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DomainWarping1.frag
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DomainWarping1.frag
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// Author @patriciogv - 2015
// http://patriciogonzalezvivo.com
#ifdef GL_ES
precision highp float;
#endif
uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_time;
float random (in vec2 _st) {
return fract(sin(dot(_st.xy,
vec2(12.9898,78.233)))*
43758.5453123);
}
// Based on Morgan McGuire @morgan3d
// https://www.shadertoy.com/view/4dS3Wd
float noise (in vec2 _st) {
vec2 i = floor(_st);
vec2 f = fract(_st);
// Four corners in 2D of a tile
float a = random(i);
float b = random(i + vec2(1.0, 0.0));
float c = random(i + vec2(0.0, 1.0));
float d = random(i + vec2(1.0, 1.0));
vec2 u = f * f * (3.0 - 2.0 * f);
return mix(a, b, u.x) +
(c - a)* u.y * (1.0 - u.x) +
(d - b) * u.x * u.y;
}
#define NUM_OCTAVES 14
float fbm ( in vec2 _st) {
float v = 0.0;
float a = 0.5;
vec2 shift = vec2(91.0);
// Rotate to reduce axial bias
mat2 rot = mat2(cos(0.7), sin(0.7),
-sin(0.7), cos(0.7));
for (int i = 0; i < NUM_OCTAVES; ++i) {
v += a * noise(_st);
_st = rot * _st * 2.0 + shift;
a *= 0.5;
}
return v;
}
void main() {
vec2 st = gl_FragCoord.xy/u_resolution.xy*3.;
//st += st * abs(sin(u_time*0.1)*3.0);
vec3 color = vec3(0.0);
vec2 q = vec2(0.);
q.x = fbm( st );
q.y = fbm( st + vec2(.7));
vec2 r = vec2(0.);
r.x = fbm( st + .7 * q + vec2(1.4, 7.) + abs(u_time));
r.y = fbm( st + .7 * q + vec2(7., 3.5) + abs(u_time));
float f = fbm(st+r);
color = mix(vec3(.7),
vec3(1),
clamp((f*f) * 3.5, 0.0, .7));
color = mix(color,
vec3(1, 0, 0.35),
clamp(length(q), 0.0, .7));
color = mix(color,
vec3(1, 0, 0),
clamp(length(r.x), 0.0, .7));
color /= vec3(st, .7) - 1.;
gl_FragColor = vec4((f*f*f+.7*f*f+.35*f)*color,1.);
}