class CTerrainNode : public ISceneNode
{
public:
	~CTerrainNode( );

	virtual HRESULT Create( CScene *pScene );
	virtual void Release( );

	HRESULT Init( CScene *pScene );

	virtual HRESULT Update( float fTimestep );

	virtual HRESULT Prerender( CScene *pScene );
	virtual HRESULT Render( CScene *pScene );
	virtual HRESULT Postrender( CScene *pScene );

	void SetWorldViewProjMatrix( D3DXMATRIX matrixWorld );

protected:

	CTerrainNode( );

private:
	struct Clipmap
	{
		CTextureWrapper* m_pHeightMap;	//One Channel FP Height Data (DXGI_FORMAT_R32_FLOAT)
		CTextureWrapper* m_pNormalMap;	//Four Channel Texture (DXGI_FORMAT_R8G8B8A8_UNORM)
		
		ID3D10EffectShaderResourceVariable* m_pHeightTextureVar;
		ID3D10EffectShaderResourceVariable* m_pNormalTextureVar;
	};

private:

	//Algorithm Data.
	Clipmap* m_pClipmaps;
	
	D3DXVECTOR3 m_v3ViewerPos;						//Viewer position (Vx, Vz needed for block updates - Vy for active_region calcs).

	unsigned long m_ulLevels;						//L
	unsigned long m_ulGridSize;						//n (2^k - 1).

	//M x M Block Geometry.
	unsigned long m_ulBlockVertexRes;				//m (( n + 1 )/4)
	unsigned long m_ulBlockNumVertices;	
	unsigned long m_ulBlockNumTriangles;

	//M x 3 Block Geometry.
	unsigned long m_ulRingNumVertices;
	unsigned long m_ulRingNumTriangles;

	//( 2m + 1 ) x 2 Trim Geometry.
	unsigned long m_ulTrimNumVertices;
	unsigned long m_ulTrimNumTriangles;

	//Outer Border of Degenerate Triangles.
	unsigned long m_ulDTNumVertices;
	unsigned long m_ulDTNumTriangles;
	
	//Shader Variables
		//Frame.
	D3DXMATRIX m_matWorldViewProj;
	D3DXVECTOR3 m_v3LightDir;
	
		//Block.	(Per-Clipmap?)
	D3DXVECTOR4 m_v4FineTextureOrigin;
	D3DXVECTOR2 m_v2AlphaOffset;
	D3DXVECTOR4 m_v4ScaleFactor;
	float m_fZScaleFactor;
	float m_fOneOverWidth;

	//Direct3D Data.
	CInputDescWrapper* m_pInputLayout;

	CVertexBufferWrapper* m_pBlockVB;							//m x m Block.
	CVertexBufferWrapper* m_pRingVB[TERRAIN_LRING_COUNT];		//m x 3 Ring Fix-Up.
	CVertexBufferWrapper* m_pTrimVB;							//(2m + 1)*2 Interior Trim.
	CVertexBufferWrapper* m_pDegenerateTriVB;					//Outer Degenerate Triangles.

	CIndexBufferWrapper* m_pBlockIB;
	CIndexBufferWrapper* m_pRingIB;

	CTextureWrapper* m_pDiffuseTexture;

	ID3D10Effect* m_pEffect;
	ID3D10EffectTechnique* m_pRenderTechnique;
	ID3D10EffectTechnique* m_pUpsampleTechnique;
	ID3D10EffectTechnique* m_pNormalCalcTechnique;

	ID3D10EffectMatrixVariable* m_pViewVariable;
	ID3D10EffectMatrixVariable* m_pProjectionVariable;
	
	//Vertex/Pixel Shader Handles.
	ID3D10EffectMatrixVariable* m_pWorldViewProjVar;		//matrix.
	ID3D10EffectVectorVariable* m_pViewerPositionVar;		//float2.
	ID3D10EffectVectorVariable* m_pLightDirVar;				//float3.
	ID3D10EffectVectorVariable* m_pFineTextureOriginVar;	//float4.
	ID3D10EffectVectorVariable* m_pAlphaOffsetVar;			//float2.
	ID3D10EffectVectorVariable* m_pScaleFactorVar;			//float4.
	ID3D10EffectScalarVariable* m_pZScaleFactorVar;			//float.
	ID3D10EffectScalarVariable* m_pOneOverWidthVar;			//float.

	//Constants
	static const LPCTSTR TERRAINNODE_INPUTLAYOUTWRAPPER_NAME;
	static const LPCTSTR TERRAINNODE_BLOCK_VBWRAPPER_NAME;
	static const LPCTSTR TERRAINNODE_RING_VBWRAPPER_NAME;
	static const LPCTSTR TERRAINNODE_TRIM_VBWRAPPER_NAME;
	static const LPCTSTR TERRAINNODE_DEGENTRI_VBWRAPPER_NAME;
	static const LPCTSTR TERRAINNODE_BLOCK_IBWRAPPER_NAME;
	static const LPCTSTR TERRAINNODE_RING_IBWRAPPER_NAME;

	static const LPCTSTR TERRAINNODE_EFFECT_FILENAME;
	static const LPCSTR TERRAINNODE_EFFECT_SHADERPROFILE;
	
	//Algorithm constants.
	static const unsigned long TERRAINNODE_GRIDSIZE_DEFAULT;

friend class CSceneNodeManager;
};

class CWin32Input
{
public:

	//Input Management Methods.
	static void Activate( );
	static void Deactivate( );
	
	//Input State Query Methods
		//Keyboard.
	static void HandleKeyboardMessage( UINT uiMsg, WPARAM wParam, LPARAM lParam );
		
	static inline bool IsKeyboardActive( ) 	{	return( m_bActiveKeyboard );	}

	static inline bool IsKeyDown( long lChar )	{	return( m_bKeyboardState[lChar] );	}
	static inline bool IsKeyUp( long lChar )	{	return( !m_bKeyboardState[lChar] );	}

	static void SetKeyState( long lChar, bool isKeyDown );
	
		//Mouse
	static inline bool IsMouseActive( ) 	{	return( m_bActiveMouse );		}
	static void SetMouseClip( bool bClip, long lLeft = -1, long lTop = -1, long lRight = -1, long lBottom  = -1 );

	static void SetMouseButtonState( unsigned long ulMouseButton, bool isButtonDown );
	static void SetMousePos( LPARAM lParam );
	static void SetMouseWheel( WPARAM wParam );
	
	static void HoldMouse( bool bHold, bool bHideCursor = false );
	
	static inline void GetMousePos( long &x, long &y )		{	x = m_lMousePosX;		y = m_lMousePosY;		}
	static inline void GetMouseDelta( long &dx, long &dy )	{	dx = m_lMouseDeltaX;	dy = m_lMouseDeltaY;	}
	
	static bool IsMouseButtonDown( long lButton );
	static bool IsMouseButtonUp( long lButton );

private:

CWin32Input( );
~CWin32Input( );

private:

	//Keyboard Members.
	static bool m_bKeyboardState[WIN32INPUT_NUM_KEYBOARD_STATES];
	static long m_lKeyModifiers;
	static bool m_bActiveKeyboard;
	
	//Mouse Members.
	static bool m_bMouseButtonState[MOUSE_BUTTON_COUNT];
	static long m_lMousePosX, m_lMousePosY;
	static long m_lMousePosXPrev, m_lMousePosYPrev;
	static long m_lMouseDeltaX, m_lMouseDeltaY;
	static long m_lMouseWheelDelta;
	static bool m_bActiveMouse;
	
	static RECT m_rectMouseClip;
	static bool m_bClipMouse;
};