47 lines
1.5 KiB
C++
47 lines
1.5 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: bspline.hpp
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* Content: Declarations for B-Splines
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*
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****************************************************************************/
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#ifndef _BSPLINE_HPP
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#define _BSPLINE_HPP
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class RDBSpline
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{
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public:
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RDBSpline(DWORD dwWidth, DWORD dwHeight, DWORD dwOrderU, DWORD dwOrderV)
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{
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m_dwWidth = dwWidth;
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m_dwHeight = dwHeight;
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m_dwOrderU = dwOrderU;
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m_dwOrderV = dwOrderV;
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}
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void Sample(DWORD dwDataType, double u, double v, const BYTE *B, DWORD dwStride, DWORD dwPitch, BYTE *Q) const;
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void SampleNormal(DWORD dwDataType, double u, double v, const BYTE *pRow, DWORD dwStride, DWORD dwPitch, BYTE *Q) const;
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void SampleDegenerateNormal(DWORD dwDataType, const BYTE *pRow, DWORD dwStride, DWORD dwPitch, BYTE *Q) const;
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double TexCoordU(double u) const
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{
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return (u - double(m_dwOrderU - 1)) / double(m_dwWidth - (m_dwOrderU - 1));
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}
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double TexCoordV(double v) const
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{
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return (v - double(m_dwOrderV - 1)) / double(m_dwHeight - (m_dwOrderV - 1));
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}
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protected:
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virtual double Basis(unsigned i, unsigned k, double s) const;
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virtual double BasisPrime(unsigned i, unsigned k, double s) const;
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private:
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DWORD m_dwWidth, m_dwHeight, m_dwOrderU, m_dwOrderV;
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double Knot(unsigned i) const { return double(i); }
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};
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#endif // _BSPLINE_HPP
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