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
|
/*
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.
*/
/* The following files are direct copies of each other:
*
* GL/acos/acos_vec2_frag_xvary_ref.frag
* GL/asin/asin_vec2_frag_xvary_ref.frag
*
* Care should be taken to apply any changes to both. Only the last
* line where gl_FragColor is assigned should be different.
*/
#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 asinValues[17];
asinValues[0] = -1.5708;
asinValues[1] = -1.06544;
asinValues[2] = -0.848062;
asinValues[3] = -0.675132;
asinValues[4] = -0.523599;
asinValues[5] = -0.384397;
asinValues[6] = -0.25268;
asinValues[7] = -0.125328;
asinValues[8] = 0.0;
asinValues[9] = 0.125328;
asinValues[10] = 0.25268;
asinValues[11] = 0.384397;
asinValues[12] = 0.523599;
asinValues[13] = 0.675132;
asinValues[14] = 0.848062;
asinValues[15] = 1.06544;
asinValues[16] = 1.5708;
const float M_PI = 3.14159265358979323846;
vec2 c = 2.0 * (color.rg - 0.5);
vec2 arrVal = (c + vec2(1.0, 1.0)) * 8.0;
int arr0x = int(floor(arrVal.x));
int arr0y = int(floor(arrVal.y));
vec2 weight = arrVal - floor(arrVal);
vec2 asin_c = vec2(0.0);
if (arr0x == 0)
asin_c.x = lerp(asinValues[0], asinValues[1], weight.x);
else if (arr0x == 1)
asin_c.x = lerp(asinValues[1], asinValues[2], weight.x);
else if (arr0x == 2)
asin_c.x = lerp(asinValues[2], asinValues[3], weight.x);
else if (arr0x == 3)
asin_c.x = lerp(asinValues[3], asinValues[4], weight.x);
else if (arr0x == 4)
asin_c.x = lerp(asinValues[4], asinValues[5], weight.x);
else if (arr0x == 5)
asin_c.x = lerp(asinValues[5], asinValues[6], weight.x);
else if (arr0x == 6)
asin_c.x = lerp(asinValues[6], asinValues[7], weight.x);
else if (arr0x == 7)
asin_c.x = lerp(asinValues[7], asinValues[8], weight.x);
else if (arr0x == 8)
asin_c.x = lerp(asinValues[8], asinValues[9], weight.x);
else if (arr0x == 9)
asin_c.x = lerp(asinValues[9], asinValues[10], weight.x);
else if (arr0x == 10)
asin_c.x = lerp(asinValues[10], asinValues[11], weight.x);
else if (arr0x == 11)
asin_c.x = lerp(asinValues[11], asinValues[12], weight.x);
else if (arr0x == 12)
asin_c.x = lerp(asinValues[12], asinValues[13], weight.x);
else if (arr0x == 13)
asin_c.x = lerp(asinValues[13], asinValues[14], weight.x);
else if (arr0x == 14)
asin_c.x = lerp(asinValues[14], asinValues[15], weight.x);
else if (arr0x == 15)
asin_c.x = lerp(asinValues[15], asinValues[16], weight.x);
else if (arr0x == 16)
asin_c.x = asinValues[16];
if (arr0y == 0)
asin_c.y = lerp(asinValues[0], asinValues[1], weight.y);
else if (arr0y == 1)
asin_c.y = lerp(asinValues[1], asinValues[2], weight.y);
else if (arr0y == 2)
asin_c.y = lerp(asinValues[2], asinValues[3], weight.y);
else if (arr0y == 3)
asin_c.y = lerp(asinValues[3], asinValues[4], weight.y);
else if (arr0y == 4)
asin_c.y = lerp(asinValues[4], asinValues[5], weight.y);
else if (arr0y == 5)
asin_c.y = lerp(asinValues[5], asinValues[6], weight.y);
else if (arr0y == 6)
asin_c.y = lerp(asinValues[6], asinValues[7], weight.y);
else if (arr0y == 7)
asin_c.y = lerp(asinValues[7], asinValues[8], weight.y);
else if (arr0y == 8)
asin_c.y = lerp(asinValues[8], asinValues[9], weight.y);
else if (arr0y == 9)
asin_c.y = lerp(asinValues[9], asinValues[10], weight.y);
else if (arr0y == 10)
asin_c.y = lerp(asinValues[10], asinValues[11], weight.y);
else if (arr0y == 11)
asin_c.y = lerp(asinValues[11], asinValues[12], weight.y);
else if (arr0y == 12)
asin_c.y = lerp(asinValues[12], asinValues[13], weight.y);
else if (arr0y == 13)
asin_c.y = lerp(asinValues[13], asinValues[14], weight.y);
else if (arr0y == 14)
asin_c.y = lerp(asinValues[14], asinValues[15], weight.y);
else if (arr0y == 15)
asin_c.y = lerp(asinValues[15], asinValues[16], weight.y);
else if (arr0y == 16)
asin_c.y = asinValues[16];
gl_FragColor = vec4(asin_c / M_PI + 0.5, 0.0, 1.0);
}
|
