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#ifndef FAR_KERNEL_BATCH_H
#define FAR_KERNEL_BATCH_H

#include "../version.h"

#include <vector>

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {


/// \brief A GP Compute Kernel descriptor.
///
/// Vertex refinement through subdivision schemes requires the successive
/// application of dedicated compute kernels. OpenSubdiv groups these vertices
/// in batches based on their topology in order to minimize the number of kernel
/// switches to process a given primitive.
/// 
///       [Subdivision table for kernel k]
///        ------+---------------------------------+-----
///              |   Prim p, Level n               |
///        ------+---------------------------------+-----
///              |             | batch range |     |
///        ------+---------------------------------+-----
///              ^             ^             ^     
///        tableOffset       start          end
///                            .             .
///                            .             .
///                            .             .
///      [VBO]                 .             .
///        ------+---------------------------------+-----
///              |   Prim p, Kernel k, Level n     |
///        ------+---------------------------------+-----
///              |             | batch range |     | 
///        ------+---------------------------------+-----
///              ^             ^             ^
///        vertexOffset      start          end
///
class FarKernelBatch {

public:

    enum KernelType {
        CATMARK_FACE_VERTEX,
        CATMARK_EDGE_VERTEX,
        CATMARK_VERT_VERTEX_A1,
        CATMARK_VERT_VERTEX_A2,
        CATMARK_VERT_VERTEX_B,
        LOOP_EDGE_VERTEX,
        LOOP_VERT_VERTEX_A1,
        LOOP_VERT_VERTEX_A2,
        LOOP_VERT_VERTEX_B,
        BILINEAR_FACE_VERTEX,
        BILINEAR_EDGE_VERTEX,
        BILINEAR_VERT_VERTEX,
        HIERARCHICAL_EDIT,
    };

    /// Constructor.
    /// 
    /// @param kernelType    the type of compute kernel kernel
    ///
    /// @param level         the level of subdivision of the vertices in the batch
    ///
    /// @param tableIndex    edit index (for the hierarchical edit kernels only)
    ///
    /// @param start         index of the first vertex in the batch
    ///
    /// @param end           index of the last vertex in the batch
    ///
    /// @param tableOffset   XXXX
    ///
    /// @param vertexOffset  XXXX
    ///
    /// @param meshIndex     XXXX
    ///
    FarKernelBatch( KernelType kernelType,
                    int level,
                    int tableIndex,
                    int start,
                    int end,
                    int tableOffset,
                    int vertexOffset,
                    int meshIndex=0) :
        _kernelType(kernelType),
        _level(level),
        _tableIndex(tableIndex),
        _start(start),
        _end(end),
        _tableOffset(tableOffset),
        _vertexOffset(vertexOffset),
        _meshIndex(meshIndex) {
    }

    /// Returns the type of kernel to apply to the vertices in the batch.
    KernelType GetKernelType() const {
        return _kernelType;
    }


    /// Returns the subdivision level of the vertices in the batch
    int GetLevel() const {
        return _level;
    }


    
    /// Returns the index of the first vertex in the batch
    int GetStart() const {
        return _start;
    }

    /// Returns the index of the first vertex in the batch
    const int * GetStartPtr() const {
        return & _start;
    }


    
    /// Returns the index of the last vertex in the batch
    int GetEnd() const {
        return _end;
    }

    /// Returns the index of the last vertex in the batch
    const int * GetEndPtr() const {
        return & _end;
    }



    /// Returns the edit index (for the hierarchical edit kernels only)
    int GetTableIndex() const {
        return _tableIndex;
    }
    


    /// Returns
    int GetTableOffset() const {
        return _tableOffset;
    }

    /// Returns
    const int * GetTableOffsetPtr() const {
        return & _tableOffset;
    }



    /// Returns
    int GetVertexOffset() const {
        return _vertexOffset;
    }

    /// Returns
    const int * GetVertexOffsetPtr() const {
        return & _vertexOffset;
    }


    /// Returns the mesh index (used in batching)
    int GetMeshIndex() const {
        return _meshIndex;
    }

private:
    friend class FarKernelBatchFactory;
    template <class X, class Y> friend class FarMultiMeshFactory;

    KernelType _kernelType;
    int _level;
    int _tableIndex;
    int _start;
    int _end;
    int _tableOffset;
    int _vertexOffset;
    int _meshIndex;
};

typedef std::vector<FarKernelBatch> FarKernelBatchVector;

} // end namespace OPENSUBDIV_VERSION
using namespace OPENSUBDIV_VERSION;

} // end namespace OpenSubdiv

#endif  /* FAR_KERNEL_BATCH_H */