wc3re/src/render/sdlutil.hh

#ifndef WC3RE_RENDER_SDLUTIL_HH__
#define WC3RE_RENDER_SDLUTIL_HH__

namespace render {

  class SDLException : public Exception {
  public:
    SDLException() : Exception(SDL_GetError()) {
    }

    std::string toString() const override {
      return "SDLException: " + msg_;
    }
  };

  class TTFException : public Exception {
  public:
    TTFException() : Exception(TTF_GetError()) {
    }
    
    std::string toString() const override {
      return "TTFException: " + msg_;
    }
  };
  
  // Some helpers to C++11-ify SDL

  struct SDLSurfaceDeleter {
    void operator()(SDL_Surface *ptr) const {
      SDL_FreeSurface(ptr);
    }
  };

  using SDLSurfaceUPtr = std::unique_ptr<SDL_Surface, SDLSurfaceDeleter>;

  struct SDLWindowDeleter {
    void operator()(SDL_Window *ptr) const {
      SDL_DestroyWindow(ptr);
    }
  };

  using SDLWindowUPtr = std::unique_ptr<SDL_Window, SDLWindowDeleter>;
  
  struct TTFFontDeleter {
    void operator()(TTF_Font* font) const {
      TTF_CloseFont(font);
    }
  };
  
  using TTFFontUPtr = std::unique_ptr<TTF_Font, TTFFontDeleter>;


  class SDLSurfaceScopedLock {
  public:
    SDLSurfaceScopedLock(SDL_Surface *surf) : surf_(surf) {
      if (SDL_MUSTLOCK(surf_))
	if (SDL_LockSurface(surf_) != 0)
	  throw SDLException{};
    }

    SDLSurfaceScopedLock(SDLSurfaceUPtr& surf) : surf_(surf.get()) {
      if (SDL_MUSTLOCK(surf_))
	if (SDL_LockSurface(surf_) != 0)
	  throw SDLException{};
    }

    SDLSurfaceScopedLock(SDLSurfaceScopedLock const& copy) = delete;
    SDLSurfaceScopedLock& operator=(SDLSurfaceScopedLock const& copy) = delete;

    ~SDLSurfaceScopedLock() {
      if (surf_ && SDL_MUSTLOCK(surf_))
	SDL_UnlockSurface(surf_);
    }

    void unlock() {
      if (surf_ && SDL_MUSTLOCK(surf_))
	SDL_UnlockSurface(surf_);
      surf_ = nullptr;
    }
  
  private:
    SDL_Surface *surf_;
  };

  static bool operator==(SDL_Color const& a, SDL_Color const& b) {
    return ((a.r == b.r) && (a.g == b.g) && (a.b == b.b) && (a.a == b.a));
  }

  static bool operator!=(SDL_Color const& a, SDL_Color const& b) {
    return ((a.r != b.r) || (a.g != b.g) || (a.b != b.b) || (a.a != b.a));
  }

  // RAII wrapper for SDL_Init
  class SDLInit {
  public:
    SDLInit(uint32_t flags = SDL_INIT_VIDEO) {
      if (SDL_Init(flags) < 0)
	throw SDLException{};
    }

    SDLInit(SDLInit const& copy) = delete;
    SDLInit& operator=(SDLInit const& copy) = delete;

    ~SDLInit() {
      SDL_Quit();
    }
  };

  // RAII wrapper for TTF_Init
  class TTFInit {
  public:
    TTFInit() {
      if (TTF_Init() < 0)
	throw TTFException{};
    }

    TTFInit(TTFInit const& copy) = delete;
    TTFInit& operator=(TTFInit const& copy) = delete;

    ~TTFInit() {
      TTF_Quit();
    }
  };
    

  // RAII wrapper for SDL_GLContext
  class SDLGLContext {
  public:
    SDLGLContext(SDL_Window *win)
      : context_(SDL_GL_CreateContext(win)) {
      if (!context_)
	throw SDLException{};
    }

    SDLGLContext()
      : context_(nullptr) {
    }

    SDLGLContext(SDLGLContext const& copy) = delete;
    SDLGLContext& operator=(SDLGLContext const& copy) = delete;
  
    SDLGLContext(SDLGLContext && move):
      context_(move.context_) {
      move.context_ = nullptr;
    }

    SDLGLContext& operator=(SDLGLContext && move) {
      if (context_)
	SDL_GL_DeleteContext(context_);
      context_ = move.context_;
      move.context_ = nullptr;

      return *this;
    }
  
    ~SDLGLContext() {
      if (context_)
	SDL_GL_DeleteContext(context_);
    }

    operator SDL_GLContext() const {
      return context_;
    }
  private:
    SDL_GLContext context_;
  };
  
}

#endif