reconstruct()

StateDecoder::ReconstructionResult MayaFlux::Nexus::StateDecoder::reconstruct	(	Fabric &	fabric,
		const std::string &	base_path
	)

Patch existing entities and construct missing ones from schema.

Entities whose id exists in the fabric are patched in place. Missing entities are constructed, their callables resolved via the fabric's function registry (no-op fallback with warning if absent), and wired. Supported wiring kinds for v2: every, move_to, commit_driven. Unsupported kinds (on, use, bind) fall back to commit_driven + warning. Hard failure (bad schema, unreadable EXR, dimension mismatch) sets last_error() and returns a zeroed result.

Parameters

fabric	Target fabric. May be empty, partial, or full.
base_path	Path stem without extension.

Returns

Counts and per-entity warnings.

Definition at line 390 of file StateDecoder.cpp.

{
    ReconstructionResult result;
    m_last_error.clear();
 
    const std::string json_path = base_path + ".json";
    const std::string exr_path = base_path + ".exr";
 
    IO::JSONSerializer ser;
    auto schema_opt = ser.read<FabricSchema>(json_path);
    if (!schema_opt) {
        m_last_error = "Failed to load schema: " + ser.last_error();
        MF_ERROR(Journal::Component::Nexus, Journal::Context::FileIO, m_last_error);
        return result;
    }
    const auto& schema = *schema_opt;
 
    if (schema.version < 2 || schema.version > 4) {
        m_last_error = "Unsupported schema version: " + std::to_string(schema.version);
        MF_ERROR(Journal::Component::Nexus, Journal::Context::FileIO, m_last_error);
        return result;
    }
 
    if (schema.entities.empty()) {
        m_last_error = "Schema contains no entities: " + json_path;
        MF_ERROR(Journal::Component::Nexus, Journal::Context::FileIO, m_last_error);
        return result;
    }
 
    const uint32_t expected_rows = schema.version >= 4 ? 5 : k_exr_rows;
    auto pv_opt = load_exr(exr_path, static_cast<uint32_t>(schema.entities.size()), expected_rows, m_last_error);
    if (!pv_opt) {
        MF_ERROR(Journal::Component::Nexus, Journal::Context::FileIO, m_last_error);
        return result;
    }
    auto& pv = *pv_opt;
    const auto* pixels = pv.image.as_float();
    const uint32_t width = pv.width;
    const auto& r = schema.ranges;
 
    const auto existing_ids = fabric.all_ids();
    const std::unordered_set<uint32_t> existing(existing_ids.begin(), existing_ids.end());
 
    for (size_t i = 0; i < schema.entities.size(); ++i) {
        const auto& entry = schema.entities[i];
 
        if (!kind_known(entry.kind)) {
            result.warnings.push_back("Unknown kind '" + entry.kind
                + "' for id " + std::to_string(entry.id) + ", skipping");
            ++result.skipped;
            continue;
        }
 
        const size_t row0 = (static_cast<size_t>(0) * width + i) * k_channels;
        const size_t row1 = (static_cast<size_t>(1) * width + i) * k_channels;
        const size_t row2 = (static_cast<size_t>(2) * width + i) * k_channels;
 
        const glm::vec3 position {
            denormalize((*pixels)[row0 + 0], r.pos_x),
            denormalize((*pixels)[row0 + 1], r.pos_y),
            denormalize((*pixels)[row0 + 2], r.pos_z),
        };
        const float intensity = denormalize((*pixels)[row0 + 3], r.intensity);
        const float radius = denormalize((*pixels)[row2 + 0], r.radius);
        const float query_radius = denormalize((*pixels)[row2 + 1], r.query_radius);
 
        auto read_color = [&]() -> glm::vec3 {
            return {
                denormalize((*pixels)[row1 + 0], r.color_r),
                denormalize((*pixels)[row1 + 1], r.color_g),
                denormalize((*pixels)[row1 + 2], r.color_b),
            };
        };
        auto read_size = [&]() {
            return denormalize((*pixels)[row1 + 3], r.size);
        };
 
        if (existing.count(entry.id)) {
            // -----------------------------------------------------------------
            // Patch existing entity.
            // -----------------------------------------------------------------
            switch (parse_kind(entry.kind)) {
            case Fabric::Kind::Emitter: {
                auto e = fabric.get_emitter(entry.id);
                if (!e) {
                    ++result.skipped;
                    continue;
                }
                if (!entry.influence_fn_name.empty() && e->fn_name() != entry.influence_fn_name) {
                    result.warnings.push_back("Emitter " + std::to_string(entry.id)
                        + " fn_name mismatch: schema='" + entry.influence_fn_name
                        + "' live='" + e->fn_name() + "'");
                }
                e->set_position(position);
                e->set_intensity(intensity);
                if (entry.color) {
                    e->set_color(read_color());
                }
                if (entry.size) {
                    e->set_size(read_size());
                }
                e->set_radius(radius);
                break;
            }
            case Fabric::Kind::Sensor: {
                auto s = fabric.get_sensor(entry.id);
                if (!s) {
                    ++result.skipped;
                    continue;
                }
                if (!entry.perception_fn_name.empty() && s->fn_name() != entry.perception_fn_name) {
                    result.warnings.push_back("Sensor " + std::to_string(entry.id)
                        + " fn_name mismatch: schema='" + entry.perception_fn_name
                        + "' live='" + s->fn_name() + "'");
                }
                s->set_position(position);
                s->set_query_radius(query_radius);
                break;
            }
            case Fabric::Kind::Agent: {
                auto a = fabric.get_agent(entry.id);
                if (!a) {
                    ++result.skipped;
                    continue;
                }
                if (!entry.perception_fn_name.empty() && a->perception_fn_name() != entry.perception_fn_name) {
                    result.warnings.push_back("Agent " + std::to_string(entry.id)
                        + " perception_fn mismatch: schema='" + entry.perception_fn_name + "'");
                }
                if (!entry.influence_fn_name.empty() && a->influence_fn_name() != entry.influence_fn_name) {
                    result.warnings.push_back("Agent " + std::to_string(entry.id)
                        + " influence_fn mismatch: schema='" + entry.influence_fn_name + "'");
                }
                a->set_position(position);
                a->set_intensity(intensity);
                if (entry.color) {
                    a->set_color(read_color());
                }
                if (entry.size) {
                    a->set_size(read_size());
                }
                a->set_radius(radius);
                a->set_query_radius(query_radius);
                break;
            }
            }
            ++result.patched;
 
        } else {
            // -----------------------------------------------------------------
            // Construct missing entity.
            // -----------------------------------------------------------------
            switch (parse_kind(entry.kind)) {
            case Fabric::Kind::Emitter: {
                auto fn_ptr = fabric.resolve_influence_fn(entry.influence_fn_name);
                Emitter::InfluenceFn fn;
                if (!fn_ptr || !*fn_ptr) {
                    result.warnings.push_back("Emitter: unknown influence_fn '"
                        + entry.influence_fn_name + "', using no-op");
                    fn = [](const InfluenceContext&) { };
                } else {
                    fn = *fn_ptr;
                }
                auto emitter = std::make_shared<Emitter>(entry.influence_fn_name, std::move(fn));
                emitter->set_position(position);
                emitter->set_intensity(intensity);
                emitter->set_radius(radius);
                if (entry.color) {
                    emitter->set_color(read_color());
                }
                if (entry.size) {
                    emitter->set_size(read_size());
                }
                auto wiring = fabric.wire(emitter);
                if (emitter->id() != entry.id) {
                    result.warnings.push_back("Emitter schema_id=" + std::to_string(entry.id)
                        + " reconstructed as runtime_id=" + std::to_string(emitter->id()));
                }
                apply_wiring(std::move(wiring), entry.wiring, result.warnings);
                break;
            }
            case Fabric::Kind::Sensor: {
                auto fn_ptr = fabric.resolve_perception_fn(entry.perception_fn_name);
                Sensor::PerceptionFn fn;
                if (!fn_ptr || !*fn_ptr) {
                    result.warnings.push_back("Sensor: unknown perception_fn '"
                        + entry.perception_fn_name + "', using no-op");
                    fn = [](const PerceptionContext&) { };
                } else {
                    fn = *fn_ptr;
                }
                auto sensor = std::make_shared<Sensor>(query_radius,
                    entry.perception_fn_name, std::move(fn));
                sensor->set_position(position);
                auto wiring = fabric.wire(sensor);
                if (sensor->id() != entry.id) {
                    result.warnings.push_back("Sensor schema_id=" + std::to_string(entry.id)
                        + " reconstructed as runtime_id=" + std::to_string(sensor->id()));
                }
                apply_wiring(std::move(wiring), entry.wiring, result.warnings);
                break;
            }
            case Fabric::Kind::Agent: {
                auto pfn_ptr = fabric.resolve_perception_fn(entry.perception_fn_name);
                Agent::PerceptionFn pfn;
                if (!pfn_ptr || !*pfn_ptr) {
                    result.warnings.push_back("Agent: unknown perception_fn '"
                        + entry.perception_fn_name + "', using no-op");
                    pfn = [](const PerceptionContext&) { };
                } else {
                    pfn = *pfn_ptr;
                }
                auto ifn_ptr = fabric.resolve_influence_fn(entry.influence_fn_name);
                Agent::InfluenceFn ifn;
                if (!ifn_ptr || !*ifn_ptr) {
                    result.warnings.push_back("Agent: unknown influence_fn '"
                        + entry.influence_fn_name + "', using no-op");
                    ifn = [](const InfluenceContext&) { };
                } else {
                    ifn = *ifn_ptr;
                }
                auto agent = std::make_shared<Agent>(query_radius,
                    entry.perception_fn_name, std::move(pfn),
                    entry.influence_fn_name, std::move(ifn));
                agent->set_position(position);
                agent->set_intensity(intensity);
                agent->set_radius(radius);
                agent->set_query_radius(query_radius);
                if (entry.color) {
                    agent->set_color(read_color());
                }
                if (entry.size) {
                    agent->set_size(read_size());
                }
                auto wiring = fabric.wire(agent);
                if (agent->id() != entry.id) {
                    result.warnings.push_back("Agent schema_id=" + std::to_string(entry.id)
                        + " reconstructed as runtime_id=" + std::to_string(agent->id()));
                }
                apply_wiring(std::move(wiring), entry.wiring, result.warnings);
                break;
            }
            }
            ++result.constructed;
        }
    }
 
    MF_INFO(Journal::Component::Nexus, Journal::Context::FileIO,
        "StateDecoder::reconstruct: constructed={} patched={} skipped={} warnings={}",
        result.constructed, result.patched, result.skipped, result.warnings.size());
 
    return result;
}

References a, MayaFlux::Nexus::Fabric::Agent, MayaFlux::Nexus::Fabric::all_ids(), MayaFlux::Nexus::StateDecoder::ReconstructionResult::constructed, MayaFlux::Nexus::Fabric::Emitter, MayaFlux::Journal::FileIO, MayaFlux::Nexus::Fabric::get_agent(), MayaFlux::Nexus::Fabric::get_emitter(), MayaFlux::Nexus::Fabric::get_sensor(), intensity, MayaFlux::IO::JSONSerializer::last_error(), m_last_error, MF_ERROR, MF_INFO, MayaFlux::Journal::Nexus, MayaFlux::Nexus::StateDecoder::ReconstructionResult::patched, pixels, position, query_radius, radius, MayaFlux::IO::JSONSerializer::read(), MayaFlux::Nexus::Fabric::resolve_influence_fn(), MayaFlux::Nexus::Fabric::resolve_perception_fn(), MayaFlux::Nexus::Fabric::Sensor, MayaFlux::Nexus::StateDecoder::ReconstructionResult::skipped, MayaFlux::Nexus::StateDecoder::ReconstructionResult::warnings, width, MayaFlux::Nexus::Fabric::wire(), and wiring.

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