#ifndef __SHADOW_SCENE_H__
#define __SHADOW_SCENE_H__

#include "cocos2d.h"

//深度纹理帧缓存附件，可以将深度信息渲染到纹理
class RenderBufferDepthTexture :public cocos2d::experimental::RenderTargetBase
{
public:
	static RenderBufferDepthTexture* create(unsigned int size);
	bool init(unsigned int size);

	//这里修改了游戏引擎，这个函数是我增加的，用于帧缓存渲染到特殊纹理，
	//原本的帧缓存只可以渲染到Texture 2d，不可渲染到其他纹理，
	virtual void onApplyFBO(GLenum target) override;

	GLuint getShadowTextureName() const { return _tex; }
protected:
	RenderBufferDepthTexture();
	virtual ~RenderBufferDepthTexture();

private:
	GLuint _tex;
};

//将摄像机放在点光源处，生成点光源视角下场景的深度信息
class ShadowCamera :public cocos2d::Camera
{
public:
	static ShadowCamera *create(cocos2d::Camera *viewCamera, cocos2d::CameraFlag shadowFlag);
	virtual bool init(cocos2d::Camera *viewCamera, cocos2d::CameraFlag shadowFlag);
	void setPorjectionMatrix(cocos2d::Mat4 &projection);
	GLuint GetShadowTexture();
protected:
	ShadowCamera();
	virtual ~ShadowCamera();
	RenderBufferDepthTexture *_rt;

};

class ShadowSprite : public cocos2d::Sprite3D
{
public:
	//重写Create函数
	static ShadowSprite* create();
	static ShadowSprite* create(const std::string &modelPath);
	static ShadowSprite* create(const std::string &modelPath, const std::string &texturePath);
	static cocos2d::Material *getShadowMaterial(cocos2d::Sprite3DMaterial::MaterialType type);

	virtual void draw(cocos2d::Renderer *renderer, const cocos2d::Mat4 &transform, uint32_t flags) override;
	virtual void setCameraMask(unsigned short mask, bool applyChildren  = true) override;
	void setShadowCamera(ShadowCamera *camera, bool applyChildren = true);
	bool initWithFile(const std::string &path);

protected:

	static cocos2d::Sprite3DMaterial *_shadowDiffuseMaterial;
	static cocos2d::Sprite3DMaterial *_shadowDiffuseNoTexMaterial;

	ShadowSprite();
	virtual ~ShadowSprite();

	ShadowCamera *_shadowCamera;
};

class ShadowScene : public cocos2d::Scene
{
public:
    static cocos2d::Scene* createScene();

    virtual bool init();
    
    // a selector callback
	void menuBackCallback(cocos2d::Ref* pSender);

    // implement the "static create()" method manually
    CREATE_FUNC(ShadowScene);

private:
	bool _isLeftButtonDown;
	bool _isCrtlKeyDown;
	cocos2d::EventListenerMouse *_mouseListen;
	cocos2d::EventListenerKeyboard *_keyListen;
	cocos2d::Vec2 _mouseLatestPosition;

	float _angle = 0.f;
	float _aspect = 1000.f;
	float _cameraRadius = 2000.f;
};

#endif