shader_type canvas_item;

uniform vec2 uv0;
uniform vec2 uv1;
uniform vec2 uv2;
uniform vec2 uv3;
uniform vec2 uv4;
uniform vec2 uv5;
uniform vec2 uv6;

uniform sampler2D texture2;

uniform float smoothness = 24.0;
void fragment() {
    vec2 p = UV.xy;
    const int num = 7;
    vec2 v[7];
    v[0] = uv0; v[1] = uv1; v[2] = uv2; v[3] = uv3; v[4] = uv4; v[5] = uv5; v[6] = uv6;
    float d = dot(p-v[0],p-v[0]);
    float s = 1.0;
    int j = num-1;
    for( int i=0; i<num; i++)
    {
        vec2 e = v[j] - v[i];
        vec2 w =    p - v[i];
        vec2 b = w - e*clamp( dot(w,e)/dot(e,e), 0.0, 1.0 );
        d = min( d, dot(b,b) );
        j=i;
    }
    d = s*sqrt(d);
    float alpha  = 1.0 - exp(-smoothness*abs(d));
    COLOR = vec4( texture(texture2, UV).rgb*alpha + texture(TEXTURE, UV).rgb*(1.0-alpha), 1.0);
}