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#ifndef OSD_CUDA_D3D11_VERTEX_BUFFER_H
#define OSD_CUDA_D3D11_VERTEX_BUFFER_H

#include "../version.h"

struct cudaGraphicsResource;

struct ID3D11Buffer;
struct ID3D11Device;
struct ID3D11DeviceContext;

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

/// \brief Concrete vertex buffer class for cuda subvision and D3D11 drawing.
///
/// OsdCudaD3D11VertexBuffer implements OsdCudaVertexBufferInterface and
/// OsdD3D11VertexBufferInterface.
///
/// The buffer interop between Cuda and D3D is handled automatically when a 
/// client calls BindCudaBuffer and BindVBO methods.
///
class OsdCudaD3D11VertexBuffer {
public:
    /// Creator. Returns NULL if error.
    static OsdCudaD3D11VertexBuffer * Create(int numElements, 
                                             int numVertices, 
                                             ID3D11Device *device);

    /// Destructor.
    virtual ~OsdCudaD3D11VertexBuffer();

    /// This method is meant to be used in client code in order to provide coarse
    /// vertices data to Osd.
    void UpdateData(const float *src, int startVertex, int numVertices, void *param);

    /// Returns how many elements defined in this vertex buffer.
    int GetNumElements() const;

    /// Returns how many vertices allocated in this vertex buffer.
    int GetNumVertices() const;

    /// Returns cuda memory. DX buffer will be mapped to cuda resource
    /// if necessary.
    float * BindCudaBuffer();

    /// Returns the D3D11 buffer object.
    ID3D11Buffer *BindD3D11Buffer(ID3D11DeviceContext *deviceContext);

protected:
    /// Constructor.
    OsdCudaD3D11VertexBuffer(int numElements, 
                             int numVertices,
                             ID3D11Device *device);

    bool allocate(ID3D11Device *device);

    // Acqures a cuda resource from DX11
    void map();

    // Releases a cuda resource to DX11
    void unmap();

private:
    int _numElements;
    int _numVertices;
    ID3D11Buffer *_d3d11Buffer;
    void *_cudaBuffer;
    cudaGraphicsResource *_cudaResource;
};

}  // end namespace OPENSUBDIV_VERSION
using namespace OPENSUBDIV_VERSION;

}  // end namespace OpenSubdiv

#endif  // OSD_CUDA_D3D11_VERTEX_BUFFER_H