glutInit(3GLUT)                      GLUT                      glutInit(3GLUT)

       glutInit - initialize the GLUT library.

       void glutInit(int *argcp, char **argv);

       argcp     A pointer to the program's unmodified argc variable from
                 main.  Upon return, the value pointed to by argcp will be
                 updated, because glutInit extracts any command line options
                 intended for the GLUT library.

       argv      The program's unmodified argv variable from main. Like argcp,
                 the data for argv will be updated because glutInit extracts
                 any command line options understood by the GLUT library.

       glutInit will initialize the GLUT library and negotiate a session with
       the window system. During this process, glutInit may cause the
       termination of the GLUT program with an error message to the user if
       GLUT cannot be properly initialized.  Examples of this situation
       include the failure to connect to the window system, the lack of window
       system support for OpenGL, and invalid command line options.

       glutInit also processes command line options, but the specific options
       parse are window system dependent.

       The X Window System specific options parsed by glutInit are as follows:

       -display DISPLAY
               Specify the X server to connect to. If not specified, the value
               of the DISPLAY environment variable is used.

       -geometry WxH+X+Y
               Determines where window's should be created on the screen. The
               parameter following -geometry should be formatted as a standard
               X geometry specification.  The effect of using this option is
               to change the GLUT initial size and initial position the same
               as if glutInitWindowSize or glutInitWindowPosition were called

       -iconic Requests all top-level windows be created in an iconic state.

               Force the use of indirect OpenGL rendering contexts.

       -direct Force the use of direct OpenGL rendering contexts (not all GLX
               implementations support direct rendering contexts). A fatal
               error is generated if direct rendering is not supported by the
               OpenGL implementation.

               If neither -indirect or -direct are used to force a particular
               behavior, GLUT will attempt to use direct rendering if possible
               and otherwise fallback to indirect rendering.

               After processing callbacks and/or events, check if there are
               any OpenGL errors by calling glGetError.  If an error is
               reported, print out a warning by looking up the error code with
               gluErrorString.  Using this option is helpful in detecting
               OpenGL run-time errors.

       -sync   Enable synchronous X protocol transactions.  This option makes
               it easier to track down potential   X protocol errors.

       glutCreateWindow, glutInitWindowPosition, glutInitWindowSize,

       Mark J. Kilgard (

GLUT                                  3.7                      glutInit(3GLUT)