OpenSubdiv/opensubdiv/osd/cpuEvalLimitContext.h

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#ifndef OSD_CPU_EVAL_LIMIT_CONTEXT_H
#define OSD_CPU_EVAL_LIMIT_CONTEXT_H

#include "../version.h"

#include "../osd/evalLimitContext.h"
#include "../osd/vertexDescriptor.h"
#include "../far/patchTables.h"

#include <map>
#include <stdio.h>

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

class OsdCpuEvalLimitContext : public OsdEvalLimitContext {
public:
    /// \brief Factory
    /// Returns an EvalLimitContext from the given farmesh.
    /// Note : the farmesh is expected to be feature-adaptive and have ptex
    ///        coordinates tables.
    static OsdCpuEvalLimitContext * Create(FarMesh<OsdVertex> const * farmesh);

    /// Destructor
    virtual ~OsdCpuEvalLimitContext();


    /// Binds the data buffers.
    ///
    /// @param inDesc vertex buffer data descriptor shared by all input data buffers
    ///
    /// @param inQ input vertex data
    ///
    /// @param outDesc vertex buffer data descriptor shared by all output data buffers
    ///
    /// @param outQ output vertex data
    ///
    /// @param outdQu optional output derivative along "u" of the vertex data
    ///
    /// @param outdQv optional output derivative along "v" of the vertex data
    ///
    template<class VERTEX_BUFFER, class OUTPUT_BUFFER>
    void BindVertexBuffers( OsdVertexBufferDescriptor const & inDesc, VERTEX_BUFFER *inQ,
                            OsdVertexBufferDescriptor const & outDesc, OUTPUT_BUFFER *outQ, 
                                                                       OUTPUT_BUFFER *outdQu=0, 
                                                                       OUTPUT_BUFFER *outdQv=0) {
        _inDesc = inDesc;
        _inQ = inQ ? inQ->BindCpuBuffer() : 0;
 
        _outDesc = outDesc;
        _outQ   = outQ ? outQ->BindCpuBuffer() : 0 ;
        _outdQu = outdQu ? outdQu->BindCpuBuffer() : 0 ;
        _outdQv = outdQv ? outdQv->BindCpuBuffer() : 0 ;
    }

    /// Unbind the data buffers
    void UnbindVertexBuffers() {
        _inQ    = 0;
        _outQ   = 0;
        _outdQu = 0;
        _outdQv = 0;
    }

    /// Returns the input vertex buffer descriptor
    const OsdVertexBufferDescriptor & GetInputDesc() const {
        return _inDesc;
    }

    /// Returns the output vertex buffer descriptor
    const OsdVertexBufferDescriptor & GetOutputDesc() const {
        return _outDesc;
    }

    /// Returns the input vertex buffer data
    float const * GetInputVertexData() const {
        return _inQ;
    }

    /// Returns the output vertex buffer data
    float * GetOutputVertexData() const {
        return _outQ;
    }

    /// Returns the U derivative of the output vertex buffer data
    float * GetOutputVertexDataUDerivative() const {
        return _outdQu;
    }

    /// Returns the V derivative of the output vertex buffer data
    float * GetOutputVertexDataVDerivative() const {
        return _outdQv;
    }
    
    /// Returns the vector of patch arrays
    const FarPatchTables::PatchArrayVector & GetPatchArrayVector() const {
        return _patchArrays;
    }
    
    /// Returns the vector of per-patch parametric data
    const std::vector<FarPatchParam::BitField> & GetPatchBitFields() const {
        return _patchBitFields;
    }

    /// The ordered array of control vertex indices for all the patches
    const std::vector<unsigned int> & GetControlVertices() const {
        return _patches;
    }

    /// XXXX
    const int * GetVertexValenceBuffer() const {
        return &_vertexValenceBuffer[0];
    }

    const unsigned int *GetQuadOffsetBuffer() const {
        return &_quadOffsetBuffer[0];
    }

    /// Returns a map object that can connect a faceId to a list of children patches
    const FarPatchTables::PatchMap * GetPatchesMap() const {
        return _patchMap;
    }

    int GetMaxValence() const {
        return _maxValence;
    }

protected:
    explicit OsdCpuEvalLimitContext(FarMesh<OsdVertex> const * farmesh);

private:

    // Topology data for a mesh
    FarPatchTables::PatchArrayVector     _patchArrays;    // patch descriptor for each patch in the mesh
    FarPatchTables::PTable               _patches;        // patch control vertices
    std::vector<FarPatchParam::BitField> _patchBitFields; // per-patch parametric info
    
    FarPatchTables::VertexValenceTable   _vertexValenceBuffer; // extra Gregory patch data buffers
    FarPatchTables::QuadOffsetTable      _quadOffsetBuffer;

    FarPatchTables::PatchMap * _patchMap; // map of the sub-patches given a face index

    OsdVertexBufferDescriptor _inDesc,
                              _outDesc;
    
    int _maxValence;
    
    float * _inQ,      // input vertex data
          * _outQ,     // output vertex data
          * _outdQu,   // U derivative of output vertex data
          * _outdQv;   // V derivative of output vertex data
};

} // end namespace OPENSUBDIV_VERSION
using namespace OPENSUBDIV_VERSION;

} // end namespace OpenSubdiv

#endif /* OSD_CPU_EVAL_LIMIT_CONTEXT_H */