loadGeometry.cc

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// gsystem
#include "systemCadFactory.h"
#include "gsystemConventions.h"
 
// gemc
#include "gutilities.h"
 
// sqlite
#include "sqlite3.h"
 
// c++
#include <filesystem>
#include <unordered_map>
 
using namespace std;
 
namespace {
    bool geometry_column_exists(sqlite3* db, const std::string& column_name) {
        sqlite3_stmt* stmt = nullptr;
        if (sqlite3_prepare_v2(db, "SELECT name FROM PRAGMA_TABLE_INFO('geometry')", -1, &stmt, nullptr) != SQLITE_OK) {
            return false;
        }
        bool exists = false;
        while (sqlite3_step(stmt) == SQLITE_ROW) {
            const unsigned char* colText = sqlite3_column_text(stmt, 0);
            if (colText != nullptr && column_name == reinterpret_cast<const char*>(colText)) {
                exists = true;
                break;
            }
        }
        sqlite3_finalize(stmt);
        return exists;
    }
}
 
void GSystemCADFactory::loadGeometry(GSystem* s) {
    // skip ROOT system
    if (s->getName() == ROOTWORLDGVOLUMENAME) { return; }
 
    // Resolve the directory holding the CAD meshes.
    string dirLocation = gutilities::searchForDirInLocations(s->getFilePath(), possibleLocationOfFiles);
    if (!filesystem::exists(dirLocation)) {
        log->error(ERR_GDIRNOTFOUND, "CAD Directory >" + s->getFilePath() + "< not found.");
        return;
    }
 
    // Map each available mesh file to its stem (filename without extension), which is the volume name.
    unordered_map<string, string> meshByName;
    for (const auto& cf : gutilities::getListOfFilesInDirectory(dirLocation, {".stl", ".ply"})) {
        meshByName[filesystem::path(cf).stem().string()] = cf;
    }
 
    // The list of volumes to load - and their metadata - comes from the sqlite database, not from the
    // directory listing: only meshes that have a matching row in the geometry table are imported.
    string dbhost = s->get_dbhost();
    if (dbhost.empty() || dbhost == "na") { dbhost = GSYSTEMSQLITETDEFAULTFILE; }
 
    vector<string> dirs = {
        ".",
        gutilities::gemc_root().string(),
        (gutilities::gemc_root() / "examples").string()
    };
    auto dbPath = gutilities::searchForFileInLocations(dirs, dbhost);
    if (!dbPath) {
        log->error(ERR_GSQLITEERROR, "CAD factory: sqlite database <" + dbhost + "> not found.");
        return;
    }
 
    sqlite3* db = nullptr;
    if (sqlite3_open_v2(dbPath.value().c_str(), &db, SQLITE_OPEN_READONLY, nullptr) != SQLITE_OK) {
        sqlite3_close(db);
        log->error(ERR_GSQLITEERROR, "CAD factory: failed to open sqlite database <" + dbhost + ">.");
        return;
    }
    log->info(1, "CAD factory: reading definitions from sqlite database ", dbPath.value());
 
    const string placement_column = geometry_column_exists(db, "g4placement_type")
                                    ? "g4placement_type"
                                    : "'" DEFAULTG4PLACEMENTTYPE "' AS g4placement_type";
    const string sql_query =
        "SELECT DISTINCT name, solid, parameters, material, mother, position, rotations, " +
        placement_column +
        ", mfield, visible, style, color, opacity, digitization, identifier, copyOf, solidsOpr, mirror, "
        "exist, description FROM geometry WHERE experiment = ? AND system = ? AND variation = ? AND run = ?";
 
    sqlite3_stmt* stmt = nullptr;
    if (sqlite3_prepare_v2(db, sql_query.c_str(), -1, &stmt, nullptr) != SQLITE_OK) {
        log->error(ERR_GSQLITEERROR, "CAD factory: error preparing query: ", sqlite3_errmsg(db));
        sqlite3_close(db);
        return;
    }
 
    string experiment  = s->getExperiment();
    string system_name = s->getName();
    string variation   = s->getVariation();
    int    runno       = s->getRunno();
 
    sqlite3_bind_text(stmt, 1, experiment.c_str(), -1, SQLITE_TRANSIENT);
    sqlite3_bind_text(stmt, 2, system_name.c_str(), -1, SQLITE_TRANSIENT);
    sqlite3_bind_text(stmt, 3, variation.c_str(), -1, SQLITE_TRANSIENT);
    sqlite3_bind_int(stmt, 4, runno);
 
    // The "description" column (last selected field) carries the mesh path for the g4 CAD builder.
    // The CAD factory resolves it against dirLocation so the database only needs the volume name.
    constexpr int DESCRIPTION_INDEX = 19;
 
    int loaded = 0;
    int rc;
    while ((rc = sqlite3_step(stmt)) == SQLITE_ROW) {
        vector<string> gvolumePars;
        const int      colCount = sqlite3_column_count(stmt);
        for (int i = 0; i < colCount; i++) {
            const unsigned char* colText = sqlite3_column_text(stmt, i);
            gvolumePars.emplace_back(colText ? reinterpret_cast<const char*>(colText) : "");
        }
 
        const string& volumeName = gvolumePars[0];
        const string& solidType  = gvolumePars[1];
 
        // Only CAD volumes are resolved against the mesh directory. A CAD volume defined in the
        // database but missing its mesh file is skipped with a warning.
        if (solidType == GSYSTEMCADTFACTORYLABEL) {
            auto it = meshByName.find(volumeName);
            if (it == meshByName.end()) {
                log->warning("CAD factory: volume <", volumeName,
                             "> is defined in the database but no mesh file was found in <",
                             dirLocation, ">; skipping.");
                continue;
            }
            gvolumePars[DESCRIPTION_INDEX] = dirLocation + "/" + it->second;
        }
 
        s->addGVolume(gvolumePars);
        loaded++;
    }
 
    if (rc != SQLITE_DONE) {
        log->error(ERR_GSQLITEERROR, "CAD factory: sqlite error while reading geometry: ", sqlite3_errmsg(db));
    }
 
    sqlite3_finalize(stmt);
    sqlite3_close(db);
 
    log->info(0, "CAD factory: loaded ", loaded, " volume(s) for system <", system_name,
              ">, variation <", variation, ">, run ", runno,
              " (", meshByName.size(), " mesh file(s) present in <", dirLocation, ">).");
}