sycl-opencv-interop.cpp
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/*
* The example of interoperability between SYCL/OpenCL and OpenCV.
* - SYCL: https://www.khronos.org/sycl/
* - SYCL runtime parameters: https://github.com/intel/llvm/blob/sycl/sycl/doc/EnvironmentVariables.md
*/
#include <CL/sycl.hpp>
#include <opencv2/core.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/videoio.hpp>
#include <opencv2/imgproc.hpp>
#include <opencv2/core/ocl.hpp>
class sycl_inverse_kernel; // can be omitted - modern SYCL versions doesn't require this
using namespace cv;
class App
{
public:
App(const CommandLineParser& cmd);
~App();
void initVideoSource();
void initSYCL();
void process_frame(cv::Mat& frame);
/// to check result with CPU-only reference code
Mat process_frame_reference(const cv::Mat& frame);
int run();
bool isRunning() { return m_running; }
bool doProcess() { return m_process; }
void setRunning(bool running) { m_running = running; }
void setDoProcess(bool process) { m_process = process; }
protected:
void handleKey(char key);
private:
bool m_running;
bool m_process;
bool m_show_ui;
int64 m_t0;
int64 m_t1;
float m_time;
float m_frequency;
std::string m_file_name;
int m_camera_id;
cv::VideoCapture m_cap;
cv::Mat m_frame;
cl::sycl::queue sycl_queue;
};
App::App(const CommandLineParser& cmd)
{
m_camera_id = cmd.get<int>("camera");
m_file_name = cmd.get<std::string>("video");
m_running = false;
m_process = false;
} // ctor
App::~App()
{
// nothing
}
void App::initSYCL()
{
using namespace cl::sycl;
// Configuration details: https://github.com/intel/llvm/blob/sycl/sycl/doc/EnvironmentVariables.md
cl::sycl::default_selector selector;
sycl_queue = cl::sycl::queue(selector, [](cl::sycl::exception_list l)
{
// exception_handler
for (auto ep : l)
{
try
{
std::rethrow_exception(ep);
}
catch (const cl::sycl::exception& e)
{
std::cerr << "SYCL exception: " << e.what() << std::endl;
}
}
});
auto device = sycl_queue.get_device();
auto platform = device.get_platform();
std::cout << "SYCL device: " << device.get_info<info::device::name>()
<< " @ " << device.get_info<info::device::driver_version>()
<< " (platform: " << platform.get_info<info::platform::name>() << ")" << std::endl;
if (device.is_host())
{
std::cerr << "SYCL can't select OpenCL device. Host is used for computations, interoperability is not available" << std::endl;
}
else
{
// bind OpenCL context/device/queue from SYCL to OpenCV
try
{
auto ctx = cv::ocl::OpenCLExecutionContext::create(
platform.get_info<info::platform::name>(),
platform.get(),
sycl_queue.get_context().get(),
device.get()
);
ctx.bind();
}
catch (const cv::Exception& e)
{
std::cerr << "OpenCV: Can't bind SYCL OpenCL context/device/queue: " << e.what() << std::endl;
}
std::cout << "OpenCV uses OpenCL: " << (cv::ocl::useOpenCL() ? "True" : "False") << std::endl;
}
} // initSYCL()
void App::initVideoSource()
{
if (!m_file_name.empty() && m_camera_id == -1)
{
m_cap.open(samples::findFileOrKeep(m_file_name));
if (!m_cap.isOpened())
throw std::runtime_error(std::string("can't open video stream: ") + m_file_name);
}
else if (m_camera_id != -1)
{
m_cap.open(m_camera_id);
if (!m_cap.isOpened())
throw std::runtime_error(std::string("can't open camera: ") + std::to_string(m_camera_id));
}
else
throw std::runtime_error(std::string("specify video source"));
} // initVideoSource()
void App::process_frame(cv::Mat& frame)
{
using namespace cl::sycl;
// cv::Mat => cl::sycl::buffer
{
CV_Assert(frame.isContinuous());
CV_CheckTypeEQ(frame.type(), CV_8UC1, "");
buffer<uint8_t, 2> frame_buffer(frame.data, range<2>(frame.rows, frame.cols));
// done automatically: frame_buffer.set_write_back(true);
sycl_queue.submit([&](handler& cgh) {
auto pixels = frame_buffer.get_access<access::mode::read_write>(cgh);
cgh.parallel_for<class sycl_inverse_kernel>(range<2>(frame.rows, frame.cols), [=](item<2> item) {
uint8_t v = pixels[item];
pixels[item] = ~v;
});
});
sycl_queue.wait_and_throw();
}
// No way to extract cl_mem from cl::sycl::buffer (ref: 3.6.11 "Interfacing with OpenCL" of SYCL 1.2.1)
// We just reusing OpenCL context/device/queue from SYCL here (see initSYCL() bind part) and call UMat processing
{
UMat blurResult;
{
UMat umat_buffer = frame.getUMat(ACCESS_RW);
cv::blur(umat_buffer, blurResult, Size(3, 3)); // UMat doesn't support inplace
}
Mat result;
blurResult.copyTo(result);
swap(result, frame);
}
}
Mat App::process_frame_reference(const cv::Mat& frame)
{
Mat result;
cv::bitwise_not(frame, result);
Mat blurResult;
cv::blur(result, blurResult, Size(3, 3)); // avoid inplace
blurResult.copyTo(result);
return result;
}
int App::run()
{
std::cout << "Initializing..." << std::endl;
initSYCL();
initVideoSource();
std::cout << "Press ESC to exit" << std::endl;
std::cout << " 'p' to toggle ON/OFF processing" << std::endl;
m_running = true;
m_process = true;
m_show_ui = true;
int processedFrames = 0;
cv::TickMeter timer;
// Iterate over all frames
while (isRunning() && m_cap.read(m_frame))
{
Mat m_frameGray;
cvtColor(m_frame, m_frameGray, COLOR_BGR2GRAY);
bool checkWithReference = (processedFrames == 0);
Mat reference_result;
if (checkWithReference)
{
reference_result = process_frame_reference(m_frameGray);
}
timer.reset();
timer.start();
if (m_process)
{
process_frame(m_frameGray);
}
timer.stop();
if (checkWithReference)
{
double diffInf = cv::norm(reference_result, m_frameGray, NORM_INF);
if (diffInf > 0)
{
std::cerr << "Result is not accurate. diffInf=" << diffInf << std::endl;
imwrite("reference.png", reference_result);
imwrite("actual.png", m_frameGray);
}
}
Mat img_to_show = m_frameGray;
std::ostringstream msg;
msg << "Frame " << processedFrames << " (" << m_frame.size
<< ") Time: " << cv::format("%.2f", timer.getTimeMilli()) << " msec"
<< " (process: " << (m_process ? "True" : "False") << ")";
std::cout << msg.str() << std::endl;
putText(img_to_show, msg.str(), Point(5, 150), FONT_HERSHEY_SIMPLEX, 1., Scalar(255, 100, 0), 2);
if (m_show_ui)
{
try
{
imshow("sycl_interop", img_to_show);
int key = waitKey(1);
switch (key)
{
case 27: // ESC
m_running = false;
break;
case 'p': // fallthru
case 'P':
m_process = !m_process;
break;
default:
break;
}
}
catch (const std::exception& e)
{
std::cerr << "ERROR(OpenCV UI): " << e.what() << std::endl;
if (processedFrames > 0)
throw;
m_show_ui = false; // UI is not available
}
}
processedFrames++;
if (!m_show_ui)
{
if (processedFrames > 100)
m_running = false;
}
}
return 0;
}
int main(int argc, char** argv)
{
const char* keys =
"{ help h ? | | print help message }"
"{ camera c | -1 | use camera as input }"
"{ video v | | use video as input }";
CommandLineParser cmd(argc, argv, keys);
if (cmd.has("help"))
{
cmd.printMessage();
return EXIT_SUCCESS;
}
try
{
App app(cmd);
if (!cmd.check())
{
cmd.printErrors();
return 1;
}
app.run();
}
catch (const cv::Exception& e)
{
std::cout << "FATAL: OpenCV error: " << e.what() << std::endl;
return 1;
}
catch (const std::exception& e)
{
std::cout << "FATAL: C++ error: " << e.what() << std::endl;
return 1;
}
catch (...)
{
std::cout << "FATAL: unknown C++ exception" << std::endl;
return 1;
}
return EXIT_SUCCESS;
} // main()