precision mediump float;
uniform vec2      resolution;
uniform float     time;

float size = 0.002;

void main( void ) {
    vec2 view = ( gl_FragCoord.xy - resolution / 2.0 ) / ( resolution.y / 2.0);
    float time = time + length(view)*8.;
    vec4 color = vec4(0);
    vec2 center = vec2(0);
    float rotationVelocity = 2.0;
    for( int j = 0; j < 20; j++ ) {
        for( int i = 0; i < 20; i++ ) {
            float amplitude = ( cos( time / 10.0 ) + sin(  time /5.0 ) ) / 2.0;
            float angle =   sin( float(j) * time) * rotationVelocity + 2.0 * 3.14 * float(i) / 20.0;
            center.x = cos( 7.0 * float(j) / 20.0 * 2.0 * 3.14 ) + sin( time / 4.0);
            center.y = sin( 3.0 * float(j) / 20.0 * 2.0 *  3.14 )+ cos( time / 8.0);
            vec2 light = center + amplitude * vec2( cos( angle ), sin( angle ));
            //size = sin( time ) * 0.005;
            float l = size / length( view - light );
            vec4 c = vec4( l / 20.0, l, l, 1.0 ) / 5.0;
            color += c;
        }
    }
    gl_FragColor = color;
}