// Noise.h: interface for the CNoise class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_NOISE_H__D47F4AD3_03B3_4E25_957A_697628BCDDEA__INCLUDED_)
#define AFX_NOISE_H__D47F4AD3_03B3_4E25_957A_697628BCDDEA__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

class CDynamicArray2D;

// Parameter structures
struct SNoiseParams
{
	unsigned int iWidth;
	unsigned int iHeight;
	unsigned int iCover;
	unsigned int iPasses;
	float fFrequencyStep;
	float fFrequency;
	unsigned int iSmoothness;
	unsigned int iRandom;
	float fFade;
	float iSharpness;
	bool bBlueSky;
	bool bValid; // Used internally to verify serialized data, no
	             // need to set it from outside the class
};

#define RANDMASK RAND_MAX
#define MRANDOM (float)(rand() & (RANDMASK))/(RANDMASK)
#define SRANDOM ((MRANDOM) * 2) - 1

// Basis matrix for spline interpolation
#define CR00	-0.5f
#define CR01	1.5f
#define CR02	-1.5f
#define CR03	0.5f
#define CR10	1.0f
#define CR11	-2.5f
#define CR12	2.0f
#define CR13	-0.5f
#define CR20	-0.5f
#define CR21	0.0f
#define CR22	0.5f
#define CR23	0.0f
#define CR30	0.0f
#define CR31	1.0f
#define CR32	0.0f
#define CR33	0.0f

class CNoise  
{
public:
	CNoise();
	virtual ~CNoise();

	void FracSynthPass(CDynamicArray2D *hBuf, float freq, float zscale, int xres, int zres, BOOL bLoop);
	float Spline(float x, /*int nknots,*/ float *knot);

};

#endif // !defined(AFX_NOISE_H__D47F4AD3_03B3_4E25_957A_697628BCDDEA__INCLUDED_)