- fragment shader で流体表現
- glslsandbox で作成
- 元はストライプ模様のシェーダー
#ifdef GL_ES
precision mediump float;
#endif
uniform float time;
uniform vec2 mouse;
uniform vec2 resolution;
varying vec2 surfacePosition;
#define stripes 1.
#define k 4.
#define sy surfacePosition.y
#define sx surfacePosition.x
float PI = k*atan(stripes);
vec3 getColor(float phase) {
float x = sx*.1;
float y = sy*.1;
float theta = atan(y, x) ;
float r = log((x*x + y*y));
float c = .0;
float a = .0;
float tt;
for (float t=0.; t<k; t++) {
float tt = t * PI;
c += sin(((k-t)*theta*cos(tt/*+theta*/) + t*r*sin(k-t)) * stripes - phase);
a += sin(((k-t)*theta*cos(tt) + t*r*sin(k-t)) * stripes + phase);
phase*=.5;
}
c*=.2;
a*=.3;
return vec3(abs(c*.1*mouse.x),abs(a*a), -c+.1*mouse.y);
}
void main(void) {
vec3 c = getColor(time*0.1*PI);
gl_FragColor = vec4(c, 1.0);
}
