added OpenGL support to highgui under WIN32

samples/gpu/highgui_gpu.cpp

@@ -0,0 +1,126 @@
+#include <iostream>
+#include <string>
+
+#include "opencv2/core/core.hpp"
+#include "opencv2/core/gpumat.hpp"
+#include "opencv2/gpu/gpu.hpp"
+#include "opencv2/highgui/highgui.hpp"
+#include "opencv2/contrib/contrib.hpp"
+
+using namespace std;
+using namespace cv;
+using namespace cv::gpu;
+
+struct Timer
+{
+    Timer(const string& msg_)
+    {
+        msg = msg_;
+
+        tm.reset();
+        tm.start();
+    }
+
+    ~Timer()
+    {
+        tm.stop();
+        cout << msg << " " << tm.getTimeMilli() << " ms\n";
+    }
+
+    string msg;
+    TickMeter tm;
+};
+
+int main(int argc, char* argv[])
+{
+    if (argc < 2)
+    {
+        cout << "Usage: " << argv[0] << " image" << endl;
+        return -1;
+    }
+
+    try
+    {
+        bool haveCuda = getCudaEnabledDeviceCount() > 0;
+
+        namedWindow("OpenGL Mat", WINDOW_OPENGL | WINDOW_AUTOSIZE);
+        namedWindow("OpenGL GlBuffer", WINDOW_OPENGL | WINDOW_AUTOSIZE);
+        namedWindow("OpenGL GlTexture", WINDOW_OPENGL | WINDOW_AUTOSIZE);
+        if (haveCuda)
+            namedWindow("OpenGL GpuMat", WINDOW_OPENGL | WINDOW_AUTOSIZE);
+        namedWindow("Mat", WINDOW_AUTOSIZE);
+
+        Mat img = imread(argv[1]);
+        
+        if (haveCuda)
+            setGlDevice();
+
+        setOpenGlContext("OpenGL GlBuffer");
+        GlBuffer buf(img, GlBuffer::TEXTURE_BUFFER);
+
+        setOpenGlContext("OpenGL GlTexture");
+        GlTexture tex(img);
+        
+        GpuMat d_img;
+        if (haveCuda)
+            d_img.upload(img);
+
+        cout << "=== First call\n\n";
+
+        {
+            Timer t("OpenGL Mat      ");
+            imshow("OpenGL Mat", img);
+        }
+        {
+            Timer t("OpenGL GlBuffer ");
+            imshow("OpenGL GlBuffer", buf);
+        }
+        {
+            Timer t("OpenGL GlTexture");
+            imshow("OpenGL GlTexture", tex);
+        }
+        if (haveCuda)
+        {
+            Timer t("OpenGL GpuMat   ");
+            imshow("OpenGL GpuMat", d_img);
+        }
+        {
+            Timer t("Mat             ");
+            imshow("Mat", img);
+        }
+
+        cout << "\n=== Second call\n\n";   
+
+        {
+            Timer t("OpenGL Mat      ");
+            imshow("OpenGL Mat", img);
+        }
+        {
+            Timer t("OpenGL GlBuffer ");
+            imshow("OpenGL GlBuffer", buf);
+        }
+        {
+            Timer t("OpenGL GlTexture");
+            imshow("OpenGL GlTexture", tex);
+        }
+        if (haveCuda)
+        {
+            Timer t("OpenGL GpuMat   ");
+            imshow("OpenGL GpuMat", d_img);
+        }
+        {
+            Timer t("Mat             ");
+            imshow("Mat", img);
+        }
+
+        cout << "\n";
+
+        waitKey();
+    }
+    catch(const exception& e)
+    {
+        cout << e.what() << endl;
+    }
+
+    return 0;
+}