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 );

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

    Index GetFaceId() const { return Index(field0 & 0xfffffff); }

    unsigned short GetU() const { return (unsigned short)((field1 >> 22) & 0x3ff); }

    unsigned short GetV() const { return (unsigned short)((field1 >> 12) & 0x3ff); }

    unsigned short GetTransition() const { return (unsigned short)((field0 >> 28) & 0xf); }

    unsigned short GetBoundary() const { return (unsigned short)((field1 >> 8) & 0xf); }

    bool NonQuadRoot() const { return (field1 >> 4) & 0x1; }

    float GetParamFraction() const;

    unsigned short GetDepth() const { return  (unsigned short)(field1 & 0xf); }

    void Normalize( float & u, float & v ) const;

    unsigned int field0:32;
    unsigned int field1:32;
};

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 ) {
    field0 = (((unsigned int)faceid) & 0xfffffff) |
             ((transition & 0xf) << 28);
    field1 = ((u & 0x3ff) << 22) |
             ((v & 0x3ff) << 12) |
             ((boundary & 0xf) << 8) |
             ((nonquad ? 1:0) << 4) |
             (nonquad ? depth+1 : depth);
}

inline float
PatchParam::GetParamFraction( ) const {
    if (NonQuadRoot()) {
        return 1.0f / float( 1 << (GetDepth()-1) );
    } else {
        return 1.0f / float( 1 << GetDepth() );
    }
}

inline void
PatchParam::Normalize( float & u, float & v ) const {

    float frac = GetParamFraction();

    // top left corner
    float pu = (float)GetU()*frac;
    float pv = (float)GetV()*frac;

    // normalize u,v coordinates
    u = (u - pu) / frac,
    v = (v - pv) / frac;
}

} // end namespace Far

} // end namespace OPENSUBDIV_VERSION
using namespace OPENSUBDIV_VERSION;

} // end namespace OpenSubdiv

#endif /* OPENSUBDIV3_FAR_PATCH_PARAM */