SDLApplication.hpp

#pragma once
#include <SDL2/SDL.h>
#include <stdexcept>
#include <string>

/**
 * @brief Base Class for Game managing SDL State.
 */
class SDLApplication
{
  public:
    /**
     * @brief Create a new Application with a Window and Renderer.
     * @param title Title shown at top of Window.
     * @param width Width of the Window.
     * @param height Height of the Window.
     * @throw std::runtime_error When Initialization of SDL2 fails.
     */
    SDLApplication(const std::string &title, int width, int height);
    SDLApplication(const SDLApplication &) = delete;
    SDLApplication &operator=(const SDLApplication &) = delete;
    virtual ~SDLApplication();

    /**
     * @brief Handle Events produced.
     * @param event The event to handle.
     */
    virtual void handleEvent(SDL_Event &event) = 0;
    /**
     * @brief Update state of the underlying Renderer for drawing.
     */
    virtual void render() = 0;
    /**
     * @brief Run the application until a SDL_QUIT Event is produced.
     */
    virtual void run();

  private:
    /**
     * @brief Title of the Window.
     */
    std::string m_Title;
    /**
     * @brief Current Width of the Window.
     */
    int m_Width;
    /**
     * @brief Current Height of the Window.
     */
    int m_Height;
    /**
     * @brief Wether the Application is running or received a Quit event.
     */
    bool m_Running;
    /**
     * @brief Helper to ensure that SDL_Quit is only called once.
     */
    bool m_SDLInitialized;
    /**
     * @brief SDL Window to use as drawing Target.
     */
    SDL_Window *m_Window;
    /**
     * @brief SDL Renderer associated with the Window.
     */
    SDL_Renderer *m_Renderer;
};