shader_type canvas_item;

uniform float r = 0.5;
uniform float visibility = 1.0;

void fragment() 
{
	vec2 uv = UV - 0.5;
	int div = 127;
	vec2 st = (vec2(ivec2( uv * float(div) ))+0.5)/float(div);
	float d = length(st);
	float c = 1.0;
	float alpha = visibility;
	if (d<r){
		c = 0.0;
	}
	else{
		alpha = 0.0;
	}
	
	
	c = smoothstep(r,r,1);
	COLOR = vec4(vec3(c),alpha);
}