OpenSubdiv/opensubdiv/far/mesh.h

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#ifndef FAR_MESH_H
#define FAR_MESH_H

#include "../version.h"

#include "../far/subdivisionTables.h"
#include "../far/patchTables.h"
#include "../far/vertexEditTables.h"

#include <cassert>
#include <vector>

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

template <class U> class FarDispatcher;

/// \brief Feature Adaptive Mesh class.
///
/// FarMesh is a serialized instantiation of an HbrMesh. The HbrMesh contains
/// all the topological data in a highly interconnected data structure for 
/// ease of access and modification. When instantiating a FarMesh, the factory
/// analyzes this data structure and serializes the topology into a linear
/// buffers that are ready for efficient parallel processing.

template <class U> class FarMesh {
public:

    ~FarMesh();

    /// Returns the subdivision method
    FarSubdivisionTables<U> const * GetSubdivisionTables() const { return _subdivisionTables; }

    /// Returns the list of vertices in the mesh (from subdiv level 0 to N)
    std::vector<U> & GetVertices() { return _vertices; }

    U & GetVertex(int index) { return _vertices[index]; }

    /// Returns the list of indices of the vertices of the faces in the mesh
    std::vector<int> const & GetFaceVertices(int level) const;

    /// Returns the ptex coordinates for each face at a given level. The coordinates
    /// are stored as : (int) faceindex / (ushort) u_index / (ushort) v_index
    std::vector<int> const & GetPtexCoordinates(int level) const;

    /// Returns the fvar data for each face at a given level. The data
    /// is stored as a run of totalFVarWidth floats per-vertex per-face
    /// e.g.: for UV data it has the structure of float[p][4][2] where 
    /// p=primitiveID and totalFVarWidth=2:
    ///      [ [ uv uv uv uv ] [ uv uv uv uv ] [ ... ] ]
    ///            prim 0           prim 1
    std::vector<float> const & GetFVarData(int level) const;
    int GetTotalFVarWidth() const { return _totalFVarWidth; }

    /// Returns patch tables
    FarPatchTables const * GetPatchTables() const { return _patchTables; }

    /// Returns vertex edit tables
    FarVertexEditTables<U> const * GetVertexEdit() const { return _vertexEditTables; }

    /// Returns the total number of vertices in the mesh across across all depths
    int GetNumVertices() const { return (int)(_vertices.size()); }

    /// Apply the subdivision tables to compute the positions of the vertices up
    /// to 'level'
    void Subdivide(int level=-1);

private:
    // Note : the vertex classes are renamed <X,Y> so as not to shadow the 
    // declaration of the templated vertex class U.
    template <class X, class Y> friend class FarMeshFactory;

    FarMesh() : _subdivisionTables(0), _patchTables(0), _vertexEditTables(0) { }

    // non-copyable, so these are not implemented:
    FarMesh(FarMesh<U> const &);
    FarMesh<U> & operator = (FarMesh<U> const &);

    // subdivision method used in this mesh
    FarSubdivisionTables<U> * _subdivisionTables;

    // tables of vertex indices for feature adaptive patches
    FarPatchTables * _patchTables;

    // hierarchical vertex edit tables
    FarVertexEditTables<U> * _vertexEditTables;

    // list of vertices (up to N levels of subdivision)
    std::vector<U> _vertices;

    // list of vertex indices for each face
    std::vector< std::vector<int> > _faceverts;

    // ptex coordinates for each face
    std::vector< std::vector<int> > _ptexcoordinates;

    // fvar data for each face
    std::vector< std::vector<float> > _fvarData;
    int _totalFVarWidth;    // from hbrMesh
};

template <class U>
FarMesh<U>::~FarMesh()
{
    delete _subdivisionTables;
    delete _patchTables;
    delete _vertexEditTables;
}

template <class U> std::vector<int> const &
FarMesh<U>::GetFaceVertices(int level) const {
    if ( (level>=0) and (level<(int)_faceverts.size()) )
        return _faceverts[level];
    return _faceverts[0];
}

template <class U> std::vector<int> const &
FarMesh<U>::GetPtexCoordinates(int level) const {
    if ( (level>=0) and (level<(int)_faceverts.size()) )
        return _ptexcoordinates[level];
    return _ptexcoordinates[0];
}

template <class U> std::vector<float> const &
FarMesh<U>::GetFVarData(int level) const {
    if ( (level>=0) and (level<(int)_faceverts.size()) )
        return _fvarData[level];
    return _fvarData[0];
}


template <class U> void
FarMesh<U>::Subdivide(int maxlevel) {

    assert(_subdivisionTables);

    if ( (maxlevel < 0) )
        maxlevel=_subdivisionTables->GetMaxLevel();
    else
        maxlevel = std::min(maxlevel, _subdivisionTables->GetMaxLevel());

    FarDispatcher<U> * dispatch = &FarDispatcher<U>::_DefaultDispatcher;

    for (int i=1; i<maxlevel; ++i) {
        
        _subdivisionTables->Apply(i, dispatch);

        if (_vertexEditTables)
            _vertexEditTables->Apply(i, dispatch);
    }
}

} // end namespace OPENSUBDIV_VERSION
using namespace OPENSUBDIV_VERSION;

} // end namespace OpenSubdiv

#endif /* FAR_MESH_H */