#ifdef GL_ES
precision mediump float;
#endif

#extension GL_OES_standard_derivatives : enable

uniform float u_time;
uniform vec2 u_mouse;
uniform vec2 u_resolution;


void main( void ) {
        float dist= 2.7;
	vec2 p = gl_FragCoord.xy / u_resolution.xy * 2. - 1.;
	p.x *= u_resolution.x/u_resolution.y;
	p*=1.5;
	p=(p);
	float a = sin(atan(p.y,p.x))*cos(atan(p.y,p.x))*2.;
	float l = log(length(p))*1.5;
        float c = sin((l+cos(a*1.-sin(a*2.-u_time*5.)+u_time*3.2)+a*2.+u_time*0.5));
	
	 c*=log(abs(l*dist))/1.5;
	//c*=sin(l*dist);
	gl_FragColor = vec4((c),c*c,-c,1.0 );
}