shader_type canvas_item;

uniform float percent;

float atan2(in float y, in float x) {
	bool s = (abs(x) > abs(y));
	if (s) {
		return 3.14159/2.0 - atan(x,y);
	} else {
		return atan(y,x);
	}
}

void fragment() {
	float angle = atan2((UV.y - 0.5) , (UV.x - 0.5));
	float alpha = step(percent * 3.14159 * 2.25, angle + 3.14159);
	vec4 color = texture(TEXTURE, UV);
	COLOR = vec4(color.rgb, color.a * alpha);
}