glutJoystickFunc.man
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- ."
- ." Copyright (c) Mark J. Kilgard, 1998.
- ."
- .TH glutJoystickFunc 3GLUT "3.7" "GLUT" "GLUT"
- .SH NAME
- glutJoystickFunc - sets the joystick callback for the current window.
- .SH SYNTAX
- .nf
- .LP
- void glutJoystickFunc(void (*func)(unsigned int buttonMask,
- int x, int y, int z), int pollInterval);
- .fi
- .SH ARGUMENTS
- .IP fIfuncfP 1i
- The new joystick callback function.
- .IP fIpollIntervalfP 1i
- Joystick polling interval in milliseconds.
- .SH DESCRIPTION
- glutJoystickFunc sets the joystick callback for the current window.
-
- The joystick callback is called either due to polling of the joystick
- at the uniform timer interval specified by pollInterval (in milliseconds) or
- in response to calling glutForceJoystickFunc. If the pollInterval is
- non-positive, no joystick polling is performed and the GLUT application
- must frequently (usually from an idle callback) call glutForceJoystickFunc.
-
- The joystick buttons are reported by the callback's buttonMask parameter.
- The constants GLUT_JOYSTICK_BUTTON_A (0x1), GLUT_JOYSTICK_BUTTON_B (0x2),
- GLUT_JOYSTICK_BUTTON_C (0x4), and GLUT_JOYSTICK_BUTTON_D (0x8) are provided
- for programming convience.
-
- The x, y, and z callback parameters report the X, Y, and Z axes of the
- joystick. The joystick is centered at (0,0,0). X, Y, and Z are
- scaled to range between -1000 and 1000. Moving the joystick left reports
- negative X; right reports positive X. Pulling the stick towards
- you reports negative Y; push the stick away from you reports positive Y.
- If the joystick has a third axis (rudder or up/down), down reports
- negative Z; up reports positive Z.
-
- Passing a NULL func to glutJoystickFunc
- disables the generation of joystick callbacks. Without a joystick
- callback registered, glutForceJoystickFunc does nothing.
-
- When a new window is created, no joystick callback is
- initially registered.
- .SH LIMITATIONS
- The GLUT joystick callback only reports the first 3 axes and 32 buttons.
- GLUT supports only a single joystick.
- .SH GLUT IMPLEMENTATION NOTES FOR X11
- The GLUT 3.7 implementation of GLUT for X11 supports the joystick API, but
- not joystick input. A future implementation of GLUT for X11 may
- add joystick support.
- .SH GLUT IMPLEMENTATION NOTES FOR WIN32
- The GLUT 3.7 implementation of GLUT for Win32 supports the joystick API
- and joystick input, but does so through the dated joySetCapture and
- joyGetPosEx Win32 Multimedia API. The GLUT 3.7 joystick support for
- Win32 has all the limitations of the Win32 Multimedia API joystick support.
- A future implementation of GLUT for Win32 may use DirectInput.
- .SH GLUT IMPLEMENTATION NOTES FOR NON-ANALOG JOYSTICKS
- If the connected joystick does not return (x,y,z) as a continuous range
- (for example, an 8 position Atari 2600 joystick), the implementation should
- report the most extreme (x,y,z) location. That is, if a 2D joystick is
- pushed to the upper left, report (-1000,1000,0).
- .SH SEE ALSO
- glutForceJoystickFunc, glutMotionFunc, glutMouseFunc, glutSpaceballButtonFunc, glutSpaceballMotionFunc, glutButtonBoxFunc, glutTabletButtonFunc, glutDeviceGet
- .SH AUTHOR
- Mark J. Kilgard (mjk@nvidia.com)