UltimateCub3d/main.cpp at main · 42-Course/UltimateCub3d · GitHub

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/**
 * @file main.cpp
 * @brief Composition root: creates the window, GUI, and state machine,
 *        then runs the loop.
 *
 * Deliberately thin. Everything about *playing* lives in game::PlayState
 * and everything about *choosing a level* in game::MenuState; this file
 * only builds what outlives both (window, font, GUI context, the level
 * list) and hands it to game::StateMachine.
 *
 * The level is discovered, never hardcoded: every `.cub` under
 * `assets/maps/` is offered by the menu, which is what lets the web build
 * pick a level despite having no `argv` to pass one through.
 */

#include <algorithm>
#include <cstdint>
#include <exception>
#include <filesystem>
#include <iostream>
#include <memory>
#include <stdexcept>
#include <string>
#include <string_view>
#include <vector>

#include "core/app_context.hpp"
#include "core/image.hpp"
#include "core/input.hpp"
#include "core/state_machine.hpp"
#include "core/window.hpp"
#include "font.hpp"
#include "gfx/canvas.hpp"
#include "gui_context.hpp"
#include "states/menu_state.hpp"

namespace {

constexpr int32_t kWindowWidth = 1280;
constexpr int32_t kWindowHeight = 720;
constexpr std::string_view kMapsDir = "assets/maps";
constexpr std::string_view kFontAtlasPath = "assets/fonts/ui_font.png";
constexpr int kFontGlyphWidth = 8;
constexpr int kFontGlyphHeight = 16;

std::vector<std::string> ListCubMaps(std::string_view directory) {
  std::vector<std::string> paths;
  for (const std::filesystem::directory_entry& entry :
       std::filesystem::directory_iterator(directory)) {
    if (entry.is_regular_file() && entry.path().extension() == ".cub") {
      paths.push_back(entry.path().string());
    }
  }
  std::ranges::sort(paths);
  return paths;
}

}  // namespace

int main() {
  try {
    std::vector<std::string> map_paths = ListCubMaps(kMapsDir);
    if (map_paths.empty()) {
      throw std::runtime_error("No .cub maps found under " + std::string(kMapsDir));
    }

    engine::Window window(kWindowWidth, kWindowHeight, "cub3d");
    engine::Input input(window);

    engine::Image view_image(window, static_cast<uint32_t>(kWindowWidth),
                             static_cast<uint32_t>(kWindowHeight));
    engine::Canvas canvas(view_image);
    view_image.AttachToWindow(0, 0);

    gui::Font ui_font(window, std::string(kFontAtlasPath), kFontGlyphWidth, kFontGlyphHeight);
    gui::GuiContext gui_ctx;

    game::AppContext context{.window = &window,
                             .gui = &gui_ctx,
                             .font = &ui_font,
                             .map_paths = std::move(map_paths),
                             .loadout = {},
                             .inventory = {}};

    game::StateMachine machine(std::make_unique<game::MenuState>(&context));

    input.OnScroll([&](double /*xdelta*/, double ydelta) { machine.OnScroll(ydelta); });
    input.OnKey([&](mlx_key_data_t key) { machine.OnKey(key); });

    input.OnLoop([&]() {
      machine.Update(window.DeltaTime());
      if (machine.done()) {
        window.Close();
        return;
      }
      machine.Render(&canvas);
    });

    window.Run();
    return 0;
  } catch (const std::exception& error) {
    std::cerr << "cub3d: " << error.what() << '\n';
    return 1;
  }
}