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#ifndef _SHORELINE_INTERACTION_H
#define _SHORELINE_INTERACTION_H

#include "terrain.h"
#include <D3DX11Effect.h>

#include <GFSDK_WaveWorks.h>

struct DistanceField
{
	explicit DistanceField( CTerrain* const pTerrainRenderer );
	~DistanceField();

	HRESULT Init( ID3D11Device* const pDevice );

	// --------------------------------- Accessors -----------------------------------
	ID3D11ShaderResourceView*	GetDataTextureSRV() const	{ return m_pTopDownDataSRV; } 

	void GetWorldToTopDownTextureMatrix(XMMATRIX &worldToTopDownMatrix);
	// --------------------------------- Rendering routines -----------------------------------
	void GenerateDataTexture(ID3D11DeviceContext* pDC );

private:
    DistanceField()
        : m_pTerrainRenderer( NULL )
    {}
    DistanceField& operator=(const DistanceField &tmp);

	// ---------------------------------- Not owned refrences ------------------------------------
	CTerrain* const			m_pTerrainRenderer;	// Not owned.

	// ---------------------------------- GPU shading data ------------------------------------
	ID3D11ShaderResourceView*	m_pTopDownDataSRV;
	ID3D11RenderTargetView*		m_pTopDownDataRTV;
	ID3D11Texture2D*			m_pTopDownDataTexture;
	ID3D11Texture2D*			m_pStagingTexture;

	// ---------------------------------- Top down camera data ------------------------------------
	XMFLOAT4	m_topDownViewPositionWS;
	XMFLOAT4	m_viewDirectionWS;
	XMFLOAT4X4	m_worldToViewMatrix;
	XMFLOAT4X4	m_viewToProjectionMatrix;

	bool m_shouldGenerateDataTexture;

	void renderTopDownData(ID3D11DeviceContext* pDC, const XMVECTOR eyePositionWS);
	void generateDistanceField(ID3D11DeviceContext* pDC);
	bool checkPixel( float* pTextureData, const int cx, const int cy, const int dx, const int dy) const;
	float FindNearestPixel( float* pTextureData, const int cx, const int cy, float&, float&);
};

#endif	// _SHORELINE_INTERACTION_H