (arr0x == 6)
sin_c.x = lerp(sinValues[6], sinValues[7], weight.x);
else if (arr0x == 7)
sin_c.x = lerp(sinValues[7], sinValues[8], weight.x);
else if (arr0x == 8)
sin_c.x = lerp(sinValues[8], sinValues[9], weight.x);
else if (arr0x == 9)
sin_c.x = lerp(sinValues[9], sinValues[10], weight.x);
else if (arr0x == 10)
sin_c.x = lerp(sinValues[10], sinValues[11], weight.x);
else if (arr0x == 11)
sin_c.x = lerp(sinValues[11], sinValues[12], weight.x);
else if (arr0x == 12)
sin_c.x = lerp(sinValues[12], sinValues[13], weight.x);
else if (arr0x == 13)
sin_c.x = lerp(sinValues[13], sinValues[14], weight.x);
else if (arr0x == 14)
sin_c.x = lerp(sinValues[14], sinValues[15], weight.x);
else if (arr0x == 15)
sin_c.x = lerp(sinValues[15], sinValues[16], weight.x);
else if (arr0x == 16)
sin_c.x = sinValues[16];
if (arr0y == 0)
sin_c.y = lerp(sinValues[0], sinValues[1], weight.y);
else if (arr0y == 1)
sin_c.y = lerp(sinValues[1], sinValues[2], weight.y);
else if (arr0y == 2)
sin_c.y = lerp(sinValues[2], sinValues[3], weight.y);
else if (arr0y == 3)
sin_c.y = lerp(sinValues[3], sinValues[4], weight.y);
else if (arr0y == 4)
sin_c.y = lerp(sinValues[4], sinValues[5], weight.y);
else if (arr0y == 5)
sin_c.y = lerp(sinValues[5], sinValues[6], weight.y);
else if (arr0y == 6)
sin_c.y = lerp(sinValues[6], sinValues[7], weight.y);
else if (arr0y == 7)
sin_c.y = lerp(sinValues[7], sinValues[8], weight.y);
else if (arr0y == 8)
sin_c.y = lerp(sinValues[8], sinValues[9], weight.y);
else if (arr0y == 9)
sin_c.y = lerp(sinValues[9], sinValues[10], weight.y);
else if (arr0y == 10)
sin_c.y = lerp(sinValues[10], sinValues[11], weight.y);
else if (arr0y == 11)
sin_c.y = lerp(sinValues[11], sinValues[12], weight.y);
else if (arr0y == 12)
sin_c.y = lerp(sinValues[12], sinValues[13], weight.y);
else if (arr0y == 13)
sin_c.y = lerp(sinValues[13], sinValues[14], weight.y);
else if (arr0y == 14)
sin_c.y = lerp(sinValues[14], sinValues[15], weight.y);
else if (arr0y == 15)
sin_c.y = lerp(sinValues[15], sinValues[16], weight.y);
else if (arr0y == 16)
sin_c.y = sinValues[16];
gl_FragColor = vec4(0.5 * sin_c + 0.5, 0.0, 1.0);
}
|
