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