int _glfwPlatformGetJoystickButtons( int joy, unsigned char *buttons,
int numbuttons )
{
int i;
// Is joystick present?
if( !_glfwJoy[ joy ].Present )
{
return 0;
}
// Update joystick state
_glfwPollJoystickEvents();
// Does the joystick support less buttons than requested?
if( _glfwJoy[ joy ].NumButtons < numbuttons )
{
numbuttons = _glfwJoy[ joy ].NumButtons;
}
// Copy button states from internal state
for( i = 0; i < numbuttons; ++ i )
{
buttons[ i ] = _glfwJoy[ joy ].Button[ i ];
}
return numbuttons;
}
int _glfwPlatformGetJoystickPos( int joy, float *pos, int numaxes )
{
int i;
// Is joystick present?
if( !_glfwJoy[ joy ].Present )
{
return 0;
}
// Update joystick state
_glfwPollJoystickEvents();
// Does the joystick support less axes than requested?
if( _glfwJoy[ joy ].NumAxes < numaxes )
{
numaxes = _glfwJoy[ joy ].NumAxes;
}
// Copy axis positions from internal state
for( i = 0; i < numaxes; ++ i )
{
pos[ i ] = _glfwJoy[ joy ].Axis[ i ];
}
return numaxes;
}
// Polls for and processes events the specified joystick
//
static GLFWbool pollJoystickEvents(_GLFWjoystickLinux* js)
{
#if defined(__linux__)
_glfwPollJoystickEvents();
if (!js->present)
return GLFW_FALSE;
// Read all queued events (non-blocking)
for (;;)
{
struct js_event e;
errno = 0;
if (read(js->fd, &e, sizeof(e)) < 0)
{
// Reset the joystick slot if the device was disconnected
if (errno == ENODEV)
{
free(js->axes);
free(js->buttons);
free(js->name);
free(js->path);
memset(js, 0, sizeof(_GLFWjoystickLinux));
_glfwInputJoystickChange(js - _glfw.linux_js.js,
GLFW_DISCONNECTED);
}
break;
}
// Clear the initial-state bit
e.type &= ~JS_EVENT_INIT;
if (e.type == JS_EVENT_AXIS)
js->axes[e.number] = (float) e.value / 32767.0f;
else if (e.type == JS_EVENT_BUTTON)
js->buttons[e.number] = e.value ? GLFW_PRESS : GLFW_RELEASE;
}
#endif // __linux__
return js->present;
}
