patchParam.h

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//
//   Copyright 2013 Pixar
//
//   Licensed under the Apache License, Version 2.0 (the "Apache License")
//   with the following modification; you may not use this file except in
//   compliance with the Apache License and the following modification to it:
//   Section 6. Trademarks. is deleted and replaced with:
//
//   6. Trademarks. This License does not grant permission to use the trade
//      names, trademarks, service marks, or product names of the Licensor
//      and its affiliates, except as required to comply with Section 4(c) of
//      the License and to reproduce the content of the NOTICE file.
//
//   You may obtain a copy of the Apache License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the Apache License with the above modification is
//   distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
//   KIND, either express or implied. See the Apache License for the specific
//   language governing permissions and limitations under the Apache 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 */