// Get absolute value / limits
public static int GetAbs(int fd, EvdevAxis axis, out InputAbsInfo info)
{
info = default(InputAbsInfo);
unsafe
{
fixed(InputAbsInfo *pinfo = &info)
{
// EVIOCGABS(abs) = _IOR('E', 0x40 + (abs), struct input_absinfo)
uint ioctl = IOCreate(DirectionFlags.Read, (int)axis + 0x40, BlittableValueType <InputAbsInfo> .Stride);
int retval = Libc.ioctl(fd, ioctl, new IntPtr(pinfo));
return(retval);
}
}
}
// Get absolute value / limits
public static int GetAbs(int fd, EvdevAxis axis, out InputAbsInfo info)
{
info = default(InputAbsInfo);
unsafe
{
fixed(InputAbsInfo *pinfo = &info)
{
// EVIOCGABS(abs) = _IOR('E', 0x40 + (abs), struct input_absinfo)
var ioctl = IOCreate(DirectionFlags.Read, (int)axis + 0x40, Marshal.SizeOf <InputAbsInfo>());
var retval = Libc.ioctl(fd, ioctl, new IntPtr(pinfo));
return(retval);
}
}
}
private unsafe static void QueryCapabilities(LinuxJoystickDetails stick,
byte *axisbit, int axisbytes,
byte *keybit, int keybytes,
out int axes, out int buttons, out int hats)
{
// Note: since we are trying to be compatible with the SDL2 gamepad database,
// we have to match SDL2 behavior bug-for-bug. This means:
// HAT0-HAT3 are all reported as hats (even if the docs say that HAT1 and HAT2 can be analogue triggers)
// DPAD buttons are reported as buttons, not as hats (unlike Windows and Mac OS X)
axes = buttons = hats = 0;
for (EvdevAxis axis = 0; axis < EvdevAxis.CNT && (int)axis < axisbytes * 8; axis++)
{
InputAbsInfo info;
bool is_valid = true;
is_valid &= TestBit(axisbit, (int)axis);
is_valid &= Evdev.GetAbs(stick.FileDescriptor, axis, out info) >= 0;
if (is_valid)
{
if (axis >= EvdevAxis.HAT0X && axis <= EvdevAxis.HAT3Y)
{
// Analogue hat
stick.AxisMap.Add(axis, new AxisInfo
{
Axis = (int)(JoystickHat)hats++,
Info = info
});
}
else
{
// Regular axis
stick.AxisMap.Add(axis, new AxisInfo
{
Axis = axes++,
Info = info
});
}
}
}
for (EvdevButton button = 0; button < EvdevButton.Last && (int)button < keybytes * 8; button++)
{
if (TestBit(keybit, (int)button))
{
stick.ButtonMap.Add(button, buttons++);
}
}
}
// Get absolute value / limits
public static int GetAbs(int fd, EvdevAxis axis, out InputAbsInfo info)
{
info = default(InputAbsInfo);
unsafe
{
fixed (InputAbsInfo* pinfo = &info)
{
// EVIOCGABS(abs) = _IOR('E', 0x40 + (abs), struct input_absinfo)
uint ioctl = IOCreate(DirectionFlags.Read, (int)axis + 0x40, BlittableValueType<InputAbsInfo>.Stride);
int retval = Libc.ioctl(fd, ioctl, new IntPtr(pinfo));
return retval;
}
}
}
