shader for phone

phone.glsl

#ifdef GL_FRAGMENT_PRECISION_HIGH
precision highp float;
#else
precision mediump float;
#endif

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

//const float speed = 5.0;

//const vec3 top = vec3(0.18, 0.81, 0.92);
//const vec3 bottom = vec3(1.094, 0.0, 0.424);
const float widthFactor = 2.0;

vec3 calcSine(vec2 uv, float speed,
              float frequency, float amplitude, float shift, float offset,
              vec3 color, float width, float exponent, bool dir)
{
    float angle = time * speed + 2.0 * frequency * -1.0 + (shift + uv.x) * 2.0;

    float y = sin(angle) * amplitude + offset;
    float clampY = clamp(0.0, y, y) + 13.0;
    float diffY = y * uv.y;

    float dsqr = distance(y, uv.y);
    float scale = 0.0;

    if(dir && diffY > 0.0)
    {
        dsqr = dsqr * 4.0;
    }
    else if(!dir && diffY < 0.0)
    {
        dsqr = dsqr * 4.0;
    }

    scale = pow(smoothstep(width * widthFactor, 0.0, dsqr), exponent);

    return min(color * scale, color);
}

void mainImage( out vec4 fragColor, in vec2 fragCoord )
{
	vec3 top = vec3(0.08, 0.0, 1.0);
	vec3 bottom = vec3(0.50, 0.0, 0.0);
    vec2 uv = fragCoord.yx / resolution.yx;
    vec3 color = vec3(mix(bottom, top, uv.x));

    color += calcSine(uv, 0.2, 0.20, 0.2, 0.0, 0.5,  vec3(1.0, 0.3, 0.3), 0.1, 15.0,false);
    color += calcSine(uv, 0.4, 0.40, 0.5, 0.0, 0.5, vec3(0.3, 0.3, 0.8), 0.1, 17.0,false);
    color += calcSine(uv, 0.3, 0.60, 0.15, 0.0, 0.5, vec3(0.3, 0.3, 1.3), 0.05, 23.0,false);

    color += calcSine(uv, 0.1, 0.26, 0.07, 0.0, 0.3, vec3(0.3, 0.3, 0.3), 0.1, 17.0,true);
    color += calcSine(uv, 0.3, 0.36, 0.0, 0.0, 0.3, vec3(0.3, 0.3, 0.3), 0.1, 17.0,true);
    color += calcSine(uv, 0.5, 0.46, 0.5, 0.0, 0.3, vec3(0.3, 0.3, 0.3), 0.05, 23.0,true);
    color += calcSine(uv, 0.2, 0.58, 0.05, 0.0, 0.3, vec3(0.3, 0.3, 0.3), 0.2, 15.0,true);

    fragColor = vec4(color,1.0);

}


void main() {
  vec4 fragment_color;
  mainImage(fragment_color, gl_FragCoord.xy);
  gl_FragColor = fragment_color;
}