OpenSubdiv/opensubdiv/osd/drawContext.cpp

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#include "../osd/drawContext.h"

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

OsdDrawContext::~OsdDrawContext() {}

// Allows ordering of patches by type
bool
OsdDrawContext::PatchDescriptor::operator < ( PatchDescriptor const other ) const
{
    return _farDesc < other._farDesc or (_farDesc == other._farDesc and
          (_subPatch < other._subPatch or ((_subPatch == other._subPatch) and
          (_maxValence < other._maxValence or ((_maxValence == other._maxValence) and
          (_numElements < other._numElements))))));
}

// True if the descriptors are identical
bool
OsdDrawContext::PatchDescriptor::operator == ( PatchDescriptor const other ) const
{
    return _farDesc == other._farDesc and
           _subPatch == other._subPatch and
           _maxValence == other._maxValence and
           _numElements == other._numElements;
}

void
OsdDrawContext::ConvertPatchArrays(FarPatchTables::PatchArrayVector const &farPatchArrays,
                                   OsdDrawContext::PatchArrayVector &osdPatchArrays,
                                   int maxValence, int numElements)
{
    // create patch arrays for drawing (while duplicating subpatches for transition patch arrays)
    static int subPatchCounts[] = { 1, 3, 4, 4, 4, 2 }; // number of subpatches for patterns

    int numTotalPatchArrays = 0;
    for (int i = 0; i < (int)farPatchArrays.size(); ++i) {
        FarPatchTables::TransitionPattern pattern = farPatchArrays[i].GetDescriptor().GetPattern();
        numTotalPatchArrays += subPatchCounts[(int)pattern];
    }

    // allocate drawing patch arrays
    osdPatchArrays.clear();
    osdPatchArrays.reserve(numTotalPatchArrays);

    for (int i = 0; i < (int)farPatchArrays.size(); ++i) {
        FarPatchTables::TransitionPattern pattern = farPatchArrays[i].GetDescriptor().GetPattern();
        int numSubPatches = subPatchCounts[(int)pattern];

        FarPatchTables::PatchArray const &parray = farPatchArrays[i];
        FarPatchTables::Descriptor srcDesc = parray.GetDescriptor();

        for (int j = 0; j < numSubPatches; ++j) {
            PatchDescriptor desc(srcDesc, maxValence, j, numElements);

            osdPatchArrays.push_back(PatchArray(desc, parray.GetArrayRange()));
        }
    }
}

} // end namespace OPENSUBDIV_VERSION
} // end namespace OpenSubdiv