patchParam.h

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//
//   Copyright 2013 Pixar
//
//   Licensed under the terms set forth in the LICENSE.txt file available at
//   https://opensubdiv.org/license.
//
 
#ifndef OPENSUBDIV3_FAR_PATCH_PARAM_H
#define OPENSUBDIV3_FAR_PATCH_PARAM_H
 
#include "../version.h"
 
#include "../far/types.h"
 
namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {
 
namespace Far {


 
struct PatchParam {
    void Set(Index faceid, short u, short v,
             unsigned short depth, bool nonquad,
             unsigned short boundary, unsigned short transition,
             bool regular = false);

    void Clear() { field0 = field1 = 0; }

    Index GetFaceId() const { return Index(unpack(field0,28,0)); }

    unsigned short GetU() const { return (unsigned short)unpack(field1,10,22); }

    unsigned short GetV() const { return (unsigned short)unpack(field1,10,12); }

    unsigned short GetTransition() const { return (unsigned short)unpack(field0,4,28); }

    unsigned short GetBoundary() const { return (unsigned short)unpack(field1,5,7); }

    bool NonQuadRoot() const { return (unpack(field1,1,4) != 0); }

    unsigned short GetDepth() const { return (unsigned short)unpack(field1,4,0); }

    float GetParamFraction() const;

    template <typename REAL>
    void Normalize( REAL & u, REAL & v ) const;
    template <typename REAL>
    void NormalizeTriangle( REAL & u, REAL & v ) const;

    template <typename REAL>
    void Unnormalize( REAL & u, REAL & v ) const;
    template <typename REAL>
    void UnnormalizeTriangle( REAL & u, REAL & v ) const;

    bool IsTriangleRotated() const;

    bool IsRegular() const { return (unpack(field1,1,5) != 0); }
 
    unsigned int field0:32;
    unsigned int field1:32;
 
private:
    unsigned int pack(unsigned int value, int width, int offset) const {
        return (unsigned int)((value & ((1<<width)-1)) << offset);
    }
 
    unsigned int unpack(unsigned int value, int width, int offset) const {
        return (unsigned int)((value >> offset) & ((1<<width)-1));
    }
};
 
typedef std::vector<PatchParam> PatchParamTable;
 
typedef Vtr::Array<PatchParam> PatchParamArray;
typedef Vtr::ConstArray<PatchParam> ConstPatchParamArray;
 
inline void
PatchParam::Set(Index faceid, short u, short v,
                unsigned short depth, bool nonquad,
                unsigned short boundary, unsigned short transition,
                bool regular) {
    field0 = pack(faceid,    28,  0) |
             pack(transition, 4, 28);
 
    field1 = pack(u,         10, 22) |
             pack(v,         10, 12) |
             pack(boundary,   5,  7) |
             pack(regular,    1,  5) |
             pack(nonquad,    1,  4) |
             pack(depth,      4,  0);
}
 
inline float
PatchParam::GetParamFraction( ) const {
    return 1.0f / (float)(1 << (GetDepth() - NonQuadRoot()));
}
 
template <typename REAL>
inline void
PatchParam::Normalize( REAL & u, REAL & v ) const {
 
    REAL fracInv = (REAL)(1.0f / GetParamFraction());
 
    u = u * fracInv - (REAL)GetU();
    v = v * fracInv - (REAL)GetV();
}
 
template <typename REAL>
inline void
PatchParam::Unnormalize( REAL & u, REAL & v ) const {
 
    REAL frac = (REAL)GetParamFraction();
 
    u = (u + (REAL)GetU()) * frac;
    v = (v + (REAL)GetV()) * frac;
}
 
inline bool
PatchParam::IsTriangleRotated() const {
 
    return (GetU() + GetV()) >= (1 << GetDepth());
}
 
template <typename REAL>
inline void
PatchParam::NormalizeTriangle( REAL & u, REAL & v ) const {
 
    if (IsTriangleRotated()) {
        REAL fracInv = (REAL)(1.0f / GetParamFraction());
 
        int depthFactor = 1 << GetDepth();
        u = (REAL)(depthFactor - GetU()) - (u * fracInv);
        v = (REAL)(depthFactor - GetV()) - (v * fracInv);
    } else {
        Normalize(u, v);
    }
}
 
template <typename REAL>
inline void
PatchParam::UnnormalizeTriangle( REAL & u, REAL & v ) const {
 
    if (IsTriangleRotated()) {
        REAL frac = GetParamFraction();
 
        int depthFactor = 1 << GetDepth();
        u = ((REAL)(depthFactor - GetU()) - u) * frac;
        v = ((REAL)(depthFactor - GetV()) - v) * frac;
    } else {
        Unnormalize(u, v);
    }
}
 
} // end namespace Far
 
} // end namespace OPENSUBDIV_VERSION
using namespace OPENSUBDIV_VERSION;
 
} // end namespace OpenSubdiv
 
#endif /* OPENSUBDIV3_FAR_PATCH_PARAM */