surface_weather

Weathers surfaces in place: wetness darkens and flattens, snow accumulates on what faces up.

Bindings

name	kind
scene_color	texture2d
scene_depth	texture_depth
scene_normal	texture2d
frame_cam	buffer, read vec4<f32>
lights	buffer, read vec4<f32>
weather_params	buffer, read vec4<f32>
weather_cover	buffer, read f32
weather_out	storage2d (rgba16f)

weather_out holds linear light, which the wet sheen's additive reflections can carry past 1.0 — an 8-bit target would clamp it.