OpenCV includes OpenGL support. OpenGL is a graphical library integrated in almost all graphical cards as a standard. OpenGL allows us to draw 2D up to complex 3D scenes. OpenCV includes OpenGL support due to the importance of representing 3D spaces in a number of tasks. To allow window support in OpenGL, we have to set up the WINDOW_OPENGL flag when we create the window using the namedWindow call.
The following code creates a window with OpenGL support and draws a rotate plane where we are going to show the web camera frames:
Mat frame;
GLfloat angle= 0.0;
GLuint texture;
VideoCapture camera;
int loadTexture() {
if (frame.data==NULL) return -1;
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...