#ifdef GL_ES
precision highp float;
#endif

uniform float time;
uniform vec2 resolution;
uniform vec4 mouse;

struct rayHit {
   vec3 lv; vec3 rv; vec3 cv; vec3 norm;
};

float getMBv(vec3 ball, vec3 sp) {
   return 1./(pow(ball.x-sp.x, 2.)+pow(ball.y-sp.y, 2.));
}

void main()
{
    vec2 p = -2.0 + 4.0 * gl_FragCoord.xy / resolution;
    p.x *= resolution.x/resolution.y;

    vec3 camera = vec3(p, -1.0);
    vec3 r = camera;
    vec3 col = vec3(0., 0., 0.1);

    vec3 cc = vec3(cos(time), sin(time), 0.);
    vec3 cc2 = cc+vec3(-cos(time*6.), -sin(time*8.), 0.);
    vec3 lightpos = vec3(0.,0., 1.+cos(time)*1.22222);

    bool hit = false;
    float d = distance(camera.xy, cc.xy);
    float d2 = distance(camera.xy, cc2.xy);
    float th = getMBv(cc, camera);
    float th2 = getMBv(cc2, camera);

    rayHit rh;
    if (th+th2 > 3.) {
       hit = true;
        col = vec3(0., 0., 1.);
        d =d/.5;
        d2 =d2/.5;
        r = vec3(p, ((1.-1./th+1.-1./th2)/2.));
    }

    if (hit) {
    vec3 lv = lightpos-r;
    lv = normalize(lv);
    vec3 norm = ((cc-r)+(cc2-r));
    norm = normalize(norm);

    vec3 cv = camera-r;
    cv = normalize(cv);
    vec3 rv = reflect(lv, norm);
    rv = normalize(rv);

    float i = clamp(dot(lv, norm), 0., 1.);
    col += i*vec3(1.,0., 0.);

    i = pow(clamp(dot(cv, rv), 0., 1.), 2.0);
    col += i *vec3(0., 1., 0.);

    }
    gl_FragColor = vec4(col,1.0);
}