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MONKEY (fog): volumetric haze uses the shared fog colour; no haze on sky pixels (Modern)

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
pkuzic
2026-09-25 09:21:00 +01:00
co-authored by Claude Opus 5.5
parent 543222e802
commit f6368472dd
1 changed files with 28 additions and 3 deletions
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crates/benilla-app/src/volumetric_fog.rs
+28 -3
View File
@@ -52,6 +52,11 @@ struct FogView {
sun_strength: Vec4,
// Actual celestial direction and raymarch step count.
direction_steps: Vec4,
// MONKEY (fog): MonkeyFrame fog rows 1-3. Modern (fog3.x > 0) colours the haze with the shared
// fog colour function and keeps sky pixels (depth 0) out of the distance haze.
mf_fog1: Vec4,
mf_fog2: Vec4,
mf_fog3: Vec4,
}
impl Plugin for VolumetricFogPlugin {
@@ -138,6 +143,8 @@ fn update_fog(
clock: Res<WorldTime>,
weather: Res<WeatherState>,
interior: Res<CameraInteriorClaim>,
// MONKEY (fog): the Modern fog rows (Option: absent in unit tests).
monkey: Option<Res<benilla_world::lighting::MonkeyFrame>>,
mut cameras: Query<(Entity, &Camera, &mut Camera3d), With<WorldCamera>>,
suns: Query<(Entity, &DirectionalLight), With<ShadowSun>>,
) {
@@ -161,7 +168,12 @@ fn update_fog(
let sun = lighting.celestial_dir();
let daylight = ((sun.y + 0.02) / 0.15).clamp(0.0, 1.0);
let fog = Vec3::from_array(lighting.fog_color);
// MONKEY (fog): rows 1-3 as packed for the light buffer.
let rows = monkey.as_ref().map_or([[0.0; 4]; 16], |m| m.pack(0.0, 0.0));
commands.entity(entity).insert(FogView {
mf_fog1: Vec4::from_array(rows[1]),
mf_fog2: Vec4::from_array(rows[2]),
mf_fog3: Vec4::from_array(rows[3]),
color_density: fog.extend(
density(
clock.minute_f,
@@ -371,6 +383,7 @@ impl ViewNode for FogNode {
const FOG_SHADER: &str = r#"
#import bevy_render::view::View
#import bevy_pbr::mesh_view_types::Lights
#import benilla::fog_hook
@group(0) @binding(0) var scene: texture_2d<f32>;
#ifdef MULTISAMPLED
@group(0) @binding(1) var depth: texture_depth_multisampled_2d;
@@ -381,7 +394,11 @@ const FOG_SHADER: &str = r#"
@group(0) @binding(3) var<uniform> lights: Lights;
@group(0) @binding(4) var shadows: texture_depth_2d_array;
@group(0) @binding(5) var shadow_sampler: sampler_comparison;
struct Fog { color_density: vec4<f32>, sun_strength: vec4<f32>, direction_steps: vec4<f32> }
struct Fog {
color_density: vec4<f32>, sun_strength: vec4<f32>, direction_steps: vec4<f32>,
// MONKEY (fog): MonkeyFrame fog1..fog3.
mf_fog1: vec4<f32>, mf_fog2: vec4<f32>, mf_fog3: vec4<f32>,
}
@group(0) @binding(6) var<uniform> fog: Fog;
// Integral of smoothstep(10, 30, distance): zero in the first ten yards,
@@ -420,9 +437,17 @@ fn fragment(@builtin(position) pixel: vec4<f32>) -> @location(0) vec4<f32> {
if (distance <= 10.0) { return source; }
let ray = normalize(delta);
let optical_depth = fog.color_density.w * fog_path(distance);
let opacity = 1.0 - exp(-optical_depth);
var opacity = 1.0 - exp(-optical_depth);
var haze_rgb = fog.color_density.rgb;
if (fog_hook::fog_is_modern(fog.mf_fog3)) {
// MONKEY (fog): the sky (depth 0, clamped to 150 yd above) already carries its own
// horizon fog, so it takes no distance haze; the haze colour is the shared fog colour.
if (z <= 0.0) { opacity = 0.0; }
haze_rgb = fog_hook::fog_modern_colour(fog.color_density.rgb, ray, length(delta),
fog.mf_fog1, fog.mf_fog2, fog.mf_fog3);
}
let luma = vec3(0.2126, 0.7152, 0.0722);
var haze = mix(source.rgb, fog.color_density.rgb, opacity);
var haze = mix(source.rgb, haze_rgb, opacity);
// A darker zone colour may change hue, never the pixel's luminance. Add
// neutral headroom proportionally so saturated channels cannot clip dark.
let missing = max(0.0, dot(source.rgb - haze, luma));