//
// Urho3D Engine
// Copyright (c) 2008-2012 Lasse Öörni
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

#pragma once

#include "Ptr.h"
#include "Rect.h"

class Camera;
class PostProcess;
class Scene;

/// %Viewport definition either for a render surface or the backbuffer.
class Viewport : public RefCounted
{
public:
    /// Construct with defaults.
    Viewport();
    /// Construct with a full rectangle.
    Viewport(Scene* scene, Camera* camera);
    /// Construct with a specified rectangle.
    Viewport(Scene* scene, Camera* camera, const IntRect& rect);
    /// Construct with a full rectangle and post-processing effects.
    Viewport(Scene* scene, Camera* camera, const Vector<SharedPtr<PostProcess> >& postProcesses);
    /// Construct with a specified rectangle and post-processing effects.
    Viewport(Scene* scene, Camera* camera, const IntRect& rect, const Vector<SharedPtr<PostProcess> >& postProcesses);
    /// Destruct.
    ~Viewport();
    
    /// %Set scene.
    void SetScene(Scene* scene);
    /// %Set camera.
    void SetCamera(Camera* camera);
    /// %Set rectangle.
    void SetRect(const IntRect& rect);
    /// Add a post-processing effect at the end of the chain.
    void AddPostProcess(PostProcess* effect);
    /// Insert a post-processing effect at position in the chain.
    void InsertPostProcess(unsigned index, PostProcess* effect);
    /// Remove a post-processing effect.
    void RemovePostProcess(PostProcess* effect);
    /// Remove a post-processing effect by index.
    void RemovePostProcess(unsigned index);
    /// Remove all post-processing effects.
    void RemoveAllPostProcesses();
    
    /// Return scene.
    Scene* GetScene() const;
    /// Return camera.
    Camera* GetCamera() const;
    /// Return rectangle.
    const IntRect& GetRect() const { return rect_; }
    /// Return number of post-processing effects.
    unsigned GetNumPostProcesses() const { return postProcesses_.Size(); }
    /// Return post-processing effect at index.
    PostProcess* GetPostProcess(unsigned index) const;
    /// Return all post-processing effects.
    const Vector<SharedPtr<PostProcess> >& GetPostProcesses() const { return postProcesses_; }
    
private:
    /// Scene pointer.
    WeakPtr<Scene> scene_;
    /// Camera pointer.
    WeakPtr<Camera> camera_;
    /// Viewport rectangle.
    IntRect rect_;
    /// Post-processing effects.
    Vector<SharedPtr<PostProcess> > postProcesses_;
};