glutJoystickFunc(3GLUT) GLUT glutJoystickFunc(3GLUT)NAMEglutJoystickFunc - sets the joystick callback for the cur
rent window.
SYNTAX
void glutJoystickFunc(void (*func)(unsigned int buttonMask,
int x, int y, int z), int pollInterval);
ARGUMENTS
func The new joystick callback function.
pollInterval
Joystick polling interval in milliseconds.
DESCRIPTIONglutJoystickFunc sets the joystick callback for the cur
rent 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-posi
tive, no joystick polling is performed and the GLUT appli
cation must frequently (usually from an idle callback)
call glutForceJoystickFunc.
The joystick buttons are reported by the callback's but
tonMask parameter. The constants GLUT_JOYSTICK_BUTTON_A
(0x1), GLUT_JOYSTICK_BUTTON_B (0x2), GLUT_JOYSTICK_BUT
TON_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 gen
eration of joystick callbacks. Without a joystick call
back registered, glutForceJoystickFunc does nothing.
When a new window is created, no joystick callback is ini
tially registered.
LIMITATIONS
The GLUT joystick callback only reports the first 3 axes
and 32 buttons. GLUT supports only a single joystick.
GLUT IMPLEMENTATION NOTES FOR X11
The GLUT 3.7 implementation of GLUT for X11 supports the
GLUT 3.7 1
glutJoystickFunc(3GLUT) GLUT glutJoystickFunc(3GLUT)
joystick API, but not joystick input. A future implemen
tation of GLUT for X11 may add joystick support.
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 limi
tations of the Win32 Multimedia API joystick support. A
future implementation of GLUT for Win32 may use DirectIn
put.
SEE ALSO
glutForceJoystickFunc, glutMotionFunc, glutMouseFunc,
glutSpaceballButtonFunc, glutSpaceballMotionFunc, glutBut
tonBoxFunc, glutTabletButtonFunc, glutDeviceGet
AUTHOR
Mark J. Kilgard (mjk@nvidia.com)
GLUT 3.7 2
