#ifdef GL_ES
precision mediump float;
#endif

uniform vec2 u_resolution;
uniform float u_time;

void main() {
    vec2 st = gl_FragCoord.xy/u_resolution.xy;
    vec3 sun = vec3(1.0*abs(sin(u_time)), .0, 0.4*abs(cos(u_time)));

    vec3 pct = vec3(st.x);

    vec3 color = sun;
    color *= vec3(step(0.4, st.y));
    if (step(0.4, st.y)<1.0) {
    	color = sun * vec3(smoothstep(0.2, 0.4, st.y));
    	color += vec3(0.3,0.2,0.9);
    }
    gl_FragColor = vec4(color,1.0);
}