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#ifdef GL_ES
precision highp float;
#endif

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

void main() {
    vec2 mouse = (u_mouse.xy / u_resolution - .5)  * 2.0;
	vec2 pos = (gl_FragCoord.xy / u_resolution - .5) * 2.0;
	gl_FragColor = vec4(
    	1.0,
       1.0,
        1.0,
        sqrt(pow(pos.x - mouse.x, 2.0) + pow(pos.y - mouse.y, 2.0))
	);
}