Scene.h
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Scene.h
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	#ifndef _ECHOSCENE_H_
	#define _ECHOSCENE_H_

	#include <echo/Kernel/TaskGroup.h>
	#include <echo/Graphics/Renderable.h>
	#include <echo/Graphics/SceneRenderable.h>
	#include <map>
	#include <vector>

	namespace Echo
	{
	class Camera;
	class Light;
	class SceneRenderable;
	class RenderTarget;
	class Matrix4;
	class Ray;

	class Scene : public TaskGroup, public SceneRenderableVisitor
	{
	public:
	Scene();
	Scene(const std::string& name);
	virtual ~Scene();

	shared_ptr<Camera> CreateCamera(); //Creates a camera for the Scene
	shared_ptr<Camera> CreateCamera(const std::string& name); //Creates a camera for the Scene
	shared_ptr<Camera> GetCamera(const std::string& name); //Gets a camera for the Scene

	shared_ptr<Light> CreateLight(); //Creates a light for the Scene
	shared_ptr<Light> CreateLight(const std::string& name); //Creates a light for the Scene
	shared_ptr<Light> GetLight(const std::string& name); //Gets a light for the Scene

	void AddRenderable(shared_ptr< SceneRenderable > sceneRenderable, bool pickable = true);
	void RemoveRenderable(shared_ptr<SceneRenderable> sceneRenderable);

	shared_ptr< SceneRenderable > Pick(Camera& camera, Ray& ray);

	//! Builds the render queue.
	void BuildRenderQueue(const Camera& camera);
	void SceneRenderableVisit(SceneRenderable& renderable) override;
	/**
	* Override from SceneRenderableVisitor.
	* @return If performing a Render operation, the current camera used for rendering the scene, otherwise null.
	*/
	const Camera* GetCurrentCamera() override;
	void Render(RenderTarget& renderTarget, const Camera& camera);

	void SetSkyBox(shared_ptr< SceneRenderable > skyBox);

	protected:
	void ApplyLights(RenderTarget& renderTarget, const Camera& camera);
	typedef std::pair< f32, SceneRenderable* > DistanceRenderablePair;
	typedef std::pair< const std::string, shared_ptr< Light > > NamedLightPair;
	static bool DistanceCompare(const DistanceRenderablePair& a, const DistanceRenderablePair& b);
	std::map< std::string, shared_ptr<Camera> > mCameras;
	std::map< std::string, shared_ptr<Light> > mLights;
	std::list< shared_ptr< SceneRenderable > > mRenderables;
	std::list< shared_ptr< SceneRenderable > > mPickableRenderables;
	std::vector< DistanceRenderablePair > mRenderQueue;
	shared_ptr< SceneRenderable > mSkyBox;
	const Camera* mCurrentCamera; /// Camera set for operations over multiple methods.
	};
	}
	#endif

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