#include <iostream>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <getopt.h>
using namespace std;

void usage(const char * progname)
{
    cout << "Usage: " << progname << " [options] <scene-file>" << endl;
    cout << "  Options:" << endl;
    cout << "    -w|--width <image-width>" << endl;
    cout << "    -h|--height <image-height>" << endl;
    cout << "    -m|--multisample <level>" << endl;
    exit(42);
}

int main(int argc, char * argv[])
{
    int opt;
    int option_index;

    static const struct option long_options[] = {
        { "width",          required_argument, NULL, 'w' },
        { "height",         required_argument, NULL, 'h' },
        { "multisample",    required_argument, NULL, 'm' },
        { NULL,             0,                 NULL, 0   }
    };

    while ((opt = getopt_long(argc, argv, "w:h:m:",
                              long_options, &option_index)) != -1)
    {
        switch (opt)
        {
            case 'w':
                cout << "width: " << optarg << endl;
                break;
            case 'h':
                cout << "height: " << optarg << endl;
                break;
            case 'm':
                cout << "multisample level: " << optarg << endl;
                break;
            default:
                usage(argv[0]);
        }
    }

    if (optind >= argc)
    {
        usage(argv[0]);
    }

    cout << "hi" << endl;
}