evaluate()

void MayaFlux::Nexus::Expanse::evaluate	(	uint32_t	fabric_id,
		std::span< const std::pair< uint32_t, glm::vec3 > >	snapshot
	)

Evaluate a spatial snapshot from one Fabric against this Expanse.

Runs the containment predicate against each position in snapshot, diffs the result against the previous occupant set for fabric_id, fires on_enter / on_exit for the difference, and updates the stored set. Each Fabric maintains independent occupant state.

Parameters

fabric_id	Stable id of the calling Fabric.
snapshot	All indexed positions from that Fabric's spatial index.

Definition at line 7 of file Expanse.cpp.

{
    auto& prev = m_occupants_by_fabric[fabric_id];
 
    std::unordered_set<uint32_t> inside;
    for (const auto& [eid, pos] : snapshot) {
        if (m_contains && m_contains(pos))
            inside.insert(eid);
    }
 
    if (m_on_enter) {
        for (uint32_t eid : inside) {
            if (!prev.contains(eid))
                m_on_enter(eid);
        }
    }
 
    if (m_on_exit) {
        for (uint32_t eid : prev) {
            if (!inside.contains(eid))
                m_on_exit(eid);
        }
    }
 
    if (inside.empty()) {
        m_occupants_by_fabric.erase(fabric_id);
    } else {
        prev = std::move(inside);
    }
}

References m_contains, m_occupants_by_fabric, m_on_enter, and m_on_exit.