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//  copy or use the software.
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//
//                           License Agreement
//                For Open Source Computer Vision Library
//
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#include "precomp.hpp"

using namespace cv;
using namespace cv::gpu;

////////////////////////////////////////////////////////////////
// Stream

#ifndef HAVE_CUDA

class cv::gpu::Stream::Impl
{
public:
    Impl(void* ptr = 0)
    {
        (void) ptr;
        throw_no_cuda();
    }
};

#else

class cv::gpu::Stream::Impl
{
public:
    cudaStream_t stream;

    Impl();
    Impl(cudaStream_t stream);

    ~Impl();
};

cv::gpu::Stream::Impl::Impl() : stream(0)
{
    cudaSafeCall( cudaStreamCreate(&stream) );
}

cv::gpu::Stream::Impl::Impl(cudaStream_t stream_) : stream(stream_)
{
}

cv::gpu::Stream::Impl::~Impl()
{
    if (stream)
        cudaStreamDestroy(stream);
}

cudaStream_t cv::gpu::StreamAccessor::getStream(const Stream& stream)
{
    return stream.impl_->stream;
}

#endif

cv::gpu::Stream::Stream()
{
#ifndef HAVE_CUDA
    throw_no_cuda();
#else
    impl_ = new Impl;
#endif
}

bool cv::gpu::Stream::queryIfComplete() const
{
#ifndef HAVE_CUDA
    throw_no_cuda();
    return false;
#else
    cudaError_t err = cudaStreamQuery(impl_->stream);

    if (err == cudaErrorNotReady || err == cudaSuccess)
        return err == cudaSuccess;

    cudaSafeCall(err);
    return false;
#endif
}

void cv::gpu::Stream::waitForCompletion()
{
#ifndef HAVE_CUDA
    throw_no_cuda();
#else
    cudaSafeCall( cudaStreamSynchronize(impl_->stream) );
#endif
}

void cv::gpu::Stream::waitEvent(const Event& event)
{
#ifndef HAVE_CUDA
    (void) event;
    throw_no_cuda();
#else
    cudaSafeCall( cudaStreamWaitEvent(impl_->stream, EventAccessor::getEvent(event), 0) );
#endif
}

#if defined(HAVE_CUDA) && (CUDART_VERSION >= 5000)

namespace
{
    struct CallbackData
    {
        Stream::StreamCallback callback;
        void* userData;

        CallbackData(Stream::StreamCallback callback_, void* userData_) : callback(callback_), userData(userData_) {}
    };

    void CUDART_CB cudaStreamCallback(cudaStream_t, cudaError_t status, void* userData)
    {
        CallbackData* data = reinterpret_cast<CallbackData*>(userData);
        data->callback(static_cast<int>(status), data->userData);
        delete data;
    }
}

#endif

void cv::gpu::Stream::enqueueHostCallback(StreamCallback callback, void* userData)
{
#ifndef HAVE_CUDA
    (void) callback;
    (void) userData;
    throw_no_cuda();
#else
    #if CUDART_VERSION < 5000
        (void) callback;
        (void) userData;
        CV_Error(cv::Error::StsNotImplemented, "This function requires CUDA 5.0");
    #else
        CallbackData* data = new CallbackData(callback, userData);

        cudaSafeCall( cudaStreamAddCallback(impl_->stream, cudaStreamCallback, data, 0) );
    #endif
#endif
}

Stream& cv::gpu::Stream::Null()
{
    static Stream s(new Impl(0));
    return s;
}

cv::gpu::Stream::operator bool_type() const
{
#ifndef HAVE_CUDA
    return 0;
#else
    return (impl_->stream != 0) ? &Stream::this_type_does_not_support_comparisons : 0;
#endif
}

template <> void cv::Ptr<Stream::Impl>::delete_obj()
{
    if (obj) delete obj;
}

////////////////////////////////////////////////////////////////
// Stream

#ifndef HAVE_CUDA

class cv::gpu::Event::Impl
{
public:
    Impl(unsigned int)
    {
        throw_no_cuda();
    }
};

#else

class cv::gpu::Event::Impl
{
public:
    cudaEvent_t event;

    Impl(unsigned int flags);
    ~Impl();
};

cv::gpu::Event::Impl::Impl(unsigned int flags) : event(0)
{
    cudaSafeCall( cudaEventCreateWithFlags(&event, flags) );
}

cv::gpu::Event::Impl::~Impl()
{
    if (event)
        cudaEventDestroy(event);
}

cudaEvent_t cv::gpu::EventAccessor::getEvent(const Event& event)
{
    return event.impl_->event;
}

#endif

cv::gpu::Event::Event(CreateFlags flags)
{
#ifndef HAVE_CUDA
    (void) flags;
    throw_no_cuda();
#else
    impl_ = new Impl(flags);
#endif
}

void cv::gpu::Event::record(Stream& stream)
{
#ifndef HAVE_CUDA
    (void) stream;
    throw_no_cuda();
#else
    cudaSafeCall( cudaEventRecord(impl_->event, StreamAccessor::getStream(stream)) );
#endif
}

bool cv::gpu::Event::queryIfComplete() const
{
#ifndef HAVE_CUDA
    throw_no_cuda();
    return false;
#else
    cudaError_t err = cudaEventQuery(impl_->event);

    if (err == cudaErrorNotReady || err == cudaSuccess)
        return err == cudaSuccess;

    cudaSafeCall(err);
    return false;
#endif
}

void cv::gpu::Event::waitForCompletion()
{
#ifndef HAVE_CUDA
    throw_no_cuda();
#else
    cudaSafeCall( cudaEventSynchronize(impl_->event) );
#endif
}

float cv::gpu::Event::elapsedTime(const Event& start, const Event& end)
{
#ifndef HAVE_CUDA
    (void) start;
    (void) end;
    throw_no_cuda();
    return 0.0f;
#else
    float ms;
    cudaSafeCall( cudaEventElapsedTime(&ms, start.impl_->event, end.impl_->event) );
    return ms;
#endif
}

template <> void cv::Ptr<Event::Impl>::delete_obj()
{
    if (obj) delete obj;
}