mirror of
https://github.com/opencv/opencv.git
synced 2024-11-24 11:10:21 +08:00
551 lines
14 KiB
C++
551 lines
14 KiB
C++
/*
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// Sample demonstrating interoperability of OpenCV UMat with OpenGL texture.
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// At first, the data obtained from video file or camera and placed onto
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// OpenGL texture, following mapping of this OpenGL texture to OpenCV UMat
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// and call cv::Blur function. The result is mapped back to OpenGL texture
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// and rendered through OpenGL API.
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*/
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#if defined(_WIN32)
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# define WIN32_LEAN_AND_MEAN
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# include <windows.h>
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#elif defined(__linux__)
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# include <X11/X.h>
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# include <X11/Xlib.h>
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#endif
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#include <iostream>
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#include <queue>
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#include <string>
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#include <stdio.h>
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#include "opencv2/core.hpp"
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#include "opencv2/core/opengl.hpp"
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#include "opencv2/core/ocl.hpp"
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#include "opencv2/imgproc.hpp"
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#include "opencv2/videoio.hpp"
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#include "winapp.hpp"
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#if defined(_WIN32)
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# pragma comment(lib, "opengl32.lib")
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# pragma comment(lib, "glu32.lib")
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#endif
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/*
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// Press key to
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// 1 processing on CPU
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// 2 processing on GPU
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// 9 toggle texture/buffer
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// space toggle processing on/off, preserve mode
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// esc quit
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*/
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class GLWinApp : public WinApp
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{
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public:
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enum MODE
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{
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MODE_CPU = 0,
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MODE_GPU
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};
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GLWinApp(int width, int height, std::string& window_name, cv::VideoCapture& cap) :
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WinApp(width, height, window_name)
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{
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m_shutdown = false;
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m_use_buffer = false;
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m_demo_processing = true;
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m_mode = MODE_CPU;
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m_modeStr[0] = cv::String("Processing on CPU");
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m_modeStr[1] = cv::String("Processing on GPU");
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m_cap = cap;
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}
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~GLWinApp() {}
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virtual void cleanup()
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{
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m_shutdown = true;
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#if defined(__linux__)
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glXMakeCurrent(m_display, None, NULL);
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glXDestroyContext(m_display, m_glctx);
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#endif
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WinApp::cleanup();
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}
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#if defined(_WIN32)
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virtual LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
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{
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switch (message)
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{
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case WM_CHAR:
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if (wParam == '1')
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{
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set_mode(MODE_CPU);
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return 0;
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}
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if (wParam == '2')
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{
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set_mode(MODE_GPU);
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return 0;
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}
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else if (wParam == '9')
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{
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toggle_buffer();
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return 0;
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}
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else if (wParam == VK_SPACE)
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{
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m_demo_processing = !m_demo_processing;
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return 0;
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}
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else if (wParam == VK_ESCAPE)
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{
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cleanup();
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return 0;
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}
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break;
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case WM_CLOSE:
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cleanup();
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return 0;
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case WM_DESTROY:
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::PostQuitMessage(0);
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return 0;
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}
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return ::DefWindowProc(hWnd, message, wParam, lParam);
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}
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#endif
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#if defined(__linux__)
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int handle_event(XEvent& e)
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{
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switch(e.type)
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{
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case ClientMessage:
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if ((Atom)e.xclient.data.l[0] == m_WM_DELETE_WINDOW)
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{
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m_end_loop = true;
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cleanup();
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}
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else
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{
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return 0;
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}
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break;
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case Expose:
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render();
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break;
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case KeyPress:
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switch(keycode_to_keysym(e.xkey.keycode))
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{
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case XK_space:
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m_demo_processing = !m_demo_processing;
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break;
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case XK_1:
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set_mode(MODE_CPU);
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break;
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case XK_2:
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set_mode(MODE_GPU);
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break;
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case XK_9:
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toggle_buffer();
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break;
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case XK_Escape:
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m_end_loop = true;
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cleanup();
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break;
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}
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break;
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default:
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return 0;
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}
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return 1;
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}
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#endif
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int init()
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{
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#if defined(_WIN32)
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m_hDC = GetDC(m_hWnd);
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if (setup_pixel_format() != 0)
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{
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std::cerr << "Can't setup pixel format" << std::endl;
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return -1;
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}
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m_hRC = wglCreateContext(m_hDC);
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wglMakeCurrent(m_hDC, m_hRC);
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#elif defined(__linux__)
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m_glctx = glXCreateContext(m_display, m_visual_info, NULL, GL_TRUE);
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glXMakeCurrent(m_display, m_window, m_glctx);
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#endif
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glEnable(GL_TEXTURE_2D);
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glEnable(GL_DEPTH_TEST);
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glViewport(0, 0, m_width, m_height);
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if (cv::ocl::haveOpenCL())
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{
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(void) cv::ogl::ocl::initializeContextFromGL();
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}
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m_oclDevName = cv::ocl::useOpenCL() ?
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cv::ocl::Context::getDefault().device(0).name() :
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(char*) "No OpenCL device";
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return 0;
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} // init()
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int get_frame(cv::ogl::Texture2D& texture, cv::ogl::Buffer& buffer, bool do_buffer)
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{
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if (!m_cap.read(m_frame_bgr))
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return -1;
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cv::cvtColor(m_frame_bgr, m_frame_rgba, CV_RGB2RGBA);
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if (do_buffer)
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buffer.copyFrom(m_frame_rgba, cv::ogl::Buffer::PIXEL_UNPACK_BUFFER, true);
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else
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texture.copyFrom(m_frame_rgba, true);
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return 0;
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}
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void print_info(MODE mode, float time, cv::String& oclDevName)
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{
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#if defined(_WIN32)
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HDC hDC = m_hDC;
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HFONT hFont = (HFONT)::GetStockObject(SYSTEM_FONT);
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HFONT hOldFont = (HFONT)::SelectObject(hDC, hFont);
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if (hOldFont)
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{
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TEXTMETRIC tm;
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::GetTextMetrics(hDC, &tm);
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char buf[256+1];
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int y = 0;
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buf[0] = 0;
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sprintf_s(buf, sizeof(buf)-1, "Mode: %s OpenGL %s", m_modeStr[mode].c_str(), use_buffer() ? "buffer" : "texture");
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::TextOut(hDC, 0, y, buf, (int)strlen(buf));
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y += tm.tmHeight;
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buf[0] = 0;
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sprintf_s(buf, sizeof(buf)-1, "Time, msec: %2.1f", time);
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::TextOut(hDC, 0, y, buf, (int)strlen(buf));
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y += tm.tmHeight;
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buf[0] = 0;
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sprintf_s(buf, sizeof(buf)-1, "OpenCL device: %s", oclDevName.c_str());
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::TextOut(hDC, 0, y, buf, (int)strlen(buf));
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::SelectObject(hDC, hOldFont);
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}
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#elif defined(__linux__)
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char buf[256+1];
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snprintf(buf, sizeof(buf)-1, "Time, msec: %2.1f, Mode: %s OpenGL %s, Device: %s", time, m_modeStr[mode].c_str(), use_buffer() ? "buffer" : "texture", oclDevName.c_str());
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XStoreName(m_display, m_window, buf);
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#endif
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}
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void idle()
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{
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render();
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}
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int render()
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{
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try
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{
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if (m_shutdown)
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return 0;
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int r;
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cv::ogl::Texture2D texture;
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cv::ogl::Buffer buffer;
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texture.setAutoRelease(true);
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buffer.setAutoRelease(true);
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MODE mode = get_mode();
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bool do_buffer = use_buffer();
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r = get_frame(texture, buffer, do_buffer);
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if (r != 0)
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{
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return -1;
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}
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switch (mode)
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{
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case MODE_CPU: // process frame on CPU
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processFrameCPU(texture, buffer, do_buffer);
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break;
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case MODE_GPU: // process frame on GPU
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processFrameGPU(texture, buffer, do_buffer);
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break;
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} // switch
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if (do_buffer) // buffer -> texture
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{
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cv::Mat m(m_height, m_width, CV_8UC4);
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buffer.copyTo(m);
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texture.copyFrom(m, true);
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}
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#if defined(__linux__)
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XWindowAttributes window_attributes;
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XGetWindowAttributes(m_display, m_window, &window_attributes);
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glViewport(0, 0, window_attributes.width, window_attributes.height);
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#endif
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glLoadIdentity();
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glEnable(GL_TEXTURE_2D);
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texture.bind();
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glBegin(GL_QUADS);
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glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, 1.0f, 0.1f);
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glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, -1.0f, 0.1f);
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glTexCoord2f(1.0f, 1.0f); glVertex3f(1.0f, -1.0f, 0.1f);
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glTexCoord2f(1.0f, 0.0f); glVertex3f(1.0f, 1.0f, 0.1f);
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glEnd();
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#if defined(_WIN32)
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SwapBuffers(m_hDC);
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#elif defined(__linux__)
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glXSwapBuffers(m_display, m_window);
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#endif
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print_info(mode, m_timer.time(Timer::MSEC), m_oclDevName);
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}
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catch (cv::Exception& e)
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{
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std::cerr << "Exception: " << e.what() << std::endl;
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return 10;
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}
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return 0;
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}
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protected:
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void processFrameCPU(cv::ogl::Texture2D& texture, cv::ogl::Buffer& buffer, bool do_buffer)
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{
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cv::Mat m(m_height, m_width, CV_8UC4);
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m_timer.start();
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if (do_buffer)
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buffer.copyTo(m);
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else
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texture.copyTo(m);
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if (m_demo_processing)
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{
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// blur texture image with OpenCV on CPU
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cv::blur(m, m, cv::Size(15, 15), cv::Point(-7, -7));
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}
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if (do_buffer)
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buffer.copyFrom(m, cv::ogl::Buffer::PIXEL_UNPACK_BUFFER, true);
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else
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texture.copyFrom(m, true);
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m_timer.stop();
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}
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void processFrameGPU(cv::ogl::Texture2D& texture, cv::ogl::Buffer& buffer, bool do_buffer)
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{
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cv::UMat u;
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m_timer.start();
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if (do_buffer)
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u = cv::ogl::mapGLBuffer(buffer);
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else
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cv::ogl::convertFromGLTexture2D(texture, u);
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if (m_demo_processing)
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{
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// blur texture image with OpenCV on GPU with OpenCL
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cv::blur(u, u, cv::Size(15, 15), cv::Point(-7, -7));
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}
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if (do_buffer)
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cv::ogl::unmapGLBuffer(u);
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else
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cv::ogl::convertToGLTexture2D(u, texture);
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m_timer.stop();
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}
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#if defined(_WIN32)
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int setup_pixel_format()
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{
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PIXELFORMATDESCRIPTOR pfd;
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pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
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pfd.nVersion = 1;
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pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
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pfd.iPixelType = PFD_TYPE_RGBA;
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pfd.cColorBits = 24;
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pfd.cRedBits = 8;
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pfd.cRedShift = 0;
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pfd.cGreenBits = 8;
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pfd.cGreenShift = 0;
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pfd.cBlueBits = 8;
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pfd.cBlueShift = 0;
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pfd.cAlphaBits = 8;
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pfd.cAlphaShift = 0;
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pfd.cAccumBits = 0;
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pfd.cAccumRedBits = 0;
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pfd.cAccumGreenBits = 0;
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pfd.cAccumBlueBits = 0;
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pfd.cAccumAlphaBits = 0;
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pfd.cDepthBits = 24;
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pfd.cStencilBits = 8;
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pfd.cAuxBuffers = 0;
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pfd.iLayerType = PFD_MAIN_PLANE;
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pfd.bReserved = 0;
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pfd.dwLayerMask = 0;
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pfd.dwVisibleMask = 0;
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pfd.dwDamageMask = 0;
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int pfmt = ChoosePixelFormat(m_hDC, &pfd);
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if (pfmt == 0)
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return -1;
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if (SetPixelFormat(m_hDC, pfmt, &pfd) == 0)
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return -2;
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return 0;
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}
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#endif
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#if defined(__linux__)
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KeySym keycode_to_keysym(unsigned keycode)
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{ // note that XKeycodeToKeysym() is considered deprecated
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int keysyms_per_keycode_return = 0;
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KeySym *keysyms = XGetKeyboardMapping(m_display, keycode, 1, &keysyms_per_keycode_return);
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KeySym keysym = keysyms[0];
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XFree(keysyms);
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return keysym;
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}
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#endif
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bool use_buffer() { return m_use_buffer; }
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void toggle_buffer() { m_use_buffer = !m_use_buffer; }
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MODE get_mode() { return m_mode; }
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void set_mode(MODE mode) { m_mode = mode; }
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private:
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bool m_shutdown;
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bool m_use_buffer;
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bool m_demo_processing;
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MODE m_mode;
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cv::String m_modeStr[2];
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#if defined(_WIN32)
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HDC m_hDC;
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HGLRC m_hRC;
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#elif defined(__linux__)
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GLXContext m_glctx;
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#endif
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cv::VideoCapture m_cap;
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cv::Mat m_frame_bgr;
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cv::Mat m_frame_rgba;
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cv::String m_oclDevName;
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};
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static void help()
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{
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printf(
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"\nSample demonstrating interoperability of OpenGL and OpenCL with OpenCV.\n"
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"Hot keys: \n"
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" SPACE - turn processing on/off\n"
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" 1 - process GL data through OpenCV on CPU\n"
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" 2 - process GL data through OpenCV on GPU (via OpenCL)\n"
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" 9 - toggle use of GL texture/GL buffer\n"
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" ESC - exit\n\n");
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}
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static const char* keys =
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{
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"{c camera | true | use camera or not}"
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"{f file | | movie file name }"
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"{h help | false | print help info }"
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};
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using namespace cv;
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using namespace std;
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int main(int argc, char** argv)
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{
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cv::CommandLineParser parser(argc, argv, keys);
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bool useCamera = parser.get<bool>("camera");
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string file = parser.get<string>("file");
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bool showHelp = parser.get<bool>("help");
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if (showHelp)
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{
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help();
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return 0;
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}
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parser.printMessage();
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cv::VideoCapture cap;
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if (useCamera)
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cap.open(0);
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else
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cap.open(file.c_str());
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if (!cap.isOpened())
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{
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printf("can not open camera or video file\n");
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return -1;
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}
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int width = (int)cap.get(CAP_PROP_FRAME_WIDTH);
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int height = (int)cap.get(CAP_PROP_FRAME_HEIGHT);
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#if defined(_WIN32)
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string wndname = "WGL Window";
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#elif defined(__linux__)
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string wndname = "GLX Window";
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#endif
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GLWinApp app(width, height, wndname, cap);
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try
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{
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app.create();
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return app.run();
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}
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catch (cv::Exception& e)
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{
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cerr << "Exception: " << e.what() << endl;
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return 10;
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}
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catch (...)
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{
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cerr << "FATAL ERROR: Unknown exception" << endl;
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return 11;
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}
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}
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