OpenSubdiv/opensubdiv/osd/sortedDrawContext.cpp

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#include "../osd/sortedDrawContext.h"

#include <cassert>

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

OsdSortedDrawContext::OsdSortedDrawContext(FarPatchCountVector const &patchCounts,
                                           OsdPatchArrayVector const &patchArrays) {
    _patchCounts = patchCounts;
    _patchArrays = patchArrays;
    _patchDrawRangesDirty = true;
    _primFidelity.clear();
    _primFidelity.resize(patchCounts.size());
}

void
OsdSortedDrawContext::SetPrimFidelity(int primIndex, Fidelity f) {

    assert(primIndex >= 0 && primIndex <= (int)_primFidelity.size());
    _primFidelity[primIndex] = f;
    _patchDrawRangesDirty = true;
}

OsdPatchDrawRangeVector const &
OsdSortedDrawContext::GetPatchDrawRanges(OsdPatchDescriptor desc) {
    if (_patchDrawRangesDirty) {
        _ComputePatchDrawRanges();
        _patchDrawRangesDirty = false;
    }
    return _patchDrawRanges[desc];
}

void
OsdSortedDrawContext::_ComputePatchDrawRanges() {

    _patchDrawRanges.clear();

    for (size_t i = 0; i < _patchArrays.size(); ++i) {
        OsdPatchArray const &patch = _patchArrays[i];
        OsdPatchDescriptor desc = patch.desc;

        int offset = patch.firstIndex;
        for (size_t j = 0; j < _patchCounts.size(); ++j) {

            FarPatchCount const &counts = _patchCounts[j];
            int length = 0;
            switch (desc.type) {
            case kRegular:
                length = counts.regular*16;
                break;
            case kBoundary:
                length = counts.boundary*12;
                break;
            case kCorner:
                length = counts.corner*9;
                break;
            case kGregory:
                length = counts.gregory*4;
                break;
            case kBoundaryGregory:
                length = counts.boundaryGregory*4;
                break;
            case kTransitionRegular:
                length = counts.transitionRegular[desc.pattern]*16;
                break;
            case kTransitionBoundary:
                length = counts.transitionBoundary[desc.pattern][desc.rotation]*12;
                break;
            case kTransitionCorner:
                length = counts.transitionCorner[desc.pattern][desc.rotation]*9;
                break;
            }
            if (_primFidelity[j] != 0 and length > 0) {
                _patchDrawRanges[desc].push_back(OsdPatchDrawRange(offset, length));
            }
            offset += length;
        }
    }
}

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