30 lines
1.1 KiB
WebGPU Shading Language
30 lines
1.1 KiB
WebGPU Shading Language
#define_import_path bevy_pbr::ambient
|
|
|
|
#import bevy_pbr::{
|
|
lighting::{EnvBRDFApprox, F_AB},
|
|
mesh_view_bindings::lights,
|
|
}
|
|
|
|
// A precomputed `NdotV` is provided because it is computed regardless,
|
|
// but `world_normal` and the view vector `V` are provided separately for more advanced uses.
|
|
fn ambient_light(
|
|
world_position: vec4<f32>,
|
|
world_normal: vec3<f32>,
|
|
V: vec3<f32>,
|
|
NdotV: f32,
|
|
diffuse_color: vec3<f32>,
|
|
specular_color: vec3<f32>,
|
|
perceptual_roughness: f32,
|
|
occlusion: vec3<f32>,
|
|
) -> vec3<f32> {
|
|
let diffuse_ambient = EnvBRDFApprox(diffuse_color, F_AB(1.0, NdotV));
|
|
let specular_ambient = EnvBRDFApprox(specular_color, F_AB(perceptual_roughness, NdotV));
|
|
|
|
// No real world material has specular values under 0.02, so we use this range as a
|
|
// "pre-baked specular occlusion" that extinguishes the fresnel term, for artistic control.
|
|
// See: https://google.github.io/filament/Filament.html#specularocclusion
|
|
let specular_occlusion = saturate(dot(specular_color, vec3(50.0 * 0.33)));
|
|
|
|
return (diffuse_ambient + specular_ambient * specular_occlusion) * lights.ambient_color.rgb * occlusion;
|
|
}
|