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Tweak fog light falloff & density

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This commit is contained in:
Lauri Räsänen 2023-11-10 01:50:30 +02:00
parent 1c0b9aa63f
commit 7b752703ea
4 changed files with 22 additions and 15 deletions
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2
res/shaders/constants.wgsl
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@ -8,6 +8,6 @@ const INV_SHADOW_SAMPLES = 1.0 / 25.0;
const FOG_MAX_STEPS = 20;
const FOG_MAX_DIST = 300.0;
const FOG_SCALE = 0.01;
const FOG_DENSITY = 1.0;
const FOG_DENSITY = 2.0;
const FOG_ALPHA = 1.0;
const FOG_BLEND_DIST = 10.0;

22
res/shaders/fog.wgsl
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@ -63,7 +63,7 @@ var s_roughness_metalness: sampler;
fn fog_noise(pos: vec3<f32>) -> f32 {
var p = pos * FOG_SCALE;
p.x += global_uniforms.time * 0.01;
p.y += global_uniforms.time * 0.1;
p.y += global_uniforms.time * 0.2;
p.z += sin(global_uniforms.time * 0.1) * 0.1;
return fbm(p);
}
@ -112,12 +112,12 @@ fn fs_main(vert: FogVertexOutput) -> @location(0) vec4<f32> {
let distance_to_volume = length(cam_to_volume);
let direction = cam_to_volume / distance_to_volume;
// FIXME: t_geometry_depth is 0
// let geometry_depth = scene_depth(vert.clip_position) - distance_to_volume;
// if (geometry_depth <= 0.0)
// {
// return vec4<f32>(0.0);
// }
let geometry_depth = 3000.0;
var geometry_depth = scene_depth(vert.clip_position) - distance_to_volume;
geometry_depth = 3000.0;
if (geometry_depth <= 0.0)
{
return vec4<f32>(0.0);
}
let density = ray_march(vert.world_position.xyz, direction, geometry_depth);
var in_light = 0.0;
@ -149,16 +149,16 @@ fn fs_main(vert: FogVertexOutput) -> @location(0) vec4<f32> {
in_light = 1.0;
}
var color = vec3<f32>(0.5, 0.5, 0.5);
var base_color = vec3<f32>(mix(0.8, 0.4, density));
let ambient_strength = 0.02;
let ambient_color = color * ambient_strength;
let ambient_color = base_color * ambient_strength;
var radiance = vec3<f32>(0.0);
if (in_light > 0.0) {
// attenuation
let light_dist = length(light.position - vert.world_position.xyz);
let coef_a = 0.0;
let coef_b = 1.0;
let coef_a = 2.0;
let coef_b = 4.0;
let light_attenuation = 1.0 / (1.0 + coef_a * light_dist + coef_b * light_dist * light_dist);
radiance = light.color.rgb * light.color.a * light_attenuation * in_light;