OpenGL support

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_OPENGLflag 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, 1); 
 
   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, frame.cols, frame.rows,0, GL_BGR, GL_UNSIGNED_BYTE, frame...