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/*============================================================================
* * Copyright (C) 1999-2000 Microsoft Corporation. All Rights Reserved. * * File: npatch.hpp * Content: Declarations for n-Patch scheme * ****************************************************************************/
#ifndef _NPATCH_HPP
#define _NPATCH_HPP
class RDCubicBezierTriangle{public: void SamplePosition(double u, double v, FLOAT *Q) const; void Sample(DWORD dwDataType, double u, double v, const BYTE* const B[], BYTE *Q) const;
protected: double m_B[4][4][3];
private: unsigned factorial(unsigned k) const { _ASSERT(k < 13, "Factorial out of range"); for(unsigned i = 1, t = 1; i <= k; t *= i++); return t; }
double Basis(unsigned i, unsigned j, double u, double v) const { unsigned k = 3 - i - j; double w = 1.0 - u - v; _ASSERT(i + j + k == 3, "Barycentric coordinates need to add to 3"); return (6.0 * pow(u, double(i)) * pow(v, double(j)) * pow(w, double(k))) / double(factorial(i) * factorial(j) * factorial(k)); }
};
class RDNPatch : public RDCubicBezierTriangle{public: RDNPatch(const FLOAT* const pV[], const FLOAT* const pN[], const DWORD PositionOrder, const DWORD NormalOrder); void SamplePosition(double u, double v, FLOAT *Q) const; void SampleNormal(double u, double v, const BYTE* const B[], FLOAT *Q) const;
private: void ComputeEdgeControlPoint(unsigned a, unsigned b, const FLOAT* const pV[], const FLOAT* const pN[], unsigned u, unsigned v); void ComputeNormalControlPoint(RDVECTOR3* cp, unsigned i, unsigned j, const FLOAT* const pV[], const FLOAT* const pN[]); DWORD m_PositionOrder; DWORD m_NormalOrder; // Normal coefficients
RDVECTOR3 m_N200; RDVECTOR3 m_N020; RDVECTOR3 m_N002; RDVECTOR3 m_N110; RDVECTOR3 m_N011; RDVECTOR3 m_N101; };
class RRIndexAccessor{public: RRIndexAccessor(BYTE *pBuf, DWORD dwStride, DWORD dwStart) { _ASSERT(dwStride == 2 || dwStride == 4, "Unsupported indexbuffer stride"); m_pBuf = pBuf + dwStart * dwStride; m_32 = (dwStride == 4); }
unsigned operator[](unsigned i) const { return m_32 ? ((DWORD*)m_pBuf)[i] : ((WORD*)m_pBuf)[i]; }
private: VOID *m_pBuf; bool m_32;};
#endif // _NPATCH_HPP
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