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
|
#version 100
precision mediump float;
// Input vertex attributes (from vertex shader)
varying vec2 fragTexCoord;
varying vec4 fragColor;
// Custom variables
const float PI = 3.14159265358979323846;
uniform float uTime;
float divisions = 5.0;
float angle = 0.0;
vec2 VectorRotateTime(vec2 v, float speed)
{
float time = uTime*speed;
float localTime = fract(time); // The time domain this works on is 1 sec.
if ((localTime >= 0.0) && (localTime < 0.25)) angle = 0.0;
else if ((localTime >= 0.25) && (localTime < 0.50)) angle = PI/4.0*sin(2.0*PI*localTime - PI/2.0);
else if ((localTime >= 0.50) && (localTime < 0.75)) angle = PI*0.25;
else if ((localTime >= 0.75) && (localTime < 1.00)) angle = PI/4.0*sin(2.0*PI*localTime);
// Rotate vector by angle
v -= 0.5;
v = mat2(cos(angle), -sin(angle), sin(angle), cos(angle))*v;
v += 0.5;
return v;
}
float Rectangle(in vec2 st, in float size, in float fill)
{
float roundSize = 0.5 - size/2.0;
float left = step(roundSize, st.x);
float top = step(roundSize, st.y);
float bottom = step(roundSize, 1.0 - st.y);
float right = step(roundSize, 1.0 - st.x);
return (left*bottom*right*top)*fill;
}
void main()
{
vec2 fragPos = fragTexCoord;
fragPos.xy += uTime/9.0;
fragPos *= divisions;
vec2 ipos = floor(fragPos); // Get the integer coords
vec2 fpos = fract(fragPos); // Get the fractional coords
fpos = VectorRotateTime(fpos, 0.2);
float alpha = Rectangle(fpos, 0.216, 1.0);
vec3 color = vec3(0.3, 0.3, 0.3);
gl_FragColor = vec4(color, alpha);
}
|
