// Load FtglExtrdFont
void FtglExtrdFont::loadFont()
{
    if (isLoaded()) return;

    // Check for required parameters
    if( filename() == nullptr ) {
        if (isMessageEnabled(MSG_ERROR)) {
        std::cerr << "No ttf file" << std::endl;
        }
        return;
    }

    // Generate filename
    const size_t FONTPATHNAME_LENGTH = 256;
    char fontPathname[FONTPATHNAME_LENGTH];
    if (fontDirectory() != nullptr) lcStrcpy(fontPathname, FONTPATHNAME_LENGTH, fontDirectory());
    else lcStrcpy(fontPathname, FONTPATHNAME_LENGTH, "./");
    lcStrcat(fontPathname, FONTPATHNAME_LENGTH, filename());

    FTGLExtrdFont* ftglFont = new FTGLExtrdFont(fontPathname);
    if (ftglFont != nullptr && !ftglFont->Error()) {
        // set the face size and return the pointer, then tell our base class that we have a loaded font
        ftglFont->FaceSize(getFaceSize());
        ftgl(ftglFont);
        // we'll put this here for now
        ftglFont->Depth(10);
        setFontLoaded();
    }
    else {
        if (isMessageEnabled(MSG_ERROR)) {
            std::cerr << "FtglExtrdFont::loadFont() - font did not load correctly: file: \"";
            std::cerr << fontPathname << "\"";
            std::cerr << std::endl;
        }
        std::exit(1);
    }
}