wavy aah line shader with glslViewer

line.glsl

// vim:ft=glsl
uniform float u_time;
uniform vec2 u_resolution;

float line(vec2 p, vec2 a, vec2 b) {
	vec2 a2b = b - a;
	vec2 a2p = p - a;	
	
	float h = clamp(dot(a2p,a2b) / dot(a2b,a2b), 0.0, 1.0);
	vec2 p1 = mix(a, b, h);
	return length(p1 - p);
}

float rand(float n) {
	return fract(sin(n) * 43758.5453123);
}

float noise(float p){
	float fl = floor(p);
	float fc = fract(p);
	return mix(rand(fl), rand(fl + 1.0), fc);
}

void main() {
	vec2 uv = gl_FragCoord.xy / u_resolution.xy;
	vec2 uv2 = gl_FragCoord.xy / u_resolution.xy;

	float speed = 1.0;
	float line_size = 0.005;

	uv.y += sin(uv.x * 10.0 + u_time * speed) * 0.06 * noise(uv.x + u_time);
	uv2.y += cos(uv.x * 10.0 + u_time * speed) * 0.06 * noise(uv.x + u_time);

	float line = line(uv, vec2(0.0, 0.9), vec2(1.0, 0.9));
	float line2 = line(uv2, vec2(0.0, 0.9), vec2(1.0, 0.9));

	float distance_field = length(max(abs(uv) - 1.0, 0.0) / 0.3);
	float glow = 1.0 - distance_field;

	gl_FragColor = mix(vec4(0.0, 0.0, 0.0, 1.0), vec4(1.0, 1.0, 1.0, 1.0) / line * line_size, glow);
	gl_FragColor += vec4(1.0, 1.0, 1.0, 1.0) / line2 * line_size;
}