osg::ArgumentParser和osg::ApplicationUsage

最新推荐文章于 2025-04-06 17:30:50 发布

pizi0475

最新推荐文章于 2025-04-06 17:30:50 发布

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本文介绍OSG中ArgumentParser参数解析器的使用方法，包括如何定义命令行选项及帮助信息，并通过实例展示了如何检查特定参数的存在。此外，还介绍了如何利用此工具管理程序参数并响应用户的帮助请求。

ArgumentParser参数解析器

使用（Examples osganimate）：
判断有没有输入指定的参数
osg::ArgumentParser arguments(&argc,argv);
while (arguments.read("--overlay")) overlay = true;

Examples osgshadow中使用方法

setDescription是描述信息，在命令行下运行程序，会提前打印出来作为提示；
addCommandLineOption是命令行选项信息
arguments.getApplicationUsage()->write()函数的默认的是打出CommandLineOption的信息，可显示在屏幕上或者文本里。

// use an ArgumentParser object to manage the program arguments.
osg::ArgumentParser arguments(&argc, argv);

    // set up the usage document, in case we need to print out how to use this program.
    arguments.getApplicationUsage()->setDescription(arguments.getApplicationName() + " is the example which demonstrates using of GL_ARB_shadow extension implemented in osg::Texture class");
    arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName());
    arguments.getApplicationUsage()->addCommandLineOption("-h or --help", "Display this information");
    arguments.getApplicationUsage()->addCommandLineOption("--positionalLight", "Use a positional light.");
    arguments.getApplicationUsage()->addCommandLineOption("--directionalLight", "Use a direction light.");
    arguments.getApplicationUsage()->addCommandLineOption("--noUpdate", "Disable the updating the of light source.");
    arguments.getApplicationUsage()->addCommandLineOption("--base", "Add a base geometry to test shadows.");
    arguments.getApplicationUsage()->addCommandLineOption("--sv", "Select ShadowVolume implementation.");
    arguments.getApplicationUsage()->addCommandLineOption("--sm", "Select ShadowMap implementation.");
    arguments.getApplicationUsage()->addCommandLineOption("--sm", "Select ShadowMap implementation.");
//    arguments.getApplicationUsage()->addCommandLineOption("--pssm", "Select ParallelSplitShadowMap implementation.");
    arguments.getApplicationUsage()->addCommandLineOption("-1", "Use test model one.");
    arguments.getApplicationUsage()->addCommandLineOption("-2", "Use test model two.");
    arguments.getApplicationUsage()->addCommandLineOption("-3", "Use test model three.");
    arguments.getApplicationUsage()->addCommandLineOption("--two-sided", "Use two-sided stencil extension for shadow volumes.");
    arguments.getApplicationUsage()->addCommandLineOption("--two-pass", "Use two-pass stencil for shadow volumes.");

// construct the viewer.
osgViewer::Viewer viewer;

    // if user request help write it out to cout.
    if (arguments.read("-h") || arguments.read("--help"))
    ...{
        arguments.getApplicationUsage()->write(std::cout);
        return 1;
    }