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#ifndef _NVWAVEWORKS_FFT_SIMULATION_H
#define _NVWAVEWORKS_FFT_SIMULATION_H

#if WAVEWORKS_ENABLE_GNM
#include <gnm\texture.h>
#else
namespace sce { namespace Gnm { struct Texture; } }
#endif

class NVWaveWorks_GFX_Timer_Impl;

typedef struct IDirect3DTexture9* LPDIRECT3DTEXTURE9;
struct ID3D10ShaderResourceView;
struct ID3D11ShaderResourceView;

struct NVWaveWorks_FFT_Simulation_Timings
{
	float GPU_simulation_time;					 // GPU time spent on simulation
	float GPU_FFT_simulation_time;				 // GPU simulation time spent on simulation
};

class NVWaveWorks_FFT_Simulation
{
public:

	virtual ~NVWaveWorks_FFT_Simulation() {};

    virtual HRESULT initD3D11(ID3D11Device* pD3DDevice) = 0;
	virtual HRESULT initGnm() { return S_FALSE; };
	virtual HRESULT initGL2(void* /*pGLContext*/) { return S_FALSE; };
	virtual HRESULT initNoGraphics() = 0;

	virtual HRESULT reinit(const GFSDK_WaveWorks_Detailed_Simulation_Params::Cascade& params) = 0;

	virtual HRESULT addDisplacements(	const gfsdk_float2* inSamplePoints,
										gfsdk_float4* outDisplacements,
										UINT numSamples
										) = 0;

	virtual HRESULT addArchivedDisplacements(	float coord,
												const gfsdk_float2* inSamplePoints,
												gfsdk_float4* outDisplacements,
												UINT numSamples
												) = 0;

	virtual HRESULT getTimings(NVWaveWorks_FFT_Simulation_Timings&) const = 0;

	virtual gfsdk_U64 getDisplacementMapVersion() const = 0;	// Returns the kickID of the last time the displacement map was updated

	// NB: None of these AddRef's the underlying D3D resource
	virtual ID3D11ShaderResourceView** GetDisplacementMapD3D11() = 0;
	virtual sce::Gnm::Texture* GetDisplacementMapGnm() { return NULL; }
	virtual GLuint					   GetDisplacementMapGL2() = 0;
};

#endif	// _NVWAVEWORKS_FFT_SIMULATION_H