// trippy

mat2 rot(float a)
{
	float c = cos(a);
	float s = sin(a);
	return mat2(c, s, -s, c);
}
vec3 fx(vec2 uv)
{
    float time = iTime;
	vec2 f = vec2(0.3);
	vec3 c = vec3(1.2,1.0,1.0);
	float light = 0.1;
	
	for (float x = 1.1; x < 10.0; x += 1.0)
	{
		uv *= rot(x*200.0+sin(time*0.1));
		
		f = vec2(cos(cos(time*0.6+x + uv.x * x) - uv.y * dot(vec2(x + uv.y), vec2(sin(x), cos(x)))));
		light += (0.04 / distance(uv, f)) - (0.01 * distance(vec2((cos(time*0.3 + uv.y))), vec2(uv)));
		
		c.y += sin(x+time+abs(uv.y))*0.3;
		if (c.y<0.8)
			c.y = 0.8;
		light-=x*0.001 + c.y*0.001;
		
	}
	c *= light;
	c.x += (sin(time*2.4)*0.1);
    return c;
}

void mainImage( out vec4 fragColor, in vec2 fragCoord )
{
    vec2 uv = (fragCoord.xy - 0.5 * iResolution.xy) / iResolution.y;
    fragColor = vec4(fx(uv),1.0);
}