glutEnterGameMode(3GLUT)					       GLUT						  glutEnterGameMode(3GLUT)

NAME

       glutEnterGameMode, glutLeaveGameMode - enters and leaves GLUT's game mode.

SYNTAX

       void glutEnterGameMode(void);
       void glutLeaveGameMode(void);

DESCRIPTION

       glutEnterGameMode is designed to enable high-performance fullscreen GLUT rendering, possibly at a different screen display format.  Calling
       glutEnterGameMode creates a special fullscreen GLUT window (with its own callbacks and OpenGL rendering context state).	If the	game  mode
       string  describes  a  possible  screen  display	format,  GLUT also changes the screen display format to the one described by the game mode
       string.	glutLeaveGameMode leaves the GLUT game mode and returns the screen display format to its default format.

       When game mode is entered, certain GLUT functionality is disable to facilitate high-performance fullscreen rendering.   GLUT  pop-up  menus
       are  not available while in game mode.  Other created windows and subwindows are not displayed in GLUT game mode.  Game mode will also hide
       all other applications running on the computer's display screen.  The intent of these restrictions is to eliminate window clipping  issues,
       permit screen display format changes, and permit fullscreen rendering optimization such as page flipping for fullscreen buffer swaps.

       After  leaving  game mode, the GLUT functionality disabled in game mode is available again.  The game mode window (and its OpenGL rendering
       state) is destroyed when leaving game mode.  Any windows and subwindows created before entering the game mode are displayed in their previ-
       ous locations.  The OpenGL state of normal GLUT windows and subwindows is not disturbed by entering and/or leaving game mode.

       The  following  GLUT  routines are ignored in game mode:  glutFullScreen, glutSetWindowTitle, glutSetIconTitle, glutPositionWindow, glutRe-
       shapeWindow, glutPopWindow, glutPushWindow, glutIconifyWindow, glutShowWindow, glutHideWindow.

       glutEnterGameMode can be called when already in game mode.  This will destroy the previous game mode window (including any OpenGL rendering
       state)  and  create  a  new game mode window with a new OpenGL rendering context.  Also if glutEnterGameMode is called when already in game
       mode and if the game mode string has changed and describes a possible screen display format, the new screen display format takes effect.  A
       reshape callback is generated if the game mode window changes size due to a screen display format change.

       Re-entering  game  mode	provides a mechanism for changing the screen display format while already in game mode.  Note though that the game
       mode window's OpenGL state is lost in this process and the application is responsible for re-initializing the newly created game mode  win-
       dow OpenGL state when re-entering game mode.

       Game mode cannot be entered while pop-up menus are in use.

       Note  that the glutEnterGameMode and glutFullScreen routines operate differently.  glutFullScreen simply makes the current window match the
       size of the screen.  glutFullScreen does not change the screen display format and does not disable any GLUT features such as pop-up  menus;
       glutFullScreen  continues to operate in a "windowed" mode of operation.	glutEnterGameMode creates a new window style, possibly changes the
       screen display mode, limits GLUT functionality, and hides other applications.

SEE ALSO

       glutGameModeGet, glutGameModeString, glutInitDisplayString

AUTHOR

       Mark J. Kilgard (mjk@nvidia.com)

GLUT
									3.7						  glutEnterGameMode(3GLUT)