OpenSubdiv/opensubdiv/osd/ompComputeController.h

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#ifndef OSD_OMP_COMPUTE_CONTROLLER_H
#define OSD_OMP_COMPUTE_CONTROLLER_H

#include "../version.h"

#include "../osd/cpuComputeContext.h"
#include "../osd/ompDispatcher.h"

#ifdef OPENSUBDIV_HAS_OPENMP
    #include <omp.h>
#endif

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

/// \brief Compute controller for launching OpenMP subdivision kernels.
/// OsdOmpComputeController is a compute controller class to launch
/// OpenMP threaded subdivision kernels. It requires OsdCpuVertexBufferInterface
/// as arguments of Refine function.
class OsdOmpComputeController {
public:
    typedef OsdCpuComputeContext ComputeContext;

    /// Constructor.
    /// numThreads specifies how many threads to be used in openmp parallel
    /// execution. numThreads=-1 means to use available number of processors.
    explicit OsdOmpComputeController(int numThreads=-1);

    /// 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 
    /// OsdCpuVertexBufferInterface.
    template<class VERTEX_BUFFER, class VARYING_BUFFER>
    void Refine(OsdCpuComputeContext *context,
                VERTEX_BUFFER *vertexBuffer,
                VARYING_BUFFER *varyingBuffer) {

        omp_set_num_threads(_numThreads);

        context->Bind(vertexBuffer, varyingBuffer);
        OsdOmpKernelDispatcher::GetInstance()->Refine(context->GetFarMesh(),
                                                      context);
        context->Unbind();
    }

    template<class VERTEX_BUFFER>
    void Refine(OsdCpuComputeContext *context, VERTEX_BUFFER *vertexBuffer) {
        Refine(context, vertexBuffer, (VERTEX_BUFFER*)0);
    }

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

private:
    int _numThreads;
};

}  // end namespace OPENSUBDIV_VERSION
using namespace OPENSUBDIV_VERSION;

}  // end namespace OpenSubdiv

#endif  // OSD_OMP_COMPUTE_CONTROLLER_H