#import bevy_pbr::{
    forward_io::VertexOutput,
    mesh_view_bindings::view,
}

struct OutlineMaterial {
    color: vec4<f32>,
    rim_power: f32,
    rim_mix: f32,
    pass_kind: u32,
}

@group(#{MATERIAL_BIND_GROUP}) @binding(0)
var<uniform> material: OutlineMaterial;

@fragment
fn fragment(in: VertexOutput) -> @location(0) vec4<f32> {
    let world_normal = normalize(in.world_normal);
    let view_dir = normalize(view.world_position.xyz - in.world_position.xyz);
    let fresnel = pow(1.0 - saturate(dot(world_normal, view_dir)), material.rim_power);

    var alpha = fresnel * material.rim_mix;
    if material.pass_kind == 1u {
        alpha *= 0.8;
    }

    return vec4(material.color.rgb, material.color.a * saturate(alpha));
}