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#ifndef OSD_D3D11_COMPUTE_CONTROLLER_H
#define OSD_D3D11_COMPUTE_CONTROLLER_H

#include "../version.h"

#include "../osd/d3d11ComputeContext.h"
#include "../osd/d3d11Dispatcher.h"

#include <vector>

struct ID3D11DeviceContext;
struct ID3D11Query;

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

class OsdD3D11ComputeKernelBundle;

/// \brief Compute controller for launching D3D11Compute transform feedback
/// subdivision kernels.
/// OsdD3D11ComputeController is a compute controller class to launch
/// D3D11Compute transfrom feedback subdivision kernels. It requires
/// OsdD3D11VertexBufferInterface as arguments of Refine function.
class OsdD3D11ComputeController {
public:
    typedef OsdD3D11ComputeContext ComputeContext;

    /// Constructor.
    OsdD3D11ComputeController(ID3D11DeviceContext *deviceContext);

    /// Destructor.
    ~OsdD3D11ComputeController();

    /// Launch subdivision kernels and apply to given vertex buffers.
    /// vertexBuffer will be interpolated with vertex interpolation and
    /// varyingBuffer will be interpolated with varying interpolation.
    /// vertexBuffer and varyingBuffer should implement
    /// OsdD3D11VertexBufferInterface.
    template<class VERTEX_BUFFER, class VARYING_BUFFER>
    void Refine(OsdD3D11ComputeContext *context,
                VERTEX_BUFFER *vertexBuffer,
                VARYING_BUFFER *varyingBuffer) {

        int numVertexElements = vertexBuffer ? vertexBuffer->GetNumElements() : 0;
        int numVaryingElements = varyingBuffer ? varyingBuffer->GetNumElements() : 0;

        context->SetKernelBundle(getKernels(numVertexElements, numVaryingElements));
        context->Bind(vertexBuffer, varyingBuffer);
        OsdD3D11ComputeKernelDispatcher::GetInstance()->Refine(context->GetFarMesh(), context);
        context->Unbind();
    }

    template<class VERTEX_BUFFER>
    void Refine(OsdD3D11ComputeContext *context, VERTEX_BUFFER *vertexBuffer) {
        Refine(context, vertexBuffer, (VERTEX_BUFFER*)NULL);
    }

    /// Waits until all running subdivision kernels finish.
    void Synchronize();

private:
    OsdD3D11ComputeKernelBundle * getKernels(int numVertexElements,
                                             int numVaryingElements);

    ID3D11DeviceContext *_deviceContext;
    ID3D11Query *_query;
    std::vector<OsdD3D11ComputeKernelBundle *> _kernelRegistry;
};

}  // end namespace OPENSUBDIV_VERSION
using namespace OPENSUBDIV_VERSION;

}  // end namespace OpenSubdiv

#endif  // OSD_D3D11_COMPUTE_CONTROLLER_H