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#ifndef OSD_CPU_D3D11_VERTEX_BUFFER_H
#define OSD_CPU_D3D11_VERTEX_BUFFER_H

#include "../version.h"

struct ID3D11Buffer;
struct ID3D11Device;
struct ID3D11DeviceContext;

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

/// \brief Concrete vertex buffer class for Cpu subvision and DirectX drawing.
/// OsdCpuD3D11VertexBuffer implements OsdCpuVertexBufferInterface and
/// OsdD3D11VertexBufferInterface.
/// An instance of this buffer class can be passed to OsdCpuComputeController.
class OsdCpuD3D11VertexBuffer {
public:
    /// Creator. Returns NULL if error.
    static OsdCpuD3D11VertexBuffer * Create(int numElements, int numVertices,
                                            ID3D11Device *device);

    /// Destructor.
    virtual ~OsdCpuD3D11VertexBuffer();

    /// 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 the address of CPU buffer.
    float * BindCpuBuffer();

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

protected:
    /// Constructor.
    OsdCpuD3D11VertexBuffer(int numElements, int numVertices,
                            ID3D11Device *device);

    bool allocate(ID3D11Device *device);

private:
    int _numElements;
    int _numVertices;
    ID3D11Buffer *_d3d11Buffer;
    float *_cpuBuffer;
};

}  // end namespace OPENSUBDIV_VERSION
using namespace OPENSUBDIV_VERSION;

}  // end namespace OpenSubdiv

#endif  // OSD_CPU_D3D11_VERTEX_BUFFER_H