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
|
#version 150
uniform vec2 winsize;
uniform float time;
out vec4 fragColor;
float displacement(vec3 p)
{
float cosT = cos(time);
float sinT = sin(time);
mat2 mat = mat2(cosT, -sinT, sinT, cosT);
p.xz *= mat;
p.xy *= mat;
vec3 q = 1.75 * p;
return length(p + vec3(sinT)) *
log(length(p) + 1.0) +
sin(q.x + sin(q.z + sin(q.y))) * 0.25 - 1.0;
}
void main()
{
vec3 color;
float d = 2.5;
vec2 screenPos = gl_FragCoord.xy / winsize.xy - vec2(0.6, 0.4);
vec3 pos = normalize(vec3(screenPos, -1.0));
float sinT = sin(time) * 0.2;
// compute plasma color
for (int i = 0; i < 8; ++i) {
vec3 p = vec3(0.0, 0.0, 5.0) + pos * d;
float positionFactor = displacement(p);
d += min(positionFactor, 1.0);
float clampFactor = clamp((positionFactor- displacement(p + 0.1)) * 0.5, -0.1, 1.0);
vec3 l = vec3(0.2 * sinT, 0.35, 0.4) + vec3(5.0, 2.5, 3.25) * clampFactor;
color = (color + (1.0 - smoothstep(0.0, 2.5, positionFactor)) * 0.7) * l;
}
// background color + plasma color
fragColor = vec4(screenPos * (vec2(1.0, 0.5) + sinT), 0.5 + sinT, 1.0) + vec4(color, 1.0);
}
|
