glutJoystickFunc(3GLUT) GLUT glutJoystickFunc(3GLUT)NAMEglutJoystickFunc - sets the joystick callback for the current 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 current window.
The joystick callback is called either due to polling of the joystick
at the uniform timer interval specified by pollInterval (in millisec‐
onds) 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 parame‐
ter. The constants GLUT_JOYSTICK_BUTTON_A (0x1), GLUT_JOYSTICK_BUT‐
TON_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 neg‐
ative 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 neg‐
ative Z; up reports positive Z.
Passing a NULL func to glutJoystickFunc disables the generation of joy‐
stick callbacks. Without a joystick callback registered, glutForceJoy‐
stickFunc does nothing.
When a new window is created, no joystick callback is initially regis‐
tered.
LIMITATIONS
The GLUT joystick callback only reports the first 3 axes and 32 but‐
tons. GLUT supports only a single joystick.
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.
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 sup‐
port. A future implementation of GLUT for Win32 may use DirectInput.
SEE ALSO
glutForceJoystickFunc, glutMotionFunc, glutMouseFunc, glutSpaceballBut‐
tonFunc, glutSpaceballMotionFunc, glutButtonBoxFunc, glutTabletButton‐
Func, glutDeviceGet
AUTHOR
Mark J. Kilgard (mjk@nvidia.com)
GLUT 3.7 glutJoystickFunc(3GLUT)
