SceneManager.h

/*
 * Gamedev Framework (gf)
 * Copyright (C) 2016-2021 Julien Bernard
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 */
#ifndef GF_SCENE_MANAGER_H
#define GF_SCENE_MANAGER_H

#include <vector>
#include <string>

#include "Color.h"
#include "Easings.h"
#include "Event.h"
#include "GraphicsApi.h"
#include "Ref.h"
#include "RenderStates.h"
#include "RenderWindow.h"
#include "RenderTexture.h"
#include "Scene.h"
#include "Segue.h"
#include "SegueEffect.h"
#include "Span.h"
#include "Window.h"

namespace gf {
#ifndef DOXYGEN_SHOULD_SKIP_THIS
inline namespace v1 {
#endif


  class GF_GRAPHICS_API SceneManager {
  public:
    SceneManager(const std::string& title, Vector2i size, Flags<WindowHints> hints = All);

    void run(const RenderStates &states = RenderStates());

    void pushScene(Scene& scene);

    void pushScenes(Span<const Ref<Scene>> scenes);

    void popScene();

    void popAllScenes();

    void replaceScene(Scene& scene) {
      popScene();
      pushScene(scene);
    }

    void replaceScene(Span<const Ref<Scene>> scenes) {
      popScene();
      pushScenes(scenes);
    }

    void replaceAllScenes(Scene& scene) {
      popAllScenes();
      pushScene(scene);
    }

    void replaceAllScenes(Span<const Ref<Scene>> scenes) {
      popAllScenes();
      pushScenes(scenes);
    }

    void replaceScene(Scene& scene, SegueEffect& effect, Time duration, Easing easing = Ease::linear);

    void replaceScene(Span<const Ref<Scene>> scenes, SegueEffect& effect, Time duration, Easing easing = Ease::linear);

    void replaceAllScenes(Scene& scene, SegueEffect& effect, Time duration, Easing easing = Ease::linear);

    void replaceAllScenes(Span<const Ref<Scene>> scenes, SegueEffect& effect, Time duration, Easing easing = Ease::linear);

    Window& getWindow() {
      return m_window;
    }

    RenderTarget& getRenderer() {
      return m_renderer;
    }

    Vector2f computeWindowToGameCoordinates(Vector2i coords, const View& view) const;

    Vector2i computeGameToWindowCoordinates(Vector2f coords, const View& view) const;

  private:
    virtual void doGlobalProcessEvent(const Event& event);

  private:
    void setupSegue(SegueEffect& effect, Time duration, Easing easing);

  private:
    Window m_window;
    RenderWindow m_renderer;
    bool m_scenesChanged;

    std::vector<Ref<Scene>> m_currScenes;
    std::vector<Ref<Scene>> m_prevScenes;

    RenderTexture m_targetCurrScenes;
    RenderTexture m_targetPrevScenes;
    ScreenView m_view;
    Segue m_segue;

    enum class Status {
      Scene,
      Segue,
    };

    Status m_status;
  };

#ifndef DOXYGEN_SHOULD_SKIP_THIS
}
#endif
}


#endif // GF_SCENE_MANAGER_H