OpenCV includes OpenGL support. OpenGL is a graphical library that is integrated in graphic cards as a standard. OpenGL allow us to draw from 2D to complex 3D scenes.
OpenCV includes OpenGL support due to the importance of representing 3D spaces in some tasks. To allow a window support in OpenGL, we have to set up the WINDOW_OPENGL flag when we create the window with the namedWindow call.
The following code creates a window with OpenGL support and draws a rotated plane that shows the web camera frames:
Mat frame;
GLfloat angle= 0.0;
GLuint texture;
VideoCapture camera;
int loadTexture() {
if (frame.data==NULL) return -1;
glGenTextures(1, &texture);
glBindTexture( GL_TEXTURE_2D, texture );
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, frame.cols, frame.rows,0, GL_BGR, GL_UNSIGNED_BYTE, frame...
