shader_type spatial;
render_mode unshaded;

uniform vec4 albedo : hint_color;
uniform float percent;
const float PI = 3.14159;

vec3 circle(vec2 p) {
	float v = (1.0-smoothstep(0.49, 0.50, length(p))) * smoothstep(0.19, 0.2, length(p));
	return vec3(v, v,v);
}

float atan2(in float y, in float x) {
	bool s = (abs(x) > abs(y));
	if (s) {
		return PI/2.0 - atan(x,y);
	} else {
		return atan(y,x);
	}
}

float wipe(vec2 pos, float p_percent) {
	float angle = atan2(pos.y , pos.x);
	float alpha = step(p_percent *PI * 2.25, angle + PI);
	return alpha;
}

void fragment() {
	vec2 base_uv = UV;
	vec2 pos = UV  - vec2(0.5, 0.5);
	ALBEDO = circle(pos) * albedo.xyz;
	ALPHA = circle(pos).x * wipe(pos, percent);
}