mat2 rotate(float Angle){
    mat2 rotation = mat2(
        vec2( cos(Angle),  sin(Angle)),
        vec2(-sin(Angle),  cos(Angle))
    );
	return rotation;
}

vec4 add (vec4 a, vec4 b){
 	return a + b;
}
vec4 sub (vec4 a, vec4 b){
 	return a - b;
}
vec4 mul (vec4 a, vec4 b){
 	return (.5+a) * (.5+b);
}
vec4 div (vec4 a, vec4 b){
 	return a / b;
}
vec4 avg (vec4 a, vec4 b){
 	return (a / b)/2.;
}

void mainImage( out vec4 fragColor, in vec2 fragCoord )
{
	vec2 uv = fragCoord.xy / iResolution.xy - vec2(0.5);
    vec2 yv = uv * (0.99 - 0.04*length(uv));
    yv *= rotate(0.01 + length(uv)*0.09);
    uv+=vec2(0.5);
    yv+=vec2(0.5);
    fragColor = div(mul(texture(iChannel0,uv) * 0.4,texture(iChannel1,yv)*(0.8+sin(iTime*0.01)*0.1)),vec4(.8)); // * (0.85 + 0.1 * sin(iTime + uv.x));
	fragColor.xz *= rotate(0.09*sin(iTime*.4));
    fragColor.yx *= rotate(-0.09*sin(iTime*.7+0.2));
//    fragColor = max(texture(iChannel0,uv)-vec4(0.4),vec4(0.0)) * 1.0 + texture(iChannel1,yv) * (0.85 + 0.1 * sin(iTime + uv.x));
}