GLEW

• The OpenGL Extension Wrangler Library.
• All of the extensions are included into a single library.
  • Extensions can be provided to extend OpenGL's functionality.
  • There are a bunch of these.
• The ones we really care about here are
  • GLX: OpenGL Extension for X
  • WGL: Window's OpenGL Interface
  • CGL: Apple's Macintosh interface.
• These take care of interfacing with the native OS/Windowing environment
  • Get a mouse click from X11/Windows/MACOS and give it to the OpenGL interface
  • Create window, size windows, .....
  • This is a layer below GLUT
• GLEW takes care of all of the details of include files and linking.
• The components.
  • #include <GL/glew.h>
  • You need to include glut if you will use it but nothing else.
  • You need to create a viewing context (glutCreateWindow()) then

  • GLenum err = glewInit();
    if (GLEW_OK != err)
    {
      /* Problem: glewInit failed, something is seriously wrong. */
      cerr << "Error: "  << glewGetErrorString(err) << endl;
      ...
    }
    cout << "Status: Using GLEW " <<  glewGetString(GLEW_VERSION) << endl;
    	

  • There are other query functions
  • You must then link with -lGLEW
  • And apparently some utilities as well.
  • visualinfo
  • glewinfo