#import bevy_core_pipeline::fullscreen_vertex_shader::FullscreenVertexOutput

struct VignetteSettings {
    intensity: f32,
    radius: f32,
}

@group(0) @binding(2) var<uniform> settings: VignetteSettings;
@group(0) @binding(0) var screen_texture: texture_2d<f32>;
@group(0) @binding(1) var texture_sampler: sampler;

@fragment
fn fragment(in: FullscreenVertexOutput) -> @location(0) vec4<f32> {
    let color = textureSample(screen_texture, texture_sampler, in.uv);
    let dist = distance(in.uv, vec2<f32>(0.5, 0.5));
    let vignette = smoothstep(settings.radius, settings.radius - 0.35, dist);
    let strength = mix(1.0, vignette, settings.intensity);
    return vec4<f32>(color.rgb * strength, color.a);
}