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#import bevy_core_pipeline::fullscreen_vertex_shader::FullscreenVertexOutput;
struct OutlinePostProcessSettings {
weight: f32,
threshold: f32,
adaptive: u32,
}
@group(0) @binding(0) var screen_texture: texture_2d<f32>;
@group(0) @binding(1) var screen_sampler: sampler;
@group(0) @binding(2) var normal_texture: texture_2d<f32>;
@group(0) @binding(3) var normal_sampler: sampler;
@group(0) @binding(4) var<uniform> settings: OutlinePostProcessSettings;
@fragment
fn fragment(
in: FullscreenVertexOutput
) -> @location(0) vec4<f32> {
let screen_color = textureSample(screen_texture, screen_sampler, in.uv);
let outline_width = settings.weight / vec2f(textureDimensions(screen_texture));
let uv_top = vec2f(in.uv.x, in.uv.y - outline_width.y);
let uv_right = vec2f(in.uv.x + outline_width.x, in.uv.y);
let uv_top_right = vec2f(in.uv.x + outline_width.x, in.uv.y - outline_width.y);
let normal = textureSample(normal_texture, normal_sampler, in.uv);
let normal_top = textureSample(normal_texture, normal_sampler, uv_top);
let normal_right = textureSample(normal_texture, normal_sampler, uv_right);
let normal_top_right = textureSample(normal_texture, normal_sampler, uv_top_right);
let delta_top = abs(normal - normal_top);
let delta_right = abs(normal - normal_right);
let delta_top_right = abs(normal - normal_top_right);
let delta_max = max(delta_top, max(delta_right, delta_top_right));
let delta_raw = max(delta_max.x, max(delta_max.y, delta_max.z));
// let delta_clipped = clamp((delta_raw * 2.0) - settings.threshold, 0.0, 1.0);
let show_outline = f32(delta_raw > settings.threshold);
var outline = vec4f(show_outline, show_outline, show_outline, 0.0);
let luma = (0.2126 * screen_color.r + 0.7152 * screen_color.g + 0.0722 * screen_color.b);
if settings.adaptive != 0 && luma < 0.5 {
outline = outline * -1;
}
return screen_color - outline;
}
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