First Light

#include "prism/raster_lab.hpp"
#include <exception>
#include <iostream>
#include <string_view>

int main(int argc, char* argv[]) {
    if (argc == 2 && std::string_view{argv[1]} == "--help") {
        std::cout << "Parallax screen-space raster reference\nUsage: prism-raster <output.ppm>\n";
        return 0;
    }
    if (argc != 2) { std::cerr << "Usage: prism-raster <output.ppm>\n"; return 1; }
    try {
        auto image = prism::rasterize(prism::demo_raster_scene());
        if (!image) { std::cerr << image.error().message << '\n'; return 1; }
        if (const auto result = prism::write_ppm(std::filesystem::path{argv[1]}, *image); !result) {
            std::cerr << result.error().message << '\n'; return 1;
        }
        std::cout << "Rasterized " << image->width << " × " << image->height << " pixels.\n";
        return 0;
    } catch (const std::exception&) {
        std::cerr << "The raster experiment could not complete.\n"; return 1;
    }
}