Struct HotReloadApplyParts 

pub struct HotReloadApplyParts<'a> {
    pub backend: &'a mut dyn RenderBackend,
    pub world_reload: &'a Option<WorldReloadState>,
    pub last_fog_settings: &'a mut Option<FogSettings>,
}

Disjoint mutable screen of the GraphicsSystem fields the hot-reload passes edit in one tick: the active backend, the texture-name map for runtime decal / emitter spawn, and the fog bookkeeping the world.jsonl reload pass dedupes against. Returned by GraphicsSystem::hot_reload_apply_parts so the binary-only DebugHook::tick drive can apply the reload passes from outside the per-system step without the library depending on it. The reload catalogue and in-flight state live on the debug side (crate::debug::hot_reload), built from HotReloadSources. The library never constructs this; the fields are read from the debug drive alone.

Fields

backend: &'a mut dyn RenderBackend

The live render backend.

world_reload: &'a Option<WorldReloadState>

The in-flight world reload, when one is running.

last_fog_settings: &'a mut Option<FogSettings>

The fog settings last pushed, so a reload can detect a change.