You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
84 lines
2.6 KiB
84 lines
2.6 KiB
/*============================================================================
|
|
*
|
|
* 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
|