//
//   Copyright 2013 Pixar
//
//   Licensed under the terms set forth in the LICENSE.txt file available at
//   https://opensubdiv.org/license.
//

#ifndef OPENSUBDIV3_OSD_CL_VERTEX_BUFFER_H
#define OPENSUBDIV3_OSD_CL_VERTEX_BUFFER_H

#include "../version.h"
#include "../osd/opencl.h"

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

namespace Osd {

///
/// \brief Concrete vertex buffer class for OpenCL subdivision.
///
/// CLVertexBuffer implements CLVertexBufferInterface. An instance of this
/// buffer class can be passed to CLEvaluator
///
class CLVertexBuffer {

public:
    /// Creator. Returns NULL if error.
    static CLVertexBuffer * Create(int numElements, int numVertices, cl_context clContext);

    template <typename DEVICE_CONTEXT>
    static CLVertexBuffer * Create(int numElements, int numVertices,
                                   DEVICE_CONTEXT context) {
        return Create(numElements, numVertices, context->GetContext());
    }

    /// Destructor.
    ~CLVertexBuffer();

    /// 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, cl_command_queue clQueue, 
        cl_event* startEvents = NULL, unsigned int numStartEvents = 0, cl_event* endEvent = NULL);

    template<typename DEVICE_CONTEXT>
    void UpdateData(const float *src, int startVertex, int numVertices,
                    DEVICE_CONTEXT context, 
                    cl_event* startEvents = NULL, unsigned int numStartEvents = 0, cl_event* endEvent = NULL) {
        UpdateData(src, startVertex, numVertices, context->GetCommandQueue(), startEvents, numStartEvents, endEvent);
    }

    /// 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 CL memory object.
    cl_mem BindCLBuffer(cl_command_queue queue);

protected:
    /// Constructor.
    CLVertexBuffer(int numElements, int numVertices, cl_context clContext);

    /// Allocates CL memory for this buffer.
    /// Returns true if success.
    bool allocate(cl_context clContext);

private:
    int _numElements;
    int _numVertices;
    cl_mem _clMemory;
};

}  // end namespace Osd

}  // end namespace OPENSUBDIV_VERSION
using namespace OPENSUBDIV_VERSION;

}  // end namespace OpenSubdiv

#endif  // OPENSUBDIV3_OSD_CL_VERTEX_BUFFER_H