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Include marched fog depth in light falloff

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This commit is contained in:
Lauri Räsänen 2023-11-10 21:03:15 +02:00
parent 31c86644a7
commit 90ba17a9a9
1 changed files with 9 additions and 6 deletions
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15
res/shaders/fog.wgsl
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@ -61,7 +61,7 @@ fn fog_noise(pos: vec3<f32>) -> f32 {
return 0.8 * noise1 + 0.2 * noise2;
}
fn ray_march(origin: vec3<f32>, direction: vec3<f32>, scene_depth: f32) -> f32 {
fn ray_march(origin: vec3<f32>, direction: vec3<f32>, scene_depth: f32) -> vec2<f32> {
var density = 0.0;
var depth = 0.0;
for (var i = 0; i < FOG_MAX_STEPS; i++)
@ -81,7 +81,7 @@ fn ray_march(origin: vec3<f32>, direction: vec3<f32>, scene_depth: f32) -> f32 {
break;
}
}
return density;
return vec2<f32>(density, depth);
}
fn depth_to_linear(depth: f32) -> f32 {
@ -103,7 +103,9 @@ fn fs_main(vert: FogVertexOutput) -> @location(0) vec4<f32> {
return vec4<f32>(0.0);
}
let density = ray_march(vert.world_position.xyz, direction, max_fog_depth);
let dd = ray_march(vert.world_position.xyz, direction, max_fog_depth);
let fog_density = dd.x;
let fog_depth = dd.y;
var in_light = 0.0;
if (global_uniforms.use_shadowmaps > 0u) {
@ -134,14 +136,15 @@ fn fs_main(vert: FogVertexOutput) -> @location(0) vec4<f32> {
in_light = 1.0;
}
var base_color = vec3<f32>(mix(0.5, 0.1, density));
var base_color = vec3<f32>(mix(0.5, 0.1, fog_density));
let ambient_strength = 0.04;
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 fog_position = vert.world_position.xyz + direction * fog_depth;
let light_dist = length(light.position - fog_position);
let coef_a = 0.0;
let coef_b = 1.0;
let light_attenuation = 1.0 / (1.0 + coef_a * light_dist + coef_b * light_dist * light_dist);
@ -154,5 +157,5 @@ fn fs_main(vert: FogVertexOutput) -> @location(0) vec4<f32> {
// tonemap
result = result / (result + vec3(1.0));
return vec4(result, density * FOG_ALPHA);
return vec4(result, fog_density * FOG_ALPHA);
}