The rings of Uranus

SomeHlsl.fx

#ifdef GL_ES
precision highp float;
#endif

uniform float time;
uniform vec2 resolution;
uniform vec4 mouse;
uniform sampler2D tex0;
uniform sampler2D tex1;

void main(void)
{

    vec2 p = gl_FragCoord.xy / resolution.xy;
    vec2 m = mouse.xy / resolution.xy;

    float a1 = atan(m.y-p.y,p.x-m.x);
    float r1 = sqrt(dot(p-m,p-m));

    vec2 uv;
    uv.x = 0.1*time + (r1-a1)*0.25;
    uv.y = sin(2.0*(a1-r1));

    float w = r1*a1*1.0;
    vec3 col = texture2D(tex0,uv).xyz;

    gl_FragColor = vec4(col/(.1+w),1.0);
}