sss_diffuse

One separable subsurface-diffusion blur. The including shader defines AXIS — the direction this pass blurs along — so the same body serves the horizontal and the vertical halves of the separable pair.

const AXIS: vec2<f32> = vec2<f32>(1.0, 0.0);
#include "@builtin::systems.subsurfaceScattering.sss_diffuse"