2015-05-05 14:19:16 +00:00
|
|
|
// Author @patriciogv - 2015
|
|
|
|
|
// http://patriciogonzalezvivo.com
|
|
|
|
|
|
2015-05-04 15:05:46 +00:00
|
|
|
#ifdef GL_ES
|
|
|
|
|
precision mediump float;
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
#define PI 3.14159265359
|
|
|
|
|
#define TWO_PI 6.28318530718
|
|
|
|
|
|
|
|
|
|
uniform sampler2D u_tex0;
|
|
|
|
|
uniform vec2 u_tex0Resolution;
|
|
|
|
|
|
|
|
|
|
uniform vec2 u_resolution;
|
|
|
|
|
uniform vec2 u_mouse;
|
|
|
|
|
uniform float u_time;
|
|
|
|
|
|
|
|
|
|
// Based on Asalga shader
|
|
|
|
|
// https://www.shadertoy.com/view/4ss3WX
|
|
|
|
|
void main () {
|
|
|
|
|
vec2 st = gl_FragCoord.xy/u_resolution.xy;
|
|
|
|
|
float time = u_time*0.1;
|
|
|
|
|
|
|
|
|
|
// move to the center
|
|
|
|
|
st = st - 0.5;
|
|
|
|
|
|
|
|
|
|
// cartesian to polar coordinates
|
|
|
|
|
float r = length(st);
|
|
|
|
|
float a = atan(st.y, st.x);
|
|
|
|
|
|
|
|
|
|
// Repeat side acoriding to angle
|
|
|
|
|
float sides = 10.;
|
|
|
|
|
float ma = mod(a, TWO_PI/sides);
|
|
|
|
|
ma = abs(ma - PI/sides);
|
|
|
|
|
|
|
|
|
|
// polar to cartesian coordinates
|
|
|
|
|
st = r * vec2(cos(ma), sin(ma));
|
|
|
|
|
st = fract(st+time);
|
|
|
|
|
|
|
|
|
|
vec4 color = vec4(st.x,st.y,0.0,1.0);
|
|
|
|
|
color = texture2D(u_tex0,st);
|
|
|
|
|
|
|
|
|
|
gl_FragColor = color;
|
|
|
|
|
}
|
