OpenSubdiv/opensubdiv/far/endCapBSplineBasisPatchFactory.h

//
//   Copyright 2015 Pixar
//
//   Licensed under the Apache License, Version 2.0 (the "Apache License")
//   with the following modification; you may not use this file except in
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//      the License and to reproduce the content of the NOTICE file.
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//       http://www.apache.org/licenses/LICENSE-2.0
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#ifndef OPENSUBDIV3_FAR_END_CAP_BSPLINE_BASIS_PATCH_FACTORY_H
#define OPENSUBDIV3_FAR_END_CAP_BSPLINE_BASIS_PATCH_FACTORY_H

#include "../far/patchTableFactory.h"
#include "../far/gregoryBasis.h"
#include "../vtr/level.h"

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

namespace Far {

class TopologyRefiner;

/// \brief A BSpline endcap factory
///
/// note: This is an internal use class in PatchTableFactory, and
///       will be replaced with SdcSchemeWorker for mask coefficients
///       and Vtr::Level for topology traversal.
///
class EndCapBSplineBasisPatchFactory {

public:
    // XXXX need to add support for face-varying channel stencils

    /// \brief This factory accumulates vertex for bspline basis end cap
    ///
    /// @param refiner                TopologyRefiner from which to generate patches
    ///
    /// @param shareBoundaryVertices  Use same boundary vertices for neighboring
    ///                               patches. It reduces the number of stencils
    ///                               to be used.
    ///
    EndCapBSplineBasisPatchFactory(TopologyRefiner const & refiner);

    /// \brief Returns end patch point indices for \a faceIndex of \a level.
    ///        Note that end patch points are not included in the vertices in
    ///        the topologyRefiner, they're expected to come after the end.
    ///        The returning indices are offsetted by refiner->GetNumVerticesTotal.
    ///
    /// @param level            vtr refinement level
    ///
    /// @param faceIndex        vtr faceIndex at the level
    ///
    ConstIndexArray GetPatchPoints(
        Vtr::internal::Level const * level, Index faceIndex);

    /// \brief Create a StencilTable for end patch points, relative to the max
    ///        subdivision level.
    ///
    StencilTable* CreateVertexStencilTable() const {
        return GregoryBasis::CreateStencilTable(_vertexStencils);
    }

    /// \brief Create a StencilTable for end patch varying primvar.
    ///        This table is used as a convenient way to get varying primvars
    ///        populated on end patch points along with positions.
    ///
    StencilTable* CreateVaryingStencilTable() const {
        return GregoryBasis::CreateStencilTable(_varyingStencils);
    }

private:
    TopologyRefiner const *_refiner;
    GregoryBasis::PointsVector _vertexStencils;
    GregoryBasis::PointsVector _varyingStencils;
    int _numVertices;
    int _numPatches;
    std::vector<Index> _patchPoints;
};

} // end namespace Far

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

#endif  // OPENSUBDIV3_FAR_END_CAP_BSPLINE_BASIS_PATCH_FACTORY_H